VOLUME CHANGES IN SAND-GRAVEL CONCRETE

IN 1942 A REPORT WAS PRESENTED GIVING THE RESULTS OF A LABORATORY INVESTIGATION OF THE VOLUME CHANGE CHARACTERISTICS OF CONCRETE CONTAINING THE "SAND-GRAVEL" TYPE OF AGGREGATE WHICH IS SO ABUNDANT IN KANSAS AND NEBRASKA AND IS USED EXTENSIVELY AS A TOTAL AGGREGATE FOR CONCRETE IN THOSE AREAS. THE RESULTS OF THE EARLIER TESTS ARE REVIEWED, AND ADDITIONAL DATA COVERING FURTHER TESTS UP TO 9 YEARS ARE PRESENTED. FOLLOWING THE VARIOUS CYCLES OF HEATING, COOLING, WETTING, AND DRYING DESCRIBED IN THE 1942 REPORT, THE TEST SPECIMENS (BEAMS 6-BY 6- BY 20-IN. IN SIZE) WERE STORED IN THE MOIST ROOM AT 70 F. FOR APPROXIMATELY 5 YR., AFTER WHICH THEY WERE STORED OUTDOORS ON THE GROUND FOR AN ADDITIONAL 2 YR. MEASUREMENTS MADE AT THE CONCLUSION OF EACH STORAGE PERIOD REVEALED THAT PRACTICALLY ALL OF THE SPECIMENS WHICH HAD DEVELOPED EXCESSIVE EXPANSION AS REPORTED IN 1942 HAD CONTINUED TO EXPAND DURING THE SUBSEQUENT STORAGE PERIODS. BUT, CONCRETE SPECIMENS WHICH HAD NOT EXPANDED EXCESSIVELY UP TO 1942 SHOWED ONLY SLIGHT ADDITIONAL EXPANSION DURING THE SUBSEQUENT MOIST CURING PERIOD, FOLLOWED, AS WOULD BE EXPECTED, BY CONTRACTION DURING THE OUTDOORS EXPOSURE. THE DATA INDICATE THAT WHATEVER INFLUENCES WERE RESPONSIBLE FOR THE EXCESSIVE EXPANSION OF CERTAIN COMBINATIONS INVOLVING THE PLATTE RIVER GRAVEL, THESE INFLUENCES WERE STILL AT WORK DURING THE EXPOSURE PERIODS. THE STUDY OF THE BEHAVIOR OF THE NORMALLY GRADED CONCRETE INDICATES THAT, FOR THE TWO SILICEOUS AGGREGATES, THE SPECIMENS CONTAINING THE TWO "MERRIMAN CEMENTS" SHOWED APPRECIABLY LESS EXPANSION DURING EXPOSURE IN MOIST AIR THAN CONCRETES CONTAINING THE TWO "A.S.T.M." CEMENTS. THESE DIFFERENCES WERE NOT SO MARKED FOR SPECIMENS CONTAINING DOLOMITIC AGGREGATES. /AUTHOR/

  • Supplemental Notes:
    • Vol 29, pp 212-224, 6 FIG, 2 TAB
  • Authors:
    • Jackson, F H
    • Timms, A G
  • Publication Date: 1950

Media Info

  • Monograph Title: Proceedings of the Twenty-Ninth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 13-16, 1949.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00213944
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 25 1971 12:00AM