GB2463310A - A method of forming concrete containing waste paper sludge - Google Patents
A method of forming concrete containing waste paper sludge Download PDFInfo
- Publication number
- GB2463310A GB2463310A GB0816055A GB0816055A GB2463310A GB 2463310 A GB2463310 A GB 2463310A GB 0816055 A GB0816055 A GB 0816055A GB 0816055 A GB0816055 A GB 0816055A GB 2463310 A GB2463310 A GB 2463310A
- Authority
- GB
- United Kingdom
- Prior art keywords
- waste paper
- paper sludge
- concrete
- stabilising compound
- cement
- 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- Withdrawn
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 37
- 239000010893 paper waste Substances 0.000 title claims abstract description 34
- 239000004567 concrete Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 21
- 150000001875 compounds Chemical class 0.000 claims abstract description 17
- 230000003019 stabilising effect Effects 0.000 claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000011398 Portland cement Substances 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 230000000887 hydrating effect Effects 0.000 claims abstract description 6
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 3
- 235000019738 Limestone Nutrition 0.000 claims abstract description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 3
- 239000004571 lime Substances 0.000 claims abstract description 3
- 239000006028 limestone Substances 0.000 claims abstract description 3
- 239000002893 slag Substances 0.000 claims abstract description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 230000036571 hydration Effects 0.000 claims description 2
- 238000006703 hydration reaction Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000000203 mixture Substances 0.000 description 5
- 239000003381 stabilizer Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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
- C04B16/00—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
- C04B16/02—Cellulosic materials
-
- 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
- C04B18/00—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
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
- C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
- C04B18/241—Paper, e.g. waste paper; Paper pulp
- C04B18/243—Waste from paper processing or recycling paper, e.g. de-inking sludge
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0094—Agents for altering or buffering the pH; Ingredients characterised by their pH
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
A method of production of concrete is disclosed where the method comprises the steps of:1. Providing waste paper sludge;2. Adding a stabilising compound and hydrating fluid to the waste paper sludge, the stabilising compound having a pH value greater than 10;3. Adding aggregate; and 4. Adding a cementitious material. The stabilising compound may be limestone, lime, blast furnace slag or paper ash. The cementitious material may be Portland cement. Also disclosed is a mortar comprising cement and waste paper sludge and aggregate.
Description
CONCRETE PRODUCTION USING WASTE PAPER SLUDGE
Background to the invention
The present invention relates to a method of production of concrete using waste paper sludge, including recycled waste paper sludge. In addition, the present invention relates to concrete produced from waste paper sludge.
Waste paper sludge is a by-product of the papermaking industry and results from the recycling and cle-inking process of recovering paper fibres. Currently, waste paper sludge is utilised as land spread as a low grade fertiliser for agricultural crops. Such a use for waste paper sludge, although currently permissible in the United Kingdom, is not permitted in many other European countries. However, the United Kingdom is set to come into line with European legislation and such disposal of waste paper sludge as land spread is likely to become more tightly controlled if not prohibited completely.
There is therefore a need to develop a process to utilise waste paper sludge to allow recycling and avoid the need to dispose of waste paper sludge in the conventional land spread manner.
Attempts have been made in the prior art to produce cement boards using Portland cement mixed with waste paper sludge. However, the cement boards took at least three weeks to fully dry or required drying in an oven to speed up the drying process. Unfortunately, the resulting cement boards, once finally hardened had very little strength and were therefore unusable.
As a result of the failure to incorporate waste paper sludge in usable cement boards, no potential future has been envisaged in the use of waste paper sludge in the production of concrete.
Summary of the Invention
The present invention seeks to address the problems of the prior art.
Accordingly, a first aspect of the present invention provides a method of production of concrete, the method comprising the steps of: a. Providing waste paper sludge; b. Adding a stabilising compound and hydrating fluid to the waste paper sludge, the stabilising compound having a pH value greater than 10; c. Adding aggregate; and d. Adding a cementitous material.
The hydrating fluid is preferably water. However, it will be appreciated that any other suitable aqueous or non-aqueous fluid may be used as an alternative to or in addition to water.
The hydrating fluid may be mixed with the waste paper sludge before the addition of the stabilising compound. Alternatively, the stabilising compound may be mixed with the waste paper sludge before hydration.
Preferably, the stabilising compound has a pH greater than 12 and may have a pH value of up to 14.
Waste paper sludge has a pH value typically between 7 and 8. It was not previously appreciated that the pH value of waste paper sludge was interfering with the chemical reactions involved in concrete production, resulting in slow setting and minimal strength of the resultant concrete. It is important that the stabilising compound is greater than 10 in order to raise the pH of the waste paper sludge so as to minimise the inhibition of the chemical reactions required to product concrete from cement and waste paper sludge.
The stabilising compound may be selected from any material with a pH greater than around 10 such as, but not restricted to the group consisting of limestone, lime, blast furnace slag, paper.
Preferably, the cementitious material comprises Portland cement or composite Portland cements. However, it is to be appreciated that any suitable cement known to the skilled person may be used as an alternative to or in addition to Portland cement or composite Portland cements.
In one embodiment, the method may further comprise the addition of one or more selected aggregates between steps b and c.
The aggregate may be selected from any conventional aggregate known to the skilled person.
A further aspect of the present invention provides concrete produced by a method according to a first aspect of the present invention.
A further aspect of the present invention provides concrete comprising cement and waste paper sludge.
A further aspect of the present invention provides mortar comprising cement and waste paper sludge.
Detailed Description of the Invention
An embodiment of the invention will now be described, by way of example only.
Production of concrete from waste recycled paper sluçge The following components were used in the production of concrete: paper sludge 56 % stabiliser 24 % (paper ash) cementitious material 30 % (Portland cement) water (15 litres of water to a 20kg mix of other constituents) Continuous mixing process 1. 50 % (7.5 litres) of the water was added to a concrete mixer for continuous mixing.
2. The recycled waste paper sludge (11.2 kg) was added to the mixer and mixed thoroughly with the water for several minutes to break down the paper sludge particles and produce a paper slurry with a pH value of between 7 and 8.
3. The stabiliser (4.8 kg) and the remaining water were then added to the mixer and the mixture mixed further to produce a slurry-type consistency.
4. After a mixing further for a few minutes the cementitious material (6 kg) was added to the mixture and mixed for a further few minutes. If necessary, additional water may be added to achieve the desired concrete consistency.
The additional water is added for the purposes of handling and cement flow.
However, it is the moisture content of the pressed concrete that is important. The target moisture content is 11 %, which typically corresponds to a water:cement ratio of 0.3. It is this water:cement ratio that governs the strength and handling properties of the resultant concrete.
S
Although aspects of the invention have been described with reference to the embodiment shown in the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiment shown and that various changes and modifications may be effected without further inventive skill and effort, for example, if the desired properties of the final concrete require the addition of specific aggregate, any required specific aggregate may be added after the stabiliser and before the cementitious material.
Furthermore, it is to be appreciated that, if required, the stabiliser may be added to the waste recycled paper sludge before the addition of water.
Concrete prepared in accordance with the present invention may be used on its own or as a low carbon economic back mix such as are used in the production of paving slabs to provide a base on which is supported higher quality, more expensive concrete is provided as the face mix.
Claims (14)
- CLAIMS1. A method of production of concrete, the method comprising the steps of: a. Providing waste paper sludge; an b. Adding a stabilising compound and hydrating fluid to the waste paper sludge, the stabilising compound having a pH value greater than 10; c. Adding aggregate; and d. Adding a cementitous material.
- 2. A method according to Claim 1, wherein the hydrating fluid is mixed with the waste paper sludge before the addition of the stabilising compound.
- 3. A method according to Claim 1, wherein the stabilising compound is mixed with the waste paper sludge before hydration.
- 4. A method according to any preceding Claim, wherein the stabilising compound has a pH greater than 12.
- 5. A method according to any preceding Claim, wherein the stabilising compound has a pH value of up to 13.
- 6. A method according to any preceding Claim, wherein the stabilising compound is selected from the group consisting of limestone, lime, blast furnace slag paper ash.
- 7. A method according to any preceding Claim, wherein the cementitious material comprises Portland cement or a composite Portland cement.
- 8. A method according to any preceding Claim, further comprising the addition of selected aggregate between steps b and c.
- 9. Concrete produced by a method according to any preceding Claim.
- 10. Concrete comprising cement and waste paper sludge.
- 11. Mortar comprising cement and waste paper sludge and aggregate.
- 12. A method substantially as hereinbefore described and with reference to the accompanying drawings.
- 13. Concrete substantially as hereinbefore described and with reference to the accompanying drawings.
- 14. Mortar substantially as hereinbefore described and with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0816055A GB2463310A (en) | 2008-09-03 | 2008-09-03 | A method of forming concrete containing waste paper sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0816055A GB2463310A (en) | 2008-09-03 | 2008-09-03 | A method of forming concrete containing waste paper sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0816055D0 GB0816055D0 (en) | 2008-10-08 |
| GB2463310A true GB2463310A (en) | 2010-03-17 |
Family
ID=39866200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0816055A Withdrawn GB2463310A (en) | 2008-09-03 | 2008-09-03 | A method of forming concrete containing waste paper sludge |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2463310A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29621251U1 (en) * | 1996-12-06 | 1997-02-13 | Uhl, Herbert, 77746 Schutterwald | Building material |
| KR100798893B1 (en) * | 2007-06-13 | 2008-01-29 | 권평곤 | Manufacturing method concrete products using sludge |
| CN101439947A (en) * | 2007-11-22 | 2009-05-27 | 黄志鹏 | Aerated concrete building block and manufacturing method thereof |
-
2008
- 2008-09-03 GB GB0816055A patent/GB2463310A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29621251U1 (en) * | 1996-12-06 | 1997-02-13 | Uhl, Herbert, 77746 Schutterwald | Building material |
| KR100798893B1 (en) * | 2007-06-13 | 2008-01-29 | 권평곤 | Manufacturing method concrete products using sludge |
| CN101439947A (en) * | 2007-11-22 | 2009-05-27 | 黄志鹏 | Aerated concrete building block and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0816055D0 (en) | 2008-10-08 |
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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) |