Experimental Study on Thermal Expansion Properties and Micro-Pore Texture of High Strength Concrete in Early Age

Abstract:

The early age cracking of concrete is concerned with its thermal expansion properties, which is mainly reflected by the thermal expansion coefficient. Reasonably controlling the coefficient is an effective way of reducing cracks in the early age of concrete. While thermal expansion properties are related to the micro-pore texture characteristics of the concrete. Micro-pore textures of concretes of different mixing ratios and curing time were measured via mercury intrusion porosimetry (MIP), and the thermal expansion coefficient was determined by the comparator. The analysis of test results indicates the correlation between the parameters of micro-pore texture and thermal expansion properties, and also shows a highly positive correlation between the pore area and the thermal expansion coefficient. The results provide a solution for reducing the thermal expansion coefficient, thus controlling the early age cracking.

• Periodical: Advanced Materials Research (Volumes 250-253)
• Pages: 497-501
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.250-253.497
• Online since: May 2011
• Authors: Ai Kai Wang, Ya Dong Xue, Rui Wang, Suo Xiang Lv, Xiao Kang She, Bo Li, Heng Jiao Tian
• Keywords: Early Age Cracking, High-Strength Concrete (HSC), Micro-Pore Texture, Thermal Expansion Coefficient

References

[1] Gerwick Jr, Ben C: High-performance concrete. Present and future. Aberdeen's Concrete Construction, Vol. 37(1992), p.355~357

[2] Cho, Young S: Non-destructive testing of high strength concrete using spectral analysis of surface waves. NDT and E International,Vol. 36(2003), p.229~235

DOI: 10.1016/s0963-8695(02)00067-1

[3] Guo Chengju: Physics and chemistry of concrete. (China Rail Press, Beijing 2004) (In Chinese)

[4] Grasley Z C, Lange D A:Thermal dilation and internal relative humidity of hardened cement paste. Materials and structures,Vol. 40(2007), p.311~317

DOI: 10.1617/s11527-006-9108-x

[5] Yao Wu, Zheng Xin: Effect of mix proportion on coefficient of thermal expansion of concrete.Journal of Tongji university (Natural science), Vol. 35(2007), p.77~81,87(In Chinese)

[6] Rakesh Kumar,B. Bhattacharjee: Porosity, pore size distribution and in situ strength of concrete. Cement and concrete research, Vol. 33(2003), p.155~164

DOI: 10.1016/s0008-8846(02)00942-0

[7] Rakesh Kumar,B. Bhattacharjee: Assessment of permeation quality of concrete through mercury intrusion porosimetry. Cement and concrete research, Vol. 34(2004), p.321~328

DOI: 10.1016/j.cemconres.2003.08.013

[8] Lian Huizhen,Tong Liang,Chen Enyi: The base of phases study on building materials. (Tsinghua University Press, Beijing 1996) (In Chinese)

[9] Rakesh Kumar, B. Bhattacharjee: Study on some factors affecting the results in the use of MIP method in concrete research. Cement and concrete research, Vol. 33(2003), p.417~424

DOI: 10.1016/s0008-8846(02)00974-2

[10] Zhao Qingxin: Effects of mineral admixtures on creep behavior of HPC.Southeast University,2007(In Chinese)

[11] Yuan Yong: Control of cracks in early-age concrete. (Science Press,Beijing 2004) (In Chinese)