Effect of fly ash fineness on compressive strength and pore size of blended cement paste |
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| Affiliation: | 1. Department of Civil Engineering, Khon Kaen University, Khon Kaen 40002, Thailand;2. Department of Civil Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand;1. School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China;2. Building Waterproof Engineering and Technology Research Center of Hubei Province, Hubei University of Technology, Wuhan 430068, China;3. State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan 430070, China;4. China Construction Third Bureau Green Industry Investment Co., Ltd, Wuhan 430100, China;1. Department of Civil and Environmental Engineering, Yamaguchi University, Tokiwadai 2-16-1, Ube, Yamaguchi 755-8611, Japan;2. School of Civil Engineering and Surveying, University of Portsmouth, Portsmouth PO1 3AH, United Kingdom;3. The Chugoku Electric Power Co. Inc., Komachi 4-33, Naka-ku, Hiroshima, Japan;1. Department of Environmental Systems Engineering, Sejong Campus, Korea University, Sejong-si, 30019, Republic of Korea;2. Department of Civil and Environmental Engineering, Gachon University, Seongnam, 13120, South Korea |
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| Abstract: | This paper presents an experimental investigation on the effect of fly ash fineness on compressive strength, porosity, and pore size distribution of hardened cement pastes. Class F fly ash with two fineness, an original fly ash and a classified fly ash, with median particle size of 19.1 and 6.4 μm respectively were used to partially replace portland cement at 0%, 20%, and 40% by weight. The water to binder ratio (w/b) of 0.35 was used for all the blended cement paste mixes.Test results indicated that the blended cement paste with classified fly ash produced paste with higher compressive strength than that with original fly ash. The porosity and pore size of blended cement paste was significantly affected by the replacement of fly ash and its fineness. The replacement of portland cement by original fly ash increased the porosity but decreased the average pore size of the paste. The measured gel porosity (5.7–10 nm) increased with an increase in the fly ash content. The incorporation of classified fly ash decreased the porosity and average pore size of the paste as compared to that with ordinary fly ash. The total porosity and capillary pores decreased while the gel pore increased as a result of the addition of finer fly ash at all replacement levels. |
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