CN110282951A - A kind of magnesium phosphate cement base fast repairing material and its preparation method and application - Google Patents
A kind of magnesium phosphate cement base fast repairing material and its preparation method and application Download PDFInfo
- Publication number
- CN110282951A CN110282951A CN201910628482.8A CN201910628482A CN110282951A CN 110282951 A CN110282951 A CN 110282951A CN 201910628482 A CN201910628482 A CN 201910628482A CN 110282951 A CN110282951 A CN 110282951A
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- CN
- China
- Prior art keywords
- magnesium phosphate
- cement base
- phosphate cement
- fast repairing
- repairing material
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B28/342—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 the phosphate binder being present in the starting composition as a mixture of free acid and one or more reactive oxides
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- 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 present invention provides a kind of magnesium phosphate cement base fast repairing materials and its preparation method and application, belong to the field of building materials.Magnesium phosphate cement base fast repairing material provided by the invention, by being prepared comprising solid component and water, the mass ratio of the solid component and water is 1:(0.18~0.30)；The solid component includes the substance of following mass percentage: magnesia powder 23%~35%, potassium dihydrogen phosphate 13%~22%, flyash 0~9%, quartz sand 28%~32%, borax 1%, silicon ash 2%, agstone 0~11%, in the solid component mass percentage of each substance and be 100%.Magnesium phosphate cement base fast repairing material provided by the invention can be under the conditions of compared with low temperature, the effective interfacial bond property for improving new-old concrete.
Description
Technical field
The invention belongs to the field of building materials, and in particular to a kind of magnesium phosphate cement base fast repairing material and its preparation side
Method and application.
Background technique
The rapid condensation hardening of concrete plays an important role for the control of guarantee duration and construction quality, wherein
Iron pipe fitting is the method for guaranteeing that one kind of construction quality and duration are important.But when carrying out underground construction, it is contemplated that temperature
Duration and construction environment problem are influenced, subway tubulation part will appear various problems in transport and hoisting process and lead to the duration
Delay situations such as, and subway tubulation part also will receive different degrees of damage, and such as repairing will seriously affect engineering not in time
Service life and traffic safety.Therefore often take over the ground iron pipe fitting in such a way that patching material is directly repaired,
Ensure going on smoothly for engineering.
Currently, the common direct method for repairing and mending of defect has: to compared with small crack, should in time remove the dust in crack dry
Only, then tar sand or pitch horseshoe rouge joint seal are filled, then uses epoxy gluing；To serious crack, preferably first by loose part
After removing and removing completely, under drying regime, with liquid asphalt brushing slotted wall, it is further filled with tar sand tamping, plates, and be subject to
Fine sand covering.
But existing patching material is in use, and interface binding intensity will receive the influence of varying environment and condition,
Lead to the difference for having very big in the adhesion strength of new-old concrete, seriously affects the smooth and smooth degree in repairing face and wet
Profit and degree of drying.
Summary of the invention
In consideration of it, the purpose of the present invention is to provide a kind of magnesium phosphate cement base fast repairing material and preparation method thereof and
Using.Magnesium phosphate cement base fast repairing material provided by the invention has the property of high interface binding intensity under cryogenic
Energy.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of magnesium phosphate cement base fast repairing materials, by being prepared comprising solid component and water,
The mass ratio of the solid component and water is 1:(0.18~0.30)；The solid component includes the object of following mass percentage
Matter:
Magnesia powder 23%~35%, potassium dihydrogen phosphate 13%~22%, flyash 0~9%, quartz sand 28%~
32%, borax 1%, silicon ash 2%, agstone 0~11% mass percentage of each substance and are in the solid component
100%.
Preferably, the magnesia powder is magnesite reheating powder, and the temperature of the reheating is 1700~2000 DEG C.
Preferably, the partial size of the magnesia powder is 60~85 μm.
Preferably, the flyash is level-one flyash and/or second class powered coal ash.
Preferably, the partial size of the agstone is 5~6.5 μm.
The present invention also provides the preparation methods of magnesium phosphate cement base fast repairing material described in above-mentioned technical proposal, include
Following steps:
After magnesia, potassium dihydrogen phosphate, borax, quartz sand, flyash, silicon ash, agstone and water are mixed, in progress
And reaction, obtain magnesium phosphate cement base fast repairing material.
The present invention also provides described in above-mentioned technical proposal magnesium phosphate cement base fast repairing material or above-mentioned technical side
Magnesium phosphate cement base fast repairing material made from preparation method described in case carries out in Rapid-Repair to subway prefabricated pipe section
Application.
Preferably, the Applicable temperature of the magnesium phosphate cement base fast repairing material is -15 DEG C~10 DEG C.
Preferably, the solid component in the magnesium phosphate cement base fast repairing material, which carries out repairing, after mixing with water makes
With.
The present invention provides a kind of magnesium phosphate cement base fast repairing materials, by being prepared comprising solid component and water,
The mass ratio of the solid component and water is 1:(0.18~0.30)；The solid component includes the object of following mass percentage
Matter: magnesia powder 23%~35%, potassium dihydrogen phosphate 13%~22%, flyash 0~9%, quartz sand 28%~32%, borax
1%, silicon ash 2%, agstone 0~11%, the mass percentage of each substance and be 100% in the solid component.This hair
Bright magnesia and potassium dihydrogen phosphate by adding specific dosage, and it is fast come the magnesium phosphate cement base prepared with specific water-cement ratio
Fast patching material has the performance of high interface binding intensity under cryogenic.Magnesium phosphate cement base provided by the invention is quickly repaired
When mending material and cement generation hydration reaction, acid-base neutralization reaction occurs for magnesia and potassium dihydrogen phosphate in patching material, produces
Six water potassium magnesium phosphate of object has high bond strength, can effectively improve the interfacial bond property of new-old concrete, and with acid
The generation of alkali neutralization reaction can release a large amount of heat, can obviously improve fast repairing material under cryogenic to subway prefabricated pipe
The repair efficiency of piece accelerates the repairing speed of subway prefabricated pipe section.Embodiment the result shows that, magnesium phosphate cement provided by the invention
It is strong that base fast repairing material shows excellent high interfacial adhesion to the concrete material of varying strength under condition of different temperatures
Performance is spent, the compression strength of fast repairing material can reach 30MPa or more in 3h.
And magnesium phosphate cement base fast repairing material provided by the invention can Rapid-Repair subway prefabricated pipe section transport or
The defect problem occurred in hoisting process effectively improves the practical performance and external appearance of subway tubulation part, in low temperature item
Without heating fast repairing material when being used under part, directly by fast repairing material solid component and water directly mix and be
Can, significantly reduce the restriction that environment temperature constructs for patching material.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is magnesium phosphate cement base fast repairing material provided by the invention section adhesion strength test schematic diagram.
Specific embodiment
The present invention provides a kind of magnesium phosphate cement base fast repairing materials, by being prepared comprising solid component and water,
The mass ratio of the solid component and water is 1:(0.18~0.30), preferably 1:0.20~1:0.24.In the present invention, described
Solid component includes the substance of following mass percentage: magnesia powder 23%~35%, potassium dihydrogen phosphate 13%~22%, powder
Coal ash 0~9%, quartz sand 28%~32%, borax 1%, silicon ash 2%, agstone 0~11%, it is each in the solid component
The mass percentage of substance and be 100%, preferably magnesia powder 30%~35%, potassium dihydrogen phosphate 15%~20%, powder
Coal ash 3%~8%, quartz sand 28%~30%, borax 1%, silicon ash 2%, agstone 3%~7%.
In the present invention, the magnesia powder is preferably magnesite reheating powder, the main component of the magnesite reheating powder
For MgO, content > 96wt% of the MgO；The temperature of the reheating is preferably 1700~2000 DEG C, further preferably 1800
~1900 DEG C；The partial size of the magnesia powder is preferably 60~85 μm, and further preferably 65~75 μm.Present invention preferably employs
Magnesite reheating powder, can reduce the activity of magnesia powder, efficiently control the stability of magnesia powder and biphosphate nak response,
And then shorten magnesium phosphate cement base fast repairing material setting time, and ensure that fast repairing material mobility and can
Formability.
In the present invention, the flyash is preferably level-one flyash and/or second class powered coal ash, the partial size of the flyash
Preferably 8~20 μm, further preferably 10~15 μm.The present invention adjusts the gradation of each component by using flyash, and increases
Add mortar compactness.And the present invention can reduce water-cement ratio by adding flyash, centainly at increase Rapid-Repair material in degree
The compression strength of material.
In the present invention, the partial size of the silicon ash is preferably 0.1~1 μm, and further preferably 0.2~0.5 μm.The present invention
Microcosmic gap is filled by adding silicon ash, increases the compression strength and water resistance of fast repairing material.
In the present invention, the partial size of the agstone is preferably 4~7 μm, and further preferably 5~6.5 μm.
In the present invention, the partial size of the quartz sand is preferably 0.075~0.6mm, further preferably 0.075~
0.4mm, the quartz sand are that main component is SiO2, the SiO2Content preferably >=98wt%.The present invention passes through addition quartz
Sand and agstone adjust the appearance color of patching material, and reduce cost.
In the present invention, the borax is preferably standard borax, and the partial size of the borax is preferably 280~330 μm, into one
Preferably 280~300 μm of step.The present invention adds borax and plays deferred action, is conducive to construction.
The present invention does not have special restriction to the specific source of each substance in the solid component, using this field routine city
Sell product.
The present invention also provides the preparation methods of magnesium phosphate cement base fast repairing material described in above-mentioned technical proposal, include
Following steps:
After magnesia, potassium dihydrogen phosphate, borax, quartz sand, flyash, silicon ash, agstone and water are mixed, in progress
And reaction, obtain magnesium phosphate cement base fast repairing material.
In the present invention, the mixing carries out preferably in transit mixer.The present invention is to the mixed concrete operations
There is no special restriction, using those skilled in the art's routine hybrid mode.The present invention is preferably first by magnesia, di(2-ethylhexyl)phosphate
It is mixed again with water after hydrogen potassium, borax, quartz sand, flyash, silicon ash and agstone mixing.
The present invention also provides described in above-mentioned technical proposal magnesium phosphate cement base fast repairing material or above-mentioned technical side
Magnesium phosphate cement base fast repairing material made from preparation method described in case carries out in Rapid-Repair to subway prefabricated pipe section
Application.
In the present invention, the Applicable temperature of the magnesium phosphate cement base fast repairing material is preferably -15 DEG C~10 DEG C.
The present invention repairs after preferably mixing the solid component in the magnesium phosphate cement base fast repairing material with water
It mends and uses.In the present invention, when the magnesium phosphate cement base fast repairing material in 0 DEG C and following environment in use, this hair
It is bright that the solid component in the magnesium phosphate cement base fast repairing material is directly preferably stirred into progress with 80 DEG C or more of hot water
Repairing uses, alternatively, it is preferred that at normal temperature, by the solid component and normal-temperature water in the magnesium phosphate cement base fast repairing material
Directly stirring carries out repairing use, after conserving 0.5~1.5h, moves to and conserves molding at -15~10 DEG C；The magnesium phosphate cement base
Fast repairing material is in 0 DEG C of environment above in use, the present invention preferably will be in the magnesium phosphate cement base fast repairing material
Solid component and normal-temperature water directly stir and carry out repairing use.The present invention does not have special limit to the concrete operations of the maintenance
It is fixed, it is operated using those skilled in the art's conventional maintenance.
It to magnesium phosphate cement base fast repairing material provided by the invention and preparation method thereof and is answered below with reference to embodiment
With being described in detail, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
The solid component of magnesium phosphate cement base fast repairing material is prepared according to following mass percentage:
Magnesia powder 25%, potassium dihydrogen phosphate 22%, flyash 9%, quartz sand 32%, borax 1%, silicon ash 2% and stone
Limestone flour 9%；Wherein, the partial size of magnesia powder is 60~85 μm, and reheating temperature is 1800 DEG C, and the partial size of flyash is 8~20 μ
M, the partial size of quartz sand are 0.075~0.6mm, and the partial size of borax is 280~330 μm, and the partial size of silicon ash is 0.1~1 μm, lime
The partial size of mountain flour is 4~7 μm.
By obtained solid component according to water-cement ratio be 0.18:1 ratio prepare mortar, be prepared into 40mm × 40mm ×
Three gang mould of mortar of 160mm, and conserved according to GB/T17671-1999 and carry out the curved test of agent on crack resistance of concrete afterwards for 24 hours.At -15 DEG C
Under the conditions of, blanks and moulding and conserving is carried out after obtained solid component is directly stirred with 80 DEG C of hot water, in 5 DEG C and 10 DEG C of item
Under part, repairing use is carried out after obtained solid component is directly sufficiently stirred with normal-temperature water.
The interfacial bond property of magnesium phosphate cement base fast repairing material of the invention is by comparing new-old concrete material
The bending strength at interface and the degree of closeness of the bending strength of original concrete are evaluated, with specific reference to concrete anti-bending test
Method characterizes the adhesion strength situation of magnesium phosphate cement base fast repairing material and old concrete interface, specific test knot indirectly
Fruit is referring to table 1.
Fig. 1 is magnesium phosphate cement base fast repairing material provided by the invention section adhesion strength test schematic diagram.It rests
Protect to the concrete sample cutting machine of age from intermediate sawed-off, will wherein half concrete fin be put into 40mm × 40mm ×
In 160mm mould, the other half casting MPC mortar (sawed-off face is in conjunction with MPC mortar) smoothes out, demoulding after 1h, after repairing after vibrating
Test specimen is set and is conserved under room temperature.It conserves to the flexural strength of age measurement test specimen, if destroying position is in bonding interface, interface is viscous
Knotting strength is equal to actual measurement flexural strength, and otherwise, interface binding intensity is greater than actual measurement flexural strength value, wherein the age conserved is
24h。
Embodiment 2
The solid component of magnesium phosphate cement base fast repairing material is prepared according to following mass percentage:
Magnesia powder 23%, potassium dihydrogen phosphate 22%, flyash 9%, quartz sand 32%, borax 1%, silicon ash 2% and stone
Limestone flour 11%；Wherein, the partial size of magnesia powder is 65~75 μm, and reheating temperature is 1900 DEG C, the partial size of flyash is 10~
15 μm, the partial size of quartz sand is 0.075~0.4mm, and the partial size of borax is 280~300 μm, and the partial size of silicon ash is 0.2~0.5 μ
M, the partial size of agstone are 5~6.5 μm.
By obtained solid component according to water-cement ratio be 0.24:1 ratio prepare mortar, be prepared into 40mm × 40mm ×
Three gang mould of mortar of 160mm, and conserved according to GB/T17671-1999 and carry out the curved test of agent on crack resistance of concrete afterwards for 24 hours.At -15 DEG C
Under the conditions of, blanks and moulding and conserving is carried out after obtained solid component is directly stirred with 80 DEG C of hot water, in 5 DEG C and 10 DEG C of item
Under part, repairing use is carried out after obtained solid component is directly sufficiently stirred with normal-temperature water.
With reference to concrete bending resistance test method, magnesium phosphate cement base fast repairing material and old concrete interface are characterized indirectly
Adhesion strength situation, specific test result is referring to table 1.
Concrete bending resistance test method is same as Example 1.
Embodiment 3
The solid component of magnesium phosphate cement base fast repairing material is prepared according to following mass percentage:
Magnesia powder 35%, potassium dihydrogen phosphate 18%, flyash 8%, quartz sand 28%, borax 1%, silicon ash 2% and stone
Limestone flour 8%；Wherein, the partial size of magnesia powder is 60~85 μm, and reheating temperature is 1700 DEG C, and the partial size of flyash is 10~15
μm, the partial size of quartz sand is 0.075~0.4mm, and the partial size of borax is 280~330 μm, and the partial size of silicon ash is 0.2~0.5 μm,
The partial size of agstone is 5~6.5 μm.
By obtained solid component according to water-cement ratio be 0.20:1 ratio prepare mortar, be prepared into 40mm × 40mm ×
Three gang mould of mortar of 160mm, and conserved according to GB/T17671-1999 and carry out the curved test of agent on crack resistance of concrete afterwards for 24 hours.At -15 DEG C
Under the conditions of, blanks and moulding and conserving is carried out after obtained solid component is directly stirred with 80 DEG C of hot water, in 5 DEG C and 10 DEG C of item
Under part, repairing use is carried out after obtained solid component is directly sufficiently stirred with normal-temperature water.
With reference to concrete bending resistance test method, magnesium phosphate cement base fast repairing material and old concrete interface are characterized indirectly
Adhesion strength situation, specific test result is referring to table 1.
Concrete bending resistance test method is same as Example 1.
Magnesium phosphate cement base fast repairing material made from the present embodiment has been practically applied for Rapid-Repair subway prefabricated pipe
Piece, the performance test results and appearance property of the subway prefabricated pipe section after repairing meet actual demand, and the subway after repairing is prefabricated
The 3h compression strength of section of jurisdiction is 35MPa, and appearance color and old concrete color are almost the same.
Comparative example
In view of magnesium phosphate cement base fast repairing material provided by the invention is repaired with substituting existing patching material
The defect of subway prefabricated pipe section is illustrated as a comparison case with existing patching material.
Existing patching material is that this field conventional commercial patching material-water does not leak leak stopping mind, under the conditions of -15 DEG C, will be showed
Have patching material and sodium nitrite with mass ratio for the ratio mixing of 1:0.03 after, be mixed with 100 DEG C of hot water carry out at
Existing repairing material and 20 DEG C of water are mixed under conditions of 5 DEG C and 10 DEG C for type maintenance, and covering film carries out molding and supports
Shield.
Concrete anti-bending test is carried out to current material and characterizes existing repairing indirectly with reference to concrete bending resistance test method
The adhesion strength situation of material and old concrete interface, specific test result is referring to table 1.
Concrete anti-bending test is same as Example 1.
Magnesium phosphate cement base fast repairing material made from 1 Examples 1 to 3 of table and comparative example are repaired not at different temperatures
With the anti-bending test result after the concrete of intensity
As can be seen that magnesium phosphate cement base fast repairing material provided by the invention has well from above-mentioned experimental data
Interface binding intensity, can effectively bond old concrete under cryogenic, have better reality relative to existing patching material
Use performance.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of magnesium phosphate cement base fast repairing material, which is characterized in that described by being prepared comprising solid component and water
The mass ratio of solid component and water is 1:(0.18~0.30)；The solid component includes the substance of following mass percentage:
Magnesia powder 23%~35%, potassium dihydrogen phosphate 13%~22%, flyash 0~9%, quartz sand 28%~32%, boron
Sand 1%, silicon ash 2%, agstone 0~11%, the mass percentage of each substance and be 100% in the solid component.
2. magnesium phosphate cement base fast repairing material according to claim 1, which is characterized in that the magnesia powder is water chestnut
Magnesium mine reheating powder, the temperature of the reheating are 1700~2000 DEG C.
3. fast repairing material according to claim 1 or 2, which is characterized in that the partial size of the magnesia powder be 60~
85μm。
4. magnesium phosphate cement base fast repairing material according to claim 1, which is characterized in that the flyash is level-one
Flyash and/or second class powered coal ash.
5. magnesium phosphate cement base fast repairing material according to claim 1, which is characterized in that the grain of the agstone
Diameter is 5~6.5 μm.
6. the preparation method of any one of Claims 1 to 5 magnesium phosphate cement base fast repairing material, which is characterized in that packet
Containing following steps:
After magnesia, potassium dihydrogen phosphate, borax, quartz sand, flyash, silicon ash, agstone and water are mixed, neutralize anti-
It answers, obtains magnesium phosphate cement base fast repairing material.
7. the described in any item magnesium phosphate cement base fast repairing materials of Claims 1 to 5 or preparation side as claimed in claim 6
Magnesium phosphate cement base fast repairing material made from method is carrying out the application in Rapid-Repair to subway prefabricated pipe section.
8. application according to claim 7, which is characterized in that the applicable for temperature of the magnesium phosphate cement base fast repairing material
Degree is -15 DEG C~10 DEG C.
9. application according to claim 7 or 8, which is characterized in that in the magnesium phosphate cement base fast repairing material
Solid component carries out repairing use after mixing with water.
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Cited By (5)
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| CN110759660A (en) * | 2019-11-16 | 2020-02-07 | 北京建工新型建材有限责任公司 | Additive for magnesium phosphate cement repair mortar and preparation method thereof |
| CN110803912A (en) * | 2019-11-28 | 2020-02-18 | 郑州大学 | Magnesium phosphate cement-based fiber composite material and preparation method thereof |
| CN112374858A (en) * | 2020-11-16 | 2021-02-19 | 上海宝冶工程技术有限公司 | Magnesium phosphate base repairing material |
| CN115140999A (en) * | 2022-07-05 | 2022-10-04 | 青岛理工大学 | Super-early-strength-toughness quick-repair material utilizing wastewater and sludge and preparation method thereof |
| CN116427954A (en) * | 2023-06-09 | 2023-07-14 | 湖南大学 | Shield rapid repair method based on prefabricated UHPC component and magnesium phosphate cement |
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| CN110759660A (en) * | 2019-11-16 | 2020-02-07 | 北京建工新型建材有限责任公司 | Additive for magnesium phosphate cement repair mortar and preparation method thereof |
| CN110803912A (en) * | 2019-11-28 | 2020-02-18 | 郑州大学 | Magnesium phosphate cement-based fiber composite material and preparation method thereof |
| CN112374858A (en) * | 2020-11-16 | 2021-02-19 | 上海宝冶工程技术有限公司 | Magnesium phosphate base repairing material |
| CN115140999A (en) * | 2022-07-05 | 2022-10-04 | 青岛理工大学 | Super-early-strength-toughness quick-repair material utilizing wastewater and sludge and preparation method thereof |
| CN116427954A (en) * | 2023-06-09 | 2023-07-14 | 湖南大学 | Shield rapid repair method based on prefabricated UHPC component and magnesium phosphate cement |
| CN116427954B (en) * | 2023-06-09 | 2023-09-08 | 湖南大学 | Shield rapid repair method based on prefabricated UHPC component and magnesium phosphate cement |
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Application publication date: 20190927 |