磷石膏基复合材料的制备及性能研究  

Study on the Preparation and Performance of Phosphogypsum-based Composites

作　　者：柏洁[1] 周华 谢嘉骥 文伟 丁俊豪 冯选辉 BAI Jie;ZHOU Hua;XIE Jia-ji;WEN Wei;DING Jun-hao;FENG Xuan-hui(College of Civil Engineering,Guizhou University,Guiyang 550025,China;Guizhou Electric Power Construction Supervision Consulting Co.,Ltd.,Guiyang,550002,China;Tianjin Navigation Bureau,Tianjin 300450,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550025 [2]贵州电力建设监理咨询有限责任公司,贵州贵阳550002 [3]天津航道局,天津300450

出　　处：《混凝土与水泥制品》2021年第12期94-99,共6页China Concrete and Cement Products

基　　金：贵州省科技计划项目(黔科合基础2018[1405])。

摘　　要：以磷石膏、粉煤灰、矿渣微粉、生石灰为主要原料制备了磷石膏基复合材料,研究了磷石膏基复合材料性能的影响因素,并通过多变量数值分析得到了最优配合比。结果表明:当磷石膏、粉煤灰、矿渣微粉、生石灰的质量比为1∶0.4∶0.06∶0.03时,制备的磷石膏基复合材料的抗压、抗折强度均较高;掺入6‰防水剂对磷石膏基复合材料的抗压强度提升较大,复掺3‰减水剂+3‰防水剂对抗折强度提升较大;当水胶比为0.38~0.40时,磷石膏基复合材料的强度较高;21℃蒸汽养护14 d可使磷石膏基复合材料的强度达到最佳,但蒸汽养护会导致磷石膏基复合材料的吸水率增大、软化系数降低;通过数值分析建立的多变量磷石膏基复合材料的强度计算公式,可以得出单一变量下磷石膏基复合材料的强度值和多变量下磷石膏基复合材料的强度值与对应原材料掺量之间的关系。The phosphogypsum-based composites were prepared with phosphogypsum,fly ash,slag powder and quicklime as main raw materials.The factors affecting the performance of phosphogypsum-based composites were studied,and the optimal mix proportion was obtained through multivariate numerical analysis.The results show that when the mass ratio of phosphogypsum,fly ash,slag powder,and quicklime is 1∶0.4∶0.06∶0.03,the compressive and flexural strengths of the prepared phosphogypsum-based composite materials are higher.The compressive strength of phosphogypsum-based composites is greatly improved by adding 6‰water-repellent agent,and the flexural strength of phosphogypsum-based composites is greatly improved by adding 3‰water-reducing agent+3‰water-repellent agent.When the water-binder ratio is 0.38~0.40,the strength of phosphogypsum-based composites is higher.Steam curing at 21℃for 14 days can optimize the strength of phosphogypsum-based composites,but steam curing will increase the water absorption and decrease the softening coefficient of phosphogypsum-based composites.Through the strength calculation formula of multivariable phosphogypsum-based composites established by numerical analysis,the relationship between the strength value of phosphogypsum-based composites under single variable and the strength value of phosphogypsum-based composites under multivariable and the corresponding raw material content can be obtained.

关 键 词：磷石膏 复合材料 抗压强度 抗折强度 数值分析 吸水率 软化系数 

分 类 号：TU528[建筑科学—建筑技术科学]