MECHANISM OF SEAWATER ATTACK ON CEMENT PASTES

TYPE I (WHITE), II, AND V (ZERO TRICALCIUM ALUMINATE) CEMENT PASTES OF WATER-CEMENT RATIOS OF 0.3 AND 0.5 WERE IMMERSED IN SEAWATER AND SOLUTIONS OF SODIUM AND MAGNESIUM SULFATES. THE ATTACK ON THE CEMENT PASTES WAS INTERPRETED IN TERMS OF KINDS, AMOUNTS, AND LOCATION OF THE REACTION PRODUCTS IN THE PASTES. X-RAY DIFFRACTION AND DIFFERENTIAL THERMAL ANALYSIS WERE USED IN STUDYING THE SPECIMENS. ETTRINGITE IN TYPE I CEMENT PASTES PRECIPITATED AS CRYSTALS. GROWTH OF THESE IN CONFINED SITES CAUSED EXPANSION. THE ETTRINGITE IN TYPE V CEMENT PASTES PRECIPITATED AND PERSISTED AS A GEL. SINCE THERE WAS NO CRYSTAL GROWTH, EXPANSION DID NOT OCCUR. THE ROLE OF CHLOROALUMINATE, BRUCITE, AND GYPSUM IS DISCUSSED. /AUTHOR/

• Supplemental Notes:
  • Proc Vol 67, NO 2, PP 187-192
• Authors:
  • Kalousek, G L
  • Benton, E J
• Publication Date: 1970-2

Media Info

• Serial:
  • Am Concrete Inst Journal & Proceedings

Subject/Index Terms

• TRT Terms: Cement; Differential thermal analysis; Diffraction; Ettringite; Expansion; Gypsum; Magnesium; Pastes; Seawater; Sodium; Solutions (Chemistry); Sulfates; Water cement ratio; X rays
• Uncontrolled Terms: Immersion; X-ray diffraction
• Old TRIS Terms: Solutions
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213678
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 1 1970 12:00AM