Feasibility of using recycled concrete aggregates for half-warm mix asphalt

Abstract

The present study describes a laboratory investigation on the feasibility of reusing construction and demolition waste as recycled concrete aggregate (RCA) to manufacture half-warm mix asphalt (HWMA) instead of natural aggregates. In this investigation, semi-dense HWMA for the binder course, type AC 22 bin S, was analysed. Percentages of 0% (control mixture), 55%, and 100% RCA were used instead of natural aggregates (hornfels). Cationic bitumen emulsion, type C60B4, was used to manufacture the aforementioned mixtures. First, the aggregates and bitumen emulsion mixing temperatures and mixing times were determined. Subsequently, volumetric properties, water resistance, resilient modulus, and resistance to permanent deformation were determined. All the samples were manufactured using Marshall compaction. The results indicate that it was possible to dose HWMA made with 55% RCA. The mixture exhibited increased bitumen consumption when compared to that of the control mixture (0% RCA) as well as increased air void content, increased stripping potential, less stiffness, and increased rutting potential. Nevertheless, the results satisfy the required conditions for low-traffic volume roads.

Effect of Recycled Concrete Aggregate Addition on the Asphalt Mixtures Performance: ITZ Area, Microstructure, and Chemical Analysis Perspectives

“…In light of the moisture sensitivity test being particularly significant for nations that experience cold weather, the obtained findings are quite encouraging and meaningful for RCA usage. The obtained results confirmed previous investigations [10,51,56]. In addition, the experimental findings showed that all TSR values for mixes, including different kinds of untreated CRCA with varying percentages, are higher than the minimum criteria for a previous study, registering an efficient outcome for the mixes that included RCA [57].…”

Performance of High Rap Half-Warm Mix Asphalt

“…Bituminous mixtures can be manufactured using recycled aggregates such as construction and demolition waste (C&DW) [5] or reclaimed asphalt pavement (RAP). If RAP is used in the manufacture of WMA or HWMA, additional environmental benefits could be achieved, such as reduced waste, conservation of natural resources [6], and reduced consumption of aggregates and bitumen.…”

Evaluation of the Performance of Waste Marble Dust as a Mineral Filler in Hot-Mix Asphalt Concrete

“…This gave rise to the concept of sustainable construction which is understood as "ensuring the provision of current built environment needs without compromising resources needed to meet the needs of future generations. [7]" Hence, in achieving the objectives of sustainable construction in the road pavement industry, two main approaches have been followed -1) the development of new asphalt mixing and laying technologies and 2) the adoption of residues (wastes) and industrial by-products [8]. The adoption of waste materials that otherwise constitutes an environmental nuisance performs two roles in the achievement of sustainability.…”