A study on factors influencing compressive strength of CO2-cured concrete

Title: A study on factors influencing compressive strength of CO2-cured concrete
Author(s): C. Shi, M. Liu, Q. Zou and F He
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 703 - 711
Total Pages: 9
Nb references: 13
Language: English

Abstract: CO2 curing of concrete is an effective process to cure concrete products and utilize CO2. To improve the CO2 curing efficiency and strength of CO2-cured concrete blocks, factors influencing the compressive strength of CO2-cured concrete, such as specimen molding pressure, procuring relative humidity, pre-curing time, effective water to cement ratio, the degree of vacuum in curing chamber, CO2 pressure and concentration, were experimentally investigated. The results indicated that the strength of concrete specimens after CO2 curing correlated well with the CO2 curing degree. The suitable conditions, which could not only improve the curing efficiency, but also improved the strength of cured concrete products, include: molding pressure of 15 ~ 25MPa, pre-curing of three hours at relative humidity between 60-70%, effective water to cement ratio between 0.15 and 0.25, the degree of vacuum in curing chamber at -0.06 ~-0.09MPa, CO2 pressure and concentration at 0.20 ~ 0.40MPa and 60% respectively.

Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00