Influence of Early Age Wet Curing Time, Clinker and CaO Content on the Carbonation Resistance of C40 Ordinary Concrete

Abstract:

Based on accelerated carbonation test, the variation of the carbonation resistance of ordinary concrete (C40 grade) with early age wet curing time, clinker and CaO content was studied. Results indicate that the carbonation coefficient and the accelerated carbonation depth of the concrete increased obviously with a reduction in the wet curing time at early ages, the clinker or CaO content in binder and the compressive strength at 28 d age. For example, in conditions of curing schedules with 28, 7, 3, 2 and 1 d wet curing at 20 °C with above 95% RH at early ages and then 0, 21, 25, 26 and 27 d air curing at 20 °C with 60% RH, respectively, carbonation coefficients of the concrete incorporated with 15% fly-ash and 25% slag were 1.83, 2.71, 3.61, 4.67 and 5.50 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 191, 104, 52, 31 and 20 years respectively. It is possible to predict the potential carbonation coefficient of the concrete from its clinker or CaO content in binder and from its compressive strength at 28 d age in conditions of the certain wet curing time at early ages.

• Periodical: Advanced Materials Research (Volumes 311-313)
• Pages: 1894-1900
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.311-313.1894
• Online since: August 2011
• Authors: Qing Ye
• Keywords: Accelerated Carbonation, CaO, Carbonation Resistance, Clinker, Ordinary Concrete, Wet Curing

References

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

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

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

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

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

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

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

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

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

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

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

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

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

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