碳化作用对水泥砂浆力学性能的影响研究

Study on influence of carbonation on mechanical properties of cement mortar

通过测定不同碳化龄期下,水灰比0.4,0.5和0.6的普通硅酸盐水泥砂浆试块和高抗硫酸盐水泥砂浆试块的相对动弹性模量和抗折抗压强度,研究了碳化作用下水泥砂浆的损伤规律。试验结果表明,在一定的碳化龄期内,水泥砂浆试块的相对动弹性模量和抗折抗压强度均随着碳化时间的增加而增加,但其增长速率呈减缓趋势;各水灰比的水泥砂浆试块碳化28d后,其抗压强度比未碳化时提高40%~50%;最大抗折强度比未碳化时提高20%~30%;普通硅酸盐水泥比高抗硫酸盐水泥具有较好的抗碳化性。

By measuring the relative dynamic elastic modulus,flexural strength and compressive strength of ordinary Portland cement mortar specimen and high sulfate resistant cement mortar specimen with 0. 4,0. 5 and 0. 6 water cement ratio at different carbonation age,the damage law of cement mortar under the influence of carbonation was studied. The results show that,within certain period of carbonation,the relative dynamic elastic modulus and compressive strength of cement mortar increase with the increase of carbonization time,but the growth rate slows down;After carbonation for 28 days,the compressive strength of cement mortar increases by 40% ~ 50% than those without carbonation,the maximum flexural strength increases by 20% ~ 30% than those without carbonation; The ordinary Portland cement has better resistance to carbonation than high sulfate resistant cement.