A gentle acid-wash and pre-coating treatment of coral aggregate to manufacture high-strength geopolymer concrete

Article

Wang, Aiguo, Lyu, Bangcheng, Zhu, Yingcan, Liu, Kaiwei, Guo, Liping and Sun, Daosheng. 2021. "A gentle acid-wash and pre-coating treatment of coral aggregate to manufacture high-strength geopolymer concrete." Construction and Building Materials. 274, pp. 1-13. https://doi.org/10.1016/j.conbuildmat.2020.121780
Article Title

A gentle acid-wash and pre-coating treatment of coral aggregate to manufacture high-strength geopolymer concrete

ERA Journal ID3470
Article CategoryArticle
AuthorsWang, Aiguo (Author), Lyu, Bangcheng (Author), Zhu, Yingcan (Author), Liu, Kaiwei (Author), Guo, Liping (Author) and Sun, Daosheng (Author)
Journal TitleConstruction and Building Materials
Journal Citation274, pp. 1-13
Article Number121780
Number of Pages13
Year2021
PublisherElsevier
Place of PublicationNetherlands
ISSN0950-0618
Digital Object Identifier (DOI)https://doi.org/10.1016/j.conbuildmat.2020.121780
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0950061820337843
Abstract

The coral reef fractures could be potentially used as aggregates for marine infrastructure construction, providing an alternative option to the high-cost gravel and sand aggregates. Coral aggregates are rough, porous and of low strength, which have a weak layer of minerals and microorganisms on the surface and a proportion of quartz inside pores. In the present study, using low concentration of acetic acid to pretreat coral aggregate was proposed to enhance the interface binding. When Portland cement was used as binder, the flexural and compressive strengths of cleaned coral aggregate concrete increased by 22.5% and 7.3%, respectively. Furthermore, the coral aggregate geopolymer concrete (CAGC) was prepared, given geopolymer acts as a strong binding and low porosity matrix, which is a promising material for the marine environment. To manufacture high-strength CAGC, a combined treatment method by gentle acid-wash cleaning and pre-coating of coral aggregate was proposed. The results showed that the mass loss rate of coral aggregate increased with the increase of acetic acid concentration and soaking time; the release of CO2 gas was helpful to remove the embedded sediment particles from the coral aggregates. Excessive acetic acid concentration and prolonged soaking time have adverse effects on the mechanical properties of CAGC, which was attributed to the corrosion of the internal skeleton of coral aggregate and the increase of connected pores. By using the gentle acid-wash and pre-coating method, a high-strength CAGC with compressive strength up to 60 MPa at 28-day was successfully manufactured, meeting the mechanical requirements of the most offshore construction requirements.

KeywordsCoral aggregate, Surface treatment, Acetic acid, Geopolymer, Pre-coating
ANZSRC Field of Research 2020400505. Construction materials
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Byline AffiliationsAnhui Jianzhu University, China
Centre for Sustainable Agricultural Systems
Southeast University, China
Institution of OriginUniversity of Southern Queensland
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