Properties of groundnut shell (&lt;i&gt;Arachis hypogaea&lt;/i&gt;) ash blended portland cement

C.M Ikumapayi

doi:10.4314/jasem.v22i10.03

Abstract

The study of the properties of groundnut shell ash (GSA) obtained at 500oC revealed that the ash is a pozzolanic material. Its pozzolanicity was studied by Chemical analysis test conducted with the aid of Minipal 4 Energy Dispensing X-ray Fluorescence Spectrometer (EDXRF) as well other physical tests conducted on the material. Hydration behavior of 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14% and 16% by weight of GSA blended ordinary Portland cement (OPC) was studied through workability measurement, setting time measurement and compressive strength measurement; it was found that at 28 days of hydration the compressive strength value for 12 wt% GSA blended cement concrete was quite comparable to that of concrete made from OPC. However, the highest compressive strength was obtained at 4 wt% GSA replacement with OPC. Chloride Ion penetration of OPC, OPC with 4% GSA and OPC with 12% GSA were then determined using Rapid Migration test. The result showed that application of 12% GSA blended OPC cement in concrete increases the resistance of such concrete to chloride ion penetration.Keywords: Groundnut shell ash, Rapid migration test, chloride ion penetration, compressive strength

Highlights

Concrete is the most essential sustainable construction material which is widely used all over the world as it provides superior fire resistance, gains strength over time, gives an extremely long service life and capable of being moulded into different shapes (Neville, 2011)
The results show that concrete made with 4% groundnut shell ash (GSA) has a better chloride ion resistance than concrete made with ordinary Portland cement (OPC) and that of 12% GSA gave a better result than 12% GSA
The results show that GSA is a pozzolanic material

Summary

Introduction

Concrete is the most essential sustainable construction material which is widely used all over the world as it provides superior fire resistance, gains strength over time, gives an extremely long service life and capable of being moulded into different shapes (Neville, 2011). Besides energy consumption and emission of harmful gases, one positive benefit is that calcium hydroxide, one the hydration products during the hydration of cement is a bonus for construction industry especially when allowed to react with pozzolans. This affects the durability characteristics of Portland cement pastes, mortar and concrete (Singh et al 2007). Et al (2013) reported about the pozzolanicity of some biogenic agricultural wastes such as bamboo leaf ash, coconut shell ash, rice hush ash among others When these materials are mixed with Portland cement, blended cement or composite cement are obtained. The effects of replacing cement with GSA at different percentages were investigated on the compressive strength, workability, setting time and chloride ion penetration of the various concrete mixes

Objectives

Methods

Results

Conclusion