A Study on the Effect of polymeric Additives on the Viscosity and Workability of Concrete Mixtures

Abstract

This study investigates how polymeric additives affect rheological and mechanical features of concrete mixtures. The focus was placed on the role of these additives in controlling the viscosity of the cement paste and enhancing workability on one hand, and enhancing the long-term strength of concrete on the other. Two types of polymers were examined: Polycrete (PC) and Epoxy Resin, within a range of concentrations and temperatures (20–80 °C), to evaluate and compare their performance. The results showed that Polycrete (PC), at a concentration of 100 ppm, significantly reduced the viscosity of the concrete mixture at 30 °C, which positively influenced the casting and compaction process. However, further increases in concentration beyond this point led to a gradual rise in viscosity and a slight reduction in compressive strength. On the other hand, Epoxy Resin demonstrated an opposite trend; it increased the viscosity of the mixture and delayed cement hydration, especially at higher concentrations (20–30%), which negatively affected the fresh properties. Nevertheless, its performance at later ages (28–90 days) was more favorable, showing improved mechanical strength and durability due to forming a polymeric network in the cementitious matrix.These findings indicate that the selection of the polymer depends on the intended engineering purpose: Polycrete is more effective in improving fresh properties and reducing viscosity, whereas Epoxy Resin is more suitable for enhancing long-term strength and durability.