The effect of plasticizing admixture on the physical and mechanical properties of concrete with limestone cement

Abstract

The article analyzes the effect of plasticizing admixture content on the physical and mechanical properties of concrete made of 50 % coarse aggregate. The plasticizer dosage levels proposed by the manufacturer (0.2 %-1.2 %) were examined and the optimum plasticizer dose (0.8 %-1.0 %) was established. The use of limestone Portland cement and the optimum content (0.8 %-1.0 %) of plasticizing admixture in the production of concrete increases the compressive strength, density, frost resistance, whereas the water absorption is reduced. The test results have revealed that plasticizing admixture insufficient or overdosing can reduce the physical-mechanical properties of concrete. With the optimum content of plasticizing admixture durable and frost resistant concrete can be obtained.

Impact of Superplasticizer on Rheological Properties and Hardening Process of Different Portland Cement Pastes

“…In plasticized cement pastes of the same initial flow the hydration and hardening process are going faster comparing with non-plasticized. Many authors indicate that PCE slows down the hydration of cement [15,20,21]. In our investigations the more intense hydration, setting and development of hardening structure in plasticized pastes was most likely determined by a considerably lower W/C in them.…”

The Influence of Admixtures on the Technological Properties of Fresh Concrete Mixture

“…It is widely known that the usage of SP admixture increases mixture`s workability properties [3]. SP content has an effect on the physical, mechanical and structural properties of concrete as well [4]. It is also observed that the workability properties of concrete mixtures can be modified with the addition of mineral additives.…”