硫酸盐浓度对水泥基材料侵蚀的影响研究

硫酸盐对水泥基材料的侵蚀问题备受工程界和学术界关注。通过测定混凝土胶砂试件在不同浓度硫酸盐侵蚀下的抗折抗蚀系数,并结合微观测试,观察侵蚀产物种类及计算生成量,以探究不同浓度硫酸盐对水泥基材料侵蚀的影响。结果表明,SO^2-4浓度为20000 mg/L时的侵蚀速率分别是8000、4000、800 mg/L的1.78、2.46、3.77倍。SO^2-4浓度为800 mg/L时,钙矾石生成量是石膏的1.4倍;SO^2-4浓度为8000 mg/L时,钙矾石与石膏生成量相同;SO^2-4浓度为20000 mg/L时,石膏生成量是钙矾石的2.5倍。

Effect of Sulfate Concentration on the Erosion of Cement-based Materials

The erosion of cement-based materials by sulfate has attracted much attention in engineering and academic circles.By measuring the corrosion resistance coefficient of concrete cementitious sand specimen under the erosion of different sulfate concentration,and combining with the microscopic test,the type of corrosion products is observed and the production amounts are calculated to explore the influence of different concentration of sulfate on the erosion of cementitious materials.The results show that the erosion rate of concrete cementitious sand specimen when the SO^2-4 concentration is 20000 mg/L is 1.78,2.46 and 3.77 times to those under the SO^2-4 concentration of 8000 mg/L,4000 mg/L and 800 mg/L respectively.When the concentration of SO^2-4 is 800 mg/L,the yield of ettringite is 1.4 times that of gypsum.When the concentration of SO^2-4 is 8000 mg/L,the ettringite and gypsum produce the same amount.When the concentration of SO^2-4 is 20000 mg/L,the production of gypsum is 2.5 times that of ettringite.