Abstract
Concrete is prone to cracking and one of the major causes of cracking is drying shrinkage of the hardened concrete. This research work was carried out to study the influence of partial replacement of some selected pozzolans on the drying shrinkage of concrete. Four pozzolans used in this study, were made to replace cement at various percentages resulting in various concrete mixes. Setting time test was conducted for the various cement mixes using Vicat’s apparatus and drying shrinkage test was done for the concrete test specimens. The results of the setting time indicate that partial replacement of pozzolans with ordinary Portland cement increases both the initial and final setting time of cement as the percentage replacement increases. Similarly, drying shrinkage results show that concrete made with Groundnut Shell Ash (GSA) and Locust Bean Pod Ash (LBA) at 12% replacement will have a stable and better shrinkage resistance than the control at both 56 days and 90 days. Meanwhile, the control concrete gives a better drying shrinkage at 28 days curing. In conclusion, the results show that pozzolanas [Bamboo Leaves Ash (BLA), Locust Bean Pod Ash (LBA), Sugarcane Bagasse Ash (SBA) and Groundnut Shell Ash (GSA)] can successfully replace cement up to 12% without necessarily affecting the shrinkage ability of the produced concrete. It also shows that Groundnut Shell Ash (GSA), Locust Bean Pod Ash (LBA) and Bamboo Leaves Ash (BLA) are more resistance to drying shrinkage than the control.
Highlights
Due to the versatility of the use of concrete as constructional materials [1], there is the need to study its constituents
The research investigates the influence of partial replacement of some selected pozzolans on the drying shrinkage of concrete
The results indicated that all the four pozzolanas (BLA, Locust Bean Pod Ash (LBA), Sugarcane Bagasse Ash (SBA) and Groundnut Shell Ash (GSA)) used can successfully replace cement up to 12% replacement without necessarily affecting the shrinkage ability of the produced concrete significantly
Summary
Due to the versatility of the use of concrete as constructional materials [1], there is the need to study its constituents. Admixtures are added to improve the quality of the concrete. Among these constituents, in term of cost, cement is the most expensive and contributes more to environmental pollution. One of the ways to reduce the quantity of cement used globally is to use a low cost material that has pozzolanic properties which can partially substitute Portland cement clinker. They are mostly industrial and agricultural waste products. Some of those materials that had been used to replace cement are periwinkle shell ash, clam shell ash, rice husk ash, egg shell ash, groundnut shell ash, palm kernel shell ash, coconut shell ash, etc. Afolayan [3]; Ikumapayi [4]; Oke, et al
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