酸雨侵蚀对水泥砂浆力学性能的影响

Effect of acid rain attack on mechanical properties of cement mortar

研究了不同水胶比、不同胶凝材料的水泥砂浆受酸雨侵蚀后的力学性能变化。结果表明:在酸雨侵蚀条件下,砂浆抗压强度和抗折强度呈现先快速增长,而后迅速降低的趋势,且水灰比越小,强度增长和下降速度越快;粉煤灰掺量越高,56 d以前强度增长越快,56 d以后强度下降速度越缓慢;28 d前掺矿粉砂浆在酸雨中的抗压强度增长幅度高于未掺加矿粉的基准砂浆,且矿渣掺量越高砂浆抗压强度越高,矿粉对砂浆抗折强度的作用相对较小。

The mechanical properties of cement material of various water cement ratio and cement mortar under acid rain stress were studied. The results show that the compressive strength and bending strength of mortar show a rapid increase under acid rain stress, and then decrease ,the strength increases and the decrease rate is faster when the water cement ratio is small.The strength of cement with the increase of fly ash show a rapid growth before 56d and a slow down after 56 d.The compressive strength of mortar with mineral powder increased more than that of control sample under acid rain stress before 28 d, The strength of mortar would be increased with the propor- tions of slag increased , and mineral powder has little effect on the flexural strength of mortar.