Discussion on Measuring Methods of Deformation of Concrete at early Ages

Abstract:

The deformation law of concrete at early age not only affects the shrinkage and cracking of concrete structure in construction, but also further influences its mechanical performance, safety and durability. Based on the existing test methods of cementitious material deformation at early age and aimed at the existing problems, this paper puts forward five kinds of technical solutions to improve the measurement method. Try to use the change in light signals, the electrical signals and leverage-buoyancy method to implement the automatic and continuous deformation monitoring of early-age concrete. Lastly the combination of corrugated pipe, tilt flat base and eddy-current transducer was recommended as the optimal non-contact measurement method for monitoring the deformation of early-age concrete.

• Periodical: Applied Mechanics and Materials (Volumes 584-586)
• Pages: 1985-1991
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.584-586.1985
• Online since: July 2014
• Authors: Qi Liu*, Ying Zi Yang, Hong Wei Deng
• Keywords: Concrete, Deformation at early Age, Measuring Method

References

[1] Hengjing Ba, Xiaojian Gao and Yingzi Yang: Research on shrinkage cracking of concrete and its prevention, Quality of Engineering (2002), pp.197-199 (In Chinese).

[2] Standard for test methods of long-term performance and durability of ordinary concrete, (GB/T50082-2009). (In Chinese).

[3] Tazawa: Autogenous shrinkage of concrete (Taylor & Francis Books Ltd, London 1999), pp.1-67.

[4] Bentur A. Terminologys and definitions. International RILEM Conference on Early Age Cracking in Cementitious System—EAC`01. Haifa: RILEMTC (2001), pp.13-15.

DOI: 10.1617/13764

[5] Qian Tian, Wei Sun, Changwen Miao and Yaping Liu: Study on the Measurement of Autogenous Shrinkage of High Performance Concrete, volume 8 of Journal of Building materials (2005), chapter 1, pp.82-89 (In Chinese).

[6] Yu Zhu, Hongwei Deng and Jingsheng Zeng: Research Progress of Measuring Methods for Autogenous Shrinkage of Concrete, volume 10 of Low Temperature Architecture technology (2010), pp.7-9.

[7] Erika E. Holt, in: Early age autogenous shrinkage of concrete, PhD thesis.

[8] Qian Tian and Jensen Ole Mejlhede: Measurement with Corrugated Tubes of Early Age Autogenous Shrinkage Cement-Based Materials, volume 37 of The Journal of Chinese Ceramic Society (2009), NO. l, pp.39-45.