预拌砂浆保水性相关问题探讨

Discussion on Water Retention of Ready-mixed Mortar

分析了现有砂浆标准中的两种砂浆保水性测试方法,对比了不同砂浆保水增稠材料的测试结果及高保水性特种砂浆的测试结果。结果表明,同样材料下试模滤纸法测试结果偏高,容易达到标准要求,而用真空抽滤法均达不到低保水标准要求。砌筑与抹灰砂浆用真空抽滤法和试模滤纸法测试的砂浆保水率存在明显的差异。而真空抽滤法能有效区分特种砂浆保水性能上的差异。建议预拌砂浆根据不同保水率分级,以便用户可根据基墙吸水的不同选用不同保水性能的砂浆。

Two kinds of test method for water retention of mortar are analyzed in existing standards, test results of different water retention and thickending materials of mortar and high water retention of special mortar are compared. The results show that the test results increase with tryout filter paper method under the same materals and tryout filter paper method can meet standard requirments easily, however, vaccum take-off method can meet standard requirments hardly. There are significant differences of mortar retentivity for masonry mortar and mortar for plaster and between vaccum take- off method and tryout filter paper method. Vaccum take-off method can effectively distinguish the differences of water retention properties for special mortar. According to different water retention rate, the grade of ready-mixed mortar is proposed. Based on different absorption of wall, the users can choose different water retention of mortar.