Abstract
Chloride attack in the marine environment adversely affects the durability of ordinary Portland cement-sulfoaluminate cement-ground granulated blast furnace slag (OPC-SAC-GGBFS) repair materials, leading to the premature failures of repair engineering. In this research, CaLiAl-LDHs (CLA-LDHs) was synthesized by a modified co-precipitated method, and the characterisation and adsorption behaviour for chloride ions were investigated. In addition, the impact of the synthesized CLA-LDHs on the mechanical properties, chloride binding capacity and hydration process of OPC-SAC-GGBFS repair materials were systematically researched. The obtained results revealed that the adsorption capacity of CLA-LDHs for chloride ions was 41.47 mg/g, and the adsorption process conformed better to the quasi second-order model and Langmuir isotherm model. The chloride binding capacity of OPC-SAC-GGBFS was enhanced by adding CLA-LDHs, mainly due to the formation of more FS/LDHs-Cl. Furthermore, the addition of CLA-LDHs promoted the early hydration of OPC-SAC-GGBFS, shortened the setting time, improved the early mechanical properties, but slightly reduced the mechanical properties at 28 d. It is noteworthy that the mechanical properties of OPC-SAC-GGBFS at −10 °C was significantly enhanced by CLA-LDHs.
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