摘要
以酵母菌为原材料,制备出一种用于泡沫混凝土的生物基发泡剂,即以自制微生物发泡剂为基础发泡剂,复掺不同表面活性剂(十六烷基三甲基溴化铵(CTMAB)和十二烷基磺酸钠(CAS)),分别研究复配前后发泡剂的泡沫性能和微观结构。结果表明:微生物-0.7%CAS复合型发泡剂与单一0.7%CAS发泡剂相比,发泡倍数提高7.5%,1 h沉降距和1 h泌水率分别降低9.4%和1.5%,微生物-0.5%CTMAB复合型发泡剂与单一0.5%CTMAB发泡剂相比,发泡倍数提高33.4%,1 h沉降距和1 h泌水率分别降低88.9%和9.7%;微观结构表明,单一0.5%CTMAB发泡剂所制得泡沫的泡径分布不均匀,较大泡径超过1 mm,液膜较薄,平均厚度为63.3μm,微生物-0.5%CTMAB复合型发泡剂所制得泡沫的泡径分布均匀,平均泡径集中于700~900μm,液膜较厚,平均厚度为91.3μm。
A kind of bio-based foaming agent for foam concrete was prepared using yeast,it was based on the self-made microbial foaming agent,supplemented by different surfactants(Hexadecyl trimethyl ammonium bromide(CTMAB)and Sodium laurylsulfonate(CAS)),the foam properties and microstructure of foaming agent before and after compounding were studied respectively.The results show that:Compared with the single 0.7%CAS foaming agent,the microbial-0.7%CAS compound foaming agent’s foaming multiple is increased by 7.5%,the 1 h settlement and the 1 h bleeding rate are decreased by 9.4% and 1.5%,respectively,compared with the single 0.5% CTMAB foaming agent,the microbial-0.5% CTMAB compound foaming agent’s foaming multiple is increased by 33.4%,the 1 h settlement and the 1 h bleeding rate are decreased by 88.9%and 9.7%.The microstructure shows that,the bubble diameter distribution of foam prepared by single 0.5%CTMAB foaming agent is uneven,larger bubble diameter more than 1 mm,the liquid film is thinner,the average thickness is 63.3μm,the bubble diameter distribution of the foam prepared by microbial-0.5%CTMAB compound foaming agent is uniform,the average bubble diameter is 700-900μm,the liquid film is thicker,the average thickness is 91.3μm.
作者
荣辉
张静
张磊
张颖
徐蕊
刘志华
RONG Hui;ZHANG Jing;ZHANG Lei;ZHANG Ying;XU Rui;LIU Zhihua(School of Materials Science and Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Key Laboratory of Building Green Functional Materials,Tianjin 300384,China;Tianjin Construction Waste and Coal-fired Waste Utilization Technology Engineering Center,Tianjin 300384,China;Tianjin Key Laboratory of Civil Structure Protection and Reinforcement,Tianjin 300384,China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第1期90-95,共6页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(51978439,51708390)
中国博士后科学基金(2019M651000)
天津市交通运输科技发展计划(2018-38)
