Research on the preparation of grouting materials for the restoration of masonry structures in historical buildings
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.
万方数据
维普
