Browse > Article
http://dx.doi.org/10.5389/KSAE.2005.47.5.027

Facilitation of the Diverse Processing of High Ductile ECC (Engineered Cementitious Composite) Based on Micromechanics and Rheological Control  

Kim, Yun-Yong (한국과학기술원 건설 및 환경공학과)
Kim, Jeong-Su (한국과학기술원 건설 및 환경공학과)
Publication Information
Journal of The Korean Society of Agricultural Engineers / v.47, no.5, 2005 , pp. 27-39 More about this Journal
Abstract
In the recent design of high ductile fiber-reinforced ECC (engineered cementitious composite), optimizing both processing and mechanical properties for specific applications is critical. This study presents an innovative method to develop new class ECCs, which possess the different fluid properties to facilitate diverse types of processing (i.e., self-consolidating or shotcrete processing) while maintaining ductile hardened properties. In the material design concept, we employ a parallel control of fresh and hardened properties by using micromechanics and cement rheology. Control of colloidal interaction between the particles is regarded as a key factor to allow the performance of the specific processing. To determine how to control the particle interactions and the viscosity of cement suspension, we first introduce two chemical admixtures including a highly charged polyelectrolyte and a non-ionic polymer. Optimized mixing steps and dosages we, then, obtained within the solid concentration predetermined based on micromechanical principle. Test results indicate that the rheological properties altered by this approach were revealed to be highly effective in obtaining the desired function of the fresh ECC, allowing us to readily achieve hardened properties, represented by pseudo strain-hardening behavior in uniaxial tension.
Keywords
ECC; Cement Paste; Rheology; Self-consolidating; Shotcrete Processing; Tensile strain-hardening;
Citations & Related Records
연도 인용수 순위
  • Reference
1 ACI, 1990, Guide to Shotcrete (ACI -506R-90), American Concrete Institute, p.41
2 Kanda, T., and Li, V.C., 1999, A New Micromechanics Design Theory for Pseudo Strain Hardening Cementitious Composite, ASCE J. of Engineering Mechanics, vol.125, No.4, pp.373-381   DOI   ScienceOn
3 Kong, H.J., et aI., 2003, Development of a Self-Consolidating Engineered Cementitious Composite Employing Electrosteric Dispersion/ Stabilization, J. Cement and Concrete Composites, vol.25, No.3, pp.301-309   DOI   ScienceOn
4 Weimann, M. B., and Li. V.C., 2003, Hygral Behavior of Engineered Cementitious Composites (ECC), International Journal for Restoration of Buildings and Monuments, Vol. 9, No 5, pp.513-534
5 Wu, C., 2000, Micromechanical Tailoring of PVA-ECC for Structural Applications, Ph. D. Thesis, Ann Arbor, University of Michigan, p.238
6 Li, V.C., et al., 1991, A Micromechanical Model of Tension-softening and Bridging Toughness of Short Random Fiber Reinforced Brittle Matrix Composites, J. Mech. Phys. Solid, vol.39, No.5, pp.607-625   DOI   ScienceOn
7 Li. V.C., et al., 2001, Tensile Strainhardening Behavior of PV A - ECC, ACI Materials Journal, vol.98, No.6, pp.483-492
8 EFNARC, 1999, European Specification for Sprayed Concrete: Guidelines for Specifiers and Contractors, Hapshire, UK, p.31
9 Yoshioka, K., et al., 1997, Role of steric hindrance in the performance of superplasticizers for concrete, J. Am. Ceram. Soc., vol.80, pp,2667-2671   DOI   ScienceOn
10 Lewis, J.A., et al., 2000, Polyelectrolyte effects on the rheological properties of concentrated cement suspensions, J. Am. Ceram. Soc., vol.83, pp.1905-1913   DOI   ScienceOn
11 Lin, Z., et al., 1999, On Interface Property Characterization and Performance of Fiber Reinforced Cementitious Composites, J. Concrete Science and Engineering, RILEM, Vol.1, pp.173-184
12 Kim, Y.Y., et aI., 2003, Design of Engineered Cementitious Composite Suitable for Wet-mixture Shotcreting, ACI Materials Journal, Vol.100, No.6, pp.511-518
13 Marshall, D. B., and Cox, B. N., 1988, A J-integral Method for Calculating Steadystate Matrix Cracking Stresses in Composites, Mechanics of Materials, No.8, pp.127-133