Experimental study on durability properties of kenaf fibre-reinforced geopolymer concrete

The construction industry has been focused on sustainability, particularly with regards to reducing CO2 emissions and recycling construction and demolition (C&D) waste. This study focuses on the alternative technology adaptation of carbonized pavement compact production by using waste concrete powder (WCP) which can be a substitute material to concrete and also able to absorb CO2. While material scientists embraced and developed this technological application, the financial perspective for adopting this technology has yet to be properly addressed. This paper conducts a feasibility assessment, which includes technical, environmental, social, and financial factors, from different stakeholders' perspectives (government, construction contractors, and material manufacturers) to launch the production of carbonized pavement compact by utilizing WCP. The benefit-cost analysis underlies the Evolutionary Game Model functions' formulation, which emphasizes not only the obvious financial benefits from WCP or its carbonized compacts sale but the benefits from the absorption of CO2 during the compacts production and avoiding WCP disposal at a landfill. The results based on a Hong Kong case (typical multistorey apartment building) identify promising scenarios where a minimum of 2300t of WCP is required for stakeholder interest in recycling, and a WCP wholesale price of 150HKD/t is suitable for the C&D contractor to participate in the recycling market. The study also estimates a cost-effective selling price of finished carbonized WCP compacts, which is competitive with similar products on the market. Important insights are drawn to initiate the WCP market and consequently increase the sustainability of the C&D recycling market. 

A feasibility analysis of waste concrete powder recycling market establishment: Hong Kong case

Mitigating greenhouse gas emissions through CO2 capture from industrial flue gases is imperative for addressing climate change. This article delves into the potential of natural tuff, derived from construction and demolition (C&D) waste, as an affordable and sustainable CO2 adsorbent for post-combustion capture. By tailoring the tuff structure and chemical composition through cation-exchange, the crucial role of cation type in enhancing its textural properties, particularly its microporosity and specific surface area, has been highlighted. Notably, Li- and Na-exchanges greatly enhance these properties, indicating a heightened potential for CO2 capture. The work further explores the dynamic CO2 adsorption of both untreated and modified tuff in a fixed-bed reactor under low CO2 partial pressures (<0.2 atm), particularly examining the effects of extra-framework cation nature (Na+, Li+) and composition, and the influence of NH4+ pre-treatment. Results show that Na- and Li-exchanged tuff exhibit enhanced CO2 uptake (up to 1 mmol g−1) compared to untreated tuff (0.54 mmol g−1), with Li-exchange resulting in the highest capacity due to both superior textural properties and stronger ion-quadrupole interactions with CO2 molecules. The multi-cyclic stability of the synthesized samples has been also assessed; regardless of the specific cation-exchange type, all the samples provide stable performances over 10 consecutive adsorption/desorption cycles. 

Waste-derived tuff for CO2 Capture: Enhanced CO2 adsorption performances by Cation-Exchange tailoring

Effect of the incorporation ratio of recycled concrete aggregate on the properties of self-compacting mortar

Sustainable zeolitic tuff incorporating tea waste fired ceramic bricks: Development and investigation

Feasibility of construction demolition waste for unexplored geotechnical and geo-environmental applications- a review

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Feasibility of construction demolition waste for unexplored geotechnical and geo-environmental applications- a review