再生粗骨料和矿物掺合料对再生混凝土抗冻性影响的研究

试验研究了不同再生粗骨料取代率对再生混凝土抗冻性的影响,并且以再生粗骨料取代率为100%的再生混凝土作为基准混凝土,分别研究单掺钢渣粉、硅灰以及复掺钢渣粉、硅灰对再生混凝土抗冻性的影响。试验分别从表观特征、质量损失率、相对动弹性模量和抗压强度来分析。试验结果表明:随着钢渣掺量的增多再生混凝土的抗冻性降低;硅灰明显的提高再生混凝土的抗冻性,掺量5%为宜;复掺钢渣和硅灰不同的比例对再生混凝土的抗冻性影响不同,得到复掺硅灰5%+钢渣15%再生混凝土的抗冻性优于基准混凝土。

Study on effect of recycled coarse aggregate and mineral admixture on frost resistance of recycled concrete

The paper studied the effect of different recycled coarse aggregate replacement ratio on the frost resistance of recycled concrete.It took the recycled concrete with 100% recycled coarse aggregate concrete as basic concrete to respectively research the effect of steel slag powder and silica fume on the frost resistance of recycled concrete from the respects of appearance features, mass loss rate, the relative dynamic elastic modulus and compressive strength.The results show that with the increase of steel slag content, the frost resistance of recycled concrete decreases; The silica fume can obviously improve the frost resistance of recycled concrete, and the reasonable content of silica fume is 5%;the different ratios of silica fume and steel slag have different influences on the frost resistance of recycled concrete.When the silica fume content is 5% and the steel slag content is 15% in recycled concrete, the frost resistance of recycled concrete is higher than that of basic concrete.