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Materials 2016, 9(11), 933; doi:10.3390/ma9110933

Studying the Hydration of a Retarded Suspension of Ground Granulated Blast-Furnace Slag after Reactivation

Building Materials and Construction Chemistry, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355 Berlin, Germany
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Academic Editors: Luciano Feo and Claudio Ferone
Received: 30 August 2016 / Revised: 7 October 2016 / Accepted: 4 November 2016 / Published: 18 November 2016
(This article belongs to the Section Advanced Composites)
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Abstract

This article presents a combined use of a retarder (d-gluconic acid) and an alkaline activator (sodium hydroxide) in a binder system based on ground granulated blast-furnace slag. The properties of the retarder are extending the dormant hydration period and suppressing the generation of strength-giving phases. Different retarder concentrations between 0.25 and 1.00 wt.% regulate the intensity and the period of the retardation and also the characteristics of the strength development. The activator concentration of 30 and 50 wt.% regulates the overcoming of the dormant period and thereby the solution of the slag and hence the formation of the hydration products. The research objective is to produce a mineral binder system based on two separate liquid components. The highest concentration of retarder and activator generates the highest compressive strength and mass of hydration products—after 90 days of hydration a compressive strength of more than 50 N/mm2. The main phases are calcium silicate hydrate and hydrotalcite. Generally, the combination of retarder and activator shows a high potential in the performance increase of the hydration process. View Full-Text
Keywords: retardation; reactivation; ground granulated blast-furnace slag; d-gluconic acid; sodium hydroxide; hydration study retardation; reactivation; ground granulated blast-furnace slag; d-gluconic acid; sodium hydroxide; hydration study
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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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MDPI and ACS Style

Schneider, N.; Stephan, D. Studying the Hydration of a Retarded Suspension of Ground Granulated Blast-Furnace Slag after Reactivation. Materials 2016, 9, 933.

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