多因素影响再生混凝土性能试验研究

Experimental Study on the Performance of Recycled Aggregate Concrete under Influences of Various Factors

研究了水胶比、再生粗骨料取代率及超细掺合料(粉煤灰、矿粉)掺量对再生混凝土性能的影响。试验结果表明,水胶比W/C为0.35、再生粗骨料取代率在50%时,再生混凝土性能较好;而粉煤灰和矿粉双掺可以充分发挥"微骨料效应"和后期"火山灰效应",细化孔隙结构,提高密实度,改善再生混凝土界面过渡区的微观结构。

The influences of the water-binder ratio （W/C）, replacement of recycled coarse aggregate by mass （RRC） and the super-fine mineral admixtures （fly ash and slag） on the performances of recycled concrete are studied. The experimental results show that the performances of recycled concrete are better when the W/C is 0.35 and RRC is 50%. The resuits also show that the pore structure and the compactness is better, the bond with aggregates and the micro structure of concrete are improved by adding fly ash and slag. Based on this way, the comprehensive macro properties of concrete are improved.