Feasible techniques for valorisation of construction and demolition waste for concreting applications

Bandara, H.M.S.; Thushanth, G.; Somarathna, H.M.C.C.; Jayasinghe, D.H.G.A.E; Raman, Sudharshan Naidu

doi:10.1007/s13762-022-04015-z

Cited by 8 publications

(1 citation statement)

References 67 publications

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“…Several approaches have been proposed for CDW recycling worldwide. The reuse of different types of CDW, including crushed concrete, brick, mortars, and plaster as recycled aggregates, has been intensively studied (Bolouri Bazaz and Khayati, 2012;Xuan et al, 2012;Silva et al, 2014;Bravo et al, 2015;Martínez et al, 2016;Braga et al, 2017;Omary et al, 2018;Bandara et al, 2022;He et al, 2022). However, the crushed CDW suffers diverse drawbacks including high water absorption, low strength, significant quality fluctuation, and cracks compared to natural aggregates (Tam and Tam, 2007;Shi et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Recycling of Precast Concrete Waste Sludge With Paper Mill and Biomass Ashes for Lightweight Granulated Aggregate Production

et al. 2022

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The construction and demolition waste generation is increasingly evolving with the rapid urbanization, with more than a quarter of the produced waste being landfilled without further treatment or recycling strategy. Hence, sustainable management and valorization methods such as recycling in construction materials is becoming increasingly essential to tackle the economic and environmental burdens of landfilling waste. Construction and demolition waste recycling has been intensively studied. However, the present study proposes a promising solution for recycling construction and demolition wastes (CDWs) from the precast concrete waste sludge and ashes from paper mill sludge and biomass. Artificial lightweight aggregates were designed and produced by alkali activating a mixture of 50–90 wt% of dried and milled CDW with 3–25 wt% of ash and 5–35 wt% of blast furnace slag. The properties of the produced aggregates were assessed via density, water absorption, porosity, and crushing tests, in addition to microstructural characterizations using XRD and scanning electron microscopy SEM analysis. The optimum NaOH concentration was 8M with the highest mechanical properties and lowest efflorescence. The produced aggregates revealed a high crushing force of 82 N at 28 days with 50 wt% CDW, 15 wt% biomass ash, and 25 wt% blast furnace slag presenting a possible recycling pathway for such side-stream materials.

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