Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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TITLE OF THE INVENTION
CEMENT COMPOSITION
FIELD OF THE INVENTION
The present invention relates to a novel cement composition,
this composition of cement of two components as defined in the
claim. The composition of this c~°ment makes it suitable for
combination with a number of different products, including
residual materials the polystyrene, glass, cork, fibreglass,
cellulose fibers, wood fibers and wood shavings, as well as with
the zonolite, vermiculite and minerals.
BACKGROUND OF THE INVENTION
In cement and concrete technology, considerable effort has
been devoted to developing nigh-strength materials with
increased durability.
Cement-based materials are extremely complex substances
containing inorganic, solid, crystalline and amorphous
components. Their properties clepend upon permeability,
porosity, dimensional stability, mechanical strength and the
nature of the bonds between the numerous components.
Interfacial investigations have resulted in a better understanding
of the compositional and microstructural changes on the
durability and properties of cement-based materials, allowing
for innovation in this field.
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Portland cement concrete, which is a composite material, is
currently the most widely used manufactured material. Based
on observations worldwide, the future of concrete looks
promising because it offers suitable engineering properties at
low cost combined with energy-sa~~ing and ecological benefits.
Despite this, there are notable limitations to the use of cement,
since it has low strain capacity and is therefore a brittle material.
More recently in the history of cement, the use of residual
materials in cement-based composites the silica fume, slag, fly
ash and polymers, among others, has stirred an even greater
interest in cement technology. For example, rubber tires have
been successful reused as an addition to cement paste. The use
of such residual materials in cemen~~ compositions not only results
in new products with interesting properties, but greatly aids in
eliminating environmental waste
The flurry of activity in cement technology is indicative of a
widespread interest for cost effective yet strong and durable
concretes that may be tailored for use in a number of different
applications. The present invention seeks to meet this and other
needs.
OBJECTS OF THE INVENTION
The general object of the present invention is therefore to
provide a new cement composition. This composition is suitable
for combination with recycled materials polystyrene.
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SLIlvIMARY OF THE INVENTION
In accordance with the present invention, there is provided a
novel cement composition comprising a binding agent and
cement. This novel cement composition may additionally
include other materials so as to create concrete products that
are suitable for various applications. The resultant concrete has
desirable physical characteristics, the ability to maintain its
integrity ( by being resistant to the degradation or chipping, for
example) through dozens of freeze-taw cycles. It serves the
additional ecological purpose of eliminating waste that is too
often relegated to landfill sites.
Composition of binding agent
1 - An acrylic polymer emulsion;
2 - A vinyl acetate/ethylene copolymer emulsion;
3 - Water added to the first twa components, above. The
volume of water to be added will range from a ratio of 1:1
to 3:1 measured relative to the volume of the first two
components;
The mixture of the there components will have a pH between 6
and 8.
Cement
1 - 3 parts by volume of Portland cement;
2 - 7 parts by volume of an inorganic aggregate, sand and/or
silica with a maximum size of 8C~ Mesh.
Combining the binding agent with 'the cement results in an inert
concrete upon water evaporation. Recycled materials for
example expanded polystyrene in particle, may be added to
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the cement/concrete binding agent mixture in a proportion that
is 3 times the volume of the cerr~ent/concrete binding agent
mixture to create a variety of concrete products.
The cement/binding agent mixture may be combined with
other types of residual materials, according to need or demand.
The concrete resulting from the combination of the
cement/binding agent mixture has physical properties that
demonstrate an excellent adhesion to a residues the glass, cork,
fibreglass, cellulose fibers, wood fibers, wood shavings, etc. It
may also be combined with zonolite, vermiculite and minerals.
The final composition will depend on the required characteristics
of the concrete, aggregates of different sizes being added for
different purposes, as known to tho~;e of skill in the art.
The present invention further includes the use of the novel
cement composition in a number of applications. For example,
it may be molded to prepare panels that are suitable for the
construction of walls.
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Other objects, advantages and features of the present invention
will become more apparent upon reading of the following non
restrictive description of preferred embodiments.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Definitions: Unless otherwise spe<.ified, the terms used in the
present application have the meanings that a person of skill in
the art would normally attribute to them.
DETAILED DESCRIPTION
The present invention relates to a novel cement composition
comprising a binding agent and cement. It may additionally
comprise recycled materials, polystyrene, glass, cork, fibreglass,
cellulose fibers, wood fibers, wood shavings, etc. or be
combined with zonolite, vermiculite and minerals.
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Comaosition of binding anent
1 - An acrylic polymer emulsion;
2 - A vinyl acetate/ethylene copolymer emulsion;
3 - Water added to the first two components, above. The
volume of water to be added will range from a ratio of 1:1
l0 to 3:1 measured relative to the volume of the two
components.
The mixture of the three components will have a pH between 6
and 8.
Cement
1- 3 parts by volume Portland cement;
2- 7 parts by volume of an inorganic aggregate, sand and/or
silica with a maximum size of 8G Mesh.
Combining the binding agent with the cement results in an inert
concrete upon water evaporation. Recycled materials,
expanded polystyrene particles for example, may be added to
the cement/concrete binding agent mixture in a proportion of 3
times the volume of the cement/concrete binding agent
mixture to create a variety of concrete products.
The cement/binding agent mixture may be combined with
other types of residual materials, according to need or demand.
The concrete resulting from the combination of the
cement/binding agent mixture has physical properties that
demonstrate an excellent adhesion to a residues, glass, cork,
fibreglass, cellulose fibers, wood fibE:rs, wood shaving, etc. It may
also be combined with zonolite, vermiculite and minerals. The
final composition will depend on the required characteristics of
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the concrete, aggregates of diff~srent sizes being added for
different purposes, as known to tho,e of skill in the art.
The cement composition of the present invention may be used
in a number of applications where cement has been
traditionally used. Interestingly, when recycled polystyrene
which has been shredded is ad~~ed to the cement/binding
agent described above, the prod pct is a lightweight concrete
that is sturdy yet malleable enough that it can be molded into
various shapes to suit specific purposes. For example, the
cement/binding agent/polystyrene concrete can be converted
into slabs that can be used in building construction.
EXAMPLE 1: Preparation of a cement composition
Bindina agent
A binding agent was prepared by combining 1 volume of
Rhoplex tm AC-2829 acrylic polymer emulsion ( 52-54% solid by
weight, residual monomers < 0.05, aqueous ammonia 1336-21-6
0.2 max, water 7732-18-5 from 46-4.8%) with 2 volumes of Airflex
tm 526BP vinyl acetate/ethylene copolymer emulsion( < 0.01 2-
methyl-4-isothiazolin-3-one, 40-60'.~o vinyl acetate/ethylene
copolymer, 40-60% water ) Water was added in a quantity the
volume of the combined solution of the acrylic polymer and the
vinyl-acetate/ethylene copolymer emulsions. ( It was noted
experimentally that a volume of v~~ater between 1-3 times the
volume of the combined acrylic polymer emulsion and vinyl-
acetate/ethylene copolymer emulsion can be added,
depending on the desired characteristics of the final concrete
product.) The final binding agent solution had a pH between 6
and 8;
Cement
3 parts by volume of Portland cernent were combined with 7
parts by volume of an inorganic aggregate, sand and/or silica,
with a maximum size of 80 Mesh.
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Combining the binding agent with the cement resulted in an
inert concrete upon water evaporation.
EXAMPLE 2: Preparation of a cement composition
The cement composition of Exarnple 1 was combined with
shredded recycled expanded polystyrene ( PS ). It was
determined experimentally that a volume of the cement
composition can be combined with 3 volumes of ( PS ).
Samples of concrete produced in this manner were subjected to
freeze-thaw cycles to measure their durability. In one test, the
concrete was found not to flake or scale after 15 freeze-thaw
cycles. In another test, the concrete was found to have
remained intact even after having been subjected to 110
freeze-thaw cycles.
Although the present invention has been described
hereinabove by way of preferred embodiments thereof, it can
be modified without departing from the spirit, scope and nature
of the subject invention, as defined in the appended claims.
