CN112299813A - Magnesium phosphate adhesive and application thereof - Google Patents
Magnesium phosphate adhesive and application thereof Download PDFInfo
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- CN112299813A CN112299813A CN202011109987.2A CN202011109987A CN112299813A CN 112299813 A CN112299813 A CN 112299813A CN 202011109987 A CN202011109987 A CN 202011109987A CN 112299813 A CN112299813 A CN 112299813A
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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
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- 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
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G23/0237—Increasing or restoring the load-bearing capacity of building construction elements of storey floors
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/22—Carbonation resistance
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/60—Flooring materials
- C04B2111/62—Self-levelling compositions
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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
- 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
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- Architecture (AREA)
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- Organic Chemistry (AREA)
- Materials Engineering (AREA)
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Abstract
The invention provides a magnesium phosphate adhesive, which comprises magnesium ammonium phosphate cement and aggregate; the weight ratio of the magnesium ammonium phosphate cement to the aggregate is 1: 1-1: 1.3. the invention also discloses an application of the magnesium phosphate adhesive. The invention endows the magnesium phosphate adhesive material with better fluidity by retarding and plasticizing technologies, thereby realizing construction self-leveling, simplifying construction process and shortening construction period.
Description
Technical Field
The invention relates to the technical field of adhesives, and particularly relates to a magnesium phosphate adhesive and application thereof.
Background
After a reinforced concrete structure is used for a certain period of time, corresponding structural reinforcement can be carried out according to different requirements, a reinforced concrete slab is a very important bearing structure, and the reasons for reinforcing the concrete slab mainly comprise the following points: the thickness of the floor slab does not meet the requirements; the load is considered to be over conservative during design; the reinforced concrete floor suffers from fire; the strength of the concrete does not meet the requirement, and the like. On the basis of maintaining the existing floor slab, firstly, the requirement of bearing capacity after the structure is reinforced is ensured; secondly, the requirement of headroom used by the owner is met; and finally, the detection requirements are met after reinforcement, and the reinforcement construction process has operability.
The traditional reinforcing method adopts a section increasing method, an external steel plate bonding method, a steel beam additionally arranged at the bottom of a plate, carbon fiber bonding, integral replacement and the like, wherein the section increasing method not only increases the self weight of a floor, but also sacrifices the clear space of the floor and influences the use function of the floor; the problems of clearance and structural stress can be solved by externally adhering steel plates and carbon fibers, but the steel plates are adhered with concrete plates by adopting organic adhesives, the organic adhesives are easy to age and poor in durability, and in addition, the steel structures need to be subjected to rust removal, fire prevention and corrosion prevention treatment, so that the complexity of the construction process is increased; the steel beam is additionally arranged at the bottom of the concrete slab to change the force transmission path of the floor slab, so that the bearing capacity of the floor slab is indirectly improved, but the net height of the floor slab is changed, the use function of the floor slab is influenced, the steel structure is also subjected to treatment of corrosion resistance and fire resistance, and the construction process flow is increased; if adopt whole replacement concrete floor, can satisfy bearing capacity, structural security and service function completely, but can produce a lot of building rubbish, extravagant raw and other materials, increased construction cost, make construction period extension.
The existing reinforcing method has certain limitations. Therefore, the concrete slabs need to meet not only the net high service requirement but also the corresponding specification requirement of durability, which puts high requirements on the relevant mechanical properties (the strength, the cracking property, the shrinkage property and the bonding property with the base layer of the material) and the construction performance (high construction efficiency and short construction time) of the repairing material.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a magnesium phosphate adhesive and application thereof, so as to achieve the purposes of improving the durability of a repairing material and shortening the construction period.
The magnesium phosphate adhesive provided by the invention comprises magnesium ammonium phosphate cement and aggregate; the weight ratio of the magnesium ammonium phosphate cement to the aggregate is 1: 1-1: 1.3.
preferably, the magnesium ammonium phosphate cement comprises the following components in percentage by weight: 59-64% of magnesium oxide powder, 25-30% of ammonium dihydrogen phosphate and 10-11% of composite retarder; wherein the composite retarder comprises: 46-56% of borax, 40-48% of disodium hydrogen phosphate and 3-7% of organic acid.
Preferably, the magnesium oxide powder comprises a mineral admixture, and the content of the mineral admixture is 10-30% of the weight of the magnesium oxide powder; the mineral admixture comprises 0-100% of fly ash and 0-100% of metakaolin.
Preferably, the magnesium phosphate adhesive further comprises a set-retarding plasticizer, and the content of the set-retarding plasticizer is 1-3% of that of the magnesium ammonium phosphate cement.
Preferably, the retarding plasticizer is sodium silicate, and the modulus of the retarding plasticizer is 2.8-4.0.
Preferably, the aggregate is quartz sand; the quartz sand comprises the following components in percentage by weight: the grain diameter is 50-70% when the grain diameter is 2-4mm, and 30-70% when the grain diameter is 3-5 mm.
The relevant performance indexes of the raw materials involved in the scheme are as follows:
the magnesia powder is prepared by calcining magnesite at a high temperature of more than 1500 ℃, wherein the purity of the magnesia is more than 90 percent, the mesh number is 180-220 meshes, and the magnesia powder plays a role in providing magnesium ions for the adhesive.
The ammonium dihydrogen phosphate is a white and glossy crystal, the industrial-grade purity is up to 98%, and the ammonium dihydrogen phosphate is used for providing phosphate ions and ammonium ions for the adhesive.
The mesh number of the mineral admixture 1 (metakaolin) is 1250-3000 meshes, and the mineral admixture has the functions of improving the early strength and delaying the initial setting time; the mineral admixture 2 (fly ash) is technical class I fly ash, which functions to improve flowability and suitably extend setting time.
In the compound retarder, borax adopts industrial grade, is white tasteless crystal and is a main material of the retarder; the disodium hydrogen phosphate is an industrial grade white tasteless crystal, and mainly has the functions of regulating the pH value, regulating the fluidity and absorbing heat; the organic acid is of industrial grade, and mainly plays a role in retarding coagulation, so that the initial setting time of the magnesium phosphate cement is prolonged, and the later strength is improved.
The retarding plasticizer is industrial-grade sodium silicate (commonly called sodium silicate), the modulus of the retarding plasticizer is 2.8-4, and the toughness and the compactness of the phosphate adhesive are mainly improved, so that the strength and the durability of the phosphate adhesive are improved.
The aggregate mainly comprises quartz sand with different particle sizes, wherein the particle sizes of the quartz sand are smaller than 5mm, wherein the ratio of 2-4mm to 50-70% is larger, and the ratio of 3-5mm to 30-50% is larger; the quartz sand is a water treatment filter material formed by crushing, washing, drying and secondary screening natural quartz ore, the main component of the quartz sand is silicon dioxide, and the quartz sand not only improves the compressive strength of magnesium phosphate cement, but also enables the magnesium phosphate cement to be more compact and the internal pores to be reduced.
The invention also provides application of the magnesium phosphate adhesive in reinforcing the bottom of a concrete floor slab.
Preferably, the process of reinforcing comprises the steps of:
s1, chiseling the bottom of the concrete floor slab, removing dust on the surface of the chiseling part, and thoroughly soaking the slab bottom with water to prevent the slab bottom layer from absorbing moisture in the magnesium phosphate adhesive in the construction process;
s2, nailing test blocks with corresponding pouring thicknesses (the test blocks are convenient for controlling the pouring thicknesses) on the bottom of the plate, erecting a template, coating a release agent on the surface of the template, wherein the release agent is convenient for demoulding of the template, and meanwhile, the template is erected while keeping an absolute level without a slope so as to avoid influencing the fluidity of the phosphate adhesive; the template is strip-shaped, and is arranged on the bottom of the template at intervals; before the template is erected, a pouring hole, an observation hole and an exhaust hole are formed in the template;
and S3, pouring the magnesium phosphate adhesive in the pouring hole by adopting a hydraulic pouring pump, simultaneously assisting with vibration, and removing the mold after pouring for 6-7 h.
Preferably, the casting time is not more than 20min, and the casting temperature is lower than 35 ℃; the concrete is vibrated continuously and construction is kept continuously in the pouring process, ice water can be adopted for stirring when necessary, and hot water is adopted for stirring when construction is carried out under the condition of negative temperature so as to promote the early hydration and condensation time and improve the early strength; during the construction process, test blocks with the sizes of 40mm multiplied by 160mm prism test blocks and 70.7mm multiplied by 70.7mm are manufactured under the same conditions to carry out the strength detection of different ages.
Preferably, when the magnesium phosphate adhesive is poured, firstly, mixing the ammonium dihydrogen phosphate, the borax, the organic acid, the retarding plasticizer, the disodium hydrogen phosphate and 1/3 total weight of water, stirring for 2-3min, then adding magnesia powder or a mixture of the magnesia powder and a mineral admixture, mixing with 1/3 total weight of water, stirring for 2-3min, finally adding quartz sand and the rest water, mixing, and stirring for 2-3 min; the total weight of the water is 12-14% of the total weight of the magnesium oxide powder or the total weight of the mixture of the magnesium oxide powder and the mineral admixture.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention endows the magnesium phosphate adhesive material with better fluidity by retarding and plasticizing technologies, thereby realizing construction self-leveling, simplifying construction process and shortening construction period.
(2) The invention realizes the excellent characteristics of high early stage and high strength, strong bonding force with old concrete, approximate linear expansion coefficient, micro-expansibility during hardening and the like of the magnesium phosphate adhesive material by a modification technology, not only can reduce the design thickness of the repairing material and improve the indoor clear space, but also can ensure large-area repairing without cracks.
(3) The invention realizes the good fire resistance and durability of the magnesium phosphate adhesive material by a modification technology, and further can improve the anti-carbonization capability and the fire resistance of the repaired and reinforced concrete structure.
(4) The invention adopts construction measures such as bar planting at the pouring orifice and the like to further enhance the bonding force of the magnesium phosphate adhesive material and the old concrete and better form a whole.
Drawings
Fig. 1 is a schematic diagram of the arrangement of the bottom forms of the concrete slabs in embodiments 1 to 3 of the present invention.
Fig. 2 is a schematic view of the slab bottom casting of concrete slabs in examples 1-3 of the present invention.
FIG. 3 is a graph showing the tensile bond strength after the plate bottom is reinforced in examples 1 to 3 of the present invention.
FIG. 4 is a graph showing the flexural strength of the reinforced plate bottom in examples 1 to 3 of the present invention.
FIG. 5 is a graph showing the compressive strength of the reinforced plate bottom in examples 1 to 3 of the present invention.
Wherein, 1, test block; 2. a template; 3. pouring holes; 4. an observation hole; 5. an exhaust hole; 6. and (3) a magnesium phosphate adhesive.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit and substance of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
Example 1
The magnesium phosphate adhesive comprises magnesium ammonium phosphate cement and quartz sand; the weight ratio of the magnesium ammonium phosphate cement to the quartz sand is 1: 1.
wherein, according to the weight percentage, the magnesium ammonium phosphate cement comprises: 64% of magnesium oxide powder, 25% of ammonium dihydrogen phosphate and 11% of composite retarder; the composite retarder comprises: 46% of borax, 48% of disodium hydrogen phosphate and 3% of organic acid; the quartz sand includes: 70% of particle size 2-4mm and 30% of particle size 3-5 mm.
Referring to fig. 1-2, the process of the magnesium phosphate adhesive in the reinforcement of the concrete floor slab bottom comprises the following steps:
s1, chiseling the bottom of the concrete floor slab, removing dust on the surface of the chiseling part, and thoroughly soaking the bottom of the concrete floor slab by water;
s2, nailing a test block 1 with a corresponding pouring thickness into the bottom of the template, supporting a template 2, and coating a release agent on the surface of the template 2; the template 2 is strip-shaped and is arranged on the bottom of the template at intervals; before the formwork is erected, a pouring hole 3, an observation hole 4 and an exhaust hole 5 are formed in the formwork 2;
and S3, pouring the magnesium phosphate adhesive in the pouring hole 3 by adopting a hydraulic pouring pump, simultaneously assisting with vibration, and removing the mold after pouring for 7 hours.
Wherein the pouring time is 20min, and the pouring temperature is 34 ℃.
When the magnesium phosphate adhesive is poured, firstly, mixing the ammonium dihydrogen phosphate, the borax, the organic acid, the retarding plasticizer, the disodium hydrogen phosphate and 1/3 total weight of water, stirring for 3min, then adding magnesia powder or a mixture of the magnesia powder and a mineral admixture, mixing with 1/3 total weight of water, stirring for 2min, finally adding quartz sand and the rest water, mixing and stirring for 3 min; the total weight of the water is 12 percent of the total weight of the magnesium oxide powder or the total weight of the mixture of the magnesium oxide powder and the mineral admixture.
The embodiment accelerates the construction progress, improves the turnover rate of the template, improves the indoor clearance, and improves the fire resistance and the durability of the material.
Example 2
The magnesium phosphate adhesive comprises magnesium ammonium phosphate cement and quartz sand; the weight ratio of the magnesium ammonium phosphate cement to the quartz sand is 1: 1.3.
wherein, according to the weight percentage, the magnesium ammonium phosphate cement comprises: 59% of magnesium oxide powder, 30% of ammonium dihydrogen phosphate and 10% of composite retarder; wherein the composite retarder comprises: 56% of borax, 40% of disodium hydrogen phosphate and 7% of organic acid; the magnesium oxide powder comprises a mineral admixture, and the content of the mineral admixture is 10% of the weight of the magnesium oxide powder; the mineral admixture comprises 60% of fly ash and 40% of metakaolin; the quartz sand includes: the grain diameter is 50 percent when the grain diameter is 2-4mm and 70 percent when the grain diameter is 3-5 mm.
The magnesium phosphate adhesive also comprises sodium silicate, the modulus of the sodium silicate is 4.0, and the content of the sodium silicate is 1% of that of the magnesium ammonium phosphate cement.
Referring to fig. 1-2, the process of the magnesium phosphate adhesive in the reinforcement of the concrete floor slab bottom comprises the following steps:
s1, chiseling the bottom of the concrete floor slab, removing dust on the surface of the chiseling part, and thoroughly soaking the bottom of the concrete floor slab by water;
s2, nailing a test block 1 with a corresponding pouring thickness into the bottom of the template, supporting a template 2, and coating a release agent on the surface of the template 2; the template 2 is strip-shaped and is arranged on the bottom of the template at intervals; before the formwork is erected, a pouring hole 3, an observation hole 4 and an exhaust hole 5 are formed in the formwork 2;
and S3, pouring the magnesium phosphate adhesive in the pouring hole 3 by adopting a hydraulic pouring pump, simultaneously assisting with vibration, and removing the mold after pouring for 6 hours.
Wherein the pouring time is 18min, and the pouring temperature is 30 ℃.
When the magnesium phosphate adhesive is poured, firstly, mixing the ammonium dihydrogen phosphate, the borax, the organic acid, the retarding plasticizer, the disodium hydrogen phosphate and 1/3 total weight of water, stirring for 2-3min, then adding magnesia powder or a mixture of the magnesia powder and a mineral admixture, mixing with 1/3 total weight of water, stirring for 3min, finally adding quartz sand and the rest water, mixing and stirring for 2 min; the total weight of the water is 14 percent of the total weight of the magnesium oxide powder or the total weight of the mixture of the magnesium oxide powder and the mineral admixture.
The embodiment accelerates the construction progress, improves the turnover rate of the template, improves the indoor clearance, and improves the fire resistance and the durability of the material.
Example 3
The magnesium phosphate adhesive comprises magnesium ammonium phosphate cement and quartz sand; the weight ratio of the magnesium ammonium phosphate cement to the quartz sand is 1: 1.2.
wherein, according to the weight percentage, the magnesium ammonium phosphate cement comprises: 62% of magnesium oxide powder, 27% of ammonium dihydrogen phosphate and 10.5% of composite retarder; wherein the composite retarder comprises: 50% of borax, 45% of disodium hydrogen phosphate and 5% of organic acid; the magnesium oxide powder comprises a mineral admixture, and the content of the mineral admixture is 30% of the weight of the magnesium oxide powder; the mineral admixture comprises 20% of fly ash and 80% of metakaolin; the quartz sand includes: 60% of the particle size of 2-4mm and 50% of the particle size of 3-5 mm.
The magnesium phosphate adhesive also comprises a magnesium phosphate adhesive, wherein the modulus of the magnesium phosphate adhesive is 2.8, and the content of the sodium silicate is 3% of that of the magnesium ammonium phosphate cement.
Referring to fig. 1-2, the process of the magnesium phosphate adhesive in the reinforcement of the concrete floor slab bottom comprises the following steps:
s1, chiseling the bottom of the concrete floor slab, removing dust on the surface of the chiseling part, and thoroughly soaking the bottom of the concrete floor slab by water;
s2, nailing a test block 1 with a corresponding pouring thickness into the bottom of the template, supporting a template 2, and coating a release agent on the surface of the template 2; the template 2 is strip-shaped and is arranged on the bottom of the template at intervals; before the formwork is erected, a pouring hole 3, an observation hole 4 and an exhaust hole 5 are formed in the formwork 2;
and S3, pouring the magnesium phosphate adhesive in the pouring hole 3 by adopting a hydraulic pouring pump, simultaneously assisting with vibration, and removing the mold after pouring for 6.5 h.
Wherein the pouring time is 15min, and the pouring temperature is 25 ℃.
When the magnesium phosphate adhesive is poured, firstly, mixing the ammonium dihydrogen phosphate, the borax, the organic acid, the retarding plasticizer, the disodium hydrogen phosphate and 1/3 total weight of water, stirring for 2.5min, then adding magnesia powder or a mixture of the magnesia powder and a mineral admixture, mixing with 1/3 total weight of water, stirring for 2.5min, finally adding quartz sand and the rest water, mixing and stirring for 2.5 min; the total weight of the water is 13 percent of the total weight of the magnesium oxide powder or the total weight of the mixture of the magnesium oxide powder and the mineral admixture.
The embodiment accelerates the construction progress, improves the turnover rate of the template, improves the indoor clearance, and improves the fire resistance and the durability of the material.
The fluidity of the magnesium phosphate adhesive in the examples 1 to 3 is 190mm, 236mm and 260mm, and the test results of the positive tensile bond strength, the breaking strength and the compressive strength are shown in the figures 3 to 5, wherein A0 is example 1, A1 is example 2, and A2 is example 3.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The magnesium phosphate adhesive is characterized by comprising magnesium ammonium phosphate cement and aggregate; the weight ratio of the magnesium ammonium phosphate cement to the aggregate is 1: 1-1: 1.3.
2. the magnesium phosphate adhesive of claim 1, wherein the magnesium ammonium phosphate cement comprises, in weight percent: 59-64% of magnesium oxide powder, 25-30% of ammonium dihydrogen phosphate and 10-11% of composite retarder; wherein the composite retarder comprises: 46-56% of borax, 40-48% of disodium hydrogen phosphate and 3-7% of organic acid.
3. The magnesium phosphate adhesive of claim 2, wherein the magnesium oxide powder comprises a mineral admixture in an amount of 10 to 30% by weight of the magnesium oxide powder; the mineral admixture comprises 0-100% of fly ash and 0-100% of metakaolin.
4. The magnesium phosphate adhesive according to claim 1, further comprising a set-retarding plasticizer, wherein the set-retarding plasticizer is 1-3% of the magnesium ammonium phosphate cement.
5. The magnesium phosphate adhesive of claim 4, wherein the set retarding plasticizer is sodium silicate having a modulus of 2.8 to 4.0.
6. The magnesium phosphate adhesive according to any one of claims 1 to 5, wherein the aggregate is quartz sand; the quartz sand comprises the following components in percentage by weight: the grain diameter is 50-70% when the grain diameter is 2-4mm, and 30-70% when the grain diameter is 3-5 mm.
7. Use of a magnesium phosphate adhesive as claimed in any one of claims 1 to 6 for floor reinforcement of concrete floors.
8. Use according to claim 7, wherein said process of consolidating comprises the following steps:
s1, chiseling the bottom of the concrete floor slab, removing dust on the surface of the chiseling part, and thoroughly soaking the bottom of the concrete floor slab by water;
s2, nailing test blocks with corresponding pouring thicknesses into the bottom of the template, supporting the template, and coating a release agent on the surface of the template; the template is strip-shaped, and is arranged on the bottom of the template at intervals; before the template is erected, a pouring hole, an observation hole and an exhaust hole are formed in the template;
and S3, pouring the magnesium phosphate adhesive in the pouring hole by adopting a hydraulic pouring pump, simultaneously assisting with vibration, and removing the mold after pouring for 6-7 h.
9. Use according to claim 8, wherein the casting time is not more than 20min and the casting temperature is less than 35 ℃.
10. The use of claim 8 or 9, wherein when the magnesium phosphate adhesive is used for pouring, the ammonium dihydrogen phosphate, the borax, the organic acid, the retarding plasticizer, the disodium hydrogen phosphate and 1/3 total weight of water are mixed and stirred for 2-3min, then the magnesium oxide powder or the mixture of the magnesium oxide powder and the mineral admixture and 1/3 total weight of water are added and mixed and stirred for 2-3min, and finally the quartz sand and the rest of water are added and mixed and stirred for 2-3 min; the total weight of the water is 12-14% of the total weight of the magnesium oxide powder or the total weight of the mixture of the magnesium oxide powder and the mineral admixture.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112900849A (en) * | 2021-02-25 | 2021-06-04 | 中建八局第四建设有限公司 | Formwork splicing seam treatment construction method capable of being rotated |
| CN113149498A (en) * | 2021-03-21 | 2021-07-23 | 苏州诚开新材料有限公司 | Composite retarder, preparation method thereof and application thereof in magnesium ammonium phosphate cement |
| CN113321484A (en) * | 2021-08-02 | 2021-08-31 | 天津市北洋水运水利勘察设计研究院有限公司 | Magnesium phosphate cement-based sulfate-resistant marine repair reinforcing material and preparation method thereof |
| CN113860788A (en) * | 2021-11-03 | 2021-12-31 | 盐城工学院 | Composite retarder suitable for magnesium phosphate cement |
| CN115448687A (en) * | 2022-10-18 | 2022-12-09 | 中铁第四勘察设计院集团有限公司 | Magnesium ammonium phosphate cement-based composite material and preparation method and application thereof |
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| CN113321484A (en) * | 2021-08-02 | 2021-08-31 | 天津市北洋水运水利勘察设计研究院有限公司 | Magnesium phosphate cement-based sulfate-resistant marine repair reinforcing material and preparation method thereof |
| CN113860788A (en) * | 2021-11-03 | 2021-12-31 | 盐城工学院 | Composite retarder suitable for magnesium phosphate cement |
| CN115448687A (en) * | 2022-10-18 | 2022-12-09 | 中铁第四勘察设计院集团有限公司 | Magnesium ammonium phosphate cement-based composite material and preparation method and application thereof |
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