再生混凝土强度指标之间换算关系的研究

Study on Relationships between Strength Indexes of Recycled Concrete

研究分析了再生粗集料不同取代率对再生混凝土各种强度指标的影响.通过试验数据的统计回归,初步得出了再生混凝土立方体抗压强度与其他强度指标之间的换算关系.试验表明,再生混凝土的抗压强度较普通混凝土低,但其抗折强度与普通混凝土相差不大,再生混凝土各种强度指标之间的换算关系与普通混凝土不同.最后,针对再生粗集料取代率为100%的C20～C40再生混凝土主要强度指标的取值提出了建议.

The influence of different recycled coarse aggregate (RCA) replacement ratios on the strength of recycled concrete was investigated. Based on the data regression, the relationships between the cube compressive strength and other strengths are obtained. It is shown that the compressive strength of recycled concrete is lower than that of normal concrete, while the flexural strength is only marginally less compared to normal concrete and the interrelationship of strength indexes for recycled concrete is different from that of normal concrete. Finally, some basic strength indexes of C20-C40 recycled concrete with 100% RCA are proposed.