水泥稳定碎石力学特性研究

为研究水稳碎石材料的力学特性,通过简单加载试验、逐级加载试验和循环加载试验,分析了加载方式、应力水平、龄期对其抗压强度、割线模量、破坏应变和累积应变变化规律的影响。结果表明:水泥稳定碎石是典型的弹塑性材料,应力依赖性明显,对荷载变化敏感,弹性和塑性的临界值为(0.7~0.8)σmax;随着应力水平的增加,简单加载和逐级加载所提取的不同龄期下割线模量先增加后减小,出现峰值所对应的荷载级别随龄期增长而增加,且循环加载和逐级加载累积应变出现突变;龄期增加,3个加载试验所提取的割线模量和抗压强度增长明显,而破坏应变减小;破坏应变大小顺序为循环加载>逐级加载>简单加载。

Research on Mechanical Properties of Cement-stabilized Aggregate

In order to study the mechanical properties of cement-stabilized aggregate,the effects of loading mode,stress level and curing age on compressive strength,secant modulus,failure strain and cumulative strain are analyzed by simple loading test,incremental loading test and repeated loading test.The results show that cement stabilized aggregate is a typical elastoplastic material with obvious stress dependence and sensitivity to load changes.The critical value of elasticity and plasticity is(0.7~0.8)σmax.With the increase of stress level,the secant modulus value under different curing ages extracted by simple loading test and incremental loading test increases first and then decreases,and the load level corresponding to the peak increases with the increase of curing age,and the cumulative strain under repeated loading test and repeated loading test increase suddenly.With the increase of curing age,the secant modulus and compressive strength extracted from the three loading tests increase significantly,while the failure strain decreases.The order of the failure strain value is repeated loading >incremental loading>simple loading.