固废基胶凝材料混凝土专用外加剂的开发与应用研究  

Development and application of special admixture for concrete of cementitious materials based on solid waste

作　　者：曹攀攀 黄修林[1,3] 包申旭[4] 蒋忠 CAO Panpan;HUANG Xiulin;BAO Shenxu;JIANG Zhong(Macheng Hubei University Research Academy of Industral Technology,Huanggang 438300,China;Hubei Jueshuo New Material Technology Co.Ltd.,Huanggang 438300,China;School of Materials Science and Engineering,Hubei University,Wuhan 430070,China;School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430068,China)

机构地区：[1]麻城湖北大学产业技术研究院,湖北黄冈438300 [2]湖北珏硕新材料科技有限公司,湖北黄冈438300 [3]湖北大学材料科学与工程学院,湖北武汉430062 [4]武汉理工大学资源与环境学院,湖北武汉430070

出　　处：《湖北大学学报（自然科学版）》2023年第4期628-633,共6页Journal of Hubei University：Natural Science

基　　金：湖北省重点研发计划(2022BAA029)资助。

摘　　要：固废基胶凝材料往往细度大、吸附强,用于混凝土中,降低新拌混凝土工作性能,增大硬化混凝土收缩,使得混凝土易开裂,影响混凝土结构的服役寿命.通过引入低表面张力的小分子醇制备的减缩功能单体,合成了具有减缩功能的聚羧酸减水剂.研究了反应参数对功能单体和聚羧酸减水剂性能的影响,结果表明,在酸醇比3.5∶1,反应温度135℃,催化剂用量为4.5%时,功能单体酯化反应的酯化率可达86%以上.在酸醚比为6.5,n(MD)/n(TPEG)为1.5时制备的聚羧酸减水剂,相比普通减水剂,分散性能提高8%,混凝土干燥收缩降低22%.Solid waste-based cementitious materials reduce the performance of fresh concrete,increase the shrinkage of hardened concrete,making concrete easy to crack,affecting the service life of concrete structures,because of its large fineness,strong adsorption characteristics.Polycarboxylate superplasticizer with shrinkage reducing function was synthesized by introducing shrinkage reducing functional monomer prepared by small molecular alcohol with low surface tension.The effects of reaction parameters on the properties of functional monomer and polycarboxylate superplasticizer were studied.The results show that when the ratio of acid to alcohol is 3.5∶1,the reaction temperature is 135℃ and the amount of catalyst is 4.5%,the esterification rate of functional monomer can reach over 86%.When the acid ether ratio is 6.5 and n(MD)/n(TPEG)is 1.5,the polycarboxylate superplasticizer is prepared.Compared with the ordinary superplasticizer,the dispersion performance is increased by 8%,and the drying shrinkage of concrete is reduced by 22%.

关 键 词：聚羧酸减水剂 固废 胶凝材料 减缩 

分 类 号：TU528.042[建筑科学—建筑技术科学]