Abstract
Recycling of construction debris in Singapore is an important practice given the large amount generated annually. In order to maximise the rate of recycled concrete aggregate (RCA) generated from construction debris, porous asphalt mixture (PAM) made of 100% RCA was studied in both mechanical and functional aspects. Altogether, three designs of PAMs were evaluated, namely (a) PAM–RCA mixture comprising 100% RCA, (b) PAM–RCA–TAFPACK-Super (TPS) mixture comprising 100% RCA with enhanced asphalt binder, and (c) PAM–granite mixture comprising 100% granite, with PAM–granite mixture serving as the control. A series of laboratory tests were conducted, namely the draindown test, Cantabro test, Marshall test, permeability test, and ageing test. The results showed that PAM made of 100% RCA (PAM–RCA mixture) can offer the basic drainage function and possesses potential for low-strength application, i.e. pedestrian/cyclist pathways. Meanwhile, PAM made of 100% RCA and modified by specific additive TPS (PAM–RCA–TPS mixture) can adequately fulfil the Marshall criteria of Singapore's Land Transport Authority Standard stipulated for normal roads, indicating its potential usage in normal highway application. The results suggest the feasible application of 100% RCA in PAM.
Published Version
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