Study on Curing Effect of Paint Type Shrinkage Reducing Agent
By H. Nishi, T. Sagawa and T. Matsuzawa
Concrete Journal, Vol.51, No.3, Mar. 2013
- Synopsis
- The penetration mechanism of paint type shrinkage reducing agent was modeled and the influence of its curing effect on the hydration of cement and the hydrous properties of hardened cement was investigated. With regard to the penetration mechanism, the effect of the fluid properties on permeability, coating thickness, and drip characteristics were studied, and the feasibility of evaluating the penetration depth with the Lucas-Washburn method was confirmed. The fundamental findings that the curing effect of paint type shrinkage reducing agent inhibits the reduction in moisture content and prevents hydration delay even in dry conditions were obtained. The fact that these effects inhibit the progress of drying shrinkage and carbonation, even under dry conditions, demonstrates that paint type shrinkage reducing agent promotes sound strength development. Finally, the results of an investigation on cracks in the case of application to building structures are reported.
- Keywords:
- Paint type shrinkage reducing agent, blastfurnace slag blended cement, hydration, moisture content, drying shrinkage, carbonation, compressive strength
