State of the art review on the production and bond behaviour of reinforced geopolymer concrete

Geopolymer is produced through the polymerization of active aluminosilicate material with an alkaline activator,leading to the formation of a green,inorganic polymer binder.Geopolymer concrete(GPC)has become a promising low-carbon alternative to traditional Portland cement-based concrete(OPC).GPC-bonded reinforcing bars offer a promising alternative for concrete structures,boasting excellent geopolymer binder/reinforcement bonding and superior corrosion and high-temperature resistance compared to Portland cement.However,due to differences in the production process of GPC,there are distinct engineering property variations,including bonding characteristics.This literature review provides an examination of the manufacturing procedures of GPC,encompassing source materials,mix design,curing regimes,and other factors directly influencing concrete properties.Additionally,it delves into the bond mechanism,bond tests,and corresponding results that represent the bond characteristics.The main conclusions are that GPC generally has superior mechanical properties and bond performance compared to ordinary Portland cement concrete(OPC).However,proper standardization is needed for its production and performance tests to limit the contradictory results in the lab and on site.

地聚合物胶凝材料,是由活性铝硅酸盐原料和碱性激发剂经聚合反应形成的一种绿色无机胶凝材料。地聚合物混凝土(GPC)被认为是低碳的、有潜力替代传统波特兰水泥混凝土(OPC)的新型建筑材料。地聚合物胶凝材料与筋材之间具有超高的粘结性能;地聚合物具有远超波特兰水泥的优异的抗腐蚀和耐高温性能;因此,GPC与筋材的组合为钢筋混凝土结构构件提供了更优选择。然而,GPC与普通混凝土的生产过程大不相同;包括粘结特征在内的工程性能也存在明显的差异。本文综述了GPC的制造流程,包括源材料、配合设计、养护等直接影响混凝土性能的因素,并深入探讨了针对粘结机理、粘结性能和多种粘结滑移指标开展的相应实验和理论研究结果。本文的主要结论是:GPC具有优于普通波特兰水泥混凝土(OPC)的力学性能和粘结性能。但尚需对其生产和性能测试进一步标准化,以减少目前出现在实验室和施工现场中的各种误差。