INFLUENCE OF MEASUREMENT TECHNIQUE ON THE AIR-VOID STRUCTURE OF HARDENED CONCRETE

The air-void structure in hardened concrete exposed to subzero temperatures must fulfill certain requirements. A reliable estimation of the relevant air-void parameters is essential. Generally, polished plane sections or thin sections are applied for air-void analysis of hardened concrete. This paper presents an examination of the influence of the type of sample applied for air-void analysis of hardened concrete. Air-void measurements of ten different concretes are presented. For each concrete, three thin sections and three plane sections are made and analyzed according to American Society for Testing and Materials (ASTM) C 457. Findings revealed that the air content measured on thin sections is generally lower than the air content measured on plane sections. A theoretical evaluation postulates that the finite thickness of thin sections leads to a systematic error in the determination of the air content of concrete. The results of the theoretical and experimental work correspond well. The authors conclude that when thin sections are applied for air-void analysis, the apparent air content will be systematically lower than the true air content.

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  • English

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  • Accession Number: 00716470
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 18 1996 12:00AM