Influence of Shrinkage Compensation in Cement Matrix on the Tension Stiffening of Reinforced Strain-Hardening Cement Composite (SHCC) Tension Ties

Abstract:

This paper investigates the interaction of structural deformed bar reinforcement and strain hardening cement composite (SHCC). The SHCC shows excellent mechanical properties such as multiple cracks and strain-hardening. Generally, SHCC material consists of cement, silica sand and fibers and is rich mixture without aggregate. Rich mixture leads to much shrinkage strain of SHCC material. In this research, the replacement of a part of cement by expansive admixture (EXA) is considered as an alternative to compensate the shrinkage strain of SHCC material. This paper presents the experimental results of tests on tension stiffening and cracking behavior of reinforced conventional and shrinkage-compensating SHCC ties in monotonic and cyclic tension. Each tie specimen had a square cross-section dimension of 100 x 100mm and length of 1,500mm. A 16mm diameter deformed bar was embedded centrally and mixed with 1.5% hybrid fibers composed of Polyethylene(PE) and Steel core(SC). The test results indicated that the shrinkage compensation of cement matrix in SHCC improve the tension stiffening and cracking behavior of reinforced SHCC ties in monotonic and cyclic tension loading.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 3660-3663
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.3660
• Online since: October 2012
• Authors: Hyun Do Yun*, Su Chang Wang, Chang Gun Cho
• Keywords: Expansive Admixture, Hybrid Fiber, Shrinkage Compensation, Strain-Hardening Cement Composite, Tension Stiffening

References

[1] Yun, Hyun-Do et al. :  Architectural Institute of Korea, Vol. 22, No12, (2006) p.79~86

[2] Lee, Young-Oh et al. :  Journal of The Korea Concrete Institute, Vol.22n No. 5, (2010) p.617~624

[3] Gregor Fischer and Vicror C. Li : ACI structural journal, Vol. 99, No.1 (2002), p.104

[4] Homayoun H. Abrishami and Denis Mitchell : ACI structural journal, Vol. 94, No.6 (1997), p.769