| 摘要: |
| 研究了引气剂对硅酸盐水泥基饰面砂浆初次泛白和二次泛白的影响及其作用机理.结果表明：引气剂通过引气和促凝作用能显著抑制硅酸盐水泥基饰面砂浆的初次泛白，还能显著减轻硅酸盐水泥基饰面砂浆7d前的二次泛白，消除7d后的二次泛白.原因在于引气剂虽会导致硅酸盐水泥基饰面砂浆总孔隙率增多，但能显著减少小毛细孔的比例，同时可显著降低孔溶液中K+，Na+的质量浓度，并抑制它们的迁移，使表面溶出的碱性离子总含量显著降低，从而降低表面浸取液中的固体含量，起到抑制二次泛白的作用. |
| 关键词: 硅酸盐水泥基饰面砂浆 引气剂 泛白 影响机理 |
| DOI：10.3969/j.issn.1007 9629.2017.01.001 |
| 分类号: |
| 基金项目:国家重点研发计划项目（2016YFC0700905）；陕西省教育厅专项科研计划项目（16JK1433）；西安建筑科技大学科技项目（QN1621）；西建大材料学院青年博士科研基金 |
|
| Effect of Air Entraining Agent on Efflorescence of Cement Based Decorative Mortar and Its Mechanism |
|
ZHU Huimei1, WANG Peiming2, ZHANG Guofang2
|
|
1.College of Materials & Mineral Resources, Xian University of Architecture and Technology, Xian 710055, China;2.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China
|
| Abstract: |
| Effects of air entraining agent on the primary efflorescence and secondary efflorescence of Portland cement based decorative mortar（PCDM）and its mechanism were studied. The results show that air entraining agent significantly prohibits the primary efflorescence of PCDM by its outstanding air entraining effect and procoagulant effect. Air entraining agent also significantly reduces the secondary efflorescence of PCDM with ages shorter than 7d， and eliminates the secondary efflorescence of PCDM with ages longer than 7d， so that it decreases the proportion of small capillaries， and the concentrations of K+， Na+ in the pore solution， and also prohibits these ions mobility， accordingly greatly decreases the total leachability of alkali ions on the surface of PCDM. So the solid content in the surface leaching solution and secondary efflorescence degree of PCDM are reduced. |
| Key words: Portland cement based decorative mortar（PCDM） air entraining agent efflorescence effect mechanism |
