Experiment research on mix design and early mechanical performance of alkali-activated slag using response surface methodology (RSM) |
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| Affiliation: | 1. Department of Airfield and Building Engineering, Air Force Engineering University Engineering College, Xi’an 710038, China;2. State Key Laboratory of Explosion Disaster Prevention and Reduction, PLA University of Science and Technology, Nanjing 210007, China;1. University of South Carolina, Dept. of Civil and Environ. Engineering, 300 Main Street, B122A, Columbia, SC 29208, USA;2. Purdue University, School of Civil Engineering, 550 Stadium Mall Drive, HAMP G175, West Lafayette, IN 47907, USA;3. Holcim (US) Inc., 9624 Bailey Road/Suite 275, Cornelius, NC 28031, USA;4. 100 Maple Shade Ln, Lexington, SC 29037, USA;5. University of South Carolina, Dept. of Civil and Environ. Engineering, 300 Main Street, C206, Columbia, SC 29208, USA;1. Department of Civil Engineering, Harran University, Şanlıurfa, Turkey;2. Department of Civil Engineering, Hasan Kalyoncu University, Gaziantep, Turkey;3. Department of Civil Engineering, Diyala University, Diyala, Iraq;1. Department of Civil and Environmental Engineering, Clarkson University, 8 Clarkson Avenue, Box 5712, Potsdam, NY 13699, USA;2. Department of Civil and Environmental Engineering, Clarkson University, 8 Clarkson Avenue, Box 5710, Potsdam, NY 13699, USA;1. School of Metallurgy and Materials Engineering, University of Tehran, Tehran, Iran;2. Department of Ceramic, Shahreza Branch, Islamic Azad University, Isfahan, Iran;3. MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington, New Zealand |
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| Abstract: | To enhance the quality of alkali-activated slag (AAS) materials, scientific and efficient mix design method is preferred. This paper presents an optimization of AAS materials using Response Surface Methodology (RSM). Three factors related to early strength such as modulus (n), concentration of alkali activator (CAA) and liquid–solid ratio (LSR) were investigated. Specimens with different mix ratios were prepared based on RSM design. The early mechanical performance was assessed, after 2 or 3 h of curing. Then response surface models were established and the effect law of each factor was systemically analyzed. The result shows that both n and CAA have a significant effect on the early strength, while LSR affects slightly. By adjusting the mix design parameters, the early performance of AAS can be effectively improved. This study verifies that RSM is efficient in the preparation of AAS and it can control the early strength of AAS accurately. |
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| Keywords: | Alkali-activated slag (AAS) Response surface methodology (RSM) Mix design Early strength |
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