碱激发矿渣-粉煤灰胶凝材料的风化性能  

Efflorescence of Slag-Fly Ash Based Alkali-Activated Cements

作　　者：吴博 马雪[1] 郑召 王顺风[1,2] 何流 Wu Bo;Ma Xue;Zheng Zhao;Wang Shunfeng;He Liu(School of Material Science and Engineering,Southwest University of Science and Technology,Mianyang,Sichuan 621010;School of Material Science and Engineering,Tongji University,Shanghai 201804;Sichuan Huashi Green Homeland Building Materials Co.,Ltd.,Chengdu,Sichuan 610051)

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]同济大学材料科学与工程学院,上海201804 [3]四川华西绿舍建材有限公司,四川成都610051

出　　处：《非金属矿》2020年第1期6-10,共5页Non-Metallic Mines

基　　金：四川省教育厅重点项目（17ZA0395）;龙山学术人才科研支持计划项目（18LZX609）

摘　　要：通过优化粉煤灰掺量、激发剂种类以及水玻璃模数,研究了其对碱激发矿渣-粉煤灰胶凝材料(AACs)风化性能的影响。结果表明:风化作用会引起AACs表面孔隙率、最可几孔径增大。水玻璃激发纯矿渣AACs孔隙率最低为2.9%,其抗压强度在加速风化7 d后由126.9 MPa下降至62.2 MPa;增大粉煤灰替代率(0~60%),可以有效抑制风化。水玻璃模数介于1.0~1.4,最可几孔径控制在7.58 nm以内。以NaOH溶液为激发剂的AACs,总孔隙率高于30%,结构中多害孔体积增大,为Na+的快速浸出提供通道,试样表面形成较多的Na2CO3·7H2O风化产物,且风化前后抗压强度均低于20 MPa。The effects of the content of fly ash,sodium silicate modulus and types of the alkali-activated activator on efflorescence of AACs were investigated in this paper.The results show that the efflorescence can lead to the surface porosity and the most probable apertures of AACs increase.The minimum porosity of slag-based AACs activated by sodium silicate is about 2.9%,and their compressive strength decreased from 126.9 MPa to 62.2 MPa after accelerated efflorescence for 7 days.When the substitution rate of fly ash improve from 0 to 60%,the efflorescence would be controlled effectively.Furthermore,when the modulus of sodium silicate ranged between 1 and 1.4,the probable apertures sizes of ACCs were less than 7.58 nm.However,the maximal total porosity of the specimens activated by sodium hydroxide solution were above 30%,and the volume of much harm pores increased.These pores were used as fast tracks for translating Na+,so those such much Na2CO3·7H2O as efflorescence products were formed on the surface.The compressive strength of the specimen was less than 20 MPa before and after efflorescence.

关 键 词：粉煤灰 碱激发 胶凝材料 风化 抗压强度 

分 类 号：TB321[一般工业技术—材料科学与工程]