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Performance and internal curing of recycled autoclaved aerated lightweight aggregate concrete

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Document pages: 11 pages

Abstract: Global warming is an important problem faced by every sector in the world, including the construction industry. In order to realize the concept of green technology, many attempts have been made to develop low-carbon footprint products. In the construction industry, autoclaved aerated concrete (AAC) has become more and more popular and has been produced to meet the construction demand. However, errors in the manufacturing process account for about 3 to 5 of AAC production. Using AAC waste as lightweight aggregate in concrete is one of the potential ways for in-depth study in this paper. The results show that the compressive strength of aac-lwa concrete decreases with the increase of volume and coarse particle size. The best mix proportion is AAC aggregate size of asphalt mixture 2′′ to 3 8′′ with 20 to 40 replacement to normal weight aggregate. Internal curing by AAC-LWA was also observed and found to provide sufficient water inside the specimens, leading to an achievement in higher compressive strength. The main goal of this study is not only utilising unwanted wastes from industry (recycling of waste materials) but also building up a new knowledge of using AAC-LWA as an internal curing agent as well as the production of value-added lightweight concrete products.

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