Journal of Materials and Engineering Structures
Volume 12, Numéro 4, Pages 457-467
2025-12-30

Utilization Of Recycled Concrete Aggregates Mixed With Fly Ash As The Road Base Materials In Vietnam



Authors : Thai Hong Nam .

Abstract

Recycling of construction and demolition waste (CDW) and industrial by-products presents substantial environmental, economic, and social benefits. In developed countries, recycling efforts have been actively promoted for decades, resulting in a high proportion of CDW and industrial by-products being reutilized. However, in developing nations, including Vietnam, the recycling rate of such materials remains relatively low. This study investigates the utilization of the mixtures of recycled concrete aggregates (RCA) and fly ash (FA) as road base materials in Vietnam. In which, FA functions as the fines within the aggregate gradation and is varied from 0% to 20%. A series of laboratory tests was conducted to assess the mechanical behavior of the prepared samples. The findings demonstrate that FA can effectively substitute fines in aggregate mixtures for road base layers, with an optimal content of 5%. The pozzolanic reaction of FA contributes to an enhancement in the California Bearing Ratio (CBR) of RCA-FA mixtures compared to that of natural aggregates, ensuring compliance with required bearing capacity standards, except for specimens containing 20% FA. Moreover, the adhesive mortar generated through the pozzolanic reaction of FA exhibits lower bonding strength than that formed by RCA fines, leading to a lower CBR value and a higher particle breakage index in RCA-FA mixtures compared to RCA-only samples.

Keywords

Recycled concrete aggregates (RCA) ; Fly ash ; Road base materials ; Fines content

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