Analysis of Stress - Strain Curve on Recycled Aggregate Concrete under Uniaxial and Conventional Triaxial Compression

Abstract:

43 Φ50mm × 100mm column stress - strain curve tests are completed through RMT-201, which studied the compressive stress - strain curves of recycled aggregate concretes at distinct confining pressures under conventional triaxial stress state. This article, has analyzed the influence of different water-cement ratios, confining pressures on the curves, and raised constitutive equations of triaxial compression stress - strain curves for the different strength of recycled aggregate concretes.The brittleness indexes for recycled aggregate concrete under distinct confining pressures were analyzed contrastively. The result showed that: the failure modes of recycled aggregate concrete specimens are similar to those of ordinary concretes, but the final failure patterns of recycled aggregate and ordinary aggregate are quite different; with the increase of lateral pressure, the peak stress and peak strain of recycled aggregate concrete show linear growth; recycled aggregate concrete compressive stress - strain curves under the uniaxial and triaxial stress states are similar to ordinary aggregate concrete, yet peak strain shows signs of larger growth; with the increase of lateral pressure, the brittleness of recycled aggregate concrete reduces. The brittleness index of high-strength recycled aggregate concrete is larger wholly than that of ordinary recycled aggregate concrete and with confining pressure reaching a certain value, the brittleness index remains stable.

• Periodical: Advanced Materials Research (Volumes 168-170)
• Pages: 900-905
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.168-170.900
• Online since: December 2010
• Authors: Hai Feng Yang, Zhi Heng Deng, Ying Huang
• Keywords: Brittleness Index, Conventional Triaxial, Recycled Aggregate Concrete (RAC), Stress-Strain Curve

References

[1] Topcu IB, Güncan NF: Cement and Conere Research. Vol. 25 (1995),P. 1385.

[2] Yidong Xu, Daoyao Wu: Building Technology(in Chinese). Vol. 40 (2009),P. 17.

[3] Jianzhuang Xiao, Jiabin Li, Ch. Zhang: Cement and Concrete Research. Vol. 35 (2005),P. 1187.

[4] Zhenhai Guo: The concrete strength and deformation test and constitutive relation(in Chinese). (Tsinghua University Press, China1997).

[5] V. Bhikshma, R. Kishore: Asian Journal of Civil Engineering. Vol 11 (2010),P. 253.

[6] Chujie Jiao, Wei Sun, Honggen Qin: Journal of Southeast University (in Chinese). Vol 34 (2004),P. 366.

[7] Ting Du: Microstructure of High Performance Recycled Concrete and Test Analysis. (in Chinese) (Wuhan: Huazhong University of Science, China 2006).