氧化镁膨胀剂对水泥浆体膨胀性能、强度和孔结构的影响  

Influence of Mg O-based Expansive Admixture on Expansion Performance,Compressive Strength and Pore Structure of Cement Paste

作　　者：丁文文[1] 谭克锋[1] 刘来宝[1,2] 唐凯靖[1] 赵翠娇 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]东南大学材料科学与工程学院,江苏南京211189

出　　处：《西南科技大学学报》2017年第1期52-57,共6页Journal of Southwest University of Science and Technology

摘　　要：研究了在20℃和40℃水中养护下,在950℃和1 150℃下制得的氧化镁膨胀剂(MEA)对纯水泥(PC)和掺有质量分数30%粉煤灰水泥(FC)浆体的膨胀性能、抗压强度和孔结构的影响。结果表明:40℃下养护120 d时,掺有MEA质量分数4%在1 150℃下制备的MEA(M300)浆体出现体积安定性不良、强度下降、孔隙率增大;与PC浆体相比,M300对FC浆体强度的影响更明显。The influence of Mg O-based expansive admixture（MEA） prepared at 950 ℃ and 1 150 ℃on expansion performance,compressive strength and pore structure of plain cement（PC） and cement with 30% fly ash（FC） pastes cured in water at 20 ℃ and 40 ℃ was investigated. Results show that there appears unsoundness,a loss of compressive strength and increase of porosity for the pastes with 4%MEA calcined at 1 150 ℃ when cured at 40 ℃ for 120 days. Moreover,the detrimental effect of M300 on compressive strength of FC is more significant compared with PC.

关 键 词：氧化镁 粉煤灰 膨胀 抗压强度 孔结构 

分 类 号：TQ172.7[化学工程—水泥工业]