CN104591570A - Water-resistant magnesium phosphate cement and application thereof - Google Patents
Water-resistant magnesium phosphate cement and application thereof Download PDFInfo
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- CN104591570A CN104591570A CN201410855680.5A CN201410855680A CN104591570A CN 104591570 A CN104591570 A CN 104591570A CN 201410855680 A CN201410855680 A CN 201410855680A CN 104591570 A CN104591570 A CN 104591570A
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- magnesium phosphate
- phosphate cement
- cement
- water tolerance
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 239000004568 cement Substances 0.000 title claims abstract description 108
- 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 73
- 239000004137 magnesium phosphate Substances 0.000 title claims abstract description 73
- 229960002261 magnesium phosphate Drugs 0.000 title claims abstract description 73
- 229910000157 magnesium phosphate Inorganic materials 0.000 title claims abstract description 73
- 235000010994 magnesium phosphates Nutrition 0.000 title claims abstract description 73
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000002893 slag Substances 0.000 claims abstract description 35
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 32
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 14
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 14
- 239000010452 phosphate Substances 0.000 claims abstract description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000011777 magnesium Substances 0.000 claims abstract description 7
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 150000003016 phosphoric acids Chemical class 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 17
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 12
- 239000011591 potassium Substances 0.000 claims description 12
- 229910052700 potassium Inorganic materials 0.000 claims description 12
- 239000002689 soil Substances 0.000 claims description 11
- 229910021538 borax Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000004328 sodium tetraborate Substances 0.000 claims description 8
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 229910001385 heavy metal Inorganic materials 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- 238000003837 high-temperature calcination Methods 0.000 claims description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 3
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000004327 boric acid Substances 0.000 claims description 2
- 125000005619 boric acid group Chemical group 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000011109 contamination Methods 0.000 claims description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 2
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- -1 wherein Chemical compound 0.000 claims description 2
- 230000002349 favourable effect Effects 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 230000035699 permeability Effects 0.000 abstract 1
- 239000011574 phosphorus Substances 0.000 abstract 1
- 229910052698 phosphorus Inorganic materials 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 description 24
- 230000006835 compression Effects 0.000 description 21
- 238000007906 compression Methods 0.000 description 21
- 239000000243 solution Substances 0.000 description 20
- 230000003750 conditioning effect Effects 0.000 description 17
- 238000012360 testing method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 235000021050 feed intake Nutrition 0.000 description 4
- 230000001418 larval effect Effects 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 229920002472 Starch Polymers 0.000 description 2
- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 229910052567 struvite Inorganic materials 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 108010063290 Aquaporins Proteins 0.000 description 1
- 108091006146 Channels Proteins 0.000 description 1
- 235000019739 Dicalciumphosphate Nutrition 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000003637 basic solution Substances 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- NEFBYIFKOOEVPA-UHFFFAOYSA-K dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 description 1
- 229940038472 dicalcium phosphate Drugs 0.000 description 1
- 229910000390 dicalcium phosphate Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides water-resistant magnesium phosphate cement, which comprises the following components: the magnesium oxide, the phosphate and the slag are roasted, wherein the mass ratio of magnesium element in the roasted magnesium oxide to phosphorus element in the phosphate is 4-5: 1, the mass content of the slag is 10-30% based on the total mass of the magnesium phosphate cement; the slag is the residue of iron ore after mineral processing or smelting; the water-resistant magnesium phosphate cement can quickly improve the early strength of the cement, maintain the long-term strength, reduce the permeability, improve the water resistance and create favorable conditions for improving the durability of the magnesium phosphate cement.
Description
(1) technical field
The present invention relates to a kind of magnesium phosphate cement of water tolerance, especially a kind of early-strength type cement and application thereof that can ensure its intensity in water surrounding.
(2) background technology
Water tolerance magnesium phosphate cement is that one can along with the length of time gains in strength in water, the guaranteed material of long durability.Existing magnesium phosphate cement (MPC) is compared with ordinary Portland cement, have that cryogenic temperature condensation is fast, cohesive strength is high, drying shrinkage is little, wear resistance and the advantage such as frost resistance is good, find simultaneously, under water supports condition or under wet environment, magnesium phosphate cement strength development slowly even there occurs strength retraction to a certain degree, volume stability obviously reduces, and it serves to show that its water tolerance is also poor, is difficult to meet extra large work or Hydraulic Engineering diversified demand etc. day by day.If be in humidity or rainfall more regions, will certainly have an impact to its weather resistance, this have impact on its widespread use to a certain extent.As can be seen here, be necessary to provide a kind of water tolerance magnesium phosphate cement, self early strength can be improved fast, can longterm strength be maintained again, reduce perviousness, also can improve water tolerance, for the weather resistance improving magnesium phosphate cement creates favorable conditions.
On the other hand, in the oceanographic engineering such as desilting and harbour is newly-built, enlarging of navigation channel, water transferring canal, usually enrich moisture and a large amount of dredging silts can be produced under the environment of humidity, and use existing ordinary Portland cement process mud, the sludge treatment time can be made long because curing sludge early strength is low, thus storage mud field, a large amount of land need be set.Therefore, be necessary to provide a kind of water tolerance magnesium phosphate cement, the early strength of curing sludge can be improved, thus shorten treatment time and the floor space of mud.
(3) summary of the invention
The object of this invention is to provide a kind of water tolerance magnesium phosphate cement, to make the longterm strength of cement own be guaranteed, perviousness is low, and in water, loss of strength is few, and water tolerance improves.
For achieving the above object, the present invention adopts following technical scheme:
A kind of water tolerance magnesium phosphate cement, described water tolerance magnesium phosphate cement comprises following component: dead burned magnesia, phosphoric acid salt, slag, wherein, magnesium elements in described dead burned magnesia is 4 ~ 5:1 with the ratio of the amount of substance of the phosphoric in phosphoric acid salt, the mass content of described slag is 10% ~ 30% based on the total mass of magnesium phosphate cement (MagnesiumPhosphate Cement, MPC); Described slag is the residue of iron ore after ore dressing or smelting, and containing a large amount of vitreum and a small amount of crystal in slag, contained vitreum and the dominant of crystal are quartz (SiO mutually
2), Dicalcium Phosphate (Feed Grade) (C
2and Calucium Silicate powder (CS) etc. S).
Further, the component of water tolerance magnesium phosphate cement of the present invention also comprises retardant, and the mass content of described retardant is 5% ~ 10% of dead burned magnesia quality.
Preferably, water tolerance magnesium phosphate cement of the present invention is made up of following component: dead burned magnesia, phosphoric acid salt, slag, retardant, wherein, magnesium elements in described dead burned magnesia is 4 ~ 5:1 with the ratio of the amount of substance of the phosphoric in phosphoric acid salt, the mass content of described slag is 10% ~ 30% based on the total mass of magnesium phosphate cement (MPC), and the mass content of described retardant is 5% ~ 10% of dead burned magnesia quality.
Dead burned magnesia of the present invention is formed through 1500 ~ 1700 DEG C of high-temperature calcinations by Magnesium Carbonate Light 41-45, and order number is 100 ~ 200, and purity is 92 ~ 96%, and specific surface area is 2200 ~ 3800cm
2/ g.
Slag of the present invention is through grinding 1 ~ 3h, and specific surface area is 3600 ~ 4500cm
2/ g.
Preferably described phosphoric acid salt is the compound of one or more arbitrary proportions in potassium primary phosphate, primary ammonium phosphate, Secondary ammonium phosphate, dipotassium hydrogen phosphate.
Preferably described retardant is boric acid or borax, or the mixture of both arbitrary proportions.
Water tolerance magnesium phosphate cement of the present invention can be used for the soil processing heavy metal contamination, described application method is: each component of described water tolerance magnesium phosphate cement mixed, add water and stir formation sand-cement slurry, gained sand-cement slurry is sprayed in contaminated soil and the objectionable impuritiess such as heavy metal are wherein cured; Described water add 10% ~ 18% (when this scope, cement evenly, fully can react with water mix the water yield, and makes cement effectively play its early powerful feature and water tolerance) that quality is water tolerance magnesium phosphate cement total mass; Mix that quality is contaminated soil quality 15% ~ 20% of described water tolerance magnesium phosphate cement.
Water tolerance magnesium phosphate cement of the present invention is applied in training of channel mud, its intensity can be improved fast, thus dredging silt soil can be made for Other Engineering, decrease its occupation of land time.Embody rule method is identical with the above-mentioned method being applied to contaminated soil.
Water tolerance magnesium phosphate cement of the present invention also can be used for original place Ground Treatment soil, reclaiming land around sea, the Rapid-Repair of road, bridge, airfield runway, oceanographic engineering and military repairing.During application, described water tolerance magnesium phosphate cement is added water and is prepared into sand-cement slurry, sand-cement slurry is sprayed directly on ground, mud is cured process to it, the preparation method of described sand-cement slurry is: each component of water tolerance magnesium phosphate cement mixed, add water to stir and namely form sand-cement slurry, add that quality is water tolerance magnesium phosphate cement total mass 10% ~ 18% of described water.
Below the principle of technical solution of the present invention is explained.
Technical scheme of the present invention, key problems-solving is needed to be: after dead burned magnesia mixes with phosphoric acid salt, add a certain amount of water, can constantly there is acid-base neutralisation reaction, produce hydrated product, the gel particles that this hydrated product is formed is the intensity source of cement itself, the intergranular hole of filling concrete simultaneously.If phosphoric acid salt is for potassium primary phosphate, then the main hydration products that both reactions produce is K type struvite (MgKPO
46H
2o), but this hydrated product is under chance water or wet environment, and first the phosphoric acid salt on magnesium phosphate cement slurry surface be dissoluted, and forms sour environment in the solution, and then cause MgKPO
46H
2o (MKP) crystal and gel section are dissolved, hole and crackle is formed on slurry surface and inside, cause structural compactness decline, porosity increase, the hydrated product that cementation is played in magnesium oxide particle surface and gap reduces gradually, short texture, thus cause magnesium phosphate cement strength retraction.
Technical scheme of the present invention, why can improve the water tolerance of magnesium phosphate cement, prevent the retraction of cement self later strength and the reduction of volume stability, due on the basis of original magnesium phosphate cement, a certain amount of slag powders of admixture, be conducive to suppressing phosphoric acid salt stripping, prevent cement from occurring a large amount of holes, relatively can improve the intensity of sand-cement slurry.And the pH value of the admixture of slag to MPC conditioning solutions improves, under making cement remain on basic solution environment, and the admixture of slag also has certain effect for suppressing the dissolving of MKP, a large amount of MKP karyogenesis can be ensured, thus be conducive to the intensity of MPC in water and have certain guarantee, can not decline too much.By analyzing SEM collection of illustrative plates, later stage finds that soil body hole reduces, structure is comparatively fine and close, significantly improves the intensity of cement self.
In described cement, when phosphoric acid salt is for potassium primary phosphate, when magnesium elements in described dead burned magnesia is 4 ~ 5:1 with the ratio of the amount of substance of the phosphoric in phosphoric acid salt, be converted into after quality through amount of substance, the weight ratio scope of dead burned magnesia and potassium primary phosphate is 1.18 ~ 1.47.When quality 1.18 ~ 1.47 is than scope, can ensure fully to react between the two, MPC only starches intensity and obtains maximum value.The mass content of described slag is 10% ~ 30% based on the total mass of magnesium phosphate cement (MPC), and when fine slag contents is less than 10%, slag is on the low side, and the water-proofing performance of magnesium phosphate cement can not get embodying; When being greater than 30%, the intensity of cement reduces on the contrary, and water tolerance is deteriorated gradually.
Technical scheme of the present invention, after admixture slag, reduce phosphatic content in MPC, make pH value of solution have adjustability, simultaneously slag refinement cement pore structure, effectively fills minute aperture, reduce porosity, decrease K type struvite at the precipitation of cement surface and recrystallization, thus enhance its water tolerance, for the weather resistance improving magnesium phosphate cement creates favorable conditions.
The component of water tolerance magnesium phosphate cement of the present invention can also comprise retardant, and the content of described retardant is that 5% ~ 10% of dead burned magnesia quality is advisable.Add the hydration reaction time that retardant can increase cement, increase construction operation time, cement component is fully mixed.But retardant has certain influence to the early stage growing amount of magnesium phosphate cement hydrated product and weave construction, and retardant is larger to magnesium oxide massfraction, affect larger.Therefore, retardant add-on is 5% ~ 10% of dead burned magnesia weight, is preferably scope.
Water tolerance magnesium phosphate cement of the present invention, can improve self early strength fast, can maintain longterm strength again, reduce perviousness, improve water tolerance simultaneously, for the weather resistance improving magnesium phosphate cement creates favourable condition.
(4) embodiment
Further illustrate the present invention below by specific embodiment, but protection scope of the present invention is not limited in this.
Embodiment starting material used are:
The slag selected is from Hangzhou Construction Materials Co., Ltd., and grinding lh, specific surface area is about 4650cm
2/ g.
Dead burned magnesia: for Magnesium Carbonate Light 41-45 forms through 1700 DEG C of high-temperature calcinations.Wherein, the order number of described dead burned magnesia is 200, and purity is 95.72%, and specific surface area is about 2540cm
2/ g.
Phosphoric acid salt: adopt potassium primary phosphate, technical grade, analytical pure, content is about 99.5%, white powder crystallization, soluble in water.
Retardant: adopt borax, analytical pure AR.
Embodiment 1
The charging capacity of table 1 embodiment 1 water tolerance magnesium phosphate cement
| Material | Dead burned magnesia | Potassium primary phosphate | Borax | Slag | Water |
| Feed intake quality (g) | 246.23 | 208.67 | 12.31 | 51.91 | 83.06 |
Fill a prescription by table 1 and prepare water tolerance magnesium phosphate cement sample: the mass values of dead burned magnesia and potassium primary phosphate is 1.18, namely the magnesium elements in dead burned magnesia is 4 with the ratio of the amount of substance of the phosphoric in potassium primary phosphate, borax content is 5% of dead burned magnesia quality, slag content is 10% of magnesium phosphate cement (MPC) total mass, and four mix;
Add water stirring, and the interpolation quality of described water is 16% of magnesium phosphate cement (MPC) total mass, stirs, obtains sand-cement slurry;
Then sand-cement slurry is poured in agitator, after stirring, only starch standard GB/T1346-2001, GB/T8077-2000 with reference to ordinary Portland cement, namely shaping test piece obtains water tolerance magnesium phosphate cement sample after being of a size of 40mm × 40mm × 160mm, lh demoulding.
Respectively in air at room temperature ((20 ± 2) DEG C, relative humidity less than 70%) in and water in maintenance (maintenance in water-filled maintaining box, (20 ± 2) DEG C) to specifying the length of time (being respectively 1d, 3d, 7d, 28d), on WE-60 type hydraulic universal testing machine, measure the ultimate compression strength of sample respectively, and measure the folding strength of sample different larval instar with STDKZ-5000 type electric bending testing machine for cement.
The ultimate compression strength measuring maintenance in the air of its 1d and water is respectively 37.86MPa, 35.56MPa, and folding strength is respectively 6.42MPa, 5.52MPa, and conditioning solutions pH value is 7.53; The ultimate compression strength measuring maintenance in the air of its 3d and water is respectively 44.17MPa, 41.67MPa, and folding strength is respectively 6.94MPa, 6.16MPa, and conditioning solutions pH value is 7.95; The ultimate compression strength measuring maintenance in the air of its 7d and water is respectively 48.54MPa, 42.29MPa, and folding strength is respectively 7.64MPa, 7.15MPa, and conditioning solutions pH value is 8.40; The ultimate compression strength measuring maintenance in the air of its 28d and water is respectively 51.98MPa, 45.63MPa, and folding strength is respectively 8.87MPa, 8.02MPa, and conditioning solutions pH value is 8.95.
Embodiment 2
The charging capacity of table 2 embodiment 2 water tolerance magnesium phosphate cement
| Material | Dead burned magnesia | Potassium primary phosphate | Borax | Slag | Water |
| Feed intake quality (g) | 218.87 | 185.49 | 10.94 | 103.82 | 83.06 |
On the basis of embodiment 1, only slag content is adjusted to 20% of magnesium phosphate cement (MPC) total mass.
Respectively in air at room temperature ((20 ± 2) DEG C, relative humidity less than 70%) in and water in maintenance (maintenance in water-filled maintaining box, (20 ± 2) DEG C) to specifying the length of time (being respectively 1d, 3d, 7d, 28d), on WE-60 type hydraulic universal testing machine, measure the ultimate compression strength of sample respectively, and measure the folding strength of sample different larval instar with STDKZ-5000 type electric bending testing machine for cement.
The ultimate compression strength measuring maintenance in the air of its 1d and water is respectively 36.85MPa, 33.58MPa, and folding strength is respectively 6.13MPa, 4.82MPa, and conditioning solutions pH value is 7.48; The ultimate compression strength measuring maintenance in the air of its 3d and water is respectively 43.13MPa, 36.46MPa, and folding strength is respectively 6.21MPa, 5.16MPa, and conditioning solutions pH value is 7.85; The ultimate compression strength measuring maintenance in the air of its 7d and water is respectively 44.38MPa, 38.02MPa, and folding strength is respectively 5.86MPa, 5.35MPa, and conditioning solutions pH value is 8.21; The ultimate compression strength measuring maintenance in the air of its 28d and water is respectively 49.27MPa, 39.06MPa, and folding strength is respectively 6.41MPa, 5.80MPa, and conditioning solutions pH value is 8.95.
Embodiment 3
The charging capacity of table 3 embodiment 3 water tolerance magnesium phosphate cement
| Material | Dead burned magnesia | Potassium primary phosphate | Borax | Slag | Water |
| Feed intake quality (g) | 191.51 | 162.30 | 9.58 | 155.74 | 83.06 |
On the basis of embodiment 1, only slag content is adjusted to 30% of magnesium phosphate cement (MPC) total mass.
Respectively in air at room temperature ((20 ± 2) DEG C, relative humidity less than 70%) in and water in maintenance (maintenance in water-filled maintaining box, (20 ± 2) DEG C) to specifying the length of time (being respectively 1d, 3d, 7d, 28d), on WE-60 type hydraulic universal testing machine, measure the ultimate compression strength of sample respectively, and measure the folding strength of sample different larval instar with STDKZ-5000 type electric bending testing machine for cement.
The ultimate compression strength measuring maintenance in the air of its 1d and water is respectively 24.53MPa, 21.68MPa, and folding strength is respectively 3.23MPa, 2.68MPa, and conditioning solutions pH value is 7.45; The ultimate compression strength measuring maintenance in the air of its 3d and water is respectively 26.88MPa, 24.48MPa, and folding strength is respectively 3.51MPa, 3.14MPa, and conditioning solutions pH value is 7.56; The ultimate compression strength measuring maintenance in the air of its 7d and water is respectively 30.73MPa, 25.52MPa, and folding strength is respectively 3.87MPa, 3.32MPa, and conditioning solutions pH value is 7.79; The ultimate compression strength measuring maintenance in the air of its 28d and water is respectively 32.71MPa, 25.73MPa, and folding strength is respectively 4.14MPa, 3.43MPa, and conditioning solutions pH value is 8.17.
Comparative example
The charging capacity of table 4 comparative example magnesium phosphate cement
| Material | Dead burned magnesia | Potassium primary phosphate | Borax | Slag | Water |
| Feed intake quality (g) | 273.59 | 231.86 | 13.68 | 0.00 | 83.06 |
In the situation that other conditions are all identical, on the basis of embodiment 1, only slag content is adjusted to 0% of magnesium phosphate cement (MPC) total mass, does not namely mix slag.
Respectively in air at room temperature ((20 ± 2) DEG C, relative humidity less than 70%) in and water in maintenance (maintenance in water-filled maintaining box, (20 ± 2) DEG C) to specifying the length of time (being respectively 1d, 3d, 7d, 28d), on WE-60 type hydraulic universal testing machine, measure the ultimate compression strength of sample respectively, and measure the folding strength of sample different larval instar with STDKZ-5000 type electric bending testing machine for cement.
The ultimate compression strength measuring maintenance in the air of its 1d and water is respectively 33.67MPa, 35.50MPa, and folding strength is respectively 5.76MPa, 4.72MPa, and conditioning solutions pH value is 7.47; The ultimate compression strength measuring maintenance in the air of its 3d and water is respectively 39.27MPa, 36.88MPa, and folding strength is respectively 6.09MPa, 5.26MPa, and conditioning solutions pH value is 7.66; The ultimate compression strength measuring maintenance in the air of its 7d and water is respectively 41.67MPa, 34.88MPa, and folding strength is respectively 6.53MPa, 5.8MPa, and conditioning solutions pH value is 7.76; The ultimate compression strength measuring maintenance in the air of its 28d and water is respectively 45.83MPa, 32.71MPa, and folding strength is respectively 7.11MPa, 6.17MPa, and conditioning solutions pH value is 8.40.
Compared with comparative example, strong Be very effective morning of water tolerance magnesium phosphate cement of the present invention, when fine slag contents is 10%, water tolerance strengthens, water is supported ultimate compression strength and folding strength under condition and is improved nearly 30%, 40% respectively, and can prevent MPC from supporting a small amount of unreacted phosphoric acid salt stripping in condition lower substrate at water, improve the pH value environment of the aqueous solution, cause main hydration products MgKPO
46H
2o not facile hydrolysis under alkaline environment, system porosity is reduced, and strength retraction is controlled.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (10)
1. a water tolerance magnesium phosphate cement, it is characterized in that, described water tolerance magnesium phosphate cement comprises following component: dead burned magnesia, phosphoric acid salt, slag, wherein, magnesium elements in described dead burned magnesia is 4 ~ 5:1 with the ratio of the amount of substance of the phosphoric in phosphoric acid salt, and the mass content of described slag is 10% ~ 30% based on the total mass of magnesium phosphate cement; Described slag is that iron ore is through ore dressing or the residue after smelting.
2. water tolerance magnesium phosphate cement as claimed in claim 1, it is characterized in that, the component of described water tolerance magnesium phosphate cement also comprises retardant, and the mass content of described retardant is 5% ~ 10% of dead burned magnesia quality.
3. water tolerance magnesium phosphate cement as claimed in claim 2, it is characterized in that, described water tolerance magnesium phosphate cement is made up of following component: dead burned magnesia, phosphoric acid salt, slag, retardant, wherein, magnesium elements in described dead burned magnesia is 4 ~ 5:1 with the ratio of the amount of substance of the phosphoric in phosphoric acid salt, the mass content of described slag is 10% ~ 30% based on the total mass of magnesium phosphate cement, and the mass content of described retardant is 5% ~ 10% of dead burned magnesia quality.
4. the water tolerance magnesium phosphate cement as described in one of claims 1 to 3, it is characterized in that, described dead burned magnesia is formed through 1500 ~ 1700 DEG C of high-temperature calcinations by Magnesium Carbonate Light 41-45, and order number is 100 ~ 200, purity is 92 ~ 96%, and specific surface area is 2200 ~ 3800cm
2/ g.
5. the water tolerance magnesium phosphate cement as described in one of claims 1 to 3, is characterized in that, described slag is through grinding 1 ~ 3h, and specific surface area is 3600 ~ 4500cm
2/ g.
6. the water tolerance magnesium phosphate cement as described in one of claims 1 to 3, is characterized in that, described phosphoric acid salt is the compound of one or more arbitrary proportions in potassium primary phosphate, primary ammonium phosphate, Secondary ammonium phosphate, dipotassium hydrogen phosphate.
7. the water tolerance magnesium phosphate cement as described in one of claims 1 to 3, is characterized in that, described retardant is boric acid or borax, or the mixture of both arbitrary proportions.
8. the application of the water tolerance magnesium phosphate cement as described in one of claims 1 to 3 in the soil of process heavy metal contamination, it is characterized in that, described application method is: each component of described water tolerance magnesium phosphate cement mixed, add water and stir formation sand-cement slurry, gained sand-cement slurry is sprayed in contaminated soil and the objectionable impuritiess such as heavy metal are wherein cured; Add that quality is water tolerance magnesium phosphate cement total mass 10% ~ 18% of described water; Mix that quality is contaminated soil quality 15% ~ 20% of described water tolerance magnesium phosphate cement.
9. the water tolerance magnesium phosphate cement as described in one of claims 1 to 3 is at original place Ground Treatment soil, and dredging silt solidifies, reclaiming land around sea, the Rapid-Repair of road, bridge, airfield runway, the application in oceanographic engineering and military repairing.
10. apply as claimed in claim 9, it is characterized in that, during application, described water tolerance magnesium phosphate cement is added water and is prepared into sand-cement slurry, sand-cement slurry is sprayed directly on ground, mud is cured process to it, the preparation method of described sand-cement slurry is: each component of water tolerance magnesium phosphate cement mixed, add water to stir and namely form sand-cement slurry, add that quality is water tolerance magnesium phosphate cement total mass 10% ~ 18% of described water.
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| CN105800979A (en) * | 2016-03-14 | 2016-07-27 | 同济大学 | Magnesium phosphate cement with good hydrolytic resistance and using method thereof |
| CN106587683A (en) * | 2016-11-18 | 2017-04-26 | 中国矿业大学 | Method for improving water resistance of magnesium phosphate cement base |
| CN106630924A (en) * | 2016-12-14 | 2017-05-10 | 河海大学 | Ferronickel slag magnesium phosphate binding material and application thereof |
| CN106892641A (en) * | 2015-12-18 | 2017-06-27 | 天津拓展伟创材料研究有限公司 | Cement and preparation method thereof for preparing high-speed rail plate |
| CN107162451A (en) * | 2017-07-21 | 2017-09-15 | 福州大学 | A kind of enhanced water resistance magnesium phosphate cement without retarder |
| CN107226629A (en) * | 2017-06-28 | 2017-10-03 | 常州市万昌化工有限公司 | A kind of water-resistant type magnesium phosphate cement sill and preparation method thereof |
| CN107352880A (en) * | 2017-08-31 | 2017-11-17 | 李朋国 | A kind of curing agent for administering heavy metal pollution |
| CN107445502A (en) * | 2017-09-13 | 2017-12-08 | 贵州开磷磷石膏综合利用有限公司 | A kind of water resistance calcium phosphate Si-Mg cement and its processing method |
| CN107601932A (en) * | 2017-09-13 | 2018-01-19 | 贵州开磷磷石膏综合利用有限公司 | A kind of calcium phosphate Si-Mg cement and its processing method |
| CN108249795A (en) * | 2018-02-02 | 2018-07-06 | 重庆大学 | A kind of magnesium phosphate cement |
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| CN108610089A (en) * | 2018-06-25 | 2018-10-02 | 宿迁德威新材料有限公司 | It is a kind of can fast demoulding assembling thermal-insulating wall board material and preparation method thereof |
| CN108911542A (en) * | 2018-07-13 | 2018-11-30 | 中国人民武装警察部队后勤学院 | Mixed with the rescue and relief work phosphate cement of CMA biomass ash |
| CN109095849A (en) * | 2018-08-24 | 2018-12-28 | 山东高速路用新材料技术有限公司 | Low alkaline cementitious material of a kind of high fertile for concrete for plant growth and preparation method thereof |
| CN109776006A (en) * | 2019-03-15 | 2019-05-21 | 中电投工程研究检测评定中心有限公司 | A kind of magnesium phosphate cement and concrete |
| CN110451832A (en) * | 2019-08-08 | 2019-11-15 | 广州市泰宇科技发展有限公司 | A kind of phosphorus magnesium anchor adhesive and preparation method thereof |
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| CN115818993A (en) * | 2022-11-07 | 2023-03-21 | 江苏科技大学 | Water-resistant magnesium phosphate cement and preparation method thereof |
| CN115849857A (en) * | 2022-11-09 | 2023-03-28 | 同济大学 | Soil curing agent for foundation construction of island-reef sea area, preparation method thereof and soil curing method |
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| CN106587683A (en) * | 2016-11-18 | 2017-04-26 | 中国矿业大学 | Method for improving water resistance of magnesium phosphate cement base |
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| CN113165030B (en) * | 2018-12-18 | 2023-09-19 | 欧安诺核退役公司 | Method for conditioning acid waste by cementing |
| CN109776006A (en) * | 2019-03-15 | 2019-05-21 | 中电投工程研究检测评定中心有限公司 | A kind of magnesium phosphate cement and concrete |
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| WO2022083382A1 (en) * | 2020-10-19 | 2022-04-28 | 常州工学院 | Magnesium phosphate cement-based double-liquid grouting material and preparation method therefor |
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| CN115818993A (en) * | 2022-11-07 | 2023-03-21 | 江苏科技大学 | Water-resistant magnesium phosphate cement and preparation method thereof |
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