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Dynamic compaction process of zero-slump concrete is investigated experimentally and analytically. AE activity was measured in the compactability test. Based on Biots two-phase theory, the BEM analysis was conducted to clarify the distribution of pore pressures. Results are summarized, as follows: (1) It is found that pore pressures were high at the bottom and the top regions, keeping low values around the center. Under dynamic vibration, the pressures varied drastically up to 100 sec. elapsed. It is observed that concrete of higher water-to-ratio generated lower pressures. (2) P-wave velocities increased gradually under vibration, while the permeability coefficients decreased remarkably. The behavior of the latter was similar to the height of the samaple, as they acceleratedly decreased up to 50 sec. elapsed and then gradually decrease. Concerning AE activity, there existed a clear transtion at the period around 100 sec. elapsed, which was substantially compatible to the behavior of the pore pressure. (3) Pore pressures measured during experiments were directly compared with those of the analysis. Agreement between pressures in the experiment and those in the analysis was remarkable. With the increase in the vibration period, the pore pressures at the bottom and at the top increase. Still the pressures at the center do not vary, keeping low. This implies that the compactibility test actually drive the vibratory compaction only at the end regions of the sample.
Dynamic compaction process of zero-slump concrete is investigated experimentally and analytically. AE activity was measured in the compactability test. Based on Biots two-phase theory, the BEM analysis was conducted to clarify the distribution of pore pressures. Results are summarized, as follows: (1) It is found that pore pressures were high at the bottom and the top regions, keeping low values around the center. Under dynamic vibration, the pressures varied drastically up to 100 sec. elapsed. It is observed that concrete of higher water-to-ratio generated lower pressures. (2) P-wave velocities increased gradually under vibration, while the permeability coefficients decreased remarkably. The behavior of the latter was similar to the height of the samaple, as they acceleratedly decreased up to 50 sec. elapsed and then gradually decrease. Concerning AE activity, there existed a clear transtion at the period around 100 sec. elapsed, which was substantially compatible to the behavior of the pore pressure. (3) Pore pressures measured during experiments were directly compared with those of the analysis. Agreement between pressures in the experiment and those in the analysis was remarkable. With the increase in the vibration period, the pore pressures at the bottom and at the top increase. Still the pressures at the center do not vary, keeping low. This implies that the compactibility test actually drive the vibratory compaction only at the end regions of the sample.
AE observation in compactibility test and simulation of pore pressure distribution in fresh concrete
Schallemissionsbeobachtungen in Versuchen zur Verdichtung und Simulation der Porendruckverteilung in frischem Beton
Ohtsu, M. (author)
2006
8 Seiten
Conference paper
Storage medium
English
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