GB2312894A - Aggregate for electrically conductive concrete - Google Patents

Aggregate for electrically conductive concrete Download PDF

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Publication number
GB2312894A
GB2312894A GB9707403A GB9707403A GB2312894A GB 2312894 A GB2312894 A GB 2312894A GB 9707403 A GB9707403 A GB 9707403A GB 9707403 A GB9707403 A GB 9707403A GB 2312894 A GB2312894 A GB 2312894A
Authority
GB
United Kingdom
Prior art keywords
aggregate
weight
emulsifier
electrically conductive
conductive concrete
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Withdrawn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
GB9707403A
Other versions
GB9707403D0 (en
Inventor
Neil Bailey
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.)
Patricia Bailey
Original Assignee
Patricia Bailey
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
Priority claimed from GBGB9609797.7A external-priority patent/GB9609797D0/en
Application filed by Patricia Bailey filed Critical Patricia Bailey
Priority to GB9707403A priority Critical patent/GB2312894A/en
Publication of GB9707403D0 publication Critical patent/GB9707403D0/en
Publication of GB2312894A publication Critical patent/GB2312894A/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Withdrawn legal-status Critical Current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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C04B40/0042—Powdery mixtures
    • 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
    • C04B14/022—Carbon
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/08—Treating solid fuels to improve their combustion by heat treatments, e.g. calcining
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/26—Corrosion of reinforcement resistance

Abstract

Aggregate is disclosed for mixing with an emulsifier in order to form an electrically conductive concrete upon solidifying of the emulsifier. The aggregate comprises petroleum coke that is calcined at a high temperature for a period of time sufficient to ensure a content of no less than 98.1% by weight pure carbon, no more than 0.8% by weight of sulfur and no more than 0.1% by weight of sulfates. The low sulfur content provides a final concrete of neutral pH so that metal items set therein are less prone to corrosion.

Description

Conductive Concrete The present invention relates to an aggregate for producing electrically conductive concrete.
It has previously been proposed to render concrete electrically conductive by the addition of carbon.
Electrically conductive concrete is desirable when it is desired to earth an electrical conductor. The electrically conductive concrete is poured into a hole, or matrix of trenches, dug in the ground and the electrode to be earthed is set within the concrete.
It has been found that the electrode being earthed through the electrically conductive concrete, which is commonly made of copper, tends to corrode by reacting over a period of time with the concrete and the aim of the present invention is to mitigate this disadvantage found with prior art compositions.
In accordance with the present invention, there is provided an aggregate for mixing with an emulsifier in order to form an electrically conductive concrete upon solidifying of the emulsifier, the aggregate comprising petroleum coke that is calcined at a high temperature for a period of time sufficient to ensure a content of no less than 98.1% by weight pure carbon, no more than 0.8% by weight of sulphur and no more than 0.1% by weight of sulphates.
The invention is predicated on the realisation that corrosion of the embedded electrode is the result of acidity in the concrete and the reduction in the sulphur and sulphate content result from calcining the petroleum coke in a kiln, ensures that the set concrete is chemically neutral, i.e. that it has a pH value of 7.
It is also preferred that any hydrocarbqns and any other organic volatile matter in the aggregate should not exceed 0.2% by weight.
The moisture content of the aggregate should preferably not exceeds 0.2t by weight and any ash in the aggregate should not exceed 0.2% by weight.
The aggregate may be sold separately for mixing with any proprietary cement mixture, preferably in a ratio of between 2:1 and 3:1 by weight before water is added. It is however preferred to supply the aggregate in the form of a premix to which the user need only add water.
The premix may in this case consist of the petroleum coke aggregate and an emulsifier that may suitably include one or more materials selected from the group consisting of clinker, calcium silicate, aluminium oxide, ferrous oxide, magnesium oxide and calcium sulphate.
The optimum sieve mesh dimensions of the aggregate and the emulsifier and the consistency of the mix after the addition of water will vary with the application. If the concrete is to be set into a deep hole then a thin fine consistency is preferred whereas for pouring into shallow trenches a thicker coarser consistency is preferred.
The petroleum coke is preferably calcined by heating in a rotary kiln to a temperature that preferably lies within the range from 4000C to 9000C.

Claims (8)

1. An aggregate for mixing with an emulsifier in order to form an electrically conductive concrete upon solidifying of the emulsifier, the aggregate comprising petroleum coke that is calcined at a high temperature for a period of time sufficient to ensure a content of no less than 98.1% by weight pure carbon, no more than 0.8% by weight of sulphur and no more than 0.1% by weight of sulphates.
2. An aggregate as claimed in claim 1, wherein the quantity of any hydrocarbons or other organic volatile material present in the aggregate does not exceed 0.2% by weight.
3. An aggregate as claimed in claim 1 or 2, wherein the moisture content of the aggregate does not exceed 0.2% by weight.
4. An aggregate as claimed in any preceding claim, where the ash content of the aggregate does not exceed 0.2% by weight.
5. An aggregate as claimed in any preceding claim, wherein the petroleum coke is calcined by heating in a rotary kiln to a temperature within the range from 400"C to 900"C.
6. A premix for forming electrically conductive concrete comprising an aggregate as claimed in any preceding claim and an emulsifier.
7. A premix as claimed in claim 6, wherein the emulsifier one or more materials selected from the group consisting of clinker, calcium silicate, aluminium oxide, ferrous oxide, magnesium oxide and calcium sulphate.
8. A premix as claimed in claim 6 or 7, wherein the aggregate is premixed with the emulsifier in a ratio of between 2:1 and 3:1 by weight before water is added.
GB9707403A 1996-05-10 1997-04-11 Aggregate for electrically conductive concrete Withdrawn GB2312894A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9707403A GB2312894A (en) 1996-05-10 1997-04-11 Aggregate for electrically conductive concrete

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9609797.7A GB9609797D0 (en) 1996-05-10 1996-05-10 Conductive concrete
GB9707403A GB2312894A (en) 1996-05-10 1997-04-11 Aggregate for electrically conductive concrete

Publications (2)

Publication Number Publication Date
GB9707403D0 GB9707403D0 (en) 1997-05-28
GB2312894A true GB2312894A (en) 1997-11-12

Family

ID=26309305

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9707403A Withdrawn GB2312894A (en) 1996-05-10 1997-04-11 Aggregate for electrically conductive concrete

Country Status (1)

Country Link
GB (1) GB2312894A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1445611A (en) * 1973-02-07 1976-08-11 Marconi Co Ltd Electrically conducting arrangements
US4288407A (en) * 1975-07-01 1981-09-08 Markel Richard F Method and apparatus for treating material in a fluidized bed
GB2093061A (en) * 1981-02-12 1982-08-25 Great Lakes Carbon Corp Process for calcining and desulfurizing petroleum coke
GB2283017A (en) * 1993-10-23 1995-04-26 Veitsch Radex Ag Refractory ceramic mass
WO1996000197A1 (en) * 1994-06-24 1996-01-04 Elfinco S.A. Electrically conductive building material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1445611A (en) * 1973-02-07 1976-08-11 Marconi Co Ltd Electrically conducting arrangements
US4288407A (en) * 1975-07-01 1981-09-08 Markel Richard F Method and apparatus for treating material in a fluidized bed
GB2093061A (en) * 1981-02-12 1982-08-25 Great Lakes Carbon Corp Process for calcining and desulfurizing petroleum coke
GB2283017A (en) * 1993-10-23 1995-04-26 Veitsch Radex Ag Refractory ceramic mass
WO1996000197A1 (en) * 1994-06-24 1996-01-04 Elfinco S.A. Electrically conductive building material

Also Published As

Publication number Publication date
GB9707403D0 (en) 1997-05-28

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)