SPONTANEOUS CRACKING OF CONCRETE

FISSURATION SPONTANEE DU BETON HYDRAULIQUE

THE AIM OF THE RESEARCH IS TO INVESTIGATE THE CAUSE OF PARASITICAL STRESSES WHICH CAUSE EARLY CRACKING IN CONCRETE STRUCTURES. A SPECIAL STUDY WILL BE MADE OF SECONDARY SHRINKAGE PHENOMENA WHICH RESULT IN SPONTANEOUS CRACKING. DURING PREVIOUS YEARS, THE IMPORTANCE OF SECONDARY SHRINKAGE WAS DEMONSTRATED TOGETHER WITH THE POSSIBILITY OF MEASURING IT WITH SIMPLE TECHNIQUES. THESE MEASUREMENTS MUST NOW BE MADE OPERATIONAL. IN 1979, IT IS ENVISAGED: TO DEVELOP A SIMPLIFIED TEST: INTERLABORATORY TESTS, TEST PROCEDURE; TO CONDUCT A SYSTEMATIC STUDY OF SECONDARY SHRINKAGE: INFLUENCE OF PLASTICIZERS AND RECORDING OF SECONDARY SHRINKAGE ON TEN CEMENTS USED IN PRESTRESSING; TO STUDY SECONDARY SHRINKAGE MECHANISM. THIS RESEARCH REPLACES PART OF RESEARCH PROJECT IRRD NO 500232.