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Title: Chemical acceleration of a neutral granulated blast-furnace slag activated by sodium carbonate

This paper presents results of a study on chemical acceleration of a neutral granulated blast-furnace slag activated using sodium carbonate. As strength development of alkali-activated slag cements containing neutral GBFS and sodium carbonate as activator at room temperature is known to be slow, three accelerators were investigated: sodium hydroxide, ordinary Portland cement and a combination of silica fume and slaked lime. In all cements, the main hydration product is C–(A)–S–H, but its structure varies between tobermorite and riversideite depending on the accelerator used. Calcite and gaylussite are present in all systems and they were formed due to either cation exchange reaction between the slag and the activator, or carbonation. With accelerators, compressive strength up to 15 MPa can be achieved within 24 h in comparison to 2.5 MPa after 48 h for a mix without an accelerator.
Authors:
; ;
Publication Date:
OSTI Identifier:
22475506
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 72; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BLAST FURNACES; CALCITE; CARBON SULFIDES; COMPARATIVE EVALUATIONS; COMPRESSION STRENGTH; CRYSTAL STRUCTURE; HYDRATION; HYDRIDES; ION EXCHANGE; PORTLAND CEMENT; SILICA; SLAGS; SODIUM CARBONATES; SODIUM HYDROXIDES; TEMPERATURE RANGE 0273-0400 K