弯曲荷载作用下硫酸盐侵蚀对水泥基材料的力学性能影响

The Influence of Sulfate Attack on the Mechanical Properties of Cement-Based Materials under Bending Load

摘要: 为考察弯曲荷载作用下硫酸盐侵蚀对水泥基材料性能的影响，本文设计了净浆、砂浆试件，研究硫酸盐侵蚀30 d、60 d、90 d、120 d、150 d后的抗折强度与抗压强度变化规律。研究发现：随着硫酸盐侵蚀时间的增加，水泥基材料抗折强度与抗压强度总体呈现先增大后减小的趋势，侵蚀150天时P、AM、BM、CM试件抗折强度损失系数分别为0.27、1、0.83、1.05，抗压强度损失系数分别为0.66、1.03、1、0.79。弯曲荷载加剧了硫酸盐侵蚀，40%的弯曲荷载加速效果比20%的更为显著，20%弯曲荷载加速效果又大于0%。

Abstract: To investigate the influence of sulfate attack on the performance of cement-based materials under bending load, this paper designed paste and mortar specimens and studied the variation laws of flexural and compressive strengths after 30 d, 60 d, 90 d, 120 d and 150 d of sulfate attack. The research found that with the increase of sulfate attack time, the flexural and compressive strengths of cement-based materials generally showed a trend of first increasing and then decreasing. After 150 days of erosion, the flexural strength loss coefficients of P, AM, BM and CM specimens were 0.27, 1, 0.83 and 1.05 respectively, and the compressive strength loss coefficients were 0.66, 1.03, 1 and 0.79% respectively. Bending load aggravated the sulfate attack, and the acceleration effect of 40% bending load was more significant than that of 20%, and the acceleration effect of 20% bending load was greater than that of 0%.