CN113845319A - Portland cement and preparation method thereof - Google Patents
Portland cement and preparation method thereof Download PDFInfo
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- CN113845319A CN113845319A CN202111220089.9A CN202111220089A CN113845319A CN 113845319 A CN113845319 A CN 113845319A CN 202111220089 A CN202111220089 A CN 202111220089A CN 113845319 A CN113845319 A CN 113845319A
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- 239000011398 Portland cement Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 57
- 239000004568 cement Substances 0.000 claims abstract description 54
- 239000002699 waste material Substances 0.000 claims abstract description 31
- 235000019738 Limestone Nutrition 0.000 claims abstract description 29
- 239000006028 limestone Substances 0.000 claims abstract description 29
- 239000004575 stone Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000010881 fly ash Substances 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 8
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 8
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 8
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 239000011575 calcium Substances 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- XGCDHPDIERKJPT-UHFFFAOYSA-N [F].[S] Chemical class [F].[S] XGCDHPDIERKJPT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000003469 silicate cement Substances 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 14
- 239000003795 chemical substances by application Substances 0.000 abstract description 7
- 238000000227 grinding Methods 0.000 abstract description 6
- 238000002156 mixing Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract 1
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Inorganic materials O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 abstract 1
- 239000000463 material Substances 0.000 description 13
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical group [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 12
- 239000010410 layer Substances 0.000 description 12
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 229910019142 PO4 Inorganic materials 0.000 description 6
- 235000021317 phosphate Nutrition 0.000 description 6
- 230000000979 retarding effect Effects 0.000 description 6
- 239000002910 solid waste Substances 0.000 description 6
- 229910052602 gypsum Inorganic materials 0.000 description 5
- 239000010440 gypsum Substances 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 4
- 239000010452 phosphate Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000010878 waste rock Substances 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 150000004760 silicates Chemical class 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000009614 chemical analysis method Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005065 mining Methods 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
- 239000002367 phosphate rock Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- 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
- C04B7/02—Portland cement
- C04B7/04—Portland cement using raw materials containing gypsum, i.e. processes of the Mueller-Kuehne type
-
- 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
- C04B7/02—Portland cement
- C04B7/06—Portland cement using alkaline raw 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
-
- 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
Abstract
The invention discloses a Portland cement and a preparation method thereof, wherein the formula and the preparation method of the Portland cement comprise the following components in percentage by mass: cement clinker, phosphogypsum, fly ash and limestone waste stone; the chemical components of the waste limestone are as follows: LOI, SiO2，Al2O3，Fe2O3CaO, MgO and water; the chemical components of the phosphogypsum are as follows: LOI, SiO2，Al2O3，Fe2O3，CaO，MgO，SO3And water; grinding the clinker, the phosphogypsum and the fly ash according to the proportion requirement; independently grinding the waste limestone and controlling the specific surface area of the ground waste limestone and waste limestone to be more than 500m2Per kg; two kinds of ground semi-finished productsAfter mixing, the specific surface area is more than or equal to 380m2A mixture of/kg; the mixture has 7-day linear expansion rate of 0.15% or more and 28-day linear expansion rate of less than 0.60%, and the setting time is 200-750 min; the crack of the pavement is eliminated, the service life of the pavement is prolonged, and the expanding agent is replaced to meet the requirements of various road constructions; realizing green development of industry.
Description
Technical Field
The invention relates to cement and a manufacturing method thereof, in particular to portland cement and a manufacturing method thereof.
Background
The road base layer plays the effect of holding up and down in the road surface structure, and the load stress that will transmit via the road surface spreads into the soil matrix to play the support road surface structure and keep its roughness, thereby guarantee the safety and the travelling comfort of driving a vehicle. The quality of the base layer mixed material has very important influence on the strength, the service performance and the durability of the whole pavement engineering, particularly the asphalt pavement, so that the pavement base layer material is required to have the performances of sufficient strength, stability, small shrinkage (thermal shrinkage and drying shrinkage) deformation, strong water resistance, freezing resistance and the like. There are many types of materials used as the base layer, and a semi-rigid material is an inorganic binder stabilizing material having rigidity intermediate between that of a flexible material and a rigid material by treating various aggregates or soils with an inorganic binder. The material has the advantages of large bearing capacity, high strength, good plate property and the like, and is widely applied to base layers and subbase layers of various pavements. Among them, cement stabilizing materials are one of the more widely used. The cement stabilizing material takes cement as a main cementing material, and aggregates are bonded by hydration and hardening of the cement, so that the cement has good mechanical property and plate body property, but the cement is easy to crack when the temperature and the humidity are changed, thereby influencing the stability of a surface layer. For example, the cement stabilized macadam is exposed to the defects of large shrinkage deformation, easy cracking and the like in the using process, and the cracks of the cement stabilized macadam base layer can form reflection cracks on the asphalt surface layer, so that the using performance of the asphalt pavement is seriously influenced. In order to improve the performance of cement stabilized macadam and reduce the shrinkage deformation of the macadam, an expanding agent is generally added to generate micro expansion in the process of concrete setting, so that pavement cracks are eliminated.
The comprehensive utilization rate of the phosphogypsum is low in China, the phosphogypsum is only treated as a dangerous solid waste, the proportion of the comprehensive utilization gypsum in the newly-added gypsum is increased from 16.67% in 2010 to 41.25% in 2016, the comprehensive utilization of the phosphogypsum is neglected due to abundant natural gypsum and desulfurized gypsum resources in China, and at present, the resource is increasingly deficient, how to make the phosphogypsum utilization work is realized, the sustainable development of solid waste in China is promoted, and the promotion of ecological civilization construction has a vital work.
Disclosure of Invention
The invention provides Portland cement and a preparation method thereof in order to solve the problems, wherein the formula and the preparation method of the Portland cement comprise the following components in percentage by mass:
58.5 to 65.5 percent of cement clinker, 2.5 to 6.5 percent of phosphogypsum, 15 to 25 percent of fly ash and 15 to 30 percent of limestone waste stone;
the chemical components of the limestone waste stone are as follows: LOI 27.76% -30.81%, SiO222.25％～25.25％， Al2O35.09％～7.25％，Fe2O33.13 to 4.25 percent of water, 32.95 to 37.95 percent of CaO32, 2.62 to 3.95 percent of MgO2 and 0.50 to 6.00 percent of water;
the phosphogypsum comprises the following chemical components: LOI 16.09% -19.80%, SiO28.14％～9.80％， Al2O32.35％～2.80％，Fe2O31.57％～1.98％，CaO29.26％～30.80％， MgO0.43％～1.48％，SO338.11% -43.82% and water 0.50% -6.00%;
the clinker, the phosphogypsum and the fly ash are ground according to the proportion requirement, and the SO in the silicate cement is controlled3The mass percentage is 1.8-4.5%, the specific surface area of the ground limestone waste stone is controlled to be more than 500m2/kg；
The clinker, the phosphogypsum and the fly ash are mixed according to a proportion to obtain a specific surface area of more than or equal to 380m2A mixture of/kg; the mixture has 7-day linear expansion rate not lower than 0.15% and 28-day linear expansion rate lower than 0.60%, and setting time 200-750 min.
Further, the Portland cement and the preparation method thereof comprise the following components in percentage by mass:
3.0 to 6.5 percent of phosphogypsum.
Further, the Portland cement and the preparation method thereof comprise the following components in percentage by mass:
3.5 to 5.5 percent of phosphogypsum.
Further, the volume weight of the phosphogypsum is 0.733g/cm3～0.88g/cm3。
Furthermore, the main component of the phosphogypsum is calcium sulfate dihydrate, and the mass percentage of the calcium sulfate dihydrate in the phosphogypsum is 70-90%. The minor components contained therein vary depending on the place of production of the phosphate ore, and generally contain phosphates and silicates of Ca and Mg as rock components.
Further, the calcium sulfate dihydrate is decomposed to form a compound containing Ca or Mg.
Furthermore, the phosphogypsum also contains organic phosphorus and sulfur fluorine compounds.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the silicate cement and the preparation method thereof, the developed cement has micro-expansion performance, the problem of shrinkage and deformation of the cement is solved by adding an expanding agent instead of a pavement construction, micro-expansion is generated in the cement coagulation process, the construction delay rolling time of a road base is greatly prolonged, the shrinkage and cracking of the base are compensated, and the construction of the road base is facilitated; the expansion agent is added to replace the pavement construction to solve the problem of shrinkage deformation, and the cement generates micro expansion in the condensation process, so that the pavement cracks are eliminated, the service life of the pavement is prolonged, the comfort of vehicle driving is improved, and the pavement cracks are eliminated.
2. The invention relates to a Portland cement and a preparation method thereof, wherein the developed retarded micro-expansion Portland cement 32.5 for a road base course has micro-expansion performance by adjusting the mixing amount of phosphogypsum and limestone waste stone, the 7-antenna expansion rate is more than or equal to 0.15 percent, the 28-antenna expansion rate is less than 0.60 percent, the setting time is adjusted according to the requirements of road engineering, can be controlled within 200 to 750 minutes, can replace an expanding agent, and meets the requirements of various road constructions.
3. The invention relates to portland cement and a manufacturing method thereof, which reasonably prepares materials and adjusts by using phosphogypsum, limestone waste stone and cement clinker to produce retarding micro-expansion portland cement for a road base course.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below.
Example (b):
the core of the invention is to provide a Portland cement and a preparation method thereof, and the formula and the preparation method of the Portland cement comprise the following components in percentage by mass:
58.5 to 65.5 percent of cement clinker, 2.5 to 6.5 percent of phosphogypsum, 15 to 25 percent of fly ash and 15 to 30 percent of limestone waste stone;
the chemical components of the limestone waste stone are as follows: LOI 27.76% -30.81%, SiO222.25％～25.25％， Al2O35.09％～7.25％，Fe2O33.13 to 4.25 percent of water, 32.95 to 37.95 percent of CaO32, 2.62 to 3.95 percent of MgO2 and 0.50 to 6.00 percent of water;
the phosphogypsum comprises the following chemical components: LOI 16.09% -19.80%, SiO28.14％～9.80％， Al2O32.35％～2.80％，Fe2O31.57％～1.98％，CaO29.26％～30.80％， MgO0.43％～1.48％，SO338.11% -43.82% and water 0.50% -6.00%;
grinding the clinker, the phosphogypsum and the fly ash according to the proportion requirement, and controlling SO in the portland cement3The mass percentage is 1.8 percent to 4.5 percent, and the specific surface area of the pulverized limestone waste stone powder is controlled to be more than 500m2/kg；
The specific surface area of the clinker, the phosphogypsum and the fly ash after being mixed according to the proportion is more than or equal to 380m2A mixture of/kg; the mixture has 7-day linear expansion rate not lower than 0.15% and 28-day linear expansion rate lower than 0.60%, and setting time 200-750 min.
Specifically, the Portland cement and the preparation method thereof comprise the following components in percentage by mass:
3.0 to 6.5 percent of phosphogypsum.
Specifically, the Portland cement and the preparation method thereof comprise the following components in percentage by mass:
3.5 to 5.5 percent of phosphogypsum.
Specifically, the volume weight of the phosphogypsum is 0.733g/cm3～0.88g/cm3。
Specifically, the main component of the phosphogypsum is calcium sulfate dihydrate, and the mass percentage of the calcium sulfate dihydrate in the phosphogypsum is 70-90%. The minor components contained therein vary depending on the place of production of the phosphate ore, and generally contain phosphates and silicates of Ca and Mg as rock components.
Specifically, calcium sulfate dihydrate decomposes to form a compound containing Ca or Mg.
In particular, the phosphogypsum also contains organic phosphorus and sulfur fluorine compounds.
Phosphogypsum: the method refers to solid waste residue generated when phosphorite is treated by sulfuric acid in phosphoric acid production, and the main component of the solid waste residue is calcium sulfate. The phosphogypsum comprises the following main components: CaSO4·2H2O, and in addition, various other impurities. The phosphogypsum is powder, has the appearance of grey white, yellow and light green, and also contains organic phosphorus and sulfur fluorine compounds, and the volume weight is 0.733 to 0.88g/cm3The particle diameter is generally 5-15 um, the main component is calcium sulfate dihydrate, the content of the calcium sulfate dihydrate can reach about 70-90%, the secondary components contained in the calcium sulfate dihydrate are different according to different production places of phosphate ore, and the calcium sulfate dihydrate generally contains phosphate and silicate of rock components Ca and Mg.
The waste limestone is from the stripped matter after the mining of limestone mine, because of containing a large amount of harmful components, the use condition can not be met, a large amount of waste limestone is piled in a waste slag field, a large amount of soil is damaged, the waste of resources is caused, and the construction of green mine is not facilitated.
The developed retarded micro-expansion silicate 32.5 cement for the road base course has the micro-expansion performance by adjusting the mixing amount of the phosphogypsum and the limestone waste stone, the 7-antenna expansion rate is more than or equal to 0.15 percent, the 28-antenna expansion rate is less than 0.60 percent, the setting time is adjusted according to the requirements of road engineering, can be controlled within 200 to 750 minutes, can replace an expanding agent, and is suitable for the requirements of various road constructions.
The phosphogypsum, the limestone waste stone and the cement clinker are reasonably proportioned and adjusted to produce the retarded micro-expansion portland cement for the road base, and by the technology, a large amount of phosphogypsum and limestone waste stone are consumed to achieve the comprehensive utilization of waste residues, so that the green development concept is realized.
The main components of the phosphogypsum and the limestone waste rock are as follows:
description of specific technical scheme and key technical points
The slow-setting micro-expansion portland cement for the road base layer has 32.5-grade components as follows:
wherein the mixing amount of the phosphogypsum is controlled to be 2.5 to 6.5 percent, and SO is contained in the cement3The linear expansion coefficient is controlled to be 1.8-4.5 percent and meets the quality requirement.
(II) 32.5-grade technical requirements of the retarding micro-expansion portland cement for the road base layer are as follows:
and (III) determining a batching scheme for testing according to the technical index requirements of the phosphogypsum, the limestone waste rock and the retarded micro-expansion portland cement for the road base course of 32.5, and determining a production scheme for producing the cement through the test.
1. The production scheme of the limestone waste stone comprises the following steps:
the limestone and the waste stone are required to be independently ground, and the specific surface area of the ground limestone and waste stone is controlled to be 500m2More than kg, and is independently added into the cement according to the proportion required by the cement ingredients.
2. The cement proportion and the grinding control indexes thereof are as follows:
the specific implementation scheme is as follows: grinding the clinker, the phosphogypsum and the fly ash according to the proportion requirement, and controlling SO in the cement3Content, specific surface area control, ground cement and specific surface area 500m2And mixing the waste limestone/kg in proportion to finally reach the required control index.
3. Chemical analysis test results
The slow setting micro-expansion silicate 32.5 cement for the road base layer is used for carrying out linear expansion rate inspection on the tested cement according to building material industry standard JC/T313-2009 expansion rate test method for expanded cement.
The water consumption, setting time and mortar strength of the retarded micro-expansion silicate 32.5 cement for road base course are tested according to GB/T1346-2011 test method for water consumption, setting time and stability of standard consistency of cement and GB/T17671-1999 test method for mortar strength (ISO method).
The chemical components of the retarded micro-expansion silicate 32.5 cement for the road base layer are tested according to GB/T176-2018 Cement chemical analysis method.
The stability of the cement is all qualified.
4. Strength condition of cement
The data comparison shows that the doping amount of the phosphogypsum is adjusted to be between 3.0 and 6.5 percent, the doping amount of the limestone and the waste rock is adjusted to be between 15.0 and 30.0 percent, the linear expansion rate of the cement can be adjusted according to the requirements of road construction, and the quality index required by the retarded micro-expansion silicate 32.5 cement for a road base layer can be met.
Second, description of specific implementation of industrialized production
Silicate clinker and mixed materials are used, limestone waste stone and fly ash of the factory are used, the raw materials are all stored independently, an independent batching and metering scale is arranged below a warehouse for batching and metering, a stacking shed is independently stored by using a byproduct phosphogypsum, the phosphogypsum is provided with a special feeding port, and an independent metering scale is arranged at the stacking shed for metering and metering. The production process is characterized in that a roller press and a cement mill are combined to form a closed circuit grinding system for production, finished products enter six independent cement storage bins with six thousand tons of storage capacity through conveying systems respectively, an air homogenizing system is installed at the bottom of each storage bin for cement homogenization, the homogenized cement finished products are conveyed into an independent cement steel plate bin for bulk loading or bagged delivery, and a production process control system is used for centralized control production through a DCS (distributed control system) of a central control room.
The following batching scheme is implemented for industrial production, and the data inspection result is as follows:
table-cement batching scheme
Chemical analysis of industrial production and examination of setting time and linear expansion rate
Cement strength conditions of Table III
After the cement product is industrialized, tests are carried out, the uniform and stable product quality is achieved, the requirements of road construction customers on the retarded micro-expansion silicate 32.5 cement for the road base are met, and the customer-consistent approval is obtained.
The protection of the ecological environment is the future generations of benefits, particularly solid wastes such as limestone waste stone stripped from mines, waste phosphogypsum and the like, which cause great environmental risks and potential safety hazards, and the application of the solid wastes to cement production is the green development of the enterprise to be practiced and the high-quality development of the enterprise to be practiced.
The developed retarding micro-expansion silicate 32.5 cement for the road base has micro-expansion performance, belongs to special stable cement for the road base, has the retarding micro-expansion characteristic, greatly prolongs the construction delay rolling time of the road base, compensates the shrinkage cracking of the base, and is favorable for the construction of the road base. The expansion agent is added to replace the pavement construction to solve the problem of shrinkage deformation, and the cement generates micro expansion in the condensation process, so that pavement cracks are eliminated, the service life of the pavement is prolonged, and the comfort of vehicle running is improved.
The preparation method of the road base retarding micro-expansion cement is simple and easy for industrial production.
The setting time and the expansion rate of the road base retarding micro-expansion cement are increased along with the increase of the mixing amount of the phosphogypsum, and the initial setting time and the final setting time of the limestone waste rock are respectively shortened by 27min and 42 min.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements that have been described above and that various modifications and changes may be made without departing from the scope thereof. The above embodiments of the present application do not limit the scope of the present application.
Claims (7)
1. The Portland cement is characterized in that the formula and the preparation method of the Portland cement comprise the following components in percentage by mass:
58.5 to 65.5 percent of cement clinker, 2.5 to 6.5 percent of phosphogypsum, 15 to 25 percent of fly ash and 15 to 30 percent of limestone waste stone;
the chemical components of the limestone waste stone are as follows: LOI 27.76% -30.81%, SiO222.25％～25.25％，Al2O35.09％～7.25％，Fe2O33.13 to 4.25 percent of water, 32.95 to 37.95 percent of CaO32, 2.62 to 3.95 percent of MgO2 and 0.50 to 6.00 percent of water;
the phosphogypsum comprises the following chemical components: LOI 16.09% -19.80%, SiO28.14％～9.80％，Al2O32.35％～2.80％，Fe2O31.57％～1.98％，CaO29.26％～30.80％，MgO0.43％～1.48％，SO338.11% -43.82% and water 0.50% -6.00%;
the clinker, the phosphogypsum and the fly ash are ground according to the proportion requirement, and the SO in the silicate cement is controlled3The mass percentage is 1.8-4.5%, the specific surface area of the ground limestone waste stone is controlled to be more than 500m2/kg；
The clinker, the phosphogypsum and the fly ash are mixed according to a proportion to obtain a specific surface area of more than or equal to 380m2A mixture of/kg; the mixture has 7-day linear expansion rate not lower than 0.15% and 28-day linear expansion rate lower than 0.60%, and setting time 200-750 min.
2. The portland cement and the manufacturing method thereof according to claim 1, wherein the portland cement and the manufacturing method thereof comprise the following components by mass percent:
3.0 to 6.5 percent of phosphogypsum.
3. The portland cement and the manufacturing method thereof according to claim 2, wherein the portland cement and the manufacturing method thereof comprise the following components by mass percent:
3.5 to 5.5 percent of phosphogypsum.
4. A portland cement according to claim 1 and its manufacturing method, wherein the volume weight of phosphogypsum is 0.733g/cm3～0.88g/cm3。
5. The portland cement according to claim 1, wherein the main component of the phosphogypsum is calcium sulfate dihydrate, and the mass percentage of the calcium sulfate dihydrate in the phosphogypsum is 70-90%.
6. The portland cement and its manufacturing method according to claim 5, wherein the calcium sulfate dihydrate forms a compound containing Ca or Mg after decomposition.
7. A Portland cement and its preparation method as claimed in claim 6, characterized by that, the phosphogypsum also contains organic phosphorus and sulfur fluorine compounds.
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