Expanded Clay Lightweight

lifegunbarrelcityUrban and Civil

Nov 26, 2013 (3 years and 4 months ago)

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Expanded Clay Lightweight
Aggregated Concrete

By
Dulce

Tanya Barrera

MEEN 3344
-
Material Science

10/2/12

Classifications Properties of Lightweight Concrete


LIGHTWEIGHT AND
INSULATING GROUT


Density
:600
-
1000 Kg/cm^3


Mechanical resistance: 25
-
100
Kg/m^2



NON
-
STRUCTURAL
LIGHTWEIGHT CONCRETE


Density
:1000
-
1400

Kg/cm^3


Mechanical resistance: 100
-
150 Kg/m^2



STRUCTURAL
LIGHTWEIGHT CONCRETE


Density
:1400
-
2000Kg/cm^3


Mechanical resistance: higher than
150 Kg/m^2


(Richardson)


Classified based on the
aggregates
chosen to be in the mix.


give concrete specific properties,
such as weight and efficiency.


Can end up being up to 88%
lighter than traditional concretes.


According to ASTM regulations:

lightweight concretes are those
mixtures that range from 60 to
100 pounds per cubic foot (
pcf
).
Anything that is below 60
pcf

is
classified as super light weight
concrete.

(NRMCA)


Leca

Clay Aggregates Features


Shape: Round


Color: shades of black and brown


Texture:


Coarse


Spongy cellular/
Porus

(IMPORTANT!)


This is what makes the clay light weight, because its surface
area creates a lower density product


Mixes well with concrete


Freezing and High temperature Stability


Low Density (light)


High Resistance to pressure (incompressibility)


(
Lecaworld
)

Clay

Composition: Clay is typically moist fine grained natural
material

Shape: No specific shape

Texture: Usually sticky and plastic textured

Color: Depends on impurities, weathering, and
mineralogical composition.

(
Lecaworld
)


Clay
Leca

is used to expand the
moisture retentive clay


makes more dry, less dense
material (can mix better)


Gives it higher resistance to
pressure as well as a lower density

(
Lecaworld
)

Expanded lightweight
concrete process

Pyro
-
processing: Clay to
Leca


By heating shale, clay, or slate to
temperatures in excess of 1800 to 2100
degrees F in a rotary kiln, ceramic
aggregates are made . This causes the
material to expand into an artificial
lightweight aggregate.


“Their cellular pore system gives these
lightweight aggregates their low
-
particle
relative density”



(
Lecaworld
)

Structural Projects

Image from
http://floatingbuilding.com

Floor Slabs

High Rise
Buildings

Image from http://www.concreteconstruction.net

What is it
used for?

Overall


There are three purposes for light weight concrete:


Lightweight and Insulating Grout, Non
-
Structural Lightweight Concrete,
Structural Lightweight Concrete


Concrete is classified based on the aggregates chosen to be in the
mix (gives concrete specific properties)


Through a process called
pyroprocessing

clay is turned into
leca
,
which is then mixed with cement to create Expanded Clay light
weight concrete.


Benefits and Down sides:


Expanded Clay lightweight concrete can prove to be significantly more
expensive than normal weight concrete


Can be an economical solution because less concrete and steel beam
material is utilized due to smaller columns being needed for the design to
withhold.


Low
permiability
, concrete more
recycleble
,
used to reduce a dead load


It is typically utilized in the construction of high rise buildings,
floating structures, floor slabs and bridges.


(
Geofill
, NRMCA,
Laterlite
, Richardson)


References


Richardson, Christopher. "lecaword.com."

LECA
.
N.p
., 28/09/09.
Web. 2 Oct 2012. <http://lecaworld.com/whatis.html>. (Richardson)


Laterlite
. "laterlite.com."

General Catalogue 2007
.
Laterlite
, 2007.
Web. 2 Oct 2012.
(<http://www.laterlite.com/upload/Documenti/Catalogue
-

Part 1
pages 17_MS.pdf>. (
Laterlite
)


NRMCA, . "http://www.nrmca.org."

Concrete in Practice. What, Why,
and How?
.


National Ready Mixed Concrete
Assosiation
, 2003. Web. 5 Sep
2012. <http://www.nrmca.org/aboutconcrete/cips/36p.pdf>.


(NRMCA)


Geofill

Cellular Concrete, . "http://www.geofill.com."
GEOFILL
CELLULAR CONCRETE OVERVIEW
.


GEOFILL CELLULAR CONCRETE, 2008. Web. 5 Sep 2012.
<http://www.geofill.com/?gclid=CIfP78K9nrICFaNeTAodxzgAlw>.
(
Geofill
)