Available online at www.pelagiaresearchlibrary.com Pelagia Research Library Advances in Applied Science Research, 2012, 3 (6):3658-3662 ISSN: 0976-8610 CODEN (USA): AASRFC 3658 Pelagia Research Library Compressive strength and workability of concrete using natural pozzolana as partial replacement of ordinary portland cement Osei D. Y. 1 and Jackson E.N. 2 1 Department of Civil Engineering, Cape Coast Polytechnic, Cape Coast. Ghana. 2 Department of Building Technology, Cape Coast Polytechnic, Cape Coast, Ghana. _____________________________________________________________________________________________ ABSTRACT The increasing cost and scarcity of portland cement has impacted negatively on the delivery of affordable housing and infrastructural development in developing countries like Ghana. This study investigated the use of natural clay pozzolana as partial replacement of portland cement in the production of concrete. Concrete cubes measuring 150mm 150mm 150mm were made from six different concrete mixes prepared by using pozzolana to replace 0%,10%, 20%, 30%, 40% and 50% of portland cement by mass. The workabilities of the fresh concrete mixes were evaluated using the slump test and compacting factor test while compressive strengths of concrete cubes were evaluated at 7, 14, 21 and 28 days. The maximum compressive strength at all ages of testing was obtained at 30% replacement, corresponding to an increase of 3%,12%,24% and 19% compared to the 7-day, 14-day, 21-day and 28-day compressive strengths. Workability decreased with an increase in replacement percentage. Pozzolana can be used to partially replace ordinary portland cement in the production of concrete without compromising strength. Keywords: cement, pozzolana, concrete, compressive strength, workability _____________________________________________________________________________________________ INTRODUCTION Concrete is the world’s most utilized construction material [1]. The need for infrastructural development in both the developing and developed countries has placed a great demand on ordinary portland cement (OPC), traditionally, the main binder in the manufacture of concrete. Despite the advantages of concrete as a construction material, the production of cement comes at a great cost to the environment [1, 2, 3, 4]. In view of environmental and sustainability concerns associated with the production of cement, the use of pozzolanas to replace part of portland cement is receiving a lot of attention. Replacing portland clinker either partially or entirely is also being investigated as an alternative to carbon dioxide emissions [2]. Up 70% of portland cement can be replaced by using materials such as primarily fly ash, slag, silica fume, natural pozzolanas, rice-husk ash, wood ash, and agricultural products ash [5].Artificial pozzolanas used in modern commercial cement are derived from fly ash produced by coal burning plants; incineration of municipal solid waste etc [6]. .Pozzolanic materials do not possess any cementing properties of their own, but they contain silica and alumina in reactive form. Ancient Romans produced exceptional cement by mixing pozzolanic materials with lime to build structures some of which are standing today [6]. Pozzolanic materials chemically react with calcium hydroxide in the presence of water to form compounds possessing cementitious properties [6]. The pozzolanic reactions are silica reactions in the presence of calcium
Compressive strength and workability of concrete using natural pozzolana as partial replacement of ordinary portland cement
May 03, 2023
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