摘要
研究了纳米偏高岭土、重钙粉、可再分散乳胶粉、膨胀剂氧化钙对石灰基注浆材料力学性能、粘结性、干缩性能的影响.结果表明:加入纳米偏高岭土、重钙粉能提高注浆材料的强度,掺入可再分散乳胶粉能提高注浆材料与本体之间的粘结力和柔韧性,掺入膨胀剂氧化钙能有效解决注浆材料收缩大的问题.在水胶比0.5,m(天然水硬性石灰)∶m(纳米偏高岭土)∶m(重钙粉)=64∶6∶30,氧化钙、可再分散性乳胶粉、甲基纤维素醚、减水剂、消泡剂掺量分别为干粉质量的8.0％、0.6％、0.8％、0.3％、0.2％时,制备的注浆材料具有与本体材料匹配的力学性能,兼容性好,可用于历史建筑砖石结构修复.
Abstract
In this paper,the effects of nano metakaolin,heavy calcium powder,redispersible latex powder and calcium oxide expansive agent on the mechanical properties,adhesion and drying shrinkage of lime-based grouting materials were studied.The test results show that the addition of nano metakaolin and heavy calcium powder can improve the strength of grouting materials,redispersible latex can improve the cohesive force and flexibity between grouting material and bulk material,and calcium oxide expansive agent can effectively solve the problem of large shrinkage of grouting materials.When the water-cement ratio is 0.5,the m(natural hydraulic lime)∶m(nano metakaolin)∶m(heavy calcium powder)=64∶6∶30,the content of calcium oxide,redispersible latex,methyl cellulose,water reducer,and defoamer is 8.0％,0.6％,0.8％,0.3％and 0.2％of the dry powder mass,respectively,the prepared grouting material has mechanical properties matching with the bulk material,good compatibility,and can be used for the restoration of historical building masonry structures.
基金项目
住房和城乡建设部研究开发项目(2022-K-059)
中国建筑科学研究院有限公司青年科研基金项目(20210122331030007)
维普
万方数据