Analysis on flexural capacity of basalt textile grid‐reinforced ECC strengthening RC beam

Abstract

The basalt textile grid‐reinforced engineered cementitious composite (ECC) is used to strengthening the reinforced concrete beam. Flexural test and theoretical analysis were carried out. The flexural tests were performed, including six basalt textile grid‐reinforced ECC strengthening beams and one control beam. The variables include two grid strength and three treatments for the interface of the strengthening layer. The failure modes of test beams were evaluated. The load‐deflection curve is analyzed, and stress–strain curve of steel bar and grid are analyzed. The strengthening effects of chipping treatment, epoxy resin bonding treatment and rebar‐planting treatment are discussed. The comprehensive evaluation of the results shows that the strengthening effect of the epoxy resin bonding treatment is the best method. The carrying capacity of the strengthened beam in cracking stage, yield stage, and ultimate stage increased 62.8%–78.5%, 10.3%–18.9%, and 1.8%–10.9%, respectively. The analytical solutions for the calculation method of carrying capacity of strengthened beams in cracking, yield, and ultimate stages is proposed. The calculation value of strengthened beam agree well with the test results. The formula for predicting the flexural capacity of a beam strengthened with the basalt textile grid‐reinforced ECC is established.