Strength Prediction of Cold Asphalt Emulsion Mixtures Using the Maturity Method
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 5
Abstract
The lack of universal design standards for cold mix asphalt (CMA) has led to the use of laboratory–field correlation techniques to predict its strength. Such techniques disregard the gradual strength increase in CMA with curing time and temperature. This study developed strength–maturity functions to predict CMA strength. Virgin and recycled aggregates from reclaimed asphalt pavement (RAP) were considered. Specimens 100 mm in diameter and 63.5 mm in thickness were produced using the Marshall method. These were subjected to isothermal curing regimes and measured for indirect tensile strength. The early-age strength of the RAP mix cured at low temperatures of 25°C was lower than that of the virgin mix. However, after curing for 18 days, there was no significant difference in strength between the virgin and RAP mixes for all temperature regimes. Asphalt made from RAP mix had a higher temperature sensitivity factor () than that of the virgin mix. A linear–parabolic strength–maturity function predicted the strength of cold asphalt emulsion mixtures (CAEMs) with an accuracy greater than 95%. Thus, the proposed maturity method effectively predicts the strength of CAEMs.
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Data Availability Statement
Persons who may be interested in accessing the data used in this study may write to:
Director, Sustainable Materials Research and Technology Centre (SMARTEC) Jomo Kenyatta University of Agriculture and Technology (JKUAT), P.O. Box 62000-00200, Nairobi, Kenya.
Acknowledgments
We would like to thank the Materials Testing & Research Division (MT&RD) for availing the laboratory for data collection and the Sustainable Materials Research and Technology Centre (SMARTEC) of the Jomo Kenyatta University of Agriculture and Technology for material and technical support.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Mar 12, 2019
Accepted: Oct 21, 2019
Published online: Mar 2, 2020
Published in print: May 1, 2020
Discussion open until: Aug 2, 2020
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