Value-added utilisation of recycled concrete in hot-mix asphalt

Journal Article · Sun Jul 01 04:00:00 EDT 2007 · Waste Management

DOI:https://doi.org/10.1016/j.wasman.2006.02.001· OSTI ID:20877616

Wong, Yiik Diew ^[1]; Sun, Darren Delai ^[1]; Lai, Dickson ^[1]

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1. School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)

The feasibility of partial substitution of granite aggregate in hot-mix asphalt (HMA) with waste concrete aggregate was investigated. Three hybrid HMA mixes incorporating substitutions of granite fillers/fines with 6%, 45% untreated, and 45% heat-treated concrete were evaluated by the Marshall mix design method; the optimum binder contents were found to be 5.3%, 6.5% and 7.0% of grade Pen 60/70 bitumen, respectively. All three hybrid mixes satisfied the Marshall criteria of the Singapore Land Transport Authority (LTA) W3B wearing course specification. The hybrid mix with 6% concrete fillers gave comparable resilient modulus and creep resistance as the conventional W3B mix, while hybrid mixes with higher concrete substitutions achieved better performance. X-ray diffraction (XRD) showed the distinct presence of free lime in the heat-treated concrete, while the scanning electron microscope (SEM) provided an in-depth perspective of the concrete grains in the HMA matrix. The results suggest feasible use of waste concrete as partial aggregate substitution in HMA.

• OSTI ID: 20877616
• Journal Information: Waste Management, Journal Name: Waste Management Journal Issue: 2 Vol. 27; ISSN WAMAE2; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ASPHALTS
CONCRETES
GRANITES
HEAT TREATMENTS
LAND TRANSPORT
SCANNING ELECTRON MICROSCOPY
SPECIFICATIONS
X-RAY DIFFRACTION