Effects of Nano-CaCO₃ on the Compressive Strength and Microstructure of High Strength Concrete in Different Curing Temperature

Abstract:

In this paper, effects of nano-CaCO3 on compressive strength and Microstructure of high strength concrete in standard curing temperature(21±1°C) and low curing temperature(6.5±1°C) was studied. In order to improve the early strength of the concrete in low temperature, the early strength agent calcium nitrite was added into. Test results indicated that 0.5% dosage of nano-CaCO3 could inhibit the effect of calcium nitrite as early strength agent, but 1% and 2% dosage of nano-CaCO3 could improve the strength of the concrete by 13% and 18% in standard curing temperature and by 17% and 14% in low curing temperature at the age of 3days. According to the XRD spectrum, with the dosage up to 1% to 2%, nano-CaCO3 can change the orientation index significantly, leading to the improvement of strength of concrete both in standard curing temperature and low curing temperature.

• Periodical: Applied Mechanics and Materials (Volumes 121-126)
• Pages: 126-131
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.121-126.126
• Online since: October 2011
• Authors: Qing Lei Xu, Tao Meng, Miao Zhou Huang
• Keywords: Compressive Strength, Concrete, Low Temperature Curing, Nano-CaCO₃, XRD Spectrum

References

[1] Cunqian Ma, Qianping Ran, Yonglin Mao, Jianfang Sha, Jiaping Liu: Effect of Ultra-early strength type polycarboxylate superplasticizer on early strength development of concrete. China Concrete And Cement Products: Number 5 in 2009(Total No. 169), p.4.

[2] Yunli Zhang, Shien Zhang, Ying Zhang, Baozhi Bian: Admixture Technology of Winter Concrete Construction in Yangtze River region. Concrete: Number 9 in 2002(Total No. 155), p.45~48(in Chinese).

[3] Charles K. Nmai: Cold Weather Concreting Admixtures. Cement and Concrete Composites: 20(1998), p.121~128.

DOI: 10.1016/s0958-9465(97)00063-2

[4] Tao Meng, Kuangliang Qian, Xiaoqian Qian, Shulin Zhan: Effect of the Nano-CaCO3 on Hydrated Properties and Interface of Cement Paste. Rare metal materials and engineering: Vol. 37, Suppl. 2(May, 2008), p.667~669(in Chinese).

[5] Guhua Li, Bo Gao: Effect of Level SiO2 and Level CaCO3 on Concrete Performance. Journal of the China railway society: Vol. 28 No. 1(February 2006), p.131~135(in Chinese).

[6] Azimah Hussin, Colin Poole: Petrography evidence of the interfacial transition zone (ITZ) in the normal strength concrete containing granitic and limestone aggregates. Construction and Building Materials: No. 25 (2011), p.2298~2303.

DOI: 10.1016/j.conbuildmat.2010.11.023