最終更新日：2024/07/30
(construction) A weak, milky layer of cement and aggregate fines on a concrete surface that is usually caused by an overwet mixture, overworking the mixture, improper or excessive finishing or combination thereof. Also, could be caused when a slurry mix is used on a deep foundation, where the slurry mix is not completely removed before placing concrete on top.
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laitance
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laitance
noun
(construction)
A
weak,
milky
layer
of
cement
and
aggregate
fines
on
a
concrete
surface
that
is
usually
caused
by
an
overwet
mixture,
overworking
the
mixture,
improper
or
excessive
finishing
or
combination
thereof.
Also,
could
be
caused
when
a
slurry
mix
is
used
on
a
deep
foundation,
where
the
slurry
mix
is
not
completely
removed
before
placing
concrete
on
top.
意味（1）
(construction)
A
weak,
milky
layer
of
cement
and
aggregate
fines
on
a
concrete
surface
that
is
usually
caused
by
an
overwet
mixture,
overworking
the
mixture,
improper
or
excessive
finishing
or
combination
thereof.
Also,
could
be
caused
when
a
slurry
mix
is
used
on
a
deep
foundation,
where
the
slurry
mix
is
not
completely
removed
before
placing
concrete
on
top.
意味（2）
(construction)
The
weak
top
layer
of
cement
and
aggregate
fines
on
a
concrete
surface
that
stands
between
a
topical
coating
and
the
underlying
substrate.
This
laitance
layer
prevents
a
bond
forming
between
the
topical
coating
and
substrate,
whereby
it
causes
delamination
of
the
topical
coating
as
the
laitance
layer
fails
first.
