摘要
采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH 560)对偏高岭土基地聚合物进行改性,研究了KH 560用量对改性地聚合物制备的砂浆试件抗压强度、抗折强度、抗冻性能、抗硫酸盐腐蚀性能和结构密实程度的影响,并利用扫描电子显微镜、红外光谱、介孔分析等手段表征了产物结构。结果表明,添加适量KH 560能提高偏高岭土基地聚合物的抗压强度、抗折强度、抗冻性能、抗硫酸盐腐蚀系数和结构密实程度。对于KH 560改性地聚合物来说,随着KH 560用量从1%增至4%,抗压强度和抗折强度均逐渐降低,100次冻融循环后的质量损失率和抗压强度损失率升高,干湿循环28 d后的质量损失率升高、抗硫酸盐腐蚀系数降低,总孔容升高,介孔平均直径增大,结构的密实程度降低;当KH 560用量为1%时,改性地聚合物的耐久性能较佳,抗压强度为43.52 MPa,抗折强度为6.98 MPa, 100次冻融循环后质量损失率为4.47%、抗压强度损失率为17.76%,干湿循环28 d后的质量损失率为0.75%、抗硫酸盐腐蚀系数为0.93,总孔容为0.142 cm^(2)/g,介孔平均直径为7.003 nm。
γ-glycidyl ether oxypropyl trimethoxysilane(KH 560) was used to modify the metakaolin based geopolymer. The effects of KH 560 on the compressive strength, flexural strength, freeze-thaw resistance, sulfate corrosion resistance and structural compactness of mortar specimens prepared from the modified geopolymer were investigated, and the inner structures were characterized by SEM, FT-IR and mesoporous analysis. The results showed that the appropriate amount of KH 560 could improve the compressive strength, flexural strength, freeze-thaw resistance, sulfate corrosion resistance coefficient and structural compactness of metakaolin based geopolymer. For the KH 560 modified geopolymer, the compressive strength and flexural strength decreased gradually as the amount of KH 560 increased from 1% to 4%, the mass loss rate and compressive strength loss rate increased after 100 times freeze-thaw cycles, the mass loss rate increased after 28 days of dry and wet cycles, the sulfate corrosion resistance coefficient decreased, the total pore volume increased, the average diameter of mesopores increased, and the compactness of the structure decreased. When the amount of KH 560 was 1%, the durability of modified geopolymer was better, the compressive strength was 43.52 MPa and the flexural strength was 6.98 MPa, the mass loss rate after 100 freeze-thaw cycles became 4.47%, the compressive strength loss rate was 17.76%, the mass loss rate was 0.75% after 28 d of dry and wet cycles, the sulfate corrosion resistance coefficient was 0.93, the total pore volume was 0.142 cm^(2)/g, and the average diameter of mesopores was 7.003 nm.
作者
冯博文
刘杰胜
陈耀华
魏靖
付弯弯
张曼
谭晓明
FENG Bowen;LIU Jiesheng;CHEN Yaohua;WEI Jing;FU Wanwan;ZHANG Man;TAN Xiaoming(School of Civil Engineering and Architecture,Wuhan Polytechnic University,Wuhan 430023,Hubei)
出处
《有机硅材料》
CAS
2023年第1期8-13,24,共7页
Silicone Material
基金
湖北省自然科学基金(No.2021CFB583)
湖北省教委科研基金(B2020064)。
