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利用珊瑚砂取代天然河砂进行混凝土的配合比设计,系统研究了珊瑚砂混凝土的抗折强度、抗压强度、劈裂抗拉强度、干燥收缩以及早期抗开裂性能,同时用相同配合比参数的河砂混凝土进行对比。此外,还对珊瑚砂混凝土的抗氯离子渗透性、抗碳化性等耐久性以及水化产物的微观结构进行了分析。试验结果表明,珊瑚砂混凝土的抗压强度要低于河砂混凝土,而抗折强度、劈裂抗拉强度则相差不大;珊瑚砂混凝土的干燥收缩性能、早期抗开裂性能、抗氯离子渗透性以及抗碳化性均要好于河砂混凝土。珊瑚砂混凝土和河砂混凝土的28d水化产物基本相同,都含有Ca(OH)_2,钙矾石AFt,CaCO_3和C-S-H凝胶。珊瑚砂由于其凸凹多孔,使得其界面过渡区的黏结力要大于河砂混凝土,这极大改善了其界面的结构性能。
Replacing natural river sand with coral sand to design the concrete mix ratio, the flexural strength, compressive strength, splitting tensile strength, drying shrinkage and early crack resistance of coral sand concrete were systematically studied. At the same time, River sand concrete contrast. In addition, the durability of coral sand concrete against chloride ion permeability, anti-carbonization and the microstructure of hydration products were also analyzed. The test results show that the compressive strength of coral sand concrete is lower than that of river sand concrete, while the flexural strength and splitting tensile strength are not different. The dry shrinkage, early cracking resistance, chloride resistance Sexual and carbonation are better than river sand concrete. The 28d hydration products of coral sand concrete and river sand concrete are basically the same, and both contain Ca (OH) 2, ettringite AFt, CaCO 3 and C-S-H gels. Coral sand because of its convex and concave porous, making the interface transition zone of the adhesive force is greater than the river sand concrete, which greatly improves the structural properties of the interface.