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Influence of Fabric Geometrical Structure on Bonding of the Fabric Reinforced Cement Composites 被引量:1
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作者 俞巧珍 《Journal of Donghua University(English Edition)》 EI CAS 2007年第6期765-770,共6页
Influence of fabric geometrical parameters,including the number of filling yarns per 10 cm,yarn twist and fiber type,on bonding of the fabric reinforced cement composites is studied by fabric pull-out test and SEM mic... Influence of fabric geometrical parameters,including the number of filling yarns per 10 cm,yarn twist and fiber type,on bonding of the fabric reinforced cement composites is studied by fabric pull-out test and SEM microstructure analysis.The results show that the bonding strength increase with the increase of the number of filling yarns per 10 cm in the range of this study.But the influence of fabric count on the interfacial bonding is dual and there is a critical value.The twist of yarns has a little effect on the bonding strength and interfacial bonding behaves of nylon fabric reinforced cement composites.There is an optimum twist range.Within this range,the bonding strength increase slowly with the increase of yarn twist.Beyond this range,it is versus.The bonding strength is strongly affected by the fabric character.The bonding between the nylon fiber fabric and cement is good;that of between glass fiber fabric and cement is moderate and that of between the carbon fiber fabric and cement is poor. 展开更多
关键词 fabric geometricul structure cement composites INTERFACE bonding strength
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Fracture Properties of Cement Composites Reinforced with Steel Polypropylene Hybrid Fibres
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作者 郭宏定 钱春香 PietStroeven 《Journal of Southeast University(English Edition)》 EI CAS 1999年第2期55-62,共8页
Polypropylene fibres and three sizes of steel fibres reinforced concrete are discussed. The total fibres content ranges from 0 4%-0 95% by volume of concrete. A four point bending test is adopted on the notched pris... Polypropylene fibres and three sizes of steel fibres reinforced concrete are discussed. The total fibres content ranges from 0 4%-0 95% by volume of concrete. A four point bending test is adopted on the notched prisms with the size of 100?mm×100?mm×500?mm to investigate the effect of hybrid fibres on crack arresting. The research results show that there is a positive synergy effect between large steel fibres and polypropylene fibres on the load bearing capacity in the small displacement range. But this synergy effect disappears in the large displacement range. The large and strong steel fibre is better than soft polypropylene fibre and small steel fibre in the aspect of energy absorption capacity in the large displacement range. The static usage limitation for the hybrid fibres concrete with “wide peak' or “multi peaks' load CMOD pattern should be carefully selected. The ultimate load bearing capacity and the crack width or CMOD at this load level should be jointly considered. 展开更多
关键词 polypropylene fibre steel fibre fracture properties low fibre content cement based composites
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Electrocaloric behavior of Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.88)Sn_(0.02)O_3 cement composites
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作者 P.SURESH P.MATHIYALAGAN K.S.SRIKANTH 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第4期791-798,共8页
A thrust for looking multifunctional materials for applications in civil engineering structures has attracted interest among researchers across the globe.Cement based Ba0.85Ca0.15Zr0.1Ti0.88Sn0.02O3(BCZT.Sn)composites... A thrust for looking multifunctional materials for applications in civil engineering structures has attracted interest among researchers across the globe.Cement based Ba0.85Ca0.15Zr0.1Ti0.88Sn0.02O3(BCZT.Sn)composites were prepared for electrocaloric applications with varying BCZT.Sn to cement ratio.Hysteresis loops showed some signature of saturation in cement composites.However,loops of pure sample were saturated due to its ferroelectric nature.Furthermore,these composites were explored for the first time in solid state refrigeration technology namely electrocaloric effect(ECE).Peak electrocaloric performance shows an adiabatic temperature changes of 0.71,0.64 and 0.50 K and isothermal entropy changes of 0.86,0.80 and 0.65 J/(kg.K)for BCZT.Sn,10%and 15%cement composites,respectively,under application of 0-29 kV/cm electric field.The adiabatic temperature change in cement based composites is comparable with that of the BCZT-Sn ferroelectric ceramics.Furthermore,the dielectric constant(εr)of composites with different ceramic contents at room temperature reveals that dielectric constant increases with an increase in BCZT-Sn proportion in composites.These cement based BCZT.Sn composite materials may be used in solid state refrigeration as they are fairly competitive with the pristine sample. 展开更多
关键词 electrocaloric behavior cement composites DIELECTRIC ENTROPY
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THE EFFECT OF POLYMER IN STEEL FIBER REINFORCED CEMENT COMPOSITES
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作者 吴少鹏 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1999年第3期23-27,52,共6页
Three kinds of polymers, polymethyl acrylate emulsion (POLYVINYLformal solution (PV- FO), styrene acrylate copolymer emulsion (SA)are chosen To study the effect of polymer in steel fiber rein forcedce- Ment composites... Three kinds of polymers, polymethyl acrylate emulsion (POLYVINYLformal solution (PV- FO), styrene acrylate copolymer emulsion (SA)are chosen To study the effect of polymer in steel fiber rein forcedce- Ment composites (SFRCC). The experimental results show That thebonding properties in SFRCC are remarkably im- Proved after theaddition of three kinds of polymer. 展开更多
关键词 POLYMER steel fiber reinforced cement composites effect mechanism
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Microstructure of a Planting Material Consisting of Nutrition-Expansive Perlitic-Cement Composites 被引量:2
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作者 张季如 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2003年第2期75-78,共4页
An ecotypic revetment material consisting of nutrition-expansive perlitic-cement composites is introduced. This planting material can combine vegetation recovery with slope protection. The XRD, SEM and image analysis ... An ecotypic revetment material consisting of nutrition-expansive perlitic-cement composites is introduced. This planting material can combine vegetation recovery with slope protection. The XRD, SEM and image analysis techniques were used to study its composition and microstructure. Its strength was measured by an electro-hydraulic servo-controlled testing machine. The results show the unconfined compressive strength is about 393.6 kPa, and the average elastic modulus is about 47.0 MPa. The quartz, felspar, chlorite and calcite are the main non-clay minerals in the planting material. Its particles are mainly spherical,and the range of the equivalent diameter is 1.83 to 15.96 μm. The results also show the planting material contains a large amount of micro non-capillary and capillary pores, and has a microstructure characteristic of honeycomb and coralline. CSH gel produced by hydration of cement increases the strength and water stability of the particles. The anisotropy and slight orientation of the particles increase the void cross-section area,providing an explanation of the high permeability for the planting material.The better porosity of the planting material is apt tokeep moisture and nutriment, provides oxygen for plant root breathing, and aids to exhaust the carbon dioxide by means of exchanging with atmosphere, hence it can facilitate vegetation. 展开更多
关键词 MICROSTRUCTURE planting material NUTRITION expansive perlitic cement composite
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INTERFACE AND PROPERTIES OF ALKALI-TREATED CARBON FIBRE REINFORCED CEMENT COMPOSITES
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作者 孙成林 闻荻江 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1993年第1期13-18,共6页
The surface of carbon fibre is studied which has been treated with heated sodium hydrate solution (NaOH) . It is found that the surface of carbon fibre is not corroded during the treatment. But at the same time, it is... The surface of carbon fibre is studied which has been treated with heated sodium hydrate solution (NaOH) . It is found that the surface of carbon fibre is not corroded during the treatment. But at the same time, it is also found that after this treatment, a certain number of carbonyl groups (C O) and (-COOH or ?COONa) are produced on the treated surface of carbon fibre. When carbon fiber is mixed with cement paste, the above reactive groups will link with Ca+2 in the paste, which will result in an early stage hydration of cement in inter facial areas. In addition, the experiments show that the rheological properties of cement paste reinforced with alkali-treated carbon fibre differ greatly from that of untreated carbon fibre reinforced cement paste. 展开更多
关键词 alkali-treated carbon fibre reinforced cement composite INTERFACE PROPERTY
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Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks 被引量:1
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作者 Maolin Tian Shaojie Chen +1 位作者 Lijun Han Hongtian Xiao 《Deep Underground Science and Engineering》 2024年第1期53-69,共17页
The fractured surrounding rocks of roadways pose major challenges to safe mining.Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks.The aim of ... The fractured surrounding rocks of roadways pose major challenges to safe mining.Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks.The aim of this study is to develop highly efficient composite ultrafine cement(CUC)grouts to reinforce the roadway in fractured surrounding rocks.The materials used are ultrafine cement(UC),ultrafine fly ash(UF),ultrafine slag(US),and additives(superplasticizer[SUP],aluminate ultrafine expansion agent[AUA],gypsum,and retarder).The fluidity,bleeding,shrinkage,setting time,chemical composition,microstructure,degree of hydration,and mechanical property of grouting materials were evaluated in this study.Also,a suitable and effective CUC grout mixture was used to reinforce the roadway in the fractured surrounding rock.The results have shown that the addition of UF and US reduces the plastic viscosity of CUC,and the best fluidity can be obtained by adding 40%UF and 10%US.Since UC and UF particles are small,the pozzolanic effect of UF promotes the hydration reaction,which is conductive to the stability of CUC grouts.In addition,fine particles of UC,UF,and US can effectively fill the pores,while the volumetric expansion of AUA and gypsum decreases the pores and thus affects the microstructure of the solidified grout.The compressive test results have shown that the addition of specific amounts of UF and US can ameliorate the mechanical properties of CUC grouts.Finally,the CUC22‐8 grout was used to reinforce the No.20322 belt roadway.The results of numerical simulation and field monitoring have indicated that grouting can efficaciously reinforce the surrounding rock of the roadway.In this research,high‐performance CUC grouts were developed for surrounding rock reinforcement of underground engineering by utilizing UC and some additives. 展开更多
关键词 broken surrounding rock composite ultrafine cement(CUC)grouts grouting material grouting performance grouting reinforcement
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Behavior of High Performance PVA Fiber Reinforced Cement Composites in Triaxial Compression 被引量:10
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作者 LI Y LIANG X W LIU Z J 《武汉理工大学学报》 CAS CSCD 北大核心 2010年第17期179-185,共7页
Based on an extensive experimental program,the paper studies the behavior of HPFRCC under triaxial compression. The experimental parameters are lateral confining pressure and PVA fiber content by volume. The test resu... Based on an extensive experimental program,the paper studies the behavior of HPFRCC under triaxial compression. The experimental parameters are lateral confining pressure and PVA fiber content by volume. The test results indicate that ultimate strength and peak strain are significantly improved with the increases of confining pressure. The confining effect introduced by the fibers becomes minor in triaxial compression tests,where there is relatively high external confining pressure. The axial stress-strain curves with different confining pressure and different PVA fiber content by volume are obtained. Lateral confining pressure constraints the lateral expansion of HPFRCC,so there is a big plastic deformation with its ultimate strength improved. At lower confining pressure,PVA fiber content by volume has some effect on the decreased section of stress-strain curve. According to test results,the paper establishes formula of confining pressure with ultimate strength and axial peak strain respectively. 展开更多
关键词 PVA high Performance fiber reinforced cement composites ultimate strength deformation property
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Review of recent developments in cement composites reinforced with fibers and nanomaterials 被引量:6
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作者 Jianzhuang XIAO Nv HAN +2 位作者 Yan LI Zhongsen ZHANG Surendra P.SHAH 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2021年第1期1-19,共19页
The quest for high-performance construction materials is led by the development and application of new reinforcement materials for cement composites.Concrete reinforcement with fibers has a long history.Nowadays,many ... The quest for high-performance construction materials is led by the development and application of new reinforcement materials for cement composites.Concrete reinforcement with fibers has a long history.Nowadays,many new fibers associated with high performance and possessing eco-environmental characteristics,such as basalt fibers and plant fibers,have received much attention from researchers.In addition,nanomaterials are considered as a core material in the modification of cement composites,specifically in the enhancement of the strength and durability of composites.This paper provides an overview of the recent research progress on cement composites reinforced with fibers and nanomaterials.The influences of fibers and nanomaterials on the fresh and hardened properties of cement composites are summarized.Moreover,future trends in the application of these fibers or of nanomaterial-reinforced cement composites are proposed. 展开更多
关键词 cement composites fiber NANOMATERIAL mechanical property DURABILITY
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Effect of Polyaniline/manganese Dioxide Composite on the Thermoelectric Effect of Cement-based Materials 被引量:1
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作者 季涛 LIAO Xiao +4 位作者 HE Yan 张士萍 ZHANG Xiaoying ZHANG Xiong LI Weihua 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第1期109-116,共8页
To enhance the thermoelectric effect of cement-based materials,conductive polyaniline(PANI)modified MnO_(2)powder was synthesized and used as a thermoelectric component in the cement composites.The nanostructured PANI... To enhance the thermoelectric effect of cement-based materials,conductive polyaniline(PANI)modified MnO_(2)powder was synthesized and used as a thermoelectric component in the cement composites.The nanostructured PANI was deposited on the surface of the nanorod-shapedα-MnO_(2)particle and the weight ratio of PANI to MnO_(2)was 22.3:77.7 in the composite.The synthesized PANI/MnO_(2)composite was nanostructured according to the SEM image.The test results of the thermoelectric properties proved that the PANI/MnO_(2)composite was effective as the Seebeck coefficient and electrical conductivity values of the cement composites with PANI/MnO_(2)inside were 3-4 orders of magnitude higher than those of pure cement paste and the thermal conductivity values of these cement samples were similar.The obtained maximum figure of merit(ZT)value(2.75×10^(-3))was much larger than that of conductive materials reinforced cement-based composites.The thermoelectric effect of cement composites is mainly enhanced by the increased Seebeck coefficient and electrical conductivity in this work. 展开更多
关键词 PANI/MnO_(2)composite cement composites thermoelectric effect Seebeck coefficient electrical conductivity
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Improvement of Water Sensitivity of Macro-defect-free Cement Based Composites with Cross Coupling Agent 被引量:1
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作者 李北星 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2001年第2期25-30,共6页
The enhancement of interface bonding between cement and polymerand the structural reticula- tion of the water-soluble polymer areproposed to minimize the shortening of the mechanical properties ofmacro-de- fect-free(M... The enhancement of interface bonding between cement and polymerand the structural reticula- tion of the water-soluble polymer areproposed to minimize the shortening of the mechanical properties ofmacro-de- fect-free(MDF)cement based composites at high relativehumidity. The MDF composites incorporated with vari- ouscross-coupling agents studied experimentally. The results show thatthe MDF composites modified with small amounts of cross-couplingagent had raised mechanical properties, but it is more important thatthe modified MDF composites had a significant increase in waterresistance compared to the original one. 展开更多
关键词 macro-defect-free(MDF)cement based composites cross-coupling agent α-alumina
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Influence of Bayer Red Mud on the Operational and Mechanical Characteristics of Composite Cement Mortar
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作者 Cheng Hu Weiheng Xiang +6 位作者 Ping Chen Yi Yang Libo Zhou Jiufang Jiang Shunkai Li Yang Ming Qing Li 《Journal of Renewable Materials》 EI 2023年第11期3945-3956,共12页
The aim of this study is to enhance the value and utilization of red mud generated in the Bayer process by preparing composite cement mortars.The effects of two different types of Bayer red mud with varying physical a... The aim of this study is to enhance the value and utilization of red mud generated in the Bayer process by preparing composite cement mortars.The effects of two different types of Bayer red mud with varying physical and chemical characteristics on the fluidity,mechanical strength,mineral composition,and microstructure of the composite cement mortar were systematically evaluated.The results showed that the optimal addition of red mud A was 10 wt%,while it was 20 wt% for red mud B.The mechanical properties of the composite cement mortar met the standards for P·O42.5 cement.Furthermore,the composite mortar with the addition of red mud B showed higher flexural and compressive strengths compared to the composite mortar with red mud A.This improvement is attributed to the smaller particle size of red mud B,which filled the micro-pores and increased the compactness of the cement stone,as well as its higher content of Na_(2)O,K_(2)O,and other free alkalis,which resulted in more obvious alkali activation,accelerating the hydration of the active minerals in the slurry. 展开更多
关键词 Bayer red mud composite cement mortar FLUIDITY mechanical strength MICROSTRUCTURE
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Effects of Fiber Distribution and Content on Performance of Engineered Cementitious Composite (ECC) 被引量:1
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作者 GUO Xiaolu WANG Sijia ZHANG Hongmei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2021年第4期569-577,共9页
The 21 dog-bone specimens with different fiber contents and fiber distribution (random chopped fiber or directional continuous filament fiber bundles) were designed and tested under uniaxial tension using domestic PVA... The 21 dog-bone specimens with different fiber contents and fiber distribution (random chopped fiber or directional continuous filament fiber bundles) were designed and tested under uniaxial tension using domestic PVA (polyvinyl alcohol) fiber.High fiber content exerted positive influences on cracking stress,peak stress and deformation capacity of specimens with random chopped fiber,compared with the decrease shown in cracking stress of specimens containing directional fiber bundles.There were multiple cracks in specimens containing directional fiber bundles,while only 1-2 typical cracks could be shown in chopped fiber specimens after being broken.Random chopped fiber connected more closely with matrix compared with that only part of fiber bundles could contact with matrix.Double-fold line model and parabolic model could be used simultaneously to fit well with the uniaxial tension constitutive relations of engineered cementitious composite (ECC).Although the performance of PVA produced in China can not reach to the same level of those from Japan,there exists certain practical value in engineering according to its contribution to deformability of structure. 展开更多
关键词 fiber reinforced cement composites fiber produced in China fiber distribution MICRO-MORPHOLOGY constitutive relation
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Preparation of Super Composite Cement with a Lower Clinker Content and a Larger Amount of Industrial Wastes 被引量:7
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作者 何真 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2002年第4期78-81,共4页
The effects of the grinding mode,fineness,gypsum kinds and dosage,mix proportions on properties of the composite cements consisting of slag,fly ash,limestone and a lower content clinker were investigated,respectively.... The effects of the grinding mode,fineness,gypsum kinds and dosage,mix proportions on properties of the composite cements consisting of slag,fly ash,limestone and a lower content clinker were investigated,respectively.The results show that when the proportions among slag,fly ash and limestone are appropriate,the grinding technology and system are reasonable,the optimized gypsums and additives are effective,the 52.5R grade cement (52.5R grade cement means a higher strength than 52.5 at early age) can be prepared by clinker dosage of 50% in weight,the 42.5R or 42.5,32.5 grade composite cement containing 40% and 30% clinker also may be made, respectively.Moreover,the high performance concrete prepared from the above composite cements was studied experimentally. 展开更多
关键词 industrial wastes super composite cement high performance concrete PROPERTIES
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Microstructure and Mechanical Properties of CaCO_3 Whisker-reinforced Cement 被引量:11
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作者 曹明莉 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第5期1004-1009,共6页
Composite Portland cement (PC) played an important role in various kinds of construction engineering owing to low hydration heat,low-cost,and application of solid industrial waste,but its brittleness and low strengt... Composite Portland cement (PC) played an important role in various kinds of construction engineering owing to low hydration heat,low-cost,and application of solid industrial waste,but its brittleness and low strength limited its use in stress-bearing locations.The aim of this study is to improve the toughness and fracture resistance by incorporating CaCO3 whisker in cement matrix.Effect of different content of calcium carbonate whiskers on the mechanical properties of PC was investigated.The results showed that the flexural strength,impact strength and split tensile strength were increased by 39.7%,39.25% and 36.34% at maximum,respectively.Microstructure and elements of the whiskers in hardened cement were observed and analyzed by SEM/EDS.The mechanisms of the reinforcement of CaCO3 whisker on cement were also discussed,and the conclusion was that the improvement could be correlated to energy-dissipating processes owing to crack bridging,crack deflection,and whisker pull-out at the crack tips. 展开更多
关键词 CaCO3 whiskers reinforcement composite Portland cement mechanical properties microstructure toughening mechanism
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Development of the nano-composite cement:Application in regulating grouting in complex ground conditions 被引量:3
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作者 WANG Sheng WANG Jing-fei +3 位作者 YUAN Chao-peng CHEN Li-yi XU Shi-tong GUO Kai-bin 《Journal of Mountain Science》 SCIE CSCD 2018年第7期1572-1584,共13页
Improvement of the fluidity and setting time of grouting materials has been recognized as an effective approach of seepage prevention in foundation works, and it is quite common to be used for handling severe leakages... Improvement of the fluidity and setting time of grouting materials has been recognized as an effective approach of seepage prevention in foundation works, and it is quite common to be used for handling severe leakages in complex ground conditions, such as loose, broken and fully fissured stratum. For the purposed of better meeting the engineering requirements, experimental studies were conducted in this study with focus on the nanocomposite grouting materials and the related controlled grouting technology. As compared with the commonly used silicate-sulpho-aluminate composite cement, which is characterized by relatively poor rheological property, quick setting time and low strength, the most suitable nano-material with proper reactants were selected intentionally to improve the mentioned attributes of composite cement. Due to the setting time and strength of the targeted cement slurry behaving with poor performance of harmonization to engineering construction problems, hydration synergistic effect of these composites were investigated in our experiments. Results showed that the properties of grouting materials, including initial fluidity, setting time, ideal right-angle thickening, and early strength and late strength were sufficient to produce an expected grouting application. It is therefore advocated that the refined grouting material could provide a better solution to fix grouting problems in complex ground cementing operations. 展开更多
关键词 NANO-SILICA Silicate-sulpho-aluminate composite cement grout Controlled grouting Complex ground conditions
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Beneficial use of stainless steel EAF slag as composite cement admixture and its heavy metals leaching risk analysis 被引量:3
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作者 WANG Ruyi CHEN Ronghuan SHI Lei 《Baosteel Technical Research》 CAS 2009年第4期14-18,共5页
This study analyzes the feasibility of using stainless steel electric arc furnace (EAF) slag as composite cement admixture and the risk of leaching-out of heavy metals. The results show that the stainless steel EAF ... This study analyzes the feasibility of using stainless steel electric arc furnace (EAF) slag as composite cement admixture and the risk of leaching-out of heavy metals. The results show that the stainless steel EAF slag, mainly made up of Ca2 SiO4, Ca3 Mg ( SiO4 ) 2, some Cr-containing minerals and in small particle size, is easily ground and has cementitious activity. EAF slag, when used as cement admixture, can be added with a maximum percentage of 32%. It can meet the strength requirements of the standard P · C 32.5 cement. When the mixing percentage is decreased to 25 % , the strength of the cement can be increased to that of P · C 42.5 cement. Other main quality indexes of composite cement, such as the setting time and stability, also satisfy standard requirements. The results also show that most of the heavy metals in the stainless steel EAF slag exist in a stable speciation. The concentration of heavy metals that leach out from the stainless steel EAF slag and the composite cement products is far lower than the standard limit of hazardous wastes. The main heavy metal, chromium, exists as less hazardous trivalent chromium. Therefore, the risk of heavy metals leaching out from the stainless steel EAF slag is low. The internal exposure index (IRa) and the external exposure index (Iγ) of the stainless steel EAF slag are both lower than 1.0, satisfying the standard requirements of the state for the radionuclides of building materials. Therefore, stainless steel EAF slag can be safely used as admixture to produce composite cement. 展开更多
关键词 stainless steel EAF slag composite cement ADMIXTURE heavy metal risk of leaching out
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Multifunctional, Sustainable, and Biological Non-Ureolytic Self-Healing Systems for Cement-Based Materials 被引量:1
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作者 Mohammad Fahimizadeh Pooria Pasbakhsh +2 位作者 Lee Sui Mae Joash Ban Lee Tan R.K.Singh Raman 《Engineering》 SCIE EI CAS 2022年第6期217-237,共21页
Microbially induced calcium carbonate(CaCO_(3))precipitation(MICP)has been investigated as a sustain-able alternative to conventional concrete remediation methods for improving the mechanical properties and durability... Microbially induced calcium carbonate(CaCO_(3))precipitation(MICP)has been investigated as a sustain-able alternative to conventional concrete remediation methods for improving the mechanical properties and durability of concrete structures.To date,urea-dependent MICP is the most widely employed MICP pathway in biological self-healing concrete research as its use has resulted in efficient CaCO_(3) precipita-tion rates.NH_(3) is a byproduct of ureolysis,and can be hazardous to cementitious structures and the health of various species.Accordingly,non-ureolytic bacterial concrete self-healing systems have been developed as eco-friendly alternatives to urea-dependent self-healing systems.Non-ureolytic pathways can improve the physical properties of concrete samples and incorporate the use of waste materials;they have the potential to be cost-effective and sustainable.Moreover,they can be applied in terrestrial and marine environments.To date,research on non-ureolytic concrete self-healing systems has been scarce compared to that on ureolytic systems.This article discusses the advances and challenges in non-ureolytic bacterial concrete self-healing studies and highlights the directions for future research. 展开更多
关键词 Self-healing concrete Mechanical properties Durability Non-ureolytic pathways cement composite Sustainability
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The Smart Behavior of Cement-based Composite Containing Carbon Fibers under Three-point-bending Load 被引量:1
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作者 陈兵 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第4期128-131,共4页
The influences of the fiber volume fraction on the electrical conductivity and the fraction change of electrical resistance under three-point-bending test were discussed.It is found that the relationship beween the el... The influences of the fiber volume fraction on the electrical conductivity and the fraction change of electrical resistance under three-point-bending test were discussed.It is found that the relationship beween the electrical conductivity of composites and the fiber volume fraction can be explained by the percolation theory and the change of electrical resistance of specimens reflects to the process of loading.The sensitivity and the response of the change of electrical resistance to the load for specimens with different fiber volume fractions are quite different.which provide an important guide for the manufacture of conductive and intrinsically smart carbon fiber composite. 展开更多
关键词 carbon fiber cement composite electrical conductivity smart behavior
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DEVELOPING A NEW GENERATION OF HIGH PERFORMANCE COMPOSITE CEMENT 被引量:1
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作者 黄新 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2000年第3期73-78,共6页
This paper proposed a new generation of high performance composite cement which is designed according to the optimization of composition and structure of cement paste and is manufactured by blending the differ ent com... This paper proposed a new generation of high performance composite cement which is designed according to the optimization of composition and structure of cement paste and is manufactured by blending the differ ent components with special composite techniques. Each of these components has its different special property, and should be compatible with each other and match each other, and the properties of them are complementary mutually. At present, such kind of high performance composite cement can be manufactured with high reactivity cement clinker, ground granulated blast - furnace slag, high grade fly ash, silica fume etc.. 展开更多
关键词 composite cement optimization of composition and structure DESIGN MANUFACTURE
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