改性再生粗骨料对再生混凝土力学性能的影响

Influence of Modified Recycled Coarse Aggregate on the Mechanical Properties of Recycled Concrete

研究粒径16~19 mm内的改性再生粗骨料替代天然粗骨料对再生混凝土力学性能的影响,采用高强砂浆裹浆处理再生粗骨料进行改性,将天然混凝土作为对照组,以替代率为0%、10%、20%、30%、40%、50%、60%、70%、80%、90%、100%的等质量替代天然粗骨料配制11种C30混凝土,对不同替代率下的再生混凝土试块进行抗压和劈裂拉伸试验。结果表明:当裹浆再生粗骨料替代率分别为20%、80%时对应的再生混凝土抗压和劈裂拉伸强度达到最大。

To study the influence of modified recycled coarse aggregates within particle size of 16 mm~19 mm replacing natural coarse aggregates on the mechanical properties of recycled concrete,high-strength mortar wrapped slurry is used to treat the recycled coarse aggregate for modification.Natural concrete is taken as the control group,and there are 11 kinds of C30 concrete prepared by substituting the natural coarse aggregate with the same quality at the replacement rate of 0、10%、20%、30%、40%、50%、60%、70%、80%、90%、100%.Thus the compression and splitting tensile tests of recycled concrete samples with different replacement rates are carried out.The results show that the compression strength and splitting tensile strength of recycled concrete reach the maximum when the replacement rate of recycled coarse aggregate is 20%and 80%,respectively.