粉煤灰和磨细矿粉的掺量对C30大体积混凝土强度和收缩的影响

Effect of dosages of fly ash and grinded slag powder in C30 mass concrete on strength and shrinkage

本文研究了粉煤灰和磨细矿渣对大体积混凝土抗压强度、收缩的影响。实验结果表明:掺入粉煤灰和磨细矿渣的混凝土早期强度低,后期强度比较高;当水泥的用量为195kg/m3,粉煤灰的用量为145kg/m3,矿粉的用量为40kg/m3时强度达到设计要求,收缩小;从SEM图看出,磨细矿渣掺量大的混凝土更密实。

In this paper,the effect of fly ash and grinded slag powder on strength and shrinkage of mass concrete is showed.The results show that the early strength of the concrete mixed with fly ash and grinded slag powder is low,but ultimate strength is high.While cement is 195kg/m3 fly ash is 145kg/m3 grinded slag powder is 40kg/m3,strength is satisfied and shrinkage is small.From SEM,the concrete becomes close-grained as the dosages of grinded slag powder increase.