SOME RECENT CONCEPTS ON PORTLAND CEMENT HYDRATION AND HARDENING

PROGRESS HAS BEEN ACHIEVED IN UNDERSTANDING THE ESSENCE OF THE PROCESS OF HARDENING OF BINDING MATERIALS BUT SOME PRIMARY QUESTIONS OF THE THEORY OF HARDENING HAVE NOT BEEN ANSWERED. SOME OF THESE QUESTIONS ARE DISCUSSED ON THE BASIS OF EXPERIMENTAL AND THEORETICAL CONSIDERATIONS. NEW DATA ON COMPOSITION OF THE LIQUID PHASE FORMED DURING HARDENING OF PORTLAND CEMENT PASTES, OBTAINED WITH A SPECIALLY CONSTRUCTED FILTER PRESS, AT AGES OF 2 MIN TO 28 DAYS ARE GIVEN. THE POSSIBILITY OF CEMENT HYDRATION BY TOP CHEMICAL PATTERN ON THE BASIS OF MICROSCOPIC EVIDENCE SHOWING FORMATION OF SHORT-LIFE UNSTABLE PRIMARY PRODUCTS IS DISCUSSED. THE STRUCTURE OF NEW FORMATIONS IS CONSIDERED A GENERAL ASPECT OF THE HARDENING PROCESS, TAKING INTO ACCOUNT THE PRESENCE OF STRUCTURE-FORMING PROCESSES ALONG WITH DESTRUCTIVE ONES, THUS SUGGESTING THAT THE PROCESS OF CEMENT HARDENING IS INTERNALLY CONTRADICTORY. SOME EXPERIMENTAL AND THEORETICAL ASPECTS OF EXTRA-RAPID HARDENING CONCRETES ARE CONSIDERED. AT THE AGE OF 15 TO 30 MIN SUCH CONCRETES DEVELOP STRENGTH NECESSARY FOR STRIPPING AND TRANSPORTATION, THUS PERMITTING THE OPTIMUM DESIGN OF AN AUTOMATED PLANT FOR PRODUCTION OF REINFORCED CONCRETE ARTICLES.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/sr/sr90/90-037.pdf
• Supplemental Notes:
  • 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
• Corporate Authors:

  Highway Research Board (HRB)

  Washington, DC   
• Authors:
  • Budnikov, P P
  • Strelkov, M I
• Publication Date: 1966

Media Info

• Media Type: Print
• Features: Photos; References; Tables;
• Pagination: p. 447-464
• Monograph Title: Symposium on structure of Portland cement paste and concrete
• Serial:
  • Highway Research Board Special Report
  • Issue Number: 90
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Binders; Concrete hardening; Filters; Hardness; Hydration; Liquids; Microscopy; Pastes; Phase transitions; Portland cement; Production; Reinforced concrete; Theory
• Old TRIS Terms: Filter presses; Liquid phases
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00212461
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Nov 18 2001 12:00AM