CN108529989B - Concrete for shield segment and preparation method thereof - Google Patents

Concrete for shield segment and preparation method thereof Download PDF

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Publication number
CN108529989B
CN108529989B CN201810582784.1A CN201810582784A CN108529989B CN 108529989 B CN108529989 B CN 108529989B CN 201810582784 A CN201810582784 A CN 201810582784A CN 108529989 B CN108529989 B CN 108529989B
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concrete
parts
mixture
stirring
sand
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CN108529989A (en
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杨寒冰
黎攀
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BEIJING GANGCHUANG RUIBO CONCRETE CO LTD
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BEIJING GANGCHUANG RUIBO CONCRETE CO LTD
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/08Lining with building materials with preformed concrete slabs
    • E21D11/086Methods of making concrete lining segments
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • C04B2201/52High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]

Abstract

The invention relates to concrete for shield segments and a preparation method thereof, belongs to the field of high-performance concrete, and aims to develop concrete with high strength and good impermeability. The concrete for the shield segment comprises the following raw materials in parts by weight: 420 parts of ordinary portland cement, 120 parts of mineral admixture, 580 parts of sand 540, 790 parts of crushed stone 770 with the diameter of 5-25mm, 3-4.8 parts of admixture, 120 parts of polypropylene fiber 110, 8-9.2 parts of water reducer and 150 parts of water 140. The shield segment made of the concrete has high strength and strong impermeability, and ensures the waterproof performance and the bearing performance of the tunnel.

Description

Concrete for shield segment and preparation method thereof
Technical Field
The invention relates to the field of high-performance concrete, in particular to concrete for shield segments and a preparation method thereof.
Background
The shield segment is a main assembly component for shield construction, is the innermost barrier of the tunnel and plays a role in resisting soil layer pressure, underground water pressure and some special loads. The shield segment is usually produced by adopting high-strength impervious concrete so as to ensure reliable bearing performance and waterproof performance, and the production mainly utilizes a finished segment mould to be formed after concrete is poured in a sealing manner.
The shield segment is a permanent lining structure of a shield tunnel, and the quality of the shield segment is directly related to the overall quality and safety of the tunnel in the process of using the shield segment, so that the waterproof performance and the bearing performance of the tunnel are influenced. Therefore, it is necessary to develop a concrete having high strength and simultaneously having good anti-permeability properties.
Disclosure of Invention
The invention aims to provide concrete for shield segments, and the shield segments made of the concrete have high strength and strong impermeability, so that the waterproof performance and the bearing performance of a tunnel are ensured.
The above object of the present invention is achieved by the following technical solutions: the concrete for the shield segment is characterized by comprising the following raw materials in parts by weight: 420 parts of ordinary portland cement, 120 parts of mineral admixture, 580 parts of sand 540, 790 parts of crushed stone 770 with the diameter of 5-25mm, 3-4.8 parts of admixture, 120 parts of polypropylene fiber 110, 8-9.2 parts of water reducer and 150 parts of water 140.
Preferably, the additive comprises 2, 2-bis (4-methylphenyl) hexafluoropropane and 1, 2-bis (2-trifluoromethylphenyl) ethane.
Preferably, the mass ratio of the 2, 2-bis (4-methylphenyl) hexafluoropropane to the 1, 2-bis (2-trifluoromethylphenyl) ethane is 5: 1.
Preferably, the fineness of the polypropylene fiber is 12-14g/9000m, and the length of the polypropylene fiber is 13-17 mm.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
Preferably, the sand has a fineness modulus of 2.5 and an apparent density of 2690kg/m3The loose bulk density is 1640kg/m3The porosity is 39%, the mud content is 0.6%, the mud block content is 0.1%, and the alkali aggregate reaction expansion rate in 14 days is 0.08%.
Preferably, the mineral admixture is a mixture of silica fume and fly ash, and the mass ratio of the silica fume to the fly ash is 1: 1.
Preferably, the crushed stone with the thickness of 5-25mm has the apparent density of 2800kg/m3The loose bulk density was 1540kg/m3The loose-packing porosity was 45%, the crushing value was 7%, the sludge content was 0.5%, the needle-like flaky particle content was 4%, the sulfide and sulfate content was 0.18%, and the alkali aggregate reaction expansion rate in 14 days was 0.08%.
The invention also aims to provide a preparation method of the concrete for the shield segment.
The above purpose of the invention is realized by the following technical scheme, and the preparation method of the concrete for the shield segment comprises the following steps:
s1: adding sand and crushed stone of 5-25mm into a stirrer for stirring for 10-14s to obtain a mixture;
s2: adding ordinary portland cement, a mineral admixture and polypropylene fibers into the mixture obtained in S1, and stirring for 14-18S to obtain a mixture;
s3: and (3) fully stirring and mixing the admixture, the water reducing agent and the water, then adding the mixture obtained in the step S2 to stir for 40-60S, and discharging after stirring to obtain the finished concrete.
In conclusion, the invention has the following beneficial effects:
1. the concrete for the shield segment prepared by the invention has good anti-permeability performance and compression resistance performance, and the waterproof performance and the bearing performance of the tunnel are ensured.
2. The polypropylene fiber can effectively prevent the concrete from generating cracks in the plastic period, and the fiber has a three-dimensional space network structure in the concrete, so that the fiber plays a role in supporting aggregate and prevents the sedimentation of coarse aggregate and fine aggregate to a certain extent; meanwhile, the water bleeding phenomenon on the surface of the concrete is reduced, and the large volume shrinkage in the plasticity period caused by rapid water loss on the surface of the concrete is effectively prevented, so that the cracks on the surface of the concrete in the plasticity period are inhibited. Meanwhile, the strength of the concrete in the plastic state is extremely low, and the fibers can bear tensile stress generated by drying shrinkage in the concrete in the plastic state, so that the generation of cracks in the concrete in the plastic state is reduced and prevented, and the mechanical property and the impermeability of the concrete are effectively improved.
3. The invention utilizes the synergistic effect of 2, 2-bis (4-methylphenyl) hexafluoropropane and 1, 2-bis (2-trifluoromethylphenyl) ethane to reduce the generation and expansion of internal cracks of concrete and effectively improve the mechanical property and the impermeability of the concrete.
4. The invention utilizes the mineral admixture to mix with the cement, which not only reduces the consumption of the cement, but also reduces the hydration heat of the cement and delays the hydration temperature peak, thereby avoiding the generation of cracks on the surface of the concrete and improving the anti-cracking, anti-erosion and anti-carbonization performances of the concrete.
Detailed Description
All materials referred to in the examples of the present invention are commercially available.
First, an embodiment is fabricated.
Example 1
S1: adding 560kg of sand and 780kg of crushed stone with the particle size of 5-25mm into a stirrer for stirring for 12s to obtain a mixture; s2: adding 410kg of ordinary portland cement, 55kg of silica fume, 55kg of fly ash and 115kg of polypropylene fiber into the mixture obtained in S1, and stirring for 16S to obtain a mixture; the fineness of the polypropylene fiber is 13g/9000m, and the length of the polypropylene fiber is 15 mm;
s3: and 3kg of 2, 2-bis (4-methylphenyl) hexafluoropropane, 0.6kg of 1, 2-bis (2-trifluoromethylphenyl) ethane, 8.6kg of polycarboxylic acid water reducing agent and 145kg of water are taken, fully stirred and mixed, then added into the mixture obtained in the step S2, stirred for 50S, and discharged after stirring is finished, so that the finished concrete is obtained.
Example 2
S1: adding 540kg of sand and 770kg of crushed stone with the particle size of 5-25mm into a stirrer for stirring for 10s to obtain a mixture;
s2: adding 420kg of ordinary portland cement, 60kg of silica fume, 50kg of fly ash and 115kg of polypropylene fiber into the mixture obtained in S1, and stirring for 18S to obtain a mixture; the fineness of the polypropylene fiber is 12g/9000m, and the length of the polypropylene fiber is 13 mm;
s3: 2.5kg of 2, 2-bis (4-methylphenyl) hexafluoropropane, 0.5kg of 1, 2-bis (2-trifluoromethylphenyl) ethane, 9.2kg of polycarboxylic acid water reducing agent and 150kg of water are taken, fully stirred and mixed, then added into the mixture obtained in S2 to be stirred for 40S, and discharged after the stirring is finished, thus obtaining the finished concrete.
Example 3
S1: adding 580kg of sand and 770kg of crushed stone with the particle size of 5-25mm into a stirrer for stirring for 10s to obtain a mixture;
s2: adding 420kg of ordinary portland cement, 50kg of silica fume, 60kg of fly ash and 120kg of polypropylene fiber into the mixture obtained in S1, and stirring for 18S to obtain a mixture; the fineness of the polypropylene fiber is 12g/9000m, and the length of the polypropylene fiber is 17 mm;
s3: 2.5kg of 2, 2-bis (4-methylphenyl) hexafluoropropane, 0.5kg of 1, 2-bis (2-trifluoromethylphenyl) ethane, 9.2kg of polycarboxylic acid water reducing agent and 140kg of water are taken, fully stirred and mixed, then added into the mixture obtained in S2 to be stirred for 60S, and discharged after the stirring is finished, thus obtaining the finished concrete.
Example 4
S1: adding 540kg of sand and 770kg of crushed stone with the particle size of 5-25mm into a stirrer for stirring for 14s to obtain a mixture;
s2: adding 400kg of ordinary portland cement, 60kg of silica fume, 55kg of fly ash and 110kg of polypropylene fiber into the mixture obtained in S1, and stirring for 16S to obtain a mixture; the fineness of the polypropylene fiber is 14g/9000m, and the length of the polypropylene fiber is 13 mm;
s3: 2.5kg of 2, 2-bis (4-methylphenyl) hexafluoropropane, 0.7kg of 1, 2-bis (2-trifluoromethylphenyl) ethane, 8kg of polycarboxylic acid water reducing agent and 150kg of water are taken, fully stirred and mixed, then added into the mixture obtained in S2 to be stirred for 50S, and discharged after the stirring is finished, thus obtaining the finished concrete.
Example 5
S1: adding 580kg of sand and 790kg of crushed stone with the particle size of 5-25mm into a stirrer for stirring for 14s to obtain a mixture;
s2: adding 400kg of ordinary portland cement, 50kg of silica fume, 50kg of fly ash and 115kg of polypropylene fiber into the mixture obtained in S1, and stirring for 16S to obtain a mixture; wherein the titer of the polypropylene fiber is 14g/9000m, and the length of the polypropylene fiber is 17 mm;
s3: 3.5kg of 2, 2-bis (4-methylphenyl) hexafluoropropane, 0.7kg of 1, 2-bis (2-trifluoromethylphenyl) ethane, 8kg of polycarboxylic acid water reducing agent and 140kg of water are taken, fully stirred and mixed, then added into the mixture obtained in S2 to be stirred for 40S, and discharged after the stirring is finished, thus obtaining the finished concrete.
Example 6
S1: adding 540kg of sand and 790kg of crushed stone with the particle size of 5-25mm into a stirrer for stirring for 10s to obtain a mixture;
s2: adding 400kg of ordinary portland cement, 60kg of silica fume, 60kg of fly ash and 120kg of polypropylene fiber into the mixture obtained in S1, and stirring for 14S to obtain a mixture; the fineness of the polypropylene fiber is 14g/9000m, and the length of the polypropylene fiber is 13 mm;
s3: 3.5kg of 2, 2-bis (4-methylphenyl) hexafluoropropane, 0.5kg of 1, 2-bis (2-trifluoromethylphenyl) ethane, 8kg of polycarboxylic acid water reducing agent and 150kg of water are taken, fully stirred and mixed, then added into the mixture obtained in S2 to be stirred for 60S, and discharged after the stirring is finished, thus obtaining the finished concrete.
Second, a comparative example was prepared.
Comparative example 1
S1: adding 560kg of sand and 780kg of crushed stone with the particle size of 5-25mm into a stirrer for stirring for 12s to obtain a mixture;
s2: adding 410kg of ordinary portland cement, 55kg of silica fume, 55kg of fly ash and 115kg of polypropylene fiber into the mixture obtained in S1, and stirring for 16S to obtain a mixture; the fineness of the polypropylene fiber is 13g/9000m, and the length of the polypropylene fiber is 15 mm;
s3: and (3) taking 8.6kg of polycarboxylic acid water reducing agent and 145kg of water, fully stirring and mixing, then adding the polycarboxylic acid water reducing agent and the water into the mixture obtained in the step S2, stirring for 50S, and discharging after stirring to obtain the finished concrete.
Comparative example 2
S1: adding 560kg of sand and 780kg of crushed stone with the particle size of 5-25mm into a stirrer for stirring for 12s to obtain a mixture;
s2: adding 410kg of ordinary portland cement, 55kg of silica fume, 55kg of fly ash and 115kg of polypropylene fiber into the mixture obtained in S1, and stirring for 16S to obtain a mixture; the fineness of the polypropylene fiber is 13g/9000m, and the length of the polypropylene fiber is 15 mm;
s3: and 3.6kg of 2, 2-bis (4-methylphenyl) hexafluoropropane, 8.6kg of polycarboxylic acid water reducing agent and 145kg of water are fully stirred and mixed, then the mixture obtained in the step S2 is added to be stirred for 50S, and the mixture is discharged after the stirring is finished, so that the finished concrete is obtained.
Comparative example 3
S1: adding 560kg of sand and 780kg of crushed stone with the particle size of 5-25mm into a stirrer for stirring for 12s to obtain a mixture;
s2: adding 410kg of ordinary portland cement, 55kg of silica fume, 55kg of fly ash and 115kg of polypropylene fiber into the mixture obtained in S1, and stirring for 16S to obtain a mixture; the fineness of the polypropylene fiber is 13g/9000m, and the length of the polypropylene fiber is 15 mm;
s3: and (3) taking 3.6kg of 1, 2-bis (2-trifluoromethylphenyl) ethane, 8.6kg of polycarboxylic acid water reducing agent and 145kg of water, fully stirring and mixing, then adding the mixture obtained in the step S2, stirring for 50S, and discharging after stirring to obtain the finished concrete.
In each of the above examples and comparative examples, the fineness modulus of sand was 2.5, and the apparent density was 2690kg/m3The loose bulk density is 1640kg/m3The porosity is 39%, the mud content is 0.6%, the mud block content is 0.1%, and the alkali aggregate reaction expansion rate in 14 days is 0.08%.
The crushed stone with the thickness of 5-25mm has the apparent density of 2800kg/m3The loose bulk density was 1540kg/m3The loose-packing porosity was 45%, the crushing value was 7%, the sludge content was 0.5%, the needle-like flaky particle content was 4%, the sulfide and sulfate content was 0.18%, and the alkali aggregate reaction expansion rate in 14 days was 0.08%.
And thirdly, testing the performances of the concrete for the shield segment prepared in the embodiment and the comparative example.
The evaluation indexes and detection methods adopted by the concrete for the shield segment prepared in the above embodiments and the comparative examples are as follows:
resistance to chloride ion permeation: and testing the chloride ion penetration depth of the concrete standard test block according to a rapid chloride ion migration coefficient method in GB/T50082 test method standard for long-term performance and durability of common concrete.
Water penetration resistance: and (3) testing the water penetration depth of the concrete standard test block according to a step-by-step pressurization method in GB/T50082 test method standard for long-term performance and durability of common concrete.
And (3) carbonization resistance: the carbonization depth of the concrete standard test block on the 28 th day is tested according to the carbonization experiment in GB/T50082 test method standard for long-term performance and durability of common concrete.
Compressive strength: the compression strength of the concrete standard test block with 100% guarantee rate measured on 7 th day and 28 th day is detected according to the specification in GB/T50010 concrete structure design Specification.
The performance indexes of the above examples and comparative examples are shown in table 1.
Table 1 results of performance test of concrete for shield segment prepared in each example and comparative example
As can be seen from the table above, the concrete for the shield segment prepared by the invention has good anti-permeability performance and compression resistance performance, and guarantees the waterproof performance and the bearing performance of the tunnel.
In the comparative example 1, 2-bis (4-methylphenyl) hexafluoropropane and 1, 2-bis (2-trifluoromethylphenyl) ethane were not added, so that the prepared concrete had many cracks therein, and the impermeability and compressive strength of the prepared concrete were low, which were far lower than those of the concrete for shield segments prepared in example 1.
In comparative example 2 and comparative example 3, only 2, 2-bis (4-methylphenyl) hexafluoropropane and 1, 2-bis (2-trifluoromethylphenyl) ethane were added, respectively, and the effect of using 2, 2-bis (4-methylphenyl) hexafluoropropane and 1, 2-bis (2-trifluoromethylphenyl) ethane alone was lower than the synergistic effect of the two, resulting in a decrease in the impermeability and compressive strength of the prepared concrete for shield segments, which was lower than that of the concrete for shield segments prepared in example 1.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (6)

1. The concrete for the shield segment is characterized by comprising the following raw materials, by weight, 400-420 parts of ordinary portland cement, 120 parts of mineral admixture, 580 parts of sand 540-580 parts of gravel 770-790 parts of admixture, 120 parts of polypropylene fiber 110-790 parts of water reducer 8-9.2 parts of water 140-150 parts of sand; the additive consists of 2, 2-bis (4-methylphenyl) hexafluoropropane and 1, 2-bis (2-trifluoromethylphenyl) ethane in a mass ratio of 5: 1; the mineral admixture is a mixture of silica fume and fly ash, and the mass ratio of the silica fume to the fly ash is 1: 1.
2. The concrete for shield segments according to claim 1, wherein the fineness of the polypropylene fibers is 12-14g/9000m, and the length of the polypropylene fibers is 13-17 mm.
3. The concrete for shield segments according to claim 1, wherein the water reducer is a polycarboxylic acid water reducer.
4. The concrete for shield segments according to claim 1, wherein the sand has a fineness modulus of 2.5 and an apparent density of 2690kg/m3 The loose bulk density is 1640kg/m3 The porosity is 39%, the mud content is 0.6%, the mud block content is 0.1%, and the alkali aggregate reaction expansion rate in 14 days is 0.08%.
5. The concrete for shield segments according to claim 1, wherein the crushed stone of 5-25mm has an apparent density of 2800kg/m3 The loose bulk density was 1540kg/m3 The loose-packing porosity was 45%, the crushing value was 7%, the sludge content was 0.5%, the needle-like flaky particle content was 4%, the sulfide and sulfate content was 0.18%, and the alkali aggregate reaction expansion rate in 14 days was 0.08%.
6. The method for preparing the concrete for the shield segment according to claim 1, which comprises the following steps:
s1, adding the sand and the crushed stone of 5-25mm into a stirrer to be stirred for 10-14S to obtain a mixture;
s2, adding ordinary portland cement, a mineral admixture and polypropylene fibers into the mixture obtained in the step S1, and stirring for 14-18S to obtain a mixture;
and S3, fully stirring and mixing the admixture, the water reducing agent and the water, then adding the mixture obtained in the step S2, stirring for 40-60S, and discharging after stirring to obtain the finished concrete.
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