A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Value-added utilisation of recycled concrete in hot-mix asphalt
The feasibility of partial substitution of granite aggregate in HMA (hot-mix asphalt) 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 LTA (Land Transport Authority) 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. XRD (X-ray diffraction) showed the distinct presence of free lime in the heat-treated concrete, while the SEM (scanning electron microscope) 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.
Value-added utilisation of recycled concrete in hot-mix asphalt
The feasibility of partial substitution of granite aggregate in HMA (hot-mix asphalt) 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 LTA (Land Transport Authority) 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. XRD (X-ray diffraction) showed the distinct presence of free lime in the heat-treated concrete, while the SEM (scanning electron microscope) 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.
Value-added utilisation of recycled concrete in hot-mix asphalt
Wong, Yiik Diew (author) / Sun, Darren Delai (author) / Lai, Dickson (author)
Waste Management ; 27 ; 294-301
2007
8 Seiten, 9 Bilder, 6 Tabellen, 18 Quellen
Article (Journal)
English
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