Study on Inorganic Cohesive Glue
In concrete construction, it is usual to encounter integrating problems between old and new concrete interfaces, such as disease concrete’s repairing and anchoring, concrete blocking construction and etc. Due to low cohesion strength between old and new concrete interfaces, weak interface is formed, then old and new concrete cannot construct as an integrate whole which tends to be damaged along the interfaces after being loaded and results in hidden danger. Regarding of this situation, the paper optimizes the mix on the base of mixes tests on inorganic cohesion material used between old and new concrete interfaces. When the material is used to old and new mortar interfaces and old and new concrete interfaces, cohesion tensile strength in interfaces equates or is higher than that of mortar itself and concrete itself; In the mean time, through permeability test the impermeability in the interface equates that of concrete itself, eliminating weak interfaces between old and new concrete. Physical property tests show that the material’s mechanical property is better than that of concrete, deformation property is close to concrete’s, especially linear expansion (temperature deformation) coefficient is basically consistent with that of concrete, avoiding peel-off damage after repeated internal forces due to too much difference between linear expansion coefficients when organic cohesion material is used. By analysis of hydraulic productions in interfaces and micro structure, the mechanism of inorganic cohesion glue is illuminated. It results in satisfying cohesive effect when optimized inorganic cohesion material is applied to high-strength concrete repair and RCC interfaces.
Yun-Hae Kim, Prasad Yarlagadda, Xiaodong Zhang and Zhijiu Ai
Z. Li et al., "Study on Inorganic Cohesive Glue", Advanced Materials Research, Vols. 335-336, pp. 1215-1218, 2011