论文部分内容阅读
本文研究了在干湿循环条件下粉煤灰对混凝土抗冻性能的影响,测试了冻融循环后混凝土的抗压强度和质量损失,利用压汞分析了不同条件下混凝土的孔隙特征及粉煤灰对干湿循环条件下混凝土抗冻性能的影响。结果表明,粉煤灰的掺入量越大,经干湿冻融循环后混凝土的强度损失和质量损失增加,粉煤灰掺量为20%时,混凝土抗干湿冻融循环能力最强。掺20%粉煤灰的混凝土孔隙率比没掺的低,而且孔隙的分形维数也比不掺粉煤灰的混凝土小。
In this paper, the effect of fly ash on the frost resistance of concrete under wet-dry conditions was studied, the compressive strength and mass loss of concrete after freeze-thaw cycles were tested, the pore characteristics of concrete under different conditions were analyzed, Effect of ash on frost resistance of concrete under cyclic wetting and drying conditions. The results show that the greater the fly ash incorporation, the strength loss and the mass loss of the concrete after the freeze-thaw freeze-thaw cycles increase. When the content of fly ash is 20%, the freeze-thaw cycle of concrete is the strongest. The concrete with 20% fly ash has a lower porosity than the non-doped concrete, and the fractal dimension of pores is also smaller than that of concrete without fly ash.