Use of Natural Pozzolanic Material as Partial Replacement Ordinary Portland Cement (OPC) in Concrete

Rahim Ishak,Jau Choy Lai,Sinatu Sadiah Shapie

doi:10.6007/ijarbss/v10-i9/7987

Abstract

Fly ash is a powder material of burned coal from thermal power stations which produces cementitious and pozzolanic material. Commonly use of fly ash in concrete for building construction contributes conducive environmental and also reduces the effect of pollutant in site project. Therefore, this study was conducted to investigate the use of fly ash as partial replacement of cement in concrete as a mean of producing more environmental friendly concrete. The content of fly ash as partial replacement of ordinary portland cement(OPC) is investigated by weight accordingly in range 0%(without fly ash), 10%, 20% and 30% for grade 25. The chemical composition of fly ash was determine using X-ray Fluorescence (XRF). The scanning electron microscope (SEM) was used to determine particle size, shape and texture of fly ash. The mix proportion of concrete was determine using mix design method according to British Standard. The workability of the fresh concrete mixture was evaluated using slump test while compressive strength of cubes concrete was evaluated at 7, 14, 28 and 56 days. A total of 48 cubes concrete with size 100mmx100mmx100mm were made. The optimum compressive strength at all ages of testing was obtained at 10% replacement. Workability decreased with an increased in replacement percentage of fly ash. The results therefore show that fly ash as pozzolanic materials can be used to partially replace ordinary portland cement in production of concrete.

Highlights

The rapid development of the construction industry in Malaysia requires the use of very high materials, especially concrete building materials
The chemical compositions of cement and fly ash that used in this study shows in Table 1 while Figure 1 shows the particle size, shape and texture of fly ash
According to ASTM 618-05, class F of fly ash stated as silicon dioxide (SiO2) + aluminium oxide (AI2O3) + iron oxide (Fe2O3) is not less than 70% and calcium oxide (CaO) is less than 10%

Summary

Introduction

The rapid development of the construction industry in Malaysia requires the use of very high materials, especially concrete building materials. Replacement materials are usually available in large quantities and can be used to replace Portland cement in green concrete, which include Fly Ash (Fly Ash is a solid waste product dumped in large quantities by thermal Power Plants in Malaysia). Fly ash is a pozzolanic material that containing aluminous and siliceous material that forms cement in the presence of water. Gourav et al, (2014) said the classification of Fly Ash were depending on lime content and focused on lime reactivity. These value indicates the reactivity of pozzolanic materials measures by testing a standard cube specimen for compressive strength following the guidelines of I.S. 3812 code

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