Long-Term Development of Strength of Cement Paste with Fly Ash

Abstract

The paper deals with the long-term development of strength of cement paste with fly ash. If the fly ash replaces the clinker in the cement or concrete mixture, the properties of the fresh and hardened material are affected. The slower increase in the strength of concrete is one of the biggest negative impacts. However, there are applications where it does not matter - e.g. massive concrete structure. It is important due to the ever increasing requirement from society for saving material and energy and durability of structures monitoring long-term behavior of such modified material. Three different mixtures were made for this experiment - cement paste without fly ash and cement paste with replacement of 40 and 50% of cement by fly ash. The evaluation of the measurement of compressive and tensile strength after 28, 90, 180 days and 5 years is presented in this paper.