IIARD International Institute of Academic Research and Development

RESEARCH JOURNAL OF PURE SCIENCE AND TECHNOLOGY (RJPST )

E-ISSN 2579-0536
P-ISSN 2695-2696
VOL. 8 NO. 3 2025
DOI: 10.56201/rjpst.vol.8.no3.2025.pg8.19

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Effect of Clay Soil from Mbiama on the Mechanical and Moisture Damage Properties of Asphaltic Concrete

Toscanini D S and Nelson A

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Abstract

Many studies have shown the damaging effect of moisture on conventional asphalt concrete when submerged in water for a time period under the application of traffic load. This study is aimed at determining the effect of partially replacing the mineral filler portion of the total mix with 2-14% clay, sourced from Mbiama on asphaltic concrete. The Marshall Stability Design Method was used to determine the optimum bitumen content of 5% and to evaluate asphalt concrete properties after soaking durations of 2, 4, and 7 days. The clay used for the study underwent Atterberg Limit Test for classification. The results show that the clay adhered to OL and A-3 in both the USC and AASTHO soil classification systems. The Marshall Stability value for the control sample increased from 8.4 kN to 16.54 kN at 4% clay addition, given a 49% increase in stability over the control sample. Soaked clay modified asphalt concrete samples maintained a significant retained stability across all soaking duration with superior moisture resistance capabilities.

keywords:

Marshall, Stability, Flow, Mbiama, Clay, Flood, Modified, Asphalt, Concrete

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