CN105174901A - High-performance potassium magnesium phosphate cement mortar and preparation method thereof - Google Patents
High-performance potassium magnesium phosphate cement mortar and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a preparation method of high-performance potassium magnesium phosphate cement mortar. The preparation method comprises the following steps: 1, taking dead burned magnesium oxide powder as an alkaline component and potassium dihydrogen phosphate as an acidic component, and doping a compound retarder to prepare potassium magnesium phosphate cement; 2, preparing a gelling component of the potassium magnesium phosphate cement mortar from the potassium magnesium phosphate cement, silica fume and ferrous sulfate; 3, mixing common river sand with limestone sand to prepare a fine aggregate of the potassium magnesium phosphate cement mortar; and 4, mixing the gelling component prepared in the step 2 and the fine aggregate prepared in the step 3 with water to prepare the potassium magnesium phosphate cement mortar. For the potassium magnesium phosphate cement mortar prepared by the method disclosed by the invention, the coagulation time is controllable, the hydration heat is released stage by stage, the high early strength and later strength are increased continuously, the water stability is high, the volume shrinkage is small, the aggregate cement ratio is high, the aggregate resource is rich, the price is low, and the bonding strength with an ordinary silicate concrete component is high. The high-performance potassium magnesium phosphate cement mortar disclosed by the invention is simple in preparation process, convenient to use, energy-saving, environment-friendly and relatively low in cost.
Description
Technical field
The present invention relates to a kind of novel civil engineering material, especially a kind of high-performance phosphate cement sill, particularly a kind of high-performance potassium magnesium phosphate sand-cement slurry and preparation method thereof, belongs to civil engineering work material technical field.
Background technology
Magnesium phosphate cement is by dead roasting magnesium oxide, soluble phosphate and admixture etc. according to a certain percentage, and what generated by soda acid chemical reaction and physical action in acid condition is the inorganic coagulation material cohering phase with phosphoric acid salt; Such material, at normal temperatures by chemical bonds, has possessed the principal feature of silicates gelling material and stupalith, namely low-temperature curing, high early strong, high volume stability, cohesiveness are strong, hardenite partial neutral etc.Phosphoric acid salt in magnesium phosphate cement can react with the hydrated product in normal concrete or unhydrated clinker particles and generate the same calcium phosphate product with gelling, therefore with the bonding interface of silicate concrete near, except physical bond effect, also there is very strong chemical bonding effect, cohesiveness is higher; After the soda acid component chance water of magnesium phosphate cement, neutralization reaction is rapid, and strength development is fast, and when early strength is especially little, intensity is very high, and this is that ordinary Portland cement or even quick hardening sulphoaluminate cement etc. are all incomparable; The water-cement ratio of magnesium phosphate cement sill slurry is low, and the shrinkage strain of hydration and hardening process is only 1/10th of silicate cement sill, and volume stability is good; The thermal expansivity of magnesium phosphate cement sill and normal silicate concrete very close, between thermal characteristics coupling very well.Above-mentioned advantage makes magnesium phosphate cement sill become one of optimal repairing and reinforcing material of concrete structure.In the compounding process of magnesium phosphate cement sill, the control of time of coagulation and water stability is gordian technique.The condensation of magnesium phosphate cement sill is fast, and hydration heat concentrates release in early days, and this all has a negative impact to constructing operation and later stage performance, limits its use range.Magnesium phosphate cement sill contacts with water for a long time, there is water-soluble erosion phenomenon, and the intensity that the water curing intensity of test specimen compares same natural curing in the length of time has reduction in various degree, and water stability has much room for improvement, and which has limited its use under water surrounding.Aggregate has material impact to the intensity of magnesium phosphate cement sill, water stability and volume stability.Existing quartz sand, aluminum oxide sand, magnesium oxide sand and granite, as fine aggregate, can prepare the magnesium phosphate cement mortar of high strength, but quartz sand, aluminum oxide sand, magnesium oxide sand and granite resource are limited, expensive, limit it and use; Though common river sand and Wingdale abundance and with low cost, aggregate volume (best aggregatecement ratio is 1) and the intensity of the magnesium phosphate cement mortar of preparation are all lower, remain to be further improved.
Summary of the invention
The present invention seeks to:, hydration heat fast for the condensation of traditional magnesium phosphate cement sill concentrates the problems such as release, water stability are poor, high and aggregatecement ratio is low to the quality requirements of aggregate in early days, proposes a kind of high-performance potassium magnesium phosphate sand-cement slurry and preparation method thereof.Potassium magnesium phosphate sand-cement slurry time of coagulation prepared by the method is controlled, hydration heat discharges stage by stage, high early strong and later strength sustainable growth, water stability is high, volumetric shrinkage is little, aggregatecement ratio is high, aggregate resources enriches and price is low, high with the cohesive strength of normal silicate concrete member, this present invention is simple, easy to use, energy-conserving and environment-protective, cost are lower.
Technical scheme of the present invention is: a kind of preparation method of high-performance potassium magnesium phosphate sand-cement slurry, comprises the following steps:
Step one: get dead roasting magnesia powder as alkaline constituent, potassium primary phosphate is as acidic components, and mix compound retarder, be mixed with potassium magnesium phosphate cement, wherein, the mass ratio of described dead roasting magnesia powder, described potassium primary phosphate and described compound retarder is followed successively by 60 ~ 67:33 ~ 40:8 ~ 12;
Step 2: get the gelling component that the obtained potassium magnesium phosphate cement of described step one, silicon ash and ferrous sulfate are mixed with potassium magnesium phosphate sand-cement slurry, wherein, the mass ratio of described potassium magnesium phosphate cement, silicon ash and ferrous sulfate is followed successively by 85 ~ 93:5 ~ 10:0.25 ~ 0.50;
In prepared potassium magnesium phosphate cement, mixing silicon ash and ferrous sulfate reasonable adjusting, it forms structure, obtains the potassium magnesium phosphate cement based gelling component of high strength and water stability.
Step 3: get the fine aggregate that common river sand and limestone sand are mixed and made into potassium magnesium phosphate sand-cement slurry, wherein, described common river sand and described limestone sand mass ratio are followed successively by 25 ~ 50:50 ~ 75;
The two component fine aggregate of the rational potassium magnesium phosphate sand-cement slurry of grating is obtained by the ratio of reasonable adjusting common river sand and limestone sand.
Step 4: the fine aggregate getting gelling component that step 2 obtains, step 3 obtained mixes with water, make potassium magnesium phosphate sand-cement slurry, wherein, the mass ratio of described fine aggregate and gelling component is followed successively by 1.25 ~ 1.5:1, and the quality of outer water mixing accounts for 0.12 ~ 0.15 of gelling component quality.
This step, by reasonable adjusting aggregatecement ratio and water-cement ratio, improves the volume stability of potassium magnesium phosphate sand-cement slurry, water stability and intensity.
In no particular order, the order of described step 3 and step one in no particular order for the order of described step 3 and step 2.
The present invention, on the basis of technique scheme, also comprises following preferred version:
Also comprise step 5: by potassium magnesium phosphate cement mortar specimen 3 ~ 6h demoulding of forming, be placed in the warm water maintenance 3 ~ 24h of 30 ~ 50 DEG C, then under natural air environment maintenance to regulation the length of time.The maintenance measure of the early stage warm water soaking of aquation is set and controls the warm water soaking time, to improve intensity and the water stability of potassium magnesium phosphate sand-cement slurry hardenite.
In described step one, described compound retarder is made up of sodium tetraborate, disodium hydrogen phosphate dodecahydrate and inorganic villaumite.
In described step one, massfraction>=90% of MgO in described dead roasting magnesia powder, the specific surface area of dead roasting magnesia powder is 200 ~ 220m
2/ kg.
In described step one, described potassium primary phosphate is PHOSPHORIC ACID TECH.GRADE potassium dihydrogen, the main granularity of this potassium primary phosphate be 40/350 ~ 60/245 order/μm.
In described step 2, SiO in described silicon ash
2massfraction>=75%, the specific surface area of described silicon ash is 20000 ~ 28000m
2/ kg.
In described step 2, described ferrous sulfate is technical grade ferrous sulfate.
In described step 3, described common river sand is medium sand, and its fineness modulus is 2.3 ~ 3.0.
In described step 3, described limestone sand screens out the stone flour of below 0.315mm and the coarse particles of more than 5mm by aggregate chips and obtains, and its fineness modulus is 3.4 ~ 4.0.
A kind of high-performance potassium magnesium phosphate sand-cement slurry adopting aforesaid method to be prepared from.
Advantage of the present invention is:
1, the present invention passes through composition structure and the volume of reasonable adjusting compound retarder, the time of coagulation of controllable potassium magnesium phosphate sand-cement slurry was 20 ~ 60 minutes scopes, hydration heat discharges stage by stage, comprise preinduction period, inductive phase, acceleration period, deceleration phase and stationary phase, solve that the condensation of potassium magnesium phosphate sand-cement slurry is fast, construction poor operability and hydration heat concentrate the problems such as release in early days.
2, the present invention by mixing appropriate silicon ash and ferrous sulfate in potassium magnesium phosphate cement, effectively improve the microstructure of potassium magnesium phosphate cement based gelling component hardenite, and then improve intensity and the water stability of potassium magnesium phosphate sand-cement slurry, make its 60d folding strength raising 5 ~ 10%, 60d ultimate compression strength raising 10 ~ 20% and 60d water curing residual intensity rate improve 10 ~ 20%.
3, the present invention is by being mixed in proportion common river sand thinner for particle diameter and the thicker limestone sand of particle diameter, improve the grain composition of fine aggregate, make the best aggregatecement ratio of potassium magnesium phosphate sand-cement slurry improve 25 ~ 50%, 60d ultimate compression strength and improve 15 ~ 30%, shrinkage strain reduces 30 ~ 60%.
4, the warm water maintenance 3 ~ 24h of the present invention by the potassium magnesium phosphate cement mortar specimen after the demoulding being placed in 30 ~ 50 DEG C, then under natural air environment maintenance to regulation the length of time, make the 3d intensity of potassium magnesium phosphate sand-cement slurry improve 10 ~ 20%, 60d intensity and improve 5 ~ 10%.
5, the present invention is through obtained potassium magnesium phosphate sand-cement slurry, and the presetting period, hydration heat discharged stage by stage 20 ~ 60 minutes scopes; The anti-folding of 3d is 8 ~ 11MPa, ultimate compression strength is 50 ~ 65MPa; 60d folding strength is 10 ~ 13MPa, ultimate compression strength is 65 ~ 75MPa; 60d water curing residual intensity rate is 90 ~ 120%; 60d shrinkage strains is 5 ~ 10 × 10-5.With the 3d cohesive strength of old concrete be 4.5 ~ 5.5MPa, 60d cohesive strength is 6.0 ~ 7.5MPa.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is preparation technology's flow process of high-performance potassium magnesium phosphate sand-cement slurry of the present invention.The preparation of high-performance potassium magnesium phosphate sand-cement slurry can be divided into four-stage by the technological process according to Fig. 1: the first stage is the preparation of potassium magnesium phosphate cement based gelling component of time of coagulation controlled, high strength, high water stability, subordinate phase is the preparation of the two component fine aggregate of the rational potassium magnesium phosphate sand-cement slurry of grating, phase III is the preparation of the potassium magnesium phosphate sand-cement slurry of high-performance and high aggregatecement ratio, and fourth stage is the design of the rational conservation system improving potassium magnesium phosphate sand-cement slurry hardenite intensity and water stability.
Fig. 2 is the initial hydration temperature changing curve diagram of high-performance potassium magnesium phosphate sand-cement slurry.
Fig. 3 is the shrinkage strains progress curve figure of high-performance potassium magnesium phosphate sand-cement slurry in initial 60d.
Fig. 4 is one of SEM figure of potassium magnesium phosphate sand-cement slurry hardenite sample prepared by embodiment one;
Fig. 5 is two of the SEM figure of potassium magnesium phosphate sand-cement slurry hardenite sample prepared by embodiment one;
Fig. 6 is the SEM figure of the hardenite prepared with potassium magnesium phosphate cement based gelling component in embodiment one.
Embodiment:
Below in conjunction with specific embodiment, such scheme is described further.Should be understood that these embodiments not limit the scope of the invention for illustration of the present invention.The implementation condition adopted in embodiment can do further adjustment according to the condition of Specific construction unit, and not marked implementation condition is generally the condition in normal experiment.
Specific embodiment mode:
Embodiment one
Step one, the dead roasting magnesia powder getting 60 mass parts is as the potassium primary phosphate of alkaline constituent and 40 mass parts as acidic components, and 8 mass parts compound retarders, preparation is greater than the potassium magnesium phosphate cement of 0.5 hour time of coagulation.Described compound retarder is made up of sodium tetraborate, disodium hydrogen phosphate dodecahydrate and inorganic villaumite, and in compound retarder, each composition quality ratio is followed successively by, sodium tetraborate: disodium hydrogen phosphate dodecahydrate: inorganic villaumite=1:3:2.
It should be noted that, in this step one, the mass ratio of described dead roasting magnesia powder, potassium primary phosphate and compound retarder is non-essential is 60:40:8.Contriver finds through great many of experiments, and in order to reach object of the present invention, the mass ratio of described dead roasting magnesia powder, potassium primary phosphate and compound retarder is preferably in 60 ~ 67:33 ~ 40:8 ~ 12 scope.
In this step one, in described dead roasting magnesia powder, preferably >=90%, the specific surface area of dead roasting magnesia powder is preferably 200 ~ 220m2/kg to the massfraction of MgO.Described potassium primary phosphate generally adopts PHOSPHORIC ACID TECH.GRADE potassium dihydrogen, the main granularity of this potassium primary phosphate be preferably 40/350 ~ 60/245 order/μm, " order/μm " is the measure unit after numerical value " 40/350 ~ 60/245 ".
Step 2, gets 90 mass parts potassium magnesium phosphate cement (step one obtains), 10 mass parts silicon ash and 0.25 mass parts ferrous sulfate, is mixed to get gelling component.
In this step 2, it is 90:10:0.25 that the mass ratio of described potassium magnesium phosphate cement, silicon ash and ferrous sulfate is followed successively by non-essential.Contriver finds through great many of experiments, and in order to reach object of the present invention, the mass ratio of described potassium magnesium phosphate cement, silicon ash and ferrous sulfate is preferably in 85 ~ 93:5 ~ 10:0.25 ~ 0.5 scope.
In this step 2, SiO in described silicon ash
2massfraction preferably>=75%, the specific surface area of silicon ash is preferably 20000 ~ 28000m
2/ kg.Described ferrous sulfate generally adopts technical grade ferrous sulfate.
33 quality are divided common river sand and the mixing of 67 mass parts limestone sands by step 3, and obtain grating reasonably two component fine aggregate, its basic physical parameters is in table 1.
In this step 3, described common river sand and described limestone sand mass ratio non-essential be 33:67.Contriver finds through great many of experiments, and in order to reach object of the present invention, common river sand and described Wingdale are preferably in the scope of 25 ~ 50:50 ~ 75.
At this in rapid three, described common river sand is medium sand, and its fineness modulus is 2.3 ~ 3.0.Described limestone sand screens out the stone flour of below 0.315mm and the coarse particles of more than 5mm by aggregate chips and obtains, and its fineness modulus is 3.4 ~ 4.0.
This step 3 can be carried out before above-mentioned steps two, also can carry out before above-mentioned steps one.
Step 4, gets 40 mass parts gelling components (step 2 obtains) and 60 mass parts fine aggregates (step 3 obtains), gets the water of 5.2 mass parts outward.First gelling component is added the agitator kettle of planetary cement mortar mixer, add the water of 80%, the manual governing shelves of stirrer are started after placing, low rate mixing 1 minute, rapid stirring 1 minute, rear continuation low rate mixing, adds from hopper slowly by fine aggregate, add the water of residue 20%, low rate mixing is after 2 minutes, and rapid stirring 1 minute, is newly mixed potassium magnesium phosphate sand-cement slurry.
In this step 4, the mass ratio of described gelling component, fine aggregate and water is non-essential is 40:60:5.2, contriver finds through great many of experiments, in order to reach object of the present invention, the mass ratio of described fine aggregate and gelling component is preferably 1.25 ~ 1.5:1, and the quality of outer water mixing accounts for 0.12 ~ 0.15 of gelling component total mass.
200g mortar is put into a thermally insulated container (5min completes, therebetween with the change of thermometer test mortar initial temperature), thermopair is inserted in slurry, by the temperature variation of slurry during automatic temp. recorder record aquation.According to the shrinkage strains of the test specimen test potassium magnesium phosphate sand-cement slurry of standard JC/T603-2004 shaping 25mm × 25mm × 280mm.According to standard GB/T17671-1999 shaping test piece, the anti-folding of test potassium magnesium phosphate sand-cement slurry and ultimate compression strength.40mm × 40mm × 160mm concrete test block (adopting the stone of 525 ordinary portland cements, standard sand and particle diameter 5 ~ 10mm to prepare) is prepared by C40, be placed in maintenance 28d under normal curing condition, with hacksaw, test specimen is sawed-off from centre, wherein will put into die trial by half bar concrete, second half cast potassium magnesium phosphate sand-cement slurry.Under the test specimen of forming being placed on 20 ± 5 DEG C of envrionment temperatures and 50% ~ 70% ambient relative humidity, natural curing is to specifying the length of time, tests the cohesive strength of potassium magnesium phosphate sand-cement slurry and old concrete with DKZ-5000 electric bending testing machine for cement.
The basic physical parameters of table 1 fine aggregate
Fig. 2 is that potassium magnesium phosphate sand-cement slurry of newly mixing prepared by the present embodiment is starting the aquation temperature variation curve of 1400 minutes.Owing to employing compound retarder, the hydration temperature curve newly mixing potassium magnesium phosphate sand-cement slurry all has two temperature peaks and a resting stage, and initial temperature peak is no more than 40 DEG C, shows that in hydration reaction process, hydration heat divides the two-stage to discharge.
Fig. 3 is the shrinkage strain curve of potassium magnesium phosphate sand-cement slurry in aquation 60d prepared by the present embodiment.Comparatively (shrinkage strains is (30 ~ 50) × 10 with silicate cement mortar ratio
-4), the 60d shrinkage strain (8.97 × 10 of potassium magnesium phosphate cement
-5) reduce a more than order of magnitude.
(the specimen molding demoulding is placed in 50 DEG C of warm water and takes out after maintenance 3h for the strength development of the potassium magnesium phosphate sand-cement slurry that table 2 is prepared for the present embodiment and water curing tenacity residue ratio, part under 20 ± 5 DEG C of envrionment temperatures and 50% ~ 70% ambient relative humidity natural curing to specifying the length of time, part is soaked in the water identical with room temperature after 24h, after soaking the length of time to regulation, 2h takes out in advance, dry surperficial moisture content, dry in the air after 2h and test intensity, itself and natural curing are maintenance residual intensity with the ratio of the test piece intensity in the length of time).
The intensity of table 2 potassium magnesium phosphate sand-cement slurry and water curing tenacity residue ratio
Fig. 4, Fig. 5 are the SEM figure of potassium magnesium phosphate sand-cement slurry hardenite sample prepared by the present embodiment.In figure Fig. 4, natural sand and artificial sand distribution are tending towards even, and potassium magnesium phosphate cement slurry is filled in the middle of aggregate, and defect and hole are all less; Fig. 5 is the interfacial state of artificial sand and surrounding slurry, relatively little in angular artificial sand exposed surface, is combined closely with slurry, and around slurry hardenite defect is less; Fig. 6 is the SEM figure of hardenite prepared by the potassium magnesium phosphate cement based gelling component of the present embodiment, and hydrated product is wherein mainly in unformed shape, and whole section structure is fine and close.
Embodiment two
Step one, gets 64 mass parts dead roasting magnesia powders and 36 mass parts potassium primary phosphates, mixes the potassium magnesium phosphate cement that 7.5 mass parts compound retarder preparations are greater than 0.5 hour time of coagulation outward.Described compound retarder is made up of sodium tetraborate, disodium hydrogen phosphate dodecahydrate and inorganic villaumite, and in compound retarder, each composition quality ratio is followed successively by, sodium tetraborate: disodium hydrogen phosphate dodecahydrate: inorganic villaumite=1:4:3.
Step 2, gets 90 mass parts potassium magnesium phosphate cement, 10 mass parts silicon ashes, mixes 0.3 mass parts ferrous sulfate outward, be mixed to get gelling component.
33 quality are divided common river sand and the mixing of 67 mass parts limestone sands by step 3, and obtain grating reasonably two component fine aggregate, its basic physical parameters sees the above table 1.
This step 3 can be carried out before step 2, also can carry out before step one.
Step 4, gets 40 mass parts gelling components and 60 mass parts fine aggregates, gets the water of 5.6 mass parts outward, make and newly mix potassium magnesium phosphate sand-cement slurry.
Deformation test, the strength test method of the concrete preparation process of newly mixing potassium magnesium phosphate sand-cement slurry and the shaping of test specimen and maintenance, potassium magnesium phosphate sand-cement slurry are identical with embodiment one.Through experiment, the folding strength of gained potassium magnesium phosphate sand-cement slurry under different curing condition, ultimate compression strength, with the adhesive bending strength of old concrete and shrinkage strains in table 3.
The intensity of table 3 potassium magnesium phosphate sand-cement slurry, water stability and shrinkage strain
Embodiment three
Step one, gets 60 mass parts dead roasting magnesia powders and 40 mass parts potassium primary phosphates, mixes 7 mass parts compound retarders outward and is mixed with the potassium magnesium phosphate cement being greater than 0.5 hour time of coagulation.Described compound retarder is made up of sodium tetraborate, disodium hydrogen phosphate dodecahydrate and inorganic villaumite, and in compound retarder, each composition quality ratio is followed successively by, sodium tetraborate: disodium hydrogen phosphate dodecahydrate: inorganic villaumite=1:3:2.
Step 2, gets 90 mass parts potassium magnesium phosphate cement, 10 mass parts silicon ashes, mixes 0.25 mass parts ferrous sulfate outward, be mixed to get gelling component.
50 quality are divided common river sand and the mixing of 50 mass parts limestone sands by step 3, and obtain grating reasonably two component fine aggregate, its basic physical parameters is in table 4.
Step 4, gets 46 mass parts gelling components and 54 mass parts fine aggregates, gets the water of 5.75 mass parts outward, make and newly mix potassium magnesium phosphate sand-cement slurry.
Deformation test, the strength test method of the concrete preparation process of newly mixing potassium magnesium phosphate sand-cement slurry and the shaping of test specimen and maintenance, potassium magnesium phosphate sand-cement slurry are identical with embodiment one.Through experiment, the folding strength of gained potassium magnesium phosphate sand-cement slurry under different curing condition, ultimate compression strength, with the adhesive bending strength of old concrete and shrinkage strains in table 3.
The basic physical parameters of table 4 fine aggregate
The intensity of table 5 potassium magnesium phosphate sand-cement slurry, water stability and shrinkage strain
Certainly, above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to people can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations of doing according to the spirit of main technical schemes of the present invention or modification, all should be encompassed within protection scope of the present invention.
Claims (10)
1. a preparation method for high-performance potassium magnesium phosphate sand-cement slurry, is characterized in that comprising the following steps:
Step one: get dead roasting magnesia powder as alkaline constituent, potassium primary phosphate is as acidic components, and mix compound retarder, be mixed with potassium magnesium phosphate cement, wherein, the mass ratio of described dead roasting magnesia powder, described potassium primary phosphate and described compound retarder is followed successively by 60 ~ 67:33 ~ 40:8 ~ 12;
Step 2: get the gelling component that the obtained potassium magnesium phosphate cement of described step one, silicon ash and ferrous sulfate are mixed with potassium magnesium phosphate sand-cement slurry, wherein, the mass ratio of described potassium magnesium phosphate cement, silicon ash and ferrous sulfate is followed successively by 85 ~ 93:5 ~ 10:0.25 ~ 0.50;
Step 3: get the fine aggregate that common river sand and limestone sand are mixed and made into potassium magnesium phosphate sand-cement slurry, wherein, described common river sand and described limestone sand mass ratio are followed successively by 25 ~ 50:50 ~ 75;
Step 4: the fine aggregate getting gelling component that step 2 obtains, step 3 obtained mixes with water, make potassium magnesium phosphate sand-cement slurry, wherein, the mass ratio of described fine aggregate and gelling component is followed successively by 1.25 ~ 1.5:1, and the quality of water accounts for 0.12 ~ 0.15 of gelling component quality;
In no particular order, the order of described step 3 and step one in no particular order for the order of described step 3 and step 2.
2. the preparation method of high-performance potassium magnesium phosphate sand-cement slurry according to claim 1, it is characterized in that this preparation method also comprises step 5: by the potassium magnesium phosphate cement mortar specimen of forming in 3 ~ 6h demoulding, be placed in the warm water maintenance 3 ~ 24h of 30 ~ 50 DEG C, then under natural air environment maintenance to regulation the length of time.
3. the preparation method of high-performance potassium magnesium phosphate sand-cement slurry according to claim 1, is characterized in that: in described step one, and described compound retarder is made up of sodium tetraborate, disodium hydrogen phosphate dodecahydrate and inorganic villaumite.
4. the preparation method of high-performance potassium magnesium phosphate sand-cement slurry according to claim 1, is characterized in that: massfraction>=90% of MgO in described dead roasting magnesia powder, and the specific surface area of dead roasting magnesia powder is 200 ~ 220m
2/ kg.
5. the preparation method of high-performance potassium magnesium phosphate sand-cement slurry according to claim 1, is characterized in that: in described step one, and described potassium primary phosphate is PHOSPHORIC ACID TECH.GRADE potassium dihydrogen, the main granularity of this potassium primary phosphate be 40/350 ~ 60/245 order/μm.
6. the preparation method of high-performance potassium magnesium phosphate sand-cement slurry according to claim 1, is characterized in that: in described step 2, SiO in described silicon ash
2massfraction>=75%, the specific surface area of described silicon ash is 20000 ~ 28000m
2/ kg.
7. the preparation method of high-performance potassium magnesium phosphate sand-cement slurry according to claim 1, is characterized in that: in described step 2, and described ferrous sulfate is technical grade ferrous sulfate.
8. the preparation method of high-performance potassium magnesium phosphate sand-cement slurry according to claim 1, is characterized in that: in described step 3, and described common river sand is medium sand, and its fineness modulus is 2.3 ~ 3.0.
9. the preparation method of high-performance potassium magnesium phosphate sand-cement slurry according to claim 1, it is characterized in that: in described step 3, described limestone sand screens out the stone flour of below 0.315mm and the coarse particles of more than 5mm by aggregate chips and obtains, and its fineness modulus is 3.4 ~ 4.0.
10. a high-performance potassium magnesium phosphate sand-cement slurry, is characterized in that it adopts the preparation method in claim 1 ~ 9 described in arbitrary claim to make.
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