Mechanical Properties of Geopolymer-based Coral Aggregate Concrete Under Dry-wet Cycles of Seawater
ZHANG Bai1,2,*, PENG Hui1, YANG Zhiyuan2
1 School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China 2 School of Civil Engineering, Southeast University, Nanjing 210096, China
Abstract: Seawater coral aggregate concrete (CAC), prepared with locally available marine resources (e.g. seawater, sea-sand, and wasted coral aggregates) on reef or island areas, is helpful to shorten construction period and reduce construction costs of offshore projects. However, the porosity and brittleness of coral aggregates will affect the mechanical properties and durability of CAC and CAC structures. In this work, low-carbon and well-durable geopolymers were used instead of ordinary Portland cement to prepare geopolymer-based seawater coral aggregate concrete (GPCAC), and it's mechanical properties and durability under seawater wet-dry cycles were explored, meanwhile the deterioration mechanism of the mechanical properties of the concrete was evaluated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The results indicated that GPCAC exhibited better seawater erosion resistance than CAC after exposure to seawater dry-wet cycle environments. When subjected to 45 ℃ seawater conditions in wet-dry cycles for 12 months, the cubic compressive strength and elastic modulus of CAC were reduced by 9.7% and 8.6%, respectively, while the elastic modulus of GPCAC was only reduced by 6.2%, and even the cubic compressive strength of GPCAC increased by 5.9%. It was concluded that the dense microstructure, excellent pore structure, and stable hydration products of geopolymers are the reasons for their superior performance against seawater corrosion to cement-based materials.
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2024, Vol. 38 
