混凝土的耐钻磨性研究及数学模型

研究了水泥石和骨料的显微硬度以及骨料体积分数对混凝土耐钻磨性和抗压强度的影响,探索了影响混凝土耐钻磨性的主要参数,并基于两相复合材料理论建立了混凝土耐钻磨性的数学模型.结果表明:在各组分显微硬度和骨料体积分数分别变化时,混凝土耐钻磨性和抗压强度之间并不一直存在线性关系;各组分显微硬度及其体积分数是影响混凝土耐钻磨性的主要参数;根据混凝土耐钻磨性的数学模型得出的预测硬度与实测硬度偏差大都在20%以内,验证了所提模型的合理性.

Investigation on Drill Grinding Resistance and Mathematical Model of Concrete

The influences of the microhardness of cement matrix and aggregate, volume fraction of aggregate on drill grinding resistance and compressive strength were studied, and the main influential parameters on drill grinding resistance of concrete were explored. Mathematical model about drill grinding resistance of concrete was established based on two phase composite theory. The results indicate that linear relationship between drill grinding resistance and compressive strength does not always exist as the microhardness of cement or aggregate and the volume fraction of aggregate change. Microhardness, volume fraction of cement matrix and aggregate are the main influential parameters on drill grinding resistance of concrete. The deviations between the predictions and test results are less than 20%, which verifies the rationality of the drill grinding resistance model of concrete.