Composite concrete

Details Composite concrete Composite concrete

1997-07-24

2000-06-27

Marcheschi, Michael

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106643, 106640, 106641, 106642, 106711, 106737, 106694, 106695, 106696, 106705, 106706, 106708, 106709, 106710, 106714, 106738, 106817, 106811, C04B 1406, C04B 1414, C04B 1430, C04B 1438

Patent

active

060802340

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a composite concrete with a low cement and fibres content having good mechanical properties, and also possessing good impacts, shocks and projectiles protection properties.


PRIOR ART

In January 1990, the publication of the French Patent Application No. 2,633,922 disclosed a compacted concrete comprising: 31.5 mm, concretes admixtures, and ashes or of ultrafines.
This concrete must be compacted in order to reach its maximum mechanical properties. However, despite the compacting operation, it still has relatively low mechanical properties. This is why it is difficult to find applications for it other than as industrial slabs, roadways, aircraft runways, platforms and roadsides.
In June 1990, French Patent Application No. 2,640,962 proposed a composite concrete comprising, in parts by weight per 100 parts of hydraulic binder: angular (120 to 200 parts);
Moreover, this composite concrete having a relatively high cement and fibres content is reputed to be capable of limiting the penetration of projectiles. However, this property is neither demonstrated nor illustrated.
DE-A-3,734,327 describes a structural element capable of withstanding the penetration of projectiles. These elements are produced by means of a composite concrete comprising a hydraulic binder composed of a cement (Z35 to 55:270 to 450 kg/m.sup.3), hard additives (basalt, quartz or quartzite, either by themselves or mixed) having a size of at least 4 mm, silica powder (1850 to 1500 kg/m.sup.3) and fibres (steel, glass, synthetic, and carbon fibres).
Since this concrete contains no dispersing agent or plasticizer, the mixing-water content is, in a known manner, generally greater than 30% by weight, leading to slight mechanical properties, in particular with regard to the compression strength and flexural strength, and more particularly with regard to the depth of penetration of projectiles which cannot be other than important. These mechanical properties are, however, neither demonstrated nor illustrated in the description.
U.S. Pat. No. 4,472,201 proposes a composite concrete, having good heat stability, for a different field of application, which contains:
This concrete may also include metal fibres, glass fibres, ceramic fibres, carbon fibres, alumina fibres or other types of fibres.
However, this composite concrete contains a large amount of mixing water, leading to slight mechanical properties, in particular for the compression strength and flexural strength, which would lead, ipso facto, to a significant depth of penetration of projectiles in the case of this composition being used for protection.
All the prior art (and especially FR-A-2,633,922) shows that there is a technical prejudice which considers that, compared to conventional cast concretes, only concretes requiring compaction have a lower water content.
There therefore has not existed, until now, a concrete which could be casted or intended to be compacted having both good mechanical properties while still having a low cement, fibres and water content. This concrete would additionally be advantageous if it also possessed good impact, shock and projectile protection properties.


BRIEF DESCRIPTION OF THE INVENTION

The Applicant has therefore managed to fill the gap mentioned above by developing a composite concrete of the type comprising a hydraulic binder, aggregates, an admixture, fibres and mixing water, characterized in that it comprises: which may range from 0.01 to 3 mm up to 0.01 to 50 mm, and 1 .mu.m, i.e. between 10.sup.-5 and 10.sup.-3 .mu.m, particle size of between 1 and 10 .mu.m, i.e. between 10.sup.-3 and 10.sup.-2 .mu.m,
the percentages all being percentages by weight relative to the sum of the weights of constituents a) to e).
This concrete therefore offers at least the following advantages:
Further advantages of this concrete will appear on reading the description below.


DETAILED DESCRIPTION OF THE INVENTION

The particles (A) of the concrete according to the invention have a particle size distribution which may range from 0.01 to 3 mm

REFERENCES:
patent: 4229225 (1980-10-01), Kraszewski et al.
patent: 4472201 (1984-09-01), Ochi et al.
patent: 4780141 (1988-10-01), Double et al.
patent: 5447564 (1995-09-01), Xie et al.
patent: 5522926 (1996-06-01), Richard et al.
patent: 5783297 (1998-07-01), Wise et al.

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