海水拌养珊瑚礁砂混凝土抗压强度试验研究

Experimental Study on Compressive Strength of Coral Aggregate Concrete Mixed with Seawater

为研究海水拌养珊瑚礁砂混凝土的抗压强度,对不同龄期(3d、7d、14d、21d、28d)立方体试块的单轴抗压强度进行测试,并探究水泥类型、水灰比等因素对礁砂混凝土强度的影响,试验结果表明:礁砂混凝土抗压强度变化规律表现与普通碎石混凝土一致,抗压强度极限值随水灰比减小而增加,水泥标号越高,极限抗压强度越高,矿渣硅酸盐混凝土强度最低,珊瑚礁砂混凝土在实际工程应用中宜采用标号为425号及以上的水泥类型。

The performance of the coral reef sand concrete mixed and cured by the seawater is significant to the construction of islands and reefs in the South China Sea.In order to study the compressive strength of those concrete samples,the uniaxial compressive strength of 100×100×100mm test cubes under different ages（3d,7d,14 d,21d,28d）were tested,and the cement types,water-cement ratio and other factors that might affecting the strength of concrete were explored.The results indicated that,the performance of coral sand concrete cube compressive strength variation is consistent with the ordinary gravel concrete.The range of the compressive strength increases with the decrease of water-cement ratio;and the higher the cement grade,the higher the ultimate compressive strength is.With the same strength index,the mix design with Portland cement has the lowest strength.In the practical coral reef construction engineering,a strength index of 425 should be used.