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为研究方钢管与再生混凝土界面粘结滑移性能,以再生粗骨料取代率、再生混凝土强度等级及膨胀剂掺量为变化参数,进行了方钢管再生混凝土试件的推出试验,获取了试件的荷载-滑移曲线,分析了各变化参数对粘结强度的影响。在验证相关粘结强度计算模型适用性的基础上,拟合出方钢管再生混凝土的粘结强度计算公式。研究结果表明,方钢管再生混凝土荷载-滑移曲线具有相似性,均经历了四个阶段,滑移首先出现在加载端,随后发展到自由端;粘结强度随再生粗骨料取代率增大而降低,但影响较小;粘结强度随再生混凝土强度等级提高而增大,但增速趋缓;膨胀剂掺量对粘结强度影响明显,粘结强度随着膨胀剂掺量(0~15%范围内)增加呈现出先增大后降低的趋势。
In order to study the interfacial adhesion and slippage between square steel tube and recycled concrete, the test of recycled aggregate concrete with square steel tube was carried out based on the replacement ratio of recycled coarse aggregate, the strength grade of recycled concrete and the content of expansive agent. Piece load-slip curve, the impact of various parameters on the bond strength was analyzed. On the basis of verifying the applicability of the calculation model of the related bond strength, the formula for calculating the bond strength of square steel tube recycled concrete is fitted. The results show that the load-slip curves of square steel tube recycled concrete have similarities and all have experienced four stages. The slip occurs first at the loading end and then to the free end. The bond strength increases with the replacement rate of recycled coarse aggregate But the influence is smaller; the bond strength increases with the increase of the strength level of recycled concrete, but the growth rate slows down; the amount of expansion agent has a significant effect on the bond strength, the bond strength increases with the dosage of expansive agent (0 ~ 15% range) showed an increase first and then decrease.