装配式防浪墙用清水混凝土配制与应用研究

Research on preparation and application of clear water concrete for prefabricated wave walls

为研究应用于装配式防浪墙的清水混凝土,进行了C60清水混凝土系列试验研究。配合比设计得到C60清水混凝土基础配合比、矿粉掺量试验研究对性能影响及最佳掺量值、黏度改性掺合料试验研究对清水混凝土性能影响,对应用技术特点做相关分析。结果表明:(1)基础配合比为m(水泥)∶m(矿粉)∶m(黏度改性掺合料)∶m(机制砂)∶m(碎石)∶m(减水剂)∶m(水)=440∶50∶80∶700∶1 015∶0.35∶160。(2)矿粉掺量增加,扩展度先增大后减小,氯离子扩散系数、电通量均逐渐降低,矿粉最佳掺量70 kg/m^(3)。(3)黏度改性掺合料掺量增加,坍落度、扩展度均先增大后减小;28 d抗压强度先增大后减小;劈裂抗拉强度先增大后减小;氯离子扩散系数先增大后减小;电通量先减小后增大,确定最佳掺量90 kg/m^(3)。

In order to study the application of plain concrete in prefabricated wave walls,a series of C60 plain concrete tests were conducted.Obtain the C60 plain concrete foundation mix proportion through mix design.Experimental study on the effect of mineral powder dosage on performance and the optimal dosage value.Experimental study on the effect of viscosity modified admixtures on the performance of plain concrete.Conduct relevant analysis on the characteristics of application technology.The results show that(1)Basic mix ratio is m(cement)∶m(mineral powder)∶m(viscosity modified admixture)∶m(mechanism sand)∶m(crushed stone)∶m(water reducing agent)∶m(water)=440∶50∶80∶700∶1 015∶0.35∶160;(2)As the content of mineral powder increases,the expansion degree first increases and then decreases,and the diffusion coefficient and electrical flux of chloride ions gradually decrease.The optimal dosage of mineral powder is 70 kg/m^(3);(3)As the content of viscosity modified admixture increases,the slump and expansion first increase and then decrease.The compressive strength at 28 days first increases and then decreases.The splitting tensile strength first increases and then decreases.The diffusion coefficient of chloride ions first increases and then decreases.The electrical flux first decreases and then increases.The optimal dosage is determined to be 90 kg/m^(3).