利用低品质原材料配制C30和C40自密实混凝土的研究

Research on the C30 and C40 concretes prepared with low-quality raw materials

针对低品质的水泥和骨料等原材料,采用含有黏度改性剂的减水剂,配制了C30和C40自密实混凝土。与普通泵送混凝土相比,自密实混凝土的水泥用量低、水灰比低、砂率大。试验结果显示:自密实混凝土具有良好的工作性,其强度、弹性模量、干燥收缩、抗氯离子渗透性、抗碳化性能与同强度等级的普通泵送混凝土的性能相近。

C30 and C40 self-compacting concretes with low-quality cement and aggregates were prepared by using superplasticizer containing viscosity modifier.The cement content and water to cement ratio of the self-compacting concrete are lower than those of the pumping concrete,but its sand ratio is much higher than that of the pumping concrete.The results show that the workability of the self-compacting concrete is excellent.The strength,elastic modulus,drying shrinkage,anti-permeability to iron chloride,and anti-carbona-tion of the self-compacting concrete are close to those of the pumping concrete in the same strength grade.