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1. (EP0560837) LIGHTWEIGHT AGGREGATE

Office : European Patent Office
Application Number: 92900196 Application Date: 05.12.1991
Publication Number: 0560837 Publication Date: 22.09.1993
Publication Kind : B1
Designated States: BE, DE, DK, ES, FR, GB, GR, IT, NL
Prior PCT appl.: Application Number:GB1991002157 ; Publication Number: Click to see the data
IPC:
C04B 16/10
C04B 18/02
C04B 28/08
C04B 38/08
C CHEMISTRY; METALLURGY
04
CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
B
LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
16
Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
04
Macromolecular compounds
08
porous, e.g. expanded polystyrene beads
10
Treatment for enhancing the mixability with the mortar
C CHEMISTRY; METALLURGY
04
CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
B
LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
18
Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
02
Agglomerated materials
C CHEMISTRY; METALLURGY
04
CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
B
LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
28
Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
02
containing hydraulic cements other than calcium sulfates
08
Slag cements
C CHEMISTRY; METALLURGY
04
CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
B
LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
38
Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
08
by adding porous substances
CPC:
C04B 18/027
Y02W 30/92
Applicants: NAT POWER PLC
Inventors: WALKER BRYAN JAMES
Priority Data: 9026682 07.12.1990 GB
9102157 05.12.1991 GB
Title: (DE) Leichte Zuschlastoffe
(EN) LIGHTWEIGHT AGGREGATE
(FR) AGREGAT LEGER
Abstract:
(EN) The present invention relates to a lightweight aggregate in the form of pellets or granules and, in particular to a lightweight aggregate in the form of pellets or granules for use in the building industry. The present invention provides a method for forming a lightweight aggregate comprising mixing together from 80 % to 99 % by weight of pulverised fuel ash, from 1 % to 20 % by weight of cement and an amount of polystyrene beads having a particle size of less than 2.5 millimetres, such that the volume of polystyrene beads is from 15 % to 80 % of the total volume of the final mixture to form a pelletisable mix, forming the mix into pellets having a diameter of less than 15 millimetres and curing the pellets in a moist atmosphere at a temperature below the vapourising temperature of any solvent within the polystyrene beads.
(FR) La présente invention se rapporte à un agrégat sous forme de boulettes ou granules et, en particulier à un agrégat en forme de boulettes ou de granules destinés à être utilisés dans l'industrie du bâtiment. Selon l'invention, le procédé permet d'obtenir un agrégat léger et comprend: la préparation d'un mélange de 80 % à 99 % en poids de cendres de combustibles pulvérisés, de 1 % à 20 % en poids de ciment ainsi que d'une quantité de billes de polystyrène possédant une granulométrie inférieure à 2,5 millimètres de sorte que le volume de billes de polystyrène se situe entre 15 % et 80 % du volume total constituant le mélange final de façon à former un mélange granulé; la formation du mélange granulé comprenant des boulettes d'un diamètre inférieur à 15 millimètres et le durcissement des boulettes dans une atmosphère humide à une température inférieure à la température de vaporisation d'un solvant quelconque à l'intérieur des billes de polystyrène.
Also published as:
ES2089487JPH06503061CA2097699DE000069119606AU1991090349DK0560837
WO/1992/010438