Influence of moisture content on CO2 uptake in lightweight concrete subject to early carbonation

Early-age carbonation curing of fresh concretes has shown its capacity to accelerate the production, recycle CO 2 , and to improve the concrete performance. The challenge facing this technology is the moisture content in fresh concrete which impedes CO 2 diffusion. This paper studies the effects of...

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Bibliographic Details
Published inJournal of sustainable cement based materials Vol. 2; no. 2; pp. 144 - 160
Main Authors Morshed, Abu Zakir, Shao, Yixin
Format Journal Article
LanguageEnglish
Published Routledge 01.06.2013
Subjects
early-age carbonation curing
lightweight concrete
strength gain
uptake
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Summary:Early-age carbonation curing of fresh concretes has shown its capacity to accelerate the production, recycle CO 2 , and to improve the concrete performance. The challenge facing this technology is the moisture content in fresh concrete which impedes CO 2 diffusion. This paper studies the effects of moisture content on carbonation reactivity of lightweight concretes (LWCs). The moisture content in LWC was adjusted by varying (1) the water to cement ratio, (2) the moisture carried in by lightweight aggregates, (3) the moisture removed by forced fan drying, and (4) the externally added water by surface spray as compensation of water loss. The performance of the carbonated concretes was evaluated by carbon uptake, strength gain, plastic shrinkage, and pH values. A process involving vibration compact forming, preconditioning, carbonation, water compensation, and subsequent hydration proved to be effective in achieving high degree of carbonation and hydration.
ISSN:2165-0373
2165-0381
DOI:10.1080/21650373.2013.797373