Please wait.'

Page is loading'


Home  > Raw materials & technologies  > Applications  > Early age carbonation curing for precast r...

Wednesday, 17 July 2019
pdf
Raw materials & technologies, Applications

Early age carbonation curing for precast reinforced concretes

Thursday, 24 March 2016

Carbonation is considered detrimental to reinforced concrete. However if carbonation is performed at early age through curing, the process could be beneficial.

The process makes concrete a sandwich structure with carbonate-rich surface. Source: Peter Smola/pixelio.de

The process makes concrete a sandwich structure with carbonate-rich surface. Source: Peter Smola/pixelio.de

This paper is to present a study on a unique process that is developed for early age carbonation curing of precast reinforced concrete to maximise the performance improvement and the carbon storage capacity. The process includes vibration casting, in-mold curing, off-mold preconditioning, carbonation curing and subsequent hydration.

Process shows environmental and economical benefits

It was found that a carbon uptake of 16% based on the cement content could reduce concrete pH to 9.2 on the surface and maintain pH of 13.0 at core immediately after 12 h carbonation. The subsequent hydration was able to increase the pH on surface over 12.3 which was comparable to hydration reference. The carbonated concrete had shown more resistance to permeation by having a higher electrical resistivity on surface and was not more vulnerable to weathering carbonation. The off-mold preconditioning in open air caused no shrinkage cracking because of the controlled evaporation rate. The process makes concrete a sandwich structure with carbonate-rich surface which is responsible for strength gain, carbon storage and durability enhancement and is suitable for precast reinforced concrete production.

The study is published in: Construction and Building Materials, Volume 113, 15 June 2016, Pages 134–143

top of page
Comments (0)
Add Comment

Post comment

You are not logged in

register