AN X-RAY DIFFRACTION INVESTIGATION OF HYDRATED PORTLAND CEMENT PASTES

A NUMBER OF WELL-HYDRATED PASTES OF A GROUP OF 8 PORTLAND CEMENTS OF DIFFERING COMPOSITIONS HAVE BEEN EXAMINED BY MEANS OF X-RAY DIFFRACTION. THE CALCIUM SILICATE HYDRATE PHASE IS VERY MUCH LIKE THE TOBERMORITE OBTAINED BY THE PASTE HYDRATION OF TRICALCIUM SILICATE OR BETAMORITE SILICATE. THE OTHER HYDRATION PRODUCTS FOUND IN CEMENT PASTES ARE BOTH CALCIUM SULFOALUMINATES, A HYDROGARNET TYPE HYDRATED CALCIUM ALUMINOFERRITE, AND A TETRACALCIUM ALUMINATE HYDRATE. THE LOW SULFATE SULFOALUMINATE FORMS IN CEMENTS WITH RELATIVELY HIGH TRICALCIUM ALUMINATE CONTENTS AT THE EXPENSE OF THE HIGH SULFATE FORM. THE HIGH SULFATE FORM REMAINS IN CEMENTS LOW IN TRICALCIUM ALUMINATE. /PCA/

• Authors:
  • Kantro, D L
  • Copeland, L E
  • Anderson, E R
• Publication Date: 0

Media Info

• Serial:
  • Portland Cement Assoc R & D Lab Bull
  • Issue Number: 0

Subject/Index Terms

• TRT Terms: Aluminates; Calcium compounds; Diffraction; Ferrites; Hydrates; Hydration; Pastes; Portland cement; Silicates; Sulfates; Tobermorite; X rays
• Uncontrolled Terms: X-ray diffraction
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213569
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 128
• Files: TRIS
• Created Date: Jun 1 1970 12:00AM