Quality of cold-mix asphalt in bituminous pavement maintenance in Ghana: Preliminary indications

Prevalence of premature patch failures in bituminous pavement maintenance in Ghana, involving pothole and partial-depth repairs using cold-mix asphalt (CMA), has become a major concern as the failures call for repeated patching in the face of limited maintenance budget and repeated disruption to tra...

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Autores principales:	Kwadwo Appiah Boateng, Yaw Adubofour Tuffour, Daniel Obeng-Atuah, Stephen Agyeman
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Cold mix asphalt Bitumen content Aggregate gradation Sustainable cold patches Ghana Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/06f63fe78339447ebae7096d64de5e8c
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spelling	oai:doaj.org-article:06f63fe78339447ebae7096d64de5e8c2021-11-10T04:27:10ZQuality of cold-mix asphalt in bituminous pavement maintenance in Ghana: Preliminary indications2214-509510.1016/j.cscm.2021.e00769https://doaj.org/article/06f63fe78339447ebae7096d64de5e8c2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2214509521002849https://doaj.org/toc/2214-5095Prevalence of premature patch failures in bituminous pavement maintenance in Ghana, involving pothole and partial-depth repairs using cold-mix asphalt (CMA), has become a major concern as the failures call for repeated patching in the face of limited maintenance budget and repeated disruption to traffic. The most commonly documented failures associated with CMA patches in the country are disintegration, shoving, and dishing. All three failure modes suggest a deficiency in binder coupled with a weakness in aggregate functionality often attributable to a compromised aggregate skeletal structure lacking sufficient interlock/load-bearing ability resulting in a patch with no rigidity and stability. In this study, samples of stockpiled ready-to-use cold-mix asphalt concrete from six contractor sites and three failed patches from roads in the Ashanti, Volta, and Bono Regions in Ghana, were investigated to assess material quality. Bitumen extraction, aggregate gradation, stability, and volumetric analysis of compacted specimens were carried out on the samples. The results indicated poor CMA aggregate structure which consisted essentially of single-sized aggregates having uniformity coefficients between 4 and 6 and residual asphalt contents between 3% and 6%. All mixtures formulated using bitumen emulsion binder had values lower than those formulated with cutbacks and none satisfying specifications. Specimens compacted in the laboratory disintegrated during conditioning for stability and flow test, suggesting the absence of stickiness and cohesion within the compacted matrix. Our results suggest that pothole patching failures prevalent in the country may be blamed principally on inadequate aggregate structure and low binder content of the CMA mixes.Kwadwo Appiah BoatengYaw Adubofour TuffourDaniel Obeng-AtuahStephen AgyemanElsevierarticleCold mix asphaltBitumen contentAggregate gradationSustainable cold patchesGhanaMaterials of engineering and construction. Mechanics of materialsTA401-492ENCase Studies in Construction Materials, Vol 15, Iss , Pp e00769- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Cold mix asphalt Bitumen content Aggregate gradation Sustainable cold patches Ghana Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Cold mix asphalt Bitumen content Aggregate gradation Sustainable cold patches Ghana Materials of engineering and construction. Mechanics of materials TA401-492 Kwadwo Appiah Boateng Yaw Adubofour Tuffour Daniel Obeng-Atuah Stephen Agyeman Quality of cold-mix asphalt in bituminous pavement maintenance in Ghana: Preliminary indications
description	Prevalence of premature patch failures in bituminous pavement maintenance in Ghana, involving pothole and partial-depth repairs using cold-mix asphalt (CMA), has become a major concern as the failures call for repeated patching in the face of limited maintenance budget and repeated disruption to traffic. The most commonly documented failures associated with CMA patches in the country are disintegration, shoving, and dishing. All three failure modes suggest a deficiency in binder coupled with a weakness in aggregate functionality often attributable to a compromised aggregate skeletal structure lacking sufficient interlock/load-bearing ability resulting in a patch with no rigidity and stability. In this study, samples of stockpiled ready-to-use cold-mix asphalt concrete from six contractor sites and three failed patches from roads in the Ashanti, Volta, and Bono Regions in Ghana, were investigated to assess material quality. Bitumen extraction, aggregate gradation, stability, and volumetric analysis of compacted specimens were carried out on the samples. The results indicated poor CMA aggregate structure which consisted essentially of single-sized aggregates having uniformity coefficients between 4 and 6 and residual asphalt contents between 3% and 6%. All mixtures formulated using bitumen emulsion binder had values lower than those formulated with cutbacks and none satisfying specifications. Specimens compacted in the laboratory disintegrated during conditioning for stability and flow test, suggesting the absence of stickiness and cohesion within the compacted matrix. Our results suggest that pothole patching failures prevalent in the country may be blamed principally on inadequate aggregate structure and low binder content of the CMA mixes.
format	article
author	Kwadwo Appiah Boateng Yaw Adubofour Tuffour Daniel Obeng-Atuah Stephen Agyeman
author_facet	Kwadwo Appiah Boateng Yaw Adubofour Tuffour Daniel Obeng-Atuah Stephen Agyeman
author_sort	Kwadwo Appiah Boateng
title	Quality of cold-mix asphalt in bituminous pavement maintenance in Ghana: Preliminary indications
title_short	Quality of cold-mix asphalt in bituminous pavement maintenance in Ghana: Preliminary indications
title_full	Quality of cold-mix asphalt in bituminous pavement maintenance in Ghana: Preliminary indications
title_fullStr	Quality of cold-mix asphalt in bituminous pavement maintenance in Ghana: Preliminary indications
title_full_unstemmed	Quality of cold-mix asphalt in bituminous pavement maintenance in Ghana: Preliminary indications
title_sort	quality of cold-mix asphalt in bituminous pavement maintenance in ghana: preliminary indications
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/06f63fe78339447ebae7096d64de5e8c
work_keys_str_mv	AT kwadwoappiahboateng qualityofcoldmixasphaltinbituminouspavementmaintenanceinghanapreliminaryindications AT yawadubofourtuffour qualityofcoldmixasphaltinbituminouspavementmaintenanceinghanapreliminaryindications AT danielobengatuah qualityofcoldmixasphaltinbituminouspavementmaintenanceinghanapreliminaryindications AT stephenagyeman qualityofcoldmixasphaltinbituminouspavementmaintenanceinghanapreliminaryindications
_version_	1718440622510047232

Quality of cold-mix asphalt in bituminous pavement maintenance in Ghana: Preliminary indications

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