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/a^0.5 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.

• Periodical: Advanced Materials Research (Volumes 287-290)
• Pages: 899-905
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.287-290.899
• Online since: July 2011
• Authors: Qing Ye, Zhi Wei Song, Guo Rong Yu
• Keywords: Accelerated Carbonation, Carbonation Coefficient, Early Age, Fly Ash (FA), Moist-Curing, Pumping Concrete

References

[1] Feng Naiqian and Xing Feng: Durability of ordinary concrete and its structure. China Machine Press, Beijing, 2009, pp.100-101 (In Chinese)

[2] Zheng Jing: Journal of Shandong Environment Vol. 13(2003), May p.51 (in Chinese)

[3] Liu Junzhe: Concrete Vol. 27(2005), November pp.10-13 (in Chinese)

[4] H.F.W. Taylor: Cement Chemistry. U K Academic Press, London, 1990, pp.288-307

[5] Zhu Beirong, Yang Quanbing and Wu Xueli: China Concrete and Cement Products Vol. 29 (2002), February pp.3-6 (in Chinese)

[6] Qin Hong-gen, Pan Ganghua, Sun Wei and et al: China Concrete and Cement Products Vol.27 (2000), October pp.11-13 (In Chinese)

[7] Chen Xunjie, Zhang Yanchi and Ouyang Youling: China Concrete and Cement Products Vol.29 (2002), June pp.7-9 (In Chinese)

[8] Cengiz Duran Atis: Vol. 17 (2003), pp.147-152

[9] China National Standard GB/T50082-2009: China Architecture and Building Press, Beijing, 2009, pp.61-63 (In Chinese)

[10] Wang Bian and Gao Jianming: China Concrete and Cement Products Vol. 28 (2001), October pp.7-9 (In Chinese)

[11] Wang Peiming, Zhu Yanfang Ji Yiqi and et al: Journal of Building Materials Vol. 4 (2001), pp.305-310 (In Chinese)

[12] N. I. Fattuhi: Cem. Concr. Res. Vol. 18(1988), pp.426-430

[13] Lin Peng, Wu Xiaomei, Fan Yueming and et al: Industrial Construction Vol. 39 (2009), September pp.99-102 (In Chinese)

[14] Qiu Honglin and Ye Qing: Journal of Zhejiang University of Technology Vol. 36 (2008), pp.436-440 (In Chinese)

[15] Zhu Jingsong, Ye Qing and Zhang Tiangang: New Building Materials Vol. 35 (2008), May pp.4-7 (In Chinese)

[16] Ha-Won Song, Seung-Jun Kwon, Keun-Joo Byun and et al: Cem. Concr. Res. Vol. 36 (2006), pp.979-989

[17] Jin Zuquan, Sun Wei, Zhang Yunsheng and et al: Journal of Southeast University (Natural Science Edition) Vol. 35 (sup(I) 2005), pp.149-154 (In Chinese)

[18] C. S. Poon, Y. L. Wong and L. Lam: Construction and Building Materials Vol. 11 (1997), pp.383-393