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Removal of cement mortar remains from recycled aggregate using pre-soaking approaches

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  • Tam, Vivian W.Y.
  • Tam, C.M.
  • Le, K.N.

Abstract

With a rising tide of adoption of recycled aggregate (RA) for construction, investigation on ways to improve the quality of RA has been overwhelming. The adoption of RA brings benefits including savings in the limited landfill spaces and the use of natural resources. However, the poorer quality of RA often limits its utilization to low grade applications such as sub-grade activities, filling materials and low grade concrete. The major reason that affects the quality of RA is the large amount of cement mortar remains on the surface of the aggregate, resulting in higher porosity, water absorption rates and thus a weaker interfacial zone between new cement mortar and aggregates, which weakens the strength and mechanical performance of concrete made from RA. This paper attempts to study three pre-soaking treatment approaches; namely ReMortarHCl, ReMortarH2SO4 and ReMortarH3PO4 in reducing the mortar attached to RA. The results show that the behaviour of RA has improved with reduction in water absorption, without simultaneous exceeding the limits of chloride and sulphate compositions after the treatment. This work has also compared the compressive strength, flexural strength and modulus of elasticity of concrete made from the approaches, which shows marked improvements in quality when compared with those using traditional approaches.

Suggested Citation

  • Tam, Vivian W.Y. & Tam, C.M. & Le, K.N., 2007. "Removal of cement mortar remains from recycled aggregate using pre-soaking approaches," Resources, Conservation & Recycling, Elsevier, vol. 50(1), pages 82-101.
    • Handle: RePEc:eee:recore:v:50:y:2007:i:1:p:82-101
    DOI: 10.1016/j.resconrec.2006.05.012
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    References listed on IDEAS

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    1. Helen Lingard & Peter Graham & Guinevere Smithers, 2000. "Employee perceptions of the solid waste management system operating in a large Australian contracting organization: implications for company policy implementation," Construction Management and Economics, Taylor & Francis Journals, vol. 18(4), pages 383-393.
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    Cited by:

    1. Wijayasundara, Mayuri & Mendis, Priyan & Zhang, Lihai & Sofi, Massoud, 2016. "Financial assessment of manufacturing recycled aggregate concrete in ready-mix concrete plants," Resources, Conservation & Recycling, Elsevier, vol. 109(C), pages 187-201.
    2. Daniele Kulisch & Amnon Katz & Semion Zhutovsky, 2022. "Quantification of Residual Unhydrated Cement Content in Cement Pastes as a Potential for Recovery," Sustainability, MDPI, vol. 15(1), pages 1-24, December.
    3. Tam, Vivian W.Y. & Le, Khoa N., 2007. "Aggregate testing using 2nd-, 7th- and 10th-order interpolation polynomials," Resources, Conservation & Recycling, Elsevier, vol. 52(1), pages 39-57.
    4. Aneeta Mary Joseph & Stijn Matthys & Nele De Belie, 2022. "Properties of Concrete with Recycled Aggregates Giving a Second Life to Municipal Solid Waste Incineration Bottom Ash Concrete," Sustainability, MDPI, vol. 14(8), pages 1-16, April.
    5. Anna M. Grabiec & Jeonghyun Kim & Andrzej Ubysz & Pilar Bilbao, 2021. "Some Remarks towards a Better Understanding of the Use of Concrete Recycled Aggregate: A Review," Sustainability, MDPI, vol. 13(23), pages 1-19, December.
    6. Haseog Kim & Sangki Park & Hayong Kim, 2016. "The Optimum Production Method for Quality Improvement of Recycled Aggregates Using Sulfuric Acid and the Abrasion Method," IJERPH, MDPI, vol. 13(8), pages 1-14, July.
    7. Lotfi, Somayeh & Deja, Jan & Rem, Peter & Mróz, Radosław & van Roekel, Eric & van der Stelt, Hans, 2014. "Mechanical recycling of EOL concrete into high-grade aggregates," Resources, Conservation & Recycling, Elsevier, vol. 87(C), pages 117-125.
    8. Yuh-Shan Ho, 2019. "Comment on Chen, J.; Su, Y.; Si, H.; Chen, J. Managerial Areas of Construction and Demolition Waste: A Scientometric Review. Int. J. Environ. Res. Public Health 2018, 15 , 2350," IJERPH, MDPI, vol. 16(10), pages 1-4, May.
    9. Ting Wang & Kaiyi Li & Defu Liu & Yang Yang & Dong Wu, 2022. "Estimating the Carbon Emission of Construction Waste Recycling Using Grey Model and Life Cycle Assessment: A Case Study of Shanghai," IJERPH, MDPI, vol. 19(14), pages 1-16, July.

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