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BEM analysis of Biot’s model for dynamic compaction of concrete in successive placement



Title: BEM analysis of Biot’s model for dynamic compaction of concrete in successive placement
Author(s): M. Ohtsu, F. Kunisue, K. Nogami
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 38
Issue: 282
Issue date: 2005-10-01
Publication year: 2005
Pages: 739 - 745
Total Pages: 7
Nb references: 8
Language: English


Abstract: Dynamic compaction process is analyzed by applying the boundary element method (BEM) based on Biot’s two-phase model of solid and liquid.
In order to analyze mixed concrete, concrete properties at early ages are determined experimentally.
Applying these properties, pore-pressure distribution under dynamic compaction is calculated.
A feasibility of the analysis is confirmed by the compaction test.
Varying the intervals between the first placement and the second, experimentally jointed beams of concrete are made and tested under bending.
Analyzing BEM models of two layers, pore-pressure distributions under vibration are analyzed, taking into account the effect of placing intervals.
It is demonstrated that pore-pressure distribution may not drastically change until 3 to 4 hours after placement, suggesting that the underlying layer is still responsive to vibration.
Distributions of pore pressures analyzed are compared with the strengths of beams.
Thus, good correlation between the bending strengths of jointed beams and generation of pore pressures at the joint is confirmed.
It is confirmed that low pore-pressure around the joint could result in the decrease in the bending strength, sometimes leading to nucleation of cold joints.


Online publication: 2005-02-15
Classification: Scientific Reports
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/14245


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