Journal
JOURNAL OF CLEANER PRODUCTION
Volume 320, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2021.128894
Keywords
Autoclaved aerated concrete waste; Construction and demolition waste; Internal curing; Autogenous shrinkage
Categories
Funding
- National Natural Science Foundation of China [51902095]
- Natural Science Foundation of Hubei Province Innovation Group Project [2020CFA039]
- Hubei provincial Department of Education [D20201406]
- Key Research and Devel-opment Program of Hubei Province [2020BCA077]
- Scientific Research Foundation of Hubei University of Technology [GCRC2020012]
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AACW waste can be used as an internal curing agent in place of fine aggregate, offering better results in improving internal relative humidity, reducing autogenous shrinkage, delaying cracking time, refining pore structure, enhancing ITZ micro-hardness, and increasing resistance to chloride penetration compared to the traditional agent EPA.
Autoclaved aerated concrete waste (AACW) is an inorganic porous construction and demolition waste, which is possible to be environmentally used as an internal curing agent, due to its water absorption and release characteristics. In present work, fine aggregate (sand) was replaced by AACW aggregate with the same volume for internal curing purpose. The potential curing effect of AACW was also compared with a classical internal curing agent, i.e. expanded perlite (EPA), under the same particle size condition. Results indicate that the compressive strength of AACW groups after 28-day sealing curing is basically the same as that of the control group. Compared with EPA, internal curing with AACW can better improve the internal relative humidity, reduce the autogenous shrinkage, and delay the cracking time of cement mortar. At the same time, AACW effectively refines the pore structure and improves the micro-hardness of the interfacial transition zone (ITZ) through internal curing, and enhances the resistance to chloride penetration.
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