PAVEMENT STRUCTURE - GREAT BRITAIN

REFERENCE IS MADE TO THE REPORT TO THE XIITH CONGRESS DEALING WITH TYPE I AND TYPE II AGGREGATES FOR SUB-BASES. TYPE I IS NOT GENERALLY AVAILABLE AND INCREASING USE HAS BEEN MADE OF STABILIZED TYPE II AGGREGATES. PULVERIZED FUEL ASH HAS SOMETIMES BEEN FOUND SUITABLE FOR STABILIZATION. DETAILS ARE GIVEN OF SPECIFICATIONS FOR CEMENT STABILIZED MATERIALS. THE SECOND EDITION OF ROAD NOTE 29 PERMITS A REDUCTION IN THE THICKNESS OF ROLLED ASPHALT AND DENSE COATED MACADAM AS ROAD BASE MATERIALS. ON ROADS OF LOW TRAFFIC INTENSITY THE REDUCTION IN THICKNESS IS THE SAME FOR EACH MATERIAL BUT WITH HIGHER TRAFFIC VALUES ROLLED ASPHALT BASE OFFERS THE GREATER ECONOMY IN THICKNESS. SPECIFICATIONS FOR CEMENT STABILIZED AND LEAN CONCRETE BASES ARE GIVEN. THE USE OF RUBBER TIRED ROLLERS HAS INCREASED SINCE THE LAST CONGRESS, BUT MORE WORK HAS BEEN DONE ON THE IMPROVEMENT OF MATERIALS WHICH ARE EASY TO COMPACT, THAN ON COMPACTING MACHINERY. A SURVEY OF ROADS HAVING LEAN CONCRETE OR CEMENT STABILIZED BASES HAS BEEN CARRIED OUT TO INVESTIGATE THE PROBLEM OF CRACKING. THE POSSIBLE CAUSES OF CRACKING ARE DISCUSSED AS IS THE PROBLEM OF LAYING A FLEXIBLE SURFACE OVER REINFORCED CONCRETE LAID IN SLABS. CHEMICAL STABILIZATION HAS NOT BEEN WIDELY USED IN THE UNITED KINGDOM MAINLY FOR ECONOMIC REASONS. NO SUITABLE AGENTS HAVE YET BEEN FOUND FOR ORGANIC SOIL AND HEAVY CLAYS. PULVERIZED FUEL ASH MIXED WITH LIME HAS A STABILIZING EFFECT WITH GRANULAR SOILS SIMILAR TO CEMENT. THE ACTION IS SLOWER BUT, WITHIN CERTAIN LIMITS, AN ADEQUATE RESULT IS OBTAINED USING THE CHEAPER MATERIALS. B.X. 1924 'METHODS OF TEST FOR STABILIZED SOILS' HAS RECENTLY BEEN REVISED. /AUTHOR/

  • Supplemental Notes:
    • No Iii-9, pP 4-16, 5 FIG, 7 TAB
  • Authors:
    • Jenner, H N
  • Publication Date: 0

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  • Accession Number: 00231257
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 2004 2:41AM