Cement Science and Concrete Technology
Online ISSN : 2187-3313
Print ISSN : 0916-3182
ISSN-L : 0916-3182
Repair and Strengthening
LOAD-CARRYING CAPACITY OF ADHESIVE-APPLIED NSM INCREASING THICKNESS METHOD USING METAL-GRID EXPANDED TYPE ON DAMAGED RC COLUMNS
Yasukuni YOSHIOKATadashi ABEKazuhiko MINAKUCHINoritaka MOROHASHI
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2021 Volume 75 Issue 1 Pages 340-347

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Abstract

This study is an experimental study on the reinforcement technology for RC columns damaged by deterioration over time and environmental factors. In the experiment, 2 kinds of specimens are prepared. Axial loading tests are conducted to damage the specimens. The authors proposed a method of repair and reinforcement damaged concrete column members by combining an adhesive-applied increasing thickness method using metal-grid expanded type and a crack repair method. The proposed repair and reinforcement method were used resin injection to repair cracks, installed with metal-grid expanded type, sprayed with epoxy adhesive then increased thickness with non-shrink mortar at 40mm. The results showed that the proposed reinforcing method improved a load-carrying capacity of RC columns and increased the strengthening effect by more than 2.0 times. It is considered that the axial compressive load capacity was properly shared between vertical bar and tie bar of metal-grid expanded type. Accordingly, the proposed repair and reinforcing method are considered to be practical as the reinforcement technology for damaged concrete bridge piers (RC columns).

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