CN113788634A - Micro-expansion cement prepared by utilizing sulfur-fixing ash and preparation method of cement - Google Patents
Micro-expansion cement prepared by utilizing sulfur-fixing ash and preparation method of cement Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 239000002893 slag Substances 0.000 claims abstract description 56
- 238000000227 grinding Methods 0.000 claims abstract description 43
- 239000002956 ash Substances 0.000 claims abstract description 40
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000011593 sulfur Substances 0.000 claims abstract description 33
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 33
- 239000007787 solid Substances 0.000 claims abstract description 30
- 239000010881 fly ash Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000002485 combustion reaction Methods 0.000 claims abstract description 3
- 239000000292 calcium oxide Substances 0.000 claims description 26
- 238000010998 test method Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000000843 powder Substances 0.000 claims description 14
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 229910052593 corundum Inorganic materials 0.000 claims description 12
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 12
- 239000000395 magnesium oxide Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 10
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 239000012452 mother liquor Substances 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- 239000000378 calcium silicate Substances 0.000 claims description 3
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 239000011405 expansive cement Substances 0.000 claims 8
- 239000002910 solid waste Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 18
- 239000011083 cement mortar Substances 0.000 description 11
- 239000003795 chemical substances by application Substances 0.000 description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- -1 clinker Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011414 polymer cement Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052934 alunite Inorganic materials 0.000 description 1
- 239000010424 alunite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- KPZTWMNLAFDTGF-UHFFFAOYSA-D trialuminum;potassium;hexahydroxide;disulfate Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O KPZTWMNLAFDTGF-UHFFFAOYSA-D 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- 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
- C04B2103/52—Grinding aids; Additives added during grinding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides micro-expansion cement prepared by utilizing sulfur-fixing ash and slag and a preparation method of the cement, wherein the micro-expansion cement comprises the following raw materials in parts by weight: 20-30% of fluidized bed combustion ash, 20-28% of clinker, 17-40% of slag, 20-25% of fly ash and grinding aid, wherein the addition amount of the grinding aid is less than or equal to 0.5% of the total mass of the materials. The invention prepares the micro-expansion cement with stable performance by adjusting the mixing proportion of the solid sulfur clinker, the slag and the fly ash, and has the characteristics of high strength and small dry shrinkage coefficient. The preparation method of the micro-expansion cement can effectively absorb the solid sulfur ash wastes, is economical and energy-saving, improves the comprehensive utilization of the solid wastes, relieves the pressure of the environment, and accords with the green environmental protection concept.
Description
Technical Field
The invention belongs to the field of materials, and relates to recycling of solid waste, namely sulfur-fixing ash generated by a circulating fluidized bed boiler, in particular to a method for preparing micro-expansion cement by grinding the sulfur-fixing ash, clinker, slag and fly ash which are used as raw materials together with grinding aid.
Background
At present, cement concrete expanding agents mainly comprise sulphoaluminate expanding agents (such as UEA, alunite expanding agents EA-L and the like), calcium oxide expanding agents, magnesium oxide expanding agents, composite expanding agents and the like, and the expanding agents can achieve the effect, but have limited absorption effect on solid wastes and can not relieve the pressure of the solid wastes on the environment.
The present invention relates to a method for producing sulfur-fixing ash slag, and is characterized by that the sulfur-fixing ash slag is produced by using sulfur-fixing agent containing coal and limestone, etc. in the circulating fluidized bed boiler and burning sulfur at 900 deg.C, and the powder collected by dust-removing of flue gas and bottom slag collected by boiler.
Disclosure of Invention
The invention provides micro-expansion cement prepared by utilizing the solid sulfur ash and a preparation method of the cement.
The technical scheme of the invention is that the micro-expansion cement prepared by utilizing the solid sulfur ash comprises the following raw materials by mass: 20-30% of fluidized bed combustion ash, 20-28% of clinker, 17-40% of slag, 20-25% of fly ash and grinding aid, wherein the addition amount of the grinding aid is less than or equal to 0.5% of the total mass of the materials.
Further, SiO in the solid sulfur ash2、Al2O3、Fe2O3The total content of CaO and MgO is more than 90 percent.
Further, the solid sulfur ash comprises solid sulfur slag, solid sulfur slag or a mixture of the solid sulfur slag and the solid sulfur slag, and the ratio of the solid sulfur ash to the solid sulfur slag is preferably more than or equal to 3: 1.
Further, the clinker main component is SiO2、Al2O3、Fe2O3And CaO, in which calcium silicate mineral (CaO. SiO)2) Content is more than or equal to 66 percent, CaO and SiO2The mass ratio is more than or equal to 2.0, the f-CaO is less than or equal to 1.5 percent, the MgO is less than or equal to 5 percent, the ignition loss is less than or equal to 1.5 percent, the insoluble substance is less than or equal to 3 percent, and the SO3Less than or equal to 1.5 percent, and the test method and the inspection rule conform to GB/T21372 + 2008 Portland cement clinker.
Further, the slag is granulated blast furnace slag or slag powder in which SiO is contained2、Al2O3、Fe2O3The total content of CaO and MgO is more than 95%.
Further, the density of the granulated blast furnace slag or slag powder is more than or equal to 2.8g/cm3The activity of the slag powder is more than or equal to 70 percent in 7 days and more than or equal to 95 percent in 28 days, and the slag powder is fluidizedThe dynamic ratio is more than or equal to 95 percent, the water content is less than or equal to 1 percent, and SO3Less than or equal to 3 percent, less than or equal to 0.06 percent of chloride ions, less than or equal to 1 percent of loss on ignition and less than or equal to 3 percent of insoluble substances; the test method and the test rule conform to GB/T18046-2017 granulated blast furnace slag powder for cement, mortar and concrete.
Furthermore, the fineness of the fly ash is 45 mu m and the screen residue is less than or equal to 12 percent, the water requirement ratio is less than or equal to 95 percent, the ignition loss is less than or equal to 5 percent, the water content is less than or equal to 1 percent, and the SO content is less than or equal to 1 percent3≤3%，f-CaO≤1%，SiO2、Al2O3And Fe2O3The total content is more than or equal to 70 percent, and the density is less than or equal to 2.4g/cm3The stability measured by a Rayleigh method is less than or equal to 5 mm; the fly ash test method and the test rule conform to GB/T1596-2017 fly ash for cement and concrete.
Furthermore, the grinding aid is prepared by mixing 38% of grinding aid mother liquor, 15% of sodium hydroxide, 15% of sodium silicate and 32% of water, wherein the grinding aid mother liquor mainly comprises triethanolamine and glycerol. The triethanolamine and the glycerol grinding aid have surface activity, can be dissociated into corresponding ions after water is added into the cement system, can be adsorbed on the surfaces of clinker and solid sulfur ash particles, reduces flocculation structures generated by electric attraction among the particles, and has good water reducing effect.
The invention also relates to a method for preparing the micro-expansion cement, which comprises the following specific steps: weighing all the raw materials according to the proportion, firstly grinding the solid sulfur clinker and the fly ash together, then adding the clinker, the slag and the grinding aid and continuously grinding to obtain the micro-expansion cement. The grinding device can be a single machine or combined grinding device such as a ball mill, a tube mill, a roller press and the like, but is not limited to the 3 types of grinding devices.
Further, after the sulfur-fixing clinker and the fly ash powder are ground, the grinding fineness is 45 mu m and the screen residue is less than or equal to 20 percent; after clinker, slag and grinding aid are added, the fineness of grinding is controlled to be 45 mu m and the screen residue is controlled to be less than or equal to 30 percent.
Furthermore, when the micro-expansion cement is prepared, the dry shrinkage of the cement without the addition of the sulfur-fixing ash is firstly detected, and the expansion rate of the cement is compensated for the dry shrinkage of the cement by controlling the mixing amount of the sulfur-fixing ash. Taking JC/T984-2005 'Polymer Cement waterproof mortar' national industry standard as an example, the shrinkage rate requirement in the polymer cement waterproof mortar is less than 0.15%, and the blending amount of the solid sulfur ash needs to be adjusted to expand the cement and reduce the shrinkage rate of the cement.
The invention has the following beneficial effects:
cracks may occur when the expansion rate of the cement concrete is too large or the shrinkage rate of the cement concrete is too large, and the durability of the cement concrete is reduced. The invention starts from the cement dry shrinkage rate, firstly measures the dry shrinkage rate of the cement mortar without adding the expansion component, adjusts the mixing amount of the solid sulfur ash through the dry shrinkage rate, and counteracts the cement dry shrinkage through the expansion action of adding a proper amount of the solid sulfur ash.
Due to SO in gypsum3The cement expansion agent has the advantages that the content is too high, the expansion effect is good, the change range of the gypsum content is small, the influence on the expansion effect of cement is large, and both the sulfur-fixing ash residue and the gypsum generate the expansion effect.
The invention utilizes the expansion characteristic of the sulfur-fixing clinker to prepare the micro-expansion cement, and can achieve good expansion effect by operating according to the standard JC/T313-2009 expansion cement expansion rate test method. The invention adopts the ash slag of solid sulfur as the expansion component, the difficulty lies in that the ash slag of solid sulfur has irregular structure, is loose and porous, the water consumption of standard consistency is larger as the expansion cement, the water consumption is increased sharply when used in the project, the invention breaks the loose and porous structure of part of the ash slag of solid sulfur through the independent grinding of the fly ash and the ash slag of solid sulfur, in addition, the glass microballoon in the fly ash can enter the gap structure of the ash slag of solid sulfur, the water consumption of standard consistency is reduced through the above two modes.
The compression strength of the prepared micro-expansion cement is higher than 40MPa in 28 days according to the operation of GB/T17671-2020 Cement mortar Strength test method (ISO method).
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
In the following examples, SiO in the clinker was used221.37% of Al, 63.13% of CaO2O3Content 5.84%, Fe2O34.83% of the total weight of the alloy, 3.03% of MgO, 1.21% of f-CaO, 1.07% of loss on ignition and SO3Content of 0.25%, wherein calcium silicate mineral content is 84.5%, CaO and SiO2The mass ratio is 2.95.
The sulfur-fixing ash in the used sulfur-fixing ash accounts for 73.6 percent; the sulfur-fixing slag accounts for 26.4 percent.
SiO in sulfur fixation ash236.24% of Al2O319.31% of Fe2O314.20 percent of CaO, 17.65 percent of CaO, 5.34 percent of MgO and the balance of K2O、TiO2、SO3And the like. SiO in sulfur-fixing slag235.43% of Al2O318.43% of Fe2O315.30 percent of CaO, 16.85 percent of CaO, 5.03 percent of MgO, and the balance of K2O、TiO2、SO3。
The slag is granulated blast furnace mineral powder, wherein SiO is adopted235.37% Al2O316.48% of Fe2O32.20 percent of CaO, 39.65 percent of CaO, 3.92 percent of MgO, and the balance of MnO and TiO2、SO3And the like. Density 3.09g/cm3Fluidity ratio of 97.05%, water content of 0.33%, and SO30.24 percent of the total content, 0.02 percent of chloride ion content, 0.08 percent of loss on ignition and 0.7 percent of insoluble substance.
10 percent of fly ash fineness of 45 mu m and sieve residue, 93 percent of water requirement, 3.48 percent of ignition loss, 0.1 percent of water content and SO31.23% of the total amount of F-CaO, 0.35% of the total amount of F-CaO, SiO2、Al2O3And Fe2O3The total content is 91 percent, and the density is 2.21g/cm3The stability of the product is 2mm by a Rayleigh method.
Example one
After 20% of clinker, 35% of slag, 20% of solid sulfur ash, 25% of fly ash and 0.5% of grinding aid of the materials are ground according to the method (firstly, the solid sulfur ash and the fly ash are ground together, and then the clinker, the slag and the grinding aid are added for continuous grinding), the expansion rate and the dry shrinkage rate are respectively tested according to the test method of expansion rate of JC/T313-2009 expansion cement and the test method of dry shrinkage of cement mortar according to JC/T603 plus 2004, the water consumption for standard consistency is 153.5ml, the 28 antenna expansion rate can reach 0.15%, the 28 antenna dry shrinkage rate can reach 0.13%, the 28-day compressive strength is 43.7MPa, and the stability (Leeb's method) is 1.8mm, so that the material is good.
Example two
After grinding by the method, expansion rate and dry shrinkage rate tests are respectively operated according to the standard JC/T313-2009 expansion rate test method for expanded cement and JC/T603-2004 dry shrinkage test method for cement mortar, wherein the expansion rate of 28 antenna can reach 0.18%, the dry shrinkage rate of 28 antenna can reach 0.09%, the compressive strength of 28 days is 42.2MPa, and the stability (Rayleigh method) is 2.1mm and is good.
EXAMPLE III
After grinding by the method, expansion rate and dry shrinkage rate tests are respectively operated according to the standard JC/T313-2009 expansion rate test method for expanded cement and JC/T603-2004 dry shrinkage test method for cement mortar, wherein the expansion rate of the standard consistency is 157.5ml, the expansion rate of the 28-antenna property can reach 0.23%, the dry shrinkage rate of the 28-antenna property can reach 0.06%, the compressive strength of the 28-day cement mortar is 41.8MPa, and the stability (Leeb's method) is 2.4mm and is good.
Comparative example 1
Grinding aid with the proportion of 25% of clinker, 25% of slag, 25% of steel slag, 25% of fly ash and 0.5% of the above materials is operated according to the grinding method of the patent (expansion rate and dry shrinkage rate tests are respectively operated according to JC/T313-2009 expansion cement expansion rate test method and JC/T603-containing 2004 cement mortar dry shrinkage test method), the water consumption of standard consistency is 146.5ml, the 28 antenna expansion rate can reach 0.06%, the 28 antenna dry shrinkage rate can reach 0.23%, the 28-day compressive strength is 40.7MPa, the stability (Rayleigh method) is 2.0mm, and the stability is good.
Comparative example 2
25 percent of clinker, 25 percent of slag, 30 percent of solid sulfur ash, 20 percent of steel slag and 0.5 percent of grinding aid of the materials are added into the clinker after the clinker and the steel slag are preferentially ground to meet the standard requirement, and then the clinker and the ground are added, wherein the expansion rate and the dry shrinkage rate are tested according to the standard JC/T313-2009 expansion cement expansion rate test method and JC/T603-plus 2004 cement mortar dry shrinkage test method, the water consumption for the standard consistency is 165.0ml, the 28-antenna expansion rate can reach 0.14 percent, the 28-antenna dry shrinkage rate can reach 0.15 percent, the 28-day compressive strength is 37.8MPa, the stability (Lee's method) is 2.9mm, and the stability is good.
Comparative example three
Grinding aid with the proportion of 25% of clinker, 25% of slag, 30% of solid sulfur ash, 20% of fly ash and 0.5% of the grinding aid is not ground according to the method (all raw materials are directly ground together without grinding the solid sulfur ash and the fly ash to certain fineness), the expansion rate and the dry shrinkage rate are respectively tested according to the standard JC/T313-2009 expansion cement expansion rate test method and JC/T603 Busy 2004 cement mortar dry shrinkage test method, the water consumption of the standard consistency is 163.5ml, the 28 antenna expansion rate can reach 0.22%, the 28 antenna dry shrinkage rate can reach 0.12%, the 28-day compressive strength is 38.9MPa, and the stability (Leeb method) is 3.1mm, so that the cement mortar is good.
Comparative example four
After the clinker aggregate, the slag, the solid sulfur ash and the fly ash are mixed according to the proportion of 25 percent, 30 percent and 20 percent of the fly ash, and no grinding aid is added, after the powder is ground according to the method, the expansion rate and the dry shrinkage rate are respectively operated according to the test method of JC/T313-2009 expansion rate of cement and the test method of JC/T603-Bu 2004 cement mortar dry shrinkage, the water consumption of the standard consistency is 162.0ml, the 28 antenna expansion rate can reach 0.20 percent, the 28 antenna dry shrinkage rate can reach 0.14 percent, the 28-day compressive strength is 38.3MPa, the stability (Lee's method) is 3.4mm, and the stability is good.
Claims (10)
1. The micro-expansion cement prepared from the sulfur-fixing ash is characterized by comprising the following raw materials in mass: 20-30% of fluidized bed combustion ash, 20-28% of clinker, 17-40% of slag, 20-25% of fly ash and grinding aid, wherein the addition amount of the grinding aid is less than or equal to 0.5% of the total mass of the materials.
2. A micro-expansive cement according to claim 1, wherein: SiO in the solid sulfur ash2、Al2O3、Fe2O3The total content of CaO and MgO is more than 90 percent.
3. A micro-expansive cement according to claim 1, wherein: the sulfur-fixing ash slag comprises sulfur-fixing slag, sulfur-fixing slag or a mixture of the sulfur-fixing slag and the sulfur-fixing slag, and the ratio of the sulfur-fixing ash to the sulfur-fixing slag is preferably more than or equal to 3: 1.
4. A micro-expansive cement according to claim 1, wherein: the clinker comprises SiO as the main component2、Al2O3、Fe2O3And CaO, in which calcium silicate mineral (CaO. SiO)2) Content is more than or equal to 66 percent, CaO and SiO2The mass ratio is more than or equal to 2.0, the f-CaO is less than or equal to 1.5 percent, the MgO is less than or equal to 5 percent, the ignition loss is less than or equal to 1.5 percent, the insoluble substance is less than or equal to 3 percent, and the SO3Less than or equal to 1.5 percent, and the test method and the inspection rule conform to GB/T21372 + 2008 Portland cement clinker.
5. A micro-expansive cement according to claim 1, wherein: the slag is granulated blast furnace slag or slag powder of SiO2、Al2O3、Fe2O3The total content of CaO and MgO is more than 95%.
6. The micro-expansive cement according to claim 5, wherein: the density of the granulated blast furnace slag or slag powder is more than or equal to 2.8g/cm3The slag powder fineness is 7 days, the activity is more than or equal to 70 percent, the 28 days activity is more than or equal to 95 percent, the fluidity ratio is more than or equal to 95 percent, the water content is less than or equal to 1 percent, and the SO3Less than or equal to 3 percent, less than or equal to 0.06 percent of chloride ions, less than or equal to 1 percent of loss on ignition and less than or equal to 3 percent of insoluble substances; the test method and the test rule conform to GB/T18046-2017 granulated blast furnace slag powder for cement, mortar and concrete.
7. A micro-expansive cement according to claim 1, wherein: the fineness of fly ash is 45 mu m, the screen residue is less than or equal to 12 percent, the water demand ratio is less than or equal to 95 percent, the ignition loss is less than or equal to 5 percent, and the water content isAmount of less than or equal to 1%, SO3≤3%，f-CaO≤1%，SiO2、Al2O3And Fe2O3The total content is more than or equal to 70 percent, and the density is less than or equal to 2.4g/cm3The stability measured by a Rayleigh method is less than or equal to 5 mm; the fly ash test method and the test rule conform to GB/T1596-2017 fly ash for cement and concrete.
8. A micro-expansive cement according to claim 1, wherein: the grinding aid is prepared by mixing 38% of grinding aid mother liquor, 15% of sodium hydroxide, 15% of sodium silicate and 32% of water, wherein the grinding aid mother liquor comprises triethanolamine and glycerol.
9. The method for preparing the micro-expansive cement as claimed in any one of claims 1 to 8, which is characterized by comprising the following specific steps: weighing all the raw materials according to the proportion, firstly grinding the solid sulfur clinker and the fly ash together, then adding the clinker, the slag and the grinding aid of which the content is less than or equal to 0.5 percent, and continuously grinding to obtain the micro-expansion cement.
10. The method of claim 9, wherein: after the sulfur fixation clinker and the fly ash powder are ground, the grinding fineness is 45 mu m and the screen residue is less than or equal to 20 percent; after clinker, slag and grinding aid are added, the fineness of grinding is controlled to be 45 mu m and the screen residue is controlled to be less than or equal to 30 percent.
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Application publication date: 20211214 |