CN112456906A - Application of silicon carbide whiskers in preparation of wear-resistant toughened anti-crack cement-based material - Google Patents
Application of silicon carbide whiskers in preparation of wear-resistant toughened anti-crack cement-based material Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 96
- 239000000463 material Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims description 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical class [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title description 5
- 239000006185 dispersion Substances 0.000 claims abstract description 36
- 238000005336 cracking Methods 0.000 claims abstract description 32
- 239000004567 concrete Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 238000003760 magnetic stirring Methods 0.000 claims abstract description 5
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 3
- 239000008030 superplasticizer Substances 0.000 claims abstract description 3
- 239000011083 cement mortar Substances 0.000 claims description 32
- 239000011398 Portland cement Substances 0.000 claims description 16
- 239000004576 sand Substances 0.000 claims description 13
- 239000004575 stone Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 4
- 239000005457 ice water Substances 0.000 claims description 2
- 239000006072 paste Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 description 16
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 12
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 12
- 238000001035 drying Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 230000005764 inhibitory process Effects 0.000 description 9
- 238000003776 cleavage reaction Methods 0.000 description 8
- 230000007017 scission Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 239000000835 fiber Substances 0.000 description 7
- 238000010998 test method Methods 0.000 description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 239000011259 mixed solution Substances 0.000 description 6
- 230000000243 photosynthetic effect Effects 0.000 description 6
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 239000011787 zinc oxide Substances 0.000 description 6
- 230000033228 biological regulation Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 229920005594 polymer fiber Polymers 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 238000007655 standard test method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/383—Whiskers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention provides an application of SiCw in preparing wear-resistant toughened anti-cracking cement-based materials, which comprises the following steps: mixing SiCw, water and a polycarboxylate superplasticizer, uniformly stirring, and then sequentially performing ultrasonic dispersion and magnetic stirring dispersion to obtain a SiCw dispersion liquid; adding the SiCw dispersion liquid into a cement mixture to prepare a SiCw wear-resistant toughened anti-cracking cement-based material; according to the invention, SiCw is doped into the cement-based material, so that the wear resistance, toughness and crack resistance of the cement-based material are obviously improved, and the high cost required by structure detection and external repair of a concrete structure due to shrinkage deformation and cracking can be reduced; the wear resistance of the cement-based material is obviously enhanced, and the wear of the cement concrete pavement is reduced.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to an application of silicon carbide whiskers in preparation of a wear-resistant toughened anti-cracking cement-based material.
Background
The traditional cement has the defects of high hydration heat, large drying shrinkage, poor crack resistance and poor durability. Therefore, the traditional cement-based materials have poor toughness and low tensile strength because ofThis often presents the problem of easy fracture and microcrack spalling, resulting in poor durability, safety and functionality of the concrete structure and short life cycle. In order to improve the dry shrinkage cracking phenomenon of concrete structures and improve the strength and bending toughness of cement-based materials, it is a common practice to add steel fibers, carbon fibers, polymer fibers, glass fibers and calcium sulfate whiskers (CaSO) into cement-based materials4w) Calcium carbonate whiskers (CaCO)3w) Zinc oxide whisker (ZnO)w) And the like to prepare the high-strength high-toughness cement-based material. The steel fibers, the carbon fibers and the polymer fibers can obviously improve the mechanical property of the cement-based material, but the fibers are often too concentrated and filled in mortar among coarse aggregates, so that the interface bonding of the fibers and a matrix is influenced, and the strength of the cement-based material is not favorably enhanced; the glass fiber has high elastic modulus and crisp property, and the ready-mixed cement is easy to break when quickly collecting the mixed fiber, but reduces the improvement effect on the cement-based material with the cement performance index. Calcium sulfate whisker (CaSO)4w) The mechanical properties of the upgraded cement-based materials are limited and both crack resistance and durability are still under investigation. Calcium carbonate whisker (CaCO)3w) The calcium carbonate whisker and the cement mortar matrix are mainly applied to oil well cement, but the interface bonding strength between the calcium carbonate whisker and the cement mortar matrix is too high to be beneficial to enhancing the crack deflection mechanism of the calcium carbonate whisker and possibly degrading the reinforcing and toughening effects on the cement mortar composite material. Zinc oxide whisker (ZnO)w) The electromagnetic wave transmission capability of the cement-based composite material can be improved, but the improvement on the mechanical property and the crack resistance of the cement-based material is limited.
The silicon carbide crystal whisker (Sinet SiC Whiskers, SiCw) is a short fiber single crystal material with high orientation and the diameter of nano-scale to micron-scale, the diameter is 0.1-1.0 μm, the length is 10-50 μm, the length-diameter ratio is more than 20, the bending strength can reach 10GPa, and the elastic modulus can reach more than 480 GPa. The performance parameters of several commonly used whiskers are shown in table 1, compared to fibers and calcium sulfate whiskers (CaSO)4w) Calcium carbonate whiskers (CaCO)3w) Zinc oxide whisker (ZnO)w) The SiCw has extremely high strength, hardness, elastic modulus and chemical stability, and can obviously improve the toughness, strength, hardness, wear resistance, high temperature resistance, radiation resistance, thermal conductivity and heat resistance of the composite materialThermal shock performance.
TABLE 1 Property parameters of several commonly used whiskers
The proper amount of SiCw is added into the cement-based material, so that the toughness and the crack resistance of the cement-based material can be obviously improved, the high cost required by structure detection and external repair of a concrete structure due to shrinkage deformation and cracking can be reduced, the operation and maintenance cost of the building structure is saved, and the safety and the durability of the building structure are effectively improved; meanwhile, SiCw has higher tensile strength, elastic modulus and Mohs hardness, can obviously enhance the wear resistance of the cement-based material, reduce the wear of the cement concrete pavement and improve the durability of the cement concrete pavement.
Disclosure of Invention
The invention provides an application of SiCw in preparing wear-resistant toughened anti-cracking cement-based materials by doping a proper amount of SiCw in ordinary cement to enhance the wear resistance, toughness and anti-cracking performance of the cement-based materials.
The technical scheme of the invention is as follows:
the application of SiCw in preparing wear-resistant toughened anti-crack cement-based materials comprises the following steps:
mixing SiCw, water and a polycarboxylate superplasticizer, uniformly stirring, and then sequentially performing ultrasonic dispersion and magnetic stirring dispersion to obtain a SiCw dispersion liquid; adding the SiCw dispersion liquid into a cement mixture to prepare a SiCw wear-resistant toughened anti-cracking cement-based material;
preferred conditions for ultrasonic dispersion are: dispersing in an ice water bath, wherein the dispersing power is 50-70 w, the dispersing time is 10-30 min, and the limiting temperature is 5-40 ℃;
the preferred conditions for magnetic stirring dispersion are: the rotating speed is 600-1000 rpm, the power is 40w, and the stirring time is 10-20 min;
the mass ratio of the SiCw, the water, the polycarboxylic acid water reducing agent and the cement in the cement mixture is 0.05-1%: 0.25% -0.60%: 0.10% -0.50%: 1;
the cement is general portland cement in GB175-2007 general portland cement;
the cement mixture is cement paste, cement mortar or cement concrete; specifically, the cement mixture is preferably one of the following:
(1) P.O 42.5 grade ordinary portland cement and water in a mass ratio of 1: 0.25-0.40 of a mixture;
(2) P.O 42.5-grade ordinary portland cement, fly ash, sand, stone and water in a mass ratio of 1: 0.35-0.45: 1.40-1.60: 3.40-3.50: 0.50-0.65 of a mixture;
(3) P.II 52.5 cement, water and sand mass ratio is 1: 0.3-0.5: 2-3 of a mixture;
the sand is medium sand with good gradation; the stone is well graded pebbles or broken stones.
The invention has the beneficial effects that: according to the invention, SiCw is doped into the cement-based material, so that the wear resistance, toughness and crack resistance of the cement-based material are obviously improved, and the high cost required by structure detection and external repair of a concrete structure due to shrinkage deformation and cracking can be reduced; the wear resistance of the cement-based material is obviously enhanced, and the wear of the cement concrete pavement is reduced. The prepared SiCw wear-resistant toughened anti-cracking cement-based material has the advantages that the wear resistance is improved by about 40%, the breaking strength is improved by about 20.7%, the splitting tensile strength is improved by about 50%, the drying shrinkage inhibition rate is about 25%, the self-shrinkage inhibition rate is about 20%, and the crack inhibition rate is about 17.4%.
Drawings
Fig. 1 is an SEM image of SiCw.
Fig. 2 is an SEM image of SiCw after dispersion.
FIG. 3 shows the result of the measurement of the abrasion resistance of SiCw abrasion resistant toughened anti-crack cement mortar.
FIG. 4 shows the results of the SiCw abrasion-resistant, toughened and anti-cracking cement mortar split tensile strength test.
FIG. 5 is an SEM image of SiCw abrasion resistant toughened anti-crack cement mortar 28 d.
Detailed Description
The invention is further illustrated by the following examples, without restricting its scope.
SiCw used in the following examples was purchased from chemical Limited of Waverrucke, Beijing.
Example 1
(1) And dispersing SiCw. Adding 0.90g SiCw into a beaker, adding 300g tap water and 1.8g LonS-P type polycarboxylic acid high-performance water reducing agent (purchased from Jilong chemical building materials Co., Ltd.) into the beaker, stirring by using a glass rod, and then performing ultrasonic ice-bath dispersion on the mixed solution (an ultrasonic dispersion instrument is purchased from Hunan leading edge science and technology Co., Ltd., FS-750T type), wherein the dispersion power is 50w, the dispersion time is 10min, and the limiting temperature is 35 ℃; after ultrasonic dispersion, the mixture is dispersed again by a heat collection type magnetic stirrer (the magnetic stirrer is purchased from Hunan leading edge science and technology Limited company, and the model is photosynthetic DF-101S), the rotating speed is 600 r/min, the power is 40w, and the stirring time is 20 min.
(2) And (3) preparing SiCw wear-resistant toughened anti-cracking cement. When preparing the cement-based material, mixing SiCw: the SiCw wear-resistant toughened anti-cracking cement can be prepared by adding 0.05% of general portland cement by mass ratio.
(3) The SiCw dispersion and P.I 42.5-grade portland Cement are prepared into Cement Paste according to the Method for testing the water consumption, setting time and stability of the Standard consistency of Cement by the mass ratio of 0.30 and GB/T1346-2011, and drying shrinkage and self-shrinkage tests are respectively carried out according to the Method for testing the drying shrinkage and cracking performance of Cement Mortar and concrete by GB/T29417-2012 and the corrugated pipe Method recorded in specifications of ASTM C1698-2009, Standard Test Method for automatically generating Cement and Cement Paste of center Paste and Mortar, wherein the drying shrinkage inhibition rate of the Cement Paste reaches 22.6%, and the self-shrinkage inhibition rate reaches 19.4%.
Example 2
(1) And dispersing SiCw. Adding 540g of tap water and 2.5g of LonS-P type polycarboxylic acid high-performance water reducing agent (purchased from Jilong chemical building materials Co., Ltd.) into a beaker, stirring by using a glass rod, and performing ultrasonic ice-bath dispersion on the mixed solution (an ultrasonic dispersion instrument is purchased from Hunan leading edge science and technology Co., Ltd., FS-750T type), wherein the dispersion power is 60w, the dispersion time is 20min, and the limiting temperature is 40 ℃; after ultrasonic dispersion, the mixture is dispersed again by a heat collection type magnetic stirrer (the magnetic stirrer is purchased from Hunan leading edge science and technology Limited company, and the model is photosynthetic DF-101S), the rotating speed is 800 r/min, the power is 40w, and the stirring time is 15 min.
(2) And (3) preparing SiCw wear-resistant toughened anti-cracking cement. When preparing the cement-based material, mixing SiCw: the SiCw wear-resistant toughened anti-cracking cement can be prepared by adding 0.50% of general portland cement by mass ratio.
(3) Mixing the SiCw dispersion liquid with P.II 52.5 cement according to the mass ratio of 0.5:1:3, preparing cement mortar according to GB/T17671-1999 Strength test method (ISO method), and measuring the breaking strength of the cement mortar, wherein the breaking strength of the cement mortar is 6.9MPa in 28 days, the breaking strength of the SiCw wear-resistant toughened anti-cracking cement mortar is 8.3MPa, and the breaking strength of the cement mortar is improved by 20%. The cement mortar is tested for the cleavage tensile strength according to GB/T29417-2012 test method for the drying shrinkage cracking performance of the cement mortar and concrete, the cleavage tensile strength of the cement mortar is 11.4MPa in 7 days, the cleavage tensile strength of the SiCw wear-resistant toughened anti-cracking cement mortar is 15.0MPa, and the cleavage tensile strength of the cement mortar is increased by 31.6%. The cement mortar is tested for abrasion resistance according to GB/T16925-1997 abrasion resistance test methods (ball bearing method) for concrete and products thereof and JTG E30-2005 test regulations for road engineering cement and cement concrete, and the abrasion resistance of the cement mortar is improved by 49.6%.
Example 3
(1) And dispersing SiCw. Adding 10g of SiCw into a beaker, adding 600g of tap water and 8g of LonS-P type polycarboxylic acid high-performance water reducing agent (purchased from Jilong chemical building materials Co., Ltd.) into the beaker, stirring the mixture by using a glass rod, and then performing ultrasonic ice-bath dispersion on the mixed solution (an ultrasonic dispersion instrument is purchased from Hunan leading edge science and technology Co., Ltd., FS-750T type), wherein the dispersion power is 70w, the dispersion time is 30min, and the limiting temperature is 40 ℃; after ultrasonic dispersion, the mixture is dispersed again by a heat collection type magnetic stirrer (the magnetic stirrer is purchased from Hunan leading edge science and technology Limited company, and the model is photosynthetic DF-101S), the rotating speed is 1000 r/min, the power is 40w, and the stirring time is 18 min.
(2) And (3) preparing SiCw wear-resistant toughened anti-cracking cement. When preparing the cement-based material, mixing SiCw: the general silicate cement is added according to the mass ratio of 1 percent, and the SiCw wear-resistant toughened anti-cracking cement can be prepared.
(3) According to JGJ55-2011 'design rule for mixing proportion of common concrete', the SiCw dispersion liquid is mixed with P.O 42.5 grade common Portland cement: fly ash: sand: stone: the water is mixed according to the mixing ratio of 1:0.45:1.40:3.40:0.65 to prepare the concrete, and the crack inhibition rate reaches 16.3%; the sand is medium sand with good gradation; the stones are well graded pebbles or broken stones. The abrasion value is tested according to JTG E30-2005 Highway engineering cement and cement concrete test regulation, and the 28-day concrete abrasion value is 2.28kg/m2The abrasion value of the SiCw wear-resistant toughened anti-crack concrete is 3.02kg/m2The wear resistance of the cement mortar is improved by 32.5 percent.
Example 4
(1) And dispersing SiCw. Adding 400g of tap water and 2.5g of LonS-P type polycarboxylic acid high-performance water reducing agent (purchased from Jilong chemical building materials Co., Ltd.) into a beaker by taking 3g of SiCw, stirring by using a glass rod, and then performing ultrasonic ice-bath dispersion on the mixed solution (an ultrasonic dispersion instrument is purchased from Hunan leading edge science and technology Co., Ltd., FS-750T type), wherein the dispersion power is 60w, the dispersion time is 20min, and the limiting temperature is 38 ℃; after ultrasonic dispersion, the mixture is dispersed again by a heat collection type magnetic stirrer (the magnetic stirrer is purchased from Hunan leading edge science and technology Limited company, and the model is photosynthetic DF-101S), the rotating speed is 800 r/min, the power is 40w, and the stirring time is 15 min.
(2) And (3) preparing SiCw wear-resistant toughened anti-cracking cement. When preparing the cement-based material, mixing SiCw: the SiCw wear-resistant toughened anti-cracking cement can be prepared by adding 0.20 mass percent of general portland cement.
(3) The SiCw dispersion and P.I 42.5-grade portland Cement are prepared into Cement Paste according to the mass ratio of 0.25 and GB/T1346-2011 'Method for testing water consumption, setting time and stability of Standard consistency of Cement', and drying shrinkage and self-shrinkage tests are respectively carried out according to GB/T29417-2012 'Test Method for drying shrinkage and cracking performance of Cement Mortar and concrete' and ASTM C1698-2009, Standard Test Method for Autogenic series Cement of Cement Paste and Mortar specifications, wherein the inhibition rate of drying shrinkage of the Cement Paste reaches 30.5%, and the inhibition rate of self-shrinkage reaches 23.6%.
Example 5
(1) And dispersing SiCw. Putting 6g SiCw into a beaker, adding 540g tap water and 3g LonS-P type polycarboxylic acid high-performance water reducing agent (purchased from Jilong chemical building materials Co., Ltd.) into the beaker, stirring the mixture by using a glass rod, and then performing ultrasonic ice-bath dispersion on the mixed solution (an ultrasonic dispersion instrument is purchased from Hunan leading edge science and technology Co., Ltd., FS-750T type), wherein the dispersion power is 50w, the dispersion time is 30min, and the limiting temperature is 40 ℃; after ultrasonic dispersion, the mixture is dispersed again by a heat collection type magnetic stirrer (the magnetic stirrer is purchased from Hunan leading edge science and technology Limited company, and the model is photosynthetic DF-101S), the rotating speed is 900 r/min, the power is 40w, and the stirring time is 18 min.
(2) And (3) preparing SiCw wear-resistant toughened anti-cracking cement. When preparing the cement-based material, mixing SiCw: the SiCw wear-resistant toughened anti-cracking cement can be prepared by adding 0.40 mass percent of general portland cement.
(3) The SiCw dispersion and P.II 52.5 cement are mixed according to the sand mass ratio of 0.4:1:2.5, and cement mortar is prepared according to GB/T17671-1999 Strength test method (ISO method). The cement mortar is tested for the cleavage tensile strength according to GB/T29417-2012 test method for the drying shrinkage cracking performance of the cement mortar and concrete, the cleavage tensile strength of the cement mortar is 16.3MPa in 120 days, the cleavage tensile strength of the SiCw wear-resistant toughened anti-cracking cement mortar is 24.0MPa, and the cleavage tensile strength of the cement mortar is improved by 47.2%. The abrasion resistance of the cement mortar is tested according to GB/T16925-1997 abrasion resistance test methods (ball bearing method) for concrete and products thereof and JTG E30-2005 test regulations for road engineering cement and cement concrete, and the abrasion resistance of the cement mortar is improved by 40.6%.
Example 6
(1) And dispersing SiCw. Adding 18.0g of SiCw into a beaker, adding 600g of tap water and 10g of LonS-P type polycarboxylic acid high-performance water reducing agent (purchased from Jilong chemical building materials Co., Ltd.) into the beaker, stirring by using a glass rod, and then performing ultrasonic ice-bath dispersion on the mixed solution (an ultrasonic dispersion instrument is purchased from Hunan leading edge science and technology Co., Ltd., FS-750T type), wherein the dispersion power is 60w, the dispersion time is 30min, and the limiting temperature is 35 ℃; after ultrasonic dispersion, the mixture is dispersed again by a heat collection type magnetic stirrer (the magnetic stirrer is purchased from Hunan leading edge science and technology Limited company, and the model is photosynthetic DF-101S), the rotating speed is 1000 r/min, the power is 40w, and the stirring time is 20 min.
(2) And (3) preparing SiCw wear-resistant toughened anti-cracking cement. When preparing the cement-based material, mixing SiCw: the general silicate cement is added according to the mass ratio of 0.8 percent, and the SiCw wear-resistant toughened anti-cracking cement can be prepared.
(3) According to JGJ55-2011 'design rule for mixing proportion of common concrete', the SiCw dispersion liquid is mixed with P.O 42.5 grade common Portland cement: fly ash: sand: stone: the water is mixed according to the mixing ratio of 1:0.30:1.50:3.50:0.60 to prepare the concrete, and the crack inhibition rate reaches 20.7%; the sand is medium sand with good gradation; the stones are well graded pebbles or broken stones. The abrasion value is tested according to JTG E30-2005 Highway engineering cement and cement concrete test regulation, and the 28-day concrete abrasion value is 2.59kg/m2The abrasion value of the SiCw wear-resistant toughened anti-crack concrete is 3.76kg/m2And the wear resistance of the cement mortar is improved by 45.2 percent.
Claims (5)
- The application of SiCw in preparing wear-resistant, toughened and anti-crack cement-based materials is characterized in that the application method comprises the following steps:mixing SiCw, water and a polycarboxylate superplasticizer, uniformly stirring, and then sequentially performing ultrasonic dispersion and magnetic stirring dispersion to obtain a SiCw dispersion liquid; adding the SiCw dispersion liquid into a cement mixture to prepare a SiCw wear-resistant toughened anti-cracking cement-based material;the mass ratio of the SiCw, the water, the polycarboxylic acid water reducing agent and the cement in the cement mixture is 0.05-1%: 0.25% -0.60%: 0.10% -0.50%: 1;the cement mixture is cement paste, cement mortar or cement concrete.
- 2. The use of SiCw in the preparation of a wear resistant toughened crack resistant cementitious material according to claim 1 wherein the ultrasonic dispersion conditions are: dispersing in ice water bath, wherein the dispersing power is 50-70 w, the dispersing time is 10-30 min, and the limiting temperature is 5-40 ℃.
- 3. The use of SiCw in the preparation of a wear resistant toughened crack resistant cementitious material according to claim 1 wherein the magnetic stirring dispersion conditions are: the rotating speed is 600-1000 rpm, the power is 40w, and the stirring time is 10-20 min.
- 4. The use of SiCw in the preparation of a wear resistant toughened crack resistant cementitious material according to claim 1 wherein the cement is a universal portland cement of GB175-2007 universal portland cement.
- 5. Use of SiCw in the preparation of a wear resistant toughened crack resistant cementitious material according to claim 1 wherein the cementitious mixture is selected from one of the following:(1) P.O 42.5 grade ordinary portland cement and water in a mass ratio of 1: 0.25-0.40 of a mixture;(2) P.O 42.5-grade ordinary portland cement, fly ash, sand, stone and water in a mass ratio of 1: 0.35-0.45: 1.40-1.60: 3.40-3.50: 0.50-0.65 of a mixture;(3) P.II 52.5 cement, water and sand mass ratio is 1: 0.3-0.5: 2-3.
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