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Materials 2016, 9(2), 99; doi:10.3390/ma9020099

Investigation of Pozzolanic Reaction in Nanosilica-Cement Blended Pastes Based on Solid-State Kinetic Models and 29Si MAS NMR

1
New Transportation Research Center, Korea Railroad Research Institute (KRRI), Uiwang-si, Gyeonggi-do 16105, Korea
2
Department of Civil Engineering, University of New Mexico, Albuquerque, NM 87131, USA
3
Infra Structure Team, Technical Division, GS E&C, Seoul 110-130, Korea
4
Department of Civil Engineering, Kyunganm University, Changwon-si 631-701, Korea
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 5 October 2015 / Accepted: 21 January 2016 / Published: 6 February 2016
(This article belongs to the Special Issue Utilisation of By-Product Materials in Concrete)
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Abstract

The incorporation of pozzolanic materials in concrete has many beneficial effects to enhance the mechanical properties of concrete. The calcium silicate hydrates in cement matrix of concrete increase by pozzolanic reaction of silicates and calcium hydroxide. The fine pozzolanic particles fill spaces between clinker grains, thereby resulting in a denser cement matrix and interfacial transition zone between cement matrix and aggregates; this lowers the permeability and increases the compressive strength of concrete. In this study, Ordinary Portland Cement (OPC) was mixed with 1% and 3% nanosilica by weight to produce cement pastes with water to binder ratio (w/b) of 0.45. The specimens were cured for 7 days. 29Si nuclear magnetic resonance (NMR) experiments are conducted and conversion fraction of nanosilica is extracted. The results are compared with a solid-state kinetic model. It seems that pozzolanic reaction of nanosilica depends on the concentration of calcium hydroxide. View Full-Text
Keywords: nanosilica; pozzolanic reaction; solid-state kinetic model; 29Si MAS NMR nanosilica; pozzolanic reaction; solid-state kinetic model; 29Si MAS NMR
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Moon, J.; Taha, M.M.R.; Youm, K.-S.; Kim, J.J. Investigation of Pozzolanic Reaction in Nanosilica-Cement Blended Pastes Based on Solid-State Kinetic Models and 29Si MAS NMR. Materials 2016, 9, 99.

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