我国碾压混凝土的抗裂特性研究

Research on Crack Resistance of RCC in China

混凝土的开裂主要是由于混凝土中拉应力超过了抗拉强度,或者说是由于拉伸应变达到或超过了极限拉伸值而引起的。抗裂性好的混凝土应该具有较高的抗拉强度、较大的极限拉伸值、较低的弹性模量等。本文在大量收集国内碾压混凝土材料配合比及其相应的力学和变形性能资料后,提出碾压混凝土的抗压强度、弹性模量、抗拉强度及极限拉伸值主要由水灰比和粉煤灰掺量决定。

When tensile stress is bigger than tensile strength o{ RCC or tensile strain is higher than ultimate elongation. Crack will happen in RCC. RCC with better crack resistance has higher tensile strength, bigger ultimate elongation and lower elastic modulus. We propose that a com-pressive strength, elastic modulus, tensile strength and ultimate elongation are decided by water/binding materials ratio and content of flyash after collecting data of RCC in China.