CN116177908A - Retarded silicate cement for road base and preparation method thereof - Google Patents
Retarded silicate cement for road base and preparation method thereof Download PDFInfo
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- CN116177908A CN116177908A CN202310152574.XA CN202310152574A CN116177908A CN 116177908 A CN116177908 A CN 116177908A CN 202310152574 A CN202310152574 A CN 202310152574A CN 116177908 A CN116177908 A CN 116177908A
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- 239000003469 silicate cement Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000004568 cement Substances 0.000 claims abstract description 109
- 238000000227 grinding Methods 0.000 claims abstract description 68
- 239000010440 gypsum Substances 0.000 claims abstract description 38
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 38
- 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 36
- 238000002156 mixing Methods 0.000 claims abstract description 34
- 239000010881 fly ash Substances 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 32
- 235000019738 Limestone Nutrition 0.000 claims abstract description 31
- 239000006028 limestone Substances 0.000 claims abstract description 31
- 239000002893 slag Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000004615 ingredient Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 12
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 238000010025 steaming Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 4
- 229920001732 Lignosulfonate Polymers 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 claims description 3
- 239000005695 Ammonium acetate Substances 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- -1 amine acetate Chemical class 0.000 claims description 3
- 229940043376 ammonium acetate Drugs 0.000 claims description 3
- 235000019257 ammonium acetate Nutrition 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 238000003908 quality control method Methods 0.000 claims description 3
- HNNQYHFROJDYHQ-UHFFFAOYSA-N 3-(4-ethylcyclohexyl)propanoic acid 3-(3-ethylcyclopentyl)propanoic acid Chemical compound CCC1CCC(CCC(O)=O)C1.CCC1CCC(CCC(O)=O)CC1 HNNQYHFROJDYHQ-UHFFFAOYSA-N 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims 2
- 230000008901 benefit Effects 0.000 abstract description 8
- 239000006227 byproduct Substances 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 10
- 238000010276 construction Methods 0.000 description 6
- 238000005336 cracking Methods 0.000 description 6
- 230000000979 retarding effect Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 239000002440 industrial waste Substances 0.000 description 5
- 238000009411 base construction Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid group Chemical group S(O)(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical class C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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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
- 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
- C04B7/14—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
-
- 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
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses retarded silicate cement for a road base and a preparation method thereof, and belongs to the technical field of cement. The retarded silicate cement for the road base comprises the following raw materials in percentage by weight: 56 to 59 percent of clinker, 10 to 14 percent of limestone, 8 to 12 percent of fly ash, 6 to 10 percent of granulated blast furnace slag powder, 4 to 6 percent of desulfurized gypsum, 4 to 6 percent of phosphogypsum, 0.03 to 0.04 percent of grinding aid and 0.05 to 0.06 percent of retarder. The invention increases the mixing amount of the industrial by-products of the desulfurized gypsum and the phosphogypsum, thereby improving the linear expansion rate of the cement; the effect of prolonging the setting time of cement is achieved by adding phosphogypsum and retarder; the blending amount of the limestone inactive mixed material and the fly ash active mixed material is controlled, and the reinforcing grinding aid is added, so that the cement strength is improved, the grinding condition is improved, and finally, the retarded silicate cement for the road base has retarded micro-expansion characteristics and strength performance indexes reaching standards, and meanwhile, the comprehensive utilization of resources is achieved, the cement production cost is reduced, and the enterprise benefit is increased.
Description
Technical Field
The invention belongs to the technical field of cement, and particularly relates to retarded silicate cement for a road base and a preparation method thereof.
Background
The retarded silicate cement for road base is hydraulic cementing material prepared by grinding silicate cement clinker, mixed material with regulated mixing amount, proper amount of gypsum and/or other retarded materials. The special cement belongs to special cement for stabilizing a road base layer, is used for stabilizing the road base layer and an underlayment in road engineering construction, has the characteristic of retarding micro-expansion, greatly prolongs the construction delay rolling time of the road base layer, compensates the shrinkage cracking of the base layer, and is beneficial to the construction of the road base layer.
The retarder materials commonly adopted in the research and production process of the retarder silicate cement for the road base at present comprise phosphogypsum, sulfuric acid residues, saccharides, citric acids and the like, and the retarder materials are waste generated in the production process of local phosphate fertilizer enterprises, sulfuric acid enterprises, paper mills and the like, and chemical additives such as retarder grinding aids and the like are also adopted individually.
The cement stabilized base has a large shrinkage coefficient, the paved base is easy to crack, and once the base cracks, the base can reflect to the road surface to cause the cracking and damage of the road surface. In the pavement construction process, the base layer is cracked, a great deal of manpower and material resources are required to be used for repairing and reworking, the loss is huge, and the cracking problem of the cement stabilized base layer is not solved effectively so far.
The problems of large shrinkage coefficient and easy shrinkage cracking of the cement stabilized base are solved, the research and production of retarded silicate cement for road base are carried out at present, the extension of setting time is emphasized, the research on the expansion performance problem is not solved completely, and the expansion performance is important for compensating the shrinkage cracking of the cement stabilized base.
The formula used for widely producing the ordinary Portland cement at present comprises the following steps: 80% of clinker, 5% of desulfurized gypsum, 3% of limestone, 6% of slag, 6% of fly ash and 0.04% of grinding aid, and the cement has unreasonable proportion of ingredients, so that the cement has unreasonable application functional characteristics such as freezing resistance, crack resistance, seepage resistance, impact resistance, wear resistance and erosion resistance, and cannot be used as a road base layer, and has insignificant social benefit.
The preparation process of the retarded silicate cement for the road base is relatively single, and has certain disjointing with the road pavement construction requirement. In the technical rules of road pavement base construction (JTG/F20-2015), the cement is required to be ordinary silicate cement with the strength grade of 32.5 or 42.5, the initial setting time is more than 180min, the final setting time is more than 360min and less than 600min, so that the road base stable cement produced by cement enterprises is directly produced by adding retarder on the basis of P.C32.5 cement, the road base construction is difficult to meet, the requirement of the road base construction has the characteristic of retarding micro-expansion, the construction delay rolling time of the road base is prolonged, and the shrinkage cracking of the base is compensated.
The retarded silicate cement for the road base has low strength grade, the mixing amount of the mixed materials is large, and the mixing amount of the active mixed materials is high, so that the material waste is caused. The active mixed materials such as fly ash, slag and the like in partial areas are rare, and the cement production cost is high due to the excessively high mixing amount of the active mixed materials. The required phosphogypsum quality is high and has a great influence on the strength and setting time.
The patent publication number is CN 109503006A, the invention name is retarded silicate cement for road base and the production method, the disclosed cement formulation is 45-55% of clinker, 3-11% of desulfurized gypsum, 3-11% of limestone, 4-8% of slag, 25-35% of fly ash and 0.8% of grinding aid. The consumption of the grinding aid reaches 0.8 percent, and exceeds the national standard of the addition amount of the liquid grinding aid in cement: and cannot exceed 0.5% of the cement mass. The mixing amount of the active cement admixture fly ash reaches 25-35%, the mixing amount of the active cement admixture is large, and the fly ash has high price, so that the production cost of cement is higher.
In conclusion, the retarded silicate cement for the road base with retarded micro-expansion characteristic, excellent and stable performance is researched and developed by combining with the reduction of the mixing amount of the active mixed materials, comprehensively utilizing industrial waste residues and reducing the production cost of cement.
Disclosure of Invention
Aiming at the problems, the invention provides the retarded silicate cement for the road base, which can increase the linear expansion rate of cement by increasing the mixing amount of the industrial byproduct desulfurized gypsum and phosphogypsum; the effect of prolonging the setting time of cement is achieved by adding phosphogypsum and retarder; the blending amount of the limestone inactive mixed material and the fly ash active mixed material is controlled, and the reinforcing grinding aid is added, so that the cement strength is improved, the grinding condition is improved, and finally, the retarded silicate cement for the road base has retarded micro-expansion characteristics and strength performance indexes reaching standards, and meanwhile, the comprehensive utilization of resources is achieved, the cement production cost is reduced, and the enterprise benefit is increased.
The invention is realized by the following technical scheme:
the retarded silicate cement for the road base comprises the following raw materials in percentage by weight: 56 to 59 percent of clinker, 10 to 14 percent of limestone, 8 to 12 percent of fly ash, 6 to 10 percent of granulated blast furnace slag powder, 4 to 6 percent of desulfurized gypsum, 4 to 6 percent of phosphogypsum, 0.03 to 0.04 percent of grinding aid and 0.05 to 0.06 percent of retarder;
the quality control requirements of the raw materials are as follows:
clinker: f-CaO is less than or equal to 1.5 percent and SO 3 The compressive strength is not less than 1.0%, and the compressive strength is not less than 28.0MPa and not less than 57.0MPa in 3 days and 28 days respectively;
limestone: caCO (CaCO) 3 52～90％，Al 2 O 3 0.1 to 2.5 percent, and the granularity is less than or equal to 25mm;
desulfurization gypsum: pH value is more than or equal to 5.0, cl - ≤0.5％；
Phosphogypsum: the pH value is more than or equal to 8.0, and the setting time is more than or equal to 120min and less than or equal to 300min than that of natural gypsum.
The retarded silicate cement for the road base comprises the following raw materials in percentage by weight: 58.3% of clinker, 13% of limestone, 10% of fly ash, 8% of granulated blast furnace slag powder, 5.5% of desulfurized gypsum, 5.2% of phosphogypsum, 0.03% of grinding aid and 0.05% of retarder.
Further, the grinding aid is any one or more than two of ammonium acetate, triethanolamine, amine acetate, propylene glycol, ethylene glycol, capric acid and naphthenic acid.
Further, the retarder is any one or more than two of polyhydroxy compound, hydroxycarboxylic acid salt and derivatives thereof, and high-sugar lignin sulfonate.
Further, the sum of the components of the mixed materials in the retarded silicate cement for the road base is more than or equal to 32%, SO 3 :4.8 to 5.5 percent, f-CaO is less than or equal to 0.8 percent, mgO is less than or equal to 3.5 percent, and the fineness of 45um is less than or equal to 15 percent.
Further, the expansion rate of 7 antennae of the retarded silicate cement for the road base is more than or equal to 0.10%, the expansion rate of 28 antennae is less than or equal to 0.35%, the compressive strength of 7 days is more than or equal to 16.0MPa, the compressive strength of 28 days is more than or equal to 36.0MPa, the initial setting time is more than or equal to 300min, the final setting time is more than or equal to 360min and less than or equal to 500min, the internal irradiation index IRa is less than or equal to 0.4, the external irradiation index IR is less than or equal to 0.4, the steaming stability is 0.04%, and the boiling method and the soaking method stability are qualified.
The preparation method of the retarded silicate cement for the road base comprises the following steps:
(1) And (5) batching and warehousing: conveying clinker, limestone, fly ash, granulated blast furnace slag powder, desulfurized gypsum and phosphogypsum into a batching warehouse by a conveying system;
(2) Metering and proportioning: the clinker, limestone, fly ash, granulated blast furnace slag powder, desulfurized gypsum and phosphogypsum in the batching warehouse are metered and batched by a metering system according to the weight percentage of the raw materials;
(3) Grinding: delivering the metered ingredients into a cement mill, and starting the cement mill to grind;
(4) And (3) dropwise adding a grinding aid and a retarder: the grinding process of the ingredients is carried out, meanwhile, the dripping amount of the grinding aid and the retarder is controlled by a metering pump, and the grinding aid and the retarder are evenly dripped into a cement mill from the mixing point, so that a cement product is obtained after the grinding process is finished;
(5) And (3) split charging of cement: and subpackaging the obtained cement product in a cement bulk machine and a packaging machine.
Further, in the step (3), the stirring speed of the grinding process is 1200-2000 rpm, and the stirring time is 2.5-8 h.
Further, in the step (4), the flow rate controlled by the mixing of the grinding aid and the retarder into the metering pump is 120-180L/h.
Further, in the step (4), the dripping and mixing points of the grinding aid and the retarder are positions uniformly dripped into the cement grinding head from the grinding head of the cement grinding machine.
In the invention, the grinding aid and the retarder are additives, and the dripping amount of the grinding aid and the retarder respectively accounts for 0.03-0.04% and 0.05-0.06% of the total weight percentage of ingredients (clinker, limestone, fly ash, granulated blast furnace slag powder, desulfurized gypsum and phosphogypsum) in the cement mill.
Compared with the prior art, the invention has the advantages that:
1. the invention has the characteristic of retarding micro-expansion according to the requirements of silicate cement for road base, and the cement micro-expansion source is mainly SO 3 ，SO 3 Affecting the retarding effect of cement, while SO 3 The cement is mainly provided by the desulfurized gypsum and the phosphogypsum, and the mixing amount of the desulfurized gypsum and the phosphogypsum is 4-6% by mixing a proper amount of the desulfurized gypsum and the phosphogypsum, so that the purposes of delaying the setting time of the cement and improving the linear expansion rate can be achieved, and the cement has the micro-expansion characteristic at the early stage and does not influence the structure of the cement.
2. The invention simultaneously controls the pH value of phosphogypsum and the prolonged retarding effect of setting time, and reduces the content of soluble phosphorus in phosphogypsum by controlling the pH value of phosphogypsum to be more than or equal to 8.0, so that the phosphogypsum can better exert a control function, the setting time is prolonged to be more than or equal to 120min and less than or equal to 300min than that of natural gypsum, and the setting time of cement can be better controlled. The invention also adds 0.05-0.06% retarder, which can prolong the setting time of cement, to stabilize the setting time of cement and the expansion rate of 7 antenna, to avoid the damage of cement material structure and the property deterioration.
3. The invention has the advantages that the mixing amount of the limestone is controlled to be 10-14% because the gypsum is large in mixing amount and inactive, and the mixing amount of the limestone of an inactive mixed material is required to be reduced in order to avoid influencing the structure and the performance of a cement material, and 0.03-0.04% of the reinforcing grinding aid is mixed to ensure that the grinding fineness and the strength of the cement reach the standards, so that the retarded silicate cement for the road base with excellent and stable performance is prepared.
4. The cement of the invention is doped with a large amount of industrial byproducts of desulfurized gypsum and phosphogypsum, the total doping amount of gypsum reaches 8-12% of the mass of the cement, the industrial waste is fully utilized, and the exploitation of natural resources is reduced. Meanwhile, the inactive mixed material of low-price limestone is mixed, the mixing amount of the limestone is 10-14%, the active mixed material of low-price fly ash is mixed, the mixing amount of the fly ash is 8-12%, the mixing amount (25-35%) of the fly ash in the prior art is reduced by more than 13%, and the material waste caused by the mixing amount of the active mixed material is reduced. The invention realizes the saving of cement clinker resources, comprehensive utilization of industrial waste residues, and achieves the purposes of comprehensive utilization of resources, energy conservation and emission reduction, compared with the prior art, the cost of cement raw materials is reduced by about 20.78 percent, the cement production cost is effectively reduced, and the enterprise benefit is increased.
5. The strength grade of the delayed coagulation silicate cement is 32.5, and meets the requirement of the cement in the technical rule of highway pavement base construction (JTG/F20-2015) for the strength grade. The component materials in the delayed coagulation silicate cement are more than or equal to 32 percent, SO 3 :4.8 to 5.5 percent, f-CaO is less than or equal to 0.8 percent, mgO is less than or equal to 3.5 percent, the fineness of 45um is less than or equal to 15 percent, the 7-antenna expansion rate of the delayed coagulation silicate cement is more than or equal to 0.10 percent, the 28-antenna expansion rate is less than or equal to 0.35 percent, the 7-day compressive strength is more than or equal to 16.0MPa, the 28-day compressive strength is more than or equal to 36.0MPa, the initial setting time is more than or equal to 300 minutes, and the final setting time is more than or equal to 360 percentmin is less than or equal to 500min, the internal radiation index IRa is less than or equal to 0.4, the external radiation index IR is less than or equal to 0.4, the pressure steaming stability is 0.04%, and the stability of the boiling method and the soaking method is qualified.
Drawings
Fig. 1 is a process flow diagram of the retarded silicate cement for road base according to the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are only intended to illustrate the present invention and not to limit the scope of the present invention.
In the following examples:
the quality control requirements of the raw materials are as follows:
clinker: f-CaO is less than or equal to 1.5 percent and SO 3 The compressive strength is not less than 1.0%, and the compressive strength is not less than 28.0MPa and not less than 57.0MPa in 3 days and 28 days respectively;
limestone: caCO (CaCO) 3 52～90％，Al 2 O 3 0.1 to 2.5 percent, and the granularity is less than or equal to 25mm;
desulfurization gypsum: pH value is more than or equal to 5.0, cl - ≤0.5％；
Phosphogypsum: the pH value is more than or equal to 8.0, and the setting time is more than or equal to 120min and less than or equal to 300min than that of natural gypsum;
the grinding aid and retarder are in liquid state.
The ingredients of clinker, granulated blast furnace slag powder and fly ash are shown in table 1 below:
| loss on ignition (%) | SiO 2 (％) | Al 2 O 3 (％) | Fe 2 O 3 (％) | CaO(％) | MgO(％) | SO 3 (％) | f-CaO(％) | |
| Clinker material | 0.05～0.3 | 16～25 | 4～6 | 0.1～4.5 | 49～68 | 0.9～3.5 | 0.4～1.0 | 0.2～1.5 |
| Slag powder | 0～1.0 | 23～42 | 12～26 | 0.1～1.8 | 30～43 | 6～14 | 0.1～0.6 | ___ |
| Fly ash | 0.3～15 | 35～62 | 18～25 | 3.0～10.8 | 5.0～11.5 | 0.2～3.5 | 0.1～3.5 | 0～0.8 |
Example 1
The preparation method of the retarded silicate cement for the road base comprises the following steps:
(1) And (5) batching and warehousing: conveying clinker, limestone, fly ash, granulated blast furnace slag powder, desulfurized gypsum and phosphogypsum into a batching warehouse by a conveying system;
(2) Metering and proportioning: metering ingredients in an ingredient warehouse through a metering system according to 58.3% of clinker, 13% of limestone, 10% of fly ash, 8% of granulated blast furnace slag powder, 5.5% of desulfurized gypsum and 5.2% of phosphogypsum;
(3) Grinding: delivering the metered ingredients into a cement mill, starting the cement mill to grind, wherein the stirring speed is 1600rpm, and the stirring time is 6 hours;
(4) And (3) dropwise adding a grinding aid and a retarder: simultaneously controlling the dripping amount of ammonium acetate and high-sugar lignin sulfonate by a metering pump while grinding ingredients, wherein the dripping amount respectively accounts for 0.03 percent and 0.05 percent of all ingredients in a cement mill, the flow controlled by a mixing metering pump is 130L/h, the dripping mixing point is a position directly added into the mill from a grinding head of the cement mill, and the retarded silicate cement product for a road base layer is obtained after grinding is finished;
(5) And (3) split charging of cement: and subpackaging the obtained cement product in a cement bulk machine and a packaging machine.
Example 2
The preparation method of the retarded silicate cement for the road base comprises the following steps:
(1) And (5) batching and warehousing: conveying clinker, limestone, fly ash, granulated blast furnace slag powder, desulfurized gypsum and phosphogypsum into a batching warehouse by a conveying system;
(2) Metering and proportioning: metering ingredients in an ingredient warehouse through a metering system according to 59% of clinker, 14% of limestone, 12% of fly ash, 6% of granulated blast furnace slag powder, 5% of desulfurized gypsum and 4% of phosphogypsum;
(3) Grinding: delivering the metered ingredients into a cement mill, starting the cement mill to grind, wherein the stirring speed is 1200rpm, and the stirring time is 2.5 hours;
(4) And (3) dropwise adding a grinding aid and a retarder: simultaneously controlling the dripping amount of the amine acetate and the polyhydroxy compound by a metering pump while grinding ingredients, wherein the dripping amount respectively accounts for 0.04 percent and 0.06 percent of all ingredients in a cement mill, the flow controlled by a mixing metering pump is 120L/h, the dripping mixing point is a position directly added into the mill from a grinding head of the cement mill, and the retarded silicate cement product for a road base layer is obtained after grinding is finished;
(5) And (3) split charging of cement: and subpackaging the obtained cement product in a cement bulk machine and a packaging machine.
Example 3
The preparation method of the retarded silicate cement for the road base comprises the following steps:
(1) And (5) batching and warehousing: conveying clinker, limestone, fly ash, granulated blast furnace slag powder, desulfurized gypsum and phosphogypsum into a batching warehouse by a conveying system;
(2) Metering and proportioning: the ingredients in the ingredients warehouse are metered and mixed according to 56% of clinker, 10% of limestone, 8% of fly ash, 10% of granulated blast furnace slag powder, 4% of desulfurized gypsum and 6% of phosphogypsum by a metering system;
(3) Grinding: delivering the metered ingredients into a cement mill, starting the cement mill to grind, wherein the stirring speed is 1500rpm, and the stirring time is 5 hours;
(4) And (3) dropwise adding a grinding aid and a retarder: simultaneously controlling the dripping amount of propylene glycol and high-sugar lignin sulfonate by a metering pump while grinding ingredients, wherein the dripping amount respectively accounts for 0.03 percent and 0.05 percent of all ingredients in a cement mill, the flow controlled by a mixing metering pump is 150L/h, the dripping mixing point is a position directly added into the mill from a grinding head of the cement mill, and the retarded silicate cement product for a road base layer is obtained after grinding is finished;
(5) And (3) split charging of cement: and subpackaging the obtained cement product in a cement bulk machine and a packaging machine.
Example 4
The preparation method of the retarded silicate cement for the road base comprises the following steps:
(1) And (5) batching and warehousing: conveying clinker, limestone, fly ash, granulated blast furnace slag powder, desulfurized gypsum and phosphogypsum into a batching warehouse by a conveying system;
(2) Metering and proportioning: metering ingredients in an ingredient warehouse through a metering system according to 57% of clinker, 14% of limestone, 9% of fly ash, 9% of granulated blast furnace slag powder, 6% of desulfurized gypsum and 5% of phosphogypsum;
(3) Grinding: delivering the metered ingredients into a cement mill, starting the cement mill to grind, wherein the stirring speed is 2000rpm, and the stirring time is 8 hours;
(4) And (3) dropwise adding a grinding aid and a retarder: simultaneously controlling the dripping amount of triethanolamine and polyhydroxy compound by a metering pump while grinding ingredients, wherein the dripping amount respectively accounts for 0.03 percent and 0.05 percent of all ingredients in a cement mill, the flow controlled by a mixing metering pump is 160L/h, the dripping mixing point is a position directly added into the mill from a grinding head of the cement mill, and the retarded silicate cement product for a road base is obtained after grinding is finished;
(5) And (3) split charging of cement: and subpackaging the obtained cement product in a cement bulk machine and a packaging machine.
The road base prepared in examples 1 to 4 was subjected to component detection with retarded silicate cement, and the results are shown in Table 2 below.
Table 2 the component contents of the retarded silicate cements for road base of examples 1 to 3
The road base prepared in examples 1 to 4 was subjected to performance test with retarded silicate cement, test method: the specific test method comprises the following steps: GB/T1346-2011 'Standard for Water consumption, setting time and stability inspection method of Cement Standard consistency', stable soaking method according to JC/T1099-2009 calcium sulfoaluminate modified Portland Cement 'Standard, pressure steaming stability according to GB/T750-1992 Standard for cement pressure steaming stability test method', fineness according to GB/T1345-2005 Standard for Cement fineness inspection method ', cement Strength according to GB/T17671-1999 Standard for Cement mortar Strength inspection method (ISO method), and expansion ratio test according to JC/T313-2009 expansion Cement expansion ratio test method'.
The test results are shown in table 3 below.
Table 3 performance parameters of the retarded silicate cements for road substrates of examples 1-4
As can be seen from tables 2 and 3, the component materials in the retarded silicate cement for road base of the present invention are not less than 32% and SO 3 :4.8-5.5%, f-CaO is less than or equal to 0.8%, mgO is less than or equal to 3.5%, fineness of 45um is less than or equal to 15%, expansion rate of a retarding silicate cement 7 antenna is more than or equal to 0.10%, expansion rate of a 28 antenna is less than or equal to 0.35%, compression strength in 7 days is more than or equal to 16.0MPa, compression strength in 28 days is more than or equal to 36.0MPa, initial setting time is more than or equal to 300min, final setting time is more than or equal to 360min and less than or equal to 500min, pressure steaming stability is 0.04%, and stability of a boiling method and a soaking method are qualified.
Table 4 cost of the retarded silicate cement for road base of examples 1-4 (measured by preparing one ton of cement)
As is clear from Table 4, the cost of the retarded silicate cement for road base of the present invention was about 180.6 yuan/ton, and the cement cost was low. The patent publication No. CN 109503006A discloses a retarded silicate cement for road base and a production method thereof, and the cement formula disclosed in the embodiment 2 of the specification is as follows: 50% of clinker, 7% of desulfurized gypsum, 7% of limestone, 6% of slag, 30% of fly ash and 0.8% of grinding aid, the raw material cost measured and calculated for producing one ton of cement is 227.96 yuan, compared with the raw material cost for producing the cement, the cement raw material cost is reduced by about 20.78%, which indicates that the invention can effectively reduce the cement production cost and increase the enterprise benefit.
The invention mixes a large amount of industrial waste residue desulfurized gypsum and phosphogypsum when preparing cement, simultaneously mixes a low-price limestone inactive mixed material, and less mixes a high-price fly ash active mixed material, thereby reducing the material waste caused by high mixing amount of active mixed material, realizing saving cement clinker resources, comprehensively utilizing industrial waste residue, achieving the purposes of comprehensive utilization of resources, energy conservation and emission reduction, simultaneously reducing cement production cost and increasing enterprise benefits.
Claims (10)
1. The retarded silicate cement for the road base is characterized by comprising the following raw materials in percentage by weight: 56 to 59 percent of clinker, 10 to 14 percent of limestone, 8 to 12 percent of fly ash, 6 to 10 percent of granulated blast furnace slag powder, 4 to 6 percent of desulfurized gypsum, 4 to 6 percent of phosphogypsum, 0.03 to 0.04 percent of grinding aid and 0.05 to 0.06 percent of retarder;
the quality control requirements of the raw materials are as follows:
clinker: f-CaO is less than or equal to 1.5 percent and SO 3 The compressive strength is not less than 1.0%, and the compressive strength is not less than 28.0MPa and not less than 57.0MPa in 3 days and 28 days respectively;
limestone: caCO (CaCO) 3 52～90％，Al 2 O 3 0.1 to 2.5 percent, and the granularity is less than or equal to 25mm;
desulfurization gypsum: pH value is more than or equal to 5.0, cl - ≤0.5％；
Phosphogypsum: the pH value is more than or equal to 8.0, and the setting time is more than or equal to 120min and less than or equal to 300min than that of natural gypsum.
2. The retarded silicate cement for road base according to claim 1, comprising the following raw materials in weight percent: 58.3% of clinker, 13% of limestone, 10% of fly ash, 8% of granulated blast furnace slag powder, 5.5% of desulfurized gypsum, 5.2% of phosphogypsum, 0.03% of grinding aid and 0.05% of retarder.
3. The retarded silicate cement for road base according to claim 1, wherein the grinding aid is any one or a combination of two or more of ammonium acetate, triethanolamine, amine acetate, propylene glycol, ethylene glycol, caproic acid and naphthenic acid.
4. The retarded silicate cement for road base according to claim 1, wherein the retarder is any one or two or more of polyhydroxy compound, hydroxycarboxylic acid salt and its derivative, high-sugar lignin sulfonate.
5. The retarded silicate cement for road base according to claim 1, wherein the total of the mixed material components in the retarded silicate cement for road base is not less than 32%, SO 3 :4.8 to 5.5 percent, f-CaO is less than or equal to 0.8 percent, mgO is less than or equal to 3.5 percent, and the fineness of 45um is less than or equal to 15 percent.
6. The retarded silicate cement for road base according to claim 1, wherein the retarded silicate cement for road base has a 7-antenna expansion ratio of not less than 0.10%, a 28-antenna expansion ratio of not more than 0.35%, a 7-day compressive strength of not less than 16.0MPa, a 28-day compressive strength of not less than 36.0MPa, an initial setting time of not less than 300min, a final setting time of not less than 360min and not more than 500min, an internal irradiation index IRa of not more than 0.4, an external irradiation index IR of not more than 0.4, a press steaming stability of 0.04%, and stability by boiling and soaking are acceptable.
7. A method for preparing the retarded silicate cement for a road base according to any one of claims 1 to 6, comprising the steps of:
(1) And (5) batching and warehousing: conveying clinker, limestone, fly ash, granulated blast furnace slag powder, desulfurized gypsum and phosphogypsum into a batching warehouse by a conveying system;
(2) Metering and proportioning: the clinker, limestone, fly ash, granulated blast furnace slag powder, desulfurized gypsum and phosphogypsum in the batching warehouse are metered and batched by a metering system according to the weight percentage of the raw materials;
(3) Grinding: delivering the metered ingredients into a cement mill, and starting the cement mill to grind;
(4) And (3) dropwise adding a grinding aid and a retarder: the grinding process of the ingredients is carried out, meanwhile, the dripping amount of the grinding aid and the retarder is controlled by a metering pump, and the grinding aid and the retarder are evenly dripped into a cement mill from the mixing point, so that a cement product is obtained after the grinding process is finished;
(5) And (3) split charging of cement: and subpackaging the obtained cement product in a cement bulk machine and a packaging machine.
8. The method for producing a retarded silicate cement for a road foundation according to claim 7, wherein in step (3), the stirring speed of the grinding process is 1200 to 2000rpm and the stirring time is 2.5 to 8 hours.
9. The method for preparing retarded silicate cement for road base according to claim 7, wherein in the step (4), the flow rate controlled by the mixing of the grinding aid and retarder into the metering pump is 120-180L/h.
10. The method for producing a retarded silicate cement for a road foundation according to claim 9, wherein in the step (4), the dripping-in point of the grinding aid and retarder is a position in which the grinding aid and retarder are uniformly dripped from the grinding head of the cement grinding mill into the grinding head.
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