酸雨对建筑砂浆性能的影响

The Influence of Acid Rain on the Performance of Building Mortar

目的对腐蚀后砂浆试块进行定量分析,找出酸雨对建筑砂浆力学性能的影响规律.方法在pH1.0、2.5、4.0和腐蚀10 d、20 d、40 d、60 d的变量下,对砂浆试块表观变化、质量变化、抗压强度和剪切强度进行研究分析.结果腐蚀前后砂浆试块表观变化明显;pH1.0组砂浆试块质量、抗压强度、剪切强度在腐蚀时间内一直处于下降趋势.pH2.5与pH4.0组砂浆试块在腐蚀时间内质量、抗压强度、剪切强度均呈现由升转降的趋势,且pH2.5组下降时间点早于pH4.0组.结论酸雨侵蚀对建筑砂浆外观、质量、抗压强度与剪切强度等性能的影响较为显著.

To find out the influence law of acid rain on the mechanical properties of the building mortar, the test block are quantitatively analyzed after be corroded. The mortar test blocks are stud- ied and analyzed for the changes of its apparent, mass, compressive strength and shear strength when the variable of pH is 1.0,2.5 and 4. 0 and the corrosion time is 10 d,20 d,40 d and 60 d. The result showed that the apparent change of the mortar test block is obvious after be corroded. For pHI. 0 group, the mortar test blocks＇ mass, compressive strength and shear strength has been in a downward trend during the corrosion time. However, the mass, compressive strength and shear strength of the mortar test block showed the trend of rising and falling at pH2. 5 and pH4. 0 group during the corrosion time, and the curve of pH2. 5 group drops earlier than that of pH4. 0 group. The effect of acid rain on the appearance, mass, compressive strength and shear strength of the building mortar is more significant.