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Materials 2017, 10(3), 225; doi:10.3390/ma10030225

Acceleration of Intended Pozzolanic Reaction under Initial Thermal Treatment for Developing Cementless Fly Ash Based Mortar

1
Department of Architecture & Architectural Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
2
Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore 117576, Singapore
*
Authors to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 13 January 2017 / Revised: 17 February 2017 / Accepted: 21 February 2017 / Published: 24 February 2017
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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. View Full-Text
Keywords: cementless mortar; pozzolanic reaction; thermal treatment; fly ash; silica fume cementless mortar; pozzolanic reaction; thermal treatment; fly ash; silica fume
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MDPI and ACS Style

Kwon, Y.-H.; Kang, S.-H.; Hong, S.-G.; Moon, J. Acceleration of Intended Pozzolanic Reaction under Initial Thermal Treatment for Developing Cementless Fly Ash Based Mortar. Materials 2017, 10, 225.

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