水泥路面板芯样的压缩试验及流变特性

发布时间：2019-05-06 19:38

【摘要】：为了研究水泥路面在服役若干年后混凝土面板力学行为和技术性能的变化,并为水泥路面的结构设计、性能评价和养护维修等提供理论参考,在通车已达16年的水泥路面中钻芯取样,并在实验室制作了同标号水泥混凝土试件用以对比分析;将这2种新、旧混凝土圆柱体试件在3个加载速率下按照"简单加载至破坏"和"循环加载后至破坏"2种加载方式进行压缩试验。试验结果表明:新混凝土具有1个屈服应力,而旧混凝土则有2个屈服应力;在第一屈服应力的80%范围内和较高加载速率下,混凝土主要表现为线弹性,较低加载速率时才会表现出微量粘性;弹性模量的取值可采用"80%度量法"的割线模量;水泥路面板服役16年后,其抗压弹性模量和抗压极限应力分别衰减了约29%和56%。
[Abstract]:In order to study the changes of mechanical behavior and technical performance of cement pavement after several years of service, and to provide a theoretical reference for the structural design, performance evaluation, maintenance and maintenance of cement pavement, Core sampling was carried out in the cement pavement which has been open to traffic for 16 years, and the same grade cement concrete specimens were made in the laboratory for comparative analysis. The compression tests of these two new and old concrete cylinder specimens under three loading rates are carried out according to two loading modes: "simple loading to failure" and "cyclic loading to failure". The experimental results show that the new concrete has one yield stress, while the old concrete has two yield stresses. In the range of 80% of the first yield stress and at the higher loading rate, the concrete mainly displays linear elasticity, and shows a small amount of viscosity when the loading rate is low, and the value of elastic modulus can be determined by the Secant Modulus of the "80% degree method". After 16 years of service, the compressive elastic modulus and compressive ultimate stress of cement pavement board decreased by about 29% and 56%, respectively.
【作者单位】：长安大学公路学院;长安大学材料科学与工程学院;长安大学理学院;
【基金】：四川省交通科技项目(2011A7-4-1) 中央高校基本科研业务费专项资金项目(CHD2011ZD013)
【分类号】：U416.216

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