EP1922295A1 - Building material - Google Patents

Building material

Info

Publication number
EP1922295A1
EP1922295A1 EP05763434A EP05763434A EP1922295A1 EP 1922295 A1 EP1922295 A1 EP 1922295A1 EP 05763434 A EP05763434 A EP 05763434A EP 05763434 A EP05763434 A EP 05763434A EP 1922295 A1 EP1922295 A1 EP 1922295A1
Authority
EP
European Patent Office
Prior art keywords
aggregate
building material
lightweight
material according
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05763434A
Other languages
German (de)
French (fr)
Inventor
Gösta BROWNUM
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Construnit Holding APS
Original Assignee
Construnit Holding APS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Construnit Holding APS filed Critical Construnit Holding APS
Publication of EP1922295A1 publication Critical patent/EP1922295A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—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
    • C04B28/02—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 containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/14—Minerals of vulcanic origin
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/60—Agents for protection against chemical, physical or biological attack
    • C04B2103/65—Water proofers or repellants

Definitions

  • the invention relates to the building industry; particularly a lightweight building material comprising a mixture of portland cement, water and light aggregate e.g. pumice, scoria or tuff.
  • a lightweight building material comprising a mixture of portland cement, water and light aggregate e.g. pumice, scoria or tuff.
  • lightweight materials are widely used to reduce the weight ratio of cement mixtures and one type of aggregate comprises natural materials, such as pumice, scoria and tuff.
  • the US 6,311 ,444 describes a lightweight concrete masonry of which the aggregates are composed predominantly of lightweight cellular and granular inorganic material.
  • the requirements based on standards for load bearing masonry determine the conditions for such aggregates to be used in cement mixtures.
  • Load-bearing or compressive strength is a key objective, when weak aggregates are admixed to the cement slurry, and pumice, scoria and tuff are definitely low-strength materials and could easily be crushed.
  • the disadvantage of building elements comprising brittle lightweight aggregates is the lower compressive strength obtained.
  • the objective of the invention is to use aggregates treated in such a manner that the disadvantage is partly or fully remedied.
  • the lightweight building material according to the invention comprises a mixture of
  • the aggregate has a coating of a different material e.g. plastic material providing a strong shell around every aggregate particle, and consequently resulting in a building element with a high compressive strength and good insulation properties.
  • a different material e.g. plastic material providing a strong shell around every aggregate particle, and consequently resulting in a building element with a high compressive strength and good insulation properties.
  • the aggregate consists of pumice, scoria or tuff or mixtures thereof.
  • a coating comprised of plastic material will render elasticity and added strength to the lightweight aggregate particles.
  • a coating material providing also a moisture-impermeable barrier in order to maintain good insulation properties.
  • the plastic material should be selected based on having suitable viscosity, adherence and compressive strength, which as an example is a material chosen from the group of thermoplastic materials comprising e.g. polyamide, polyethylene, polyvinyl chloride, polypropylene, polystyrene and polyoxymethylene such as Isoplatal ® 300 UV.
  • thermoplastic materials comprising e.g. polyamide, polyethylene, polyvinyl chloride, polypropylene, polystyrene and polyoxymethylene such as Isoplatal ® 300 UV.
  • the coating material could be applied to the aggregate by a method comprising the steps of melting said plastic material and mixing it with the aggregate in a suitable machine, but also other methods can be considered.
  • a building element formed of the building material according to the invention as described above would have the following composition by weight:
  • SikaAer ® and Viscocrete ® are efficient additives to enhance workability of the cement mixture by aerating and plasticizing a non-vibrated concrete with a high early strength.
  • the 28-days compressive strength will improve by 10-15 MPa above a traditional lightweight concrete, wherein the aggregate is not coated; which usually offers 20-25 MPa. It should be mentioned that the invention is not limited to the composition above, despite it being the best mode known to the inventor.
  • a criterion would be a lowest possible melting temperature which will save energy consumption in the manufacturing process.
  • a polyamide 6 such as Isoplasmid ® 1-27 shows a melting temperature of about 230°C, while a polyacetal (POM) such as Isoplatal ® 300 UV shows an even better melting temperature of 172°C.
  • POM polyacetal
  • a building material according to the invention can be useful to either build larger building elements or to make handling of otherwise heavy elements easier.

Abstract

Building material for lightweight construction comprising a mixture of portland cement, water, and lightweight aggregate, characterized in that the aggregate has a coating of a different material providing a strong shell around substantially each of the aggregate particles, and consequently a high compressive strength.

Description

BUILDING MATERIAL
FIELD OF INVENTION
The invention relates to the building industry; particularly a lightweight building material comprising a mixture of portland cement, water and light aggregate e.g. pumice, scoria or tuff.
It is obvious from reading the technical literature and patents that lightweight materials are widely used to reduce the weight ratio of cement mixtures and one type of aggregate comprises natural materials, such as pumice, scoria and tuff.
The US 6,311 ,444 describes a lightweight concrete masonry of which the aggregates are composed predominantly of lightweight cellular and granular inorganic material. The requirements based on standards for load bearing masonry determine the conditions for such aggregates to be used in cement mixtures.
Load-bearing or compressive strength is a key objective, when weak aggregates are admixed to the cement slurry, and pumice, scoria and tuff are definitely low-strength materials and could easily be crushed.
Such aggregates are also fairly permeable and due to standards regarding masonry this is an issue to comply with, if the resulting lightweight concrete should be used for building houses.
Accordingly, the disadvantage of building elements comprising brittle lightweight aggregates is the lower compressive strength obtained.
Consequently, the objective of the invention is to use aggregates treated in such a manner that the disadvantage is partly or fully remedied.
BRIEF SUMMARY OF THE INVENTION
The lightweight building material according to the invention comprises a mixture of
Portland cement, water, and light aggregate, whereby the aggregate has a coating of a different material e.g. plastic material providing a strong shell around every aggregate particle, and consequently resulting in a building element with a high compressive strength and good insulation properties.
Advantageously, the aggregate consists of pumice, scoria or tuff or mixtures thereof.
A coating comprised of plastic material will render elasticity and added strength to the lightweight aggregate particles.
For some building applications it is advantageous to use a coating material providing also a moisture-impermeable barrier in order to maintain good insulation properties.
The plastic material should be selected based on having suitable viscosity, adherence and compressive strength, which as an example is a material chosen from the group of thermoplastic materials comprising e.g. polyamide, polyethylene, polyvinyl chloride, polypropylene, polystyrene and polyoxymethylene such as Isoplatal® 300 UV.
The coating material could be applied to the aggregate by a method comprising the steps of melting said plastic material and mixing it with the aggregate in a suitable machine, but also other methods can be considered.
DETAILED DESCRIPTION OF THE INVENTION
As an example, a building element formed of the building material according to the invention as described above would have the following composition by weight:
Portland cement 500 water 233
SikaAer 15b 0,80
ViscoCrete 2300H 4,00 coated pumice (0-10 mm) 677
SikaAer® and Viscocrete® are efficient additives to enhance workability of the cement mixture by aerating and plasticizing a non-vibrated concrete with a high early strength.
The 28-days compressive strength will improve by 10-15 MPa above a traditional lightweight concrete, wherein the aggregate is not coated; which usually offers 20-25 MPa. It should be mentioned that the invention is not limited to the composition above, despite it being the best mode known to the inventor.
When selecting the plastic material to apply to the aggregate a criterion would be a lowest possible melting temperature which will save energy consumption in the manufacturing process.
A polyamide 6 such as Isoplasmid® 1-27 shows a melting temperature of about 230°C, while a polyacetal (POM) such as Isoplatal® 300 UV shows an even better melting temperature of 172°C.
The ultimate choice of a plastic material will to a high extend depend on the price of the raw material and the processing costs.
A building material according to the invention can be useful to either build larger building elements or to make handling of otherwise heavy elements easier.

Claims

1. Building material for lightweight construction comprising a mixture of Portland cement, water, and lightweight aggregate, characterized in that the aggregate has a coating of a different material providing a strong shell around substantially each of the aggregate particles, and consequently a high compressive strength.
2. Building material according to claim 1 , characterized in that the aggregate consists of pumice, scoria or tuff or a mixture thereof.
3. Building material according to claim 1 or 2, characterized in that the coating material on the aggregate is selected for its good adherence to the surface of each aggregate particle.
4. Building material according to any of claims 1 to 3, characterized in that the coating provides a moisture-impermeable barrier.
5. Building material according to any of the preceding claims, characterized in that the coating material is a plastic material chosen from the group of thermoplastic materials e.g. a polyamide or a polyacetal.
6. Method of producing a building material for lightweight construction, wherein portland cement, water and a lightweight aggregate are mixed, characterized in that prior to the mixing step the lightweight aggregate is coated with a layer of a different material providing a hard shell around every aggregate particle.
7. Method of producing a building material according to claim 6, characterized in that the coating material is a plastic material.
8. Method of producing a building material according to claim 7, characterized in that the coating material is chosen from the group of thermoplastic materials e.g. a polyamide or a polyacetal.
9. Method of producing a building material according to any of claims 6-8, characterized in that the aggregate is comprised of any suitable lightweight material e.g. pumice, scoria or tuff or a mixture thereof.
10. Aggregate used in a building material according to claim 1 , characterized in that the aggregate consists of pumice, scoria or tuff or a mixture thereof, being coated with a plastic material, preferably a thermoplastic material.
EP05763434A 2005-08-08 2005-08-08 Building material Withdrawn EP1922295A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DK2005/000520 WO2007016925A1 (en) 2005-08-08 2005-08-08 Building material

Publications (1)

Publication Number Publication Date
EP1922295A1 true EP1922295A1 (en) 2008-05-21

Family

ID=35079327

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05763434A Withdrawn EP1922295A1 (en) 2005-08-08 2005-08-08 Building material

Country Status (2)

Country Link
EP (1) EP1922295A1 (en)
WO (1) WO2007016925A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2358913A1 (en) * 1973-11-27 1975-06-05 Chemotechnik Ges Fuer Baustoff POROESE ADDITIVE FOR LIGHTWEIGHT CONCRETE
DE4009906C1 (en) * 1990-03-28 1991-05-16 Deutsche Perlite Gmbh, 4600 Dortmund, De Dry mix for flooring - has specified bulk material with granular fraction and levelling material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007016925A1 *

Also Published As

Publication number Publication date
WO2007016925A1 (en) 2007-02-15

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