低温-常温循环作用下混凝土力学性能试验研究

通过试验探讨了不同低温和回至常温循环作用下混凝土的受力性能.结果表明,随低温值的降低,混凝土的低温抗压强度和弹性模量均不断提高,至-130℃附近达最大增幅,而回至常温时却呈线性缓慢恶化趋势.两种温度作用工况下的峰值应变变化很小,混凝土的低温收缩应变随低温值的降低开始很小,后呈线性状增大,经历低温回至常温后的残余应变也具有同样的变化特性,试验结果为超低温混凝土结构设计提供了一定参考.

Experimental Study on Mechanical Properties of Concrete Under Cryogenic-normal Temperatures Cycles

The mechanical properties of concrete undergoing the action from cryogenic temperatures(CTs) and CTs back to normal temperatures cycle(CTCs) are discussed by the tests.From the test results it can be shown that the compressive strength and elastic modulus of concrete increase with the decline in the CTs,and reach their ultimate values at about-130℃,but there are reverse results for the temperature action from CTs back to normal temperatures.The peak strain has little change with the decline in the CTs for the temperature action whether under CTs or CTCs.The shrinkage strain at CTs has little change at first and then increases linearly with the decline in the CTs,and the residual strain for the CTCs action has a similar changing regularity.These research results can provide references to the design of concrete structures at CTs circumstances.