CN117069424B - Prestressed lining concrete and preparation method and construction method thereof - Google Patents

Prestressed lining concrete and preparation method and construction method thereof Download PDF

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CN117069424B
CN117069424B CN202310805222.XA CN202310805222A CN117069424B CN 117069424 B CN117069424 B CN 117069424B CN 202310805222 A CN202310805222 A CN 202310805222A CN 117069424 B CN117069424 B CN 117069424B
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concrete
parts
slag powder
prestressed
lining
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CN117069424A (en
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梁俊
谢祥明
邓选滔
余青山
汪永剑
姚楚康
胡磊
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Guangdong Hydropower Second Bureau Group Co ltd
GDH Pearl River Water Supply Co Ltd
Guangdong Construction Engineering Group Co Ltd
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Guangdong Hydropower Second Bureau Group Co ltd
GDH Pearl River Water Supply Co Ltd
Guangdong Construction Engineering Group Co Ltd
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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
    • 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
    • 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
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04—Lining with building materials
    • E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • 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
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • 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
    • C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
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Abstract

The invention provides prestressed lining concrete, a preparation method and a construction method thereof, and relates to the field of building materials. The prestressed lining concrete comprises the following components: in the implementation process, two kinds of slag powder with different specific surface areas are adopted to reduce the shrinkage rate of hardened concrete and reduce the heat insulation temperature rise of the concrete, thereby being beneficial to improving the anti-cracking effect of the concrete; in addition, superplasticizer and retarder are added into the concrete as additives for improving the physical property, setting time, mechanical property and durability of the concrete, so that the concrete has the advantages of low early hydration heat, high strength and good durability.

Description

Prestressed lining concrete and preparation method and construction method thereof
Technical Field
The invention relates to the field of building materials, in particular to prestressed lining concrete, a preparation method and a construction method thereof.
Background
The prestressed concrete structure is developed from a common reinforced concrete structure, and the principle is that a certain prestress is applied to the concrete in advance by a certain method at the position where tensile stress is generated in the structural load so as to offset or partially offset the tensile stress generated when the structure is loaded, so that the cracking or crack development of the tensile concrete is delayed, and the structure is free from cracks or oversized cracks under the use load. The theoretical basis of prestressed concrete includes: and (1) the prestress makes the concrete an elastic material. The prestressed concrete member is regarded as an elastic material which can be pulled and pressed from the original brittle material with weak tensile strength and strong compressive strength after the concrete is pre-pressed. The concrete is subjected to two forces, an internal pre-stress and an external load. The tensile stress generated by the external load is offset by the tensile stress generated by the precompression. (2) The prestressing is applied to enable the cooperation of the high-strength steel and the concrete. Prestressed concrete is regarded as a combination of high-strength steel and concrete materials, and steel bars are used for bearing tensile force and concrete for bearing compressive force so as to resist external force bending moment like reinforced concrete. To fully utilize the strength of high-strength steel bars in a concrete structure, the steel bars must be pre-tensioned during concrete combination to complete a certain deformation. Prestressing is an effective means of fully utilizing high-strength steel bars, and prestressed concrete can be regarded as an extension of reinforced concrete. (3) prestressing is to achieve partial load balancing. The prestressing force is applied in an attempt to balance some or all of the load on the component. If the bending moment generated by the prestress on the section is equal to the bending moment generated by the external load, the component is in an axle center compression state. Three different theoretical bases provide theoretical basis for elastic design, shaping design and balance design of the prestress structure. Compared with common reinforced concrete, the prestressed concrete has the following main advantages:
(1) Saving engineering materials and reducing the dead weight of the structure. The prestressed concrete member must adopt high-strength reinforced steel bar and high-strength concrete, so that the cross section of the member can be reduced, steel and concrete can be saved, and the dead weight of the structure can be lightened.
(2) The crack resistance and rigidity of the member are improved. After the prestress is applied, the member can not generate cracks and delay the occurrence of the cracks under the action of load, the rigidity of the member is correspondingly improved, and the durability of the structure is enhanced.
(3) And the shearing force and the main tensile stress of the concrete beam are reduced. Due to the effect of balanced load, the shearing force of the support part of the prestress component is reduced, and due to the existence of the concrete prestress, the main tensile stress under the effect of the load is reduced, so that the thickness of the beam web is reduced, and the dead weight of the structure is reduced.
(4) The structure is safe, and the quality is reliable. When the prestress is applied, the prestress rib and the concrete are subjected to one-time strength detection, and the prestress rib and the concrete play a role in pre-checking the safety and the quality assurance of the structure.
Based on the above advantages of the prestressed concrete structure, more researches are directed to prestressed concrete, such as the concrete for preparing prestressed high-strength concrete pipe piles disclosed in chinese patent application 201410119486.0, in which each cubic concrete is composed of the following components: portland cement: 360-500kg; s95 mineral powder: 50-150kg; superfine mineral powder: 0-50kg; sand: 700-750kg; broken stone: 1150-1250kg; water: 115-151kg; water reducing agent: 3.68-5.4kg; exciting agent: 9.2-10.8kg. The concrete has low cost and good strength and erosion resistance. Meanwhile, the preparation method of the prestressed high-strength concrete pipe pile is simple and easy to operate, is beneficial to reducing the preparation cost and improves the erosion resistance of the pipe pile.
As further disclosed in chinese patent application 201911381697.0, a high-performance expansive prestressed concrete comprising a binder, a modified water-absorbing zeolite, an expanding agent, a water-reducing agent, water, a fine aggregate and a coarse aggregate, and a method for preparing the same; the modified water-absorbing zeolite is obtained by two-step modification and then vacuum water saturation. The concrete comprehensively uses the internal curing technology and the shrinkage compensation technology of the concrete, can fully hydrate the expanding agent under the condition of maintaining a lower water-cement ratio, and solves the engineering problems that the expanding agent cannot be applied to high-strength concrete with a low water-cement ratio, and the later strength of the concrete is lost due to excessive use of the expanding agent.
However, the research on the prestressed lining concrete for the deep-buried long tunnel is few, and the temperature crack prevention and control of the prestressed lining concrete for the tunnel is a great challenge, so that the prestressed lining concrete with excellent mechanical property and durability and thermal insulation temperature rise meeting engineering design requirements and temperature control and crack prevention requirements needs to be developed and a preparation method thereof are needed.
Disclosure of Invention
Based on the defects existing in the prior art, the invention aims to provide the prestressed lining concrete which has excellent mechanical property and durability, and can meet the engineering design requirements of adiabatic temperature rise and the temperature control and anti-cracking requirements, and the preparation method and the construction method thereof.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
on the one hand, the invention provides prestressed lining concrete, which comprises the following components in parts by weight:
230-260 parts of cement, 50-80 parts of fly ash, 120-150 parts of slag powder, 700-800 parts of sand, 1000-1100 parts of crushed stone, 150-170 parts of water, 6-10 parts of superplasticizer and 0.5-1.5 parts of retarder;
preferably, the prestressed lining concrete comprises the following components in parts by weight:
253 parts of cement, 69 parts of fly ash, 138 parts of slag powder, 770 parts of sand, 1024 parts of crushed stone, 161 parts of water, 8.3 parts of superplasticizer and 0.92 part of retarder;
Wherein the cement is ordinary Portland cement with P.O52.5MPa.
The slag powder is a mixture of slag powder A with the specific surface area of 550m 2/kg and slag powder B with the specific surface area of 450m 2/kg; the mass ratio of the slag powder A to the slag powder B is 5-1:1-5; preferably, the mass ratio of the slag powder A to the slag powder B is 1:1.
In the implementation process, the invention unexpectedly discovers that the increase of the specific surface area of the slag powder can increase the early self-shrinkage of the concrete, and the adoption of the slag powder with different specific surface areas as the admixture of the prestressed lining concrete can better improve the compactness of the concrete. The mass ratio of the slag powder with two different specific surface areas is controlled to be 5-1:1-5, and the high-quality combination of the specific surface areas of the slag powder has a certain effect on reducing the early-stage adiabatic temperature rise, so that the early-stage hydration heat of concrete is reduced, and the later-stage strength of mineral admixture is fully utilized.
The specific surface area of the slag powder is more than or equal to 400m 2/kg.
The sand is common natural sand.
The superplasticizer is a polycarboxylic acid high-performance water reducer;
The retarder is an organic concrete retarder, and the organic concrete retarder is one or more of sodium lignin sulfonate, tartaric acid, citric acid and sodium gluconate;
Preferably, the retarder is a mixture of sodium lignin sulfonate, tartaric acid and sodium gluconate; the mass ratio of the sodium lignin sulfonate to the sodium tartrate to the sodium gluconate is 1-2:1:1-2; further preferably, the mass ratio of the sodium lignin sulfonate, the tartaric acid and the sodium gluconate is 1:1:1.
The compound retarder composed of sodium lignin sulfonate, tartaric acid and sodium gluconate is selected, so that the mechanical property and durability of the formed concrete can be improved.
In some preferred embodiments, the mass ratio of water to the total amount of cement and fly ash and slag powder is 0.35:1; preferably 0.35:1.
The invention surprisingly discovers that controlling the mass ratio of water to the total amount of cement, fly ash and slag powder to be 0.35:1 in the implementation process can ensure the working fluidity in the concrete preparation process and also can ensure the mechanical property and durability of the concrete.
The mass ratio of the superplasticizer to the retarder is 5-10:0.2-1; preferably 8.3:0.92.
According to the application, the superplasticizer and the retarder are added into the concrete as additives in the implementation process for improving the flowability, the setting time, the mechanical property and the durability of the concrete, and the mass ratio of the superplasticizer to the retarder is controlled to be 5-10:0.2-1, so that the fluidity of the concrete is obviously improved, the setting time is prolonged, the working performance of the concrete is improved, the obtained concrete can be just applied to a tunnel lining, and the prestressed lining concrete with the mechanical property, the durability superiority and the heat insulation temperature rise meeting engineering design requirements and the temperature control anti-cracking requirement is prepared by the raw material components.
On the other hand, the application also provides a preparation method of the prestressed lining concrete, which comprises the following steps:
S1, uniformly mixing sand and broken stone to obtain a mixture C;
s2, uniformly mixing cement, fly ash and slag powder to obtain a mixture D;
And S3, mixing the mixture C and the mixture D, adding water, superplasticizer and retarder, and stirring and mixing until the mixture is uniform paste, thus obtaining the prestressed lining concrete.
In still another aspect, the application further provides a construction method of the concrete applied to the deep-buried long tunnel lining, comprising the following steps:
Firstly, installing a steel bar, a steel strand, an anchor groove and a water stop copper sheet by using a steel bar trolley, shifting the steel bar trolley after the installation, shifting the needle beam steel mould trolley into position, and plugging and reinforcing an end template;
Step two, transporting the concrete prepared by the method to a tunnel working well (vertical shaft) by adopting a stirring transport vehicle, sliding the concrete to the bottom of the vertical shaft by utilizing an anti-separation chute arranged in the vertical shaft, transporting the concrete to a pouring working surface by using the concrete transport vehicle, and pouring by using a template trolley;
Step three, when pouring lining concrete below the waist of the tunnel, the concrete pump simultaneously conveys the concrete to the inlets at two sides of the waist of the tunnel through a conveying pump pipe, a Y-shaped three-way pipe and a soft rubber pipe, synchronously and uniformly pouring the lining concrete below the waist, and after the concrete pump is conveyed into the bins, vibrating the lining concrete through an attached vibrator, and adopting an inserted vibrator to vibrate the joint pouring window to ensure that pouring is compact;
And fourthly, after pouring concrete below the waist of the tunnel is completed, before pouring lining concrete above the waist of the tunnel, dismantling a Y-shaped three-way pipe on a conveying pump pipe, then connecting a soft rubber pipe and a check valve, conveying the concrete to a warehouse entry port at the top of the tunnel, pouring lining concrete above the waist of the tunnel, arranging an observation pipe on a vault of a lining template of the tunnel, when the observation pipe has concrete flowing out, indicating that a vault lining space is filled fully, closing the check valve, and then dismantling the soft rubber pipe.
And fifthly, after the pouring of the lining concrete of the tunnel is completed, cleaning the concrete pump pipe.
Wherein, the template trolley in the first step is provided with a concrete pump, a material distributing and warehousing device and an attached template vibrator.
And after concrete is poured for about 1 day (18-36 h), demolding the needle beam steel mould trolley, and spraying/spray curing the tunnel lining concrete by a spray curing trolley or a fog gun machine.
The concrete has the advantages of low early hydration heat, high strength and good durability, and the construction method can be matched with the concrete in engineering, so that the concrete not only can meet the engineering construction requirements, but also can ensure the engineering quality and save the construction cost.
Compared with the prior art, the application has the beneficial effects that:
(1) The invention is unexpectedly found that 15% of fly ash is simultaneously doped in the implementation process, so that the filling effect and the secondary hydration effect are realized in the concrete, the porosity of the concrete can be reduced, the pore structure is improved, the compactness of the concrete is effectively improved, the cement consumption is reduced, and the adiabatic temperature rise of early concrete is reduced.
(2) In the implementation process, the invention unexpectedly discovers that the increase of the specific surface area of the slag powder can increase the early self-shrinkage of the concrete, and the adoption of the slag powder with different specific surface areas as the admixture of the prestressed lining concrete can better improve the compactness of the concrete. The mass ratio of the slag powder with two different specific surface areas is controlled to be 0.3-3:0.3-3, and the slag powder combination with different specific surface areas has a certain promotion effect on reducing early-stage adiabatic temperature rise, thereby being beneficial to reducing early-stage hydration heat of concrete and fully utilizing the later-stage strength of mineral admixture.
(3) In the implementation process, the superplasticizer and the retarder are added into the concrete as additives for improving the flow property, the setting time, the mechanical property and the durability of the concrete. Meanwhile, the mass ratio of the superplasticizer to the retarder is further controlled to be 5-10:0.2-1, the fluidity of the concrete can be improved, the setting time is prolonged, the working performance of the concrete is improved, the obtained concrete can be just applied to tunnel linings, and the prestressed lining concrete which has excellent mechanical properties and durability and thermal insulation temperature rise and meets engineering design requirements and temperature control and anti-cracking requirements is prepared by the raw material components.
(4) The invention surprisingly discovers that controlling the mass ratio of water to the total amount of cement, fly ash and slag powder to be 0.35:1 in the implementation process can ensure the working fluidity in the concrete preparation process and also can ensure the mechanical property and durability of the concrete.
(5) The concrete has the advantages of low early hydration heat, high strength and good durability, and the construction method can be matched with the concrete in engineering, so that the concrete not only can meet the engineering construction requirements, but also can ensure the engineering quality and save the construction cost.
Detailed Description
The present invention will be described in further detail in order to make the objects, technical solutions and advantages of the present invention more apparent. The description herein is only intended to illustrate the invention and not to limit the invention, as far as the specific examples are concerned.
The present invention will be described in further detail with reference to specific examples.
Basic examples: construction method for applying concrete to deep-buried long tunnel lining
The method comprises the following steps:
Firstly, installing a steel bar, a steel strand, an anchor groove and a water stop copper sheet by using a steel bar trolley, shifting the steel bar trolley after the installation, shifting the needle beam steel mould trolley into position, and plugging and reinforcing an end template;
Step two, transporting the concrete prepared by the method to a tunnel working well (vertical shaft) by adopting a stirring transport vehicle, sliding the concrete to the bottom of the vertical shaft by utilizing an anti-separation chute arranged in the vertical shaft, transporting the concrete to a pouring working surface by using the concrete transport vehicle, and pouring by using a template trolley;
Step three, when pouring lining concrete below the waist of the tunnel, the concrete pump simultaneously conveys the concrete to the inlets at two sides of the waist of the tunnel through a conveying pump pipe, a Y-shaped three-way pipe and a soft rubber pipe, synchronously and uniformly pouring the lining concrete below the waist, and after the concrete pump is conveyed into the bins, vibrating the lining concrete through an attached vibrator, and adopting an inserted vibrator to vibrate the joint pouring window to ensure that pouring is compact;
And fourthly, after pouring concrete below the waist of the tunnel is completed, before pouring lining concrete above the waist of the tunnel, dismantling a Y-shaped three-way pipe on a conveying pump pipe, then connecting a soft rubber pipe and a check valve, conveying the concrete to a warehouse entry port at the top of the tunnel, pouring lining concrete above the waist of the tunnel, arranging an observation pipe on a vault of a lining template of the tunnel, when the observation pipe has concrete flowing out, indicating that a vault lining space is filled fully, closing the check valve, and then dismantling the soft rubber pipe.
And fifthly, after the pouring of the lining concrete of the tunnel is completed, cleaning the concrete pump pipe.
Wherein, the template trolley in the first step is provided with a concrete pump, a material distributing and warehousing device and an attached template vibrator.
And after concrete is poured for about 1 day (18-36 h), demolding the needle beam steel mould trolley, and spraying/spray curing the tunnel lining concrete by a spray curing trolley or a fog gun machine.
Example 1 prestressed lining concrete and method for producing the same
The prestressed lining concrete comprises the following components in parts by weight:
253 parts of cement, 69 parts of fly ash, 138 parts of slag powder, 770 parts of sand, 1024 parts of crushed stone, 161 parts of water, 8.3 parts of superplasticizer and 0.92 part of retarder.
The slag powder is a mixture of slag powder A with the specific surface area of 550m 2/kg and slag powder B with the specific surface area of 450m 2/kg, and the mass ratio of the slag powder A with the specific surface area of 550m 2/kg to the slag powder B with the specific surface area of 450m 2/kg is 5:1;
The specific surface area of the slag powder is more than or equal to 400m 2/kg;
the superplasticizer is a polycarboxylic acid high-performance water reducer (Shanxigrette 005);
the retarder is a mixture of sodium lignin sulfonate, tartaric acid and sodium gluconate in a mass ratio of 1:1:1;
The preparation method comprises the following steps:
S1, uniformly mixing sand and broken stone to obtain a mixture C;
s2, uniformly mixing cement, fly ash and slag powder to obtain a mixture D;
And S3, mixing the mixture C and the mixture D, adding water, superplasticizer and retarder, and stirring and mixing until the mixture is uniform paste, thus obtaining the prestressed lining concrete.
Example 2 prestressed lining concrete and method for producing the same
The prestressed lining concrete comprises the following components in parts by weight:
253 parts of cement, 69 parts of fly ash, 138 parts of slag powder, 770 parts of sand, 1024 parts of crushed stone, 161 parts of water, 8.3 parts of superplasticizer and 0.92 part of retarder.
The slag powder is a mixture of slag powder A with the specific surface area of 550m 2/kg and slag powder B with the specific surface area of 450m 2/kg, and the mass ratio of the slag powder A with the specific surface area of 550m 2/kg to the slag powder B with the specific surface area of 450m 2/kg is 2:1;
The specific surface area of the slag powder is more than or equal to 400m 2/kg;
the superplasticizer is a polycarboxylic acid high-performance water reducer (Shanxigrette 005);
the retarder is a mixture of sodium lignin sulfonate, tartaric acid and sodium gluconate in a mass ratio of 1.5:1:1.5;
The preparation method comprises the following steps:
S1, uniformly mixing sand and broken stone to obtain a mixture C;
s2, uniformly mixing cement, fly ash and slag powder to obtain a mixture D;
And S3, mixing the mixture C and the mixture D, adding water, superplasticizer and retarder, and stirring and mixing until the mixture is uniform paste, thus obtaining the prestressed lining concrete.
Example 3 prestressed lining concrete and method for producing the same
The prestressed lining concrete comprises the following components in parts by weight:
253 parts of cement, 69 parts of fly ash, 138 parts of slag powder, 770 parts of sand, 1024 parts of crushed stone, 161 parts of water, 8.3 parts of superplasticizer and 0.92 part of retarder.
The slag powder is a mixture of slag powder A with the specific surface area of 550m 2/kg and slag powder B with the specific surface area of 450m 2/kg, and the mass ratio of the slag powder A with the specific surface area of 550m 2/kg to the slag powder B with the specific surface area of 450m 2/kg is 1:1;
The specific surface area of the slag powder is more than or equal to 400m 2/kg;
the superplasticizer is a polycarboxylic acid high-performance water reducer (Shanxigrette 005);
the retarder is a mixture of sodium lignin sulfonate, tartaric acid and sodium gluconate in a mass ratio of 1:1:1;
The preparation method comprises the following steps:
S1, uniformly mixing sand and broken stone to obtain a mixture C;
s2, uniformly mixing cement, fly ash and slag powder to obtain a mixture D;
And S3, mixing the mixture C and the mixture D, adding water, superplasticizer and retarder, and stirring and mixing until the mixture is uniform paste, thus obtaining the prestressed lining concrete.
Example 4 prestressed lining concrete and method for producing the same
The prestressed lining concrete comprises the following components in parts by weight:
253 parts of cement, 69 parts of fly ash, 138 parts of slag powder, 770 parts of sand, 1024 parts of crushed stone, 161 parts of water, 8.3 parts of superplasticizer and 0.92 part of retarder.
The slag powder is a mixture of slag powder A with the specific surface area of 550m 2/kg and slag powder B with the specific surface area of 450m 2/kg, and the mass ratio of the slag powder A with the specific surface area of 550m 2/kg to the slag powder B with the specific surface area of 450m 2/kg is 1:2;
The specific surface area of the slag powder is more than or equal to 400m 2/kg;
the superplasticizer is a polycarboxylic acid high-performance water reducer (Shanxigrette 005);
the retarder is a mixture of sodium lignin sulfonate, tartaric acid and sodium gluconate in a mass ratio of 1:1:1;
The preparation method comprises the following steps:
S1, uniformly mixing sand and broken stone to obtain a mixture C;
s2, uniformly mixing cement, fly ash and slag powder to obtain a mixture D;
And S3, mixing the mixture C and the mixture D, adding water, superplasticizer and retarder, and stirring and mixing until the mixture is uniform paste, thus obtaining the prestressed lining concrete.
Example 5 prestressed lining concrete and method for producing the same
The prestressed lining concrete comprises the following components in parts by weight:
253 parts of cement, 69 parts of fly ash, 138 parts of slag powder, 770 parts of sand, 1024 parts of crushed stone, 161 parts of water, 8.3 parts of superplasticizer and 0.92 part of retarder.
The slag powder is a mixture of slag powder A with the specific surface area of 550m 2/kg and slag powder B with the specific surface area of 450m 2/kg, and the mass ratio of the slag powder A with the specific surface area of 550m 2/kg to the slag powder B with the specific surface area of 450m 2/kg is 1:5;
The specific surface area of the slag powder is more than or equal to 400m 2/kg;
the superplasticizer is a polycarboxylic acid high-performance water reducer (Shanxigrette 005);
the retarder is a mixture of sodium lignin sulfonate, tartaric acid and sodium gluconate in a mass ratio of 1:1:1;
The preparation method comprises the following steps:
S1, uniformly mixing sand and broken stone to obtain a mixture C;
s2, uniformly mixing cement, fly ash and slag powder to obtain a mixture D;
And S3, mixing the mixture C and the mixture D, adding water, superplasticizer and retarder, and stirring and mixing until the mixture is uniform paste, thus obtaining the prestressed lining concrete.
Comparative example 1
The difference from example 4 is that: the cement was used in an amount of 460 parts, and the fly ash was not blended, the slag powder was not blended, and other components and contents were the same as those in example 4, and the preparation method was the same as that in example 4.
Comparative example 2
The difference from example 4 is that: the cement was used in an amount of 391 parts, without slag powder, and other components and contents were the same as in example 4, and the preparation method was the same as in example 4.
Comparative example 3
The difference from example 4 is that: the slag powder A was the same as that of example 4 except that the slag powder A had a specific surface area of 550m 2/kg and the other components and contents were the same as those of example 4.
Comparative example 4
The difference from example 4 is that: the slag powder B was the same as example 4 except that the slag powder B had a specific surface area of 450m 2/kg and the other components and contents were the same as those of example 4.
Comparative example 5
The difference from example 4 is that: the retarder is sodium lignin sulfonate, tartaric acid with the mass ratio of 1:1, other components and the content are the same as those in the example 4, and the preparation method is the same as that in the example 4.
Comparative example 6
The difference from example 4 is that: 6 parts of superplasticizer and 3.22 parts of retarder. Other components and contents were the same as in example 4, and the preparation method was the same as in example 4.
Examples and comparative examples consist of (wherein the water reducing agent comprises superplasticizer and retarder):
performance testing
1. Slump: the test method comprises the following steps: hydraulic concrete test procedure SL/T352-2020 (4.2 concrete mixture slump test);
2. diffusion degree: the test method comprises the following steps: "Hydraulic concrete test protocol" SL/T352-2020 (4.4 concrete mixture diffusivity test);
3. compressive strength: the test method comprises the following steps: hydraulic concrete test procedure SL/T352-2020 (5.1 concrete cube compressive Strength test);
4. split tensile strength: the test method comprises the following steps: hydraulic concrete test procedure SL/T352-2020 (5.3 concrete split tensile Strength test);
5. Modulus of static pressure elasticity: the test method comprises the following steps: "Hydraulic concrete test procedure" SL/T352-2020 (5.8 concrete axial compressive Strength and static compression elastic modulus test);
6. barrier grade: the test method comprises the following steps: "Hydraulic concrete test procedure" SL/T352-2020 (5.22 concrete impermeability test-progressive pressurization method);
7. Freeze rating: the test method comprises the following steps: "Hydraulic concrete test protocol" SL/T352-2020 (5.24 concrete antifreeze test-quick freezing method);
8. Diffusion coefficient of chloride ion: the test method comprises the following steps: "Hydraulic concrete test procedure" SL/T352-2020 (5.30 concrete chloride ion diffusion coefficient test-RCK method);
9. Thermal properties: the test method comprises the following steps: hydraulic concrete test procedure SL/T352-2020 (5.19 concrete adiabatic temperature rise test).
The results were as follows:
the mixing proportion of the concrete meets the requirement of pumping construction working performance. From the performance point of view, the compressive strength of example 3 (15% of fly ash, 15% of slag powder (A10% + B20%) is not greatly different from that of comparative example 1 without admixture and comparative examples 2 and 28d with 15% of single fly ash, because the best combination of fly ash and fine particles of two kinds of slag powder (A+B) with different specific surface areas can fully fill part of the pores in a cement and aggregate stacking system, and meanwhile, the activated silica and alumina in the fly ash and slag powder react with calcium silicate, calcium hydroxide and the like in cement hydration products to generate calcium silicate, calcium sulfoaluminate and the like, and further fill the pores remained in concrete to increase compactness and improve pore structure.
When the temperature stress is obviously smaller than the tensile strength of the age, the probability of generating temperature cracks of the concrete is smaller. Such as: comprehensively adopting engineering measures of controlling the concrete pouring temperature to be less than 27 ℃ and carrying out water spraying curing for not less than 28 days (the curing water temperature is controlled in a stepwise manner at 40-32 ℃), plugging hand holes below the waist line of a tunnel, laying geotechnical cloth, reducing constraint and the like, wherein the 28d tensile strength of the embodiment 4 is 3.98MPa, the maximum tensile stress is 3.13MPa (the curing water at 30 ℃), the cracking resistance coefficient is 1.272, and the cracking resistance coefficient is more than 1.0 and the early cracking risk is lower.
The concrete of example 4, which has a remarkable excellent micro aggregate effect compared with other combinations, has a 28d chloride ion diffusion coefficient (x 10 -12m2/s) of 3.5 compared with the combination of slag powder (A10%) with different specific surface areas, shows that the combination of slag powder (A10%) and B20%) is optimal, the internal void structure of the concrete is improved most effectively, the void ratio is reduced, the concrete is made more compact, the chloride ion diffusion coefficient is reduced, and the improvement of the impermeability of the concrete can be embodied from the side.
Comparison of example 4 with comparative examples 3 and 4 shows that selecting two fine particles of slag powder (a+b) of different specific surface areas has a remarkable improvement effect on physical properties. Example 4 is compared with comparative examples 5 and 6 to demonstrate that the selection of a particular water reducing agent can further improve concrete performance.
Examples 1-5 under the precondition that the mixing amount of the fly ash is 15%, the mass ratio of the mixed slag powder A to the slag powder B is 5-1:1-5, wherein the adiabatic temperature rise of the concrete is reduced to different degrees along with the mixing amount of the two different specific surface area combinations, and the adiabatic temperature rise of the concrete in the age of 1d-10d in the embodiment 4 is the lowest;
Example 4 the adiabatic temperature rise test values at ages 1d, 3d, 7d, 28d of the corresponding concrete of comparative example 1 (no admixture) were reduced by 30.4 ℃, 11.0 ℃, 11.7 ℃, 12.4 ℃; the cracking risk of the concrete is greatly reduced. Example 4 compared with comparative example 2 (15% of fly ash single) the adiabatic temperature rise test values of the corresponding concrete 1d, 3d, 7d and 28d ages are reduced by 5.8 ℃, 6.1 ℃, 5.1 ℃ and 4.8 ℃; the cracking risk of the concrete is greatly reduced. Also, example 4 reduced the adiabatic temperature rise test value to a different extent than comparative examples 3 to 6.
In summary, in examples 1-5, example 4 showed the lowest adiabatic temperature rise of the concrete at the age of 1d-10d, indicating 1 for slag powder A and slag powder B: 2, the combination is optimal, and the diffusion coefficient of chloride ions is obviously reduced. In the method, various indexes such as the design age, physical property, mechanical property, durability, adiabatic temperature rise and the like of the concrete are comprehensively considered, and the embodiment 4 is the optimal embodiment.

Claims (9)

1. The prestressed lining concrete is characterized in that: the coating comprises the following components in parts by weight:
230-260 parts of cement, 50-80 parts of fly ash, 120-150 parts of slag powder, 700-800 parts of sand, 1000-1100 parts of crushed stone, 150-170 parts of water, 6-10 parts of superplasticizer and 0.5-1.5 parts of retarder;
the slag powder is a mixture of slag powder A with the specific surface area of 550m2/kg and slag powder B with the specific surface area of 450m 2/kg; the mass ratio of the slag powder A to the slag powder B is 5-1:1-5; the retarder is a mixture of sodium lignin sulfonate, tartaric acid and sodium gluconate in a mass ratio of 1-2:1:1-2; the mass ratio of the superplasticizer to the retarder is 5-10:0.2-1.
2. The prestressed lined concrete of claim 1, wherein: the coating comprises the following components in parts by weight:
253 parts of cement, 69 parts of fly ash, 138 parts of slag powder, 770 parts of sand, 1024 parts of crushed stone, 161 parts of water, 8.3 parts of superplasticizer and 0.92 part of retarder.
3. The prestressed lined concrete of claim 1, wherein: the mass ratio of the slag powder A to the slag powder B is 1:1.
4. The prestressed lined concrete of claim 1, wherein: the superplasticizer is a polycarboxylic acid high-performance water reducer.
5. The prestressed lined concrete of claim 1, wherein: the retarder is a mixture of sodium lignin sulfonate, tartaric acid and sodium gluconate in a mass ratio of 1:1:1.
6. The prestressed lined concrete of claim 1, wherein: the mass ratio of the water to the total amount of the cement, the fly ash and the slag powder is 0.35:1.
7. The method for preparing the prestressed lining concrete according to any one of claims 1 to 6, wherein: the method comprises the following steps:
S1, uniformly mixing sand and broken stone to obtain a mixture C;
S2, uniformly mixing cement, fly ash and slag powder to obtain a mixture D;
And S3, mixing the mixture C and the mixture D, adding water, superplasticizer and retarder, and stirring and mixing until the mixture is uniform paste, thus obtaining the prestressed lining concrete.
8. Use of the prestressed lining concrete according to any of claims 1-6 in deep buried long tunnel liners.
9. The construction method of applying the prestressed lining concrete to the deep-buried long tunnel lining according to any one of claims 1 to 6, wherein: the method comprises the following steps:
Firstly, installing a steel bar, a steel strand, an anchor groove and a water stop copper sheet by using a steel bar trolley, shifting the steel bar trolley after the installation, shifting the needle beam steel mould trolley into position, and plugging and reinforcing an end template;
Step two, transporting the prestressed lining concrete according to any one of claims 1-6 to a tunnel working well by adopting a stirring transport vehicle, sliding the concrete to the bottom of a vertical shaft by utilizing an anti-separation chute arranged in the working well, transporting the concrete to a pouring working surface by the concrete transport vehicle, and pouring by a template trolley;
Step three, when pouring lining concrete below the waist of the tunnel, the concrete pump simultaneously conveys the concrete to the inlets at two sides of the waist of the tunnel through a conveying pump pipe, a Y-shaped three-way pipe and a soft rubber pipe, synchronously and uniformly pouring the lining concrete below the waist, and after the concrete pump is conveyed into the bins, vibrating the lining concrete through an attached vibrator, and adopting an inserted vibrator to vibrate the joint pouring window to ensure that pouring is compact;
After pouring concrete below the waist of the tunnel is completed, before pouring lining concrete above the waist of the tunnel, dismantling a Y-shaped three-way pipe on a conveying pump pipe, then connecting a soft rubber pipe and a check valve, conveying the concrete to a warehouse entry port at the top of the tunnel, pouring the lining concrete above the waist of the tunnel, arranging an observation pipe on a vault of a lining template of the tunnel, when the observation pipe has concrete flowing out, indicating that the vault lining space is filled fully, closing the check valve, and then dismantling the soft rubber pipe;
Step five, after the pouring of the lining concrete of the tunnel is completed, cleaning a concrete pump pipe;
Wherein, the template trolley in the second step is provided with a concrete pump, a material distributing and warehousing device and an attached template vibrator.
CN202310805222.XA 2023-07-03 2023-07-03 Prestressed lining concrete and preparation method and construction method thereof Active CN117069424B (en)

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CN102432245A (en) * 2011-08-29 2012-05-02 冯乃谦 Method for making concrete for manufacturing pre-stress pipe piles
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