CN107056225A - A kind of phosphate cement based patching material and preparation method thereof - Google Patents

A kind of phosphate cement based patching material and preparation method thereof Download PDF

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Publication number
CN107056225A
CN107056225A CN201710237230.3A CN201710237230A CN107056225A CN 107056225 A CN107056225 A CN 107056225A CN 201710237230 A CN201710237230 A CN 201710237230A CN 107056225 A CN107056225 A CN 107056225A
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phosphate cement
parts
patching material
cement based
based patching
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谭洪波
尹轮
李相国
刘卓霖
杨蓉
明添
笪俊伟
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/34Compositions 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 cold phosphate binders
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/20Retarders
    • C04B2103/22Set retarders
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075Uses not provided for elsewhere in C04B2111/00 for road construction
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/72Repairing or restoring existing buildings or building materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The present invention relates to a kind of phosphate cement based patching material and preparation method thereof, it is composed of the following components by weight:100 parts of magnesium phosphate cement, 20 40 parts of mineral admixture, 120 140 parts of fine aggregate, 0.5 1 parts of waterglass, 0.5 1 parts of fiber, 20 30 parts of water.Its preparation method is:Raw material is weighed by proportioning, first by magnesia, potassium dihydrogen phosphate, compound retarder mix it is uniform after obtain magnesium phosphate cement, then mineral admixture, fine aggregate are added, mix is uniformly added waterglass, fiber and water and stirred 34 minutes using mixer afterwards obtains phosphate cement based patching material.Phosphate cement based patching material prepared by the present invention, reparation needed the time short and did not influenceed construction, and repairing effect is notable at 30 minutes or so setting time, meet the application requirement of Rapid-Repair damaged road surface, it is adaptable to the QFE of cement concrete pavement.

Description

A kind of phosphate cement based patching material and preparation method thereof
Technical field
The invention belongs to Cement Concrete Pavement Reconstruction technical field, and in particular to a kind of phosphate cement based patching material And preparation method thereof.
Background technology
Nowadays with the high speed development of economic construction, transportation is also flourished, due to coagulating cement Soil surface has higher intensity in itself, larger rigidity, good volume stability and excellent load diffusivity, durable Property etc. so that cement concrete pavement occupies great proportion in highway construction.But its fragility is big, easy to crack also to coagulation The normal traffic of soil surface and maintenance bring many troubles.Under the influence of the reloading and environmental factor of vehicle, cement Concrete starts the small diseases such as crack, undisguised, pitted skin occur, as handled not in time, is likely to result in even more serious knot Structure is destroyed, and can not only bring not smooth to normal traffic, or even influence traffic safety.In order to reduce economic loss, society's warp is improved Ji benefit, in the case where shortening the Traffic interruption time as far as possible, Rapid-Repair road surface is also just into the weight of road surface Development Technology In it is weight.
Phosphate cement sill, is to be formed by metal oxide and acid phosphate by acid-base neutralization reaction with phosphoric acid Salt is the inorganic coagulation material for cohering phase, and acid phosphate is mixed by one or both of ammonium dihydrogen phosphate, potassium dihydrogen phosphate etc. Salt, magnesia powder, retarder and admixture etc. are prepared from, and can quickly react to be formed with height in the case where water is as medium By force, the binder materials of the premium properties such as fast solidifying, salt resistance, freeze proof, wear-resisting and acid corrosion-resistant, for the native patching material tool of rapid coagulation Hold out broad prospects.
Chinese patent CN102505601A discloses a kind of fast repairing method for asphalt concrete pavement, using following quality The material of part proportioning:1-40 parts of magnesium phosphate cement;10-30 parts of the rubble of 5-10mm particle diameters;The rubble 20-40 of 11-16mm particle diameters Part;Less than 20-50 parts of the aggregate chips of 5mm particle diameters;Middle sand 5-15 parts;0-10 parts of miberal powder;Emulsified asphalt adds according to bitumen aggregate ratio 4~10% Plus, wherein magnesium phosphate cement is according to ammonium dihydrogen phosphate, magnesia, borax mass ratio 1:(1-6):(0.1-0.6) mix it is uniform and Into.This method is due to using ammonium dihydrogen phosphate, and reaction produces irritative gas ammonia, the problem of there is pollution environment.
The patching material and cement concrete pavement that Chinese patent CN105294049A discloses a kind of special cement base are fast Method is repaiied, the patching material includes the component of following parts by weight:30-80 parts of magnesium phosphate cement, 10-30 parts of sulphate aluminium cement, 0.1-0.5 parts of early strength agent, 0.2-0.5 parts of water reducer, 0.2-2 parts of redispersable latex powder, 2-10 parts of flyash, diamond dust 10- 25 parts, 10-25 parts of fine sand, 5-50 parts of rubble, 0.5-2 parts of carbon fiber, 1-5 parts of soluble polyurethane.The mechanics of the patching material Performance, abrasion resistance, water impermeability and endurance quality etc. are satisfied by application requirement, but the presetting period only has 8-14 points , there is setting time too short in clock, it is not easy to the problem of regulating and controlling.
The content of the invention
The technical problems to be solved by the invention are that there is provided a kind of phosphate for above shortcomings in the prior art Cement based patching material and preparation method thereof, prepares that setting time is moderate using magnesium phosphate cement as base material, mechanical property, water-fast Performance etc. is satisfied by the fast repairing material of application requirement.
In order to solve the above technical problems, the technical scheme that the present invention is provided is:
A kind of phosphate cement based patching material is provided, it is composed of the following components by weight:Magnesium phosphate cement 100 Part, 20-40 parts of mineral admixture, 120-140 parts of fine aggregate, 0.5-1 parts of waterglass, 0.5-1 parts of fiber, 20-30 parts of water;
The magnesium phosphate cement is by mass percentage, multiple by 56-66% magnesia, 30-40% potassium dihydrogen phosphates, 3-4% Close retarder composition.
By such scheme, by magnesite, the grinding after 1600-1700 DEG C of calcining is formed the magnesia, and quality purity is more than 90%, 200 mesh screen residues are less than 10%.
By such scheme, the potassium dihydrogen phosphate quality purity is more than 96%, and granularity is 245-350 μm.
By such scheme, the mineral admixture is II grades of flyash, and density is 2.60-2.75g/cm3, specific surface area is 3500-4000cm2/g。
By such scheme, the fine aggregate is one or both of quartz sand or river sand, and modulus of fineness is 2.2-2.8.
By such scheme, the fiber is one or both of polypropylene fibre, vinal, and average length is 12mm。
By such scheme, the modulus of water glass is 2.2-2.8.
By such scheme, the compound retarder presses quality by borax, disodium hydrogen phosphate dodecahydrate and anhydrous calcium chloride Than 2:2:1 is mixed to get, and three's purity is all higher than 95%.
The present invention also provides the preparation method of above-mentioned phosphate cement based patching material, and its step is as follows:Weighed by proportioning Raw material, first by magnesia, potassium dihydrogen phosphate, compound retarder mix it is uniform after obtain magnesium phosphate cement, then add mineral mix Material, fine aggregate are closed, mix uniformly adds waterglass, fiber and water and obtains phosphoric acid salt solution within 3-4 minutes using mixer stirring afterwards Mud based patching material.
The method that the present invention also provides above-mentioned phosphate cement based patching material Rapid-Repair road surface, its step is as follows:
1) damaged road surface is cleared up:Breakage is cut with cutting machine first, then with pneumatic pick to repairing in the range of Existing cement-concrete pavement is purged and chipping, carries out dabbing and using wire brush to discrete particles and silt to repairing interface afterwards Scrubbed, to ensure that adhesive surface is cleaned;
2) pour:The phosphate cement based patching material mixed is poured on the damaged road surface cleared up, tamping paving Maintenance can be open to traffic after 2-3 hours after flat.
Phosphate cement material is to be formed by metal oxide and acid phosphate by acid-base neutralization reaction with phosphate To cohere the inorganic coagulation material of phase.Due to the unique acid-base neutralization reaction mechanism of magnesium phosphate cement, its setting time is determined It is short, hardening can be just condensed within a few minutes, hour intensity can reach more than 20MPa;Magnesium phosphate cement can be at normal temperatures The characteristic of its rapid hardening high-strength is kept, hardening can be equally condensed rapidly in subzero temperature environment, and heat-resisting quantity is good.Use magnesium phosphate water Mud repairs old concrete, not only has mechanical interlocking, Van der Waals force at adhesive surface, and can also be produced with aquation in old concrete Chemical reaction generation magnesium phosphate class product occurs for thing and unhydrated cement granules, with very strong chemical bonding effect.Use phosphorus Sour magnesium cement configures mortar, and shrinkage factor only has 1/10th of normal concrete or so;Magnesium phosphate cement is starched even certain only Expansion is shown as in time.Containing a large amount of unhydrated magnesium oxide particles in magnesium phosphate cement stone, the magnesia after these reheatings Grain structure is fine and close, hardness is high, so its wearability is fine.
The beneficial effects of the present invention are:1st, by the present invention in that with borax, disodium hydrogen phosphate dodecahydrate, anhydrous chlorination Compound retarder prepared by calcium, on the one hand can hydrolyze the B produced using borax4O7 2-Complex compound is coated on MgO surfaces and hindered Outside MgO hydrolysis and then suppression hydration reaction, another aspect disodium hydrogen phosphate dodecahydrate absorbs substantial amounts of in course of dissolution Heat, reduces reacting initial temperature, furthermore disodium hydrogen phosphate dodecahydrate adheres to the acid salt of Multiple Weak Acid separately and its corresponding Secondary salt, can form buffer system, and the aqueous solution can improve the initial pH value of magnesia and phosphate reaction in alkalescent, cause The rate of dissolution of magnesium oxide particle slows down, and the hydration heat that its double action result in slows down, so that heat evolution velocity delays, can be with By adjusting setting time that the content of compound retarder effectively controls phosphate cement in the range of 10min-6h, solve The problems such as retarding effect finite sum poor operability;2nd, the present invention effectively improves phosphate cement by adding waterglass Water resistance, due to phosphate cement hardenite in the presence of water its hydrated product can continuous dissolution in the form of an ion so that So that its quality is constantly reduced, porosity increase, intensity declines.Waterglass and Mg2+Can occur in the environment of phosphate anti- Hydrated magnesium silicate gel should be formed, its water that can effectively fill outside the hole inside phosphate cement block, prevention enters In system, so as to effectively reduce the hydrolysis of unreacted phosphate and hydrated product, the influence to intensity is reduced.3rd, it is of the invention Mineral admixture is used as by the use of flyash, it is possible to use the active SiO in flyash2And Al2O3With the Ca in ordinary mortar (OH)2Reaction generation C-S-H gels so that the existing physical bond of adhesive surface, there is chemical bonding again, and adhesion strength is improved.
Embodiment
To make those skilled in the art more fully understand technical scheme, the present invention is made with reference to embodiment It is described in further detail.
Magnesia used in the embodiment of the present invention is technical pure, and by magnesite, grinding is formed after 1600-1700 DEG C of calcining, matter Measure purity and be more than 90%, 200 mesh screen residues are less than 10%;Potassium dihydrogen phosphate used is technical pure, and quality purity is more than 96%, granularity For 245-350 μm;Flyash used is II grades of flyash, and its density is 2.60-2.75g/cm3, specific surface area is 3500- 4000cm2/g;Gather materials use modulus of fineness for 2.38 common quartz sand;Modulus of water glass is 2.4.
Embodiment 1
A kind of phosphate cement based patching material, it is composed of the following components by weight:100 parts of magnesium phosphate cement, 20 parts of flyash, gathers materials 120 parts, 0.5 part of waterglass, 0.5 part of polypropylene fibre (average length 12mm), 20 parts of water.Wherein, phosphorus By 60% magnesia, 37% potassium dihydrogen phosphate, 3% compound retarder, (compound retarder presses matter to sour magnesium cement by mass percentage Amount ratio is made up of 40% borax, 40% disodium hydrogen phosphate dodecahydrate and 20% anhydrous calcium chloride, and three kinds are all that analysis is pure) mixing Form.
The phosphate cement based patching material is prepared from by following steps:Magnesia, phosphorus are weighed according to the above ratio Acid dihydride potassium, compound retarder mix uniformly obtain magnesium phosphate cement, then add mineral admixture by proportioning, gather materials, mix Waterglass, fiber and water are added after uniform and phosphate cement based patching material is obtained within 3-4 minutes using mixer stirring.
Method using phosphate cement based patching material manufactured in the present embodiment speed repairing road surface is as follows:First with cutting Machine is cut breakage, then the existing cement-concrete pavement in the range of repairing is purged and chipping with pneumatic pick, right afterwards Repairing interface is carried out dabbing and discrete particles and silt is scrubbed using wire brush, to ensure that adhesive surface is cleaned, and then will The phosphate cement based patching material mixed is poured on the damaged road surface cleared up, after tamping is conserved 2-3 hours after paving It can be open to traffic.
Embodiment 2
A kind of phosphate cement based patching material, it is composed of the following components by weight:100 parts of magnesium phosphate cement, 25 parts of flyash, gathers materials 125 parts, 0.8 part of waterglass, 1 part of polypropylene fibre (average length 12mm), 25 parts of water.Wherein, phosphoric acid By 66% magnesia, 30% potassium dihydrogen phosphate, 4% compound retarder, (compound retarder presses quality to magnesium cement by mass percentage Than being made up of 40% borax, 40% disodium hydrogen phosphate dodecahydrate and 20% anhydrous calcium chloride, three kinds be all analysis it is pure) mixing and Into.
The phosphate cement based patching material is prepared from by following steps:Magnesia, phosphorus are weighed according to the above ratio Acid dihydride potassium, compound retarder mix uniformly obtain magnesium phosphate cement, then add mineral admixture, sand by the proportioning, mix Close uniform rear addition waterglass, fiber and water and obtain phosphate cement based patching material within 3-4 minutes using mixer stirring.
Embodiment 3
A kind of phosphate cement based patching material, it is composed of the following components by weight:100 parts of magnesium phosphate cement, 40 parts of flyash, gathers materials 140 parts, 1 part of waterglass, 0.5 part of vinal (average length 12mm), 28 parts of water.Wherein, phosphorus Sour magnesium cement is by mass percentage by 56% magnesia, 40% potassium dihydrogen phosphate, and (compound retarder presses matter to 4% compound retarder Amount ratio is made up of 40% borax, 40% disodium hydrogen phosphate dodecahydrate and 20% anhydrous calcium chloride, and three kinds are all that analysis is pure) mixing Form.
The phosphate cement based patching material is prepared from by following steps:Magnesia, phosphorus are weighed according to the above ratio Acid dihydride potassium, compound retarder mix uniformly obtain magnesium phosphate cement, then add mineral admixture, sand by the proportioning, mix Close uniform rear addition waterglass, fiber and water and obtain phosphate cement based patching material within 3-4 minutes using mixer stirring.
Embodiment 4
A kind of phosphate cement based patching material, it is composed of the following components by weight:100 parts of magnesium phosphate cement, 40 parts of flyash, gathers materials 140 parts, 1 part of waterglass, 0.5 part of vinal (average length 12mm), polypropylene fibre 0.5 Part, 30 parts of water.Wherein, magnesium phosphate cement is by mass percentage by 66% magnesia, 31% potassium dihydrogen phosphate, 3% compound slow setting Agent (is made up of, three kinds are all analysis 40% borax, 40% disodium hydrogen phosphate dodecahydrate and 20% anhydrous calcium chloride in mass ratio It is pure) mix.
The phosphate cement based patching material is prepared from by following steps:Magnesia, phosphorus are weighed according to the above ratio Acid dihydride potassium, compound retarder mix uniformly obtain magnesium phosphate cement, then add mineral admixture, sand by the proportioning, mix Close uniform rear addition waterglass, fiber and water and obtain phosphate cement based patching material within 3-4 minutes using mixer stirring.
Embodiment 5
The performance of phosphate cement based patching material prepared by testing example 1-4:
The measure of rupture strength, compression strength:Phosphate cement based patching material prepared by embodiment 1-4 is poured respectively Injection forming, is conserved, using GB/T17671-1999 respectively after the demoulding in normal temperature air environment and water《Strength of cement mortar is examined Proved recipe method (ISO methods)》Standard testing its rupture strength, compression strength, and test its in water under curing condition with normal temperature air Compression strength loss rate when being conserved under environment;
The measure of adhesion strength:By the ratio of mud=0.35, cement mortar rate=1:3, use PO425 cement to prepare specification for 40mm × 40mm × 160mm prism test specimen waits a point cutting as mark sand test specimen, standard curing 28d from centre.Wherein half is put Enter in mortar die trial, be molded with the phosphate cement based patching material prepared by embodiment 1-4, the interface for preparing new old mortar is glued Test specimen is tied, its rupture strength is measured after maintenance to corresponding age, adhesion strength is characterized with the rupture strength measured.
The measure of setting time:Using GB/T1346-2001《Cement normal consistency water consumption, setting time, stability inspection Proved recipe method》Test its setting time.The performance test results are shown in Table 1.
Table 1
From above experimental result, the phosphate cement based patching material prepared using the embodiment of the present invention, during condensation Between at 30 minutes or so, reparation needs the time short and does not influence construction, and 3h compression strength reaches more than 20MPa, later strength Also the requirement of fast repairing material can be met, and water resistance is excellent, repairing effect significantly, meets Rapid-Repair damaged road surface Application requirement, it is adaptable to the QFE of cement concrete pavement.In addition, the patching material does not need special maintainer Skill, such as watering or overlay film, only need natural curing, small to traffic impact, have in fast repairing material field wide Prospect.

Claims (10)

1. a kind of phosphate cement based patching material, it is characterised in that it is composed of the following components by weight:Magnesium phosphate water 100 parts of mud, 20-40 parts of mineral admixture, 120-140 parts of fine aggregate, 0.5-1 parts of waterglass, 0.5-1 parts of fiber, water 20-30 Part;
The magnesium phosphate cement is by mass percentage, compound slow by 56-66% magnesia, 30-40% potassium dihydrogen phosphates, 3-4% Solidifying agent composition.
2. phosphate cement based patching material according to claim 1, it is characterised in that the magnesia is existed by magnesite Grinding is formed after 1600-1700 DEG C of calcining, and quality purity is more than 90%, and 200 mesh screen residues are less than 10%.
3. phosphate cement based patching material according to claim 2, it is characterised in that the potassium dihydrogen phosphate quality is pure Degree is more than 96%, and granularity is 245-350 μm.
4. phosphate cement based patching material according to claim 1, it is characterised in that the mineral admixture is II grades Flyash, density is 2.60-2.75g/cm3, specific surface area is 3500-4000cm2/g。
5. phosphate cement based patching material according to claim 1, it is characterised in that the fine aggregate be quartz sand or One or both of river sand, modulus of fineness is 2.2-2.8.
6. phosphate cement based patching material according to claim 1, it is characterised in that the fiber be polypropylene fibre, One or both of vinal, average fiber length is 12mm.
7. phosphate cement based patching material according to claim 1, it is characterised in that the modulus of water glass is 2.2- 2.8。
8. phosphate cement based patching material according to claim 1, it is characterised in that the compound retarder by borax, Disodium hydrogen phosphate dodecahydrate and anhydrous calcium chloride in mass ratio 2:2:1 is mixed to get, and three's purity is all higher than 95%.
9. a kind of preparation method of any described phosphate cement based patching materials of claim 1-8, it is characterised in that step It is as follows:Weigh raw material by proportioning, first by magnesia, potassium dihydrogen phosphate, compound retarder mix it is uniform after obtain magnesium phosphate cement, Then mineral admixture, fine aggregate are added, mix uniformly adds waterglass, fiber and water and utilizes 3-4 points of mixer stirring afterwards Clock obtains phosphate cement based patching material.
10. a kind of method on any described phosphate cement based patching material Rapid-Repair road surfaces of utilization claim 1-8, its It is characterised by that step is as follows:
1) damaged road surface is cleared up:Breakage is cut with cutting machine first, then with pneumatic pick to old mixed in the range of repairing Solidifying soil surface is purged and chipping, carries out dabbing to repairing interface afterwards and discrete particles and silt are carried out using wire brush Scrub, to ensure that adhesive surface is cleaned;
2) pour:The phosphate cement based patching material mixed is poured on the damaged road surface cleared up, after tamping is paved Maintenance can be open to traffic after 2-3 hours.
CN201710237230.3A 2017-04-12 2017-04-12 A kind of phosphate cement based patching material and preparation method thereof Pending CN107056225A (en)

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CN114315308A (en) * 2021-12-20 2022-04-12 长安大学 Ground coal gasification crude slag doped concrete rapid repair material, preparation method and application
CN114773025A (en) * 2022-04-24 2022-07-22 中国科学院武汉岩土力学研究所 Building damage repairing material, preparation method and repairing method thereof
CN114873986A (en) * 2022-06-23 2022-08-09 重庆永固新型建材有限公司 Cement-based crack repair slurry and preparation method thereof
CN115142053A (en) * 2022-07-26 2022-10-04 重庆大学 Surface treatment method for steel bridge deck or steel structural member
CN115304347A (en) * 2022-07-18 2022-11-08 山东大学 Composite material for repairing asphalt pavement cracks and preparation process thereof
CN115340355A (en) * 2022-09-23 2022-11-15 太原理工大学 High-ductility magnesium phosphate cement-based rapid repair material and preparation method thereof
CN115448687A (en) * 2022-10-18 2022-12-09 中铁第四勘察设计院集团有限公司 Magnesium ammonium phosphate cement-based composite material and preparation method and application thereof

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