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A pozzolan is a “siliceous or siliceous and
aluminous material, which in itself possesses
little or no cementitious valve but will, in
finely divided form and in the presence of
moisture, chemically react with calcium
hydroxide at ordinary temperatures to form
compounds possessing cementitious properties”
(ASTM)
Cement consists of three types of materials; (1)
limestone (CaCO3), (2) aluminum silicate (clay
or shale), and (3) inert materials such as sand
and gravel. The limestone and clay are fired
together in a rotary kiln. The limestone
decomposes to lime (CaO) which reacts with the
clay or shale to form “clinker”. Clinker
consists of tricalcium silicate, dicalcium
silicate, tricalcium aluminate, and tetra
calcium aluminate ferrite. The clinker is finely
ground generally in a ball mill to make
“cement”.
In “Portland-pozzolan” cement 10 to 25% of the
cement can be replaced by zeolite which is a
natural pozzolan.
Please click to read:
"A NEW LOOK TO AN OLD POZZOLAN: CLINOPTILOLITE –
A PROMISING POZZOLAN IN CONCRETE"
by Dipayan Jana,
Construction Materials Consultants, Inc. and
Applied Petrographic Services, Inc., Greensburg,
PA 15601 USA, from PROCEEDINGS OF THE
TWENTY-NINTH CONFERENCE ON CEMENT MICROSCOPY
QUEBEC CITY, PQ, CANADA MAY 20 -24, 2007
(PDF format)
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BENEFITS OF USING BRZ™ AS
A POZZOLAN |
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INCREASED COMPRESSIVE STRENGTH due to
the porous crystalline structure and
high surface area of the zeolite, the
hydrated phases of lime pozzolan are
enhanced and this increases the
compressive strength. The Company has
run numerous tests that are available.
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DECREASES ALKALI-SILICA EXPANSION. BRZ™
allows the use of clinkers with more
than 0.60% Na2O. (Limit of ASTM
description). The zeolite isolates the
excess sodium in its crystal lattice.
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HELPS RESIST UNDERWATER CORROSION
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POWER SAVINGS The production of 1 kg of
clinker requires 900 Kcal of energy. Ten
tons of BRZ™ used as a natural pozzolan
to replace Portland cement saves about 1
ton of fuel.
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IMPROVED CHEMICAL RESISTANCE especially
in salt water applications.
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DECREASE INSTABILITY CAUSED BY EXCESS
LIME IN THE SET CEMENT
LIGHTWEIGHT CEMENT
BRZ™ can be heat treated to form lightweight
cement. When heated it loses water. When
mixed into a cement mixture it rehydrates
and releases air. The “foam” or “air
entrainment” increases strength and
decreases weight. BRZ™ can be used to replace
fumed silica in light weight cement.
LIGHTWEIGHT AGGREGATE
BRZ™ expands into a lightweight aggregate at
temperatures between 1200o
and 1400o C.
Its density is about 0.8 g/cc, and it has a
porosity of up to 65%. Light-weight
aggregate is commonly used in Japan.
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here for a full sized image
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-----
Original Message -----
From: "Werner, Orville" <Owerner@CTLThompson.com>
To: "Mike Floersch (E-mail)" <mikef@blackfoot.net>
Sent: Tuesday, January 20, 2004
10:45 AM
Subject: 28-day resultsimages_new\email1-850.jpg
> Mike,
>
> This material achieved an
incredible amount of strength
from 7 days to 28
days. Combined with a high-range
water reducer, it may compete
favorably
with silica fume and super-fimages_new\email1-850.jpgine
fly ash.
>images_new\email1-850.jpg
> Orville R. Werner II, P. E.
> Principal
> Commercial Testing
Laboratories Inc.
> A Division of
> CTL | THOMPSON, INC.
> 1971 W. 12th Ave.
> Denver, CO. 80204
> 303-825-0777
> fax: 303-825-4252
> www.ctlt.com
>
> Information contained herein
is neither necessarily complete
nor accurate.
Final stamped and signed
documents govern. Use of these
data is solely at
the user's risk. By accessing
the data contained in these
files the user
agrees to indemnify, hold
harmless and defend CTL |
Thompson, Inc.,
CTL*Thompson Texas, LLC and
Commercial Testing Laboratories
Inc., their
employees, officers and agents
from any and all claims arising
from the use
of the data. |
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