FABRIC OF SOIL CEMENTS

DUPLICATE TEST CORES OF TWO SOIL-CEMENTS WERE ANALYZED BY DIFFRACTION PATTERNS AND PHOTOMICROGRAPHS OF THIN SECTIONS. THE RESULTS OF COMPRESSIVE STRENGTH TESTS AND DURABILITY TESTS WERE COMPARED WITH RESULTS OBTAINED BY THE AUTHORS. LARGE VOIDS WERE SHOWN TO EXIST IN THE FIRST CORE, WHICH WEAKENED THE SOIL CEMENT AND DECREASED ITS DURABILITY. EFFORTS SHOULD BE MADE TO DECREASE THE VOID SPACE. BY: (1) FURTHER COMPACTION WITH VIBRATION OR COMPACTION THAT INCORPORATES PENETRATION (SHEEPS-FOOT ROLLERS) FOR INITIAL COMPACTION, (2) BY THE ADDITION OF BORROW SOIL THAT HAS HIGHER PROPORTIONS OF BINDER, OR (3) BY INCREASING THE AMOUNT OF PORTLAND CEMENT ADDED. THE FABRIC PROPERTIES OF THE SECOND CORE APPEAR TO BE VERY GOOD FOR MAXIMUM STRENGTH DURABILITY. THE PHYSICAL MIXING IS EXCELLENT BETWEEN THE SOIL AND CEMENT AND THE VOIDS ARE SMALL AND NOT INTERCONNECTED. IT IS CONCLUDED THAT THE PORTLAND CEMENT IN A RELATIVELY (POROUS) AND CHEMICALLY INERT A-3 (0) SOIL UNDERGOES REACTIONS PRODUCING CALCITE WHEREAS THE REACTIONS IN THE A-4 (7) SOIL ARE POSSIBLY SLOWER AND INVOLVE REACTIONS WITH COLLOIDAL ALUMINO-SILICATES WITHOUT CALCITE BEING FORMED. COMPARISONS OF MINERALOGICAL ANALYSES OF THE SOIL PRIOR TO CORE PREPARATION SHOULD BE HELPFUL IN FUTURE STUDIES IN DETERMINING MINERALOGICAL CHANGES INDUCED BY ADDITION OF WATER AND PORTLAND CEMENT.

  • Supplemental Notes:
    • 10 Pp, 2 FiG, 1 TAB, 2 REF, 1 APP
  • Corporate Authors:

    Arkansas State Highway Department

    Division of Planning and Research, P.O. Box 2261
    Little Rock, AR  USA  72203
  • Authors:
    • Horn, M E
    • Coston, W R
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00231293
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Aug 15 2004 2:24AM