Experimental Considerations on Judging Adequacy of Consolidation in Fresh Concrete


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Title: Experimental Considerations on Judging Adequacy of Consolidation in Fresh Concrete

Author(s): Makaoto Kagaya, Hiroshi Tokuda, andMakoto Kawakami

Publication: Special Publication

Volume: 96


Appears on pages(s): 161-178

Keywords: coarse aggregates; compressive strength; concretes; consolidation; fresh concretes; lightweight concretes; modulus of elasticity; vibration; tensile strength; vibration; vibrators (machinery); water-cement ratio; Materials Research

Date: 1/1/1987

Adequate consolidating condition of concrete is generally judged by experiential observation, and even in such condition the internal composition differs from one in a specified mix partially as introduced in several papers and books. Furthermore, there are a number of unclarified points regarding this phenomenon, such as the relationship between consolidating condition and internal composition in fresh state and the properties in hardened state. This study was carried out to clear the adequate consolidating condition quantitatively based on the variation degree of internal composition measured by mix analysis and of mechanical properties. The vertical distributions of air content, water-cement ratio, unit contents of materials, compressive strength, tensile strength, and modulus of elasticity were measured in the prismatic test piece casted with changing the vibrating time. A parameter to evaluate the consolidating condition was proposed from the time-dependent variations of these distributions. The adequate condition is judged from this parameter, and the method for determining this one in situ was proposed also.