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        Compressive Strength, Hydration and Pore Structure of Alkali-Activated Slag Mortars Integrating with Recycled Concrete Powder as Binders

        Hao Wang,Liang Wang,Wenfeng Shen,Ke Cao,Lei Sun,Pengju Wang,Liyun Cui 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.2

        Recycled concrete powder (RCP) recycling can reduce the consumption of natural resources, which has been highlighted as an ecofriendly and sustainable approach. The alkali-activated slag (AAS) offers notable prospects for replacing conventional Portland cement binders. In this study, we partially replaced granulated blast furnace slag (GBFS) with RCP to prepare the AAS mortars. We evaluated the effect of RCP replacement levels and fineness levels on compressive strength, early hydration process, and pore structure pertaining to AAS mortars with RCP (RCP-AAS mortars). According to the experimental results, using 10 – 30% RCP inside AAS mortars enhanced the compressive strength at 1 day, and the improvement was obvious with increasing RCP fineness. The RCP delayed the early-age hydration of the GBFS, decreased the content of hydration products and increased the total porosity. Therefore, it exhibited a negative effect on 28-day compressive strength. These drawbacks of RCP, however, could be modified by increasing its fineness.

      • KCI등재

        Hydration, Compressive Strength and Durability of Eco-friendly Cement Mortars Containing Recycled Brick Powder and Metakaolin

        Hao Wang,Liang Wang,Xin Qian,Ke Cao,Ying Xu,Yi Fang,Liyun Cui 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.9

        Grinding brick waste into powder for use as a supplementary cementitious material has shown to be a promising recycling method for the reuse of construction and demolition waste.However, the strength and durability of concrete containing recycled brick powder (RBP) will significantly decrease due to the poor pozzolanic activity of RBP, limiting its wider applications. This study attempted to overcome these defects through metakaolin (MK) addition. The hydration, compressive strength, durability, and environmental impact of eco-friendly mortars containing RBP and MK were investigated. The results showed that MK promoted the early-stage hydration of cement, creating a suitable hydration environment for the hydration of RBP at a later age. As a result, the volume fractions of low-density calcium silicate hydrate (C-S-H) and high-density C-S-H increased according to the nanoindentation test results. In addition, the strength, chloride penetration resistance, and reinforcement bar corrosion resistance of the blended mortars obviously improved due to the synergistic effect of RBP and MK. Lastly, we achieved CO2 emissions that were 22.1 – 30.2% lower and energy consumption that was 21.4 – 27.0% lower by incorporating 20% RBP and 5 – 15% MK.

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