掺粉煤灰和引气剂混凝土渗透性与强度的关系

Permeability of Concrete with Fly Ash and AEA and Its Relation with Strength

关键词:  普通混凝土  粉煤灰混凝土  渗透系数  引气混凝土  抗压强度  引气剂  强度等级  抗渗性能  渗透性

Key words:  fly ash(FA),air entraining agent(AEA),permeability,strength,correlation

摘要:

与同强度等级的普通混凝土相比，掺粉煤灰混凝土的28d渗透系数较高，而90d渗透系数较低；混凝土引气后其抗渗性能有较大幅度的提高．在分析了各种类型混凝土的渗透系数与抗压强度之间的相关性后发现：普通混凝土抗压强度与渗透系数的线性相关性较好，而粉煤灰混凝土、引气混凝土及粉煤灰引气混凝土抗压强度与渗透系数的线性相关性相对较差。

Abstract:

The 28 d permeability coefficient of fly ash concrete is higher than that of ordinary concrete at equal strength, but the 90 d permeability coefficient of fly ash concrete is lower than that of ordinary concrete at equal strength. The resistance to permeation of air-entrained concrete and fly ash concrete is improved remarkably. For all types of concrete studied in this paper, their permeability and compressive strength are related to each other. The linear correlation between permeability and compressive strength for ordinary concrete is good, and that for fly ash concrete, air-entrained concrete or fly ash air-entrained concrete is not as good.