CN114988813A - Anti-crack concrete for shield segment and preparation method thereof - Google Patents
Anti-crack concrete for shield segment and preparation method thereof Download PDFInfo
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- CN114988813A CN114988813A CN202210745340.1A CN202210745340A CN114988813A CN 114988813 A CN114988813 A CN 114988813A CN 202210745340 A CN202210745340 A CN 202210745340A CN 114988813 A CN114988813 A CN 114988813A
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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
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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
- 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
- C04B14/46—Rock wool ; Ceramic or silicate fibres
- C04B14/4643—Silicates other than zircon
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses anti-cracking concrete for shield segments and a preparation method thereof, belonging to the field of high-performance concrete, and the concrete comprises the following ingredients in parts by weight: 450 parts of Portland cement 430-; the strength of the shield segment made of the concrete is improved, the anti-cracking capability of the shield segment is high, and the anti-cracking performance of the shield segment is guaranteed while the bearing capacity of the tunnel lining structure is improved.
Description
Technical Field
The invention belongs to the field of high-performance concrete, and particularly relates to anti-crack concrete for shield segments and a preparation method thereof.
Background
The shield segment is the main component of the tunnel lining structure, but because the occurrence conditions of rock and soil where the shield tunnel is located are complex, various diseases gradually appear along with the increase of service life, and the main manifestations are that segment concrete cracks to cause water leakage, bolt and reinforcing steel bar corrosion, pipe diameter convergence deformation and the like. The damage and the crack of the duct piece can cause the integral damage of the whole lining structure, which is a great challenge to the control of engineering safety quality indexes. If a concrete with high crack resistance is developed for the shield segment, the durability of the structure can be enhanced, and meanwhile, a plurality of uncontrollable diseases can be avoided.
The conventional fiber concrete for the shield segment mainly comprises steel fiber concrete, polypropylene fiber concrete and carbon fiber concrete, but the defects of high self weight, easy precipitation, easy corrosion and the like of the steel fiber concrete cannot be overcome at present, and the durability of the shield segment is reduced due to the defects; the polypropylene fiber concrete has low strength and poor easiness and is not suitable for cracking resistance; the carbon fiber concrete has high cost, poor dispersibility and high porosity due to easy agglomeration. Therefore, it is necessary to develop an anti-crack concrete with good dispersibility, corrosion resistance, high strength and high cost performance for the shield segment to improve the overall durability and bearing performance of the lining structure.
Disclosure of Invention
The invention provides anti-cracking concrete for a shield segment and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anti-crack concrete for shield segments, comprising by weight: 450 parts of cement 430-.
In the components, the water reducing agent is a polycarboxylic acid high-performance water reducing agent and is a compound product of a carboxylic acid graft multipolymer and other effective auxiliary agents;
the diameter of the dipped structure type basalt fiber is 1mm, the length is 25-30mm, and the density is 2.0g/cm 2 ；
The dipping structure type basalt fiber is prepared by the steps of carrying out high-temperature 1500 ℃ hot melting on pure natural volcanic rock (containing basalt) ores, then moving the molten volcanic rock ore into a tank furnace machine, adding an impregnating compound into the tank furnace machine to soak unformed basalt, then placing the unformed basalt fiber into a wire drawing machine to carry out pultrusion to obtain basalt fiber precursor, and finally twisting and forming the precursor;
the fineness grade of the cement is 376 (m) 2 /kg), the ignition loss is 4%, the sulfur trioxide content is 3%, the alkali content is 0.5%, the initial setting time is 50-60min, the final setting time is 500-600min, the 28d compressive strength is more than or equal to 42.5MPa, and the 28d flexural strength is more than or equal to 6.5 MPa;
the fineness modulus of the sand is 2.5, and the apparent density is 2900kg/m 3 The loose bulk density is 1400kg/m 3 The content of sludge (by mass) was 1.0%, the content of clod (by mass) was 0.4%, the water content of sand was 0.00%, and the contents of sulfide and sulfate (by SO) 3 Mass) of 0.38%, the content of chloride (by mass of Cl ions) of 0.01%, the void ratio of 37% and the alkali-aggregate reaction (expansion ratio) of 0.06%;
the crushed stone is crushed stone with 5-25mm grade number, and the apparent density of the crushed stone is 2950kg/m 3 The loose bulk density was 1626kg/m 3 The content of sludge or dust (by mass) was 0.6%, the content of clod (by mass) was 0.00%, and the content of needle-like particles (by mass)Measured in terms of quantity) of 3.8 percent, the organic matter content is qualified, the quality loss of the firmness index is 0.33 percent, the void ratio is 24 percent, the water absorption is 1 percent, the alkali-aggregate reaction (expansion rate) is 1 percent, and the compressive strength/concrete strength of the rock is more than or equal to 2 MPa.
A preparation method of anti-crack concrete for shield segments comprises the following steps:
s1: pouring cement, fly ash, sand and the gum dipping structure type basalt fiber into a stirrer for dry mixing for 50-60 s;
s2: pouring crushed stone of 5-25mm grade, water and water reducing agent into a stirrer for wet mixing for 110-120 s
S3: discharging after stirring, putting the concrete into a mold for 24 hours, then demolding and maintaining.
Has the advantages that: the invention provides anti-crack concrete for shield segments and a preparation method thereof, and compared with the prior art, the anti-crack concrete has the following advantages:
1. compared with the concrete commonly used for shield segment, the concrete prepared by the invention has the advantages that the compressive strength, the tensile strength and the bending strength obtained by testing are greatly improved. Thereby improving the bearing capacity of the whole tunnel lining structure;
2. the dipping structure type basalt fiber is different from common basalt fiber and other fibers, has larger diameter, is manufactured by twisting and other special processes, has excellent performance, has the advantages of high strength, strong toughness, good dispersibility and high cost performance, and has better associativity with a concrete matrix. The structural performance of the composite material is far higher than that of common basalt fiber, and the tensile strength and ductility of the segment concrete can be enhanced;
3. the gum dipping structure type basalt fiber participates in the hydration reaction of cement, more gel polymers can be generated in the cement hydration reaction, and the three-dimensional network structure is formed by cooperating with the fiber and the concrete matrix material under the stress, so that an integral body is effectively formed, the compactness of the concrete is improved, the internal hole rate of the concrete is reduced, the early initial cracking phenomenon of the concrete is effectively prevented, and the generation and development of cracks are effectively prevented in the stress process. In addition, because the impregnated basalt fibers participate in hydration reaction, the bonding performance of each basic aggregate and the fibers is increased, the strength of the concrete is improved, the brittleness of the concrete is improved to a certain extent, and the bearing capacity of the whole structure is improved.
4. The polycarboxylic acid high-performance water reducing agent is adopted, so that the mixing amount is low, the water reducing rate is high, the setting time can be advanced by 2 hours, the appearance quality of concrete can be improved due to less air bubbles, the porosity of the concrete is reduced, and the strength of the concrete is improved by about 30%;
5. the fly ash is prepared by a coal-fired advanced process, high-calcium ash is not used, the fly ash is required to be stable in quality and uniform in batching, the carbonization heat is reduced in the stirring process, and the porosity of concrete is reduced, so that the occurrence of stress concentration is reduced.
Detailed Description
The present invention will be described in detail with reference to the following specific examples:
example 1
A preparation method of anti-crack concrete for shield segment comprises the following steps:
s1: 43kg of PII-52.5-grade portland cement, 5kg of fly ash, 54kg of sand and 10kg of impregnated basalt fiber are poured into a stirrer for dry mixing for 53s, and the fiber used for the mixing has the diameter of 1mm and the length of 35mm
S2: 114kg of crushed stone with 5-25mm grade, 12kg of water and 2kg of water reducing agent are poured into a stirrer for wet stirring for 120s
S3: discharging after stirring, putting the concrete into a mold for 24 hours, then demolding, and maintaining.
Example 2
A preparation method of anti-crack concrete for shield segments comprises the following steps:
s1: 43kg of PII-52.5-grade portland cement, 5kg of fly ash, 54kg of sand and 10kg of impregnated structural basalt fiber are poured into a stirrer for dry mixing, the mixing time is 50s, and the fiber diameter used for mixing is 1mm, and the length is 35mm
S2: 114kg of crushed stone with 5-25mm grade, 12kg of water and 2.3kg of water reducing agent are poured into a stirrer for wet mixing for 113s
S3: discharging after stirring, putting the concrete into a mold for 24 hours, then demolding and maintaining.
Example 3
A preparation method of anti-crack concrete for shield segments comprises the following steps:
s1: 45kg of PII-52.5 level portland cement, 5.8kg of fly ash, 56kg of sand and 10kg of impregnated structural basalt fiber are poured into a stirrer for dry mixing, the mixing time is 51s, the fiber diameter used for the mixing is 1mm, and the length is 35mm
S2: 114kg of crushed stone with 5-25mm grade, 12kg of water and 2kg of water reducing agent are poured into a stirrer for wet stirring for 115s
S3: discharging after stirring, putting the concrete into a mold for 24 hours, then demolding and maintaining.
Example 4
A preparation method of anti-crack concrete for shield segment comprises the following steps:
s1: 45kg of PII-52.5-grade portland cement, 5.8kg of fly ash, 56kg of sand and 10kg of gum dipping structural basalt fiber are poured into a stirrer for dry mixing for 50-60 s, and the fiber used for the mixing is 1mm in diameter and 35mm in length
S2: 114kg of crushed stone with 5-25mm grade, 14kg of water and 2kg of water reducing agent are poured into a stirrer for wet stirring for 115s
S3: discharging after stirring, putting the concrete into a mold for 24 hours, then demolding, and maintaining.
Example 5
A preparation method of anti-crack concrete for shield segments comprises the following steps:
s1: 44kg of PII-52.5-grade portland cement, 5.1kg of fly ash, 55kg of sand and 10.2kg of gum dipping structure type basalt fiber are poured into a stirrer for dry mixing for 60s, the diameter of the fiber used for the mixing is 1mm, and the length of the fiber is 35mm
S2: taking 116kg of crushed stone of 5-25mm grade, 13kg of water and 2.05kg of water reducing agent, pouring into a stirrer for wet mixing for 120s
S3: discharging after stirring, putting the concrete into a mold for 24 hours, then demolding and maintaining.
Example 6
A preparation method of anti-crack concrete for shield segments comprises the following steps:
s1: 44kg of PII-52.5-grade portland cement, 5.1kg of fly ash, 55kg of sand and 10.6kg of gum dipping structure type basalt fiber are poured into a stirrer for dry mixing for 60s, the diameter of the fiber used for the mixing is 1mm, and the length of the fiber is 35mm
S2: taking 116kg of crushed stone with 5-25mm grade, 13kg of water and 2.2kg of water reducing agent, pouring into a stirrer for wet mixing for 118s
S3: discharging after stirring, putting the concrete into a mold for 24 hours, then demolding and maintaining.
Comparative example 1
S1: 43kg of PII-52.5-grade portland cement, 5kg of fly ash and 54kg of sand are taken and poured into a stirrer for dry mixing for 53s
S2: 114kg of crushed stone with 5-25mm grade, 12kg of water and 2kg of water reducing agent are poured into a stirrer for wet stirring for 120s
S3: discharging after stirring, putting the concrete into a mold for 24 hours, then demolding and maintaining.
Comparative example 2
S1: 45kg of PII-52.5-grade portland cement, 5.8kg of fly ash and 56kg of sand are taken and poured into a stirrer for dry mixing for 51s
S2: 114kg of crushed stone with 5-25mm grade, 12kg of water and 2kg of water reducing agent are poured into a stirrer for wet mixing for 115s
S3: discharging after stirring, putting the concrete into a mold for 24 hours, then demolding and maintaining.
Comparative example 3
S1: 44kg of PII-52.5 level portland cement, 5.1kg of fly ash and 55kg of sand are taken and poured into a stirrer for dry mixing for 60s
S2: taking 116kg of crushed stone with 5-25mm grade, 13kg of water and 2.05kg of water reducing agent, pouring into a stirrer for wet stirring for 120s
S3: discharging after stirring, putting the concrete into a mold for 24 hours, then demolding and maintaining.
The concrete prepared in the above examples and comparative examples and used for the crack resistance of the shield segment is subjected to relevant tests by adopting the following evaluation indexes and detection methods:
concrete workability: and (3) measuring the difference value of the height of the barrel and the height of the highest point of the collapsed concrete according to the operation method of acceptance restriction on construction quality of concrete structural engineering (GB50204-2002), namely the collapse degree.
Concrete compressive strength: and respectively measuring the 7-day axial compression strength and the 28-day axial compression strength of the standard test block according to a test method in the concrete physical mechanical property test method standard GB/T50081-2019.
Number and width of cracks: the number and the width of the cracks are measured by a scale magnifier according to the standard of concrete structure test methods GB/T50152 and 2012.
The measured performance indexes of the examples and the comparative examples are shown in the following tables 1 and 2.
TABLE 1
| Performance test index | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 |
| Slump (mm) | 40 | 51 | 42 | 45 | 36 | 34 |
| 7d axial compressive strength (MPa) | 55.6 | 52.6 | 56.6 | 57.8 | 58 | 53.5 |
| 28d axial compressive strength (MPa) | 57.8 | 56.2 | 59 | 60 | 62 | 61 |
| Test block crack number (mm) | 5 | 8 | 7 | 7 | 6 | 5 |
| Maximum crack width of test block (mm) | 0.1 | 0.12 | 0.11 | 0.15 | 0.16 | 0.1 |
TABLE 2
| Performance test index | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Slump (mm) | 80 | 95 | 86 |
| 7d axial compressive strength (MPa) | 50.1 | 52 | 53.1 |
| 28d axial compressive strength (MPa) | 54 | 55.6 | 56 |
| Test block crack number (mm) | 15 | 25 | 20 |
| Maximum crack width of test block (mm) | 1 | The collapse of the test block cannot be measured | 2 |
The analysis data in the table above show that the slump and the compressive strength of the prepared concrete serving as the crack resistance of the shield segment are both improved to a relatively obvious extent, which indicates that the workability and the bearing capacity of the concrete are both improved to a certain extent;
from the above table analysis data it can be derived: the number and the width of the cracks of the concrete added with the gumming structure type anti-cracking fibers are obviously reduced, which shows that the concrete has obvious effect on the anti-cracking of the shield segment, thereby improving the durability of the shield segment.
As can be seen from example 1, example 2 and comparative example 1: the dosage of the polycarboxylic acid high-performance water reducing agent has certain influence on the workability and compressive strength of concrete: the more the water reducing agent is, the greater the concrete segregation rate is, and the lower the compressive strength is.
As can be seen from examples 3, 4 and comparative example 2: the water consumption has certain influence on the workability of concrete: within a certain range, the larger the water consumption is, the better the workability of the concrete is, but the crack-resistant concrete is not greatly influenced.
The above is only a preferred embodiment of the present invention, and it is only an explanation of the present invention, and it is not a limitation of the present invention, and a person skilled in the art can make modifications to the present embodiment as needed without inventive contribution after reading the present specification, but all of them fall within the scope of the present invention as claimed in the claims.
Claims (9)
1. An anti-crack concrete for shield segments, characterized by comprising by weight: 450 parts of cement 430-.
2. The anti-cracking concrete for the shield segment according to claim 1, characterized in that the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and is a compound product of a carboxylic acid graft multipolymer and other effective additives.
3. The crack-resistant concrete for shield segments according to claim 1, wherein the dipped structure basalt fiber has a diameter of 1mm, a length of 25-30mm and a density of 2.0g/cm 2 。
4. The anti-crack concrete for the shield segment according to claim 1 or 3, wherein the preparation method of the dipped structure type basalt fiber comprises the following steps: the method comprises the steps of carrying out high-temperature 1500 ℃ hot melting on pure natural volcanic rock ore, then moving the ore into a tank furnace machine, adding an impregnating compound into the tank furnace machine to impregnate unformed basalt, then placing unformed basalt fiber into a wire drawing machine to carry out pultrusion to obtain basalt fiber precursor, and finally carrying out twisting forming on the precursor.
5. The anti-cracking concrete for the shield segment as claimed in claim 1, wherein the cement has a fineness grade of 376, a loss on ignition of 4%, a sulfur trioxide content of 3%, an alkali content of 0.5%, an initial setting time of 50-60min, a final setting time of 500-600min, a 28d compressive strength of 42.5MPa or more, and a 28d flexural strength of 6.5MPa or more.
6. The anti-crack concrete for shield segments according to claim 1, wherein the fineness modulus of the sand is 2.5, the apparent density is 2900kg/m, the loose bulk density is 1400kg/m for thin-wall labor, the mud content is 1.0% by mass, the mud cake content is 0.4% by mass, the water content of the sand is 0.00%, and the sulfide and sulfate content is SO 3 0.38% by mass of chlorideThe content of Cl ions calculated by mass is 0.01 percent, the void ratio is 37 percent, and the expansion ratio is 0.06 percent.
7. The anti-crack concrete for the shield segment according to claim 1, wherein the crushed stone is crushed stone of 5-25mm series.
8. The anti-crack concrete for the shield segment according to claim 1 or 7, wherein the crushed stones are harvested in a high-density loose-packing mode at 2950kg/m, the crushed stones are harvested in a high-density loose-packing mode at 1626kg/m, the mud content or the dust content is 0.6% by mass, the mud cake content is 0.00% by mass, the needle-shaped particles content is 3.8% by mass, the organic matter content is qualified, the quality loss of the robustness index is 0.33%, the void ratio is 24%, the water absorption rate is 1%, the expansion rate is 1%, and the compressive strength/concrete strength of the rocks is greater than or equal to 2 MPa.
9. The preparation method of the anti-crack concrete for the shield segment is characterized by comprising the following steps of:
s1: pouring cement, fly ash, sand and gum dipping structural basalt fiber into a stirrer for dry mixing for 50-60 s;
s2: pouring crushed stone of 5-25mm grade, water and a water reducing agent into a stirrer for wet mixing for 110-120 s;
s3: discharging after stirring, putting the concrete into a mold for 24 hours, then demolding and maintaining.
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Cited By (1)
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| CN117776633A (en) * | 2024-02-27 | 2024-03-29 | 中铁二十二局集团轨道工程有限公司 | Preparation method of shield segment concrete |
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