DURABILITY OF LIGHTWEIGHT CONCRETE PHASE II-WETTING AND DRYING TESTS PHASE III-FREEZING AND THAWING TESTS

LABORATORY RESEARCH IS DESCRIBED ON THE DURABILITY OF LIGHTWEIGHT CONCRETE. IT COVERS TWO PHASES OF A 3-PHASE STUDY; PHASE II, WETTING AND DRYING TESTS OF LIGHTWEIGHT CONCRETE, AND PHASE III, FREEZING AND THAWING TESTS OF LIGHTWEIGHT CONCRETE. THE TESTING PROGRAM COVERED THREE SOURCES OF LIGHTWEIGHT AGGREGATE AND ONE SOURCE OF SAND AND GRAVEL. SPECIMENS MADE FROM CONCRETE MIXES CONTAINING VARIOUS CEMENT CONTENTS AND AGGREGATE GRADATIONS, WITH THE MOISTURE CONTENT OF THE AGGREGATE VARIED, WERE SUBJECTED TO REPEATED CYCLES OF SUBMERGING IN WATER AND DRYING IN AN OVEN AND TO RAPID FREEZING IN AIR AND THAWING IN WATER. COMPLETE PHYSICAL TESTS SUCH AS GRADATION, UNIT WEIGHT, ABRASION AND SOUNDNESS LOSS WERE RUN ON THE AGGREGATES. THE RESULTS OF FREEZING AND THAWING TESTS INDICATE THAT THE LIGHTWEIGHT CONCRETE MIXES WERE MORE RESISTANT TO FREEZING AND THAWING DAMAGE THAN THE SAND AND GRAVEL MIX USED AS A REFERENCE. LIGHTWEIGHT FINE AGGREGATE SHOULD NOT HAVE MORE THAN 20 PERCENT PASSING THE NO. 100 SIEVE. THE OTHER VARIABLES FOR THIS PHASE SHOWED NO DEFINITE TRENDS. THE RESULTS OF THE WETTING AND DRYING TESTS WERE NOT AS CLEARLY DEFINED, WITH ONE SOURCE OF LIGHTWEIGHT AGGREGATE PERFORMING BETTER THAN THE REFERENCE SAND AND GRAVEL MIX, WHILE THE OTHER TWO SOURCES OF LIGHTWEIGHT AGGREGATE WERE LESS DURABLE. IT SHOULD BE POINTED OUT THAT THESE TEST RESULTS ARE APPLICABLE ONLY TO THE MATERIAL SOURCES WHICH WERE STUDIED. /BPR/

  • Supplemental Notes:
    • Hpr, 61-8c
  • Corporate Authors:

    Louisiana Department of Highways

    Research and Development Section
    Baton Rouge, LA  United States 
  • Authors:
    • Rushing, H B
  • Publication Date: 1966-12

Subject/Index Terms

Filing Info

  • Accession Number: 00212014
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Oct 23 1994 12:00AM