Physicochemical properties of modified epoxy used for reinforcing concrete by carbon fiber reinforced polymer

Abstract

This work is an experimental investigation about the properties of sand-powder adhesive subjected to high temperature. Thus, three main mixtures were tested. These mixes contain three different sand to adhesive ratios; 0:1, 1:1 and 1.5:1. The Simultaneous of Thermal Analyzers (STA); represent real-time measurement, change of sample weight analysis and heat flow were investigated. The results indicated that the physicochemical properties (residual mechanical properties, residual weight, weight losing rate, glass transition temperature (Tg), Carbonate point or extrapolated onset temperature (To), and heat flow) have been remarkably enhanced by the addition of sand-powder. The addition of sand resulted in increased epoxy resistance to high heat. When the sand-powder exposed to 550 ° C, the weight loss of the epoxy was 52%, 30% and 25% for sand to adhesive ratios equal to 0, 1, and 1.5 % respectively. In other words, the epoxy containing a high proportion of sand retained 25% of its weight under the influence of a high temperature degree. Adding sand increases the temperature and time necessary to reach the first and second carbonation point. Adding sand to adhesive increase the temperature needed to reach the glazing point Tg and the point of reversal in the curve derived from loss of weight.