Effect Of Specimen Thickness On Hygrothermal Ageing Of BFRP Laminates

Fiber reinforced composites (FRP) has a very excellent mechanical properties and good corrosion resistance,it has been studied by many countries in the world and attention. FRP durability is also considered one of the effective ways to solve the problem of steel corrosion. However, the scope and depth of research is not enough. Poor resistance to high temperature properties of the resin matrix and FRP degradation mechanism limit the application of FRP in civil engineering field.In the paper, We use temperature to accelerate test methods, we study the BFRP water absorption and diffusion behavior, tensile properties, and lateral bending and transverse shear effects of the interface, the main contents are as follows:(1)We study water absorption experiments after BFRP soak in distilled water and alkali solution at different thickness and different temperatures.(2)We study the tensile properties experiments at different temperatures and in different thickness after BFRP soak in distilled water and alkali solution.(3)We study lateral bending and transverse shear experiments at different temperatures and in same thickness after BFRP soak in distilled water and alkali solution.(4)We combine the acceleration of the thickness and temperature to study BFRP durability, We have different temperatures and different thickness data curve fitted, we predict BFRP strength degradation. Through the processing and analysis of test results, the following conclusions can be obtained:In the water absorption test, the initial immersion in water absorption rate is faster, the latter absorption rate becomes smaller.Under high temperature, the internal failure occurs, water absorption uptaking reduces.At the same thickness, the rate of water absorption increases with the temperature.At the same temperature, the rate of absorption decreases with increasing number of layers, the specimen absorption peak decreases with increasing number of layers. In tensile mechanical properties of the test specimen, the tensile strength decreases with increasing temperature.At the same temperature, the tensile strength increases with increasing number of layers. Through experimental results, We use acceleration test methods of temperature and thickness,we can get BFRP strength degradation prediction formula.We provide reliable research data FRP applications in civil engineering field.