CN114524653B - Pavement repair material and preparation method thereof - Google Patents
Pavement repair material and preparation method thereof Download PDFInfo
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- CN114524653B CN114524653B CN202210260280.4A CN202210260280A CN114524653B CN 114524653 B CN114524653 B CN 114524653B CN 202210260280 A CN202210260280 A CN 202210260280A CN 114524653 B CN114524653 B CN 114524653B
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to the technical field of pavement repair engineering, in particular to a pavement repair material and a preparation method thereof, wherein the pavement repair material is prepared from the following raw materials in parts by weight: 25 to 30 portions of iron tailing powder, 260 to 275 portions of cement clinker, 895 to 910 portions of sand, 145 to 160 portions of water and 0.5 to 1 portion of dihydrate gypsum powder. The preparation method of the pavement repairing material provided by the invention can fully excite the potential activity of the iron tailing powder, the pavement repairing material prepared by replacing part of cement with the activated iron tailing powder has good physical and mechanical properties, and on the basis of reducing the use amount of cement, the pavement repairing material can be ensured to have good strength, durability and wear resistance, the generation of pavement cracks is reduced, the secondary utilization of tailings is realized, and the harm of the iron tailings to the environment is reduced.
Description
Technical Field
The invention relates to the technical field of pavement repair engineering, in particular to a pavement repair material and a preparation method thereof.
Background
The road is a very important traffic tie in the current society and is related to the daily travel of people. With the rapid increase of traffic volume, the large-scale and heavy-load of vehicles and the influence of extreme climate, the pavement inevitably has the phenomena of early damage such as cracks, loose surfaces, pits and the like with different degrees, the service performance of the pavement is reduced, and the safety and the durability of a concrete structure are seriously influenced. In order to maintain good service performance of the road surface and prolong the service life, the road surface should be repaired in time at the initial stage of the damage phenomenon of the road surface. The cement mortar is prepared from cement and fine aggregate, and is widely applied to pavement repair engineering due to the advantages of convenient material acquisition, moisture resistance, good comprehensive performance and the like. However, the consistency and wear resistance of cement mortar are poor, so that the common cement mortar used as a repairing material of a pavement has the defects of poor strength, durability and wear resistance.
The iron tailings are ore waste residues left after useful components are extracted from iron ores, and account for about one third of the total amount of the tailings. With the improvement of the mineral separation technology, the iron ore is ground to be finer and finer, so that the tailings are also finer and finer, and can not be used as fine aggregates. A large amount of iron tailings are formed in each year mining activities in China, the large amount of stockpiling of the iron tailings not only seriously damages the ecological environment, but also has higher potential safety hazard, and the comprehensive utilization of the iron tailings is mainly encouraged and supported by national policies all the time. The chemical components of the iron tailings mainly contain SiO 2 、Al 2 O 3 、CaO、Fe 2 O 3 MgO, etc. and a small amount of K 2 O、Na 2 5363 and O, S, P, and the common iron tailings do not have any gelling property and can not replace hydraulic lime and cement in the repair mortar.
Disclosure of Invention
In view of the above, the invention provides a pavement repair material and a preparation method thereof, and the pavement repair material obtained by the preparation method of the invention can ensure that the pavement repair material has good strength, durability and wear resistance on the basis of reducing the use amount of cement, reduces the generation of pavement cracks, realizes the secondary utilization of iron tailings, reduces the harm of the iron tailings to the environment, and overcomes the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a pavement repairing material, which is prepared from the following raw materials in parts by weight: 25 to 30 portions of iron tailing powder, 260 to 275 portions of cement clinker, 895 to 910 portions of sand, 145 to 160 portions of water and 0.5 to 1 portion of dihydrate gypsum powder.
According to the scheme shown in the embodiment of the invention, the iron tailing powder is fine and can be filled in gaps between cement clinker and sand, so that the structure of the pavement repair material is more compact, and the iron phase of the iron tailing powder is high, and the iron tailing powder can be doped into cement mortar, so that the wear resistance of the pavement repair material can be obviously enhanced; the dihydrate gypsum can be adsorbed on the surface of the iron tailing powder, an adsorption film is formed on the surface of the dihydrate gypsum, the van der Waals attraction and the electrostatic force among the iron tailing powder are weakened, the surface energy of the iron tailing powder is reduced, the reaction activity of the iron tailing powder is improved, the activated iron tailing powder can promote the early hydration of cement, and the compression resistance and the fracture resistance of the pavement repairing material are improved; according to the invention, by reasonably limiting the mass ratio of the iron tailing powder, the cement clinker, the sand, the water and the dihydrate gypsum powder, the cement can be replaced for roadside restoration, the use amount of the cement is reduced, the cement has good strength, durability and wear resistance, the secondary utilization of the iron tailings is realized, the harm of the iron tailings to the environment is reduced, and the defects of the prior art are overcome.
In combination with the first aspect, the iron tailings powder contains 20wt% to 25wt% of zeolite.
The higher the content of zeolite in the iron tailing powder is, the better the activity of the crushed iron tailings is.
In combination with the first aspect, the iron tailing powder also contains 20 to 25 weight percent of quartz, 15 to 20 weight percent of amphibole and 25 to 30 weight percent of chlorite.
In combination with the first aspect, the cement clinker is high alumina cement.
The high-alumina cement is a fast-hardening, high-strength and corrosion-resistant cementing material, and can increase the early strength of the cement mortar and enhance the corrosion resistance of the mortar.
In combination with the first aspect, the dihydrate gypsum powder has a specific surface area of 220 to 270m 2 /kg。
The grinding effect of the iron tailing powder can be improved by controlling the surface area of the dihydrate gypsum powder.
The second aspect of the present invention provides a preparation method of the above pavement repair material, which at least comprises the following steps:
drying and calcining iron tailing powder to obtain primary iron tailing powder;
uniformly mixing the primary iron tailing powder and dihydrate gypsum powder, and grinding to obtain a powder mixture;
and uniformly stirring the powder mixture with cement clinker, sand and water to obtain the pavement repairing material.
The preparation method of the pavement repairing material provided by the invention is simple, has strong operability and practicability, does not use and generate substances harmful to the environment in the process of treating the iron tailing powder, and meets the requirements of environmental protection.
With reference to the second aspect, the drying temperature is 100-105 ℃, and the drying time is 10-12 h.
With reference to the second aspect, the calcination temperature is 500-550 ℃ and the calcination time is 1.5-2 h.
In combination with the second aspect, the temperature increase rate from the drying step to the calcining step is 10 to 15 ℃/min.
By controlling the heating rate, the iron tailing powder with the best activation effect can be obtained, and the too fast heating rate from the drying process to the calcining process can cause insufficient activation and the too slow heating rate can cause energy waste.
With reference to the second aspect, the grinding is carried out on a test mill, the rotation speed of the test mill is 45-55 r/min, and the grinding time is 90-120 min.
The iron tailing powder with the highest activity can be obtained by controlling the rotating speed and the grinding time; the iron tailing powder cannot be fully ground when the grinding time is too short, and the internal cracks of the iron tailing powder particles begin to generate the phenomena of compaction and welding when the grinding time is too long, so that the specific surface area of the iron tailing powder is reduced, and further the reaction activity is reduced. After grinding to obtainThe density of the activated iron tailing micro powder is 2.75g/cm 3 The specific surface area is 770m 2 Per kg, the mean particle diameter D50 was 3.2. Mu.m. The particle shape of the ground powder mixture tends to be spherical and the edge is smooth, so that the water requirement of the cement paste is reduced, the water retention property and the uniformity are enhanced, and the workability and the mechanical property of the concrete are improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to solve the problems that cement mortar is poor in strength, durability and wear resistance, and iron tailings cannot replace hydraulic lime and cement in repair mortar during comprehensive utilization, the embodiment of the invention provides a pavement repair material and a preparation method thereof.
The pavement repairing material is prepared from the following raw materials in parts by weight: 25 to 30 portions of iron tailing powder, 260 to 275 portions of cement clinker, 895 to 910 portions of sand, 145 to 160 portions of water and 0.5 to 1 portion of dihydrate gypsum powder.
In the scheme shown in the embodiment of the invention, the iron tailing powder can be filled in the gap between the cement clinker and the sand, so that the structure of the pavement repairing material is more compact, and the iron phase of the iron tailing powder is high, and the iron tailing powder is mixed into cement mortar, so that the wear resistance of the pavement repairing material can be obviously enhanced; the dihydrate gypsum can be adsorbed on the surface of the iron tailing powder, the surface energy of the iron tailing powder is reduced, the reactivity of the iron tailing powder is improved, the activated iron tailing powder can promote the early hydration of cement, and the compression resistance and the fracture resistance of the pavement repairing material are improved.
Wherein the sand can be standard sand with fineness modulus of 2.3-3.0 and mud content of 0.8-1.2%; the cement clinker can be high-alumina cement, so that the early strength of the cement mortar can be increased, and the corrosion resistance of the mortar can be enhanced.
The embodiment of the invention also provides a preparation method of the pavement repair material, which comprises the following steps: at least comprises the following steps:
drying and calcining iron tailing powder to obtain primary iron tailing powder;
uniformly mixing the primary iron tailing powder and dihydrate gypsum powder, and grinding to obtain a powder mixture;
and uniformly stirring the powder mixture with cement clinker, sand and water to obtain the pavement repairing material.
According to the scheme shown in the embodiment of the invention, the iron tailing powder is dried and then calcined at high temperature to remove structural water in the iron tailing powder, so that the activity of the iron tailing powder can be preliminarily improved; the dihydrate gypsum is added into the primary iron tailing powder, so that the dihydrate gypsum can not only reduce the surface energy of iron tailing powder particles and improve the reactivity of the iron tailing powder, but also ensure that the iron tailing powder is easy to disperse and convenient to grind, and the grinding effect of the iron tailing powder is improved; the primary iron tailing powder and the dihydrate gypsum are mixed and ground, on one hand, the iron tailing powder is subjected to the actions of mechanical impact force, shearing force, pressure and the like, so that the minerals in a condensed state are subjected to chemical change or physical and chemical change, lattice distortion, local damage and lattice defects are generated, the internal energy of the iron tailing powder minerals is increased, and the reaction activity of the iron tailing powder is obviously enhanced; on the other hand, the fineness of the ground activated iron tailing powder is finer, and the finer the fineness of the iron tailing powder is, the higher the hydration activity is within a specific range, so that the hydration activity of the ground activated iron tailing powder is higher, the early hydration of cement can be promoted, and the compression resistance and the fracture resistance of the pavement repairing material can be further improved; the shape of the ground powder mixture particles tends to be spherical and the edges are smooth, so that the water requirement of the cement paste is reduced, the water retention property and the uniformity are enhanced, and the workability and the mechanical property of the pavement repairing material are improved. According to the invention, the iron tailing powder is subjected to high-temperature thermal activation, chemical activation and mechanical activation, so that the potential activity of the iron tailing powder can be fully excited, the high-activity iron tailing powder is prepared, and the pavement repair material prepared by replacing part of cement with the activated iron tailing powder has good physical and mechanical properties and durability, can reduce pavement cracks and has better wear resistance.
The invention has the utilization rate of the iron tailing powder close to 100 percent, not only saves the production cost, but also realizes the purpose of secondary utilization of the tailings, and has important significance for promoting the development of green mines and the sustainable development of mineral resources and protecting the ecological environment.
Example 1
The embodiment provides a pavement repairing material which is prepared from the following raw materials in parts by weight: 25 parts of iron tailing powder (the content of quartz is 25wt%, the content of amphibole is 15wt%, the content of zeolite is 25wt%, the content of chlorite is 25wt%, and the balance is impurities), 275 parts of high-alumina cement, 895 parts of sand (the fineness modulus is 3.0, the content of mud is 0.8%), 160 parts of water and 0.5 part of dihydrate gypsum powder (the specific surface area is 270 m) 2 /kg)；
The preparation method of the pavement repairing material comprises the following steps:
putting the iron tailing powder into a blast oven to be dried for 12h at 100 ℃, putting the iron tailing powder into a muffle furnace to be calcined for 2h at 500 ℃, wherein the heating rate from the drying process to the calcining process is 10 ℃/min, closing the muffle furnace after the calcination is finished, and naturally cooling the temperature in the furnace chamber of the muffle furnace to room temperature (25 ℃) to obtain primary iron tailing powder;
uniformly mixing the primary iron tailing powder and dihydrate gypsum powder according to the model number
Grinding the 5kg cement test mill, wherein the rotating speed of the cement test mill is 45r/min, and the grinding time is 120min to obtain a powder mixture;
and uniformly stirring the powder mixture with cement clinker, sand and water to obtain the pavement repairing material.
Example 2
The embodiment provides a pavement repairing material which is prepared from the following raw materials in parts by weight: 30 parts of iron tailing powder (the content of quartz is 20wt%, the content of amphibole is 20wt%, the content of zeolite is 20wt%, the content of chlorite is 30wt%, and the balance is impurities), 260 parts of high-alumina cement, 910 parts of sand (the fineness modulus is 2.3, the content of mud is 1.2%), 145 parts of water and 1 part of dihydrate gypsum powder (the specific surface area is 220 m) 2 /kg)；
The preparation method of the pavement repairing material comprises the following steps:
putting the iron tailing powder into a blast oven to be dried for 10h at 105 ℃, putting the iron tailing powder into a muffle furnace to be calcined for 1.5h at 550 ℃, wherein the heating rate from the drying process to the calcining process is 15 ℃/min, closing the muffle furnace after the calcination is finished, and naturally cooling the temperature in a furnace chamber of the muffle furnace to room temperature (25 ℃) to obtain primary iron tailing powder;
uniformly mixing the primary iron tailing powder and dihydrate gypsum powder according to the model number
Grinding the 5kg cement test mill, wherein the rotating speed of the cement test mill is 55r/min, and the grinding time is 90min to obtain a powder mixture;
and uniformly stirring the powder mixture with cement clinker, sand and water to obtain the pavement repairing material.
Example 3
The embodiment provides a pavement repairing material which is prepared from the following raw materials in parts by weight: 28 parts of iron tailings powder (23 wt% of quartz, 17wt% of hornblende, 22wt% of zeolite, 28wt% of chlorite and the balance impurities), 270 parts of high-alumina cement, 900 parts of sand (fineness modulus of 2.6, mud content of 1.1%), 155 parts of water and 0.7 part of dihydrate gypsum powder (specific surface area of 250 m) 2 /kg)；
The preparation method of the pavement repairing material comprises the following steps:
putting the iron tailing powder into a blast oven to be dried for 11h at 102 ℃, putting the iron tailing powder into a muffle furnace to be calcined for 1.7h at 530 ℃, wherein the heating rate from the drying process to the calcining process is 13 ℃/min, closing the muffle furnace after the calcination is finished, and naturally cooling the temperature in a furnace chamber of the muffle furnace to room temperature (25 ℃) to obtain primary iron tailing powder;
uniformly mixing the primary iron tailing powder and dihydrate gypsum powder according to the model number
5kg cement test millGrinding at the rotating speed of 48r/min for 110min to obtain a powder mixture;
and uniformly stirring the powder mixture with cement clinker, sand and water to obtain the pavement repairing material.
Example 4
The embodiment provides a pavement repairing material which is prepared from the following raw materials in parts by weight: 27 parts of iron tailing powder (the content of quartz is 22wt%, the content of amphibole is 18wt%, the content of zeolite is 23wt%, the content of chlorite is 27wt%, and the balance is impurities), 268 parts of high-alumina cement, 905 parts of sand (the fineness modulus is 2.7, the content of mud is 1.0%), 151 parts of water and 0.8 part of dihydrate gypsum powder (the specific surface area is 240 m) 2 /kg)；
The preparation method of the pavement repairing material comprises the following steps:
putting the iron tailing powder into a blast oven to be dried for 10 hours at 103 ℃, putting the iron tailing powder into a muffle furnace to be calcined for 1.8 hours at 520 ℃, wherein the heating rate from the drying process to the calcining process is 12 ℃/min, closing the muffle furnace after the calcination is finished, and naturally cooling the temperature in a furnace chamber of the muffle furnace to room temperature (25 ℃) to obtain primary iron tailing powder;
uniformly mixing the primary iron tailing powder and dihydrate gypsum powder according to the model number
Grinding the 5kg cement test mill, wherein the rotating speed of the cement test mill is 48r/min, and the grinding time is 105min, so as to obtain a powder mixture;
and uniformly stirring the powder mixture with cement clinker, sand and water to obtain the pavement repairing material.
Example 5
The embodiment provides a pavement repairing material which is prepared from the following raw materials in parts by weight: 26 parts of iron tailing powder (the content of quartz is 24wt%, the content of amphibole is 16wt%, the content of zeolite is 24wt%, the content of chlorite is 26wt%, and the balance is impurities), 270 parts of high-alumina cement, 900 parts of sand (the fineness modulus is 2.4, the content of mud is 1.1%), 148 parts of water and 0.9 part of dihydrate gypsum powder (the specific surface area is 235 m) 2 /kg)；
The preparation method of the pavement repairing material comprises the following steps:
putting the iron tailing powder into a blast oven to be dried for 11.5h at 102 ℃, putting the iron tailing powder into a muffle furnace to be calcined for 1.7h at 510 ℃, wherein the heating rate from the drying process to the calcining process is 14 ℃/min, closing the muffle furnace after the calcination is finished, and naturally cooling the temperature in a furnace chamber of the muffle furnace to room temperature (25 ℃) to obtain primary iron tailing powder;
uniformly mixing the primary iron tailing powder and dihydrate gypsum powder according to the model number
Grinding the 5kg cement test mill at the rotating speed of 48r/min for 115min to obtain a powder mixture;
and uniformly stirring the powder mixture with cement clinker, sand and water to obtain the pavement repairing material.
Comparative example 1
The comparative example provides a pavement repair material tested in the research process, which is prepared from the following raw materials in parts by weight: 270 parts of high-alumina cement, 900 parts of sand (fineness modulus of 2.6 and mud content of 1.1%) and 155 parts of water;
the preparation method of the pavement repairing material comprises the following steps:
uniformly stirring cement clinker, sand and water to obtain the pavement repairing material
Comparative example 2
The comparative example provides a pavement repair material tested in the research process, which is prepared from the following raw materials in parts by weight: 28 parts of iron tailing powder (the content of quartz is 23wt%, the content of amphibole is 17wt%, the content of zeolite is 22wt%, the content of chlorite is 28wt%, and the balance is impurities), 270 parts of high-alumina cement, 900 parts of sand (the fineness modulus is 2.6, and the mud content is 1.1%) and 155 parts of water;
the preparation method of the pavement repairing material comprises the following steps:
putting the iron tailing powder into a blast oven to be dried for 11h at 102 ℃, putting the iron tailing powder into a muffle furnace to be calcined for 1.7h at 530 ℃, wherein the heating rate from the drying process to the calcining process is 13 ℃/min, closing the muffle furnace after the calcination is finished, and naturally cooling the temperature in a furnace chamber of the muffle furnace to room temperature (25 ℃) to obtain primary iron tailing powder;
the primary iron tailing powder is prepared by the following model
Grinding the 5kg cement test mill at the rotating speed of 48r/min for 110min to obtain iron tailing powder;
and uniformly stirring the iron tailing powder, cement clinker, sand and water to obtain the pavement repairing material.
Comparative example 3
The comparative example provides a pavement repair material tested in the research process, which is prepared from the following raw materials in parts by weight: 270 parts of high-alumina cement, 900 parts of sand (fineness modulus of 2.6, mud content of 1.1%), 155 parts of water and 0.7 part of dihydrate gypsum powder (specific surface area of 250m < 2 >/kg);
the preparation method of the pavement repairing material comprises the following steps:
and uniformly stirring the cement clinker, the sand and the water to obtain the pavement repairing material.
Comparative example 4
The comparative example provides a pavement repair material tested in the research process, which is prepared from the following raw materials in parts by weight: 28 parts of iron tailing powder (the content of quartz is 23wt%, the content of amphibole is 17wt%, the content of zeolite is 22wt%, the content of chlorite is 28wt%, and the balance is impurities), 270 parts of high-alumina cement, 900 parts of sand (the fineness modulus is 2.6, the content of mud is 1.1%), 155 parts of water and 0.7 part of dihydrate gypsum powder (the specific surface area is 250m < 2 >/kg);
the preparation method of the pavement repair material comprises the following steps:
putting the iron tailing powder into a blast oven to be dried for 11h at 102 ℃, putting the iron tailing powder into a muffle furnace to be calcined for 1.7h at 530 ℃, wherein the heating rate from the drying process to the calcining process is 2 ℃/min, closing the muffle furnace after the calcination is finished, and naturally cooling the temperature in a furnace chamber of the muffle furnace to room temperature (25 ℃) to obtain primary iron tailing powder;
uniformly mixing the primary iron tailing powder and dihydrate gypsum powder according to the model number
Grinding the 5kg cement test mill at a rotating speed of 48r/min for 110min to obtain a powder mixture;
and uniformly stirring the powder mixture with cement clinker, sand and water to obtain the pavement repairing material.
Examples of effects
The pavement repair materials prepared in the embodiments 1-5 and the comparative examples 1-4 of the present invention were tested for flexural strength and compressive strength according to GB/T17671-1999 method for testing the strength of cement mortar (ISO method), the specific test results are shown in Table 1:
TABLE 1
The pavement repair materials prepared in the examples 1 to 5 and the comparative examples 1 to 4 of the present invention were respectively prepared into test pieces with the dimensions of 40mm × 40mm × 160mm, and the wear rate of the pavement repair material after 1min polishing was measured by a concrete wear tester after being cured for 28d in a natural state according to the provisions of DL/T5126-2001, polymer modified Cement mortar test Specification, and the specific test results are shown in Table 2:
TABLE 2
As can be seen from the data in tables 1 and 2, the pavement repair materials of examples 1 to 5 have better physical and mechanical properties and durability than those of comparative example 1, and the pavement repair material of example 3 of the present application has better physical and mechanical properties and durability than those of comparative examples 1 to 4, and has better working performance, higher strength, better wear resistance than that of comparative example 1, and better economic and social effects.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The pavement repairing material is characterized by being prepared from the following raw materials in parts by weight: 25 to 30 portions of iron tailing powder, 260 to 275 portions of cement clinker, 895 to 910 portions of sand, 145 to 160 portions of water and 0.5 to 1 portion of dihydrate gypsum powder;
the iron tailing powder contains 20-25 wt% of zeolite;
the iron tailing powder also contains 20-25 wt% of quartz, 15-20 wt% of amphibole and 25-30 wt% of chlorite;
the preparation method of the pavement repairing material at least comprises the following steps:
drying and calcining iron tailing powder to obtain primary iron tailing powder;
uniformly mixing the primary iron tailing powder and dihydrate gypsum powder, and grinding to obtain a powder mixture;
and uniformly stirring the powder mixture with cement clinker, sand and water to obtain the pavement repairing material.
2. A pavement repair material according to claim 1, characterized in that: the cement clinker is high-alumina cement.
3. The pavement patching material of claim 1, wherein the dihydrate gypsum powder has a specific surface area of 220 to 270m 2 /kg。
4. A method for producing a pavement repair material according to any of claims 1 to 3, characterized by comprising at least the steps of:
drying and calcining iron tailing powder to obtain primary iron tailing powder;
uniformly mixing the primary iron tailing powder and dihydrate gypsum powder, and grinding to obtain a powder mixture;
and uniformly stirring the powder mixture with cement clinker, sand and water to obtain the pavement repairing material.
5. A method for producing a pavement patching material as claimed in claim 4, characterized in that: the drying temperature is 100-105 ℃, and the drying time is 10-12 h.
6. A method for producing a pavement patching material as claimed in claim 4, characterized in that: the calcining temperature is 500-550 ℃, and the calcining time is 1.5-2 h.
7. The method for producing a pavement patching material according to claim 4, wherein the temperature rise rate from the drying process to the calcining process is 10-15 ℃/min.
8. A method for producing a pavement repairing material according to claim 4, wherein said grinding is performed on a test mill, the rotation speed of said test mill is 45 to 55r/min, and the grinding time is 90 to 120min.
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| CN104860556B (en) * | 2014-02-24 | 2018-07-13 | 唐山北极熊建材有限公司 | Quick setting and rapid hardening belite sulphoaluminate cement clinker, application and its production technology |
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| CN104163582A (en) * | 2013-05-17 | 2014-11-26 | 厦门新安德矿产科技有限公司 | Cement with magnetization reduction roasting iron tailing as mixing material, and preparation method thereof |
| CN104150794A (en) * | 2014-08-30 | 2014-11-19 | 中国地质大学（武汉） | Preparation method for Portland cement with iron tailings |
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