WO2015021700A1 - 废弃混凝土作为水泥掺合材的方法以及由此得到的水泥 - Google Patents
废弃混凝土作为水泥掺合材的方法以及由此得到的水泥 Download PDFInfo
- Publication number
- WO2015021700A1 WO2015021700A1 PCT/CN2013/087173 CN2013087173W WO2015021700A1 WO 2015021700 A1 WO2015021700 A1 WO 2015021700A1 CN 2013087173 W CN2013087173 W CN 2013087173W WO 2015021700 A1 WO2015021700 A1 WO 2015021700A1
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- Prior art keywords
- clinker
- cement
- average
- waste concrete
- mpa
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Definitions
- the present invention relates to the field of cement production, and in particular to a method of using waste concrete as an active composite material in cement production and cement obtained thereby. Background technique
- cement as one of the largest building materials, in order to reduce its production cost or improve certain properties, usually a certain amount of ⁇ , that is, cement is usually ⁇ ffl clinker, ⁇ , gypsum clinker batching system ingredients After grinding the mixture.
- Commonly used reactive blends are water-quenched slag, followed by phosphorus slag, steel slag, cinder, fly ash and other metallurgical waste. Depending on the type of cement and the strength grade, the blend usually accounts for 5-50%. In order to reduce production costs, the amount of admixture used by some cement manufacturers is as high as 60-80%.
- the basic composition of concrete materials is hydrated cement stone (ie, product after cement hydration) and aggregate (also known as aggregate, fine aggregate and coarse aggregate).
- the aggregate is usually silica sand or gravel, a small amount is expanded pearlite ceramsite, and the crushed stone is mostly broken carbonate rock or limestone.
- the technical problem to be solved by the present invention is to provide a method which can be used in a large amount of waste concrete as an active admixture in cement production, which is simple and easy to operate, has no investment pressure, is economical, and is widely accepted.
- the invention provides a method for preparing cement mixed clinker by using waste concrete as a blending material, which comprises: - i) crushing waste concrete into a granular material having a particle diameter of 40 mm;
- step i) adding the granulated material obtained in step i) to the cement production equipment and mixing with the clinker in the production equipment, and the waste heat of the clinker is used to activate the granulated material, and is activated by the waste heat of clinker.
- the waste concrete is mixed in the clinker directly as a kneaded material to obtain the cement mixed clinker.
- the cement production apparatus includes a rotary kiln and a grate cooler connected to the rotary kiln, the rotary kiln is provided with a kiln cooling belt, and the rotary kiln includes a kiln head And the clinker dropping port; adding the granulated material obtained in the step D to at least one of the kiln cooling zone of the rotary kiln, the clinker dropping port and the crucible cooling, so that the residual heat of the clinker prepared in the rotary kiln is directly used
- the granular waste concrete is heat-activated, and the waste concrete activated by the clinker waste heat treatment is mixed as a blending material in the clinker in the clinker, and the cement mixed clinker is produced.
- the granulated material is added in an amount of from 1 to 30% by weight based on the weight of the clinker fired in the rotary kiln.
- the granulated material is added in an amount of from 5 to 20% by weight based on the weight of the raw clinker fired in the rotary kiln.
- the waste concrete is crushed to a granule having a particle size of 3 ⁇ 4 ⁇ 20 mm, preferably a granule having a particle size of 15 mm, more preferably a granule having a particle diameter of 12 mm.
- the waste concrete is at least one selected from the group consisting of road and bridge, industrial and civil construction waste concrete, waste brick, waste mortar, and waste aerated concrete.
- a general crushing or crushing and screening device is used; the addition of the waste concrete is carried out by using general equipment and a conventional method.
- the invention also provides a cement comprising the cement clinker prepared by the above method.
- the cement has a standard consistency of 32.5 cement of 22.5-25.5%, an average initial setting time of 109-154 ⁇ , and an average final setting time of 151-203 min.
- the cement has a 3-day average compressive strength of 15.6-29.8 MPa, a 3-day average flexural strength of 1.7-3.2 MPa, a 28-day average compressive strength of 35.3-58.1 MPa, and 28 days.
- the average flexural strength is
- the piercing of concrete is cement and sand (aggregate). It is formed by adding water and hydration.
- the basic material composition of waste concrete is the characteristics of cement stone and aggregate. It uses cement mineral calcium silicate, calcium aluminate, iron aluminum. Calcium acid, calcium sulphoaluminate, calcium oxide, etc., hydrated to form hydrated gelling minerals to form cement stone, and cementitious mineral hydrated calcium silicate, hydrated calcium aluminate, hydrated calcium ferrite, hydrated sulphoaluminate
- the water-bearing minerals such as calcium and calcium hydroxide can be dehydrated to an unsteady state (indeterminate form and metastable sub-crystalline state) after heat treatment, and have hydration activity characteristics.
- the high-temperature clinker is used to cool the residual heat to directly heat-activate the cement stone;
- aggregate heat treatment in waste concrete can increase the activity.
- heat treatment of inert aggregates such as silica sand, vermiculite and granite commonly used in aggregates can produce cracks in turtles and exhibit certain activities.
- the heat treatment can partially or completely decompose the highly active calcium oxide, and even the heat treatment of the clay entrained in the waste concrete pellet can also decompose the active silica, the trialumina, etc., and directly heat treat the waste concrete with the high temperature clinker waste heat to achieve recovery.
- the admixture can be mixed with the clinker after a certain ratio of feed and then mixed into the warehouse, without affecting the quality stability of the cement.
- the waste concrete is cooled in the kiln head high temperature clinker to the high temperature zone of the grate cooler. The section is added to the high temperature clinker.
- the waste concrete in the high temperature clinker is added to the waste concrete.
- the high activity of CaO produced by the decomposition of calcium carbonate can effectively increase the initial alkalinity of the cement and improve the workability of the cement.
- the undecomposed part of the calcium carbonate particles or the crystalline silicon particles do not affect the clinker strength in a suitable amount.
- the hydrated minerals in the cement stone in the waste concrete constituent material are dehydrated to form a hydraulically active regenerated cement mineral, which is equivalent to increasing the total output of clinker minerals and reducing the energy consumption of the total clinker;
- the invention develops waste concrete into a high-quality admixture in a very economical manner, which can be solved to some extent.
- the shortage and cost of the blending materials are conducive to inhibiting the intensive use of inferior blending materials in cement grinding, especially raw shale, raw vermiculite, clay minerals, etc., reducing the occurrence of some inferior cement and reducing the occurrence of bean curd engineering.
- the waste concrete discarded in the ravine is crushed into waste concrete having a particle size of 3 ⁇ 4 ⁇ 10 mm by using an aluminum phosphate-lined alumina ceramic guide trough for nickel-chromium steel, and is sent to the kiln cooling zone from the kiln head, and the waste concrete is fed.
- the amount is 8'1 ⁇ 2 of the weight of the original clinker, and the cement mixed clinker containing the waste concrete admixture is prepared: standard consistency
- the amount of cement of 32.5 grade is 45%, the standard consistency of cement is 24.3-25.5%, the average initial condensation is i85min, the average final condensation is 243min, 3 days.
- the average compressive strength is i5.6MPa, the average flexural strength is L7MPa, the 28-day average compressive strength is 35.3MPa, and the average flexural strength is 3.6MPa.
- the cement has poor construction performance (no pulp, segregation, bleeding), especially paving The surface layer is severely sanded.
- the waste concrete repaired in the vicinity of the plant area is broken into the waste material of the waste concrete kiln head with the particle size ⁇ ⁇ 10 ⁇ , and the waste concrete feed amount is 15% of the weight of the original clinker.
- Cement mixed clinker containing waste concrete admixture Standard consistency 23.5-24.8%, initial setting time li lmin -134mm, average initial setting time 123min, final setting time 162rain- 197min, average final setting time 173min ?
- the 3-day average compressive strength is 29.3 MPa
- the average flexural strength is 3.2 MPa
- the 28-day average compressive strength is 56.7 MPa
- the average flexural strength is 5.7 MPa .
- the cement mixed clinker has no change in strength compared with the original clinker.
- the standard consistency of 32.5 cement is 23.8-24.7%
- the average initial setting time is 173min
- the average final setting time is 223min
- the average is 3 days.
- the compressive strength is 19.3 MPa
- the average flexural strength is 2.1 MPa
- the 28-day average compressive strength is 39. iMPa
- the average flexural strength is 4.1 MPa.
- the cement construction workability is obviously good, that is, mixing and grinding, no segregation, and the bleeding rate is reduced by 85%. Basically, there is no serious sanding phenomenon caused by the original cement.
- cement admixture dosage is 45%
- cement standard consistency is 24.2-25.3%
- average initial setting time is 157min
- average final setting time is 216niin
- 3-day average compressive strength is 17.5MPa
- average flexural strength is 1.9MPa
- 28-day average The compressive strength is 35.6 MPa and the average flexural strength is 3.5 MPa.
- the cement has poor construction performance (severe segregation and bleeding), especially the surface of the concrete pavement is severely sanded, and the plastering is severely cracked.
- the construction waste containing waste concrete, waste brick, aerated concrete, etc. which is disposed on the slope of the hillside, is broken into the waste concrete containing waste concrete having a particle size of 10 mm from the clinker in the kiln head cover.
- Material The addition of construction waste containing waste concrete is 7'1 ⁇ 2 of the weight of the original clinker.
- the cement mixed clinker containing the waste concrete admixture is prepared: standard consistency 22.5- 24.3%, initial setting time 91mii - 129min , average initial setting time HOmin, final setting time 145mhi- 173min, average final setting time 157min, 3-day average compressive strength 28,6MPa, average flexural strength 3.0MPa, 28-day average compressive strength 58.7MPa, average flexural strength 5.7 MPa, that is, the obtained cement mixed clinker has no change in strength compared with the original clinker.
- the standard consistency of the 32.5 cement is 23.8-24.3%
- the average initial setting time is 143min
- the average final setting time is 203min
- the average is 3 days.
- the compressive strength is 19.1 MPa
- the average flexural strength is 2.3 MPa
- the 28-day average compressive strength is 39. MPa
- the average flexural strength is 3.9 MPa.
- the cement construction workability is obviously good, that is, mixing and grinding, no segregation, and the bleeding rate is reduced by 85%. Basically, there is no serious sanding and cracking phenomenon caused by the original cement.
- the original blend of the plant is made of cinder, pebbles and slag in a ratio of 2:1:2, and gypsum is taken as a 3 ⁇ 4 desulfurized gypsum.
- the 32.5 grade cement admixture is 48%, the cement standard consistency is 23.2-24.5%, the average initial setting is 147miii, the average final setting time is 2i5mm, the 3-day average compressive strength is 21.6MPa, the average flexural strength is 2.3MPa, and the average is 28 days.
- the compressive strength is 40, 3 MPa, and the average flexural strength is 3.9 MPa.
- the cement has poor construction performance (severe bleeding, segregation), especially on the concrete surface of the pavement.
- the waste concrete for roadway repairing is broken into waste concrete with a diameter of 12 mm and fed from the hopper head clinker feeding port, and the waste concrete feeding amount is 12% of the weight of the original clinker, and the obtained content is included.
- Cement mixed clinker of waste concrete admixture standard consistency 22,6-24,5%, initial setting time 89min- 121nii average initial setting time 109min, final setting time 140min- 161niin, average final setting time 152nihi, 3 days average Compressive strength 31,5MPa, average flexural strength 3,3M:Pa, 28-day average compressive strength 57,4MPa, average flexural strength 5,7MPa, that is, the obtained cement mixed clinker is stronger than the original clinker. no change.
- the standard consistency of 32.5 cement is 22.6-23.7%
- the average initial setting time is 133min
- the average final setting is 201min
- the average compressive strength of 3 days is 22.6.
- the cement construction workability is obviously good, that is, mixing using pulping, not easy to isolate, bleeding rate A 90% reduction has basically eliminated the serious sanding of the pavement concrete produced by the original cement.
- Example 5 3,5 X 48m dry rotary kiln production line of a factory.
- the standard consistency of its (primary) clinker was 23,1 -24,3%
- the initial setting time was 131mm-153rmn
- the average initial setting time was 143min.
- the clotting time was 186 min-219 min
- the average final setting time was 208 min.
- the average compressive strength of three days 30.1MPa, the average flexural strength 3.2MPa? 28 - day average compressive strength 58.5MPa, the average flexural strength of 6, l MPa.
- the original blended material of the plant is coal shale, burnt shale and slag according to 1:2:1, gypsum mining]3 ⁇ 4 natural dihydrate gypsum.
- the amount of cement of 32.5 grade is 50%, the standard consistency of cement is 24.3-25.5%, the average initial setting time is i87mm, the average final condensation is 243mi, the average compressive strength of 3 days is 17. iMPa, the average flexural strength is L9MPa, 28 days average The compressive strength is 35.6 MPa and the average flexural strength is 3.6 ⁇ 3 ⁇ 4.
- the cement has poor construction performance (severe bleeding, segregation), especially in the paving surface, the surface sanding is serious, and even the surface layer has no strength.
- the waste concrete abandoned in the vicinity of the plant area is broken into waste concrete with a particle size of i0mm
- the waste concrete with the particle size of i0mm is fed from the blanking port of the kiln head cover, and the waste concrete is fed in an amount of 20% of the original clinker.
- Cement mixed clinker with waste concrete admixture standard consistency 23.5-24.5%, initial setting time 125min- 147min, average initial setting time 131min, final setting time ⁇ 73min- 196nii average final setting time 181min, 3 days average resistance
- the compressive strength is 29.8 MPa
- the average flexural strength is 3.2 MPa
- the 28-day average compressive strength is 58.1 MPa
- the average flexural strength is 6.1 MPa. That is, the strength of the mixed clinker is not changed compared with the original clinker.
- the standard consistency of 32.5 cement is 23.6-24.7%
- the average initial setting is 59miii
- the average final setting time is 2i8mm
- the average is 3 days.
- the compressive strength is 21.7 MPa
- the average flexural strength is 2.3 MPa
- the 28-day average compressive strength is 39.6 MPa
- the average flexural strength is 4. iMPa.
- the cement construction workability is obviously good, that is, the pulping during the mixing process is not easy to isolate, and the bleeding rate is reduced by 90%. Basically, the surface of the original cement is severely sanded and the surface layer is not strong.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
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US14/377,647 US20150053118A1 (en) | 2013-08-13 | 2013-11-14 | Method for using waste concrete as blending material in cement production and cement thus obtained |
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CN201310349041.7A CN103396020B (zh) | 2013-08-13 | 2013-08-13 | 一种废弃混凝土作为水泥生产中的活性掺合材的方法 |
CN201310349041.7 | 2013-08-13 |
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- 2013-11-14 US US14/377,647 patent/US20150053118A1/en not_active Abandoned
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CN115432981A (zh) * | 2022-07-12 | 2022-12-06 | 淮阴工学院 | 一种碱渣-固废混凝土制备矸石基胶结充填材料的方法 |
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US20150053118A1 (en) | 2015-02-26 |
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