Computers and Concrete

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Effect of elevated temperatures on properties and color intensities of fly ash mortar

  • Wang, Her-Yung (Department of Civil Engineering, National Kaohsiung University of Applied Sciences)
  • Received : 2006.09.11
  • Accepted : 2008.02.18
  • Published : 2008.04.25
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Abstract

This research examines the engineering properties and color intensities of mortar containing different amounts of fly ash (0, 5, 10 and 20%) mixed at different water-to-binder ratios (w/b = 0.23, 0.47 and 0.59) and exposed at different temperatures (T = 25, 100, 200, 400, 600 and $800^{\circ}C$). Results show that there is greater mass loss on ignition with high w/b and higher temperatures. In addition, the color channel image analyzer (Windows software written in Delphi) is utilized to study the relationship between the curing temperature and intensity of three primary colors, red, green and blue (RGB), of the fly ash mortar specimens. The results show that the RGB intensities on the specimen surface increases from that at $25^{\circ}C$. The mortar specimen becomes white with increase in w/b but without the addition of fly ash. Moreover, for mortar specimens with greater content of fly ash, red on the specimen surface has the greatest increase in intensity at elevated temperature. Observation the variations in color on the specimen surface may help estimate the highest elevated temperatures that concrete structures can withstand.

Keywords

Acknowledgement

Supported by : National Science Council of Taiwan

References

  1. Blodeau, A. and Malhotra, V.M. (2000), "High-volume fly ash system: concrete solution for sustainable development", ACI Mater. J., 97(1), 41-48.
  2. Bouzouba, N. and Fournier, B. (2003), "Optimization of fly ash content in Concrete Part I: Non-air-entrained concrete made without super plasticizer", Cement Concrete Res., 33, 1029-1037. https://doi.org/10.1016/S0008-8846(03)00004-8
  3. Helumth, R. A. (1987), Fly Ash in Cement and Concrete, PCA and D Laboratories, Illinois.
  4. Lin, D. F., Wang H. Y., and Luo H. L. (2004), "Assessment of fire-damaged mortar using digital image process," J. Mater. Civ. Eng., ASCE, 16(4), pp. 383-386. https://doi.org/10.1061/(ASCE)0899-1561(2004)16:4(383)
  5. Luo, H. L. Lin, D. F. and Wang, H. Y. (2003), "The study of detecting fire-related damages on sewage sludge mortar by image analysis", 1st IWA Conference on Scaling and Corrosion in Water and Wastewater Systems, Paper ref: SC26, Cranfield University.
  6. Paya, J. Monzo, J. Borrachero, M. V. Peris-Mora E. and Amahjour, F. (2003), "Mechanical treatment of fly ashes Part IV. Strength development of ground fly ash-cement mortars cured at different temperatures", Cement Concrete Res., 30, 543-551.
  7. Ramlochan, T. Zacarias P. Thomas, M. D. A. and Hooton, R. D. (2003), "The effect of pozzolans and slag on the expansion of mortars cured at elevated temperature Part I: Expansive behavior", Cement Concrete Res., 33, 806-814.
  8. Ravindrarajah, R. S., Lopez R. and Reslan H. (2002), "Effect of elevated temperature on the properties of highstrength concrete containing cement supplementary materials", The 9th International Conference on Durability of Building Materials and Components, 17-20th, Brisbane, Australia.
  9. Wang, H. Y. and Hwang, C. L. (1997), "Effect of elevated temperature on properties of fly ash paste", Chinese J. Mater. Sci., 29(3), 167-176.

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  1. Predicting the high temperature effect on mortar compressive strength by neural network vol.8, pp.5, 2011, https://doi.org/10.12989/cac.2011.8.5.491
  2. Quality assessment of high performance concrete using digitized image elements vol.10, pp.4, 2012, https://doi.org/10.12989/cac.2012.10.4.409