改性磷石膏抹灰砂浆性能研究  

Investigation on Properties of Modified Phosphogypsum Plaster Mortar

作　　者：高育欣 麻鹏飞 康升荣 程宝军 杨文 顾晓薇[4] GAO Yuxin;MA Pengfei;KANG Shengrong;CHENG Baojun;YANG Wen;GU Xiaowei(China West Construction Academy of Building Materials Science Co.,Ltd.,Chengdu 610221,China;China West Construction Group Co.,Ltd.,Chengdu 610213,China;School of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Technology Innovation Center for Intelligent Water Resources and Environment,Northeastern University,Shenyang 110819,China)

机构地区：[1]中建西部建设建材科学研究院有限公司,四川成都610221 [2]中建西部建设股份有限公司,四川成都610213 [3]重庆大学材料科学与工程学院,重庆400044 [4]东北大学智慧水利与资源环境科技创新中心,辽宁沈阳110819

出　　处：《金属矿山》2022年第1期14-20,共7页Metal Mine

基　　金：“十三五”国家重点研发计划项目(编号:2019YFC1907200);贵州省交通厅项目(编号:2020-143-024);成都市科技创新联合培养重点产业领域博士资助项目(编号:2021-RC04-00015-CG)。

摘　　要：为了解决磷石膏抹灰砂浆耐水性差的问题,促进磷石膏抹灰砂浆在建筑行业的应用,采用预处理的改性磷石膏,研究了水胶比和减水剂掺量对改性磷石基抹灰砂浆物理性能、力学性能和耐水性能的影响,并通过在体系中引入有机硅防水剂来进一步改善磷石膏抹灰砂浆耐水性能。研究结果表明:减水剂掺量和水胶比是影响磷石膏抹灰砂浆性能的主要因素,低水胶比和低减水剂掺量有利于其力学性能和耐水性能的提升,且减水剂掺量不宜高于0.9%;有机硅防水剂虽然能有效改善磷石膏抹灰砂浆耐水性能,但会对其强度造成不利影响,实际应用时其掺量不宜高于0.6%;水化产物中的凝胶和钙矾石可以填充二水硫酸钙晶体间空隙,有利于试件密实度、强度和软化系数的提高,且有机硅防水剂会在水化产物表面和间隙中形成防水膜,可以进一步改善试件耐水性能。In order to solve the problem of poor water resistance of phosphogypsum plaster mortar and promote the application of phosphogypsum plaster mortar in construction industry,modified phosphogypsum was obtained by pretreating,and the effects of water-binder ratio and water reducing agent dosage on the physical properties,mechanical properties and water resistance of modified phosphogypsum plastering mortar were studied.The water resistance of phosphogypsum plastering mortar was further improved by introducing silicone water repellents into the system.The results show that the mixing amount of water reducing agent and water-binder ratio are the main factors affecting the properties of phosphogysum plastering mortar.Low waterbinder ratio and low water reducing agent dosoge are beneficial to the improvement of mechanical properties and water resistance,and the mixing amount of water reducing agent should not be higher than 0.9%.Although silicone water repellents can effectively improve the water resistance of phosphogypsum plaster mortar,it will adversely affect its strength,and its dosage should not be higher than 0.6%in practical application.The gel and ettringite in the hydration product can fill the gap between the crystals of calcium sulfate dihydrate,which is beneficial to the increase of the density,strength and softening coefficient of the specimen.And the silicone water repellents will form a waterproof film on the surface and the gap of the hydration product,which can further improve the water resistance of the specimen.

关 键 词：改性磷石膏 抹灰砂浆 有机硅防水剂 耐水性能 

分 类 号：TQ177.3[化学工程—硅酸盐工业]