受冻融环境混凝土的应力-应变全曲线试验研究  

Experimental study on complete compressive stress-strain curve of concrete subjected to freeze-thaw cycles

作　　者：段安[1] 钱稼茹[1] 

机构地区：[1]清华大学土木工程系结构工程与振动教育部重点实验室,北京100084

出　　处：《混凝土》2008年第8期13-16,共4页Concrete

基　　金：国家自然科学基金重点项目(50538060)

摘　　要：为研究受冻融循环作用的混凝土受压应力-应变关系,按照GBJ 82—85规定的快速冻融试验方法,对3批共85个尺寸为100 mm×100 mm×300 mm的混凝土棱柱体试件进行了冻融循环,试件的变化参数为混凝土立方体抗压强度和冻融循环次数;然后对试件进行了单轴抗压破坏试验。结果表明:随着冻融循环次数增加,混凝土的受压应力-应变曲线渐趋扁平,峰值应力降低,峰值应变增大;冻融循环次数相同时,混凝土立方体抗压强度高的试件,其峰值应力降低程度和峰值应变增大程度小于混凝土强度低的试件。回归试验结果,提出了适用于立方体抗压强度为30～50 MPa的受冻融循环作用混凝土的应力-应变全曲线方程及确定其参数的公式。To study complete compressive stress-strain curve of concrete subjected to freeze-thaw cycles, three groups of 85 concrete prisms specimens with dimensions of 100 mm×100 mm×300 mm were exposed to rapid freeze-thaw in water according to Chinese standard GBJ 82-85. The parameters of the specimens are cubic strength and freeze-thaw cycle numbers.An specimens were tested under uni-axial compressive loading. The test results show：with the increase of freeze-thaw cycle number,the concrete stress-strain curve becomes more flat,the peak stress decreases and the peak strain increases;with the same number of freeze-thaw, the reduction of the peak stress and the increase of the peak strain are more serious for lower strength concrete.Based on the test results, the complete compressive stress-strain curve equations for frozen-thawed concrete with necessary parameters are suggested.The equations are suitable for concrete with cubic strength of 30-50 MPa.

关 键 词：混凝土 冻融循环 受压应力-应变全曲线 

分 类 号：TU528.01[建筑科学—建筑技术科学]