THE PROPERTIES AND RECOGNITION OF DELETERIOUS CHERTS WHICH OCCUR IN AGGREGATE USED BY OHIO CONCRETE PRODUCERS

THE BASIC PROPERTIES OF CHERTS WHCIH OCCUR IN AGGREGATE USED BY OHIO CONCRETE PRODUCERS WERE STUDIED AND THESE PROPERTIES RELATED TO THEIR HARMFUL EFFECTS IN CONCRETE. THE STUDY WILL ATTEMPT TO DEVELOP A METHOD WHICH PERMITS THE FIELD IDENTIFICATION OF BOTH INNOCUOUS AND DELETERIOUS CHERTS. A CLASSIFICATION OF CHERTS BASED ON THEIR PHYSIO- CHEMICAL PROPERTIES INCLUDING SUCH PARAMETERS AS PETROGRAPHY, CHEMICAL NATURE, POROSITY, PERMEABILITY, SPECIFIC GRAVITY, WATER-ABSORPTION AND CRYSTALLINITY WAS DEVELOPED. DETERMINATION IS BEING MADE OF THE EFFECT THAT THE PERCENTAGE OF CHERTS IN THE AGGREGATE HAS ON THE DURABILITY OF CONCRETE BEAMS. THE PROCESS OR PROCESSES INVOLVED IN THE DISINTEGRATION OF CONCRETE WHICH CONTAIN DELETERIOUS CHERTS ARE BEING DETERMINED. NINE CHERTS SAMPLES WERE CHEMICALLY ANALYZED BY GRAVIMETRIC AND SPECTROGRAPHIC ANALYSES AND SOLUBILITY STUDIES CONDUCTED IN ALKALINE SOLUTIONS. THESE CHARACTERISTICS WILL BE RELATED TO TEXTURE WHICH INCLUDES THE SIZE, SHAPE, ARRANGEMENT, SURFACE AREA, FRACTURATION, POROSITY AND PERMEABILITY. PETROGRAPHIC ANALYSES OF CHERT WERE CONDUCTED BY PETROGRAPHIC MICROSCOPY, X-RAY DIFFRACTION STUDIES, ELECTRON MICROSCOPY, AND X-RAY X-RAY RADIOGRAPHY. THE PHYSICAL TESTS BEING CONDUCTED ARE POROSITY, PERMEABILITY, ABSORPTION AND RESORPTION, RESISTANCE TO THERMA/ SHOCK, RESISTANCE TO FREEZING AND THAWING AND COMPRESSIVE STRENGTH.

  • Supplemental Notes:
    • 23pp, 15 ReF
  • Corporate Authors:

    University of Toledo

    Research Foundation
    Toledo, OH  USA 
  • Publication Date: 1963-11-11

Subject/Index Terms

Filing Info

  • Accession Number: 00212295
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 22 1994 12:00AM