Effect of Thermal Environment at Early Age on Hydration Phases Composition and Strength Development of Concrete Containing Fly Ash

Abstract:

Cement hydration at early age is sometimes in a certain thermal environment probably caused by hydration heat of mass concrete as well as cement productions curing at high temperature. And phases composition and strength development in thermal environment are commonly different from those in normal curing conditions. Phases composition and strength development of concrete containing different fly ash content curing in different thermal environment are studied in this paper. Experimental results show that compressive strengths of concrete with 0.3 water to binder ratio increase with the increase of curing temperature. Splitting tensile strength of concrete not containing any fly ash curing at about 50 is the highest among those curing at temperature between 40 and 80 . For concrete with different fly ash content, splitting tensile strengths increase approximately with the increse of curing temperature. Dehydration of ettringite and formation of monosulfate solid solution and AFm at higher temperature perhaps relate to the development of concrete splitting tensile strength along with different curing temperature. Adding fly ash to binder, curing temperature at which hydration phases change occurs is raised, which helps to explain that splitting tensile strengths of concrete with different fly ash content decrease little with the increase of curing temperature between 60 and 80 .

• Periodical: Advanced Materials Research (Volumes 168-170)
• Pages: 582-588
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.168-170.582
• Online since: December 2010
• Authors: Feng Chen Zhang, De Jian Shen, Ji Kai Zhou, Zhong Hua Li
• Keywords: Fly Ash (FA), Hydration Phases Composition, Strength Developmet, Thermal Enviroment

References

[1] YUAN Guanglin, HUANG Fangyi,　SHEN Hua,　GAO Peng-fei: Concrete, 2 (2005), pp.86-89. (in Chinese).

[2] Kae-Long Lin, Chung-Yi Lin: Cement and Concrete Research, Vol. 35(2005), p.1999-(2007).

[3] R.I. Maleka, Z.H. Khalilb, S.S. Imbabyb, D.M. Roy: Cement and Concrete Research, Vol. 35(2005), pp.1152-1154.

[4] YUAN Runzhang: Cementitious Material Science. (Publishing Company of Wuhan Industrial University, Wuhan 1996) (in Chinese).

[5] H. H Patel, C. H Bland , A. B Poole: Cement and Concrete Research, Vol. 25(1995), pp.485-490.

[6] Lawrence C. D: CementConcrete Research, Vol. 25(1995), pp.903-914.

[7] LIU Bingjin. Durability Design of Concrete Structures (China Communications Press, Beijin 2007) (in Chinese).