CN113277757A - High-speed roadbed cement and application method thereof - Google Patents
High-speed roadbed cement and application method thereof Download PDFInfo
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- CN113277757A CN113277757A CN202110728852.2A CN202110728852A CN113277757A CN 113277757 A CN113277757 A CN 113277757A CN 202110728852 A CN202110728852 A CN 202110728852A CN 113277757 A CN113277757 A CN 113277757A
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- 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
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
-
- 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
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
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- 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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/09—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/09—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges
- E01C23/0906—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for forming, opening-out, cleaning, drying or heating cuts, grooves, recesses or, excluding forming, cracks, e.g. cleaning by sand-blasting or air-jet ; for trimming paving edges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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 high-speed roadbed cement and an application method thereof, wherein the high-speed roadbed cement comprises the following raw material components in parts by weight: 50-70 parts of cement clinker, 15-25 parts of blast furnace slag, 5-10 parts of modified phosphogypsum, 5-7 parts of dry fly ash, 5-8 parts of a mixed retarder and 2-4 parts of nano montmorillonite, wherein the mixed retarder is organic carboxylate and inorganic zinc salt, and the inorganic zinc salt comprises zinc chloride, zinc sulfate and zinc carbonate.
Description
Technical Field
The invention relates to the technical field of high-speed roadbed cement, in particular to high-speed roadbed cement and an application method thereof.
Background
The cement is made up by using limestone and clay as main raw materials, through the processes of crushing, proportioning and grinding, and then feeding them into cement kiln, calcining to obtain clinker, adding proper quantity of gypsum and sometimes mixing material or additive, and grinding.
The highway is a modern sign and is a reflection of national comprehensive national force, the construction and operation of the highway relate to various aspects of national economy and social life, a large amount of cement is used as a raw material for the construction of the highway, and a large amount of cement is also used as a construction foundation for the construction of a highway subgrade.
The cement used for constructing the existing high-speed roadbed has good coagulability, and for large-area cement laying, if the cement coagulation speed is high, the cement coagulation speed is not beneficial to the paving and finishing work of the roadbed cement by workers, if the cement coagulation is too high, the labor intensity of the workers must be increased, the roadbed cement is not treated timely, and the formed high-speed roadbed is not smooth.
Disclosure of Invention
The invention aims to provide high-speed roadbed cement and an application method thereof, and solves the problems that cement used for constructing the existing high-speed roadbed has good coagulability, the paving and finishing work of roadbed cement by workers is not facilitated if the cement is solidified at a high speed for large-area cement paving, the labor intensity of the workers must be increased if the cement is solidified too fast, the roadbed cement is not treated timely, and the formed high-speed roadbed is not smooth.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
the invention provides high-speed roadbed cement which comprises the following raw material components in parts by weight:
50-70 parts of cement clinker, 15-25 parts of blast furnace slag, 5-10 parts of modified phosphogypsum, 5-7 parts of dry fly ash, 5-8 parts of mixed retarder and 2-4 parts of nano montmorillonite.
As a preferable scheme of the invention, the mixing retarder comprises the following raw material components in parts by weight:
4-8 parts of organic carboxylate and 5-7 parts of inorganic zinc salt, wherein the inorganic zinc salt comprises 6-9 parts of zinc chloride, 4-4.5 parts of zinc sulfate and 2-3 parts of zinc carbonate, and the mass ratio of the zinc chloride to the zinc sulfate to the zinc carbonate is 3: 2: 1.
as a preferable scheme of the invention, the cement clinker comprises the following components in percentage by mass: 80-95 parts of portland cement clinker, 8-20 parts of mineral raw materials, 3-9 parts of iron raw materials and 1-3 parts of desulfurized gypsum, wherein the mineral raw materials comprise, by mass, 1-3 parts of tricalcium silicate, 2-5 parts of dicalcium silicate, 2-4 parts of tricalcium aluminate and 5-8 parts of tetracalcium aluminoferrite.
As a preferable embodiment of the present invention, the method for preparing the high-speed roadbed cement according to any one of claims 1 to 3 comprises the steps of:
s1, respectively crushing the raw material components, and removing screen residue with the diameter of more than 250 mu m through a screen;
s2, adding the raw material components into a stirrer according to the mass ratio, and uniformly mixing to obtain initial mixed raw material powder;
s3, conveying the initial mixed raw material powder to a primary decomposition kiln, carrying out preheating decomposition in a heater, then calcining at high temperature in the rotary kiln, and cooling by a grate cooler to obtain a cement clinker crude product;
and S4, grinding the cement clinker crude product for multiple times by using a roller press, a ball mill and a high-efficiency powder concentrator to obtain a high-speed roadbed cement finished product.
As a preferable scheme of the present invention, in the step S1, the modified phosphogypsum is ground, cement clinker, blast furnace slag and dry fly ash are mixed and ground, and a mixed retarder and nano-montmorillonite are mixed and ground.
As a preferred embodiment of the present invention, in step S4, the cement clinker crude product is sent to a roller press, subjected to rolling treatment by the roller press, sent to a ball mill, subjected to milling treatment by the ball mill, then sent to a high-efficiency powder selecting machine, subjected to powder selection by the high-efficiency powder selecting machine, and subjected to removal of the powder particles with the excessive size, so as to obtain cement clinker crude product powder, wherein the removed large-size powder particles are subjected to rolling, milling and sorting treatment again.
In a preferable embodiment of the present invention, when the cement clinker crude product is ground by a ball mill, a polycarboxylic acid high-performance water reducing agent is added to the cement clinker crude product for mixing and grinding, wherein the content of the polycarboxylic acid high-performance water reducing agent is 1-2% of the weight of the cement raw material.
As a preferred embodiment of the present invention, a method for applying a high speed roadbed cement according to claim 1 comprises the steps of:
s5, flattening and cleaning a road base surface to be paved, paving a tied steel frame, and fixing the steel frame with the ground;
s6, calculating the use amounts of the cement, the stones, the sand and the purified water of the high-speed roadbed according to the area and the thickness of the high-speed roadbed area to be paved, mixing and stirring the calculated use amounts of the stones, the sand and the purified water with the cement of the high-speed roadbed for more than 5 minutes to obtain paving mixed concrete;
and S7, calculating and adding the consumption of the mixed concrete by adopting the paved mixed concrete obtained in the S6 to obtain paved finished product mixed concrete, and building the paved finished product mixed concrete on the highway subgrade.
As a preferable aspect of the present invention, the flattening of the road surface in S5 includes the steps of:
s501, filling soil in the roadbed surface, and repairing the hollow to obtain an initial roadbed surface;
s502, paving lime on the initial roadbed surface to enhance the hardness of the roadbed surface and obtain a restored roadbed surface;
s503, cleaning and flattening the restored roadbed surface to obtain the roadbed surface to be paved.
As a preferable aspect of the present invention, in S7, in the concrete process of laying the finished mixed concrete on the road surface, different laying methods are adopted according to the thickness of the road surface in different laying areas:
when the thickness of the pavement of the area to be paved is less than 4cm, paving the pavement by adopting the paving mixed concrete;
when the thickness of the pavement of the area to be paved is larger than 4cm, pouring a layer of paving mixed concrete with the thickness of 1cm on the substrate layer, then spreading a layer of sand, immersing the sand in the paving mixed concrete, wherein the sand layer is 1cm lower than the original pavement, and then pouring the paving mixed concrete, wherein the particle size of the sand is 30-60 mm.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the mixed retarder capable of prolonging the cement solidification rate is added in the cement preparation process, and under the action of the mixed retarder, the coagulation rate among the internal components of the cement is properly reduced in the use process after the cement is prepared and formed, so that when workers lay the cement on the highway subgrade, the workers can have enough time to carry out the work of timely paving and finishing the cement laid on the highway subgrade surface, the surface of the cement laid on the subgrade surface is more level and tidy after solidification, and the cement laying quality of the highway subgrade surface is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The high-speed roadbed cement comprises the following raw material components in parts by weight: 50-70 parts of cement clinker, 15-25 parts of blast furnace slag, 5-10 parts of modified phosphogypsum, 5-7 parts of dry fly ash, 5-8 parts of mixed retarder and 2-4 parts of nano montmorillonite. The mixed retarder comprises the following raw material components in parts by weight: 4-8 parts of organic carboxylate and 5-7 parts of inorganic zinc salt, wherein the inorganic zinc salt comprises 6-9 parts of zinc chloride, 4-4.5 parts of zinc sulfate and 2-3 parts of zinc carbonate, and the mass ratio of the zinc chloride to the zinc sulfate to the zinc carbonate is 3: 2: 1. the cement clinker comprises the following components in parts by mass: 80-95 parts of portland cement clinker, 8-20 parts of mineral raw materials, 3-9 parts of iron raw materials and 1-3 parts of desulfurized gypsum. The mineral raw materials comprise, by mass, 1-3 parts of tricalcium silicate, 2-5 parts of dicalcium silicate, 2-4 parts of tricalcium aluminate and 5-8 parts of tetracalcium aluminoferrite.
The preparation method of the high-speed roadbed cement comprises the following steps:
s1, respectively crushing the raw material components, and removing screen residue with the diameter of more than 250 mu m through a screen;
s2, adding the raw material components into a stirrer according to the mass ratio, and uniformly mixing to obtain initial mixed raw material powder;
s3, conveying the initial mixed raw material powder to a primary decomposition kiln, carrying out preheating decomposition in a heater, then calcining at high temperature in the rotary kiln, and cooling by a grate cooler to obtain a cement clinker crude product;
and S4, grinding the cement clinker crude product for multiple times by using a roller press, a ball mill and a high-efficiency powder concentrator to obtain a high-speed roadbed cement finished product.
Preferably, the modified phosphogypsum is ground, cement clinker, blast furnace slag and dry fly ash are mixed and ground, a mixed retarder and nano-montmorillonite are mixed and ground, in the step S4, the cement clinker crude product is sent into a roller press, subjected to rolling treatment by the roller press, sent into a ball mill, subjected to grinding treatment by the ball mill, then sent into a high-efficiency powder selecting machine, sorted by the high-efficiency powder selecting machine, removed from the powder particles with overlarge size to obtain cement clinker crude product powder, wherein the removed large-size powder particles are rolled, ground and sorted again, when the ball mill is used for grinding treatment in the cement clinker crude product, and adding a polycarboxylic acid high-performance water reducing agent for mixing and grinding, wherein the content of the polycarboxylic acid high-performance water reducing agent accounts for 1-2% of the weight of the cement raw material.
Example 2
The high-speed roadbed cement comprises the following raw material components in parts by weight: 80-90 parts of cement clinker, 17-28 parts of blast furnace slag, 3-8 parts of modified phosphogypsum, 4-8 parts of dry fly ash, 6-9 parts of mixed retarder and 3-5 parts of nano montmorillonite. The mixed retarder comprises the following raw material components in parts by weight: 3-7 parts of organic carboxylate and 5-9 parts of inorganic zinc salt, wherein the inorganic zinc salt comprises 5-9 parts of zinc chloride, 4-6 parts of zinc sulfate and 3-7 parts of zinc carbonate, and the mass content ratio of the zinc chloride to the zinc sulfate to the zinc carbonate is 3: 2.5: 1. the cement clinker comprises the following components in parts by mass: 75-95 parts of portland cement clinker, 10-25 parts of mineral raw materials, 4-8 parts of iron raw materials and 1-2 parts of desulfurized gypsum. The mineral raw material comprises the following components in parts by mass: 2-3 parts of tricalcium silicate, 3-5 parts of dicalcium silicate, 3-4 parts of tricalcium aluminate and 6-8 parts of tetracalcium aluminoferrite, wherein the mass ratio of the tricalcium silicate to the tetracalcium aluminoferrite is 1:2:2: 3.
Example 2 a high speed roadbed cement was prepared in the same manner as in example 1.
Example 3
The high-speed roadbed cement comprises the following raw material components in parts by weight: 70-90 parts of cement clinker, 20-28 parts of blast furnace slag, 6-10 parts of modified phosphogypsum, 5-9 parts of dry fly ash, 8-10 parts of mixed retarder and 4-6 parts of nano montmorillonite. The mixed retarder comprises the following raw material components in parts by weight: 2-6 parts of organic carboxylate and 6-8 parts of inorganic zinc salt, wherein the inorganic zinc salt comprises 4-9 parts of zinc chloride, 5-8 parts of zinc sulfate and 4-9 parts of zinc carbonate, and the mass content ratio of the zinc chloride to the zinc sulfate to the zinc carbonate is 3: 3: 1. the cement clinker comprises the following components in parts by mass: 70-95 parts of portland cement clinker, 15-25 parts of mineral raw materials, 3-8 parts of iron raw materials and 1-5 parts of desulfurized gypsum. The mineral raw material comprises the following components in parts by mass: 2-5 parts of tricalcium silicate, 3-9 parts of dicalcium silicate, 5-9 parts of tricalcium aluminate and 3-9 parts of tetracalcium aluminoferrite, wherein the mass ratio of the tricalcium silicate to the tetracalcium aluminoferrite is 1:3:3.5: 5.
The preparation method of the high-speed roadbed cement in the embodiment 3 is the same as that of the embodiment 1.
Example 4
The difference between the embodiment 4 and the embodiment 1 is that the high-speed roadbed cement also comprises 4 parts of sodium carboxymethyl cellulose powder and 2 parts of carboxyethyl cellulose.
Example 5
The difference between the embodiment 5 and the embodiment 1 is that the high-speed roadbed cement also comprises 5 parts of sodium carboxymethyl cellulose powder and 3 parts of carboxyethyl cellulose.
The test method comprises the following steps: a high-speed roadbed cement sample in the embodiments 1-5 is made into a standard sample according to GB/T1346-2011 'test method for water consumption, setting time and stability of standard consistency of cement', and physical properties of the sample such as initial setting time, final setting time and the like are measured, and test results are shown in Table 1. Table 1 performance parameters of a sample of highway base cement from examples 1-5
Experiments show that: as can be seen from Table 1, the initial setting time and the final setting time of the high-speed roadbed cement samples obtained in the embodiments 1 to 5 by the preparation method are not less than 255min and 365 to 390min, and the high-speed roadbed cement samples have excellent performances such as standard consistency, 3-day compression resistance, 3-day fracture resistance, 28-day compression resistance, 28-day fracture resistance, 28-day shrinkage rate, 28-day wear resistance and the like, so that the preparation method meets the relevant regulations of road cement, and achieves the purpose of the invention.
The method for applying the high-speed roadbed cement comprises the following steps:
s5, flattening and cleaning a road base surface to be paved, paving a tied steel frame, and fixing the steel frame with the ground;
s6, calculating the use amounts of the cement, the stones, the sand and the purified water of the high-speed roadbed according to the area and the thickness of the high-speed roadbed area to be paved, mixing and stirring the calculated use amounts of the stones, the sand and the purified water with the cement of the high-speed roadbed for more than 5 minutes to obtain paving mixed concrete;
and S7, calculating and adding the consumption of the mixed concrete by adopting the paved mixed concrete obtained in the S6 to obtain paved finished product mixed concrete, and building the paved finished product mixed concrete on the highway subgrade.
Preferably, the step of flattening the road surface in S5 includes the steps of:
s501, filling soil in the roadbed surface, and repairing the hollow to obtain an initial roadbed surface;
s502, paving lime on the initial roadbed surface to enhance the hardness of the roadbed surface and obtain a restored roadbed surface;
s503, cleaning and flattening the restored roadbed surface to obtain the roadbed surface to be paved.
Preferably, in S7, in the concrete process of laying the finished mixed concrete on the road base surface, different laying methods are adopted according to the thickness of the road surface in different laying areas:
when the thickness of the pavement of the area to be paved is less than 4cm, paving the pavement by adopting the paving mixed concrete; when the thickness of the pavement of the area to be paved is larger than 4cm, pouring a layer of paving mixed concrete with the thickness of 1cm on the substrate layer, then spreading a layer of sand, immersing the sand in the paving mixed concrete, wherein the sand layer is 1cm lower than the original pavement, and then pouring the paving mixed concrete, wherein the particle size of the sand is 30-60 mm.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (10)
1. The high-speed roadbed cement is characterized by comprising the following raw material components in parts by weight:
50-70 parts of cement clinker, 15-25 parts of blast furnace slag, 5-10 parts of modified phosphogypsum, 5-7 parts of dry fly ash, 5-8 parts of mixed retarder and 2-4 parts of nano montmorillonite.
2. The high-speed roadbed cement as claimed in claim 1, wherein the mixing retarder comprises the following raw material components in parts by weight:
4-8 parts of organic carboxylate and 5-7 parts of inorganic zinc salt, wherein the inorganic zinc salt comprises 6-9 parts of zinc chloride, 4-4.5 parts of zinc sulfate and 2-3 parts of zinc carbonate, and the mass ratio of the zinc chloride to the zinc sulfate to the zinc carbonate is 3: 2: 1.
3. the high-speed roadbed cement as claimed in claim 1, wherein the cement clinker comprises the following components by mass: 80-95 parts of portland cement clinker, 8-20 parts of mineral raw materials, 3-9 parts of iron raw materials and 1-3 parts of desulfurized gypsum, wherein the mineral raw materials comprise, by mass, 1-3 parts of tricalcium silicate, 2-5 parts of dicalcium silicate, 2-4 parts of tricalcium aluminate and 5-8 parts of tetracalcium aluminoferrite.
4. A high-speed roadbed cement, which is characterized in that the preparation method for preparing the high-speed roadbed cement of any one of claims 1-3 comprises the following steps:
s1, respectively crushing the raw material components, and removing screen residue with the diameter of more than 250 mu m through a screen;
s2, adding the raw material components into a stirrer according to the mass ratio, and uniformly mixing to obtain initial mixed raw material powder;
s3, conveying the initial mixed raw material powder to a primary decomposition kiln, carrying out preheating decomposition in a heater, then calcining at high temperature in the rotary kiln, and cooling by a grate cooler to obtain a cement clinker crude product;
and S4, grinding the cement clinker crude product for multiple times by using a roller press, a ball mill and a high-efficiency powder concentrator to obtain a high-speed roadbed cement finished product.
5. The method for preparing a high speed subgrade cement according to claim 4, characterized in that: in the step S1, the modified phosphogypsum is ground, the cement clinker, the blast furnace slag and the dry fly ash are mixed and ground, and the mixed retarder and the nano-montmorillonite are mixed and ground.
6. The method for preparing a high speed subgrade cement according to claim 4, characterized in that: in step S4, the cement clinker crude product is sent to a roller press, subjected to rolling treatment by the roller press, sent to a ball mill, subjected to milling treatment by the ball mill, then sent to a high-efficiency powder selecting machine, sorted by the high-efficiency powder selecting machine, and removed from the oversize powder particles to obtain cement clinker crude product powder, wherein the removed oversize powder particles are subjected to rolling, milling and sorting again.
7. The method for preparing a high speed subgrade cement according to claim 6, characterized in that: and when the cement clinker crude product is subjected to grinding treatment by a ball mill, adding a polycarboxylic acid high-performance water reducing agent for mixing and grinding, wherein the content of the polycarboxylic acid high-performance water reducing agent accounts for 1-2% of the weight of the cement raw material.
8. A method of application of a high speed subgrade cement according to claim 1, comprising the steps of:
s5, flattening and cleaning a road base surface to be paved, paving a tied steel frame, and fixing the steel frame with the ground;
s6, calculating the use amounts of the cement, the stones, the sand and the purified water of the high-speed roadbed according to the area and the thickness of the high-speed roadbed area to be paved, mixing and stirring the calculated use amounts of the stones, the sand and the purified water with the cement of the high-speed roadbed for more than 5 minutes to obtain paving mixed concrete;
and S7, calculating and adding the consumption of the mixed concrete by adopting the paved mixed concrete obtained in the S6 to obtain paved finished product mixed concrete, and building the paved finished product mixed concrete on the highway subgrade.
9. The method of claim 8, wherein the flattening of the road surface in the S5 step comprises the steps of:
s501, filling soil in the roadbed surface, and repairing the hollow to obtain an initial roadbed surface;
s502, paving lime on the initial roadbed surface to enhance the hardness of the roadbed surface and obtain a restored roadbed surface;
s503, cleaning and flattening the restored roadbed surface to obtain the roadbed surface to be paved.
10. The method as claimed in claim 8, wherein the concrete process of applying the ready-mixed concrete to the road surface in S7 is carried out by applying different paving methods according to the thickness of the road surface in different paving areas:
when the thickness of the pavement of the area to be paved is less than 4cm, paving the pavement by adopting the paving mixed concrete;
when the thickness of the pavement of the area to be paved is larger than 4cm, pouring a layer of paving mixed concrete with the thickness of 1cm on the substrate layer, then spreading a layer of sand, immersing the sand in the paving mixed concrete, wherein the sand layer is 1cm lower than the original pavement, and then pouring the paving mixed concrete, wherein the particle size of the sand is 30-60 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728852.2A CN113277757A (en) | 2021-06-29 | 2021-06-29 | High-speed roadbed cement and application method thereof |
Applications Claiming Priority (1)
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Cited By (2)
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| CN113800793A (en) * | 2021-09-26 | 2021-12-17 | 枣庄中联水泥有限公司 | Cement prepared from titanium white gypsum |
| CN117164258A (en) * | 2023-09-20 | 2023-12-05 | 涞水金隅冀东环保科技有限公司 | Green low-carbon cement for roadbed and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113800793A (en) * | 2021-09-26 | 2021-12-17 | 枣庄中联水泥有限公司 | Cement prepared from titanium white gypsum |
| CN117164258A (en) * | 2023-09-20 | 2023-12-05 | 涞水金隅冀东环保科技有限公司 | Green low-carbon cement for roadbed and preparation method thereof |
| CN117164258B (en) * | 2023-09-20 | 2024-04-09 | 涞水金隅冀东环保科技有限公司 | Green low-carbon cement for roadbed and preparation method thereof |
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