The Effects of Mega Flow SP1 Superplasticizing Admixture on The Properties of Concrete

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Date

2014-08

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Addis Ababa University

Abstract

Superplasticizing admixtures interact chemically with the ingredients of concrete and affect the concrete properties in the fresh and hardened state. Now a days, its possible to produce concrete having better quality with the addition of superplasticizing admixture in different ways by saving some amount of mixing water and cement for a given mix design. The objective of this research was to study the effects of superplasticizing admixture on concrete properties, such as: workability, compressive strength, flexural strength and permeability. Therefore, in order to study those properties mega flow SP1 (chroride free, superplasticizing admixture based on selected sulphonated naphthalene polymers), type F complying with ASTM C494, BS EN 934-2 was used throughout the experiments. The experiments were performed on C-25 and C-60 concrete grades which have 0.58 and 0.33 water to cement ratio with a slump oabstractf 30-60mm and 10-30mm, respectively, at a dosage of 0%, 0.5%, 1% and 1.5% admixture. To facilitate the study, the experiments have been classified into four phases, such as: Phase I: to study the effects of superplasticizing admixture on workability, Phase II: to study the effects of way of superplasticizing admixture addition on concrete quality, Phase III: to study the effects of superplasticizing admixture on concrete quality by reducing amount of mixing water and Phase IV: to study the effects of superplasticizing admixture on concrete quality by reducing cement content. Based on the work results 1.5% superplasticizing admixture have shown higher value of workability and 1% superplasticizing has been provided the optimum results on strength in phase I and IV. In case of phase II by using 1% superplasticizing admixture, addition of admixture at the end was shown better result on workability, but the strength was improved by adding admixture at the middle of mixing. However, in case of phase III 1.5% superplasticizing addition has shown higher result on compressive, flexural and premiblity. Finally, the addition of superplasticizing admixture was shown improvement on workability, strength (compressive and flexural) and permeability from the reference concrete

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superplasticizing admixture

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