CN114656180A - Cementing material containing clay mineral and application thereof - Google Patents
Cementing material containing clay mineral and application thereof Download PDFInfo
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- CN114656180A CN114656180A CN202210412437.0A CN202210412437A CN114656180A CN 114656180 A CN114656180 A CN 114656180A CN 202210412437 A CN202210412437 A CN 202210412437A CN 114656180 A CN114656180 A CN 114656180A
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- clay minerals
- clay mineral
- cementing material
- clay
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- 239000002734 clay mineral Substances 0.000 title claims abstract description 97
- 239000000463 material Substances 0.000 title claims abstract description 72
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 41
- 239000010440 gypsum Substances 0.000 claims abstract description 41
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 30
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 30
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 30
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052622 kaolinite Inorganic materials 0.000 claims abstract description 20
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052900 illite Inorganic materials 0.000 claims abstract description 18
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 239000003638 chemical reducing agent Substances 0.000 claims description 33
- 239000004568 cement Substances 0.000 claims description 19
- 239000000292 calcium oxide Substances 0.000 claims description 15
- 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
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 9
- 229910052681 coesite Inorganic materials 0.000 claims description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052682 stishovite Inorganic materials 0.000 claims description 6
- 229910052905 tridymite Inorganic materials 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 3
- 229910021647 smectite Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 42
- 239000004567 concrete Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 15
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 11
- 229910052901 montmorillonite Inorganic materials 0.000 description 10
- 239000002245 particle Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 239000011083 cement mortar Substances 0.000 description 3
- 229910001919 chlorite Inorganic materials 0.000 description 3
- 229910052619 chlorite group Inorganic materials 0.000 description 3
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical class [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001917 fluorescence detection Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002366 mineral element Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229910052615 phyllosilicate Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/28—Mixtures thereof with other inorganic cementitious materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
- C04B11/264—Gypsum from the desulfurisation of flue gases
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a clay mineral-containing cementing material, which comprises the following components in parts by weight: 77-87 parts of clay mineral, 5-11 parts of gypsum and 5-12 parts of calcium hydroxide; the clay minerals include kaolinite clay minerals, montmorillonite clay minerals and illite clay minerals. The clay mineral-containing cementing material provided by the invention can utilize a large amount of clay minerals, and the kaolinite clay minerals and the montmorillonite clay minerals can show compressive strength (the 28-day strength is more than or equal to 1MPa) which meets the use value, so that the utilization rate of the clay minerals is improved.
Description
Technical Field
The invention belongs to the technical field of concrete materials, and particularly relates to a clay mineral-containing cementing material and application thereof.
Background
The clay mineral is a phyllosilicate mineral with the particle size of less than 2 mu m, is one of main components of soil, has the type and content which can greatly affect the performance of the soil, needs to use sand as aggregate in the manufacturing process of concrete and filling materials, and the sand aggregate is adhered with the clay mineral during the forming or excavating and crushing process, and can adversely affect the performance of the concrete and filling materials in the concrete and filling materials. As the content of kaolinite, montmorillonite and illite in the clay mineral increases, the compressive strength of the concrete and filling material decreases significantly, the shrinkage of the concrete and filling material increases, and the electric flux and elastic modulus of the concrete and filling material are affected.
The mainstream solution at this stage is to use sand aggregate with low clay content or treat it to reduce the clay content, but this increases the construction cost and wastes resources. Therefore, how to utilize the clay minerals reasonably is a difficult problem in waste recovery. Meanwhile, with the continuous rising of the cement price, the proportion of the filling cost of enterprises to the mining cost is continuously increased. Therefore, finding a filling cement suitable for replacing cement to reduce the cost of filling mining becomes one of the important research directions of filling mining.
Disclosure of Invention
In view of the above, the present invention provides a clay mineral-containing cementitious material and an application thereof, which can utilize a large amount of clay minerals to improve the utilization rate of the clay minerals.
The invention provides a clay mineral-containing cementing material which comprises the following components in parts by weight: 77-87 parts of clay mineral, 5-11 parts of gypsum and 5-12 parts of calcium hydroxide; the clay minerals include kaolinite clay minerals, montmorillonite clay minerals and illite clay minerals.
Preferably, the water-gel ratio of the cementing material is 0.25-0.5.
Preferably, the water reducing agent is 0-0.5% of the weight of the cementing material.
Preferably, the kaolinite clay mineral comprises the following components in parts by weight: in parts by weight, SiO253-58 parts of Al2O338-40 parts, K2O2-3 parts, Fe2O30.2-0.5 part of MgO, 0.1-0.3 part of CaO, 0.1-0.2 part of Na20 to 0.2 portion of O and P2O50.1 to 0.3 portion.
Preferably, the montmorillonite clay mineral comprises the following components in parts by weight: SiO 2265-70 parts of Al2O315-20 parts, K2O1-2 parts, Fe2O32-3 parts of MgO 4-5 parts, CaO 4-5 parts, Na20-0.1 part of O.
Preferably, the illite clay mineral comprises the following components in parts by weight: SiO 2270-75 parts of Al2O315-19 parts, K25-7 parts of O, Fe2O31-2 parts of MgO, 0.2-0.4 part of CaO, 0.1-0.2 part of Na2And 1-1.5 parts of O.
Preferably, the gypsum is desulfurized gypsum and comprises the following components in parts by weight: CaO 45-50 parts, SiO22-7 parts of Al2O30-1 part of MgO, 0-1.5 parts of SO338-48 parts of Cl and 0-1 part of Cl.
The invention provides the use of a cementitious material as defined in any one of the preceding claims in the preparation of a cementitious material.
Compared with the prior art, the invention has the advantages and positive effects that:
firstly, compared with the existing cementing material, the cementing material containing clay minerals provided by the invention has high clay mineral occupation ratio, fully improves the utilization rate of the clay minerals, and reasonably solves the problem of clay mineral stockpiling.
And secondly, compared with the existing cement clinker or the existing cementing material containing solid waste base, the cementing material disclosed by the invention is simpler in composition, consists of three components, namely clay mineral, calcium hydroxide and desulfurized gypsum, and is not added with cement clinker and slag, so that the raw material cost is greatly reduced.
Moreover, the composition is simplified and simultaneously can still show good cementing property and rheological property due to the exertion of synergistic action, including compressive strength and fluidity. The cement paste test block is prepared from the cementing material according to GB17671-1999 cement mortar strength test method with a water-cement ratio of 0.25-0.5, the test block size is 30mm multiplied by 50mm, and the cement paste test block is maintained at a temperature of 20 ℃ and a humidity of more than 99.5 percent, so that the cement paste test block shows good compressive strength.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a clay mineral-containing cementing material, which comprises the following components in parts by weight: 77-87 parts of clay mineral, 5-11 parts of gypsum and 5-12 parts of calcium hydroxide; the clay minerals include kaolinite clay minerals, montmorillonite clay minerals and illite clay minerals.
The clay mineral-containing cementitious material provided by the invention comprises a clay mineral. The weight portion of the modified phenolic resin is 77-87 portions, preferably 83 portions. In the present invention, the clay minerals include kaolinite clay minerals, montmorillonite clay minerals and illite clay minerals.
In the present invention, the kaolinite clay mineral preferably comprises the following components in parts by weight: in parts by weight, SiO253-58 parts of Al2O338-40 parts, K2O2-3 parts, Fe2O30.2-0.5 part of MgO, 0.1-0.3 part of CaO, 0.1-0.2 part of Na20 to 0.2 portion of O and P2O50.1 to 0.3 portion.
In the invention, the particle size of the kaolinite is preferably more than 200 meshes, and more preferably 250-300 meshes. According to the invention, the hydration difficulty can be reduced on the one hand by limiting the particle size of the kaolinite, and the uniformity of the material can be improved on the other hand.
In the present invention, the smectite clay mineral preferably includes the following components in parts by weight: SiO 2265-70 parts of Al2O315-20 parts, K2O1-2 parts, Fe2O32-3 parts of MgO 4-5 parts of CaO 4-5 parts of Na20-0.1 part of O.
In the present invention, the particle size of the montmorillonite is preferably 1200 mesh or more, and more preferably 1250 to 1300 mesh. According to the invention, the hydration difficulty can be reduced and the material uniformity can be improved by limiting the granularity of the montmorillonite.
In the present invention, the illite clay mineral preferably includes the following components in parts by weight: SiO 2270-75 parts of Al2O315-19 parts, K25-7 parts of O, Fe2O31-2 parts of MgO, 0.2-0.4 part of CaO, 0.1-0.2 part of Na2And 1-1.5 parts of O.
In the invention, the particle size of the illite is preferably 700 meshes or more, and more preferably 800-1000 meshes. According to the invention, the hydration difficulty can be reduced on one hand and the material uniformity can be improved on the other hand by limiting the particle size of the illite.
The clay mineral-containing cementitious material provided by the invention comprises gypsum. Comprises 5 to 11 parts by weight, preferably 10 parts by weight. In the invention, the gypsum is preferably desulfurized gypsum, and comprises the following components in parts by weight: CaO 45-50 parts, SiO22-7 parts of Al2O30-1 part of MgO, 0-1.5 parts of SO338-48 parts of Cl and 0-1 part of Cl.
The clay mineral-containing cementitious material provided by the invention comprises calcium hydroxide. Comprises 5 to 12 parts by weight, preferably 7 parts by weight. In the present invention, the calcium hydroxide is preferably analytically pure.
The chemical composition of the clay mineral and the desulfurized gypsum according to the present invention refers to the content of various metals or mineral elements in terms of oxides, and does not refer to the content of compounds present in the clay mineral or desulfurized gypsum in terms of oxides. In addition, the above chemical composition results can be obtained by conventional detection methods known in the art, such as typical fluorescence detection after or without loss of ignition. The sources of the clay mineral, calcium hydroxide and gypsum are not particularly limited, and the clay mineral, calcium hydroxide and gypsum can be purchased commercially or manufactured by self.
The clay mineral-containing cementing material provided by the invention preferably further comprises a water reducing agent, wherein the water reducing agent is preferably 0-0.5% of the weight of the cementing material; the water reducing agent is preferably a polycarboxylic acid water reducing agent. The source of the water reducing agent is not particularly limited, and the water reducing agent can be prepared from conventional and commercially available products in the field.
The water-to-gel ratio of the clay mineral-containing cementitious material provided by the present invention is preferably 0.25 to 0.5.
The clay mineral-containing cementing material provided by the invention excites the activity of the clay mineral, so that the clay mineral becomes a useful component in a concrete system, and the effectiveness of the clay mineral is exerted to the maximum.
The invention provides the use of a cementitious material as defined in any one of the preceding claims in the preparation of a cementitious material.
In order to further illustrate the present invention, the following embodiments are described in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
Curing at 25 degrees, and the composition of the cementing material containing clay minerals is as follows:
83g of kaolinite (the granularity is 200 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum, 0.43 of water-to-gel ratio and 0.3g of water reducing agent.
Example 2
Curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
83g of kaolinite (200 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum, 0.43 of water-to-gel ratio and 0.3g of water reducing agent.
Example 3
Curing at 25 degrees, and the composition of the cementing material containing clay minerals is as follows:
83g of montmorillonite (1250 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum, 0.35 of water-gel ratio and 0.3g of water reducing agent.
Example 4
Curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
83g of montmorillonite (1250 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum, 0.35 of water-to-gel ratio and 0.3g of water reducing agent.
Example 5
Curing at 25 degrees, and the composition of the cementing material containing clay minerals is as follows:
83g of illite (the granularity is 800 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum, 0.26 of water-to-gel ratio and 0.3g of water reducing agent.
Example 6
Curing at 55 ℃, wherein the composition of the gelled material containing the clay mineral is as follows:
83g of illite (800 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum, 0.26 of water-to-gel ratio and 0.3g of water reducing agent.
Example 7
The difference from the example 1 is that the concrete composition is as follows without adding water reducing agent:
curing at 25 degrees, and the composition of the cementing material containing clay minerals is as follows:
83g of kaolinite (the granularity is 200 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum and the water-to-gel ratio is 0.43.
Example 8
The difference from the example 2 is that the concrete composition is as follows without adding water reducing agent:
curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
83g of kaolinite (200 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum and 0.43 of water-to-gel ratio.
Example 9
The difference from the example 3 is that the concrete composition is as follows without adding water reducing agent:
curing at 25 degrees, and the composition of the cementing material containing clay minerals is as follows:
83g of montmorillonite (1250 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum and 0.35 of water-to-gel ratio.
Example 10
The difference from the embodiment 4 is that the water reducing agent is not added, and the concrete composition is as follows:
curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
83g of montmorillonite (1250 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum and 0.35 of water-to-gel ratio.
Example 11
The difference from the example 5 is that the water aqua is not added or reduced, and the concrete composition is as follows:
curing at 25 degrees, and the composition of the cementitious material containing clay minerals is as follows:
83g of illite (the granularity is 800 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum and the water-to-gel ratio is 0.26.
Example 12
The difference from the example 6 is that the water aqua is not added or reduced, and the concrete composition is as follows:
curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
83g of illite (800 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum and 0.26 of water-to-gel ratio.
Comparative example 1
The difference from example 2 is that calcium oxide is not added, and the specific composition is as follows:
curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
83g of kaolinite (200 meshes), 7g of desulfurized gypsum, 0.43 of water-cement ratio and 0.3g of water reducing agent.
Comparative example 2
The difference from the example 2 is that the concrete composition is as follows without adding the desulfurized gypsum:
curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
83g of kaolinite (200 meshes), 10g of calcium hydroxide, 0.43 of water-gel ratio and 0.3g of water reducing agent.
Comparative example 3
The difference from example 4 is that calcium oxide is not hydrogenated, and the specific composition is as follows:
curing at 55 ℃, wherein the composition of the gelled material containing the clay mineral is as follows:
83g of montmorillonite (1250 meshes), 7g of desulfurized gypsum, 0.35 of water-cement ratio and 0.3g of water reducing agent.
Comparative example 4
The difference from the example 4 is that the desulfurized gypsum is not added, and the specific composition is as follows:
curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
83g of montmorillonite (1250 meshes), 10g of calcium hydroxide, 0.35 of water-gel ratio and 0.3g of water reducing agent.
Comparative example 5
The difference from example 6 is that calcium oxide is not hydrogenated, and the specific composition is as follows:
curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
83g of illite (800 meshes), 7g of desulfurized gypsum, 0.26 of water-cement ratio and 0.3g of water reducing agent.
Comparative example 6
The difference from the example 6 is that the concrete composition is as follows without adding the desulfurized gypsum:
curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
83g of illite (800 meshes), 10g of calcium hydroxide, 0.26 of water-gel ratio and 0.3g of water reducing agent.
Comparative example 7
Compared with the embodiment 2, the method has the difference that the integral mixing amount of the external composite exciting agent is increased in proportion, and the specific composition is as follows:
curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
66g of kaolinite (200 meshes), 20g of calcium hydroxide, 14g of desulfurized gypsum, 0.43 of water-to-gel ratio and 0.3g of water reducing agent.
Comparative example 8
Compared with the embodiment 4, the difference is that the integral doping amount of the external composite excitant is increased in proportion, and the specific composition is as follows:
curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
66g of montmorillonite (1250 meshes), 20g of calcium hydroxide, 14g of desulfurized gypsum, 0.35 of water-to-gel ratio and 0.3g of water reducing agent.
Comparative example 9
Compared with the embodiment 6, the difference is that the integral doping amount of the external composite excitant is increased in proportion, and the specific composition is as follows:
curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
66g of illite (800 meshes), 20g of calcium hydroxide, 14g of desulfurized gypsum, 0.26 of water-gel ratio and 0.3g of water reducing agent.
Comparative example 10
Curing at 25 degrees, and the composition of the cementing material containing clay minerals is as follows:
83g of chlorite (the granularity is 800 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum, 0.26 of water-to-gel ratio and 0.3g of water reducing agent.
Comparative example 11
Curing at 55 ℃, wherein the composition of the cementing material containing clay minerals is as follows:
83g of chlorite (800 meshes), 10g of calcium hydroxide, 7g of desulfurized gypsum, 0.26 of water-to-gel ratio and 0.3g of water reducing agent.
Performance test
Specific components of the clay mineral and the desulfurized gypsum used in the above examples and comparative examples are shown in Table 1. Water reducing agent purchased from Jintai environmental resources Co., Ltd
TABLE 1 raw material chemistry
The cement materials of examples 1 to 12 and comparative examples 1 to 11 were prepared into neat paste samples according to GB17671-1999 "Cement mortar Strength test method", wherein the size of the sample is 30mm × 30mm × 50mm, and the curing was performed at a temperature of 20 ℃ and a humidity of 99.5% or more. The concrete is cured to different ages after pouring and forming, and the compressive strength is measured according to the compressive strength test method specified in GB/T17671-1999 Cement mortar Strength test method (ISO method). The test results are shown in table 2:
TABLE 2 compression strength of mortar test block
Wherein "-" represents no strength
As can be seen from Table 2, the compressive strength of the cementitious material provided by the invention can be improved, wherein the compressive strength of the cementitious material containing the kaolinite clay mineral and the montmorillonite clay mineral is more than 1MPa in 28 days, the cementitious material has use value (the strength is more than or equal to 1MPa in 28 days), and the compressive strength is enhanced after the water reducing agent is added compared with that before the water reducing agent is added. As can be seen from comparative examples 1 to 9, neither the addition of calcium hydroxide nor the addition of a desulfurized gypsum cementing material has strength, and the strength cannot be improved by excessively increasing the amount of the composite exciting agent. As can be seen from the comparative examples 10 to 11, the compressive strength of the chlorite cannot be increased by the cementing material provided by the invention.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The clay mineral-containing cementing material is characterized by comprising the following components in parts by weight: 77-87 parts of clay mineral, 5-11 parts of gypsum and 5-12 parts of calcium hydroxide; the clay minerals include kaolinite clay minerals, montmorillonite clay minerals and illite clay minerals.
2. Cement according to claim 1, characterised in that the cement has a water-to-gel ratio of 0.25-0.5.
3. The cement material according to claim 1, further comprising a water reducing agent, wherein the water reducing agent is 0-0.5% by weight of the cement material.
4. The cement according to claim 1, wherein the kaolinite clay mineral comprises the following components in parts by weight: in parts by weight, SiO253-58 parts of Al2O338-40 parts, K2O2-3 parts, Fe2O30.2-0.5 part of MgO, 0.1-0.3 part of CaO, 0.1-0.2 part of Na20 to 0.2 portion of O and P2O50.1 to 0.3 portion.
5. Cement according to claim 1, characterised in that the smectite clay mineral comprises the following components in parts by weight: SiO 2265-70 parts of Al2O315-20 parts, K2O1-2 parts, Fe2O32-3 parts of MgO 4-5 parts of CaO 4-5 parts of Na20-0.1 part of O.
6. The cementitious material of claim 1, wherein the illite clay mineral comprises the following components in parts by weight: SiO 2270-75 parts of Al2O315-19 parts, K25-7 parts of O, Fe2O31-2 parts of MgO, 0.2-0.4 part of CaO, 0.1-0.2 part of Na2And 1-1.5 parts of O.
7. The cementing material of claim 1, wherein the gypsum is desulfurized gypsum comprising the following components in parts by weight: CaO 45-50 parts, SiO22-7 parts of Al2O30-1 part of MgO, 0-1.5 parts of SO338-48 parts of Cl and 0-1 part of Cl.
8. Use of a cementitious material according to any one of claims 1 to 7 in the preparation of a cementitious material.
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