SOURCE OF THE NON-MIGRATABLE IONIC CHARGES DEVELOPED BY PORTLAND AND HIGH-ALUMINA CEMENTS DURING HYDRATION

THE NATURE OF THE NON-MIGRATABLE IONIC CHARGES CHARACTERISTIC OF SOME OF THE MAJOR AND MINOR CONSTITUENTS OF HYDRATED PORTLAND AND HIGH-ALUMINA CEMENTS HAS BEEN INVESTIGATED. USING A SILVER POSITIVE ION AND A BROMINE NEGATIVE ION AS INDICATOR IONS IT WAS FOUND THAT MONO- CALCIUM SILICATE HYDRATE (CSH(B)), THE MAJOR CONSTITUENT OF HYDRATED PORTLAND CEMENTS, POSSESSED A NON-MIGRATABLE NEGATIVE IONIC CHARGE, WHEREAS CALCIUM HYDROXIDE, ALWAYS PRESENT IN ABUNDANCE IN THE HYDRATING CEMENT, POSSESSED A POSITIVE IONIC CHARGE. TREATING CSH(B) WITH SATURATED AQUEOUS CALCIUM HYDROXIDE SOLUTION RESULTED IN A POSITIVE IONIC CHARGE ON THE RESULTING CSH(B), CALCIUM HYDROXIDE COMPLEX, SIMILAR TO THAT FOUND FOR HYDRATED PORTLAND CEMENTS. FOR THE HIGH-ALUMINA CEMENTS (LUMNITE, CIMENT FONDU, AND ALCOA) THE NON-MIGRATABLE IONIC CHARGES ON THE HYDRATED PRODUCTS (WHICH ARE DEPENDENT ON THE TIME AND PARTICULARLY SENSITIVE TO THE TEMPERATURE OF HYDRATION) WERE FOUND ALSO TO CORRELATE QUALITATIVELY WITH THE CALCIUM ALUMINATE HYDRATES KNOWN TO EXIST OVER CERTAIN TEMPERATURE RANGES. IN ADDITION, A SUPERIMPOSED CHARACTERISTIC WAS APPARENTLY CONTRIBUTED BY THE SMALL PERCENTAGE OF CALCIUM SULFIDE PRESENT. /AUTHOR/

• Record URL:
  • https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/37/37-014.pdf
• Supplemental Notes:
  • Vol 37, pp 256-270, 7 FIG, 6 TAB, 24 REF. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Pike, R G
  • Hubbard, D
• Publication Date: 1958

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Thirty-Seventh Annual Meeting of the Highway Research Board, Washington, D.C., January 6-10, 1958
• Serial:
  • Highway Research Board Proceedings
  • Volume: 37
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Aluminous cement; High early strength cement; Hydration; Ions; Portland cement
• Old TRIS Terms: Charge /electric/
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213979
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Sep 27 1971 12:00AM