Anti-cracking additive

Abstract

The invention provides an anti-cracking additive which is characterized by comprising the following components according to proportions as follows: 40-70wt% of ground slag, 10-20wt% of silicon powder, 5-15wt% of iron powder, 3-8wt% of aluminum powder, 5-15wt% of quartz powder, 1-3wt% of anti-cracking anti-permeability anti-abrasion fiber, 1-3wt% of glass fiber and 3-8wt% of expanding agents. In asurface coating of an outer wall of a building, after cement mortar, putty and the like are matched into the anti-cracking additive, a coating layer can not generate any cracks in the initial period,the bonding strength is more than 0.5MPa, the coating layer can not strip, does not generate bubbles and cracks, and is not obvious in color change in temperature resistance deformation experiments, the water permeability of the coating layer is 0.5mL, and simultaneously, the coating layer dose not generate cracks, can not strip and is not obvious in deformation through an impact resistance experiment. In addition, as waste slag is taken as a main raw material of the additive, the cost is low, and also the industrial waste-slag can be recycled effectively and utilized comprehensively, so thatthe waste material can be recycled, and the serious problems of large land occupying, serious environment pollution and the like caused by the stacking of the slag can be solved fundamentally.

Description

technical field [0001] The invention relates to an additive, in particular to an anti-cracking additive used for concrete, putty, mortar and other building exterior walls. Background technique [0002] In order to increase the decorative effect of the building and protect the wall material, a cement mortar layer or a putty layer is usually made on the outer wall of the building. Because cement mortar, putty and other surface building materials will crack due to hydration shrinkage and different expansion coefficients of different materials, etc., which will lead to cracks in the surface coating, and once there are cracks, it will not only affect the buildings. The appearance, more seriously, will cause rainwater leakage due to cracks, which will affect the interior decoration of the building. Therefore, the cracking of the surface coating has always been a problem that is difficult to break through in the construction industry. In order to overcome the cracking of the build...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem of cracking of surface coatings for building exterior walls—cement mortar layer or putty layer, the invention provides an anti-cracking additive