Experimental Study On The Bond Performance Between Advanced Composite Glass Fiber Sheets And Concrete

Currently,the application of Fiber Reinforced Polymer or Fiber Reinforced Plastic(FRP for short) in strengthening RC(reinforced concrete) structures is in the ascendant, theory study enters a fast development period, but the domestic study mainly concentrated on the carbon fiber material. However, the glass fiber has advanced tensile strength and low price, the study on it is few. So the application of the glass fiber which is high homemade in strengthening RC structures is restricted.Strengthening RC structures by FRP is succeed or not mainly lies on the effect of the bond behavior between the concrete and FRP. The nicer bond quality is the premise of guaranteeing the strengthening effect. Meanwhile, it is the foundation of designing the dosage of the fibre sheet in the strengthening project. In our country, the study on concrete structure strengthened by advanced composite glass fiber sheet is new, the systematicness and practicability is inadequate, especially, there's no mature research in the field of bond performance. Therefore, to realize the bond performance and its change rule between the advanced composite glass fiber sheet and concrete is very important.This article adopted two glass fibre sheets: America TYFO advanced composite glass fiber sheet, and EGFW430 advanced composite glass fiber sheet having the same mechanics capability which made by Nanjing glass fibre academe. Through the bonding tests and the theory analysis between the advanced composite glass sheets and the concrete under the general load-carrying condition, the iterative load-carrying condition, the freeze-thaw action, and the defective bonding, the calculative model has been established, and the numerical value of fibre sheet strain under different load-carrying has been confirmed. The bond strength calculative expressions for the concrete bonded with glass fibre sheet under the pull-shear and the bend load-carrying conditions have been established. The author put forward the decreasing coefficient and the calculative expressions for the influence of reinforce effect by the non-effective area and the calculative expressions for the influence of the freeze-thaw action on the carrying capacity of the concrete beams. It has proved that the glass fibre sheets and the concrete has a good bonding condition subjected repeated fatigue load.Compared both the bond performance and the price of the three sheets:...