期刊文献+
共找到4,413篇文章
< 1 2 221 >
每页显示 20 50 100
Properties of Sustainable High Strength Concrete with Waste Copper Slag
1
作者 JAGAN Sivamani KARUPASAMY Narayanan +3 位作者 DHARMARAJ R THIYANESWARAN Periyasamy KARTHIKEYAN Selvarajan NAVANEETHAN Kumaravalasu Subramaniam 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第4期815-822,共8页
The present work investigates copper slag as a substitute for river sand in high-strength concrete.The concrete mixtures were manufactured with 10%,30%,50%,70%,and 100%of copper slag to evaluate the mechanical and dur... The present work investigates copper slag as a substitute for river sand in high-strength concrete.The concrete mixtures were manufactured with 10%,30%,50%,70%,and 100%of copper slag to evaluate the mechanical and durability properties.The experimental results indicate that replacing copper slag above 50%affects the performance characteristics of the concrete due to its high angularity and lower water absorption characteristics.The strength of concrete with 50%copper slag is improved by 5.6%,whereas the strength of concrete with 100%copper slag is reduced by 2.75%at 28 days.However,increased curing to 90days improves the strength of the former by 7.16%and reduces the latter by only 0.23%.The water absorption,porosity,and rapid chloride penetration of the concrete mixtures with 100%copper slag are increased by 10.44%,13.20%,and 19.56%compared to control concrete.Micro-structural investigations through SEM infer higher replacement of copper results in higher void formation due to its reduced water absorption. 展开更多
关键词 copper slag high strength concrete strength water absorption POROSITY
下载PDF
Study on High Strength Concrete Confined by Continuous Carbon Fiber Sheet 被引量:2
2
作者 赵彤 谢剑 +1 位作者 刘明国 河村博之 《Transactions of Tianjin University》 EI CAS 2002年第1期12-15,共4页
Eight high strength concrete (HSC) prisms strengthened with continuous carbon fiber sheet(CFS)were tested.As a result of the confinement provided by CFS,the concrete would fail at a greater strain than the unconfined ... Eight high strength concrete (HSC) prisms strengthened with continuous carbon fiber sheet(CFS)were tested.As a result of the confinement provided by CFS,the concrete would fail at a greater strain than the unconfined and then a significant increase in ductility can be achieved.The lateral pressure exerted by CFS would increase the compressive strength of the concrete,resulting in higher load bearing capacity.This paper proposes the stress strain curve of this kind of hybrid specimen,which agrees well with the test results.Based on the stress strain relationship and the assumptions proposed in this paper,a computer program was developed to analyze HSC columns,confined by CFS,which were subjected to axial compression and biaxial bending.The results shown in this paper indicate that the ductility of HSC column is significantly improved and the strength is also increased by some degree. 展开更多
关键词 high strength concrete carbon fiber sheet strength DEFORMATION
下载PDF
RESEARCH ON T SHAPED HIGH STRENGTH CONCRETE MEMBERS SUBJECTED TO AXIAL COMPRESSION AND BIAXIAL BENDING
3
作者 赵彤 戴自强 翁维素 《Transactions of Tianjin University》 EI CAS 1998年第1期68-71,共4页
Based on experiments, a computer program is developed. The calculated results agree well with the experimental results. The flexural behavior of T shaped high strength concrete members subjected to axial compression ... Based on experiments, a computer program is developed. The calculated results agree well with the experimental results. The flexural behavior of T shaped high strength concrete members subjected to axial compression and biaxial bending is studied. The main factors affecting the flexural behavior of T shaped high strength concrete members are loading angle, axial compression ratio and reinforcement ratio. 展开更多
关键词 high strength concrete irregularly shaped member flexural behavior
下载PDF
The Frost-resisting Durability of High Strength Self-Compacting Pervious Concrete in Deicing Salt Environment 被引量:10
4
作者 封金财 ZONG Ningwen +3 位作者 ZHU Pinghua 刘惠 YAO Lan GENG Jiang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2020年第1期167-175,共9页
A high strength self-compacting pervious concrete(SCPC) with top-bottom interconnected pores was prepared in this paper. The frost-resisting durability of such SCPC in different deicing salt concentrations(0%, 3%, 5%,... A high strength self-compacting pervious concrete(SCPC) with top-bottom interconnected pores was prepared in this paper. The frost-resisting durability of such SCPC in different deicing salt concentrations(0%, 3%, 5%, 10%, and 20%) was investigated. The mass-loss rate, relative dynamic modulus of elasticity, compressive strength, flexural strength and hydraulic conductivity of SCPC after 300 freeze-thaw cycles were measured to evaluate the frost-resisting durability. In addition, the microstructures of SCPC near the top-bottom interconnected pores after 300 freeze-thaw cycles were observed by SEM. The results show that the high strength SCPC possesses much better frost-resisting durability than traditional pervious concrete(TPC) after 300 freeze-thaw cycles, which can be used in heavy loading roads. The most serious freeze-thaw damage emerges in the SCPC immersed in the 3% of Na Cl solution, while there is no obvious damage in 20% of Na Cl solution. Furthermore, it can be deduced that the high strength SCPC can be used for 100 years in a cold environment. 展开更多
关键词 high strength SELF-COMPACTING pervious concrete top-bottom interconnected pores heavy loading road frost-resisting DURABILITY DEICING salt ENVIRONMENT
下载PDF
Seismic performance of steel reinforced ultra high-strength concrete composite frame joints 被引量:5
5
作者 Yan Changwang Jia Jinqing 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2010年第3期439-448,共10页
To investigate the seismic performance of a composite frame comprised of steel reinforced ultra high-strength concrete (SRUHSC) columns and steel reinforced concrete (SRC) beams, six interior frame joint specimens... To investigate the seismic performance of a composite frame comprised of steel reinforced ultra high-strength concrete (SRUHSC) columns and steel reinforced concrete (SRC) beams, six interior frame joint specimens were designed and tested under low cyclically lateral load. The effects of the axial load ratio and volumetric stirrup ratio were studied on the characteristics of the frame joint performance including crack pattern, failure mode, ductility, energy dissipation capacity, strength degradation and rigidity degradation. It was found that all joint specimens behaved in a ductile manner with flexural-shear failure in the joint core region while plastic hinges appeared at the beam ends. The ductility and energy absorption capacity of joints increased as the axial load ratio decreased and the volumetric stirIup ratio increased. The displacement ductility coefficient and equivalent damping coefficient of the joints fell between the corresponding coefficients of the steel reinforced concrete (SRC) frame joint and RC frame joint. The axial load ratio and volumetric stirrup ratio have less influence on the strength degradation and more influence on the stiffness degradation. The stiffness of the joint degrades more significantly for a low volumetric stirrup ratio and high axial load ratio. The characteristics obtained from the SRUHSC composite frame joint specimens with better seismic performance may be a useful reference in future engineering applications. 展开更多
关键词 cyclical test axial load ratio volumetric stirrup ratio DUCTILITY strength degradation stiffness degradation steel reinforced ultra high strength concrete beam-column joint
下载PDF
Internal Curing Using Water-releasing Material for High Strength Micro-expansive Concrete 被引量:5
6
作者 吕林女 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第3期510-513,共4页
Due to its low water content, it is difficult for expansive agent to have an effective expansive effect on high strength concrete to compensate its extensive shrinkage and form a certain expansion. To solve this probl... Due to its low water content, it is difficult for expansive agent to have an effective expansive effect on high strength concrete to compensate its extensive shrinkage and form a certain expansion. To solve this problem, water-releasing material with water storage and releasing characteristics was incorporated into high strength micro-expansive concrete to provide internal curing, and expansive effect of expansive agent was improved. Migration of water from initially saturated water-releasing material to the surrounding hydrating cement paste was investigated. Based on a given efficient diffusion distance of water stored in water-releasing material, the mass and real water-cement ratio of cured cement paste were estimated. At the same time, the effect of internal curing of water-releasing material on the volume deformation of high strength micro-expansive concrete was investigated. 展开更多
关键词 water-releasing material high strength concrete expansive internal curing
下载PDF
Experimental study on the seismic behavior of high strength concrete fi lled double-tube columns 被引量:12
7
作者 Qian Jiaru Li Ningbo +1 位作者 Ji Xiaodong Zhao Zuozhou 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2014年第1期47-57,共11页
To study the seismic behavior of high strength concrete fi lled double-tube(CFDT) columns,each consisting of an external square steel tube and an internal circular steel tube,quasi-static tests on eight CFDT column sp... To study the seismic behavior of high strength concrete fi lled double-tube(CFDT) columns,each consisting of an external square steel tube and an internal circular steel tube,quasi-static tests on eight CFDT column specimens were conducted.The test variables included the width-to-thickness ratio(β1) and the area ratio(β2) of the square steel tube,the wall thickness of the circular steel tube,and the axial force(or the axial force ratio) applied to the CFDT columns.The test results indicate that for CFDT columns with a square steel tube with β1 of 50.1 and 24.5,local buckling of the specimen was found at a drift ratio of 1/150 and 1/50,respectively.The lateral force-displacement hysteretic loops of all specimens were plump and stable.Reducing the width-to-thickness ratio of the square steel tube,increasing its area ratio,or increasing the wall thickness of the internal circular steel tube,led to an increased fl exural strength and deformation capacity of the specimens.Increasing the design value of the axial force ratio from 0.8 to 1.0 may increase the fl exural strength of the specimens,while it may also decrease the ultimate deformation capacity of the specimen with β1 of 50.1. 展开更多
关键词 high strength concrete fi lled double-tube(CFDT)column seismic behavior area ratio of the square steel tube width-to-thickness ratio of the square steel tube axial force ratio quasi-static test
下载PDF
Influence of MB-value of Manufactured Sand on the Shrinkage and Cracking of High Strength Concrete 被引量:4
8
作者 王稷良 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第2期321-325,共5页
The relation between methylene blue (MB) value of MS and its limestone dust content and clay content was investigated. The effects of MB value ranging from 0.35 to 2.5 on the workability of fresh concrete and crack ... The relation between methylene blue (MB) value of MS and its limestone dust content and clay content was investigated. The effects of MB value ranging from 0.35 to 2.5 on the workability of fresh concrete and crack propagation characteristics at the age of 24 hours, and effects on the mechanical properties, dry shrinkage of the harden concrete were tested. The experimental results show that the MB value is not related with the limestone dust content of MS, but in direct proportion to clay content. With the increase of MB value, the concrete workability decreases, and the flexural strength and 7 d compressive strength reduce markedly, whearas the 28 d compressive strength is not affected. When the MB-value is less than or equal to 1.35, the change of the MB-value has a little influence on early plastic cracking and dry shrinkage property of concrete, but when the MB-value is more than 1.35, the tendency of plastic cracking and dry shrinkage is remarkable. 展开更多
关键词 manufactured sand methylene blue value high strength concrete anti-cracking SHRINKAGE
下载PDF
Experimental investigation of axially loaded steel fiber reinforced high strength concrete-filled steel tube columns 被引量:9
9
作者 卢亦焱 李娜 +1 位作者 李杉 梁鸿骏 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第6期2287-2296,共10页
An experimental study on the compressive behavior of steel fiber reinforced concrete-filled steel tube columns is presented. Specimens were tested to investigate the effects of the concrete strength, the thickness of ... An experimental study on the compressive behavior of steel fiber reinforced concrete-filled steel tube columns is presented. Specimens were tested to investigate the effects of the concrete strength, the thickness of steel tube and the steel fiber volume fraction on the ultimate strength and the ductility. The experimental results indicate that the addition of steel fibers in concrete can significantly improve the ductility and the energy dissipation capacity of the concrete-filled steel tube columns and delay the local buckling of the steel tube, but has no obvious effect on the failure mode. It has also been found that the addition of steel fibers is a more effective method than using thicker steel tube in enhancing the ductility, and more advantageous in the case of higher strength concrete. An analytical model to estimate the load capacity is proposed for steel tube columns filled with both plain concrete and steel fiber reinforced concrete. The predicted results are in good agreement with the experimental ones obtained in this work and literatures. 展开更多
关键词 concrete-filled steel tube (CFST) zolumns steel fiber high strength concrete axial load DUCTILITY load capacity
下载PDF
Detection of Thermophysical Properties for High Strength Concrete after Exposure to High Temperature 被引量:3
10
作者 杜红秀 WU Jia +2 位作者 LIU Gaili WU Huiping YAN Ruizhen 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第1期113-120,共8页
Using the detection principle of infrared thermal imaging technique and the detection principle of DRH thermal conductivity tester laboratory,we investigated the infrared thermal image inspection,coefficient of therma... Using the detection principle of infrared thermal imaging technique and the detection principle of DRH thermal conductivity tester laboratory,we investigated the infrared thermal image inspection,coefficient of thermal conductivity,apparent density,and compressive strength test on C80 high-strength concrete(HSC) in the presence and absence of polypropylene fibers under completely heated conditions.Only slight damages were detected below 400 ℃,whereas more and more severe deterioration events were expected when the temperature was above 500 ℃.The results show that the elevated temperature through infrared images generally exhibits an upward trend with increasing temperature,while the coefficient of thermal conductivity and apparent density decrease gradually.Additionally,the addition of polypropylene fibers with appropriate length,diameter,and quantity contributes to the improvement of the high-temperature resistance of HSC. 展开更多
关键词 high-strength concrete polypropylene fiber high temperature infrared thermal imaging technique coefficient of thermal conductivity compressive strength ratio
下载PDF
Mechanism of improving ductility of high strength concrete T-section beam confined by CFRP sheet subjected to flexural loading 被引量:4
11
作者 王苏岩 王泽源 《Journal of Central South University》 SCIE EI CAS 2013年第1期246-255,共10页
For the purpose of inventing a new seismic retrofitting method for the reinforced high strength concrete (HSC) T-section beam using carbon fiber reinforced polymer (CFRP) sheet, three series, a total of twelve T-s... For the purpose of inventing a new seismic retrofitting method for the reinforced high strength concrete (HSC) T-section beam using carbon fiber reinforced polymer (CFRP) sheet, three series, a total of twelve T-section beams with nine specimens confined by CFRP sheet in the plastic zone and three control beams were conducted up to failure under four-point bending test. The effectiveness of confining CFRP sheet on improving the flexural ductility of tmstrengthened T-section beams was studied. The parameters such as the width and the thickness of CFRP sheet and the type of T-section were analyzed. The experimental results show that ductility and rotation capacity of plastic hinge can be improved by the confinement of CFRP sheet, and the ductility indices increase with the increment of width and thickness of CFRP sheet. A plastic rotation model considering the width of CFRP sheet and the effect of flange of T-section beam is proposed on the basis of the model of BAKER, and the test results show a good agreement with the perdicted results. The relevant construction suggestions for seismic retrofitting design of beam-slabs system in cast-in-place framework structure are presented. 展开更多
关键词 high strength concrete fiber reinforced polymer T-section BEAM DUCTILITY plastic hinge
下载PDF
Residual Mechanical Properties and Explosive Spalling Behavior of Ultra-High-Strength Concrete Exposed to High Temperature 被引量:2
12
作者 Gaifei Peng Juan Yang 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2017年第4期62-70,共9页
In order to explore the characteristics of ultra-high-strength concrete exposed to high temperature,residual mechanical properties and explosive spalling behavior of ultra-high-strength concrete( UHSC) and high streng... In order to explore the characteristics of ultra-high-strength concrete exposed to high temperature,residual mechanical properties and explosive spalling behavior of ultra-high-strength concrete( UHSC) and high strength concrete( HSC) exposed to high temperatures ranging from 20 ℃ to 800 ℃ were determined. The microstructure of the specimens after exposure to elevated temperature was analyzed by means of scanning electron microscope( SEM) and mercury intrusion porosimetry( MIP). The residual compressive strengths of UHSC and HSC were first increased and then decreased as temperature increased. After exposure to 800 ℃,the compressive strengths of UHSC and HSC were 24. 2 % and 22. 3 % of their original strengths at 20 ℃,respectively. The residual splitting tensile strengths of both UHSC and HSC were consistently decreased with the temperature increasing and were approximately 20% of their original strengths after 800 ℃. However,the residual fracture energies of both concretes tended to ascend even at 600 ℃. The explosive spalling of UHSC was more serious than that of HSC. Moisture content of the specimens governs the explosive spalling of both concretes with a positive correlations,and it is more pronounced in UHSC. These results suggest that UHSC suffers a substantial loss in load-bearing capacity and is highly prone to explosive spalling due to high temperature. The changes in compressive strength are due to the changes in the density and the pore structure of concrete. The probability and severity of explosive spalling of UHSC are much higher than those of HSC due to the higher pore volume in HSC. 展开更多
关键词 ultra-high-strength concrete high strength concrete RESIDUAL mechanical properties EXPLOSIVE SPALLING
下载PDF
Autogenous Shrinkage of High Strength Lightweight Aggregate Concrete 被引量:2
13
作者 丁庆军 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第4期123-125,共3页
The characteristic of autogenous shrinkage(AS) and its effect on high strength lightweight aggregate concrete(HSLAC) were studied.The experimental results show that the main shrinkage of high strength concrete is ... The characteristic of autogenous shrinkage(AS) and its effect on high strength lightweight aggregate concrete(HSLAC) were studied.The experimental results show that the main shrinkage of high strength concrete is AS and the amount of cement can affect the AS of HSLAC remarkably,At the early stage the AS of HSLAC is lower than that of high strength normal concrete,but it has a large growth at the later stage.The AS of high strength normal concrete becomes stable at 90d age,but HSLAC still has a high AS growth .It is found that adjusting the volume rate of lightweight aggregate,mixing with a proper dosage of fly ash and raising the water saturation degree of lightweight aggregate can markedly reduce the AS rate of HSLAC. 展开更多
关键词 high strength lightweight aggregate concrete autogenous shrinkage lightweight aggregate volume rate
下载PDF
FAILURE MODE AND CONSTITUTIVE MODEL OF PLAIN HIGH-STRENGTH HIGH-PERFORMANCE CONCRETE UNDER BIAXIAL COMPRESSION AFTER EXPOSURE TO HIGH TEMPERATURES 被引量:2
14
作者 Zhenjun He Yupu Song 《Acta Mechanica Solida Sinica》 SCIE EI 2008年第2期149-159,共11页
An orthotropic constitutive relationship with temperature parameters for plain highstrength high-performance concrete (HSHPC) under biaxial compression is developed. It is based on the experiments performed for char... An orthotropic constitutive relationship with temperature parameters for plain highstrength high-performance concrete (HSHPC) under biaxial compression is developed. It is based on the experiments performed for characterizing the strength and deformation behavior at two strength levels of HSHPC at 7 different stress ratios including a=σs : σ3=0.00:-1,-0.20:-1,-0.30 : -1,-0.40:-1,-0.50:-1,-0.75:-1,-1.00:-1, after the exposure to normal and high temperatures of 20, 200, 300, 400, 500 and 600℃, and using a large static-dynamic true triaxial machine. The biaxial tests were performed on 100 mm×100 mm×100 mm cubic specimens, and friction-reducing pads were used consisting of three layers of plastic membrane with glycerine in-between for the compressive loading plane. Based on the experimental results, failure modes of HSHPC specimens were described. The principal static compressive strengths, strains at the peak stress and stress-strain curves were measured; and the influence of the temperature and stress ratios on them was also analyzed. The experimental results showed that the uniaxial compressive strength of plain HSHPC after exposure to high temperatures does not decrease dramatically with the increase of temperature. The ratio of the biaxial to its uniaxial compressive strength depends on the stress ratios and brittleness-stiffness of HSHPC after exposure to different temperature levels. Comparison of the stress-strain results obtained from the theoretical model and the experimental data indicates good agreement. 展开更多
关键词 high-strength high-performance concrete (HSHPC) high temperatures uniaxial biaxial compressive strength failure criterion stress-strain relationship
下载PDF
Charactersitics of Stress-strain Curve of High Strength Steel Fiber Reinforced Concrete under Uniaxial Tension 被引量:2
15
作者 杨萌 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2006年第3期132-137,共6页
A whole of 110 specimens divided into 22 groups were tested with varying the volume fraction of steel fibers and the matrix strength of these specimens. The stress-strain behaviors of four types of steel fiber reinfo... A whole of 110 specimens divided into 22 groups were tested with varying the volume fraction of steel fibers and the matrix strength of these specimens. The stress-strain behaviors of four types of steel fiber reinforced concrete (SFRC) under uniaxial tension were studied experimentally. When the matrix strength and the fiber content increase, the tensile stress and tensile strain vary differently according to the fiber type. The mechanisms of reinforcing effect for different types of fiber were analyzed and the stress-strain curves of the specimens were plotted. Some experimental factors for stress or strain of SFRC were given. A tensile toughness modulus Re0.5 was introduced to evaluate the toughness characters of SFRC under uniaxial tension. Moreover, the formula of the tensile stress-strain curve of SFRC was regressed. The theoretical curve and the experimental ones fit well, which can be used for references in construction. 展开更多
关键词 steel fiber reinforced concrete high strength uniaxial tension soften characteristics stress-strain curve
下载PDF
Evaluation of the Shear Strength of Perfobond Rib Connectors in Ultra High Performance Concrete 被引量:6
16
作者 Jae Yoon Kang Jong Sup Park +1 位作者 Woo Tai Jung Moon Seoung Keum 《Engineering(科研)》 2014年第13期989-999,共11页
Since the previous strength prediction models for the perfobond rib connector were proposed based upon the results of push-out tests conducted on concretes with compressive strength below 50 MPa, push-out test is perf... Since the previous strength prediction models for the perfobond rib connector were proposed based upon the results of push-out tests conducted on concretes with compressive strength below 50 MPa, push-out test is performed on perfobond shear connectors applying ultra high performance concretes with compressive strength higher than 80 MPa to evaluate their shear resistance. The test variables are chosen to be the diameter and number of dowel holes and, the change in the shear strength of the perfobond rib connector is examined with respect to the strength of two types of UHPC: steel fiber-reinforced concrete with compressive strength of 180 MPa and concrete without steel fiber with compressive strength of 80 MPa. The test results reveal that higher concrete strength and larger number of holes increased the shear strength, and that higher increase rate in the shear strength was achieved by the dowel action. The comparison with the predictions obtained by the previous models shows that the experimental results are close to the values given by the model proposed by Oguejiofor and Hosain [1]. 展开更多
关键词 Perfobond RIB CONNECTOR Ultra high Performance concrete Push-Out Test SHEAR strength
下载PDF
Structural Behavior of Continuous Prestressed Steel Fiber Reinforced High Strength Concrete Beam 被引量:2
17
作者 刘海波 向天宇 赵人达 《Journal of Southwest Jiaotong University(English Edition)》 2008年第1期37-45,共9页
The flexural behaviors of continuous fully and partially prestressed steel fiber reinforced high strength concrete beams are studied by experiment and nonlinear finite element analysis. Three levels of partial prestre... The flexural behaviors of continuous fully and partially prestressed steel fiber reinforced high strength concrete beams are studied by experiment and nonlinear finite element analysis. Three levels of partial prestress ratio (PPR) are considered, and three pairs of two-span continuous beams with box sections varying in size are designed. The major parameters involved in the study include the PPR and the fiber location. It is concluded that the prestressed high strength concrete beam exhibits satisfactory ductility; the influences of steel fiber on the crack behaviors for partially prestressed beams are not as obvious as those for fully prestressed ones; steel fibers can improve the structural stiffness after cracking for fully prestressed high strength concrete beams; the moment redistribution from mid-span to intermediate support in the first stage should be mainly considered in practical design. 展开更多
关键词 high strength concrete Steel fiber reinforced concrete Prestressed concrete Continuous beam
下载PDF
Performances of the High Strength Low Heat Pump Concrete (HLPC) 被引量:1
18
作者 张云升 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2002年第3期56-59,共4页
The effects of mineral admixtures on fluidity,mechanical and hydrational exothermic behavior were studied.The results show that,double adding ways,i e,fly ash and slag were added at the same time,not only improves th... The effects of mineral admixtures on fluidity,mechanical and hydrational exothermic behavior were studied.The results show that,double adding ways,i e,fly ash and slag were added at the same time,not only improves the fluidity of fresh concrete with low W/B and compensates the lower early compressive strength of harden concrete caused by high adding amount of fly ash, but also greatly reduces the highest temperature rise, exothermic rate and total heat liberation of 3 day of binder pastes in HLPC, and postponed the arrival time of the highest temperature rise. HLPC was prepared and applied to project practice successfully. 展开更多
关键词 mineral admixtures double adding ways high strength PUMP low hydration heat concrete
下载PDF
Mechanical properties of high-strength concrete subjected to high temperature by stressed test 被引量:10
19
作者 Gyu-Yong KIM Young-Sun KIM Tae-Gyu LEE 《中国有色金属学会会刊:英文版》 CSCD 2009年第B09期128-133,共6页
Recently, the effects of high temperature on compressive strength and elastic modulus of high strength concrete were experimentally investigated. The present study is aimed to study the effect of elevated temperatures... Recently, the effects of high temperature on compressive strength and elastic modulus of high strength concrete were experimentally investigated. The present study is aimed to study the effect of elevated temperatures ranging from 20 ℃ to 700 ℃ on the material mechanical properties of high-strength concrete of 40, 60 and 80 MPa grade. During the strength test, the specimens are subjected to a 25% of ultimate compressive strength at room temperature and sustained during heating, and when the target temperature is reached, the specimens are loaded to failure. The tests were conducted at various temperatures (20-700 ℃) for concretes made with W/B ratios of 46%, 32% and 25%, respectively. The results show that the relative values of compressive strength and elastic modulus decrease with increasing compressive strength grade of specimen. 展开更多
关键词 高强混凝土 高温作用 力学性能 测试 抗压强度 温度升高 弹性模量 强度试验
下载PDF
Mechanical Properties and Flowability of High Strength Concrete Incorporating Ground Granulated Blast-furnace Slag 被引量:1
20
作者 姚武 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2001年第3期42-45,共4页
The high strength concrete(HSC)was produced by partially replacingthe normal portland cement with special ground granulatedblast-furnace slag(GGBS)ranging up to 60/100. The effects of the GGBSon the flowabilityand mec... The high strength concrete(HSC)was produced by partially replacingthe normal portland cement with special ground granulatedblast-furnace slag(GGBS)ranging up to 60/100. The effects of the GGBSon the flowabilityand mechanical properties of HSC were studied. Thehydration process and microstructure char- acteristics wereinvestigated by X-ray diffraction(XRD)and scanning microscopy(SEM),respectively. The test results indicate that the GGBS has especiallysupplementary effect on water reducing and excellent property Ofbetter control of lump loss. 展开更多
关键词 high strength concrete mechanical property FLOWABILITY
下载PDF
上一页 1 2 221 下一页 到第
使用帮助 返回顶部