Simulation of SCC Flow.
Simulation of SCC Flow.
(2318 K)
Martys, N. S.; Ferraris, C. F.
Design and Use of Self-Consolidation Concrete. North
American Conference, 1st. November 12-13, 2002, 27-30
pp, 2003.
Keywords:
simulation; concretes; rheology; self-consolidating
concrete (SCC); Dissipative Particle Dynamics (DPD)
Abstract:
In principle, self-consolidating concrete (SCC) should
allow for the easy movement of concrete around flow
obstructions under its own weight without the use of
external vibration. The flow of concrete around barriers
will depend on a variety of factors, including the
concrete or mortar viscosity, the yield stress and the
size distribution and shape of the coarse aggregate.
Modeling the flow of complex fluids like concrete
presents a great research challenge because of the
necessity of accounting for the polydisperse motion of
the aggregate, while, simultaneously solving the
Navier-Stokes equations for the liquid phase in which
they are immersed. Numerous schemes (1) have been
developed using many standard cdmputational approaches
for solving the Navier-Stokes equations with moving
rigid bodies. In general though, they are rather
complicated and demand very large computational
resources. Recently some novel approaches (2), based on
cellular automata methods (lattice Boltzmann and
dissipative particle dynanucs (DPD)) have shown great
promise for modeling a varIety of complex flow problems.
DPD has been shown to be particularly well suited for
modeling complex systems like suspensions. This paper
will give some highlights of the method and some
examples of applications to SCC technology.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899