CN108658550A - A kind of cement base mending mortar and preparation method thereof - Google Patents
A kind of cement base mending mortar and preparation method thereof Download PDFInfo
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- CN108658550A CN108658550A CN201810538145.5A CN201810538145A CN108658550A CN 108658550 A CN108658550 A CN 108658550A CN 201810538145 A CN201810538145 A CN 201810538145A CN 108658550 A CN108658550 A CN 108658550A
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- mending mortar
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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
- C04B20/10—Coating or impregnating
-
- 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
- C04B28/34—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 cold phosphate binders
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
-
- 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
Abstract
The invention discloses a kind of cement base mending mortars and preparation method thereof, belong to concrete field.Present invention water intaking is stirred with composition polymer, additive, is stood, is added remaining water, cement, early strength agent, water-reducing agent, aggregate, is uniformly mixed to get cement base mending mortar.The present invention solves current cement base mending mortar and the problem of linking new and old concrete effect is poor, and new-old concrete interface binding intensity is insufficient, is easy cracking easily occurs.
Description
Technical field
The invention belongs to concrete fields, and in particular to a kind of cement base mending mortar and preparation method thereof.
Background technology
Mending mortar is a kind of cement special based polyalcohol mortar for concrete structural surface defect and strengthening construction,
With higher compression strength, caking property, crack resistance and water proofing property.It can be in industry and the civilian concrete structure table to have cracked
Face is repaired, or is repaired in the industrial civil building that has damaged and cannot meet design requirement.
Caused structural failure or building function failure is not only affecting people just due to various reasons for the world today
It often lives and causes huge economic loss, 40% or more of industrially developed country's total investment for construction is all used for repairing for building
It mends and reinforces, the construction of new building is just used for less than 60%.Have in the U.S. 40% bridge it is badly damaged, and it is left in China 30%
Right breakage on cement concrete pavement, it is clear that facility will have been damaged and replaced or build again completely, this is economically not
Feasible, solution is only repaired.
Cement base is carried out generally directed to specific works category to the preparation of cement base structure repair mortar both at home and abroad at present
Structure repair mortar development carries out certain development for having the characteristics that specific use or having a certain reinforcement material, such as high
By force, large fluidity etc. carries out road surface reparation using the normal concrete of a little higher than former strength grade of concrete, but new and old coagulation
Native bond effect is poor, and new-old concrete interface binding intensity is insufficient, cracking is easy, to limit cement base structure repair mortar
Production and application.Therefore, producing a kind of mending mortar that can be solved the above problems has the prodigious market demand.
Invention content
The technical problems to be solved by the invention：Easily there is linking new and old concrete effect for current cement base mending mortar
Fruit is poor, and new-old concrete interface binding intensity is insufficient, and the problem of being easy to crack, the present invention provides a kind of cement base mending mortars
And preparation method thereof.
In order to solve the above technical problems, the present invention is using technical solution as described below：
A kind of cement base mending mortar includes the component of following parts by weight, 100 ~ 150 parts of cement, 40 ~ 55 parts of water, 3 ~ 5 parts of morning
0.5 ~ 0.9 part of water-reducing agent of strong agent, which is characterized in that further include 70 ~ 80 parts of aggregates, 16 ~ 19 parts of additives, 7 ~ 9 parts of composite polymerics
Object；
The aggregate processing method is：
（1）In mass ratio 4 ~ 7:3~5:2, it takes gangue, quartz sand and sepiolite to be put into ball mill and carries out ball milling, collect ball milling
Ball milling object is put into calcining furnace and calcines by object, collects calcined material, mills, and is sieved, and collects sieving particle；
（2）In mass ratio 5 ~ 7:1:13 are uniformly mixed sieving particle, hydrochloric acid solution and surfactant, are positioned in micro-wave oven
Heating, cooling, spray drying collect dried object to get aggregate；
The preparation method of the additive is：In mass ratio 4:2:1~3:13, by humic acid, sodium humate, acrylamide-allyl
Base sodium sulfonate copolymers and water are uniformly mixed, and 40 ~ 50min is heated at 65 ~ 70 DEG C, add sodium humate quality 1 ~ 3%
Potassium stearate stirs, and stands, freeze-drying, collects freeze-drying object to get additive；
The composition polymer is poly-aspartate, polyvinyl alcohol in mass ratio 1:3 mix.
The cement is any one in sulphate aluminium cement, magnesium phosphate cement.
The water-reducing agent is polycarboxylate water-reducer.
The early strength agent is by calcium nitrate, cobalt carbonate in mass ratio 9:1 mixes.
The surfactant is any one in neopelex, lauryl sodium sulfate.
The preparation method of the cement base mending mortar includes the following steps：
A. it counts in parts by weight, takes raw material；
B. water intaking gross mass 50 ~ 60% water be stirred with composition polymer, additive, standing, add remaining water,
Cement, early strength agent, water-reducing agent, aggregate are uniformly mixed to get cement base mending mortar.
Compared with other methods, advantageous effects are the present invention：
The present invention prepares aggregate using gangue, quartz sand and sepiolite as raw material, is being absorbed water by the sepiolite in aggregate
Flexible fibre shape is formed later, there is very strong penetration, can effectively destroy old concrete surface, while utilizing hydrochloric acid
It cleans to gangue, increases the porosity inside gangue, improve the load capacity to sepiolite, utilize composition polymer
Water absorbing capacity, when realizing storage to water, while being combined again with aggregate, increase sepiolite time of penetration, and in coal
The hydration capability for promoting new-old concrete under the action of spoil, is improved the conjugation of new-old concrete, is finished using aggregate increase
Intensity is closed, the calcium ion released in hydration process makes it be carried out with aggregate by the effect of humic acid and sodium humate
Progress combines, and new-old concrete interface binding intensity is increased, and in early strength agent under the action of cobalt carbonate, in aggregate
Particle promotes the aquation of cement as nucleus, improves the performance of mending mortar.
Specific implementation mode
Aggregate processing：
（1）In mass ratio 4 ~ 7:3~5:2, it takes gangue, quartz sand and sepiolite to be put into ball mill and ball is carried out with 800r/min
40min is ground, ball milling object is collected, ball milling object is put into calcining furnace and is calcined at 1000 DEG C, calcined material is collected, mills, mistake
300 mesh sieve, and collect sieving particle；
（2）In mass ratio 5 ~ 7:1:13 are uniformly mixed sieving particle, hydrochloric acid solution and surfactant, are positioned in micro-wave oven
70min is heated, cooling, spray drying collects dried object to get aggregate.
Acrylamide Sodium-Allylsulfonate-Copolymer is prepared as：In mass ratio 6:4~6:20 by acrylamide, allyl
Sodium sulfonate and water are put into reactor, and using nitrogen protection, set temperature is 30 ~ 35 DEG C, then acrylamide quality 4 ~ 6% is added dropwise
1.1mol/L ammonium persulfate solutions, after being added dropwise to complete, be stirred to react 3h, alcohol precipitation, filtering collects filter residue to get acrylamide-
Sodium Allyl Sulfonate copolymer.
The preparation method of additive is：In mass ratio 4:2:1~3:13, by humic acid, sodium humate, acrylamide-allyl
Base sodium sulfonate copolymers and water are uniformly mixed, and 40 ~ 50min is heated at 65 ~ 70 DEG C, add sodium humate quality 1 ~ 3%
Potassium stearate, stirring stand 2h, and freeze-drying collects freeze-drying object to get additive.
Composition polymer is formulated as poly-aspartate, polyvinyl alcohol in mass ratio 1:3 mix.
Any one being selected as in sulphate aluminium cement, magnesium phosphate cement of cement.
Water-reducing agent is selected as polycarboxylate water-reducer.
Early strength agent is formulated as calcium nitrate, cobalt carbonate in mass ratio 9:1 mixes.
Any one being selected as in neopelex, lauryl sodium sulfate of surfactant.
A kind of cement base mending mortar includes the component of following parts by weight, 100 ~ 150 parts of cement, 40 ~ 55 parts of water, 3 ~ 5
Part 0.5 ~ 0.9 part of water-reducing agent of early strength agent, further includes 70 ~ 80 parts of aggregates, 16 ~ 19 parts of additives, 7 ~ 9 parts of composition polymers；
A kind of preparation method of cement base mending mortar, which is characterized in that the preparation method includes the following steps：
A. it counts in parts by weight, takes raw material；
B. 50 ~ 60% water of water intaking gross mass is stirred with composition polymer, additive, and 30min is stood at 40 DEG C, then
Remaining water, cement, early strength agent, water-reducing agent, aggregate is added, is uniformly mixed to get cement base mending mortar.
Aggregate processing：
（1）In mass ratio 4:3:2, it takes gangue, quartz sand and sepiolite to be put into ball mill and ball milling is carried out with 800r/min
40min collects ball milling object, ball milling object is put into calcining furnace and is calcined at 1000 DEG C, collects calcined material, mills, and crosses 300
Mesh sieves, and collects sieving particle；
（2）In mass ratio 5:1:13 are uniformly mixed sieving particle, hydrochloric acid solution and surfactant, are positioned in micro-wave oven and add
Hot 70min, cooling, spray drying collect dried object to get aggregate.
Acrylamide Sodium-Allylsulfonate-Copolymer is prepared as：In mass ratio 6:4:20 by acrylamide, allyl sulphur
Sour sodium and water are put into reactor, and using nitrogen protection, set temperature is 30 DEG C, then acrylamide quality 4% is added dropwise
1.1mol/L ammonium persulfate solutions after being added dropwise to complete, are stirred to react 3h, alcohol precipitation, and filtering collects filter residue to get acryloyl amine-ene
Propyl sulfonic acid sodium copolymer.
The preparation method of additive is：In mass ratio 4:2:1~3:13, by humic acid, sodium humate, acrylamide-allyl
Base sodium sulfonate copolymers and water are uniformly mixed, and 40min is heated at 65 DEG C, add the potassium stearate of sodium humate quality 1%,
Stirring, stands 2h, and freeze-drying collects freeze-drying object to get additive.
Composition polymer is formulated as poly-aspartate, polyvinyl alcohol in mass ratio 1:3 mix.
Cement is selected as sulphate aluminium cement.
Water-reducing agent is selected as polycarboxylate water-reducer.
Early strength agent is formulated as calcium nitrate, cobalt carbonate in mass ratio 9:1 mixes.
Surfactant is selected as neopelex.
A kind of cement base mending mortar includes the component of following parts by weight, 100 parts of cement, 40 parts of water, 3 parts of early strength agent
0.5 part of water-reducing agent further includes 70 parts of aggregates, 16 parts of additives, 7 parts of composition polymers；
A kind of preparation method of cement base mending mortar, which is characterized in that the preparation method includes the following steps：
A. it counts in parts by weight, takes raw material；
B. 50% water of water intaking gross mass is stirred with composition polymer, additive, 30min is stood at 40 DEG C, then add
Enter remaining water, cement, early strength agent, water-reducing agent, aggregate, is uniformly mixed to get cement base mending mortar.
Aggregate processing：
（1）In mass ratio 7:5:2, it takes gangue, quartz sand and sepiolite to be put into ball mill and ball milling is carried out with 800r/min
40min collects ball milling object, ball milling object is put into calcining furnace and is calcined at 1000 DEG C, collects calcined material, mills, and crosses 300
Mesh sieves, and collects sieving particle；
（2）In mass ratio 7:1:13 are uniformly mixed sieving particle, hydrochloric acid solution and surfactant, are positioned in micro-wave oven and add
Hot 70min, cooling, spray drying collect dried object to get aggregate.
Acrylamide Sodium-Allylsulfonate-Copolymer is prepared as：In mass ratio 6:6:20 by acrylamide, allyl sulphur
Sour sodium and water are put into reactor, and using nitrogen protection, set temperature is 35 DEG C, then acrylamide quality 6% is added dropwise
1.1mol/L ammonium persulfate solutions after being added dropwise to complete, are stirred to react 3h, alcohol precipitation, and filtering collects filter residue to get acryloyl amine-ene
Propyl sulfonic acid sodium copolymer.
The preparation method of additive is：In mass ratio 4:2:3:13, by humic acid, sodium humate, acrylamide-allyl
Sodium sulfonate copolymers and water are uniformly mixed, and 50min is heated at 70 DEG C, are added the potassium stearate of sodium humate quality 3%, are stirred
It mixes, stands 2h, freeze-drying collects freeze-drying object to get additive.
Composition polymer is formulated as poly-aspartate, polyvinyl alcohol in mass ratio 1:3 mix.
Cement is selected as magnesium phosphate cement.
Water-reducing agent is selected as polycarboxylate water-reducer.
Early strength agent is formulated as calcium nitrate, cobalt carbonate in mass ratio 9:1 mixes.
Surfactant is selected as lauryl sodium sulfate.
A kind of cement base mending mortar includes the component of following parts by weight, 150 parts of cement, 55 parts of water, 5 parts of early strength agent
0.9 part of water-reducing agent further includes 80 parts of aggregates, 19 parts of additives, 9 parts of composition polymers；
A kind of preparation method of cement base mending mortar, which is characterized in that the preparation method includes the following steps：
A. it counts in parts by weight, takes raw material；
B. 60% water of water intaking gross mass is stirred with composition polymer, additive, 30min is stood at 40 DEG C, then add
Enter remaining water, cement, early strength agent, water-reducing agent, aggregate, is uniformly mixed to get cement base mending mortar.
Aggregate processing：
（1）In mass ratio 5:4:2, it takes gangue, quartz sand and sepiolite to be put into ball mill and ball milling is carried out with 800r/min
40min collects ball milling object, ball milling object is put into calcining furnace and is calcined at 1000 DEG C, collects calcined material, mills, and crosses 300
Mesh sieves, and collects sieving particle；
（2）In mass ratio 6:1:13 are uniformly mixed sieving particle, hydrochloric acid solution and surfactant, are positioned in micro-wave oven and add
Hot 70min, cooling, spray drying collect dried object to get aggregate.
Acrylamide Sodium-Allylsulfonate-Copolymer is prepared as：In mass ratio 6:5:20 by acrylamide, allyl sulphur
Sour sodium and water are put into reactor, and using nitrogen protection, set temperature is 33 DEG C, then acrylamide quality 5% is added dropwise
1.1mol/L ammonium persulfate solutions after being added dropwise to complete, are stirred to react 3h, alcohol precipitation, and filtering collects filter residue to get acryloyl amine-ene
Propyl sulfonic acid sodium copolymer.
The preparation method of additive is：In mass ratio 4:2:2:13, by humic acid, sodium humate, acrylamide-allyl
Sodium sulfonate copolymers and water are uniformly mixed, and 45min is heated at 67 DEG C, are added the potassium stearate of sodium humate quality 2%, are stirred
It mixes, stands 2h, freeze-drying collects freeze-drying object to get additive.
Composition polymer is formulated as poly-aspartate, polyvinyl alcohol in mass ratio 1:3 mix.
Cement is selected as sulphate aluminium cement.
Water-reducing agent is selected as polycarboxylate water-reducer.
Early strength agent is formulated as calcium nitrate, cobalt carbonate in mass ratio 9:1 mixes.
Surfactant is selected as lauryl sodium sulfate.
A kind of cement base mending mortar includes the component of following parts by weight, 125 parts of cement, 47 parts of water, 4 parts of early strength agent
0.7 part of water-reducing agent further includes 75 parts of aggregates, 18 parts of additives, 8 parts of composition polymers；
A kind of preparation method of cement base mending mortar, which is characterized in that the preparation method includes the following steps：
A. it counts in parts by weight, takes raw material；
B. 55% water of water intaking gross mass is stirred with composition polymer, additive, 30min is stood at 40 DEG C, then add
Enter remaining water, cement, early strength agent, water-reducing agent, aggregate, is uniformly mixed to get cement base mending mortar.
Comparative example 1：It is essentially identical with the preparation method of embodiment 2, it has only the difference is that lacking aggregate.
Comparative example 2：It is essentially identical with the preparation method of embodiment 2, it has only the difference is that lacking additive.
Comparative example 3：It is essentially identical with the preparation method of embodiment 2, it has only the difference is that lacking composition polymer.
Comparative example 4：Nanjing is the mending mortar of certain company production.
Mortar made from embodiment and comparative example is subjected to performance detection respectively, performance test methods are with reference to JC/T984-
2011.Environment temperature control is 60 ± 5% in 20 DEG C ± 3 DEG C, relative humidity when experiment, first pours into mold mending mortar and inserts
It is pounded type, test specimen is respectively placed in mould in the environment of wind lamp photograph by smooth out surface, and tracking observation is carried out to cracking situation.
Under conditions of wind lamp shines, test specimen is observed for 24 hours.After the test, the item number in each crack of essential record.Test result
It is shown in Table 1.
Table 1：
| Test event | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Adhesion strength（MPa） | 1.34 | 1.35 | 1.33 | 0.72 | 1.1 | 1.28 | 0.61~0.68 |
| Compression strength（MPa） | 65 | 66 | 65 | 65 | 62 | 60 | 40~43 |
| Number of Fractures | 1 | 0 | 0 | 1 | 1 | 3 | 4~5 |
| Workability（Degree of sinking to, cm） | 7.2 | 7 | 6.8 | 7 | 4.8 | 6.7 | 3.8~4.4 |
| Freexing tolerance | Without cracking, peel off | Without cracking, peel off | Without cracking, peel off | Without cracking, peel off | Without cracking, peel off | Slight cracking peels off | Slight cracking peels off |
In summary, mending mortar properties of the invention are superior to commercial product, are worth of widely use.
Claims (6)
1. a kind of cement base mending mortar, include the component of following parts by weight, 100~150 parts of cement, 40~55 parts of water, 3~
5 parts of early strength agent, 0.5~0.9 part of water-reducing agent, which is characterized in that further include 70~80 parts of aggregates, 16~19 parts of additives, 7~9 parts
Composition polymer；
The aggregate processing method is：
（1）In mass ratio 4~7:3~5:2, it takes gangue, quartz sand and sepiolite to be put into ball mill and carries out ball milling, collect ball
Object is ground, ball milling object is put into calcining furnace and is calcined, calcined material is collected, mills, is sieved, sieving particle is collected；
（2）In mass ratio 5~7:1:13 are uniformly mixed sieving particle, hydrochloric acid solution and surfactant, are positioned over micro-wave oven
Middle heating, cooling, spray drying collect dried object to get aggregate；
The preparation method of the additive is：In mass ratio 4:2:1~3:13, by humic acid, sodium humate, acryloyl amine-ene
Propyl sulfonic acid sodium copolymer and water are uniformly mixed, and 40~50min is heated at 65~70 DEG C, add sodium humate quality 1~
3% potassium stearate stirs, and stands, freeze-drying, collects freeze-drying object to get additive；
The composition polymer is poly-aspartate, polyvinyl alcohol in mass ratio 1:3 mix.
2. cement base mending mortar according to claim 1, which is characterized in that the cement is sulphate aluminium cement, phosphoric acid
Any one in magnesium cement.
3. cement base mending mortar according to claim 1, which is characterized in that the water-reducing agent is polycarboxylate water-reducer.
4. cement base mending mortar according to claim 1, which is characterized in that the early strength agent is by calcium nitrate, cobalt carbonate
In mass ratio 9:1 mixes.
5. cement base mending mortar according to claim 1, which is characterized in that the surfactant is detergent alkylate sulphur
Any one in sour sodium, lauryl sodium sulfate.
6. a kind of preparation method of the cement base mending mortar as described in claim 1 to 5 any one, which is characterized in that the system
Preparation Method includes the following steps：
A. it counts in parts by weight, takes raw material；
B. 50~60% water of water intaking gross mass is stirred with composition polymer, additive, is stood, is added remaining
Water, cement, early strength agent, water-reducing agent, aggregate are uniformly mixed to get cement base mending mortar.
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| CN110104975A (en) * | 2019-05-15 | 2019-08-09 | 中南大学 | A kind of technique that belt type roasting machine pelletizing method prepares gangue lightweight aggregate |
| CN115991591A (en) * | 2022-12-16 | 2023-04-21 | 太原理工大学 | Ecological high-ductility cement-based rapid repair material prepared from gangue solid waste and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110104975A (en) * | 2019-05-15 | 2019-08-09 | 中南大学 | A kind of technique that belt type roasting machine pelletizing method prepares gangue lightweight aggregate |
| CN110104975B (en) * | 2019-05-15 | 2021-06-08 | 中南大学 | Process for preparing coal gangue lightweight aggregate by belt type roasting machine pelletizing method |
| CN115991591A (en) * | 2022-12-16 | 2023-04-21 | 太原理工大学 | Ecological high-ductility cement-based rapid repair material prepared from gangue solid waste and method |
| CN115991591B (en) * | 2022-12-16 | 2024-02-02 | 太原理工大学 | Ecological high-ductility cement-based rapid repair material prepared from gangue solid waste and method |
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