材料参数对清水混凝土表观气孔控制的影响

Effect of Material Parameters on the Control of the Apparent Porosity of Fair-faced Concrete

材料参数是影响清水混凝土表观质量的重要因素。本工作采用不同种类的水泥、粉煤灰、粗细骨料和外加剂等组分研究了初始含气量、粗骨料最大粒径、塑性粘度系数、初始屈服应力和泌水率对清水混凝土表观气孔的影响,并分别给出了每种材料参数的适宜范围。此外,基于表面气孔面积率、气孔分布标准差和最大气孔直径三个参数提出了清水混凝土表观气孔评价标准。最后得出,将不同的材料参数调控至相应范围更易制备出表观质量优异的清水混凝土。

The material parameters of fair-faced concrete are important factors that determine its apparent quality.This work uses different types of cement,fly ash,coarse and fine aggregates and additives to study the effects of the initial air content,maximum coarse aggregate particle size,plastic viscosity coefficient,initial yield stress and bleeding rate on the apparent pores of fair-faced concrete.The appropriate range of each material parameter is given separately.In addition,based on the three parameters of the surface pore area ratio,pore distribution standard deviation and maximum pore diameter,the apparent pore evaluation standard of fair-faced concrete is proposed.Finally,fair-faced concrete with excellent apparent quality can be obtained by adjusting the material parameters to the corresponding range.