| 摘要: |
| 研究了聚羧酸减水剂及其掺量变化对水泥基饰面砂浆泛碱性能的影响规律.结果表明：聚羧酸减水剂能显著降低饰面砂浆初次泛碱面积和二次泛碱面积，其掺量大于0.6%后，饰面砂浆基本无泛碱现象；掺加聚羧酸减水剂后，饰面砂浆总孔隙率降低，表面孔隙数量和内部孔隙率减小，毛细孔吸水量下降，连通孔隙减少，抑制了饰面砂浆的表面泛碱现象. |
| 关键词: 饰面砂浆 聚羧酸减水剂 泛碱性能 孔结构 毛细孔吸水量 |
| DOI：10.3969/j.issn.1007-9629.2023.01.001 |
| 分类号:TU56+4.5 |
| 基金项目:“十三五”国家重点研发计划项目（2018YFD1101003， 2016YFC0700905）； 上海市住房与城乡建设委员会科研项目（2020-001-009）； 固废资源化利用与节能建材国家重点实验室开放基金项目； 同济大学大型仪器设备开放测试基金资助项目（2021GX024） |
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| Effects of Polycarboxylate Superplasticizer on Efflorescence of Cement-Based Decorative Mortar |
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ZHANG Guofang1,2,3, WANG Cong1,2, WANG Zhaojia4, WANG Bo1,2, HUANG Tianyong4
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1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education， Tongji University， Shanghai 201804， China;2.School of Materials Science and Engineering， Tongji University， Shanghai 201804， China;3.Research Center of Intelligent Evaluation and Restoration Engineering Technology of Urban Pipe Network of Shanghai Water Bureau， Shanghai 201900;4.Beijing Building Materials Academy of Sciences Research， Beijing 100041， China
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| Abstract: |
| The effect of polycarboxylate superplasticizer and its content on efflorescence of cement-based decorative mortar was studied. The results show that polycarboxylate superplasticizer can significantly reduce the primary and secondary efflorescence areas of decorative mortar. When the polycarboxylate superplasticizer content is higher than 0.6%， basically no efflorescence occurs in the decorative mortar. After adding superplasticizer， the total porosity， number of surface pores， internal porosity， water absorption of gross pores and connected pores of the decorative mortar decrease， and the surface efflorescence of the decorative mortar is restrained. |
| Key words: decorative mortar polycarboxylate superplasticizer efflorescence pore structure capillary water absorption |
