SURFACE CRACKING OF HYDRATED CEMENT PASTES: AN INTERPRETATION

PROBABLE CAUSES OF SURFACE CRACKING OF HYDRATED CEMENT PASTES WERE EXAMINED BY CHEMICAL AND X-RAY DIFFRACTION TECHNIQUES. GOOD CORRELATION WAS FOUND BETWEEN THE TWO TECHNIQUES. DIFFERENCES BETWEEN THE COMPOSITION AND CONSTITUTION OF THE CRACKED SURFACE ZONES OF THE PASTES AND THE REST OF THE MASS ARE ATTRIBUTED TO BLEEDING OF THE AQUEOUS SOLUTION IN THE CEMENT PASTE TOGETHER WITH EXTRACTION OF SOLUBLE ALKALIES AND CALCIUM SULFATE. BLEEDING IS THOUGHT TO BE CAUSED BY AN ABNORMAL PARTICLE SIZE DISTRIBUTION OF CEMENT RESULTING FROM DEFICIENCIES IN THE GRINDING PROCESS. IT ENABLES A GREATER CARBONATION, A GREATER SHRINKAGE AND, POSSIBLY A FASTER SET OF THE SURFACE ZONE, AS COMPARED WITH THE INTERNAL MASS OF THE PASTE.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/sr/sr90/90-013.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:
  • Calleja, J C
  • Trivino, F V
• Publication Date: 1966

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: pp 145-153
• 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: Alkali; Bleeding (Pavements); Calcium; Carbonation; Cement; Chemical analysis; Concrete; Cracking; Diffraction; Hydration; Methodology; Pastes; Resource extraction; Sets; Shrinkage; Sulfates; Surfaces; X rays
• Uncontrolled Terms: Extraction (Chemistry); Particle size distribution; Surface cracks; X-ray diffraction
• Old TRIS Terms: Alkalies
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00212301
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Dec 22 1994 12:00AM