Title: Contribution to thermal study of modified cement pastes based on siliceous SCMs

Authors: Karima Arroudj; Mohamed Nadjib Oudjit; Arezki Tagnit-Hamou

Addresses: Building in Environment Laboratory, Faculty of Civil Engineering, University of Sciences and Technology Houari Boumediene, P.O. Box 32, El Alia- Bab Ezzouar, Algiers, Algeria ' Building in Environment Laboratory, Faculty of Civil Engineering, University of Sciences and Technology Houari Boumediene, P.O. Box 32, El Alia- Bab Ezzouar, Algiers, Algeria ' Cementitious Materials Laboratory, Faculty of Engineering, Department of Civil Engineering, 2500 Boul. Université, Sherbrooke (Québec) J1K 2R1, Canada

Abstract: This study aims to highlight siliceous additive available in Algeria: ground blast furnace slag 'S' and dune sand or Quartz 'Q' compared to silica fume 'SF'. Monitoring the hydration of cement pastes modified by replacing 15% additive by thermal analysis (Differential thermal and thermo gravimetric analysis -DTA/TG) quantifies the Portlandite consumed by the additive, the combined water 'Wn' and the degree of hydration as function of time. The results of this study confirm and complement those found in previous research: compared to SF and S, quartz has a low pozzolanic activity resulted in consumption of Portlandite released during cement hydration. This study is completed by mechanical tests on ultra high performance concrete (UHPC), with a same level of replacement. A new generation of sustainable and eco-concrete is obtained based on local materials.

Keywords: pozzolanic activity; portlandite; hydration degrees; DTA/TG.

DOI: 10.1504/IJMMP.2019.099227

International Journal of Microstructure and Materials Properties, 2019 Vol.14 No.2, pp.170 - 183

Received: 22 Aug 2017
Accepted: 27 Jul 2018

Published online: 23 Apr 2019 *

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