Guo Min, Gao Ri
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China.
Materials (Basel). 2021 May 19;14(10):2660. doi: 10.3390/ma14102660.
The characteristic tensile strain of reactive powder concrete is a critical indicator of its resistance to cracking. In order to study its crack resistance performance, in this study, we investigated changes over time in the characteristic tensile strain patterns of reactive powder concrete. An axial tensile test was performed to obtain the stress-strain curves of reactive powder concrete after curing ages from 3 to 56 days, and then we identified changes over time in the initial and ultimate tensile strain patterns. An analysis was conducted to determine the correlation between the initial tensile strain and the ratio of tensile strength to elastic modulus. The correlations between the ultimate tensile strain and its curing age as well as that of the ultimate tensile strain with its tensile strength and its compressive strength were established, and an approach was proposed for calculating the characteristic age of reactive powder concrete.
活性粉末混凝土的特征拉伸应变是其抗裂性的关键指标。为研究其抗裂性能，本研究调查了活性粉末混凝土特征拉伸应变模式随时间的变化。进行了轴向拉伸试验，以获取养护龄期为3至56天的活性粉末混凝土的应力-应变曲线，然后确定初始和极限拉伸应变模式随时间的变化。进行分析以确定初始拉伸应变与抗拉强度与弹性模量之比之间的相关性。建立了极限拉伸应变与其养护龄期、极限拉伸应变与其抗拉强度和抗压强度之间的相关性，并提出了一种计算活性粉末混凝土特征龄期的方法。
