Basics of Concrete Science by Professor L. Dvorkin, Professor O. Dvorkin - HTML preview
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CHAPTER 2
CONCRETE MIXTURES
L. Dvorkin and O.Dvorkin
2.1. Structure and rheological properties
Concrete mix is a system in which cement paste and water bind aggregates such
as sand and gravel or crushed stone into a homogeneous mass.
The coefficient of internal friction relies mainly on the coarseness of aggregates
and can be approximately calculated on the Lermit and Turnon formula:
where d - middle diameter of particles of
f
lgadb
=
, (2.1
)
aggregate; a and b - constants.
The rheological model of concrete mixture is usually characterized by
the Shvedov-Bingam formula:
dV
τ = τ
+
,
(2.2)