STRESS-STRAIN RELATIONSHIP OF CONCRETE AFTER FREEZING-THAWING CYCLES
In order to investigate the stress-strain relationship of concrete after freezing-thawing cycles,three series of prisms concrete specimens with water-cement ratio of 0.6,0.54and 0.48 respectively were exposed to rapid freezing-thawing in water following therequirement of Chinese standard GBJ 82-85. Then the axial compressive loading tests werecarried out to obtain the complete stress-strain curves of concrete using INSTRON 8506 testsystem. The test results of the 85 specimens show: with the increase of freezing-thawing cyclenumber the concrete stress-strain curve becomes more flat,the peak stress decreases and thepeak strain increases; with the same number of freezing-thawing cycle,the reduction of thepeak stress and the increase of the peak strain are more serious for lower strength concrete.Based on the test results the complete stress-strain curve equations for frozen-thawed concreteare suggested. The equations are suitable for concrete with cubic strength of 30 Mpa-50 MPa.
concrete freezing-thawing cycle complete stress-strain curve equation
Duan An Qian Jiaru
Department of Civil Engineering,Key Laboratory for Structural Engineering and Vibration of Education Ministry,Tsinghua University,Beijing,100084,PR China
国际会议
The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)
杭州
英文
329-336
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）