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Title: Acceleration of intended pozzolanic reaction under initial thermal treatment for developing cementless fly ash based mortar
Authors: Kwon, Y.-H
Kang, S.-H
Hong, S.-G
Moon, J 
Keywords: Addition reactions
Compressive strength
Fly ash
Heat treatment
Hydrated lime
Mechanical testing
Portland cement
Silica fume
X ray diffraction
Alkaline solutions
Compressive and flexural strengths
Industrial by-products
Material performance
Ordinary Portland cement
Pozzolanic reaction
Synergistic effect
Fume control
Issue Date: 2017
Publisher: MDPI AG
Citation: Kwon, Y.-H, Kang, S.-H, Hong, S.-G, Moon, J (2017). Acceleration of intended pozzolanic reaction under initial thermal treatment for developing cementless fly ash based mortar. Materials 10 (3) : 225. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Without using strong alkaline solution or ordinary Portland cement, a new structural binder consisting of fly ash and hydrated lime was hardened through an intensified pozzolanic reaction. The main experimental variables are the addition of silica fume and initial thermal treatment (60 °C for 3 days). A series of experiments consisting of mechanical testing (compressive and flexural strength, modulus of elasticity), X-ray diffraction, and measurements of the heat of hydration, pore structure, and shrinkage were conducted. These tests show that this new fly ash-based mortar has a compressive strength of 15 MPa at 91 days without any silica fume addition or initial thermal treatment. The strength increased to over 50 MPa based on the acceleration of the intensified pozzolanic reaction from the silica fume addition and initial thermal treatment. This is explained by a significant synergistic effect induced by the silica fume. It intensifies the pozzolanic reaction under thermal treatment and provides a space filling effect. This improved material performance can open a new pathway to utilize the industrial by-product of fly ash in cementless construction materials. © 2017 by the authors.
Source Title: Materials
ISSN: 1996-1944
DOI: 10.3390/ma10030225
Rights: Attribution 4.0 International
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