A Study of the Behavior of Mortar Using Waste Materials from the Asphalt Concrete Production Process

Abstract

The asphaltic concrete production industry, which serves infrastructure engineering works, generates a large amount of fine dust waste during the hot-mix asphalt concrete manufacturing process. This fine dust easily becomes airborne, causing environmental pollution and respiratory problems for residents living nearby. To mitigate these impacts and promote the beneficial reuse of waste materials in engineering applications, thereby reducing the extraction of natural resources and lowering carbon dioxide emissions into the atmosphere, this research aims to study the flow spread, compressive strength, and drying shrinkage of mortar mixed with waste materials from the asphaltic concrete production process. The study consists of two parts: cement paste and cement mortar. In the first part, dust was added to the cement paste at replacement levels of 0%, 5%, 10%, 15%, 20%, and 25% by weight, with compressive strength tested at 7 days. In the second part, dust was used to replace cement in mortar at replacement levels of 0%, 10%, 20%, 30%, 40%, and 50% by weight, with compressive strength tested at 7, 14, and 28 days, respectively. For the drying shrinkage test, dust was used to replace cement at 0%, 10%, 20%, 30%, and 50% by weight, with shrinkage measured at 1, 2, 3, 7, 14, and 28 days, respectively. The results demonstrate the potential for using waste material from the asphaltic concrete production process to partially replace cement in appropriate proportions, providing a guideline for designing concrete mixtures for construction engineering applications.