复掺粉煤灰和硅灰对混凝土抗氯离子渗透性和抗冻性的影响研究

Study of effects on chloride resistance to ion penetration and frost of concrete mixed with fly ash and silica fume

通过试验研究了复掺粉煤灰和硅灰对混凝土抗氯离子渗透性能和抗冻融性能以及综合考虑两个方面对混凝土耐久性的影响。试验结果表明:复掺粉煤灰和硅灰能大幅度提高混凝土的抗氯离子渗透性能,最小能提高51.3%,同时会降低其抗冻融性能,但降低幅度不是很大,相对动弹模最大仅降低12.5%,因此综合评价其对耐久性的影响,复掺粉煤灰和硅灰还是能较大程度的提高混凝土的耐久性。

The tests researched the chloride ion penetration and anti-freeze of concrete mixed with fly ash and silica fume and into account two aspects of performance and durability of concrete by experiments.The results showed that：complex of fly ash and silica fume can greatly improve resistance to chloride ion penetration of concrete,minimal to increase 51.3%,and it will reduce its resistance to freeze-thaw performance,but reduce the magnitude is not large,the maximum relative dynamic elastic modulus only 12.5% reduction,so evaluation of the impact on the durability,fly ash and silica fume complex can improve a greater degree of durability of concrete.