JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Premature Stiffening of Cement Paste Caused by Secondary Gypsum and Syngenite Formation (False Set)
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
  • Journal title : Architectural research
  • Volume 13, Issue 1,  2011, pp.25-32
  • Publisher : Architectural Institute of Korea
  • DOI : 10.5659/AIKAR.2011.13.1.25
 Title & Authors
Premature Stiffening of Cement Paste Caused by Secondary Gypsum and Syngenite Formation (False Set)
Chung, Chul-Woo; Lee, Jae-Yong;
  PDF(new window)
 Abstract
The purpose of this research is to investigate the effect of specific hydration reaction on the stiffening process of cement paste. The cement compositions are manipulated to cause specific hydration reactions (secondary gypsum and syngenite formation) responsible for false set, and the relationship between specific hydration reactions and the flow and stiffening behavior of cement paste were investigated using modified ASTM C 403 penetration resistance measurement and oscillatory shear rheology. X-ray powder diffraction (XRD) was used for the phase identification associated with premature stiffening of cement paste. Differential thermal analysis (DTA) and thermogravimetric analysis (TGA) were used for verification of syngenite formation. From the results, both secondary gypsum and syngenite formation caused faster stiffening and set. The amount of syngenite produced during 1 hour hydration was approximately 1 % of total mass of the cement paste, but cement paste with syngenite formation showed significantly accelerated stiffening behavior compared to normal cement paste.
 Keywords
Penetration Resistance;Syngenite Formation;Secondary Gypsum Formation;False Set;Cement Paste;
 Language
English
 Cited by
 References
1.
Aitcin, P. C. (1998), High Performance Concrete, E & FN SPON,

2.
ASTM Test Method for Time of Setting of Hydraulic Cement by Vicat Needle (C 191), Annual Book of ASTM Standards, Vol. 04. 01, ASTM International, West Conshohocken, PA, 2003.

3.
ASTM Test Method for Time of Setting of Concrete Mixtures by Penetration Resistance (C 403), Annual Book of ASTM Standards, Vol. 04. 02, ASTM International, West Conshohocken, PA, 2003.

4.
Channell, G. M., and Zukoski, C. F. (1997), "Shear and Compressive Rheology of Aggregate Alumina Suspensions, AICHE Journal, Vol. 43: 1700-1708. crossref(new window)

5.
Channell, G. M., Miller, K. T., and Zukoski, C. F. (2000), "Effect of Microstructure on the Compressive Yield Stress, AICHE Journal, Vol. 46: 72-78. crossref(new window)

6.
Chen, L. B. (1991), "The Dynamic Properties of Concentrated Charge Stabilized Suspensions". Ph.D dissertation, University of Illinois at Urbana-Champaign, Urbana (IL).

7.
Chung, C. -W., Mroczek, M., Park, I. -Y., and Struble, L. J. (2010), "On the evaluation of setting time of cement paste based on ASTM C 403 penetration resistance test", Journal of Testing and Evaluation, Vol. 38: 527-533.

8.
Lei W. G., and Struble. L. J. (1997), "Microstructure and Flow behavior of Fresh Cement Paste," Journal of American Ceramic Society, Vol. 80: 2021-2028.

9.
Mindess, S., Young, J. F., and Darwin, D. (2003), Concrete, 2nd edition, Prentice Hall.

10.
Struble, L. J., and Sun, G. - K. (1995), Viscosity of Portland Cement Paste as a Function of Concentration, Advanced Cement Based Materials, Vol. 2: 62-69. crossref(new window)

11.
Struble, L. J., Kim, T.-Y., and Zhang, H., Setting of Cement and Concrete. Journal of Cement, Concrete, and Aggregate, 2001, Vol. 23:

12.
Suzuki, K., Nichikawa, T., Kato, K., Hayashi, H., and Ito, S. (1981) "Approach by Zeta-Potential Measurement on the Surface Charges of Hydrating $C_3S$," Cement and Concrete Research, Vol. 11: 759-764. crossref(new window)

13.
Taylor, H. F. W. (1997), Cement Chemistry, 2nd edition, Academic Press, Thomas Telford edition,

14.
Zhang, H. (2001), "Using Dynamic Rheology to Explore the Microstructure and Stiffening of Cementitious Mixtures, Ph.D dissertation, University of Illinois at Urbana Champaign, Urbana (IL).