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Experimental Study of Moso Bamboo to-Steel Connections with Embedded Grouting Materials
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作者 Shidong Nie Wei Fu +3 位作者 Hui Wang Di Wu Min Liu Junlong Wang 《Journal of Renewable Materials》 SCIE EI 2023年第3期1401-1423,共23页
Moso bamboos have attracted excessive attention as a renewable green building material to the concept of sustainable development.In this paper,the 20 bolted Moso bamboo connection specimens with embedded steel plates ... Moso bamboos have attracted excessive attention as a renewable green building material to the concept of sustainable development.In this paper,the 20 bolted Moso bamboo connection specimens with embedded steel plates and grouting materials were designed according to connection configurations with different bolt diameters and end distance of bolt holes,and their bearing capacities and failure modes were analyzed by static tension tests.According to the test results of all connectors,the failure modes of the specimens are divided into four categories,and the effects of bolt diameter and bolt hole end distance on the connection bearing capacity and failure mode are analyzed.The test results show that the deformation and failure process can be divided into four stages.The main influence factor of connector bearing capacity is bolt diameter.Connectors can be divided into four failure modes,and brittle failure can be avoided by adopting certain structural measures.Filling with grouting material can improve the bearing capacity of joints.Due to the large variability of bamboo,further experiments are needed. 展开更多
关键词 Moso bamboo connections embedded steel plates grouting materials bearing capacities failure modes
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Experimental Study on Ratio and Performance of Coal Gangue/Bottom Ash Geopolymer Double-Liquid Grouting Material
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作者 Wenqi Zhao Wenbin Sun +1 位作者 Zhenbo Cao Jianbang Hao 《Journal of Renewable Materials》 EI 2023年第7期3073-3089,共17页
Mine grouting reinforcement and water plugging projects often require large amounts of grouting materials.To reduce the carbon emission of grouting material production,improve the utilization of solid waste from minin... Mine grouting reinforcement and water plugging projects often require large amounts of grouting materials.To reduce the carbon emission of grouting material production,improve the utilization of solid waste from mining enterprises,and meet the needs of mine reinforcement and seepage control,a double-liquid grouting material containing a high admixture of coal gangue powder/bottom ash geopolymer was studied.The setting time,fluidity,bleeding rate,and mechanical properties of grouting materials were studied through laboratory tests,and SEM analyzed the microstructure of the materials.The results show that the total mixture of calcined gangue does not exceed 60%.And the proportion of bottom ash replacing cement should be within 30%.At the same time,the volume mixture of sodium silicate is 20%.And the water-solid ratio does not exceed 0.6.The stability of the slurry prepared under this ratio is good.The microstructure of the stone body is dense,and its strength can meet the requirements of rock reinforcement and seepage control.Its economic and environmental benefits are more significant than the traditional cement-silicate double-liquid grouting material. 展开更多
关键词 Coal gangue municipal solid waste sodium silicate double liquid grouting material
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Mechanical properties of anti-seepage grouting materials for heavy metal contaminated soil 被引量:3
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作者 杨宇友 王建强 豆海军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第10期3316-3323,共8页
Cement-based composite grouting materials were used to construct grouting cutoff wall for heavy metal contaminated soil in non-ferrous metal mining areas. Cement, fly ash, and slag as principal ingredients were mixed ... Cement-based composite grouting materials were used to construct grouting cutoff wall for heavy metal contaminated soil in non-ferrous metal mining areas. Cement, fly ash, and slag as principal ingredients were mixed with water glass in different ways to produce three composite grouting materials. In order to investigate the effect of water glass mixing ratio, Baume degree, fly ash and slag contents on the mechanical properties of the composite grouting materials, particularly their gel time and compressive strength, the beaker-to-beaker method of gel time test and unconfined compressive strength test were conducted. In addition, the phase composition and microstructure of the composite grouting materials were analyzed by the X-ray diffraction(XRD) and scanning electron microscope(SEM) techniques. The test results show that their gel time increases when water glass mixing ratio and Baume degree increase. The gel time increases dramatically when fly ash is added, but decreases slightly if fly ash is partly replaced by slag. When the mixing ratio of water glass is below 20%, their compressive strength increases with the increases of the ratio; when the ratio is above 20%, it significantly decreases. The compressive strength also tends to increase as Baume degree increases, and improves if fly ash and slag are added. 展开更多
关键词 heavy metal contaminated soil composite grouting material gel time compressive strength MICROSTRUCTURE
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Compressive Strength of Polymer Grouting Material at Different Temperatures 被引量:9
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作者 石明生 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第6期962-965,共4页
In order to study the influence of temperature on compressive strength of polymer grouting material,the compression specimen injection mold is self-made,and the uniaxial compressive test was carried out in the tempera... In order to study the influence of temperature on compressive strength of polymer grouting material,the compression specimen injection mold is self-made,and the uniaxial compressive test was carried out in the temperature control box under different temperatures.The change regularity of compressive strength of polymer grouting material under different temperatures and the law of volume changes of polymer samples were obtained.The experimental results show that:the compressive strength of polymer material increases with the increase of density;the temperature change has a certain influence on the compressive strength of polymer grouting material;the compressive strength decreases with temperature increases under the same density,but the compressive strength is not significantly affected by temperature when the density is less than 0.4 g/cm3;the volume change of the samples accords with the law of thermal expansion and contraction when temperature changes,and the increase of the volume is obvious when it is under high temperature.The achievements will provide an important basis to the application of the polymer grouting material. 展开更多
关键词 polymer grouting material compressive strength DENSITY TEMPERATURE VOLUME
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A new clay-cement composite grouting material for tunnelling in underwater karst area 被引量:10
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作者 ZHANG Cong YANG Jun-sheng +4 位作者 FU Jin-yang OU Xue-feng XIE Yi-peng DAI Yong LEI Jin-shan 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第7期1863-1873,共11页
A new clay-cement composite grouting material (CCGM) for tunnelling in underwater karst area was developed through the excellent synergistic interactions among cement, clay, meta-aluminate and lignin. The probable for... A new clay-cement composite grouting material (CCGM) for tunnelling in underwater karst area was developed through the excellent synergistic interactions among cement, clay, meta-aluminate and lignin. The probable formation mechanism of the material was proposed based on a series of experimental tests. The results show that with an optimal mass ratio (2:1:1:0.024) for water, cement, clay and additives, the obtained CCGM displayed an excellent grouting performance for karst in an underwater condition. Compared with neat cement grouts and clay-cement grouts, CCGM has faster gel time, lower bleeding rate and bulk shrinkage rate, greater initial viscosity, and a strong resistance to water dispersion. A successful engineering application indicates that CCGM not only fulfils a better grouting performance for karst in underwater conditions but also reduces the engineering cost and environmental pollution. 展开更多
关键词 tunnel karst UNDERWATER new grouting material clay-cement composite
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Super-absorbent swellable polymer as grouting material for treatment of karst water inrush 被引量:5
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作者 Shucai Li Chenyang Ma +5 位作者 Rentai Liu Mengjun Chen Jia Yan Zhenjun Wang Shaolong Duan Huasheng Zhang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2021年第5期753-763,共11页
Grouting is the most commonly used method to control water inrush in underground engineering.Traditional cement-based materials are easy to dilute and hard to coagulate under the influence of large flow and high-veloc... Grouting is the most commonly used method to control water inrush in underground engineering.Traditional cement-based materials are easy to dilute and hard to coagulate under the influence of large flow and high-velocity water inrush.To address these deficiencies,a new type of polymer grouting material with an excellent expansion ratio was synthesised.The material quickly absorbs water and has an expansion ratio of 1:300.The material is composed of a superabsorbent polymer(SAP),glycerol,and ethanol.The effects of water quality on the expansion ratio and expansion rate of the material were examined,and the best solid–liquid ratio for the slurry was determined by fluidity measurements.A karst specially designed pipeline water inrush test device showed that 800 g of SAP can achieve 0.6 m/s water flow blockage in the smooth pipeline,demonstrating that the ability of the SAP slurry to block water inrush is superior to those of other materials.This study provides a reference for water inrush plugging,and has important implications for the reduction and control of karst pipeline-type water inrush disasters,ensuring the safety of construction sites and preventing loss of life and damage to property. 展开更多
关键词 KARST Water inrush Model test grouting material Superabsorbent polymer
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Properties and Hydration Mechanism on High-strength Anchorage Grouting Material for Highway Slope 被引量:2
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作者 TANG Hua LI Xiangguo +3 位作者 ZHANG Fachun HE Chao TAN Hongbo FANG Rui 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第6期1181-1185,共5页
The rheological and mechanical properties of high-strength anchorage grouting materials for highway slope were investigated to optimize the mix proportion. The experimental results showed that the optimized mix propor... The rheological and mechanical properties of high-strength anchorage grouting materials for highway slope were investigated to optimize the mix proportion. The experimental results showed that the optimized mix proportion of high-strength anchorage grouting material (HAGM) was C3 (FA:SP-SF= 1:2:2; AGI:AG2=3:7 and 0.03% FC), which is agreement with the limitation of JCT 986-2005. Moreover, the XRD and FTIR results showed the addition of expansive components was in favor of the formation of ettringite. The intensity of AFt oeak of the samnles increased with the increasing of hydration time. 展开更多
关键词 grouting material FLUIDITY STRENGTH HYDRATION SLOPE
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Preparation and Performance Research of Cement-based Grouting Materials with High Early Strength and Expansion 被引量:6
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作者 张毅 LI Wei 李东旭 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第5期1115-1118,共4页
Main performance of the cement grouting materials made up by Portland cement(PC) and sulphoaluminate cement(SAC) was investigated in this program, a kind of expanding agent(EA) which was mainly constituted by me... Main performance of the cement grouting materials made up by Portland cement(PC) and sulphoaluminate cement(SAC) was investigated in this program, a kind of expanding agent(EA) which was mainly constituted by metakaolin and alunite was utilized for the compensation of the shrinkage, the hydration products and micro structure of the grouting materials were researched by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The results showed that a high expansion rate of the grouting materials could be reached as the expanding agent mixed in 6% of PC mass; the addition of SAC in the S2(PC:SAC:EA=34:6:2.25) brought a further improvement of the expansion rate of the grouting materials, the analysis of XRD and SEM showed that due to the reaction of expanding agent and SAC in the grouting materials, more ettringite crystal was generated, which resulted in a higher early strength, the addition of SAC played an expansion and strength reinforcement role in the grouting materials. 展开更多
关键词 grouting materials expanding agent sulphoaluminate cement hydration products performance research
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Macroscopic and microscopic trans-scale characteristics of pore structure of mine grouting materials 被引量:2
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作者 Jian-hua HU Qi-fan REN +4 位作者 Shao-wei MA Quan JIANG Yuan-jian JIANG Jun-long SHANG Zhou-quan LUO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第5期1067-1081,共15页
The pore structure and porosity of three kinds of mine grouting materials were characterized based on a thin-section analysis and low-field nuclear magnetic resonance (NMR) technique. The macroscopic pore interconnect... The pore structure and porosity of three kinds of mine grouting materials were characterized based on a thin-section analysis and low-field nuclear magnetic resonance (NMR) technique. The macroscopic pore interconnectivity was investigated using binary images captured from thin sections and a random walk pore spectral dimension (RWPSD) algorithm. The experimental results show that the microstructure of the grouting materials used consisted of interlayer pores, gel pores, capillary pores, circular air holes, and small fractures, and tailings can fill some gaps in the hydration product structure and dense hydration products. There is a positive correlation between pore interconnectivity and curing time. In addition, there is a relationship between pore interconnectivity and porosity. With increasing porosity and pore interconnectivity, a non-uniform pore structure occurs in mine grouting materials with an accelerator and results in reduced setting time and later strength. 展开更多
关键词 grouting material pore microstructure pore interconnectivity trans-scale study nuclear magnetic resonance thin-section analysis random walk pore spectral dimension
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Experimental Evaluation of Thermal Properties of Grouting Materials
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作者 Manuela Campanale Marta Deganello Lorenzo Moro 《Journal of Energy and Power Engineering》 2013年第8期1457-1463,共7页
This study is aimed at the thermal analysis of sealant mortar (usually a mixtures of bentonite and cemem with addition of sand) used in geothermal cooling and heating. In particular, thermal conductivity and diffusi... This study is aimed at the thermal analysis of sealant mortar (usually a mixtures of bentonite and cemem with addition of sand) used in geothermal cooling and heating. In particular, thermal conductivity and diffusivity measurements were performed on differem sealant mixtures by using Hot Disk thermal constants analyzer in order to identify the interesting thermal properties of grouting materials. The grouting materials that we considered are of porous nature and, if used in the presence of groundwater, have different levels of imbibitions. It is important to know the thermal behavior of these materials at different water content. A first set of measurements was performed on a not-tinted material at room temperature; then the samples were led to saturation conditions by contact capillary imbibitions with a cotton wool layer moistened in water. The determination of thermal conductivity in these test conditions appears to be critical compared to the measuremems on non-timed sample. The thermal conductivity tests have revealed how the thermal behavior of the samples analyzed is essentially determined by the density and water content of the material: in fact, the thermal conductivity increases of two to three times the value of the not-tinted material. 展开更多
关键词 Geothermal energy thermal conductivity sealant mortar hot disk grouting materials Portland cement mortar.
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Grouting theories and technologies for the reinforcement of fractured rocks surrounding deep roadways 被引量:2
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作者 Hongpu Kang Wenzhou Li +1 位作者 Fuqiang Gao Jianwei Yang 《Deep Underground Science and Engineering》 2023年第1期2-19,共18页
Grouting is an effective method to improve the integrity and stability of fractured rocks that surround deep roadways.After years of research and practice,various theories and a complete set of grouting technologies f... Grouting is an effective method to improve the integrity and stability of fractured rocks that surround deep roadways.After years of research and practice,various theories and a complete set of grouting technologies for deep roadways with fractured rocks have been developed and are widely applied in Chinese coal mining production.This paper systematically summarizes and analyzes the research results concerning the theory,design,materials,processes,and equipment for the grouting and reinforcement of fractured rocks surrounding deep roadways.Specifically,in terms of grouting methods,pregrouting,groutingwhile-excavation,and postgrouting methods are explored;in terms of grouting theory,backfill grouting,compaction grouting,infiltration grouting,and fracture grouting theories are studied.In addition,this paper also studies grouting borehole arrangement,water-cement ratio,grouting pressure,grouting volume,grout diffusion radius,and other grouting parameters and their determination methods.On this basis,this paper explores the physical and mechanical properties of organic and organic-inorganic composite grouting materials,and assess grouting reinforcement quality testing methods and instruments.Taken as the field cases,the application of pregrouting in front of heading faces,groutingwhile-excavation,and postgrouting in the Kouzidong coal mine are then introduced,and the effects of the grouting reinforcements are evaluated.This paper proposes a development direction for grouting technology based on problems existing in the grouting reinforcement of fractured rocks surrounding deep roadways. 展开更多
关键词 deep roadways development direction field study fractured rocks grouting materials grouting methods high-pressure grouting
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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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Theory,technology and application of grouted bolting in soft rock roadways of deep coal mines
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作者 Hongpu Kang Jianwei Yang +4 位作者 Pengfei Jiang Fuqiang Gao Wenzhou Li Jiafeng Li Huiyuan Chen 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第7期1463-1479,共17页
The grouted bolt,combining rock bolting with grouting techniques,provides an effective solution for controlling the surrounding rock in deep soft rock and fractured roadways.It has been extensively applied in numerous... The grouted bolt,combining rock bolting with grouting techniques,provides an effective solution for controlling the surrounding rock in deep soft rock and fractured roadways.It has been extensively applied in numerous deep mining areas characterized by soft rock roadways,where it has demonstrated remarkable control results.This article systematically explores the evolution of grouted bolting,covering its theoretical foundations,design methods,materials,construction processes,monitoring measures,and methods for assessing its effectiveness.The overview encompassed several key elements,delving into anchoring theory and grouting reinforcement theory.The new principle of high pretensioned high-pressure splitting grouted bolting collaborative active control is introduced.A fresh method for dynamic information design is also highlighted.The discussion touches on both conventional grouting rock bolts and cable bolts,as well as innovative grouted rock bolts and cables characterized by their high pretension,strength,and sealing hole pressure.An examination of the merits and demerits of standard inorganic and organic grouting materials versus the new inorganic–organic composite materials,including their specific application conditions,was conducted.Additionally,the article presents various methods and instruments to assess the support effect of grouting rock bolts,cable bolts,and grouting reinforcement.Furthermore,it provides a foundation for understanding the factors influencing decisions on grouted bolting timing,the sequence of grouting,the pressure applied,the volume of grout used,and the strategic arrangement of grouted rock bolts and cable bolts.The application of the high pretensioned high-pressure splitting grouted bolting collaborative control technology in a typical kilometer-deep soft rock mine in China—the soft coal seam and soft rock roadway in the Kouzidong coal mine,Huainan coal mining area,was introduced.Finally,the existing problems in grouted bolting control technology for deep soft rock roadways are analyzed,and the future development trend of grouted bolting control technology is anticipated. 展开更多
关键词 deep coal mine soft rock roadway grouted bolting rock bolt and cable grouting material high-pressure splitting grouting collaborative control technology
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Research on rheological properties of micro-fine grouting cement 被引量:3
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作者 管学茂 王雨利 杨雷 《Journal of Coal Science & Engineering(China)》 2003年第1期67-72,共6页
This article studies the influence of the fineness of cement, fly ash(FA), its composite admixture and the amount and way mixed with superplasticizer on the rheological properties of micro fine cement(MC). By means of... This article studies the influence of the fineness of cement, fly ash(FA), its composite admixture and the amount and way mixed with superplasticizer on the rheological properties of micro fine cement(MC). By means of modern instruments and technologies (such as XRD, SEM, laser granulometer and superficial potential apparatus etc.), the article studies the mineral compositions, the appearance character of grains, particle size distribution and superficial potential of FA and its composite materials. And through that, the reducing mechanism of FA is thoroughly analyzed. The study shows that FA and its composite admixture are excellent components which can effectively improve the rheological properties of micro fine cement, and that the superplasticizer has a saturation point and the mixing way of it has a great influence on the rheological properties. 展开更多
关键词 micro fine cement rheological properties grouting materials
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Bolt-grouting combined support technology in deep soft rock roadway 被引量:12
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作者 Chen Yanlong Meng Qingbin +2 位作者 Xu Guang Wu Haoshuai Zhang Guimin 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第5期777-785,共9页
Analyzing the mineral composition, mechanical properties and ground stress testing in surrounding rock,the study investigated the failure mechanism of deep soft rock roadway with high stress. The boltgrouting combined... Analyzing the mineral composition, mechanical properties and ground stress testing in surrounding rock,the study investigated the failure mechanism of deep soft rock roadway with high stress. The boltgrouting combined support system was proposed to prevent such failures. By means of FLAC3D numerical simulation and similar material simulation, the feasibility of the support design and the effectiveness of support parameters were discussed. According to the monitoring the surface and deep displacement in surrounding rock as well as bolt axial load, this paper analyzed the deformation of surrounding rock and the stress condition of the support structure. The monitor results were used to optimize the proposed support scheme. The results of field monitors demonstrate that the bolt-grouting combined support technology could improve the surround rock strength and bearing capacity of support structure, which controlled the great deformation failure and rheological property effectively in deep soft rock roadway with high stress. As a result, the long term stability and safety are guaranteed. 展开更多
关键词 Deep soft rock roadway Bolt-grouting support Numerical simulation Similar material simulation High stress
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The Influential Factors of Semi-Flexible Pavement Cracking Performance
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作者 XIONG Zijia GONG Minghui +1 位作者 HONG Jinxiang DENG Cheng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第5期953-962,共10页
The cracking performance of semi-flexible pavement(SFP) was investigated by using the semi-circular bending(SCB) test in this paper. Thirteen grouting slurries were prepared. The compressive strength of these material... The cracking performance of semi-flexible pavement(SFP) was investigated by using the semi-circular bending(SCB) test in this paper. Thirteen grouting slurries were prepared. The compressive strength of these materials ranges from 3 to 100 MPa. The relationship between the compressive strength of the grouting slurry and the cracking property of SFP was obtained at different loading rates and different temperatures. The peak load, fracture energy(E), flexible index(FI), and cracking resistance index(CRI) were calculated to determine the material performance. The results show that the compressive strength of the grout influences the cracking behavior. With a higher comprehensive strength grouting slurry, the FI value of SFP decreased initially and then increased slightly at 25 ℃ in 50 mm/min. The CRI value decreased at the same time. E values changed just according to the test temperature and loading rate. The damage paths of SFP are different. The damage path of the SFP sample appears as diffuse damage at 1 mm/min at 60 ℃ or clean damage at 50 mm/min at 25 ℃. These findings indicate that there is a correlation between the compressive strength of grouting slurry and SFP cracking behavior. The cracking form is influenced by loading rate and temperature. 展开更多
关键词 semi-flexible pavement cracking performance SCB grouting slurry compressive strength
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Engineering practice of reducing ground subsidence by grouting into overburden bed-separated and similar model experiment
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作者 高延法 钟亚平 +2 位作者 李建民 王素华 张庆松 《Journal of Coal Science & Engineering(China)》 2007年第3期306-309,共4页
The subsidence prediction theory under the condition of grouting into bedseparated was developed. Reducing ground subsidence by grouting was carried out on eight fully-mechanized top-coal caving faces, by using the co... The subsidence prediction theory under the condition of grouting into bedseparated was developed. Reducing ground subsidence by grouting was carried out on eight fully-mechanized top-coal caving faces, by using the continuous grouting in multiple-layer to obtain experiment results of reducing subsidence under fully mining. The similar material model that can be dismantled under the condition of constant temperature and constant humidity was developed. The model was used to simulate the evolution of overburden bed-separated under such constraints of temperature and humidity, at the same time, and to test the hardening process of similar materials. 展开更多
关键词 grouting into bed-separation similar material model volume ratio of grouting to mining full-face multiple-layer continuous grouting
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椰壳纤维加筋土遗址生态注浆材料的性能 被引量:3
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作者 芦苇 骆望 +2 位作者 李东波 刘秦龙 刘加平 《建筑材料学报》 EI CAS CSCD 北大核心 2024年第1期90-98,共9页
为提升土遗址注浆料的力学性能,以椰壳纤维掺和糯米浆、烧料礓石以及黄土改性注浆料为研究对象,研究了椰壳纤维长度和掺量(质量分数)对土遗址注浆料流动性、收缩性、抗压强度和抗折强度的影响.结果表明:椰壳纤维的掺量和长度越大,浆体... 为提升土遗址注浆料的力学性能,以椰壳纤维掺和糯米浆、烧料礓石以及黄土改性注浆料为研究对象,研究了椰壳纤维长度和掺量(质量分数)对土遗址注浆料流动性、收缩性、抗压强度和抗折强度的影响.结果表明:椰壳纤维的掺量和长度越大,浆体的流动性越低,而椰壳纤维的长度与浆体的收缩率无明显相关性;椰壳纤维良好的桥接能力可以有效提高浆体固化后的抗压强度、抗折强度和延性;椰壳纤维的长度和掺量均存在最优值,建议最优配比为纤维长度6 mm、掺量0.5%~0.6%,此时浆体固化后的抗压强度、抗折强度分别提升49.09%和32.08%;过多、过长的椰壳纤维易发生弯折、团聚,导致浆体的流动性和强度大幅降低. 展开更多
关键词 椰壳纤维 土遗址 生态注浆材料 力学性能 增强机理
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活性改性剂合成及其对环氧胶黏剂力学与界面粘接性能的影响 被引量:3
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作者 元强 王攒 +3 位作者 姚灏 黄炬 左胜浩 黄海 《材料导报》 EI CAS CSCD 北大核心 2024年第11期296-303,共8页
综合考虑环氧胶黏剂的施工性能、力学性能及与砂浆界面的粘接性能,利用三羟甲基丙烷三缩水甘油醚(TMPGE)与1,4-丁二醇(BDO),通过控制反应物物质的量比以及反应时间制备了四种低环氧值兼具高羟基含量的预聚体(PPM)。通过1H-NMR、盐酸-丙... 综合考虑环氧胶黏剂的施工性能、力学性能及与砂浆界面的粘接性能,利用三羟甲基丙烷三缩水甘油醚(TMPGE)与1,4-丁二醇(BDO),通过控制反应物物质的量比以及反应时间制备了四种低环氧值兼具高羟基含量的预聚体(PPM)。通过1H-NMR、盐酸-丙酮法及凝胶渗透色谱(GPC)对PPM进行了表征。进一步研究了PPM对改性环氧胶黏剂工作性能、固化力学性能、与水泥砂浆粘接强度以及表面性质的影响。结果显示:延长反应时间以及增加BDO用量使PPM的数均分子量更大、环氧值更低。四种PPM改性后,胶黏剂的放热峰值温度降低,可操作时间延长。同时,PPM使环氧固化物的延性显著增加。四种PPM改性后使环氧与水的接触角降低,固化物表面的极性组分升高。XPS分析表明,PPM使环氧固化物的羟基含量显著提高。最后,PPM使胶黏剂对湿砂浆基体的粘接强度提高了一倍以上。 展开更多
关键词 环氧胶黏剂 可操作时间 裂缝修补 灌浆料 界面粘接
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炔属二醇表面活性剂在环氧树脂灌浆材料中的作用 被引量:1
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作者 魏涛 张健 +1 位作者 张达 吴卫东 《长江科学院院报》 CSCD 北大核心 2024年第7期163-167,共5页
通过在CW环氧树脂灌浆材料浆液中加入2种不同结构的非离子表面活性剂炔属二醇,制备了2种改性环氧树脂灌浆材料,并开展了黏度、表面张力、接触角、渗透性和浆材固化物力学强度的研究。结果表明:加入表面活性剂对浆液的黏度、浆材固结体... 通过在CW环氧树脂灌浆材料浆液中加入2种不同结构的非离子表面活性剂炔属二醇,制备了2种改性环氧树脂灌浆材料,并开展了黏度、表面张力、接触角、渗透性和浆材固化物力学强度的研究。结果表明:加入表面活性剂对浆液的黏度、浆材固结体抗压强度、抗拉强度无明显影响,但可以提高浆材的粘接强度和抗剪强度,降低浆液的表面张力和接触角,提高浆液在黏土中渗透性。其中,加入表面活性剂S 1对浆液的粘接强度、拉伸剪切强度和在黏土中的浸润渗透高度提升更为显著,分别提高了23.6%、37.5%和109.4%。基于以上试验,初步探讨了表面活性剂提高浆液渗透性的机理。 展开更多
关键词 表面活性剂 环氧树脂灌浆材料 表面张力 接触角 渗透性
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