SO_4~(2-)存在下水泥基复合材料力学性能研究

以内掺复合掺合料、中砂、细石、普通硅酸盐水泥以及抗硫水泥制成的细石高性能混凝土作为研究对象,在硫酸盐溶液中进行一百次干湿循环后,以抗折强度和抗压强度的变化来说明硫酸盐侵蚀对混凝土耐久性的影响.结果说明:混凝土试件的抗折强度比抗压强度更敏感,能够更好地反映混凝土试件的破坏程度;在干湿交替的水侵蚀环境中,不宜采用普通水泥混凝土和抗硫酸盐水泥混凝土;在干湿交替的硫酸盐侵蚀环境中,不宜采用普通水泥混凝土.在硫酸跟浓度小于5000mg/L的硫酸盐侵蚀环境中,可以选择使用抗硫酸盐水泥混凝土;在干湿交替的水侵蚀和硫酸盐侵蚀环境中,加入复合掺和料的混凝土能够更好地发挥抵制恶劣环境的作用.通过硫酸盐侵蚀机理分析说明:加入辅助胶凝材料能够有效的提高盐渍土地区混凝土抵抗硫酸盐侵蚀的能力.

Study on The Mechanics of Cement-based Material in Sulfate Environment

Describes a study carried out to examine the performance of various high performance minute stone concrete,they are made up of compound admixtures,riddled sand,minute stone,portland cement concrete and resist-sulfur cement concrete.They experienced 100 wetting-dry cycle in sodium sulfate solution.The parameters in the durability performance of concrete were the break strength and the compressive strength.The results show that the flexural strength of concrete is more sensitive than the compressive strength and it can better reveal the destroy grade of the concrete.In the alternation of wetting-dry water corrosion environment,the Portland cement concrete and the anti-sulfate cement concrete are not suitably used;In the alternation of wetting-dry sulfate corrosion environment,the Portland cement concrete is not suitably used.In the sulfate corrosion environment with the density smaller than 5000mg/L,the anti-sulfate cement concrete may be used;In the alternation of wetting-dry water corrosion and in the sulfate corrosion environment,the concrete with composite additive displays the well function to the resisting adverse circumstance.By analyzing sulfate corroding mechanism,the results show that composite additive can improve the concrete repellence in salt region to sulfate environment effectively.