Mechanical Properties of Very Rapid Hardening Polymer Mortar for Concrete Repair

Abstract

In this study, mechanical properties of Very-Rapid Hardening Polymer (VRHP) mortar were investigated. To do it, 75 VRHP mortar specimens were tested by the compressive test, bending test, bonding test, freezing and thawing test, length variation test, and water absorption test. From the test results, it was confirmed that the bond strength of VRHP was higher than that of normal concrete by 50 %, and the resistance of freezing and thawing of VRHP was more excellent than normal concrete. In addition, length variation ratio and water absorption ratio of VRHP were smaller than those of normal concrete by 20 %. Therefore, It should be mentioned that VRHP can be successfully used as the material for repairing the crack of concrete structure.

A Study on Tensile Behavior According to the Design Method for the CFRP/GFRP Grid for Reinforced Concrete

“…VRHP mortar was overlayed on the composites after attaching the FRP grid to the fabricated concrete specimen. VRHP mortar is one of the concrete repair and reinforcement materials characterized by rapid initial strength development, high fluidity, and high concrete adhesion [ 26 ]. VRHP mortar filled the protruding part of the FRP grid due to its high fluidity and fixed the FRP grid to the concrete specimen.…”