CN114149232A - High-compactness cement-based material applied to airport pavement and preparation method thereof - Google Patents
High-compactness cement-based material applied to airport pavement and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 226
- 239000000463 material Substances 0.000 title claims abstract description 103
- 238000002360 preparation method Methods 0.000 title claims abstract description 48
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- 239000002245 particle Substances 0.000 claims abstract description 60
- 239000002086 nanomaterial Substances 0.000 claims abstract description 54
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 51
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- 239000010802 sludge Substances 0.000 claims abstract description 37
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- 239000000203 mixture Substances 0.000 claims description 35
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- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
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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
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to the technical field of cement materials, and particularly discloses a high-compactness cement-based material applied to an airport pavement and a preparation method and application thereof. The cement-based material comprises the following raw materials in parts by weight: 92-97 parts of modified cement, 0.5-1.5 parts of graded nano material, 0.01-0.1 part of nano dispersant, 0.4-1.2 parts of water reducing agent, 0.2-0.5 part of early strength agent, 1-5.6 parts of calcined cement clinker particles and aggregate with the content of the modified cement being 4-6 times; wherein: the modified cement is composed of 70-85 parts of Portland cement, 5-20 parts of sulphoaluminate cement and 5-12 parts of calcined papermaking sludge ash. The high-compactness cement-based material can really realize that the cement-based material keeps excellent mechanical property and durability in the whole service period, greatly prolongs the service life of the cement-based material, and has good popularization and application values.
Description
Technical Field
The invention relates to the field of cement materials, and particularly provides a high-compactness cement-based material applied to an airport pavement and a preparation method thereof.
Background
The cement-based material has the characteristics of low price and simple preparation process, can be widely applied since the advent, and is generally applied to various fields such as special building construction, marine infrastructure construction, civil and public buildings and the like at present. Therefore, the demand for cement materials is increasing, the national cement yield is up to 23.7 hundred million tons in 2020 according to the data of the national statistical bureau, and in the classification of cement, portland cement can prevent the concrete structure from being damaged by internal stress concentration due to reliable performance, low price, mature process, controllable components and slow hydration heat release of the portland cement, so that the cement has the largest and widest consumption in various fields of buildings. However, the cement hardened body formed by the hydration product generated by the reaction of the silicate cement-based material and water is a loose porous structure, and various problems are easily caused in the using process due to the permeation, carbonization, freeze-thaw damage and the like of chloride ions, so that the service life of the cement-based material is shortened, and the application of the cement-based material in engineering is limited; therefore, the huge amount of waste cement brought by the method also causes secondary pollution to the environment. Meanwhile, along with the development of science and technology, the requirements of people on various buildings and pavements are gradually improved.
The airport pavement concrete also has the defects of low strength, poor deformation resistance, easy cracking, easy abrasion, peeling and the like during daily use. Under the dual action of increased airplane load and freeze-thaw cycle, the further damage of the concrete can be caused after the surrounding media (air and rainwater) permeate into the concrete along the crack, thereby accelerating the development of the pavement crack, further increasing the diseases such as stripping, sand and stone exposure and the like generated on the surface layer of the pavement, and even influencing the normal take-off and landing of the airplane in serious cases due to the special characteristics required by the pavement crack. For example, Chinese patent application No. 201810376484 discloses a nano-material modified cement-based material, which has a certain improvement effect on the early strength and compactness of the cement-based material, and comprises 30-50% of portland cement, 1-2% of bonite, 0.02-0.05% of a nano-material modifier, 0.5-0.8% of a water reducing agent, 0.2-0.5% of an early strength agent, 2-4% of an expanding agent, 5-8% of latex powder, 0.2-0.5% of high-purity aluminum powder, 0.1-0.2% of methyl hydroxypropyl cellulose ether and aggregate, but cannot improve the later mechanical strength and durability, especially the long-term performance of the cement-based material.
At present, aiming at the characteristic of loose and porous Portland cement-based materials, the improvement is mainly carried out from the following aspects: firstly, mineral admixtures (such as fly ash, slag, steel slag and the like) are added, more C-S-H gel and ettringite are generated in the hydration process to achieve the aim of compacting a cement body, the later-period durability of the cement body is improved more obviously, but the early-period strength of the portland cement is reduced by adding excessive mineral admixtures, so that the early-period strength is insufficient, and when the content of an aluminate-rich phase is higher, more porous structures are caused by crystalline hydration products of the portland cement, so that a convenient channel is provided for harmful ion erosion; secondly, nanometer materials (such as nanometer silicon dioxide, nanometer calcium carbonate, nanometer titanium dioxide and the like) are added, although the early strength of the cement-based material can be improved, the porosity is reduced, and the compactness is improved, the nanometer materials are expensive and are not easy to disperse, so that the use of the cement-based material is influenced, and moreover, the nanometer materials only can provide the early advantages of a cement hardened body and have no obvious effect on the later service period; and thirdly, organic emulsion (styrene-acrylic emulsion, epoxy resin emulsion and the like) is added, so that the method can reduce the porosity of a hardened cement body, but can slow down the hydration of the cement and is not beneficial to improving the early strength. And fourthly, reducing the water consumption, wherein the water reducing agent is inevitably added, but the excessive water reducing agent can cause the segregation of the cement-based material and the reduction of the strength, and the difficulty of the construction process can be caused if no or little water reducing agent is added. Therefore, a new method is required to improve the compactness of the cement-based material, and good mechanical properties and durability in the early stage, the middle stage and the later stage are required to be ensured.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-compactness cement-based material applied to an airport pavement. The cement-based material can maintain excellent mechanical property and durability in the whole service period, and the service life is greatly prolonged.
The technical scheme adopted by the invention for solving the technical problems is as follows: the high-compactness cement-based material applied to the airport pavement comprises the following raw materials in parts by weight: 92-97 parts of modified cement, 0.5-1.5 parts of graded nano material, 0.01-0.1 part of nano dispersant, 0.4-1.2 parts of water reducing agent, 0.2-0.5 part of early strength agent, 1-5.6 parts of calcined cement clinker particles and aggregate with the content of the modified cement being 4-6 times; wherein: the modified cement is composed of 70-85 parts of Portland cement, 5-20 parts of sulphoaluminate cement and 5-12 parts of calcined papermaking sludge ash.
Further, the preparation method of the calcined papermaking sludge ash comprises the following steps: firstly, papermaking sludge ash is used, cleaned, crushed, sieved and dried, and finally calcined at 500-600 ℃ for 40-70 min.
The calcined papermaking sludge ash prepared by the method mainly comprises 25-5% of calcium aluminosilicate and 15-25% of anhydrous calcium sulfate, and the balance is inevitable impurities. In the invention, the calcined papermaking sludge ash can provide proper and necessary components for generating ettringite crystals and C-S-H gel.
Further, the grading nano material comprises 30-50 parts by weight of nano boehmite, 20-50 parts by weight of ultrafine zeolite and 10-50 parts by weight of ultrafine shell powder. Preferably, the particle diameters are respectively: 30-80 nm of nano boehmite, 80-200 nm of superfine zeolite and 200-400 nm of superfine shell powder. In the invention, the grading nano material is compounded by a plurality of materials with different grading grain sizes, can fill the pore structure of the cement-based material in a grading way, reduces the porosity of the sample at the early stage, reduces the number of intercommunicating pores, enhances the mechanical property, and can play a good role under the condition of low mixing amount.
Further, the particles of the over-burned cement clinker are mainly composed of C2S clinker and C4And (3) AF clinker composition. Said C is2S clinker and C4The AF clinker is prepared by calcining corresponding cement production raw materials at 1200-1300 ℃ for 30-60 min respectively. Preferably, C is2S clinker and C4The weight ratio of the AF clinker is (50-80) to (20-50). Preferably, the particle size of the over-burned cement clinker particles should be controlled between 100-500 um, such as 100-150 um, 130-180 um, 100-300 um, 200-350 um, 400-500 um, etc. The invention utilizes special components contained in the cement clinker particles after the overburning to contribute to the development of the middle-stage and later-stage strength and the improvement of the durability of the cement-based material.
Said C is2The preparation method of the S clinker comprises the following steps: crushing, homogenizing and washing materials such as limestone, clay and the like according to a conventional production method of portland cement, then drying until the water content is lower than 1 wt%, then pressing the mixed materials into blocks (such as round blocks with the diameter of 60mm and the thickness of 10 mm), placing the prepared block mixture into a drying oven to be dried at 100 ℃, calcining the block mixture at 1200-1300 ℃ for 30-60 min after the drying is finished, naturally cooling to room temperature and sieving to obtain C2And (5) S clinker.
Said C is4The preparation method of the AF clinker comprises the following steps: crushing, homogenizing and washing materials such as limestone, steel slag, aluminum slag and the like according to a conventional production method of portland cement, then drying until the water content is lower than 1 wt%, then pressing the mixed material into blocks (such as round blocks with the diameter of 60mm and the thickness of 10 mm), placing the prepared block mixture into a drying oven to be dried at 100 ℃, calcining the block mixture at 1200-300 ℃ for 30-60 min, naturally cooling to room temperature and sieving to obtain C4AF clinker.
Further, the early strength agent is calcium formate and/or aluminum sulfate. The addition of a small amount of calcium formate and aluminum sulfate can promote the early stage hydration of cement and make up for the characteristic of slowing down the hydration of cement caused by the nano dispersant.
Further, the nano dispersing agent comprises any one of a non-ionic surfactant and an ionic surfactant, and has the main function of uniformly dispersing all components in the graded nano material and ensuring that the components of the cement-based material are uniform in the preparation process. The nonionic surfactant is 20 type nonionic surfactant, fatty alcohol-polyoxyethylene ether, alkylolamide and/or polyethylene glycol; the ionic surfactant may employ sodium lauryl sulfate and/or an olefin sulfonate.
Further, the water reducing agent comprises any one of aliphatic series, aromatic series, naphthalene series and polycarboxylic acid, and has the functions of further refining the pore structure of the cement hardened body, reducing the porosity and improving the compactness.
Furthermore, the raw materials of the cement-based material also comprise water, and the addition amount of the water is carried out according to a water-cement ratio of 0.18-0.25.
The invention further aims to provide a preparation method of the high-compactness cement-based material applied to the airport pavement, which comprises the following steps:
(1) adding 0.01-0.1 part by weight of nano dispersing agent and 0.5-1.5 parts by weight of graded nano material into water, mixing uniformly, adding 0.4-1.2 parts by weight of water reducing agent and 0.2-0.5 part by weight of early strength agent, and mixing uniformly to obtain a mixture A;
(2) adding 92-97 parts by weight of modified cement, 1-5.6 parts by weight of calcined cement clinker particles and aggregate into the mixture A, uniformly mixing, curing to obtain a target product,
the modified cement consists of 70-85 parts of Portland cement, 5-20 parts of sulphoaluminate cement and 5-12 parts of calcined papermaking sludge ash;
the using amount of the aggregate is 4-6 times of that of the modified cement;
the addition amount of water is performed according to a water-cement ratio of 0.18-0.25.
The invention also provides a further technical task of providing the application of the high-compactness cement-based material applied to the airport pavement in the fields of construction engineering and the like.
Compared with the prior art, the high-compactness cement-based material applied to the airport pavement and the preparation method thereof have the following outstanding beneficial effects:
(1) the cement-based material adopts the modified cement which mainly comprises Portland cement, sulphoaluminate cement and calcined paper-making sludge ash, wherein the specific surface area of the calcined paper-making sludge ash is obviously increased, meanwhile, the activities of components such as calcium aluminosilicate, calcium sulfate and the like in the paper-making sludge ash are increased, the anhydrous III type calcium sulfate and high-activity calcium aluminosilicate generated by calcination are easy to generate hydration reaction with the cement-based material, C-S-H gel and ettringite crystals are quickly formed, meanwhile, the use of natural gypsum (calcium sulfate) can be reduced, and the paper-making sludge ash is changed into things of value from waste.
(2) The cement-based material of the invention adopts over-burnt C2S and C4AF cement clinker particles with reduced activity and slower hydration rate after calcination of the cement clinker, the addition of which provides long-lasting mechanical properties and durability, calcined C4The AF clinker mainly increases the medium strength (6-12 months), and the calcined C2S clinker provides long mechanical properties and durability (1 to decades), and over-burning C2S and C4An interface-free transition area can be formed between the AF clinker particles and the cement hardened body, so that invasion and damage of harmful ions can be reduced, and the strength and durability of the whole life cycle can be maintained and improved.
(3) The grading nano material adopted by the invention is compounded by different grading grain sizes, can fill the pore structure of the cement-based material in a grading way, reduces the early-stage sample porosity, reduces the number of intercommunicating pores, enhances the mechanical property, and can play a good role under the condition of low mixing amount.
(4) In the invention, the components such as hydroxy alumina in the nano boehmite and the components such as calcium hydroxide and calcium sulfate in the cement are utilized to generate the alumina gel, so that more ettringite crystals are formed, and the early-stage skeleton of the cement-based material is enhanced; the components of silicon dioxide, aluminum oxide and the like in the superfine zeolite can also react with the components of the cement-based material to generate a certain amount of C-S-H gel and ettringite crystals, so that the addition of the nano material in the cement-based material can also partially participate in cement hydration besides the functions, the compactness of the product is improved again, and the structure of the cement body is compacted. And the added nano materials with different particle sizes provide good early-stage mechanical property under the action of the nano dispersant, the sulphoaluminate cement and the early strength agent, and the compactness of an early-stage cement hardened body is improved.
Drawings
FIG. 1 shows a high-compactness cement-based material test block applied to an airport pavement prepared in the first embodiment of the invention.
Detailed Description
The present invention is further described in the following examples, which are intended to be illustrative only and not to be limiting as to the scope of the invention, wherein the preferred methods and materials are set forth in the following examples, which are intended to be illustrative only and are to be construed in detail.
In the following examples, portland cement of strength grade 42.5 is used. The sulphoaluminate cement used is sulphoaluminate cement with the strength grade of 42.5.
In the following examples, the paper sludge ash used was from Chuan environmental protection Co.
First embodiment
1. Preparation of calcined papermaking sludge ash
Cleaning the papermaking sludge ash with clear water to remove certain impurities, grinding, and sieving with a 100-mesh sieve to obtain a residue of less than 1 wt%; then placing the mixture in a drying oven at 40 ℃ for drying; and finally, placing the dried sample in a silicon-molybdenum rod high-temperature furnace, and calcining for 1h at 550 ℃ in the air. And (3) sieving the obtained calcined papermaking sludge ash with a 200-mesh sieve, wherein the screen residue is less than 1% for later use.
2. Preparation of modified cement
And adding 75 parts by weight of Portland cement, 17 parts by weight of sulphoaluminate cement and 8 parts by weight of calcined papermaking sludge ash into a VH type mixer, and stirring for 8 hours to obtain the cement.
3. Preparation of overburning cement clinker
The materials of limestone and clay, etc. are crushed, homogenized and washed by conventional production method of silicate cement, then the above-mentioned materials are passed through such processes of pulverizing, homogenizing and washingDrying until the water content is lower than 1 wt%, pressing the mixed material into round blocks with the diameter of 60mm and the thickness of 10mm, placing the prepared round blocks in a drying oven for drying at 100 ℃, calcining the round blocks at 1250 ℃ for 40min after the drying, naturally cooling to room temperature, and sieving to obtain C with the particle size of 200-350 um2And (5) S clinker.
Similarly, the calcined C is prepared from materials such as limestone, steel slag, aluminum slag and the like under the conditions4AF clinker.
80 parts by weight of C2S clinker and 20 weight portions of C4And uniformly mixing the AF clinker to obtain the overburning cement clinker.
4. Preparation of graded nano material
Adding 50 parts by weight of boehmite with the particle size of 30-80 nm, 30 parts by weight of ultrafine zeolite with the particle size of 80-200 nm and 20 parts by weight of ultrafine shell powder with the particle size of 200-400 nm into a VH type mixer, stirring for 8 hours, and uniformly mixing to obtain the nano-boehmite nano-alumina material.
5. Preparation of high-compactness cement-based material applied to airport pavement
(1) Weighing the following raw materials in parts by weight: 95 parts of modified cement, 1.2 parts of graded nano material, 0.05 part of nano dispersant, 0.8 part of water reducing agent, 0.4 part of early strength agent, 2.55 parts of calcined cement clinker particles and 500 parts of aggregate (150 parts of sand and 350 parts of stone) according to the proportion of 0.21 of water-cement ratio. Wherein: the nano dispersing agent is 20 type nonionic surfactant, and is formed by ethoxylation of sorbitol fatty acid ester. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent. The early strength agent consists of 70 parts by weight of calcium formate and 30 parts by weight of aluminum sulfate.
(2) Adding the nano dispersing agent into water, adding the graded nano material, placing the graded nano material in an ultrasonic disperser for ultrasonic treatment for 30min, adding the water reducing agent and the early strength agent, and continuously mixing uniformly to obtain a mixture A.
(3) Adding the modified cement, the overburnt cement clinker particles, the aggregate and the mixture A into a stirrer to stir for 15min to obtain concrete slurry, and curing the slurry to a preset age according to the technical specification of civil airport cement concrete surface layer construction (MH 5006-2015), thus obtaining the cement mortar.
Second embodiment
1. Preparation of calcined papermaking sludge ash
Cleaning the papermaking sludge ash with clear water to remove certain impurities, grinding, and sieving with a 100-mesh sieve to obtain a residue of less than 1 wt%; then placing the mixture in a drying oven at 40 ℃ for drying; and finally, placing the dried sample in a silicon-molybdenum rod high-temperature furnace, and calcining for 70min at 500 ℃ in the air. And (3) sieving the obtained calcined papermaking sludge ash with a 200-mesh sieve, wherein the screen residue is less than 1% for later use.
2. Preparation of modified cement
Taking 70 parts by weight of Portland cement, 20 parts by weight of sulphoaluminate cement and 10 parts by weight of calcined papermaking sludge ash, adding the three components into a VH type mixer, and stirring for 8 hours to obtain the cement.
3. Preparation of overburning cement clinker
Crushing, homogenizing and washing materials such as limestone and clay according to a conventional production method of portland cement, drying until the water content is lower than 1 wt%, pressing the mixed materials into round blocks with the diameter of 60mm and the thickness of 10mm, drying the prepared round blocks in a drying oven at 100 ℃, calcining the round blocks at 1230 ℃ for 50min after the round blocks are finished, naturally cooling to room temperature, and sieving to obtain C with the particle size of 100-150 um2And (5) S clinker.
Similarly, the calcined C is prepared from materials such as limestone, steel slag, aluminum slag and the like under the conditions4AF clinker.
70 parts by weight of C2S clinker and 30 parts by weight of C4And uniformly mixing the AF clinker to obtain the overburning cement clinker.
4. Preparation of graded nano material
Adding 40 parts by weight of boehmite with the particle size of 30-80 nm, 50 parts by weight of ultrafine zeolite with the particle size of 80-200 nm and 10 parts by weight of ultrafine shell powder with the particle size of 200-400 nm into a VH type mixer, stirring for 8 hours, and uniformly mixing to obtain the nano-boehmite nano-alumina material.
5. Preparation of high-compactness cement-based material applied to airport pavement
(1) Weighing the following raw materials in parts by weight: 92 parts of modified cement, 1.5 parts of graded nano material, 0.01 part of nano dispersant, 0.4 part of water reducing agent, 0.5 part of early strength agent, 5.6 parts of calcined cement clinker particles and 450 parts of aggregate (sand 160 parts and pebble 290 parts), and water is taken according to the proportion of the water-cement ratio of 0.23. Wherein: the nano dispersing agent is 20 type nonionic surfactant, and is formed by ethoxylation of sorbitol fatty acid ester. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent. The early strength agent consists of 60 parts by weight of calcium formate and 40 parts by weight of aluminum sulfate.
(2) Adding the nano dispersing agent into water, adding the graded nano material, placing the graded nano material in an ultrasonic disperser for ultrasonic treatment for 30min, adding the water reducing agent and the early strength agent, and continuously mixing uniformly to obtain a mixture A.
(3) Adding the modified cement, the overburnt cement clinker particles, the aggregate and the mixture A into a stirrer to be stirred for 18min to obtain concrete slurry, and curing the slurry to a preset age according to the technical specification of civil airport cement concrete surface layer construction (MH 5006-2015), thus obtaining the cement mortar.
Third embodiment
1. Preparation of calcined papermaking sludge ash
Cleaning the papermaking sludge ash with clear water to remove certain impurities, grinding, and sieving with a 100-mesh sieve to obtain a residue of less than 1 wt%; then placing the mixture in a drying oven at 40 ℃ for drying; and finally, placing the dried sample in a silicon-molybdenum rod high-temperature furnace, and calcining for 50min at 580 ℃ in the air. And (3) sieving the obtained calcined papermaking sludge ash with a 200-mesh sieve, wherein the screen residue is less than 1% for later use.
2. Preparation of modified cement
And adding 80 parts by weight of Portland cement, 10 parts by weight of sulphoaluminate cement and 10 parts by weight of calcined papermaking sludge ash into a VH type mixer, and stirring for 8 hours to obtain the cement.
3. Preparation of overburning cement clinker
Crushing, homogenizing and washing materials such as limestone and clay according to a conventional production method of portland cement, drying until the water content is lower than 1 wt%, pressing the mixed materials into round blocks with the diameter of 60mm and the thickness of 10mm, and drying the prepared round blocksDrying at 100 ℃ in a box, calcining the round block at 1300 ℃ for 30min after the drying, naturally cooling to room temperature, and sieving to obtain C with the particle size of 100-300 um2And (5) S clinker.
Similarly, the calcined C is prepared from materials such as limestone, steel slag, aluminum slag and the like under the conditions4AF clinker.
60 parts by weight of C2S clinker and 40 weight portions of C4And uniformly mixing the AF clinker to obtain the overburning cement clinker.
4. Preparation of graded nano material
Adding 30 parts by weight of boehmite with the particle size of 30-80 nm, 20 parts by weight of ultrafine zeolite with the particle size of 80-200 nm and 50 parts by weight of ultrafine shell powder with the particle size of 200-400 nm into a VH type mixer, stirring for 8 hours, and uniformly mixing to obtain the nano-boehmite nano-alumina material.
5. Preparation of high-compactness cement-based material applied to airport pavement
(1) Weighing the following raw materials in parts by weight: 97 parts of modified cement, 0.5 part of graded nano material, 0.1 part of nano dispersant, 1.2 parts of water reducing agent, 0.2 part of early strength agent, 1.0 part of calcined cement clinker particles and 388 parts of aggregate (168 parts of sand and 220 parts of stone) in total, and water is taken according to the proportion of 0.25 of water-cement ratio. Wherein: the nano dispersing agent is 20 type nonionic surfactant, and is formed by ethoxylation of sorbitol fatty acid ester. The water reducing agent is a naphthalene-based high-efficiency water reducing agent. The early strength agent consists of 60 parts by weight of calcium formate and 40 parts by weight of aluminum sulfate.
(2) Adding the nano dispersing agent into water, adding the graded nano material, placing the graded nano material in an ultrasonic disperser for ultrasonic treatment for 30min, adding the water reducing agent and the early strength agent, and continuously mixing uniformly to obtain a mixture A.
(3) Adding the modified cement, the overburnt cement clinker particles, the aggregate and the mixture A into a stirrer to be stirred for 18min to obtain concrete slurry, and curing the slurry to a preset age according to the technical specification of civil airport cement concrete surface layer construction (MH 5006-2015), thus obtaining the cement mortar.
Fourth embodiment
1. Preparation of calcined papermaking sludge ash
Cleaning the papermaking sludge ash with clear water to remove certain impurities, grinding, and sieving with a 100-mesh sieve to obtain a residue of less than 1 wt%; then placing the mixture in a drying oven at 40 ℃ for drying; and finally, placing the dried sample in a silicon-molybdenum rod high-temperature furnace, and calcining for 40min at 600 ℃ in the air. And (3) sieving the obtained calcined papermaking sludge ash with a 200-mesh sieve, wherein the screen residue is less than 1% for later use.
2. Preparation of modified cement
Taking 85 parts by weight of Portland cement, 5 parts by weight of sulphoaluminate cement and 12 parts by weight of calcined papermaking sludge ash, adding the three components into a VH type mixer, and stirring for 8 hours to obtain the cement.
3. Preparation of overburning cement clinker
Crushing, homogenizing and washing materials such as limestone and clay according to a conventional production method of portland cement, drying until the water content is lower than 1 wt%, pressing the mixed material into round blocks with the diameter of 60mm and the thickness of 10mm, drying the prepared round blocks in a drying oven at 100 ℃, calcining the round blocks at 1200 ℃ for 60min after the round blocks are finished, naturally cooling to room temperature, and sieving to obtain C with the particle size of 400-500 um2And (5) S clinker.
Similarly, the calcined C is prepared from materials such as limestone, steel slag, aluminum slag and the like under the conditions4AF clinker.
50 parts by weight of C2S clinker and 50 parts by weight of C4And uniformly mixing the AF clinker to obtain the overburning cement clinker.
4. Preparation of graded nano material
Adding 30 parts by weight of boehmite with the particle size of 30-80 nm, 20 parts by weight of ultrafine zeolite with the particle size of 80-200 nm and 50 parts by weight of ultrafine shell powder with the particle size of 200-400 nm into a VH type mixer, stirring for 8 hours, and uniformly mixing to obtain the nano-boehmite nano-alumina material.
5. Preparation of high-compactness cement-based material applied to airport pavement
(1) Weighing the following raw materials in parts by weight: 94 parts of modified cement, 0.6 part of graded nano material, 0.08 part of nano dispersant, 1.0 part of water reducing agent, 0.3 part of early strength agent, 4.2 parts of calcined cement clinker particles and 564 parts of aggregate (150 parts of sand and 314 parts of stone) are taken according to the proportion of the water-cement ratio of 0.18. Wherein: the nano dispersing agent is 20 type nonionic surfactant, and is formed by ethoxylation of sorbitol fatty acid ester. The water reducing agent is a naphthalene-based high-efficiency water reducing agent. The early strength agent is composed of 50 parts by weight of calcium formate and 50 parts by weight of aluminum sulfate.
(2) Adding the nano dispersing agent into water, adding the graded nano material, placing the graded nano material in an ultrasonic disperser for ultrasonic treatment for 30min, adding the water reducing agent and the early strength agent, and continuously mixing uniformly to obtain a mixture A.
(3) Adding the modified cement, the overburnt cement clinker particles, the aggregate and the mixture A into a stirrer to stir for 15min to obtain concrete slurry, and curing the slurry to a preset age according to the technical specification of civil airport cement concrete surface layer construction (MH 5006-2015), thus obtaining the cement mortar.
Fifth embodiment
1. Preparation of calcined papermaking sludge ash
Cleaning the papermaking sludge ash with clear water to remove certain impurities, grinding, and sieving with a 100-mesh sieve to obtain a residue of less than 1 wt%; then placing the mixture in a drying oven at 40 ℃ for drying; and finally, placing the dried sample in a silicon-molybdenum rod high-temperature furnace, and calcining for 1h at 550 ℃ in the air. And (3) sieving the obtained calcined papermaking sludge ash with a 200-mesh sieve, wherein the screen residue is less than 1% for later use.
2. Preparation of modified cement
And adding 72 parts by weight of Portland cement, 6 parts by weight of sulphoaluminate cement and 5 parts by weight of calcined papermaking sludge ash into a VH type mixer, and stirring for 8 hours to obtain the cement.
3. Preparation of overburning cement clinker
Crushing, homogenizing and washing materials such as limestone and clay according to a conventional production method of portland cement, drying until the water content is lower than 1 wt%, pressing the mixed materials into round blocks with the diameter of 60mm and the thickness of 10mm, drying the prepared round blocks in a drying oven at 100 ℃, calcining the round blocks at 1280 ℃ for 35min after the round blocks are finished, naturally cooling to room temperature, and sieving to obtain the material with the particle size of 130-180 mu mC of2And (5) S clinker.
Similarly, the calcined C is prepared from materials such as limestone, steel slag, aluminum slag and the like under the conditions4AF clinker.
65 parts by weight of C2S clinker and 35 weight portions of C4And uniformly mixing the AF clinker to obtain the overburning cement clinker.
4. Preparation of graded nano material
Adding 45 parts by weight of boehmite with the particle size of 30-80 nm, 35 parts by weight of 80-200 nm ultrafine zeolite and 35 parts by weight of 200-400 nm ultrafine shell powder into a VH type mixer, stirring for 8 hours, and uniformly mixing to obtain the nano-boehmite nano-zeolite nano-powder.
5. Preparation of high-compactness cement-based material applied to airport pavement
(1) Weighing the following raw materials in parts by weight: 95 parts of modified cement, 1.2 parts of graded nano material, 0.07 part of nano dispersant, 0.9 part of water reducing agent, 0.3 part of early strength agent, 3.7 parts of calcined cement clinker particles and 530 parts of aggregate (sand 135 parts and carpolite 295 parts), and water is taken according to the proportion of the water-cement ratio of 0.20. Wherein: the nano dispersing agent is 20 type nonionic surfactant, and is formed by ethoxylation of sorbitol fatty acid ester. The water reducing agent is an aliphatic high-efficiency water reducing agent. The early strength agent is calcium formate.
(2) Adding the nano dispersing agent into water, adding the graded nano material, placing the graded nano material in an ultrasonic disperser for ultrasonic treatment for 30min, adding the water reducing agent and the early strength agent, and continuously mixing uniformly to obtain a mixture A.
(3) Adding the modified cement, the overburnt cement clinker particles, the aggregate and the mixture A into a stirrer to stir for 20min to obtain concrete slurry, and curing the slurry to a preset age according to the technical specification of civil airport cement concrete surface layer construction (MH 5006-2015), thus obtaining the cement mortar.
Sixth embodiment
The preparation method of the high-compactness cement-based material applied to the airport pavement is different from that of the first embodiment in that: this example uses ordinary portland cement instead of the modified cement. Specifically, the preparation method comprises the following steps:
(1) weighing the following raw materials in parts by weight: 95 parts of ordinary portland cement, 1.2 parts of graded nano material, 0.05 part of nano dispersant, 0.8 part of water reducing agent, 0.4 part of early strength agent, 2.55 parts of calcined cement clinker particles and 500 parts of aggregate (150 parts of sand and 350 parts of stone) according to the proportion of 0.21 of water-cement ratio. Wherein: the nano dispersing agent is 20 type nonionic surfactant, and is formed by ethoxylation of sorbitol fatty acid ester. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent. The early strength agent consists of 70 parts by weight of calcium formate and 30 parts by weight of aluminum sulfate.
(2) Adding the nano dispersing agent into water, adding the graded nano material, placing the graded nano material in an ultrasonic disperser for ultrasonic treatment for 30min, adding the water reducing agent and the early strength agent, and continuously mixing uniformly to obtain a mixture A.
(3) Adding the modified cement, the overburnt cement clinker particles, the aggregate and the mixture A into a stirrer to stir for 15min to obtain concrete slurry, and curing the slurry to a preset age according to the technical specification of civil airport cement concrete surface layer construction (MH 5006-2015), thus obtaining the cement mortar.
Seventh embodiment
The preparation method of the high-compactness cement-based material applied to the airport pavement is different from that of the first embodiment in that: the modified cement in this example was not subjected to calcination treatment and other modification treatment. Specifically, the preparation method comprises the following steps:
(1) weighing the following raw materials in parts by weight: 95 parts of modified cement, 1.2 parts of graded nano material, 0.05 part of nano dispersant, 0.8 part of water reducing agent, 0.4 part of early strength agent, 2.55 parts of calcined cement clinker particles and 500 parts of aggregate (150 parts of sand and 350 parts of stone) according to the proportion of 0.21 of water-cement ratio. Wherein: the nano dispersing agent is 20 type nonionic surfactant, and is formed by ethoxylation of sorbitol fatty acid ester. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent. The early strength agent consists of 70 parts by weight of calcium formate and 30 parts by weight of aluminum sulfate.
(2) Adding the nano dispersing agent into water, adding the graded nano material, placing the graded nano material in an ultrasonic disperser for ultrasonic treatment for 30min, adding the water reducing agent and the early strength agent, and continuously mixing uniformly to obtain a mixture A.
(3) Adding the modified cement, the overburnt cement clinker particles, the aggregate and the mixture A into a stirrer to stir for 15min to obtain concrete slurry, and curing the slurry to a preset age according to the technical specification of civil airport cement concrete surface layer construction (MH 5006-2015), thus obtaining the cement mortar.
Eighth embodiment
The preparation method of the high-compactness cement-based material applied to the airport pavement is different from that of the first embodiment in that: the present example did not employ over-fired cement clinker particles. Specifically, the preparation method comprises the following steps:
(1) weighing the following raw materials in parts by weight: 95 parts of modified cement, 1.2 parts of graded nano material, 0.05 part of nano dispersant, 0.8 part of water reducing agent and 0.4 part of early strength agent, wherein water is taken according to the proportion of 0.21 of water-cement ratio, and the aggregate is 500 parts (150 parts of sand and 350 parts of stones). Wherein: the nano dispersing agent is 20 type nonionic surfactant, and is formed by ethoxylation of sorbitol fatty acid ester. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent. The early strength agent consists of 70 parts by weight of calcium formate and 30 parts by weight of aluminum sulfate.
(2) Adding the nano dispersing agent into water, adding the graded nano material, placing the graded nano material in an ultrasonic disperser for ultrasonic treatment for 30min, adding the water reducing agent and the early strength agent, and continuously mixing uniformly to obtain a mixture A.
(3) Adding the modified cement, the overburnt cement clinker particles, the aggregate and the mixture A into a stirrer to stir for 15min to obtain concrete slurry, and curing the slurry to a preset age according to the technical specification of civil airport cement concrete surface layer construction (MH 5006-2015), thus obtaining the cement mortar.
Ninth embodiment
The preparation method of the high-compactness cement-based material applied to the airport pavement is different from that of the first embodiment in that: in the embodiment, the cement clinker particles are not subjected to high-temperature overburning treatment, and are not subjected to other treatments. Specifically, the preparation method comprises the following steps:
(1) weighing the following raw materials in parts by weight: 95 parts of ordinary portland cement, 1.2 parts of graded nano material, 0.05 part of nano dispersant, 0.8 part of water reducing agent, 0.4 part of early strength agent, 2.55 parts of cement clinker particles and 500 parts of aggregate (150 parts of sand and 350 parts of stone) according to the proportion of 0.21 of water-cement ratio. Wherein: the nano dispersing agent is 20 type nonionic surfactant, and is formed by ethoxylation of sorbitol fatty acid ester. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent. The early strength agent consists of 70 parts by weight of calcium formate and 30 parts by weight of aluminum sulfate.
(2) Adding the nano dispersing agent into water, adding the graded nano material, placing the graded nano material in an ultrasonic disperser for ultrasonic treatment for 30min, adding the water reducing agent and the early strength agent, and continuously mixing uniformly to obtain a mixture A.
(3) Adding the modified cement, the overburnt cement clinker particles, the aggregate and the mixture A into a stirrer to stir for 15min to obtain concrete slurry, and curing the slurry to a preset age according to the technical specification of civil airport cement concrete surface layer construction (MH 5006-2015), thus obtaining the cement mortar.
Tenth embodiment
The preparation method of the high-compactness cement-based material applied to the airport pavement is different from that of the first embodiment in that: the graded nanomaterial was not used in this example. Specifically, the preparation method comprises the following steps:
(1) weighing the following raw materials in parts by weight: 95 parts of ordinary portland cement, 0.05 part of nano dispersant, 0.8 part of water reducer, 0.4 part of early strength agent, 2.55 parts of calcined cement clinker particles and 500 parts of aggregate (150 parts of sand and 350 parts of stones), and water is taken according to the water-cement ratio of 0.21. Wherein: the nano dispersing agent is 20 type nonionic surfactant, and is formed by ethoxylation of sorbitol fatty acid ester. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent. The early strength agent consists of 70 parts by weight of calcium formate and 30 parts by weight of aluminum sulfate.
(2) Adding the nano dispersing agent into water, adding the graded nano material, placing the graded nano material in an ultrasonic disperser for ultrasonic treatment for 30min, adding the water reducing agent and the early strength agent, and continuously mixing uniformly to obtain a mixture A.
(3) Adding the modified cement, the overburnt cement clinker particles, the aggregate and the mixture A into a stirrer to stir for 15min to obtain concrete slurry, and curing the slurry to a preset age according to the technical specification of civil airport cement concrete surface layer construction (MH 5006-2015), thus obtaining the cement mortar.
Eleventh embodiment
The preparation method of the high-compactness cement-based material applied to the airport pavement is different from that of the first embodiment in that: the graded nanomaterial of this example is: adding 50 parts by weight of nano silicon dioxide with the particle size of 30-80 nm, 30 parts by weight of nano calcium carbonate with the particle size of 80-200 nm and 20 parts by weight of nano titanium dioxide with the particle size of 200-400 nm into a VH type mixer, and stirring for 8 hours to mix uniformly to obtain the nano calcium carbonate.
Performance testing
The cement, gravel and other raw materials used in the experiment and the water cement ratio meet the requirements of the civil airport cement concrete surface layer construction technical specification (MH 5006-2015), and the cement-based material test blocks (refer to figure 1) cured for 7 days, 180 days and 720 days in the above examples are subjected to compressive strength and porosity tests according to the standard of the test method of the mechanical properties of the common concrete (GB/T50081-2002) and the test method of the long-term performance and durability of the common concrete (GB/T50082-2009), and the results are shown in Table 1.
TABLE 1
As can be seen from the test results in table 1, the structural density of the cement-based material prepared in the first to fifth examples is greatly reduced and the strength is significantly improved at each age, compared with the sixth to eleventh examples, which is mainly due to: the calcium aluminosilicate and the anhydrous type III calcium sulfate having higher activity in the calcined papermaking sludge ash of the first to fifth embodiments are reacted with the calcium hydroxide, the alumina cement, and other components in the cementMore ettringite crystals and C-S-H gel are generated, and the ettringite crystals, the C-S-H gel, the silicate cement and the sulphoaluminate cement act together to support and play an early structural framework; moreover, the graded nano material is formed by compounding different graded grain sizes, can fill the pore structure of the cement-based material in a grading way, reduce the porosity of the sample at the early stage, reduce the number of intercommunicating pores, enhance the mechanical property and can play a good role under the condition of low mixing amount; meanwhile, the components such as hydroxy alumina in the nano boehmite in the graded nano material and the components such as calcium hydroxide and calcium sulfate in the cement can also generate alumina gel to form more ettringite crystals and enhance the early-stage skeleton of the cement-based material; the components of silicon dioxide, aluminum oxide and the like in the superfine zeolite can also react with the components of the cement-based material to generate a certain amount of C-S-H gel and ettringite crystals, so that the addition of the nano material in the cement-based material can also partially participate in cement hydration besides the functions, the compactness of the product is improved again, and the structure of the cement body is compacted. And the added nano materials with different particle sizes provide good early-stage mechanical property under the action of the nano dispersant, the sulphoaluminate cement and the early strength agent, and the compactness of an early-stage cement hardened body is improved. The reduction in porosity of the 180 and 720 day samples was due to overfire C2S and C4The AF small particles can be continuously hydrated in a long age, provide long-term mechanical property and durability, and C4AF has obvious effects on improving the mechanical property of middle-stage hydration and reducing the porosity, so that the over-burnt C in the sample in 180 days4The samples with more AF have more obvious strength improvement and porosity reduction in the middle period, while C2S has obvious effect of improving the late hydration (720 days); therefore, the cement-based material can be continuously hydrated in the early stage, the middle stage and the later stage of service, and the compactness and the durability of the cement-based material are improved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The high-compactness cement-based material applied to the airport pavement is characterized by comprising the following raw materials in parts by weight: 92-97 parts of modified cement, 0.5-1.5 parts of graded nano material, 0.01-0.1 part of nano dispersant, 0.4-1.2 parts of water reducing agent, 0.2-0.5 part of early strength agent, 1-5.6 parts of calcined cement clinker particles and aggregate with the content of the modified cement being 4-6 times; wherein: the modified cement is composed of 70-85 parts of Portland cement, 5-20 parts of sulphoaluminate cement and 5-12 parts of calcined papermaking sludge ash.
2. The high-compactness cement-based material applied to airport pavement according to claim 1, wherein the calcined paper sludge ash is prepared by the following method: firstly, papermaking sludge ash is used, cleaned, crushed, sieved and dried, and finally calcined at 500-600 ℃ for 40-70 min.
3. The high-compactness cement-based material applied to the airport pavement according to claim 1, wherein the graded nano material is composed of 30-50 parts of nano boehmite, 20-50 parts of ultrafine zeolite and 10-50 parts of ultrafine shell powder by weight, and the particle sizes of the materials are respectively as follows: 30-80 nm of nano boehmite, 80-200 nm of superfine zeolite and 200-400 nm of superfine shell powder.
4. High-denseness cement-based material for airport pavement according to claim 1, wherein the particles of over-burned cement clinker are composed mainly of C2S clinker and C4Composition of AF clinker C2S clinker and C4The AF clinker is prepared by calcining corresponding cement production raw materials at 1200-1300 ℃ for 30-60 min respectively.
5. High-denseness cement-based material for airport pavement according to claim 4, wherein the high-denseness cement-based material is over-firedC in cement clinker particles2S clinker and C4The weight ratio of the AF clinker is (50-80): (20-50), and the grain diameter is controlled between 100-500 um.
6. The high-compactness cement-based material applied to airport pavements according to claim 1, wherein said early strength agent is calcium formate and/or aluminum sulfate.
7. The high-compactness cement-based material for airport pavement according to claim 1, wherein the nano dispersant comprises any one of a non-ionic surfactant and an ionic surfactant.
8. The high-compactness cement-based material applied to airport pavements according to claim 1, wherein the water reducing agent comprises any one of aliphatic, aromatic, naphthalene, and polycarboxylic acids.
9. The high-compactness cement-based material applied to airport pavement according to any one of claims 1-8, wherein the raw material of the cement-based material further comprises water, and the addition amount of the water is performed according to a water-cement ratio of 0.18-0.25.
10. The preparation method of the high-compactness cement-based material applied to the airport pavement is characterized by comprising the following steps of:
(1) adding 0.01-0.1 part by weight of nano dispersing agent and 0.5-1.5 parts by weight of graded nano material into water, mixing uniformly, adding 0.4-1.2 parts by weight of water reducing agent and 0.2-0.5 part by weight of early strength agent, and mixing uniformly to obtain a mixture A;
(2) adding 92-97 parts by weight of modified cement, 1-5.6 parts by weight of calcined cement clinker particles and aggregate into the mixture A, uniformly mixing, curing to obtain a target product,
the modified cement consists of 70-85 parts of Portland cement, 5-20 parts of sulphoaluminate cement and 5-12 parts of calcined papermaking sludge ash;
the using amount of the aggregate is 4-6 times of that of the modified cement;
the addition amount of water is performed according to a water-cement ratio of 0.18-0.25.
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