Paper Title:
Variation of Carbonation Coefficient of Pumping Concrete with Moist-Curing Time at early Ages and Fly-Ash Content
  Abstract

Based on accelerated carbonation test, the variation of carbonation resistance of pumping concrete (C40 grade) with moist-curing time at early ages and fly-ash content was studied. Results indicate that the carbonation coefficient and the accelerated carbonation depth of the concrete increased obviously with a reduction in the moist-curing time at early ages and with an increase in the fly-ash content. For example, in conditions of curing schedules with 28, 7, 3, 2 and 1 d moist-curing at 20 0C with above 95% RH at early ages and then 0, 21, 25, 26 and 27 d air curing at 20 0C with 60% RH, respectively, carbonation coefficients of the concrete incorporated with 30% fly-ash were 2.04, 2.49, 3.16, 3.86 and 5.42 mm/a0.5 respectively, and thus it can be seen that the calculated times when concrete cover (25 mm) was completely carbonated naturally in now atmosphere (0.04% CO2) were 164, 104, 66, 44 and 21 years respectively. The results suggest that for the carbonation resistance of the C40 concrete incorporated with up to 30% fly-ash, the moist-curing time of 7 days at early ages should be necessary.

  Info
Periodical
Advanced Materials Research (Volumes 287-290)
Chapter
Building Materials
Edited by
Jinglong Bu, Pengcheng Wang, Liqun Ai, Xiaoming Sang, Yungang Li
Pages
899-905
DOI
10.4028/www.scientific.net/AMR.287-290.899
Citation
Q. Ye, Z. W. Song, G. R. Yu, "Variation of Carbonation Coefficient of Pumping Concrete with Moist-Curing Time at early Ages and Fly-Ash Content", Advanced Materials Research, Vols. 287-290, pp. 899-905, 2011
Online since
July 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hui Xu, Zhan Qing Chen, Su Bei Li, Wei Huang, Dan Ma
Abstract:Making full use of fly ash (FA) is an important part of sustainable materials development in the word. This paper discussed the carbonation...
327
Authors: Zhi Min He, Jun Zhe Liu, Tian Hong Wang
Abstract:In precast concrete elements manufacturing, steam-cured concrete incorprating 30% mineral admixtures encountered the problem of too low...
1535
Authors: En Li Lu, Guo Li, Ying Shu Yuan, Ou Geng, Jian Min Du
Abstract:Studies about the resistance of carbonation capability of fly-ash (FA) concrete at different initial curing regimes and exposure time through...
920
Authors: Jian Hua Wu, Yun Lan Liu
Abstract:This paper studies the influence of different mineral admixtures(fly ash and ground granulated blast furnace slag)on the carbonation...
366
Authors: Xue Song Zhang
Chapter 7: Building Materials
Abstract:Based on the mechanism of concrete carbonation, the effects of content of fly ash in the binder, the water to binder ratios, compound...
1688