CN109354471A - A kind of lower shrinkage self-compaction super hardening mending mortar and its construction technology - Google Patents
A kind of lower shrinkage self-compaction super hardening mending mortar and its construction technology Download PDFInfo
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- CN109354471A CN109354471A CN201811394183.4A CN201811394183A CN109354471A CN 109354471 A CN109354471 A CN 109354471A CN 201811394183 A CN201811394183 A CN 201811394183A CN 109354471 A CN109354471 A CN 109354471A
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- mortar
- mending mortar
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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
- C04B28/02—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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
-
- 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
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00508—Cement paints
-
- 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 lower shrinkage self-compaction super hardening mending mortar and its construction technologies, cementitious material system is made of 42.5 grades of ordinary portland cements, sulphur aluminum water mud and anhydrous gypsum, it can compensate for volume contraction caused by hydrated cementitious, effectively inhibit due to shrinking generated mortar cracking；Simultaneously mixed with early strength agent and sulphur aluminum water mud in mending mortar, so that the development of mortar early strength is very fast, it is only necessary to which very short curing period can be carried out subsequent construction, shorten the duration；Meanwhile anhydrous gypsum is capable of providing the cement later strength that sulfate ion guarantees the later period；By adding suitable water-reducing agent, retarder, so that mending mortar has higher mobility after mixing and stirring in 1h, closely knit hole and levelling ground, convenient and quick construction working procedure can be simplified automatically.Mending mortar provided by the invention meets the performance indicator of JC/T 2381-2016 " mending mortar " and JG/T 336-2011 " concrete structure reparation polymer cement mortar ".
Description
Technical field
The present invention relates to field of mortar, especially a kind of lower shrinkage self-compaction super hardening mending mortar and its construction technology.
Background technique
Currently, patching material on the market is broadly divided into three kinds: one kind is inorganic patching material, including is with ordinary cement
The ordinary mortar of major gelled material and using special cement as the extraordinary mortar of major gelled material, has and material to be repaired
Preferable material compatibility, the development of the former early strength is slow, adhesion strength is low, it is easy shrink, repair efficiency it is bad, though and the latter
Early strength development is very fast, but is easy to appear the retraction of intensity later period, new-old concrete due to strength development difference and elasticity modulus
Caused by difference the problems such as adhesive failure.Another kind is polymer patching material, mainly with epoxy resin, phenolic aldehyde and is changed
Property a kind of patching material of the polymer as cementitious matter such as phenolic resin class, have that adhesion strength is high, curing time is short, durability
The advantages that good.But and higher cost bad with cement matrix compatibility, early strength development is slow, durability is poor, and part
Product, which has environment, to be polluted.Last one kind is polymer modification patching material, is carried out using polymer to cement-based material
It is modified, although the risk for improving the compatibility of patching material and cement matrix to a certain extent, reducing contraction and cracking,
The shortcomings that developing slow and higher cost there is also early strength.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of lower shrinkage self-compaction super hardening mending mortar and its construction works
Skill can be effectively suppressed due to shrinking generated mortar cracking and the development of mortar early strength comparatively fast, meet JC/T 2381-
The performance indicator of 2016 " mending mortars " and JG/T 336-2011 " concrete structure reparation polymer cement mortar ".
To achieve the goals above, the invention provides the following technical scheme:
A kind of lower shrinkage self-compaction super hardening mending mortar, the raw material including following parts by weight:
Preferably, the rubber powder is vinyl acetate-ethylene copolymerization rubber powder.
Preferably, the water-reducing agent is poly carboxylic acid series water reducer.
Preferably, the water-retaining agent is hydroxypropyl methyl cellulose ether, viscosity 400mPas.
Preferably, the retarder is one of sodium citrate, sodium polyphosphate, tartaric acid.
Preferably, the early strength agent is one of calcium formate, calcium chloride or lithium carbonate.
Preferably, the defoaming agent is organic silicon defoamer.
The present invention also provides a kind of construction technologies of lower shrinkage self-compaction super hardening mending mortar, comprising the following steps:
A) interface processing
The interface repaired will be needed to clear up, and in the basal plane brushing interfacial agents cleared up；
B) prepared by slurry
42.5 grades of ordinary portland cements, sulphur aluminum water mud, anhydrous gypsum, 0.9~2mm quartz is added into water while agitating
Sand, 0.45~0.9mm quartz sand, 0.22~0.45mm quartz sand, rubber powder, water-reducing agent, water-retaining agent, retarder, early strength agent, defoaming
Agent, the slurry being stirred until homogeneous are then allowed to stand 1min and are further continued for 1~2min of mandatory stirring；
C) matrix surface for repairing the slurry being stirred down to needs, is smoothed out with spatula, is solidified.
Preferably, the basal plane for needing to repair digs 1~5mm to its outer, exposes new base.
The present invention provides a kind of lower shrinkage self-compaction super hardening mending mortar and its construction technology, cementitious material system by
42.5 grades of ordinary portland cements, sulphur aluminum water mud and anhydrous gypsum composition, can compensate for volume contraction caused by hydrated cementitious, effectively inhibit
Due to shrinking generated mortar cracking；Simultaneously mixed with early strength agent and sulphur aluminum water mud in mending mortar, so that mortar early strength
Development is very fast, it is only necessary to which very short curing period can be carried out subsequent construction, shorten the duration；Meanwhile anhydrous gypsum can mention
Guarantee the cement later strength in later period for sulfate ion；By adding suitable water-reducing agent, retarder, so that mending mortar exists
It mixes and stirs and has higher mobility in rear 1h, closely knit hole and levelling ground, convenient and quick construction can simplify work of constructing automatically
Sequence.Mending mortar provided by the invention meets JC/T 2381-2016 " mending mortar " and JG/T 336-2011 " concrete structure
Repair use polymer cement mortar " performance indicator.
Specific embodiment
A kind of lower shrinkage self-compaction super hardening mending mortar provided by the invention, the raw material including following parts by weight:
Cementitious material system is made of 42.5 grades of ordinary portland cements, sulphur aluminum water mud and anhydrous gypsum in the present invention, can compensate for
Volume contraction caused by hydrated cementitious effectively inhibits due to shrinking generated mortar cracking；Simultaneously mixed with morning in mending mortar
Strong agent and sulphur aluminum water mud, so that the development of mortar early strength is very fast, it is only necessary to very short curing period, can be carried out subsequent construction,
Shorten the duration；Meanwhile anhydrous gypsum is capable of providing the cement later strength that sulfate ion guarantees the later period；It is appropriate by adding
Water-reducing agent, retarder so that mending mortar has a higher mobility after mixing and stirring in 1h, can automatic closely knit hole it is simultaneously levelling
Ground, convenient and quick construction simplify working procedure.Mending mortar provided by the invention meets JC/T 2381-2016 " repairing sand
Slurry " and JG/T 336-2011 " concrete structure reparation polymer cement mortar " performance indicator.
In the present invention, 42.5 grades of ordinary portland cements, sulphur aluminum water mud, cementitious material of the anhydrous gypsum as mending mortar, energy
Enough calcium ions, aluminium ion and sulfate radical are enough provided and form entringite, generates the hydrated product based on entringite, early stage is strong
Degree development is fast, later strength retraction is smaller, generated contraction is smaller.
In an embodiment of the present invention, the parts by weight of 42.5 grades of ordinary portland cements are 150~250 parts；Of the invention preferred
Embodiment in, the parts by weight of 42.5 grades of ordinary portland cements are 180~220 parts.
In an embodiment of the present invention, the parts by weight of sulphur aluminum water mud are 150~250 parts；In currently preferred implementation
In example, the parts by weight of sulphur aluminum water mud are 160~200 parts.
In an embodiment of the present invention, the parts by weight of anhydrous gypsum are 25~50 parts；In the preferred embodiment of the invention
In, the parts by weight of anhydrous gypsum are 28~35 parts.
In the present invention, 0.9~2mm quartz sand, 0.45~0.9mm quartz sand and 0.22~0.45mm quartz sand play hardening
The effect of body structural framework, the quartz sand by adding three kinds of different-grain diameters carry out grain composition to improve mortar hardening body structure
Compactness.
In an embodiment of the present invention, the parts by weight of 0.9~2mm quartz sand are 150~300 parts；Of the invention preferred
Embodiment in, the parts by weight of 0.9~2mm quartz sand are 230~260 parts.
In an embodiment of the present invention, the parts by weight of 0.45~0.9mm quartz sand are 150~300 parts；It is excellent in the present invention
In the embodiment of choosing, the parts by weight of 0.45~0.9mm quartz sand are 184~200 parts.
In an embodiment of the present invention, the parts by weight of 0.22~0.45mm quartz sand are 100~200 parts；In the present invention
In preferred embodiment, the parts by weight of 0.22~0.45mm quartz sand are 110~130 parts.
In embodiments of the present invention, rubber powder is vinyl acetate-ethylene copolymerization rubber powder；Above-mentioned rubber powder can enhance repairing sand
Cohesive force between slurry and inorganic substrate, while increasing the flexibility of mending mortar, reduce elastic mould value and enhancing crack resistance.
In an embodiment of the present invention, the parts by weight of rubber powder are 20~50 parts；In the preferred embodiment of the invention, glue
The parts by weight of powder are 22~25 parts.
In embodiments of the present invention, water-reducing agent is poly carboxylic acid series water reducer；Above-mentioned water-reducing agent can guarantee fresh mortar
Mixing water amount is reduced under the premise of workability to improve the density and final mechanical property of mortar hardening body structure, energy
Assign the high fluidity in mending mortar certain time enough to achieve the effect that self-compaction.
In an embodiment of the present invention, the parts by weight of water-reducing agent are 1~3 part；In the preferred embodiment of the invention, subtract
The parts by weight of aqua are 1~1.5 part.
In embodiments of the present invention, water-retaining agent is hydroxypropyl methyl cellulose ether, viscosity 400mPas.Above-mentioned water conservation
Agent can provide required water for the cementitious material aquation in mending mortar, and the viscosity that mortar is controlled together with rubber powder is being closed
In the range of reason, the mobility of mortar is not influenced and prevents the bleeding and isolation of mortar.
In an embodiment of the present invention, the parts by weight of water-retaining agent are 1~2 part；In the preferred embodiment of the invention, protect
The parts by weight of aqua are 1.5~2 parts.
In embodiments of the present invention, retarder is one of sodium citrate, sodium polyphosphate, tartaric acid.
In an embodiment of the present invention, the parts by weight of retarder are 0.5~2 part；In the preferred embodiment of the invention,
The parts by weight of retarder are 0.7~1 part.
In embodiments of the present invention, early strength agent is one of calcium formate, lithium carbonate and aluminum sulfate.
It should be noted that above-mentioned retarder and early strength agent cooperation can adjust condensation firm time and the morning of mending mortar
Phase strength development speeds；By adding poly carboxylic acid series water reducer, under the synergistic effect of retarder, when imparting fresh mortar is suitable
Interior higher fluidity, to achieve the effect that self-compaction and Self-leveling.
In an embodiment of the present invention, the parts by weight of early strength agent are 0.5~2 part；In the preferred embodiment of the invention,
The parts by weight of early strength agent are 0.8~1.2 part.
In embodiments of the present invention, defoaming agent is organic silicon defoamer, can eliminate the biggish bubble of partial size in mortar, have
Help closely knit hardenite structure.
In an embodiment of the present invention, the parts by weight of defoaming agent are 0.5~2 part；In the preferred embodiment of the invention,
The parts by weight of defoaming agent are 0.9~1.2 part.
In an embodiment of the present invention, the parts by weight of water are 150~200 parts；In the preferred embodiment of the invention, water
Parts by weight be 180~195 parts.
The present invention also provides a kind of above-mentioned construction technologies of lower shrinkage self-compaction super hardening mending mortar, including following step
It is rapid:
A) interface processing
The interface repaired will be needed to clear up, and in the basal plane brushing interfacial agents cleared up；
B) prepared by slurry
42.5 grades of ordinary portland cements, sulphur aluminum water mud, anhydrous gypsum, 0.9~2mm quartz is added into water while agitating
Sand, 0.45~0.9mm quartz sand, 0.22~0.45mm quartz sand, rubber powder, water-reducing agent, water-retaining agent, retarder, early strength agent, defoaming
Agent, the slurry being stirred until homogeneous are then allowed to stand 1min and are further continued for 1~2min of mandatory stirring；
C) matrix surface for repairing the slurry being stirred down to needs, is smoothed out with spatula, is solidified.
Construction technology of the present invention is simple, and the matrix of repairing meets JC/T 2381-2016 " mending mortar " and JG/T336-
The performance indicator of 2011 " concrete structure reparation polymer cement mortars ".
In order to further illustrate the present invention, super early to a kind of lower shrinkage self-compaction provided by the invention below with reference to embodiment
Strong mending mortar and its construction technology are described in detail, but they cannot be interpreted as to the limit to the scope of the present invention
It is fixed.
Poly carboxylic acid series water reducer is DH-4004 type poly carboxylic acid series water reducer in Examples 1 to 3, and organic silicon defoamer is
Methyl-silicone oil.
Embodiment 1
Lower shrinkage self-compaction super hardening mending mortar, the raw material including following parts by weight:
180 parts of 42.5 grades of ordinary portland cements, 200 parts of sulphur aluminum water mud, 35 parts of anhydrous gypsums, 260 parts of 0.9~2mm quartz sands,
184 parts of 0.45~0.9mm quartz sands, 110 parts of 0.22~0.45mm quartz sands, 25 parts of vinyl acetate-ethylene copolymerization rubber powders, 1.5
Hydroxypropyl methyl cellulose ether, 1 part of tartaric acid, the 0.8 part of formic acid that part poly carboxylic acid series water reducer, 1.5 parts of viscosity are 400mPas
Calcium, 1.2 parts of organic silicon defoamers and 180 parts of water；
The construction technology of lower shrinkage self-compaction super hardening mending mortar, comprising the following steps:
A) interface processing
The basal plane for needing to repair digs 1~5mm to its outer, exposes new base, and clear up, in the basal plane brushing cleared up
Interfacial agents；
B) prepared by slurry
42.5 grades of ordinary portland cements, sulphur aluminum water mud, anhydrous gypsum, 0.9~2mm quartz is added into water while agitating
Sand, 0.45~0.9mm quartz sand, 0.22~0.45mm quartz sand, rubber powder, water-reducing agent, water-retaining agent, retarder, early strength agent, defoaming
Agent, the slurry being stirred until homogeneous are then allowed to stand 1min and are further continued for mandatory stirring 1min；
C) matrix surface for repairing the slurry being stirred down to needs, is smoothed out with spatula, is solidified.
The lower shrinkage self-compaction super hardening mending mortar of embodiment 1 is subjected to physical and mechanical property test, the results are shown in Table 1.
The physics characteristic test result of 1 embodiment 1 of table
As it can be seen from table 1 the performance indicator of the lower shrinkage self-compaction super hardening mending mortar of embodiment 1 meets JC/T
2381-2016 " mending mortar " and JG/T 336-2011 " concrete structure reparation polymer cement mortar ".
Embodiment 2
Lower shrinkage self-compaction super hardening mending mortar, the raw material including following parts by weight:
200 parts of 42.5 grades of ordinary portland cements, 180 parts of sulphur aluminum water mud, 30 parts of anhydrous gypsums, 230 parts of 0.9~2mm quartz sands,
200 parts of 0.45~0.9mm quartz sands, 130 parts of 0.22~0.45mm quartz sands, 24 parts of vinyl acetate-ethylene copolymerization rubber powders, 1.2
Hydroxypropyl methyl cellulose ether, 0.8 part of tartaric acid, the 1 part of formic acid that part poly carboxylic acid series water reducer, 1.8 parts of viscosity are 400mPas
Calcium, 1 part of organic silicon defoamer and 190 parts of water；
The construction technology of lower shrinkage self-compaction super hardening mending mortar, comprising the following steps:
A) interface processing
The basal plane for needing to repair digs 1~5mm to its outer, exposes new base, and clear up, in the basal plane brushing cleared up
Interfacial agents；
B) prepared by slurry
42.5 grades of ordinary portland cements, sulphur aluminum water mud, anhydrous gypsum, 0.9~2mm quartz is added into water while agitating
Sand, 0.45~0.9mm quartz sand, 0.22~0.45mm quartz sand, rubber powder, water-reducing agent, water-retaining agent, retarder, early strength agent, defoaming
Agent, the slurry being stirred until homogeneous are then allowed to stand 1min and are further continued for mandatory stirring 2min；
C) matrix surface for repairing the slurry being stirred down to needs, is smoothed out with spatula, is solidified.
Lower shrinkage self-compaction super hardening mending mortar made from embodiment 2 is subjected to physical and mechanical property test, is as a result seen
Table 2.
The physics characteristic test result of 2 embodiment 2 of table
From table 2 it can be seen that the performance indicator of the lower shrinkage self-compaction super hardening mending mortar of embodiment 2 meets JC/T
2381-2016 " mending mortar " and JG/T 336-2011 " concrete structure reparation polymer cement mortar ".
Embodiment 3
Lower shrinkage self-compaction super hardening mending mortar, the raw material including following parts by weight:
220 parts of 42.5 grades of ordinary portland cements, 160 parts of sulphur aluminum water mud, 28 parts of anhydrous gypsums, 252 parts of 0.9~2mm quartz sands,
192 parts of 0.45~0.9mm quartz sands, 120 parts of 0.22~0.45mm quartz sands, 22 parts of vinyl acetate-ethylene copolymerization rubber powders, 1 part
Hydroxypropyl methyl cellulose ether, 0.7 part of tartaric acid, the 1.2 parts of formic acid that poly carboxylic acid series water reducer, 2 parts of viscosity are 400mPas
Calcium, 0.9 part of organic silicon defoamer and 195 parts of water；
The construction technology of lower shrinkage self-compaction super hardening mending mortar, comprising the following steps:
A) interface processing
The basal plane for needing to repair digs 1~5mm to its outer, exposes new base, and clear up, in the basal plane brushing cleared up
Interfacial agents.
B) prepared by slurry
42.5 grades of ordinary portland cements, sulphur aluminum water mud, anhydrous gypsum, 0.9~2mm quartz is added into water while agitating
Sand, 0.45~0.9mm quartz sand, 0.22~0.45mm quartz sand, rubber powder, water-reducing agent, water-retaining agent, retarder, early strength agent, defoaming
Agent, the slurry being stirred until homogeneous are then allowed to stand 1min and are further continued for mandatory stirring 2min；
C) matrix surface for repairing the slurry being stirred down to needs, is smoothed out with spatula, is solidified.
Lower shrinkage self-compaction super hardening mending mortar made from embodiment 3 is subjected to physical and mechanical property test, is as a result seen
Table 3.
The physics characteristic test result of 3 embodiment 3 of table
Above description can be realized professional and technical personnel in the field or using this to stating in the disclosed embodiments
It is bright, it enables those skilled in the art to implement or use the present invention.Various modifications to these embodiments are to this field
It will be apparent for professional technician, the general principles defined herein can not depart from spirit of the invention
Or in the case where range, realize in other embodiments.Therefore, the present invention is not intended to be limited to these implementations shown in this article
Example, and it is to fit to the widest scope consistent with principles disclosed herein and novel features.
Claims (9)
1. a kind of lower shrinkage self-compaction super hardening mending mortar, which is characterized in that the raw material including following parts by weight:
2. lower shrinkage self-compaction super hardening mending mortar as described in claim 1, which is characterized in that the rubber powder is acetic acid second
Alkene-ethylene copolymer rubber powder.
3. lower shrinkage self-compaction super hardening mending mortar as described in claim 1, which is characterized in that the water-reducing agent is poly- carboxylic
Sour based water reducer.
4. lower shrinkage self-compaction super hardening mending mortar as described in claim 1, which is characterized in that the water-retaining agent is hydroxypropyl
Ylmethyl cellulose ether, viscosity 400mPas.
5. lower shrinkage self-compaction super hardening mending mortar as described in claim 1, which is characterized in that the retarder is lemon
One of sour sodium, sodium polyphosphate, tartaric acid.
6. lower shrinkage self-compaction super hardening mending mortar as described in claim 1, which is characterized in that the early strength agent is formic acid
One of calcium, calcium chloride or lithium carbonate.
7. lower shrinkage self-compaction super hardening mending mortar as described in claim 1, which is characterized in that the defoaming agent is organic
Silicon defoaming agent.
8. a kind of construction technology of lower shrinkage self-compaction super hardening mending mortar, comprising the following steps:
A) interface processing
The interface repaired will be needed to clear up, and in the basal plane brushing interfacial agents cleared up；
B) prepared by slurry
While agitating into water be added 42.5 grades of ordinary portland cements, sulphur aluminum water mud, anhydrous gypsum, 0.9~2mm quartz sand,
0.45~0.9mm quartz sand, 0.22~0.45mm quartz sand, rubber powder, water-reducing agent, water-retaining agent, retarder, early strength agent, defoaming agent,
The slurry being stirred until homogeneous is then allowed to stand 1min and is further continued for 1~2min of mandatory stirring；
C) matrix surface for repairing the slurry being stirred down to needs, is smoothed out with spatula, is solidified.
9. construction technology as claimed in claim 8, which is characterized in that the basal plane for needing to repair digs 1~5mm, dew to its outer
New base out.
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| CN111592315A (en) * | 2020-05-18 | 2020-08-28 | 江苏乐通彩业新型建材有限公司 | High-strength ground repair mortar |
| CN111574174A (en) * | 2020-05-28 | 2020-08-25 | 河北智晖建筑安装工程有限公司 | Quick-setting, quick-hardening, super-early-strength and high-crack-resistance pavement repairing material and preparation method thereof |
| CN112341119A (en) * | 2020-11-03 | 2021-02-09 | 苏州恒祥环境工程有限公司 | Preparation process of extremely-fast-setting super-early-strength ground repairing material |
| CN112679183A (en) * | 2020-12-28 | 2021-04-20 | 信阳市灵石科技有限公司 | Rapid repair mortar and preparation method thereof |
| CN112679183B (en) * | 2020-12-28 | 2022-06-03 | 信阳市灵石科技有限公司 | Rapid repair mortar and preparation method thereof |
| CN114014605A (en) * | 2021-10-25 | 2022-02-08 | 河北交规院瑞志交通技术咨询有限公司 | Self-leveling repair mortar powder, self-leveling repair mortar, preparation method and construction process thereof |
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Application publication date: 20190219 |