Abstract
Yam Peels are the wastes produced when yam are processed for human consumption. This research investigated the structural strength characteristics of concrete with Yam peel ash (YPA) used as partial substitute for cement. The YPA was subjected to pozzolanicity and setting time tests to ascertain it potential as a pozzolan. Water/cement ratio of 0.6 was used to produce the blended concrete of mix 1:2:4, 1:3:6, 1:4:8 by which cement was replaced partially by YPA at 5%, 10%, 15% and 20% replacement by weight of cement. A total of 64 concrete cubes of size 50×50×50mm were molded and cured for 7, 14, 21 and 28 days. While 36 concrete beams of size 50×50×150mm were molded and cured for 7 and 28days. The workability, compressive strength and flexural test were conducted. The result revealed that the water/cement ratio is adequate to make the blended concrete workable. The best 28<sup>th</sup> day compressive strength of the blended concrete was observed for mix ratio of 1:3:6 at 5% YPA replacement of cement with a value of 9.857N/mm<sup>2</sup>, an approximate 64% of the strength of the concrete without replacement of cement. The best flexural strength of the concrete was observed at mix ratio of 1:2:4 at 5% YPA replacement with a value of 5.112N/mm<sup>2</sup>, an approximate 97% of the strength of the concrete without replacement of cement. The result further revealed that the increase in %YPA replacement of cement does not have any significant effect on the density of the test specimens of the blended concrete.
Highlights
Availability of affordable housing is very essential to the human race because it helps to fulfill human basic need for shelter and improve the vitality of the economics of communities and/or world as a whole [1]
Strength was obtained from Universal Testing Machine (UTM)
The result revealed that the increase in %Yam Peel Ash (YPA) replacement of cement does not have any significant effect on the density of the test specimens of the blended concrete
Summary
Availability of affordable housing is very essential to the human race because it helps to fulfill human basic need for shelter and improve the vitality of the economics of communities and/or world as a whole [1]. According to Ofuyatan, et al [3], almost 60% of total cost of constructing an affordable house is ascribed tobuilding/construction materials such as concrete, sandcrete blocks and steel. During this Covid-19 era, there has been remarkable increase in the price of these building materials due to drastic reduction in their production which arise as a result of depletion in resources used and labor required. Sandcrete blocks and concrete are the most commonly used construction material because of its economical values, resilience, and flexibility [4, 5]. Reference [6] indicated that sandcrete blocks and concrete are important construction because more than 90% of physical infrastructures in Nigeria are being constructed using them
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