冻融—硫酸盐干湿循环作用下复掺水泥砂浆性能研究

摘要

The propoties of cement mortar mixed with fly ash and slag powder under freezingthawing or wet-dry cycles with salt soaking as well as under both of them were studied.The mass loss ratios,longitudinal relative dynamic elastic modulus,cubic compressive strength and other properties were tested and the optimal ratio was obtained.The results show that the damage to the specimens well be more serious with the increasing of the number of freezing-thawing cycles or wet-dry cycles.The mass loss ratio negatively increases with the increasing of the number of freezing-thawing cycles or wet-dry cycles,while the cubic compressive strength and longitudinal relative dynamic elastic modulus decrease.The behaviors of specimens with mineral admixtures (experimental group) are worse than those without mineral admixtures (control group).The smaller the experimental group's ratio of water to cementation material,the closer the data changing trend of the experimental group and the control group.Under the combined effect of freezing-thawing cycles and wet-dry cycles,the damage to specimens is more serious than that under a single effect,but the changing process is relatively smooth.%探讨了复掺粉煤灰、矿渣在冻融循环、硫酸盐干湿循环以及二者共同作用下的性能.通过研究其质量损失率、相对动弹性模量、抗压强度等力学性能来对复掺比例进行讨论,得出了复合作用下的较优配合比.研究表明:随着循环次数的增加,试块破坏程度逐渐严重,质量损失率出现负增长现象,相对动弹性模量及抗压强度逐渐减小.掺入矿物掺合料的试件组(试验组)性能略差于未掺入矿物掺合料的试件组(对照组),水胶比越小,其试验组与对照组的数据曲线变化趋势越相似.复合作用下,试件的破坏程度相对单一作用下更严重,但是破坏过程相对平缓.