机制砂岩性与级配对混凝土抗硫酸盐侵蚀性能的影响

为了探究不同岩性、不同级配机制砂对混凝土性能的影响,对三种不同岩性机制砂混凝土及天然河砂混凝土的工作性和抗压强度进行研究。此外,对比分析了四种混凝土在干湿循环制度下的抗硫酸盐侵蚀性能。结果表明,天然河砂混凝土的工作性优于机制砂混凝土,钙质机制砂混凝土的工作性略好于硅质机制砂混凝土。机制砂混凝土的抗压强度优于天然河砂混凝土,在硫酸盐侵蚀循环作用下的力学性能变化趋势与天然河砂混凝土基本一致。在相同级配条件下,机制砂混凝土的抗蚀系数高于天然河砂混凝土;机制砂岩性并不会对混凝土抗硫酸盐侵蚀性能带来负面影响。级配良好的机制砂可以增强混凝土抗压强度和抗硫酸盐侵蚀性能。

Effects of Manufactured Sand Lithology and Gradation on Sulfate Resistance of Concrete

In order to explore the effects of different lithology and gradations of manufactured sand on concrete properties, the workability and compressive strength of three different lithological manufactured sand concrete and natural river sand concrete were carried out. In addition, the sulfate resistance of four types of concrete under the dry-wet cycle system was compared and analyzed. The results show that the workability of natural river sand concrete is better than that of manufactured sand concrete, and the workability of calcareous manufactured sand concrete is slightly better than that of siliceous manufactured sand concrete. The compressive strength of manufactured sand concrete is better than that of natural river sand concrete and the change trend of mechanical properties of manufactured sand concrete under the action of sulfate attack cycle is basically the same as that of natural river sand concrete. Under the same gradation conditions, the corrosion resistance index of manufactured sand concrete is higher than that of natural river sand concrete; the lithology of manufactured sand does not negatively affect the sulfate resistance of concrete. Well-graded manufactured sand can enhance compressive strength and sulfate resistance of concrete.