不同龄期珊瑚海水海砂混凝土单轴受压力学性能研究OA

In order to explore the mechanical properties of coral seawater and sea-sand concrete(CSSC)under uniaxial compression at different ages,nine standard cube specimens and nine cylinder specimens were designed and manufactured with age as the variable parameter,and the cube compressive and axial compressive tests were carried out respectively.The failure modes of the specimens were observed,and the compressive stress-strain curves of CSSC were obtained.The effects of age on the compressive strength,axial compressive strength and axial compressive stiffness of CSSC cubes were analyzed.The test results show that CSSC exhibits high early strength,and at 7 days,the cube compressive strength and axial compressive strength reach 87.85%and 70.58%of their corresponding 28-day values,respectively.By 14 days,the compressive strength has essentially reached the 28-day level,after which the rate of strength development slows down.The axial compressive stiffness of CSSC shows an increasing-then-decreasing trend with curing age,reaching a maximum at 14 days;at 28 days,it becomes comparable to that of ordinary concrete.Based on the experimental results,the conversion formula of CSSC axial compression-cube compressive strength at different ages was proposed,and the uniaxial compression constitutive equation of CSSC was established.