Engineering characteristics of road aggregates from northern Pakistan and the development of a toughness index |
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Authors: | M A Kamal M A Sulehri D A B Hughes |
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Institution: | (1) Department of Civil Engineering, University of Engineering and Technology, Taxila, Pakistan;(2) Regional Manager, Nespak, Quetta, Pakistan;(3) School of Civil Engineering, The Queen’s University of Belfast, Belfast, BT7 1NN, Northern Ireland, UK |
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Abstract: | This paper summarizes an extensive series of common durability, shape and strength tests carried out on road aggregates from
quarries in northern Pakistan by Sharif et al. at the University of Engineering and Technology, Taxila. The data from these
standard tests have been correlated for a particular aggregate type to show the close relationship between these measured
physical characteristics. The paper outlines how, once these relationships have been established for a particular aggregate
source, it is feasible to simplify the testing or quality assurance regime and monitor only some of these characteristics
to assess the overall quality of the aggregate. The physical characteristics have then been combined into a linear relationship,
using coefficients estimated from the extensive data set in the paper, to give a single characteristic for an aggregate type
known as the Toughness Index (TI). The TI is therefore based on the main strength and durability characteristics of the aggregates
and can be used as an indicator of the overall quality of the aggregate. |
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Keywords: | aggregate durability quality assurance roadbase strength subbase Toughness Index unbound material |
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