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Title: Calcium sulfoaluminate (Ye'elimite) hydration in the presence of gypsum, calcite, and vaterite

Six calcium sulfoaluminate-based cementitious systems composed of calcium sulfoaluminate, calcite, vaterite, and gypsum were cured as pastes and mortars for 1, 7, 28 and 84 days. Pastes were analyzed with X-ray diffraction, thermogravimetric and differential thermal analyses. Mortars were tested for compressive strength, dimensional stability and setting time. Furthermore, pastes with a water/cementitious material mass ratio of 0.80 were tested for heat evolution during the first 48 h by means of isothermal conduction calorimetry. It has been found that: (1) both calcite and vaterite reacted with monosulfoaluminate to give monocarboaluminate and ettringite, with vaterite being more reactive; (2) gypsum lowered the reactivity of both carbonates; (3) expansion was reduced by calcite and vaterite, irrespective of the presence of gypsum; and (4) both carbonates increased compressive strength in the absence of gypsum and decreased compressive strength less in the presence of gypsum, with vaterite's action more effective than that of calcite.
Authors:
 [1] ;  [2] ;  [1]
  1. Department of Civil and Environmental Engineering, University of California, Berkeley, CA (United States)
  2. School of Engineering, University of Basilicata, Potenza (Italy)
Publication Date:
OSTI Identifier:
22395925
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 65; Other Information: Copyright (c) 2014 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; CALCITE; CALCIUM; CALORIMETRY; CARBONATES; COMPRESSION STRENGTH; GYPSUM; HYDRATION; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION