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建筑石膏与胶凝材料
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聚羧酸减水剂对β-半水磷石膏性能的影响

作者：杨珖1，薄盛宏1，邓磊2，罗小峰2，刘其斌1

关键字：聚,羧酸,减,水剂,对,半水,磷,石膏,性能,的,

　
[1.贵州大学 材料与冶金学院，贵州 贵阳  550025；
2.科之杰新材料集团（贵州）有限公司，贵州 龙里  551206]
    摘要：研究了4种减水剂对β-半水磷石膏流动度的影响，并进一步分析了不同掺量聚羧酸减水剂PS-L对β-半水磷石膏流动度、凝结时间、标准稠度用水量及力学性能的影响，通过扫描电镜（SEM）、全自动压汞仪（MIP）分析了磷石膏的晶体形貌、孔隙率及孔径分布。结果表明，PS-L可有效增大β-半水磷石膏的流动度，延长凝结时间。当PS-L掺量为0.5%时，标准稠度用水量降低至49%，抗压、抗折强度分别为14.8、3.85 MPa，比空白样分别提高了62.6%、57.1%。PS-L使得粗大的板状晶型减少，晶体间搭接更紧密。当PS-L掺量为0.3%，孔隙率和中值孔径分别为51.6%和1065.3 nm，与空白样相比分别降低了12.17%、27.50%。β-半水磷石膏颗粒越细，在0.1%~0.5%范围内，聚羧酸减水剂PS-L掺量越高，硬化体的力学性能越好。
    关键词：β-半水磷石膏；聚羧酸减水剂；强度；孔隙率
    中图分类号：TU526        文献标识码：A        文章编号：1001-702X（2023）01-0124-04
 
Effect of polycarboxylate superplasticizer on the properties of β-hemihydrate phosphogypsum
YANG Guang1，BO Shenghong1，DENG Lei2，LUO Xiaofeng2，LIU Qibin1
（1.School of Materials and Metallurgy，Guizhou University，Guiyang 550025，China；
2.KZJ New Materials Group Guizhou Co. Ltd.，Longli 551206，China）
    Abstract：The effects of four kinds of water reducing agents on the fluidity of β-hemihydrate phosphogypsum were investigated，and the effects of different doses of polycarboxylate superplasticizer PS-L on the fluidity，setting time，water consumption of standard consistency and mechanical properties of β-hemihydrate phosphogypsum were further analyzed. Scanning electron microscopy（SEM） and automatic mercury porosimetry（MIP） were used to analyze the crystal morphology，porosity and pore size distribution of phosphogypsum. The results showed that PS-L can effectively improve fluidity of β-hemihydrate phosphogypsum，and extend setting time of phosphogypsum. When PS-L was dosed at 0.5%，the water consumption of standard consistency was reduced to 49%，and the compressive strength and flexural strength were 14.8 MPa and 3.85 MPa，which were increased by 62.6% and 57.1% compared with the blank control，respectively. Polycarboxylate superplasticizer PS-L makes the plate crystalline shape reduced and the lap between crystals tighter. When PS-L was dosed at 0.3%，the porosity and median pore size were 51.6% and 1065.3 nm，respectively，which were reduced by 12.17% and 27.50% compared with the blank control. The finer β-hemihydrate phosphogypsum particles，the higher the content of polycarboxylate superplasticizer PS-L，the better the hardened phosphogypsum physical properties.
    Key words：β-hemihydrate phosphogypsum，polycarboxylate superplasticizer，strength，porosity