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Buildings 2018, 8(9), 115; https://doi.org/10.3390/buildings8090115

Experimental Investigation on Engineering Properties of Concrete Incorporating Reclaimed Asphalt Pavement and Rice Husk Ash

1
Civil Engineering Department, Pan African University Institute for Basic Sciences, Technology and Innovation (PAUSTI), 62000 00200 Nairobi, Kenya
2
Ethiopian Roads Authority, Addis Ababa 1770, Ethiopia
3
Civil Engineering Department, Rongo University, Rongo 103-40404, Kenya
4
Civil Engineering Department, Jomo Kenyatta University of Agriculture and Technology (JKUAT), Nairobi 5505, 00100, Kenya
*
Author to whom correspondence should be addressed.
Received: 11 June 2018 / Revised: 5 July 2018 / Accepted: 9 July 2018 / Published: 23 August 2018
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Abstract

Waste generation from agricultural and construction industries is growing at an upsetting rate that causes a heavy burden on landfill facilities. On the other hand, the construction industry is exhausting natural resources thereby posing environmental problems. This study investigates the potential use of agro-industrial waste such as rice husk ash (RHA) and construction waste like reclaimed asphalt pavement (RAP) as promising construction materials. The durability and physical and mechanical properties of concrete were assessed by partially replacing cement and virgin aggregates with RHA and RAP, up to 20% and 50%, respectively. A total of 22 mixes were studied, twelve of which were devoted to studying the collective effects of RHA and RAP on the engineering properties of concrete. Based on experimental results, RHA and RAP decreased slump, compacting factor, density, water absorption and sorptivity. RHA increased compressive and tensile splitting strength, whereas RAP decreased compressive and tensile splitting strength. Comparable strength and favorable sorptivity values were obtained when 15% RHA was combined with up to 20% RAP in the concrete mix. Thus, utilizing RHA and RAP as concrete ingredients can contribute to solid waste management, engineering and economic benefits. View Full-Text
Keywords: slump; compacting factor; density; water absorption; sorptivity; durability; compressive strength; tensile splitting strength; volumes of permeable void spaces slump; compacting factor; density; water absorption; sorptivity; durability; compressive strength; tensile splitting strength; volumes of permeable void spaces
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Getahun, M.A.; Shitote, S.M.; Gariy, Z.C.A. Experimental Investigation on Engineering Properties of Concrete Incorporating Reclaimed Asphalt Pavement and Rice Husk Ash. Buildings 2018, 8, 115.

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