CN115504760A - Early-strength magnesium phosphate cement repairing material and preparation method thereof - Google Patents
Early-strength magnesium phosphate cement repairing material and preparation method thereof Download PDFInfo
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- CN115504760A CN115504760A CN202211377010.8A CN202211377010A CN115504760A CN 115504760 A CN115504760 A CN 115504760A CN 202211377010 A CN202211377010 A CN 202211377010A CN 115504760 A CN115504760 A CN 115504760A
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- 239000004568 cement Substances 0.000 title claims abstract description 68
- 239000000463 material Substances 0.000 title claims abstract description 63
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 title claims abstract description 62
- 239000004137 magnesium phosphate Substances 0.000 title claims abstract description 62
- 229960002261 magnesium phosphate Drugs 0.000 title claims abstract description 62
- 229910000157 magnesium phosphate Inorganic materials 0.000 title claims abstract description 62
- 235000010994 magnesium phosphates Nutrition 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910001868 water Inorganic materials 0.000 claims abstract description 47
- 239000000843 powder Substances 0.000 claims abstract description 40
- 239000004816 latex Substances 0.000 claims abstract description 28
- 229920000126 latex Polymers 0.000 claims abstract description 28
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims abstract description 28
- 235000019796 monopotassium phosphate Nutrition 0.000 claims abstract description 28
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 27
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 25
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 24
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims abstract description 22
- 239000010881 fly ash Substances 0.000 claims abstract description 22
- 235000019837 monoammonium phosphate Nutrition 0.000 claims abstract description 22
- 229910021538 borax Inorganic materials 0.000 claims abstract description 21
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 21
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 19
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims abstract description 18
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims description 24
- 239000002994 raw material Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 239000010754 BS 2869 Class F Substances 0.000 claims 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 3
- 230000015271 coagulation Effects 0.000 abstract 1
- 238000005345 coagulation Methods 0.000 abstract 1
- 235000012245 magnesium oxide Nutrition 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 18
- 229910019142 PO4 Inorganic materials 0.000 description 9
- 239000010452 phosphate Substances 0.000 description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 239000011083 cement mortar Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- YQRTZUSEPDULET-UHFFFAOYSA-K magnesium;potassium;phosphate Chemical compound [Mg+2].[K+].[O-]P([O-])([O-])=O YQRTZUSEPDULET-UHFFFAOYSA-K 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 238000001238 wet grinding Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- 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
- C04B28/344—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 solely as one or more phosphates
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/0013—Boron compounds
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/122—Hydroxy amines
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2623—Polyvinylalcohols; Polyvinylacetates
-
- 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
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides an early-strength magnesium phosphate cement repairing material and a preparation method thereof, wherein the early-strength magnesium phosphate cement repairing material comprises the following components: 30-35 parts of dead burned magnesium oxide, 15-20 parts of monopotassium phosphate, 5-10 parts of ammonium dihydrogen phosphate, 2-3 parts of borax, 7-10 parts of fly ash, 0.5-1.5 parts of redispersible latex powder, 0.02-0.05 part of triethanolamine and 15-25 parts of water. Compared with the prior art, the potassium dihydrogen phosphate and the ammonium dihydrogen phosphate are compounded, so that the coagulation hardening strength is higher; the borax can improve the water resistance and the hardened strength of the material; the redispersible latex powder is not easy to wet, so that the water resistance of the redispersible latex powder is greatly enhanced; the triethanolamine can not only increase the fluidity of the slurry and reduce the porosity of the hardened slurry so as to improve the strength, but also increase the interfacial bonding force between the redispersed latex powder and the hardened slurry. The invention has the effects of high strength and good water resistance under the condition of ensuring the sufficient setting time, namely the construction time.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an early-strength magnesium phosphate cement repairing material and a preparation method thereof.
Background
The magnesium phosphate cement generally takes phosphate, dead-burned magnesium oxide and a retarder as main components, has the characteristics of quick setting, early strength and low shrinkage, is often used as a repairing material for quick repair of projects such as expressways, bridges and the like, and has the application in the medical field in recent years.
The magnesium phosphate cement has the characteristics of quick hardening and early strength, the lower the water-cement ratio is, the higher the compressive strength is, the molar ratio of magnesium oxide to phosphate also influences the hydration process and products, the variety of phosphate influences the hydration products and the structure, and the hydration of the phosphate cement is also influenced by the incorporation of fly ash, bentonite and the like. Due to its excellent adhesion, it has been developed for new uses such as reinforcing bar anchor adhesives and reinforcing bar protective coatings.
Because the setting time of the repair material phosphate cement is relatively fast, and based on the actual workability requirements of engineering, retarders such as borax and the like are mostly introduced to ensure that the setting time of the repair material phosphate cement is adjustable within a certain range. According to actual performance requirements, magnesium phosphate cement is also modified, such as adding silica fume to improve impermeability, adding steel slag to improve later strength, adding glass beads to strengthen fluidity, introducing fiber to strengthen cohesive force and the like.
A patent with publication number CN114409371a published on 29/4/2022 discloses a water-resistant phosphate cement-based repair material, which is prepared from the following raw materials: the modified magnesium oxide, monopotassium phosphate, phosphoaluminate cement, silica fume, potassium chloride and additives are a water-resistant phosphate cement-based repairing material, can be applied to the rapid repair of buildings in long-term humid environments and coastal environments, and have early strength, high strength and good water stability. The modified magnesium oxide is prepared according to the following steps: (1) Adding ethanol into wet ball mill, adding calcium chloride and carbonic acidAdding potassium and triethanolamine into a wet ball mill according to the following weight parts of 1; (2) After wet grinding, centrifugal filtration is carried out to obtain slurry, and the temperature of the outer wall of the ball mill is controlled to be less than or equal to 50 ℃ in a water cooling or liquid nitrogen mode in the wet grinding process; (3) Fully mixing magnesium oxide with the slurry according to the mass ratio of 1; wherein the magnesium oxide is prepared by crushing dead-burned magnesium oxide and has specific surface area of 238-322m 2 /kg。
A patent with publication number CN113149491a published on 7/23/2021 discloses a high-water-resistance magnesium potassium phosphate repair material and a preparation method thereof, wherein the preparation raw materials comprise: magnesium oxide, potassium dihydrogen phosphate, borax, water and emulsion powder. The preparation method comprises the steps of putting magnesium oxide, monopotassium phosphate, borax and latex powder into a cement mortar stirrer according to the weight components, and uniformly stirring and mixing to obtain mixed powder; adding water into the mixed powder, stirring, filling into a mold for a certain time, and demolding after 15-20min to obtain the high-water-resistance magnesium potassium phosphate repair material. The invention has better water resistance, and improves the natural defect that phosphate cement is not water resistant to a certain extent.
Due to the characteristics of quick hardening and early strength, the magnesium phosphate cement has considerable development potential in special engineering scenes, and the natural defect of water resistance limits the application of the magnesium phosphate cement in engineering to a certain extent.
In recent years, the technology of magnesium phosphate cement repairing materials focuses on improving the water resistance, but more or less defects exist in the past research, and the technology is characterized in that an admixture or a surfactant is introduced into a mature magnesium phosphate cement system, and the water resistance is improved by increasing the compactness of a hardened slurry; or high molecular polymer is added to improve the surface performance and reduce the surface wettability of the material. The technology of simply introducing the admixture or the surfactant has no influence on the strength of the magnesium phosphate cement, but the water resistance of the magnesium phosphate cement is not greatly improved, and the magnesium phosphate cement still suffers structural damage in the environment of long-term water erosion; the technology of improving the surface performance by simply adding the high molecular polymer can greatly improve the water resistance of the magnesium phosphate cement, but the technology can reduce the strength of the magnesium phosphate cement taking monopotassium phosphate and magnesium oxide as cementing materials.
Disclosure of Invention
The invention aims to provide an early-strength magnesium phosphate cement repairing material and a preparation method thereof, which can prepare magnesium phosphate cement with higher early strength, improve the water resistance of the magnesium phosphate cement, ensure that the strength of the magnesium phosphate cement is not lost and have lower porosity.
The specific technical scheme of the invention is as follows:
an early strength type magnesium phosphate cement repair material comprises the following raw materials in parts by mass:
30-35 parts of dead burned magnesium oxide, 15-20 parts of monopotassium phosphate, 5-10 parts of ammonium dihydrogen phosphate, 2-3 parts of borax, 7-10 parts of fly ash, 0.5-1.5 parts of redispersible latex powder, 0.02-0.05 part of triethanolamine and 15-25 parts of water.
Preferably, the early-strength magnesium phosphate cement repair material comprises the following raw materials in parts by mass:
32 parts of dead burned magnesium oxide, 19 parts of monopotassium phosphate, 7 parts of ammonium dihydrogen phosphate, 3 parts of borax, 8 parts of fly ash, 1.5 parts of redispersible latex powder, 0.05 part of triethanolamine and 17 parts of water.
The dead burned magnesia is prepared by calcining magnesite powder at a high temperature of more than 1400 ℃.
The potassium dihydrogen phosphate is pure KH by chemical analysis 2 PO 4 。
The ammonium dihydrogen phosphate is chemically analytically pure NH 4 H 2 PO 4 。
The borax is chemical analysis pure Na 2 B 4 O 7 ·10H 2 O。
The fly ash is F-class first-grade fly ash.
The redispersible latex powder is PVA redispersible latex powder.
The triethanolamine is chemically analytically pure C 6 H 15 NO 3 。
The invention provides a preparation method of an early-strength magnesium phosphate cement repairing material, which comprises the following steps:
1) Weighing dead-burned magnesium oxide, monopotassium phosphate, ammonium dihydrogen phosphate, borax, fly ash and redispersible latex powder according to a formula, and uniformly stirring and mixing at a low speed to obtain premixed powder;
2) Weighing triethanolamine and water according to a formula, adding into a stirrer, adding premixed powder, starting the stirrer, and uniformly stirring to obtain magnesium phosphate cement repair material slurry;
3) Pouring out the slurry of the magnesium phosphate cement repairing material, filling the slurry into a mold, and demolding to obtain the early-strength magnesium phosphate cement repairing material.
Stirring at low speed in the step 1), wherein the stirring speed is 140-150r/min, and the stirring time is 30-45s.
Stirring in the step 2), wherein the stirring speed is 250-300r/min, and the stirring time is 30-45 s;
and 3), putting into a mold, and demolding after 15-20 min.
The invention relates to the following ideas:
the invention uses potassium dihydrogen phosphate and ammonium dihydrogen phosphate to mix in a certain proportion, compared with the magnesium phosphate cement repair material which singly uses potassium dihydrogen phosphate, the invention has higher setting and hardening strength. The fly ash is doped in the repair material, so that trace pores generated by ammonium dihydrogen phosphate reaction can be filled, and the compactness of the repair material is ensured.
After the redispersible latex powder is formed into a film, the surface wettability of the magnesium phosphate cement repairing material can be well improved, the water penetration is hindered, and the water resistance of the repairing material is improved.
The invention adds micro triethanolamine to improve the fluidity of slurry and reduce the porosity of the repaired material after hardening, and simultaneously, the triethanolamine serving as the nonionic surfactant can improve the interface bonding property between the redispersible latex powder and the magnesium phosphate hydration product and improve the strength of the magnesium phosphate cement repaired material.
Compared with the prior art, the invention can effectively improve the water resistance of the magnesium phosphate cement, simultaneously keep the strength of the magnesium phosphate cement from losing, and has lower porosity. By compounding potassium dihydrogen phosphate and ammonium dihydrogen phosphate, the intensity of the reaction is reduced, the construction time of the slurry in a flowing state is prolonged, and the engineering application is facilitated; meanwhile, compared with a system using potassium dihydrogen phosphate alone, the ammonium dihydrogen phosphate and the magnesium oxide form a magnesium phosphate hydration product with higher strength, and the material has higher strength compared with the prior art. The borax plays a role of a retarder, not only can adjust the setting time, but also can fill pores in the slurry hardening process of the fly ash, increase the structural compactness, and improve the water resistance and the hardened strength of the material. The redispersible latex powder is uniformly dispersed in the slurry by stirring, so that the surface tension of the magnesium phosphate cement repair material is increased, the magnesium phosphate cement repair material is not easy to wet, and the water resistance of the magnesium phosphate cement repair material is greatly enhanced. The triethanolamine is used as a nonionic surfactant, so that the fluidity of the slurry can be increased, the porosity of the slurry after hardening can be reduced, the strength can be improved, the interface performance of the redispersible latex powder and the hardened slurry can be improved, and the interface binding power can be increased. The invention can prepare the magnesium phosphate cement repairing material with high strength and better water resistance under the condition of ensuring the setting time, namely the sufficient construction time.
Detailed Description
The present invention will be further illustrated with reference to the following examples.
Example 1
An early-strength magnesium phosphate cement repair material comprises the following raw materials in parts by mass:
32 parts of dead burned magnesium oxide, 19 parts of monopotassium phosphate, 7 parts of ammonium dihydrogen phosphate, 3 parts of borax, 8 parts of fly ash, 1.5 parts of redispersible latex powder, 0.05 part of triethanolamine and 17 parts of water.
Example 2
An early strength type magnesium phosphate cement repair material comprises the following raw materials in parts by mass:
30 parts of dead burned magnesium oxide, 15 parts of monopotassium phosphate, 5 parts of ammonium dihydrogen phosphate, 2 parts of borax, 7 parts of fly ash, 0.5 part of redispersible latex powder, 0.02 part of triethanolamine and 15 parts of water.
Example 3
An early strength type magnesium phosphate cement repair material comprises the following raw materials in parts by mass:
35 parts of dead burned magnesium oxide, 20 parts of monopotassium phosphate, 10 parts of ammonium dihydrogen phosphate, 3 parts of borax, 10 parts of fly ash, 1.5 parts of redispersible latex powder, 0.05 part of triethanolamine and 25 parts of water.
Example 4
An early strength type magnesium phosphate cement repair material comprises the following raw materials in parts by mass:
34 parts of dead burned magnesium oxide, 16 parts of monopotassium phosphate, 6 parts of ammonium dihydrogen phosphate, 2.5 parts of borax, 9 parts of fly ash, 0.8 part of redispersible latex powder, 0.03 part of triethanolamine and 21 parts of water.
Example 5
An early strength type magnesium phosphate cement repair material comprises the following raw materials in parts by mass:
30 parts of dead burned magnesium oxide, 20 parts of monopotassium phosphate, 10 parts of ammonium dihydrogen phosphate, 2.5 parts of borax, 8 parts of fly ash, 1.3 parts of redispersible latex powder, 0.04 part of triethanolamine and 20 parts of water.
Comparative example 1
The magnesium phosphate cement repair material comprises the following raw materials in parts by mass:
comparative example 1 differs from example 1 only in that no fly ash is used in comparative example 1 and the remaining components correspond to those of example 1, i.e., comparative example 1 comprises the following components in parts by weight:
32 parts of dead burned magnesium oxide, 19 parts of monopotassium phosphate, 7 parts of ammonium dihydrogen phosphate, 3 parts of borax, 1.5 parts of redispersible latex powder, 0.05 part of triethanolamine and 17 parts of water.
Comparative example 2
The magnesium phosphate cement repair material comprises the following raw materials in parts by mass:
the comparative example 2 is different from the example 1 only in that the redispersible latex powder and the fly ash are not used in the comparative example 1, and the rest of the components are consistent with the example 1, that is, the comparative example 2 comprises the following components in parts by weight:
32 parts of dead burned magnesium oxide, 19 parts of monopotassium phosphate, 7 parts of ammonium dihydrogen phosphate, 3 parts of borax, 0.05 part of triethanolamine and 17 parts of water.
Comparative example 3
The magnesium phosphate cement repair material comprises the following raw materials in parts by mass:
comparative example 3 differs from example 1 only in that in comparative example 1 ammonium dihydrogen phosphate is replaced with the same molar amount of potassium dihydrogen phosphate, and the remaining components, in accordance with example 1, comprise the following components in parts by weight:
32 parts of dead burned magnesium oxide, 27 parts of monopotassium phosphate, 3 parts of borax, 8 parts of fly ash, 1.5 parts of redispersible latex powder, 0.05 part of triethanolamine and 17 parts of water.
The preparation method of the magnesium phosphate cement repair materials of the above examples 1 to 5 and comparative examples 1 to 3 comprises the following steps:
1) Weighing powder components except triethanolamine and water according to the formula ratio, placing the powder components in a cement mortar stirrer, and stirring and mixing the powder components uniformly at a low speed, wherein the stirring speed is 140r/min, and the stirring time is 35s to obtain premixed powder;
2) Weighing triethanolamine and water according to parts by weight, adding the triethanolamine and the water into the premixed powder together, starting a stirrer at a stirring speed of 285r/min, pouring the mixture out after uniformly stirring for 40s, filling the mixture into a mold, and demolding after 18min to obtain a test block.
The early strength type magnesium phosphate cement repair materials of examples 1 to 5 and the magnesium phosphate cement repair materials of comparative examples 1 to 3 were subjected to tests of compressive strengths at different ages and compressive strengths after being soaked in water for 28 days according to the test method for cement mortar strength of GB/T17671-2021 (ISO method), and the test results are shown in Table 1.
TABLE 1 compressive Strength test results of examples and comparative examples
As is apparent from the data in Table 1, the early strength type magnesium phosphate cement repair material provided by the invention has higher compressive strength already within 2h, has good early strength characteristic, can ensure higher compressive strength in 3d, 7d and 28d ages, has significantly higher compressive strength than the comparative example after being soaked in water for 28d, and has good water resistance.
According to the compressive strength data of the embodiment 1 and the comparative example 1, the coal ash can not only improve the water resistance of the repair material, but also improve the compressive strength of the repair material. From the compressive strength data of example 1 and comparative example 2, the influence of the redispersible latex powder on the strength is negligible, but the water resistance of the repair material can be remarkably improved. As shown by the compressive strength data of example 1 and comparative example 3, the strength of the magnesium phosphate cement repair material prepared by compounding potassium dihydrogen phosphate and ammonium dihydrogen phosphate is higher than that of the magnesium phosphate cement repair material prepared by singly using potassium dihydrogen phosphate.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. The early-strength magnesium phosphate cement repair material is characterized by comprising the following raw materials in parts by mass:
30-35 parts of dead burned magnesium oxide, 15-20 parts of monopotassium phosphate, 5-10 parts of ammonium dihydrogen phosphate, 2-3 parts of borax, 7-10 parts of fly ash, 0.5-1.5 parts of redispersible latex powder, 0.02-0.05 part of triethanolamine and 15-25 parts of water.
2. The early strength type magnesium phosphate cement repair material according to claim 1, wherein the early strength type magnesium phosphate cement repair material comprises the following raw materials in parts by mass:
32 parts of dead burned magnesium oxide, 19 parts of monopotassium phosphate, 7 parts of ammonium dihydrogen phosphate, 3 parts of borax, 8 parts of fly ash, 1.5 parts of redispersible latex powder, 0.05 part of triethanolamine and 17 parts of water.
3. The early strength type magnesium phosphate cement repair material according to claim 1, wherein the dead burned magnesium oxide is prepared by calcining magnesite powder at a high temperature of above 1400 ℃.
4. The early strength magnesium phosphate cement repair material according to claim 1, wherein the fly ash is class F first grade fly ash.
5. The early strength type magnesium phosphate cement repair material of claim 1, wherein the redispersible latex powder is a PVA redispersible latex powder.
6. A method for preparing the early strength type magnesium phosphate cement repair material according to any one of claims 1 to 5, wherein the method comprises the following steps:
1) Weighing the dead burned magnesium oxide, the monopotassium phosphate, the ammonium dihydrogen phosphate, the borax, the fly ash and the redispersible latex powder according to a formula, and uniformly stirring and mixing at a low speed to obtain premixed powder;
2) Weighing triethanolamine and water according to a formula, adding into a stirrer, adding premixed powder, starting the stirrer, and uniformly stirring to obtain magnesium phosphate cement repair material slurry;
3) Pouring out the slurry of the magnesium phosphate cement repair material, filling the slurry into a mold, and demolding to obtain the early-strength magnesium phosphate cement repair material.
7. The method according to claim 6, wherein the stirring is performed at a low speed in step 1), the stirring speed is 140 to 150r/min, and the stirring time is 30 to 45s.
8. The method according to claim 6, wherein the stirring in step 2) is performed at a stirring rate of 250 to 300r/min for a stirring time of 30 to 45s.
9. The method according to claim 6, wherein in the step 3), the mold is filled, and the mold is removed after 15 to 20 minutes.
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| CN104909709A (en) * | 2015-05-26 | 2015-09-16 | 武汉市市政建设集团有限公司 | Green rapid-hardening early-strength magnesium phosphate-based healant and preparation method thereof |
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| 俞宾辉: "建筑防水工程施工手册", vol. 1, 31 October 2004, 山东科学技术出版社, pages: 530 - 533 * |
| 范英儒等: "磷酸盐对磷酸镁水泥粘结性能的影响", 硅酸盐学报, vol. 44, no. 2, pages 218 - 225 * |
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