CN100506737C - Low shrinken, fireproof, high leakage resisted material of duct piece for shield tunnel, and preparation method - Google Patents

Low shrinken, fireproof, high leakage resisted material of duct piece for shield tunnel, and preparation method Download PDF

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CN100506737C
CN100506737C CNB2006101255910A CN200610125591A CN100506737C CN 100506737 C CN100506737 C CN 100506737C CN B2006101255910 A CNB2006101255910 A CN B2006101255910A CN 200610125591 A CN200610125591 A CN 200610125591A CN 100506737 C CN100506737 C CN 100506737C
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water
cement
humidity compensate
fiber
swelling agent
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CN101003428A (en
Inventor
胡曙光
丁庆军
曾波
马保国
彭波
谢先启
邓立明
王发洲
吕林女
何永佳
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Wuhan Municipal Construction Group Co Ltd
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Wuhan University of Technology WUT
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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
    • 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
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/027—Lightweight 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/06—Inhibiting the setting, e.g. mortars of the deferred action type containing water in breakable containers ; Inhibiting the action of active ingredients
    • C04B40/0633—Chemical separation of ingredients, e.g. slowly soluble activator
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
    • 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
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • 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

Abstract

This invention relates to a method for preparing ireproof shield tunnel segment material with low shrinkage and high impermeability. The material is prepared from: cement 360-400kg/m3, fly ashes 80-120 kg/m3, fine aggregate 690-720kg/m3, coarse aggregate 1100-1180 kg/m3, humidity supplementary medium 50-150 kg/m3, fibers 0.8-2 kg/m3, expanding agent 20-30 kg/m3, water (the water/colloid is 0.29-0.32), and high-performance naphthalene-based water reducer (the amount is 1.3-1.6 wt.%). The material has such advantages as good durability, high size stability, and good fireproof performance.

Description

A kind of low contraction high impervious shield tunnel sheet material and preparation method thereof of preventing fires
Technical field
The present invention relates to a kind of high-performance shield tunnel lining segment material and preparation method thereof.
Background technology
Along with the continuous development of Chinese Development of China's Urbanization, urban population must get more and more, and urban land is used fewer and fewer.Be to alleviate pressing for of urban development, the large-scale development of urban underground space has been become inexorable trend.Following many decades, the infrastructure construction of China are with the construction of more concern in underground installation, and tunnel over strait, river and urban track traffic will become the emphasis of construction more, and the most general a kind of method in front of tunnel construction is exactly a shield method.In shielding method, by some prefabricated pipe sections or the assembled tunnel lining structure body of building block, the strength and stiffness requirement of engineering structure must be satisfied in the section of jurisdiction, satisfy the safe mass index request that engineering proposes, this makes that the design of tunnel lining structure is quite complicated, and is extremely important thereby the selection of lining material just seems.In shield tunnel, the section of jurisdiction is the permanent lining, secondary lining structure of shield tunnel, and the quality of section of jurisdiction performance will be directly connected to the quality of whole Tunnel Engineering construction and the service life in tunnel.Be necessary the work-ing life of therefore improving shield tunnel lining segment.
The work-ing life of section of jurisdiction is relevant with the weather resistance of section of jurisdiction concrete material, and the weather resistance of section of jurisdiction material then mainly embodies material on waterproof, impervious performance.Tunnel water proofing is except the waterproof of tunnel duct piece self, also comprise seam waterproof between section of jurisdiction and the section of jurisdiction, all reach the purpose of waterproof during section of jurisdiction assembling now by the elastic sealing gasket that the hydro-expansive rubber preparation is installed at seam crossing, be further noted that the retractable property of concrete pipe sheet self simultaneously, therefore how to guarantee concrete volume stability for a long time, the dimensional precision that promptly guarantees concrete pipe sheet also is an important factor.On the impervious performance that then is embodied in concrete anti-water infiltration, chloride-penetration resistance, the impervious index of section of jurisdiction is about P12 both at home and abroad at present, and the resisting chloride ion penetration spread coefficient is in 2-4 * 10 -12m 2/ s, the life-span by estimating this section of jurisdiction, the section of jurisdiction was shorter concrete work-ing life, influences the work-ing life of tunnel integral body about 50 years, needed to improve the concrete resistance of chloride ion penetration energy in section of jurisdiction.The fire resistance of tunnel duct piece material also has very big influence for the operation life-span in whole tunnel, though the shield structure lining segment as main building in the shield tunnel is a non-combustible material, but in the short period of time that fire takes place, the on-the-spot local temperature of catching fire in the tunnel can rise to 1000 ℃ rapidly, raise with temperature, the reinforced concrete member mechanical property sharply reduces, directly influence the supporting capacity of member and the stability of buildings, can occur in explosion, the lining reinforcing bar when serious and destroy and lose anchorage force and cause the tunnel to collapse, cause serious consequence.
Therefore, in the process of preparation concrete pipe sheet material, improve concrete long durability energy, long-term volume stability, fire resistance and just seem particularly important.
Summary of the invention
The object of the present invention is to provide a kind of endurance quality, volume stability, low contraction that fire resistance the is good high impervious shield tunnel sheet material and preparation method thereof of preventing fires.
To achieve these goals, technical scheme of the present invention be adopt one of following two kinds:
1, a kind of low contraction high impervious shield tunnel sheet material of preventing fires, it is characterized in that it is mainly formed fully by cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer mixed raw material, each raw material weight proportioning is: cement 360-400kg/m 3, flyash 80-120kg/m 3, fine aggregate 690-720kg/m 3, coarse aggregate 1100-1180kg/m 3, humidity compensate medium 50-150kg/m 3, fiber 0.8-2kg/m 3, swelling agent 20-30kg/m 3, the volume of water is pressed water-cement ratio 0.29-0.32, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.3-1.6%;
Wherein the humidity compensate medium is to adopt silica-aluminum materials and foaming ingredient coke powder through 1150～1200 ℃ of high-temperature roasting 20～30min, and the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17～0.25; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa.
Above-mentioned a kind of low contraction high impervious duct pieces of shield tunnel preparation methods of preventing fires is characterized in that it comprises the steps:
1), the preparation of humidity compensate medium: adopt silica-aluminum materials and foaming ingredient coke powder through 1150～1200 ℃ of high-temperature roasting 20～30min, the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17～0.25; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa;
2), be: cement 360-400kg/m by each raw material weight proportioning 3, flyash 80-120kg/m 3, fine aggregate 690-720kg/m 3, coarse aggregate 1100-1180kg/m 3, humidity compensate medium 50-150kg/m 3, fiber 0.8-2kg/m 3, swelling agent 20-30kg/m 3Choose cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, 0.29-0.32 chooses water by water-cement ratio, and the efficient naphthalene water reducer of mixing outward is that 1.3-1.6% chooses by mixing quality;
3), place water fully wetting in the humidity compensate medium before the stirring; Cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer raw material are stirred moulding according to normal concrete formation program; be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
2, a kind of low contraction high impervious shield tunnel sheet material of preventing fires, it is characterized in that it is mainly formed fully by cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer mixed raw material, each raw material weight proportioning is: cement 330-360kg/m 3, breeze 100-130kg/m 3, fine aggregate 690-720kg/m 3, coarse aggregate 1100-1180kg/m 3, humidity compensate medium 50-150kg/m 3, fiber 0.8-2kg/m 3, swelling agent 20-30kg/m 3, the volume of water is pressed water-cement ratio 0.29-0.32, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.4-1.6%;
Wherein the humidity compensate medium is to adopt silica-aluminum materials and foaming ingredient coke powder through 1150～1200 ℃ of high-temperature roasting 20～30min, and the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17～0.25; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa.
Above-mentioned a kind of low contraction high impervious duct pieces of shield tunnel preparation methods of preventing fires is characterized in that it comprises the steps:
1), the preparation of humidity compensate medium: adopt silica-aluminum materials and foaming ingredient coke powder through 1150～1200 ℃ of high-temperature roasting 20～30min, the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17～0.25; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%: 3. cylindrical compress strength is more than the 6.5Mpa;
2), be: cement 330-360kg/m by each raw material weight proportioning 3, breeze 100-130kg/m 3, fine aggregate 690-720kg/m 3, coarse aggregate 1100-1180kg/m 3, humidity compensate medium 50-150kg/m 3, fiber 0.8-2kg/m 3, swelling agent 20-30kg/m 3Choose cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, 0.29-0.32 chooses water by water-cement ratio, and the efficient naphthalene water reducer of mixing outward is that 1.4-1.6% chooses by mixing quality;
3), place water fully wetting in the humidity compensate medium before the stirring; Cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer raw material are stirred moulding according to normal concrete formation program; be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
Described cement is the 42.5R ordinary Portland cement.
Described flyash is I level flyash, and density is 2.7g/cm 3
Described breeze is that specific surface area is greater than 500m 2/ kg, density 2.8g/cm 3
Described fine aggregate is a river sand, and fineness modulus is 2.5-2.8.
Described coarse aggregate is a 5-25 continuous grading rubble, crush values＜10%.
Described fiber is a porous polypropylene nitrile fiber, and proportion 0.91, tensile strength 620-785MPa, Young's modulus is greater than 3500MPa, elongation at break 8%.
Described swelling agent is a UEA type low-alkali high-efficiency cement expansive material, and relative density is 2.85, specific surface area 300～350m 2/ kg.
Described silica-aluminum materials is that mud, aluminium content are the mixing of any one or two kinds in the II level flyash more than 30%, mud and aluminium content are the II level flyash more than 30% when mixing, and aluminium content is that the II level flyash more than 30% accounts for mud and aluminium content is the 20-30% of the II level flyash quality more than 30%; Perhaps mud mixes with kaolinic, and kaolin accounts for the 20-30% of mud and kaolin quality.
The concrete consumption of described humidity compensate medium determines that by formula equal-volume replaces coarse aggregate then, and concrete formula is as follows:
m = C f · CS · α max S
C f-folk prescription concrete cement consumption, units/m 3
CS-required the amount of extra water of unit mass hydrated cementitious generally gets 0.06kg/kg cement;
α Max-concrete maximum possible degree of hydration (water-cement ratio/0.36);
The water-intake rate of S-humidity compensate material, the % of unit;
The volume of m-humidity compensate material, units/m 3
The present invention is by introducing the humidity compensate medium in concrete pipe sheet material commonly used, this is a kind of a kind of porous material that adopts silica-aluminum materials through high-temperature roasting, foaming preparation, there is the higher sial glazing layer of one deck intensity on the surface, can combine with the hydrated cementitious product is fine, gather materials and the hydrated cementitious product between produce good transition layer, gather materials and the interface weak area of slurry by improvement.Introduce the humidity compensate medium, can be when concrete produces the self-desiccation phenomenon and the self-constriction tendency is arranged, between the internal void of humidity compensate medium and concrete pore, produced pressure difference, moisture flows to cement stone by humidity compensate medium inside under the pressure difference effect, suppress the generation of self-constriction.The swelling agent that can utilize the water that stores in the humidity compensate dielectric material and the present invention to mix in the later stage reacts, make concrete produce microdilatancy, reduce concrete because the cubic deformation that drying shrinkage causes guarantees the long-term volume stability of concrete material and the precision of section of jurisdiction.When the tunnel is attacked by fire, because the water cement ratio of high performance concrete is all smaller, the structure denser, the water vapour of generation moves nowhere and discharges, and causes certain pressure at inside concrete, easily cause concrete destruction, utilize the porous feature of this humidity compensate medium, can allow the water vapour of these volumetric expansions be released and move, reduce internal pressure, alleviation is to the destruction of concrete structure, and fire resistance is good.And when the volume that gathers materials being expanded, can utilize the porous feature of this humidity compensate dielectric material when inside concrete generation alkali, alleviate because the destruction that the volumetric expansion of gathering materials causes concrete is improved concrete weather resistance.The present invention has also mixed a certain amount of polyacrylonitrile multiporous fiber at concrete, the fine arrangement of reinforcement effect that utilizes these homodisperse fibers in concrete, to play, improve concrete cracking resistance, anti-permeability performance, when the tunnel meets with fire, these fibers stay the passage that some communicate with one another later at high temperature evaporation, and the humidity compensate medium that adopts with the present invention discharges the water vapour that Yin Gaowen produces, and alleviates internal gas pressure, reduce the possibility of material explosion, improve fire resistance.A kind of low contraction of the present invention is prevented fires after high impervious shield tunnel sheet material is applied to shield structure lining segment and produces, and can improve the long durability energy of section of jurisdiction, long-term volume stability and fire resistance greatly.
The present invention uses the mineral admixture of big volume in the concrete pipe sheet material, can reduce the temperature rise of inside concrete aquation, reduces the crack that thermal stress causes; Reduce the Ca (OH) of inside concrete interfacial transition zone 2Content improves interfacial transition zone, improves concrete impervious corrosion resisting property.
The humidity compensate dielectric material that the present invention adopts is to adopt silica-aluminum materials through high-temperature roasting, a kind of porous structure material of foaming preparation, has intensity, pore structure, the characteristics of water-intake rate designability, and the starting material source is wide, cost is low, it is comparatively ideal humidity compensate dielectric material of a class, adopt this kind humidity compensate dielectric material that concrete is mainly contained two aspect effects, the one, as a kind of humidity compensate medium, the 2nd, help the raising of the fire resistance of concrete pipe sheet, the introducing of humidity compensate dielectric material can also make concrete overall performance be optimized, the 3rd, the humidity compensate dielectric material provides the energy Free up Memory because of the endure cold differential expansion that produces or cause because of alkali that freezes of its moisture content for concrete, thereby can improve concrete weather resistance.
As follows as the concrete mechanism of humidity compensate medium: the humidity compensate medium discharges moisture and plays the humidity compensate effect in inside concrete humidity reduction process.The humidity compensate medium is released water in concrete power has two, and the one, cement stone and humidity compensate medium internal capillaries pressure difference.Because the generation of concrete self-desiccation phenomenon has produced pressure difference between the internal void of concrete pore and humidity compensate medium, moisture flows to cement stone by humidity compensate medium inside under the pressure difference effect; The 2nd, humidity compensate medium and cement stone pore humidity inside are poor.According to Fick's first law, the internal moisture of humidity compensate medium is directly proportional to the flow of cement stone diffusion moisture gradient big or small and between the two under psychrometric difference drives.Moisture gradient is big more, and diffusion flow is big more, and the humidity compensate action effect of humidity compensate medium is remarkable more.
Release the water initial stage at the humidity compensate medium, along with the decline of cement stone interior humidity, the psychrometric difference between cement stone interior humidity and the humidity compensate medium is the major impetus that the humidity compensate medium is released water.Releasing the water later stage, along with the hydrated cementitious hardened carries out, the inner capillary dimensions of cement stone diminishes gradually because of the filling of hydrated cementitious product, the reducing and can increase the kapillary tensile stress of capillary dimensions, the kapillary tensile stress becomes the major impetus that the humidity compensate medium is released water gradually in this process.
The water-cement ratio that high performance concrete adopts is generally all smaller, the cement slurry internal relative humidity descends very fast with the growth in the length of time under the air tight condition, the moisture that contains some amount through the porous aggregate of pre-wet treatment, reduction along with the cement slurry internal relative humidity, moisture in the porous aggregate will disengage and be replenished, and plays the effect that reduces and postpone self-desiccation.It is high more to introduce the water yield, and porous aggregate provides the time length of moisture long more, and the effect that reduces self-desiccation is obvious more, and the effect that reduces the concrete self-constriction is just obvious more, helps concrete long-term volume stability.
Adopt this kind humidity compensate dielectric material also to help the raising of the fire resistance of tunnel duct piece material, present concrete pipe sheet mostly adopts high-performance concrete material, itself has higher degree of compactness, be subjected under the fiery contour tender feeling shape, the residual water-content of the pore inside of inside concrete is subjected to thermal evaporation, volumetric expansion, but because inside concrete denser, the gas of volumetric expansion is moved nowhere and discharge, inside concrete is caused certain interior pressure, after this accumulation of pressure arrives to a certain degree, can cause the explosion of concrete material, concrete structure is destroyed.After adopting this humidity compensate dielectric material, take place, when temperature raises at fire, the water vapour that produces can obtain migration from the micropore the humidity compensate material and discharge, thereby reduce the pressure of inside concrete, reduce the possibility of concrete explosion, improve concrete fire resistance.
Among the present invention admixture a kind of polyacrylonitrile fibre with porous feature, help the raising of concrete resistance to cleavage, anti-permeability performance and fire resistance, after in concrete, mixing fiber, cement slurry is as the gelling material of aggregates such as sand, stone, bonded a large amount of microfibres simultaneously, these homodisperse fiber phase lap connection, become the network of omnidirectional distribution, play the support aggregate, thereby reduce the segregation of aggregate effectively, reduce bleeding, improved concrete cohesiveness and water-retentivity, reduced the sedimentation contraction.In the concrete coagulation process of setting, fiber plays a part fine arrangement of reinforcement, avoids running through the formation that is communicated with pore, has suppressed concrete cracking effectively, has improved concrete tensile strength simultaneously to a certain extent.Even the microfracture after condensing is under inside or external stress effect, its expansion also must be subjected to stopping of fine and close network that fiber constituted in matrix inside, is difficult to be extended to the crack, thereby has reached the purpose of anti-crack and anti-seepage effectively.Simultaneously when meeting with fire, after temperature raise, fiber fusing back formed the passage that communicates with one another, and was moved and discharged with the elevate the temperature water vapor that produces of the hole of humidity compensate dielectric material, reduce inside concrete pressure, improved concrete fire resistance.
A certain amount of UEA swelling agent of concrete admixture is when itself and cement and water mix, because hydration reaction produces ettringite C 4A 3S32H 2O, volume increases mutually in the reaction, makes concrete produce microdilatancy, thereby certain supplementary function is played in concrete contraction, helps concrete long-term volume stability and improves concrete anti-permeability performance.
In order to contrast, high impervious duct pieces of shield tunnel material preparation has been prevented fires in a kind of low contraction according to the present invention high-performance section of jurisdiction G1 has done a contrast with the various performances of section of jurisdiction (G2) commonly used both at home and abroad.Conservation system is steam-cured water curing 7d afterwards, and natural curing is to 28d.Steam curing system is: the quiet 2h that stops, intensification 2h, temperature rise rate＜15 ℃/h, constant temperature 3h, 50 ℃ of thermostat temperatures, cooling 2h, rate of temperature fall＜15 ℃/h.Performance test comprises strength test and the 28d strength test of section of jurisdiction after steam-cured 9 hours; The impermeability test of monolithic section of jurisdiction; The CL of core sampling back, section of jurisdiction sample -Ionic diffusion coefficient and fire endurance test.
The every test index in table 8 section of jurisdiction
Figure C200610125591D00091
By table as can be seen, the 9h intensity and the 28d intensity of two kinds of sections of jurisdiction are more or less the same, and all can satisfy the concrete strength design requirements, and it is little that the concrete 28d shrinkage value of G1 is compared G2, and the fire endurance of G1 and impervious grade be much larger than G2, the CL of G1 -Spread coefficient is much smaller than G2.On the whole, long durability energy, volume stability, the fire resistance of section of jurisdiction are greatly improved.
Can improve the volume stability of concrete pipe sheet under the compound action of these materials of the present invention greatly, 28d drying shrinkage value is 1.95 * 10 -4, guarantee the section of jurisdiction dimensional precision, improve section of jurisdiction integral waterproofing anti-permeability performance, reach more than the P16, and improve its long durability energy and fire resistance.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
One, material is selected:
1, cement is the 42.5R ordinary Portland cement.
2, flyash is I level flyash, and density is 2.7g/cm 3
3, breeze is that specific surface area is greater than 500m 2/ kg, density 2.8g/cm 3
4, fine aggregate is a river sand, and fineness modulus is 2.5-2.8.
5, coarse aggregate is a 5-25 continuous grading rubble, crush values＜10%.
6, fiber is a porous polypropylene nitrile fiber, and proportion 0.91, tensile strength 620-785MPa, Young's modulus is greater than 3500MPa, elongation at break 8%.
7, swelling agent is a UEA type low-alkali high-efficiency cement expansive material, and relative density is 2.85, specific surface area 300～350m 2/ kg.Its feature is that volume is few, the usefulness height, and alkalinity is low.
8, efficient naphthalene water reducer.
9, water.
10, humidity compensate medium: (described silica-aluminum materials is that mud, aluminium content are the mixing of any one or two kinds in the II level flyash more than 30% to adopt silica-aluminum materials, mud and aluminium content are the II level flyash more than 30% when mixing, and aluminium content is that the II level flyash more than 30% accounts for mud and aluminium content is the 20-30% of the II level flyash quality more than 30%; Perhaps mud mixes with kaolinic, and mud accounts for the 20-30% of mud and kaolin quality.) and the foaming ingredient coke powder through 1150～1200 ℃ of high-temperature roasting 20～30min, the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17～0.25; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa.The pore distribution situation sees Table 1.
The pore distribution of table 1 humidity compensate dielectric material
Figure C200610125591D00101
The salient features of table 2 humidity compensate material
Figure C200610125591D00102
The water-intake rate characteristic of table 3 humidity compensate material
Figure C200610125591D00103
The concrete consumption of humidity compensate medium determines that by formula equal-volume replaces coarse aggregate then, and concrete formula is as follows:
m = C f · CS · α max S
C f-folk prescription concrete cement consumption, kg/m 3
CS-required the amount of extra water of unit mass hydrated cementitious generally gets 0.06kg/kg cement;
α Max-concrete maximum possible degree of hydration (water-cement ratio/0.36);
The water-intake rate of S-humidity compensate material, %;
The volume of m-humidity compensate material, kg/m 3
Two, embodiment:
Embodiment 1:
A kind of low contraction high impervious shield tunnel sheet material of preventing fires, it is mainly formed fully by cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, efficient naphthalene water reducer and water mixed raw material, and each raw material weight proportioning is: cement 360kg/m 3, flyash 120kg/m 3, fine aggregate 690kg/m 3, coarse aggregate 1100kg/m 3, humidity compensate medium 50kg/m 3, fiber 0.8kg/m 3, swelling agent 20kg/m 3, the volume of water is pressed water-cement ratio 0.29, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.3% of cement, flyash, the total gelling material quality of swelling agent.
Above-mentioned a kind of low contraction high impervious duct pieces of shield tunnel preparation methods of preventing fires, it comprises the steps:
1), the preparation of humidity compensate medium: silica-aluminum materials---mud and foaming ingredient coke powder are through 1150 ℃ of high-temperature roasting 20min, and the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17 in employing; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa;
2), choose cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer raw material by above-mentioned each raw material weight proportioning;
3), place water fully wetting in the humidity compensate medium before the stirring; Above-mentioned each raw material is stirred moulding according to normal concrete formation program, be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
Embodiment 2:
A kind of low contraction high impervious shield tunnel sheet material of preventing fires, it is mainly formed fully by cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer mixed raw material, and each raw material weight proportioning is: cement 380kg/m 3, flyash 100kg/m 3, fine aggregate 700kg/m 3, coarse aggregate 1140kg/m 3, humidity compensate medium 100kg/m 3, fiber 1.5kg/m 3, swelling agent 25kg/m 3, the volume of water is pressed water-cement ratio 0.30, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.5% of cement, flyash, the total gelling material quality of swelling agent.
Above-mentioned a kind of low contraction high impervious duct pieces of shield tunnel preparation methods of preventing fires, it comprises the steps:
1), the preparation of humidity compensate medium: silica-aluminum materials---mud and foaming ingredient coke powder are through 1200 ℃ of high-temperature roasting 30min, and the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.20 in employing; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa;
2), choose cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer raw material by above-mentioned each raw material weight proportioning;
3), place water fully wetting in the humidity compensate medium before the stirring; Above-mentioned each raw material is stirred moulding according to normal concrete formation program, be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
Embodiment 3:
A kind of low contraction high impervious shield tunnel sheet material of preventing fires, it is mainly formed fully by cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer mixed raw material, and each raw material weight proportioning is: cement 400kg/m 3, flyash 80kg/m 3, fine aggregate 720kg/m 3, coarse aggregate 1180kg/m 3, humidity compensate medium 150kg/m 3, fiber 2kg/m 3, swelling agent 30kg/m 3, the volume of water is pressed water-cement ratio 0.32, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.6% of cement, flyash, the total gelling material quality of swelling agent.
Above-mentioned a kind of low contraction high impervious duct pieces of shield tunnel preparation methods of preventing fires, it comprises the steps:
1), the preparation of humidity compensate medium: adopt silica-aluminum materials---aluminium content be 31% II level flyash and foaming ingredient coke powder through 1200 ℃ of high-temperature roasting 30min, the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.25; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa;
2), choose cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer raw material by above-mentioned each raw material weight proportioning;
3), place water fully wetting in the humidity compensate medium before the stirring; Above-mentioned each raw material is stirred moulding according to normal concrete formation program, be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
Embodiment 4:
A kind of low contraction high impervious shield tunnel sheet material of preventing fires, it is mainly formed fully by cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer mixed raw material, and each raw material weight proportioning is: cement 380kg/m 3, flyash 100kg/m 3, fine aggregate 700kg/m 3, coarse aggregate 1140kg/m 3, humidity compensate medium 100kg/m 3, fiber 1.5kg/m 3, swelling agent 25kg/m 3, the volume of water is pressed water-cement ratio 0.30, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.5% of cement, flyash, the total gelling material quality of swelling agent.
Above-mentioned a kind of low contraction high impervious duct pieces of shield tunnel preparation methods of preventing fires, it comprises the steps:
1), the preparation of humidity compensate medium: adopt silica-aluminum materials (silica-aluminum materials is that mud and aluminium content are the II level flyash more than 30%) and foaming ingredient coke powder through 1200 ℃ of high-temperature roasting 30min, the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.20, wherein the II level flyash more than 30% account for mud and aluminium content be more than 30% II level flyash quality 25%; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa;
2), choose cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer raw material by above-mentioned each raw material weight proportioning;
3), place water fully wetting in the humidity compensate medium before the stirring; Above-mentioned each raw material is stirred moulding according to normal concrete formation program, be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
Embodiment 5:
A kind of low contraction high impervious shield tunnel sheet material of preventing fires, it is mainly formed fully by cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer mixed raw material, and each raw material weight proportioning is: cement 330kg/m 3, breeze 130kg/m 3, fine aggregate 690kg/m 3, coarse aggregate 1100kg/m 3, humidity compensate medium 50kg/m 3, fiber 0.8kg/m 3, swelling agent 20kg/m 3, the volume of water is pressed water-cement ratio 0.29, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.4% of cement, breeze, the total gelling material quality of swelling agent.
Above-mentioned a kind of low contraction high impervious duct pieces of shield tunnel preparation methods of preventing fires, it comprises the steps:
1), the humidity compensate medium: adopt silica-aluminum materials---aluminium content be II level flyash more than 30% and foaming ingredient coke powder through 1150 ℃ of high-temperature roasting 20min, the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa;
2), choose cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, efficient naphthalene water reducer and water raw material by above-mentioned each raw material weight proportioning;
3), place water fully wetting in the humidity compensate medium before the stirring; Above-mentioned each raw material is stirred moulding according to normal concrete formation program, be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
Embodiment 6:
A kind of low contraction high impervious shield tunnel sheet material of preventing fires, it is mainly formed fully by cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, efficient naphthalene water reducer and water mixed raw material, and each raw material weight proportioning is: cement 360kg/m 3, breeze 100kg/m 3, fine aggregate 720kg/m 3, coarse aggregate 1180kg/m 3, humidity compensate medium 150kg/m 3, fiber 2kg/m 3, swelling agent 30kg/m 3, the volume of water is pressed water-cement ratio 0.32, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.6% of cement, breeze, the total gelling material quality of swelling agent.
Above-mentioned a kind of low contraction high impervious duct pieces of shield tunnel preparation methods of preventing fires, it comprises the steps:
1), humidity compensate medium: adopt silica-aluminum materials (silica-aluminum materials is that mud and aluminium content are the II level flyash more than 30%) and foaming ingredient coke powder through 1200 ℃ of high-temperature roasting 30min, the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.25, wherein aluminium content be II level flyash more than 30% account for mud and aluminium content be more than 30% II level flyash quality 30%; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa;
2), choose cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, efficient naphthalene water reducer and water raw material by above-mentioned each raw material weight proportioning;
3), place water fully wetting in the humidity compensate medium before the stirring; Above-mentioned each raw material is stirred moulding according to normal concrete formation program, be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
Embodiment 7:
A kind of low contraction high impervious shield tunnel sheet material of preventing fires, it is mainly formed fully by cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, efficient naphthalene water reducer and water mixed raw material, and each raw material weight proportioning is: cement 345kg/m 3, breeze 115kg/m 3, fine aggregate 700kg/m 3, coarse aggregate 1140kg/m 3, humidity compensate medium 100kg/m 3, fiber 1.5kg/m 3, swelling agent 25kg/m 3, the volume of water is pressed water-cement ratio 0.30, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.5% of cement, breeze, the total gelling material quality of swelling agent.
Above-mentioned a kind of low contraction high impervious duct pieces of shield tunnel preparation methods of preventing fires, it comprises the steps:
1), humidity compensate medium: silica-aluminum materials---mud and foaming ingredient coke powder are through 1150 ℃ of high-temperature roasting 20min, and the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17 in employing; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa;
2), choose cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, efficient naphthalene water reducer and water raw material by above-mentioned each raw material weight proportioning;
3), place water fully wetting in the humidity compensate medium before the stirring; Above-mentioned each raw material is stirred moulding according to normal concrete formation program, be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
Embodiment 8:
A kind of low contraction high impervious shield tunnel sheet material of preventing fires, it is mainly formed fully by cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, efficient naphthalene water reducer and water mixed raw material, and each raw material weight proportioning is: cement 345kg/m 3, breeze 115kg/m 3, fine aggregate 700kg/m 3, coarse aggregate 1140kg/m 3, humidity compensate medium 100kg/m 3, fiber 1.5kg/m 3, swelling agent 25kg/m 3, the volume of water is pressed water-cement ratio 0.30, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.5% of cement, breeze, the total gelling material quality of swelling agent.
Above-mentioned a kind of low contraction high impervious duct pieces of shield tunnel preparation methods of preventing fires, it comprises the steps:
1), humidity compensate medium: adopt silica-aluminum materials (silica-aluminum materials is mud and kaolin) and foaming ingredient coke powder through 1150 ℃ of high-temperature roasting 20min, the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.20, and wherein kaolin accounts for 20% of mud and kaolin quality; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa;
2), choose cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, efficient naphthalene water reducer and water raw material by above-mentioned each raw material weight proportioning;
3), place water fully wetting in the humidity compensate medium before the stirring; Above-mentioned each raw material is stirred moulding according to normal concrete formation program, be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
Three, be in normal concrete, to replace after a part of coarse aggregate the correlative value of concrete performance below with humidity compensate dielectric material equal-volume.
Comparative example 1: concrete each the raw material weight proportioning in flyash section of jurisdiction sees Table 4.
Table 4 flyash section of jurisdiction concrete mix
Figure C200610125591D00141
Table 5 flyash section of jurisdiction coagulation body performance comparison
Figure C200610125591D00142
Figure C200610125591D00151
Comparative example 2: concrete each the raw material weight proportioning in breeze section of jurisdiction sees Table 6.
Table 6 breeze section of jurisdiction concrete mix
Figure C200610125591D00152
Table 7 breeze section of jurisdiction coagulation body performance comparison
Figure C200610125591D00153
By table 4～7 as can be seen: when utilizing humidity compensate dielectric material equal volume amounts replacement inside concrete to gather materials, humidity compensate dielectric material volume is at 10-30% (50-160kg/m 3) in the time, concrete ultimate compression strength, Young's modulus increase with humidity compensate dielectric material volume and change not obviously, and concrete other performances are significantly improved, 28d drying shrinkage value obviously reduces, fire endurance improves.

Claims (9)

1. one kind low is shunk the high impervious shield tunnel sheet material of fire prevention, it is characterized in that it is mainly formed fully by cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer mixed raw material, each raw material weight proportioning is: cement 360-400kg/m 3, flyash 80-120kg/m 3, fine aggregate 690-720kg/m 3, coarse aggregate 1100-1180kg/m 3, humidity compensate medium 50-150kg/m 3, fiber 0.8-2kg/m 3, swelling agent 20-30kg/m 3, the volume of water is pressed water-cement ratio 0.29-0.32, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.3-1.6%;
Wherein the humidity compensate medium is to adopt silica-aluminum materials and foaming ingredient coke powder through 1150～1200 ℃ of high-temperature roasting 20～30min, and the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17～0.25; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa.
2. a kind of low contraction according to claim 1 high impervious shield tunnel sheet material of preventing fires, it is characterized in that: described flyash is I level flyash, and density is 2.7g/cm 3
3. one kind low is shunk the high impervious shield tunnel sheet material of fire prevention, it is characterized in that it is mainly formed fully by cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer mixed raw material, each raw material weight proportioning is: cement 330-360kg/m 3, breeze 100-130kg/m 3, fine aggregate 690-720kg/m 3, coarse aggregate 1100-1180kg/m 3, humidity compensate medium 50-150kg/m 3, fiber 0.8-2kg/m 3, swelling agent 20-30kg/m 3, the volume of water is pressed water-cement ratio 0.29-0.32, mixes efficient naphthalene water reducer outward, and the quality of mixing of efficient naphthalene water reducer is 1.4-1.6%;
Wherein the humidity compensate medium is to adopt silica-aluminum materials and foaming ingredient coke powder through 1150～1200 ℃ of high-temperature roasting 20～30min, and the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17～0.25; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa.
4. a kind of low contraction according to claim 3 high impervious shield tunnel sheet material of preventing fires, it is characterized in that: described breeze is that specific surface area is greater than 500m 2/ kg, density 2.8g/cm 3
5. according to claim 1 or the 3 described a kind of low contractions high impervious shield tunnel sheet material of preventing fires, it is characterized in that: described cement is the 42.5R ordinary Portland cement; Described fine aggregate is a river sand, and fineness modulus is 2.5-2.8; Described coarse aggregate is a 5-25 continuous grading rubble, crush values＜10%; Described fiber is a porous polypropylene nitrile fiber, and proportion 0.91, tensile strength 620-785MPa, Young's modulus is greater than 3500MPa, elongation at break 8%; Described swelling agent is a UEA type low-alkali high-efficiency cement expansive material, and relative density is 2.85, specific surface area 300～350m 2/ kg.
6. according to claim 1 or the 3 described a kind of low contractions high impervious shield tunnel sheet material of preventing fires, it is characterized in that: described silica-aluminum materials is that mud, aluminium content are the mixing of any one or two kinds in the II level flyash more than 30%, mud and aluminium content are the II level flyash more than 30% when mixing, and aluminium content is that the II level flyash more than 30% accounts for mud and aluminium content is the 20-30% of the II level flyash quality more than 30%; Perhaps mud mixes with kaolinic, and kaolin accounts for the 20-30% of mud and kaolin quality.
7. according to claim 1 or the 3 described a kind of low contractions high impervious shield tunnel sheet material of preventing fires, it is characterized in that: the concrete consumption of described humidity compensate medium determines that by formula formula is as follows:
m = C f · CS · α max s
C f-folk prescription concrete cement consumption, units/m 3
CS-required the amount of extra water of unit mass hydrated cementitious; Get 0.06kg/kg cement;
α Max-concrete maximum possible degree of hydration; For: water-cement ratio/0.36
The water-intake rate of S-humidity compensate material, the % of unit;
The volume of m-humidity compensate material, units/m 3
8. a kind of low contraction according to claim 1 high impervious duct pieces of shield tunnel preparation methods of preventing fires is characterized in that it comprises the steps:
1), the preparation of humidity compensate medium: adopt silica-aluminum materials and foaming ingredient coke powder through 1150～1200 ℃ of high-temperature roasting 20～30min, the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17～0.25; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%; 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa;
2), be: cement 360-400kg/m by each raw material weight proportioning 3, flyash 80-120kg/m 3, fine aggregate 690-720kg/m 3, coarse aggregate 1100-1180kg/m 3, humidity compensate medium 50-150kg/m 3, fiber 0.8-2kg/m 3, swelling agent 20-30kg/m 3Choose cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, 0.29-0.32 chooses water by water-cement ratio, and the efficient naphthalene water reducer of mixing outward is that 1.3-1.6% chooses by mixing quality;
3), place water fully wetting in the humidity compensate medium before the stirring; Cement, flyash, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer raw material are stirred moulding according to normal concrete formation program; be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
9. a kind of low contraction according to claim 3 high impervious duct pieces of shield tunnel preparation methods of preventing fires is characterized in that it comprises the steps:
1), the preparation of humidity compensate medium: adopt silica-aluminum materials and foaming ingredient coke powder through 1150～1200 ℃ of high-temperature roasting 20～30min, the quality of silica-aluminum materials and foaming ingredient coke powder is 1:0.17～0.25; After the cooling, a kind of porous structure material that obtains, this porous structure material has following feature: 1. porosity is 50-60%: 2. water-intake rate is 8-12%; 3. cylindrical compress strength is more than the 6.5Mpa;
2), be: cement 330-360kg/m by each raw material weight proportioning 3, breeze 100-130kg/m 3, fine aggregate 690-720kg/m 3, coarse aggregate 1100-1180kg/m 3, humidity compensate medium 50-150kg/m 3, fiber 0.8-2kg/m 3, swelling agent 20-30kg/m 3Choose cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, 0.29-0.32 chooses water by water-cement ratio, and the efficient naphthalene water reducer of mixing outward is that 1.4-1.6% chooses by mixing quality;
3), place water fully wetting in the humidity compensate medium before the stirring; Cement, breeze, fine aggregate, coarse aggregate, humidity compensate medium, fiber, swelling agent, water and efficient naphthalene water reducer raw material are stirred moulding according to normal concrete formation program; be cast in the mould, through vibrating, wipe one's face, can obtaining after steam-cured, the form removal.
CNB2006101255910A 2006-12-26 2006-12-26 Low shrinken, fireproof, high leakage resisted material of duct piece for shield tunnel, and preparation method Active CN100506737C (en)

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