GB2087406A - Bituminous composition - Google Patents

Abstract

A bituminous composition contains a rubber containing adhesive, bitumen, natural asphalt and either a particulate filler or a thinner or both. The composition may also contain chopped waste paper so that when set in the traditional way for concrete a lightweight fireproof material of high thermal insulation value is obtained.

Description

SPECIFICATION Bituminous composition This invention relates to a bituminous composition. This composition of the invention is particularly, but not exclusively, suitable for the manufacture of waterproof sealants, preservatives for timber, and additives for cementitious products, the main field of application being the building and construction industry.

According to the present invention there is provided a bituminous composition comprising a rubber-containing adhesive bitumen, natural asphalt and either particulate filler or a thinner or both.

The particulate filler may be sand, cement, aggregate, lime or other such materials. The composition may contain water.

In one preferred embodiment of the invention the composition may contain cementitious material and chopped cellulosic material such as waste paper. When set, in the traditional way for concrete, a lightweight fireproof block of high thermal insulation value is obtained.

When a portion of thinner such as white spirit is included in the composition to obtain a suitable consistency, the composition may be sprayed or brushed on to surfaces to waterproof same. A relatively thin liquid composition applied to timber provides a wood staining effect and preserves the timber against fungal attack.

By incorporating fibrous material, such as glass fibres, into the composition a viscous mix is suitable for use as a sealant for roofs and floors. it retains a degree of flexibility which is of particular advantage in that cracking is prevented if the floor or roof is liable to slight movement.

The invention will now be described, by way of illustration only, in the following Examples. Parts quoted are by volume.

EXAMPLE 1 Concrete additive To 1 part of a basic mix of rubber-containing adhesive, bitumen and natural asphalt there were added 7 parts of white spirit and 1 part bitumen paint. This produced an additive for incorporation in a standard concrete mix.

Two series of independent physical testing of blocks of concrete produced and described were carried out, with the following results (compared with similar blocks without additive).

TABLE 1 First Series of Tests Mix - 3 x granolithic crushed to " to one part cement.

Age -28 days.

Without With Additive Additive Weight 7.686 Kg 8.273 Kg Density 2,280 Kg/m3 2,340 Kg/m3 Max. load 360 kN 590 kN Ult. stress 16.0 MN/m2 25.5 MN/m2 SECOND SERIES OF TESTS Cubes of size 1 5 cm x 1 5 cm x 1 5 cm were cast, with and without the treatment of additive. An average of 3 results is taken. The compound was mixed with water at the time of introduction of water into the mixer. A range of 6 mixes has been tried, ranging from the very lean to the rich mixes. After mixing, firstly the compacting factor test was taken, after which the cubes were cast in the standard manner by hand compaction. The cubes were tested after 28 days of curing, in laboratory in ideal conditions.

The performance of the compound is depicted by tlie accompanying tables. The compressive strengths of the very rich mixes after addition of additive, are, however, beyond he range of the machine in use (100 Metric Tonnes).

TABLE 2

Concrete Mix 1:2:4 1:2:4, treated with additive 1/2% of weight of concrete.

W/C Ratio 0.56 0.56 C.F. 0.832 0.899 Age in days 28 28 Average Weight (Kg) 8.690 8.945 Average Density (Kg/M3) 2575 2650 Average Max Load (M.T.) 58.70 Over 95.0 Average Ult.

Stress (Kg/CM2) 260.74 Over 422.22 EXAMPLE 2 Waterproof coating A mix of rubber-containing adhesive, natural asphalt and bitumen was thinned by adding white spirit and then coated on to bricks (5 coats).

Water absorption tests gave the following results.

TABLE 3-WITH COATING

No Size cms. Oven dry Weight after Gain in Absorpt weight Kg immersion in weight Kg. ion % water Kg. 1 22.2 x 10.0 2.060 2.275 0.215 10.44 2 22.5 x 10.2 2.270 2.540 3 22.2 x 10.0 2.130 2.425 0.275 12.79 4 23.0 x 10.0 2.315 2.625 0.310 13.39 5 22.5 x 10.0 2.240 2.470 0.230 1 10.27

Average water absorption = 11.76% TABLE 4 - WITHOUT COATING

No Size cms Over dry Weight after Gain in Absorpt-l weight Kg Immerslon rn weight Kg. ion % water Kg.

6 22.5 x 10.2 2.200 2.855 0.575 25.22 7 22.4 x 10.0 2.170 2.675 8 22.8 x 10.0 2.230 2.765 0.535 23.99 9 22.5 x 10.0 2.090 2.605 0.515 24.64 10 22.2 x 10.2 2.200 2.750 0.550 25.00 Average water absorption = 24.52% EXAMPLE 3 Preservative Mix: 12 parts white spirit.

1 part mix of rubber-containing adhesive, butumen and natural asphalt.

2 parts bitumen paint.

A mobile liquid was obtained, applicable by spraying, brushing or dipping to timber or metai. The applied coating prevents rusting of steel and prevents fungal attack of timber (and imparts thereto an attractive dark stain). It is possible once the applied coating has dried to paint on top. The darkness of the stain can be controlled simpiy by applying more or less of the liquid as required and the tints available vary from light to dark colours.

EXAMPLE 4 Roofing seal Standard Grade: 1 part mix of rubber-containing adhesive, bitumen and natural asphalt.

3 parts butumen paint.

Heavy Grade: As standard grade but 1 part paint replaced with 1 part chopped fibreglass.

Roofing seal can be applied by brushing or trowelling and forms a flexible waterproof barrier.

EXAMPLE 5 Flooring Mix: 2 parts mix of rubber-containing adhesive, bitumen and natural asphalt.

5 parts bitumen paint.

1 part fibreglass fibres.

This was then mixed 1:3 with cement and was applicable by trowel to floors. It may also be used as a seat for water tanks. It can be applied to both horizontal and vertical surfaces.

EXAMPLE 6 Dry concrete mix Mix: 10 parts white spirit.

1 part rubber-containing adhesive, bitumen and natural asphalt.

1.5 parts bitumen paint.

This was added to a moisture free 4:2:1 concrete mix and stored in bags. The bags placed in situ can be used for consolidating river banks, railway embankments and the like.

EXAMPLE 7 Mortar additive Mix: 10 parts white spirit.

1 part rubber-containing adhesive bitumen and natural asphalt.

1.5 parts bitumen paint.

When added to a standard mortar mix waterproof properties are imparted to the mortar. The waterproof mortar can be used for roughcasting and cement rendering. Within a very short time after application the mortar can quite significantly be seen to repel water.

EXAMPLE 8 Paper pulp concrete Mix: 2 parts rubber-containing adhesive bitumen and natural asphalt.

3 parts bitumen paint.

20 parts water.

Comminuted waste paper was added and allowed to absorb the mix. The impregnated paper pulp (4 parts) was mixed with 1 part cement and 1 part washed fine sand and cast into blocks.

The blocks so produced withstood intense heat applied over a period of one week. They could be roughly handled, were easily cut with a saw and had good thermal insulation properties. The block seemed not to be susceptible to fungal attack, a common problem encountered in the use of waste paper compositions. No evidence of fungal attack had appeared after several months of exposure to the elements.

It will be appreciated that the composition has wide general application in the building industry as a sealant or as an additive to various cementitious mixes. It increases strength and imparts waterproof properties.

Claims (6)

1. A bituminous composition comprising a rubber-containing adhesive, butumen, natural asphalt and either particulate filler or a thinner or both.

2. A composition according to claim 1, in which the filler is sand, cement, aggregate or lime.

3. A composition as claimed in claim 1, which contains cementitious material and chopped cellulosic material.

4. A composition as claimed in claim 3, in which the cellulosic material is paper.

5. A composition as claimed in any preceding claim which contains glass fibre.

6. A composition as claimed in any preceding claim, substantially as hereinbefore described.