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地聚合物混凝土是一种绿色低碳的新型建筑材料,因其耐高温、高早强、低反应热等特点,近十年受到了国际学术界和工程界的广泛关注。在与普通混凝土进行对比的基础上,通过钢筋拉拔试验研究了地聚物混凝土与钢筋的黏结性能,探讨了黏结长度等参数对黏结性能的影响。研究表明:与普通混凝土相比,地聚合物混凝土可以更好地传递钢筋的应力;传递相同的荷载,地聚合物混凝土比普通混凝土需要更小的混凝土保护层厚度和黏结长度;钢筋在地聚合物混凝土中的锚固性能具有加载速率敏感性,随着加载速率的提高,地聚合物混凝土与钢筋的黏结强度、破坏能耗均显著提高,但该敏感性随着黏结长度的增大而减弱。在分析试验数据基础上,提出了地聚合物混凝土与钢筋黏结强度的表达式,并提出了地聚合物混凝土结构设计建议。
Geopolymer concrete is a kind of green and low-carbon new building material. Due to its characteristics of high temperature resistance, high early strength and low reaction heat, geopolymer concrete has drawn wide attention from international academia and engineering field in recent ten years. Based on the comparison with ordinary concrete, the bond behavior between geopolymer concrete and steel bar was studied by the pullout test of steel bar, and the influence of bonding length and other parameters on the bond performance was discussed. The results show that, compared with ordinary concrete, geopolymer concrete can better transfer the stress of steel bar. When the same load is transmitted, polymer concrete requires less thickness and length of concrete cover than common concrete. The anchorage performance of concrete has load-rate sensitivity. With the increase of loading rate, the bond strength and energy consumption of geopolymer-reinforced concrete significantly increase, but the sensitivity decreases with the increase of bond length. Based on the analysis of experimental data, the expression of bond strength between geopolymer and rebar is proposed, and the design proposal of geopolymer concrete structure is proposed.