低塑性多孔水泥混凝土基层配合比设计

Mixture Design of Plastic Porous Cement Concrete for Urban Highway Base

摘要:

针对城市道路排水基层水泥混凝土施工的特殊要求,掺加粉煤灰、高效减水剂等配制具有高流动性的多孔水泥混凝土.提出低塑性多孔水泥混凝土的设计强度标准和建议级配,并对室内试件的成型方法进行探讨.在多孔水泥混凝土的组成设计中考虑了粉煤灰掺量、高效减水剂掺量和水灰比等多个因素,通过室内试验,分析了这些因素对多孔水泥混凝土坍落度、孔隙率和强度的影响规律.在此基础上,根据建议的配合比设计标准,提出低塑性多孔水泥混凝土的组成.

Abstract:

Low-plastic porous cement concrete,a high-fluid porous cement concrete,is doveloped for special requirements of base construction in urban highway.The paper presents the strength standard of design and suggested gradation for the low-plastic porous cement concrete,and also a discussion of the molding method of sample in the laboratory.When designing the low-plastic porous cement concrete,many factors should be considered such as fly ash addition,efficient water reducing agent addition and water-cement ratio and so on.An analysis is made of the effect of these factors on the slump,void and strength of low-plastic porous cement concrete.Based on the research,the component of low-plastic porous cement concrete is proposed.