复合防水剂对脱硫石膏砌块力学性能和防水性能的影响  

The influence of compound waterproof agent on mechanical and waterproofing performance of desulfurized gypsum blocks

作　　者：袁洁 陈畅[2] 王楠 马奋天 王宇斌[3] Yuan Jie;Chen Chang;Wang Nan;Ma Fentian;Wang Yubin(Jiuquan Iron and Steel(Group)Co.,Ltd.,Jiayuguan Gansu 735100,China;School of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an Shaanxi 710055,China;School of Resources Engineering,Xi'an University of Architecture and Technology,Xi'an Shaanxi 710055,China)

机构地区：[1]酒泉钢铁(集团)有限责任公司,甘肃嘉峪关735100 [2]西安建筑科技大学材料科学与工程学院,陕西西安710055 [3]西安建筑科技大学资源工程学院,陕西西安710055

出　　处：《化工矿物与加工》2022年第3期36-40,共5页Industrial Minerals & Processing

基　　金：陕西省教育厅科学研究计划项目服务地方专项(20JC023);陕西省建设厅科技发展计划(2019-K36);西部绿色建筑国家重点实验室培育基地开放研究基金(LSKF201907)。

摘　　要：利用固体废弃物脱硫石膏制备的砌块耐水性差、浸水后强度明显降低,并且会产生严重的泛霜现象,影响其外观和力学性能,限制了其推广应用。基于此,使用甲基硅酸钠、二甲基硅油和聚甲基氢硅氧烷分别双掺作为复合防水剂,研究其对脱硫石膏砌块的力学性能和防水性能的影响,结果表明:脱硫石膏砌块随着聚甲基氢硅氧烷和甲基硅酸钠复合防水剂掺量的增加,抗压强度和抗折强度先减小后增大,软化系数变大;当聚甲基氢硅氧烷和甲基硅酸钠的掺量分别为0.30%、0.25%时,砌块的接触角为108°,防水性能良好。The blocks prepared with desulfurized gypsum as a solid waste has poor water resistance.After being soaked in water,their intensity will decrease greatly,even cause serious frost on them,which may negatively affect their appearance and mechanical properties and restrict their applications.Because of the above mentioned,sodium methylsilicate,dimethylsiloxane and polymethylhydrosiloxane were double-doped and employed as different compound waterproofing agents respectively to study the effect of them on both the mechanical properties and waterproof performance of desulfurized gypsum blocks.The results show that with the increase of the content of polymethylhydrosiloxane and sodium methylsilicate in the desulfurized gypsum blocks,their compressive and bending strength firstly drops and then goes up and the softening coefficient increases.As the content of polymethylhydrosiloxane and sodium methylsilicate is 0.3%and 0.25%respectively,the contact angle of the block is 108°and presents excellent waterproofing performance.

关 键 词：脱硫石膏砌块 复合防水剂 物理性能 力学性能 防水性能 

分 类 号：TU522.3[建筑科学—建筑技术科学]