FIELD CONTROL OF CONCRETE MAKING-A STUDY OF LATE PRACTICE

SOME CASES ARE REVIEWED IN WHICH THE ACTUAL CONCRETING OPERATION WAS CAREFULLY CONTROLLED ACCORDING TO SCIENTIFIC PRINCIPLES. FOUR PRINCIPAL CHARACTERISTICS OF CONCRETE FOR WHICH CONTROL IS NEEDED ARE: STRENGTH, UNIFORMITY, DURABILITY, AND ECONOMY OF MIXTURE. THESE CHARACTERISTICS ARE BRIEFLY REVIEWED AND DISCUSSED. THE FIELD PRACTICES OF SEVERAL ORGANIZATIONS IN CHARGE OF CONCRETE WORK OF GREAT MAGNITUDE TAKE FULL COGNIZANCE OF THE EFFECTS OF THE WATER-CEMENT RATIO UPON THE STRENGTH OF CONCRETE AND OF THE SIZE AND GRADING OF PARTICLES ON ECONOMICAL DESIGN. FOR MAXIMUM UNIFORMITY EACH BATCH SHOULD CONTAIN THE SAME ABSOLUTE VOLUMES OF WATER, CEMENT AND AGGREGATES OF UNIFORM GRADING. THE ADVANTAGES OF MEASURING GRANULAR MATERIALS BY WEIGHT ARE BECOMING EXTENSIVELY RECOGNIZED AND THE INUNDATION METHOD FOR MEASURING SAND IS BEING USED. THE METHODS EMPLOYED BY SEVERAL LARGE ORGANIZATIONS ARE REVIEWED. THE COMMITTEE ON ROAD MATERIALS IS OF THE OPINION THAT METHODS OF DESIGN TO YIELD CONCRETE OF DEFINITE STRENGTH SHOULD BE USED. THEY RECOMMEND: (1) MEASUREMENT OF AGGREGATES BY DIRECT WEIGHT, OR INUNDATION WHERE APPLICABLE, (2) REQUIRED ACCURATE MEASUREMENT OF WATER, (3) REQUIRED USE OF A DEFINITE AMOUNT OF WATER PER SACK OF CEMENT, AND (4) REQUIRED USE OF AGGREGATES OF CONSTANT GRADING AS PREDETERMINED.

  • Supplemental Notes:
    • Vol 6, pp 232-244, 7 FIG
  • Authors:
    • Crum, R W
  • Publication Date: 1927

Media Info

  • Monograph Title: Proceedings of the Sixth Annual Meeting of the Highway Research Board Held at Washington, D.C., December 2-3, 1926
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00213732
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 11 1971 12:00AM