干湿循环作用下灌注性水泥砂浆抗硫酸盐侵蚀研究  

Study on resistance to sulfate attack of poured cement mortar under dry and wet cycle

作　　者：马蕾 温勇[1] 张文艺 王超 彭彬 MA Lei;WEN Yong;ZHANG Wenyi;WANG Chao;PENG Bin(School of Architecture and Civil Engineering,Xinjiang University,Urumqi 830047,China)

机构地区：[1]新疆大学建筑工程学院,新疆乌鲁木齐830047

出　　处：《新型建筑材料》2019年第3期36-40,共5页New Building Materials

基　　金：国家自然科学基金项目(51768068)

摘　　要：为了研究半柔性路面灌注性水泥砂浆的抗硫酸盐侵蚀性能,通过干湿循环方法分别研究了水胶比、砂胶比、粉煤灰掺量、硅灰掺量、减水剂掺量对抗折和抗压抗蚀系数的影响。结果表明:浓度为5%的硫酸钠溶液对抗压强度的影响比抗折强度的大;抗折抗蚀系数在干湿循环40次时最大;抗压抗蚀系数在干湿循环30次时开始小于1,说明抗硫酸盐侵蚀性能开始下降;水泥砂浆抗硫酸盐侵蚀性能较好的配比为:水胶比0.5,砂胶比0.2,粉煤灰掺量20%～25%,硅灰掺量2.0%～2.5%,减水剂掺量0.3%。In order to study the resistance to sulfate attack of poured cement mortar for the semi-flexible pavement,the effect of water-binder ratio,sand-binder ratio,fly ash content,silica fume content and superplasticizer dosage on the coefficient of flexural and coefficient of pressure were studied by the wetting-drying test. The results showed that the effect of 5% sodium sulfate solution on compressive strength is greater than that of flexural strength;the coefficient of flexural had a maximum at 40 cycles of wetting and drying cycles;the coefficient of pressure starts to be less than 1 at 30 cycles of wetting and drying cycles,which illustrates the ability to resist sulfate erosion began to decline;The better dosage of cement mortar against sulfate attack is:water-binder ratio 0.5,sand-binder ratio 0.2,fly ash content 20%~25%,silica fume content 2.0%~2.5%,superplasticizer dosage 0.3%.

关 键 词：灌注性水泥砂浆 抗硫酸盐侵蚀 干湿循环 抗蚀系数 

分 类 号：TU578.1[建筑科学—建筑技术科学]