The mechanical properties of fly ash concrete prepared and cured at high temperatures

Abstract

Results of an experimental investigation on the effect of fly ash content, water cement (w/c) ratio of concrete prepared and cured at temperatures of ambience, 40°C and 60°C are presented in this paper. The mechanical properties investigated here include its workability, its behaviour under compression and splitting tension. Microscopic investigations were also carried out using SEM micrographic images to gain understanding of concrete at its microstructural level.
The results indicate that high temperature increases early compressive strengths of concrete, but has decreasing effects on the strengths at later ages. The use of fly ash in concretes cast and cured at elevated temperatures improves the physical and mechanical properties of fresh as well as those of hardened concrete.
Various mathematical models describing the properties of such concretes are considered at the end of this paper. The strength properties of high temperature fly ash concrete were best represented by a simple exponential function of time, while its stress-strain relationship could be best described by an exponential function of strain of a more complicated form.
https://doi.org/10.29037/ajstd.313
PDF

References

Besari M.S., Munaf D.R., Hanafiah, Iqbal M.M. (1996), "Optimum Value of Fly Ash and Interface Density Behavior of High Performance Fly Ash Concrete'', International Symposium on Utilisation of High-Strength/High Performance Concrete, Paris-France.

Besari M.S., Munaf D.R., Hanafiah (1992), "The Effect of Fly Ash and Strength of Aggregate to The Mechanical Properties of High Strength Concrete", International Conference of Concrete and Structures, Singapore.

Iqbal M.M., Hanafiah, Iskandar (1996), "The Effect of High Temperature Environments on The Compressive Strength of Concrete" ITSF Report, Jakarta.

Kadir I.(1996), "The Effect of High Temperature Environments on The Mechanical Properties of Concrete'', M.S. Thesis, Institut Teknologi Bandung, Indones.

CUR (1991), "Fly Ash as Addition to Concrete", INTRON, Institute for Material and Environmental Research B.V.A.A. Balkema, Rotterdam.

Fip-Stupo, "Concrete in Hot Countries", The Dutch Member Group of FIP.

Fookes, D.J. Pollock, E.A. Kay (1987), "Concrete in the Middle East", A View Point Publication (12.077) part 2 from Magazine Concrete.

Soroaka I, (1993), "Concrete in Hot Environment", E & FN Spon, London.

Cuijuan, S., Luoshu, G. And Haimin, W., (1986), "Concrete Made with Calcium­ Enriched Fly Ash", Proceedings Second International Conference, Madrid, Spain, Volume 1, AC! SP-91, V.M. Malhotra Editor, pp. 387 - 411.

A.M. Neville (1991), "Properties of Concrete", ELBS Singapore.

Mandel, J. (1984), "The Statistical Analysis of Experimental Data", Dov

Downloads

Download data is not yet available.