CN102515658B - Common pipe ditch cast-in-place extrusion flow state concrete lining material - Google Patents

Common pipe ditch cast-in-place extrusion flow state concrete lining material Download PDF

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Publication number
CN102515658B
CN102515658B CN 201110376611 CN201110376611A CN102515658B CN 102515658 B CN102515658 B CN 102515658B CN 201110376611 CN201110376611 CN 201110376611 CN 201110376611 A CN201110376611 A CN 201110376611A CN 102515658 B CN102515658 B CN 102515658B
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concrete
cement
lining
flow state
common pipe
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CN102515658A (en
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洪开荣
李文俊
干昆蓉
杨立新
李治国
付仲润
李建华
王光辉
于少辉
杨卓
王菀
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China Railway Tunnel Group Co Ltd CRTG
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China Railway Tunnel Group Co Ltd CRTG
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Abstract

The invention relates to a common pipe ditch cast-in-place extrusion flow state concrete lining material, which is used in an extrusion flow state concrete material. strength grade of configured concrete is C30, 42.5 grades ordinary Portland cement is adopted, content of C3A is required to be less than 8%, fineness modulus of fine aggregate are 2.6-3.0, grain size scope of coarse aggregate is 5-31.5mm, sand ratio is 36-40%, coal ash occupies 20% of total weight of gelled materials, and water to binder ratio scope is controlled in a range of 0.40-0.44. Mix proportion with the unit of Kg/m3 of the concrete material is the cement of 320-355, the river sand of 630-690, the gravel of 1080-1160, the coal ash of 80-90, water of 175-185, and dosage of flow accelerated corrosion (FAC) high efficiency slushing agent is 1.5-1.8% of the weight of the gelled material. The common pipe ditch cast-in-place extrusion flow state concrete lining material conducts a 1:1 testing model test, workability index, strength index and cement dosage all meet requirements, and anti-permeability of the concrete is larger than P20. Various indexes of the concrete all meet design requirements.

Description

Common pipe ditch cast-in-place extrusion flow state concrete lining material
Technical field
The present invention relates to a kind ofly for extruding fluidised form concrete material, relate generally to a kind of common pipe ditch cast-in-place extrusion flow state concrete lining material.
Background technology
Existing common pipe trench liner structure uses the precast concrete tunnel segment structure more, and this section of jurisdiction forms lining cutting through prefabricated, transportation, assembly unit.This lining types is now common pipe trench structure formation commonly used.But because the type lining cutting is assembling-type, its longitudinal and transverse circumferential weld easily produces seepage, must seal with bolt with a large amount of gaskets and connect and carry out waterproof work, and relatively large by the caused ground settlement amount of the type lining cutting, the required expense of section of jurisdiction and lining construction thereof accounts for 30% left and right of construction total expenses, and executive cost is higher.Compare the prefabricated pipe section lining cutting, the concrete lining of cast-in-place extruding fluidised form is gone forward side by side due to lining cutting and driving, and is minimum on the earth's surface impact during construction.The lining cutting good integrity is taken without waterproof repairment, and construction speed is fast, the duration is short, executive cost reduces.
Owing to adopting cast-in-place form, i.e. in the time of shield driving, concrete is built, and the space that forms for filling better shield driving require concrete that the larger slump is arranged, and concrete must have higher function of slump protection; Because this constructional method adopts lining shuttering, for effectively carrying out the template circulation, require the concrete lining of moulding must have higher early strength grade simultaneously.The particular requirement of above two aspects, the assurance aspect difficulty of mix Design and final lining construction quality is larger.Domestic cast-in-place extruding fluidised form concrete lining technology still belongs to blank at present, does not also form the technical scheme of cast-in-place extruding fluidised form Concrete.
Configure the concrete of above-mentioned performance, its key is: the firstth, and raw-material selection mainly comprises cement type, the selection of admixture etc.The performance index such as every kind of material specification are strictly controlled.The secondth, the mix-design of science, final concrete not only must have the larger slump, higher function of slump protection, early strength and final strength, and the concrete work performance is excellent, satisfies the requirement of site pumping pouring construction.
Summary of the invention
Purpose of the present invention is namely to propose a kind of common pipe ditch cast-in-place extrusion flow state concrete lining material.
Technical scheme of the present invention is to the structural state of common pipe trench and the characteristics of cast-in-place extruded concrete material, and be combined with the requirement to cast-in-place extruded concrete lining in common pipe trench, propose on the basis of the characteristic of the structural state of common pipe trench and various concrete materials being carried out large component analysis.
The characteristic requirements that is used for common pipe ditch cast-in-place extrusion flow state concrete lining material:
1, mechanical index:
A, the present invention are owing to adopting cast-in-place extruding fluidised form concrete lining to replace traditional prefabricated pipe section, consider the economic rationality of processing requirement and construction itself, require the concrete lining of extrusion molding that higher early strength (1d intensity 10MPa) is arranged, be convenient to the reasonable Efficient Cycle of lining shuttering.
B, common pipe trench are because buried depth is more shallow, and the less such as the earthing pressure that lining cutting self is born and hydraulic pressure require the final strength grade of cast-in-place extruding fluidised form concrete lining relatively low, and lining design strength grade of the present invention is chosen as C30.
2, workability: fresh concrete will have better serviceability.Comprise that (the initial slump 220 ~ 240mm), high slump retaining (more than in 3h, the slump remains on 200mm), better workability require concrete not emanate, bleeding not to be to satisfy requirements such as effectively filling space that shield driving forms and site pumping construction to large fluidity simultaneously.
3, weather resistance: consider the requirement in work-ing life of common pipe trench, require concrete lining to have higher weather resistance, comprising impermeability, splitting resistance, freeze-thaw-circulation etc.
The technical scheme that the present invention takes is:
A kind of common pipe ditch cast-in-place extrusion flow state concrete lining concrete material, common pipe ditch cast-in-place extrusion flow state concrete lining material are selected and preparation:
According to the concrete mechanical performance index requirement of common pipe trench extruding fluidised form, cement selection super-early strength cement or ordinary Portland cement+efficient additive dual mode, consider that when super early stage cement uses, hydration rate is very fast, the cement drying shrinkage is larger, be unfavorable for the cracking resistance that concrete lining is final, consider simultaneously this cement construction cost and the problem of applying from now on, the present invention selects ordinary Portland cement to coordinate the high efficiency water reducing agent mode.
The concrete of configuration C30 strength grade, due to the contradictory relation between the long high slump (more than the above slump maintenance of 200mm 3h) and own early strength higher (more than 1d intensity 10MPa), larger to the late strength of concrete loss, for reaching the final requirement of strength of concrete lining.The present invention adopts 42.5 grades of ordinary Portland cements.Adopt the class g cements such as this label, under the prerequisite that reaches identical concrete strength and the slump, can reduce single cement consumption.
For reaching above-mentioned concrete property indices, raw-material selection is most important.
1, for making concrete reach high workability and function of slump protection more than the above 200mm of 3h, the requirement of cement is mainly comprised the following aspects:
(1) mainly containing four kinds of mineralogical compositions in cement clinker, is respectively C 3S, C 2S, C 3A and C 4AF.General ordinary Portland cement, C 3The general range of A content is 7% ~ 15%.C wherein 3The content of A is larger on the impact of hydrated cementitious speed, in concrete construction process, hydration heat of cement is larger, and the heat that reaction produces focuses on the release of at short notice, be prone to that concrete temperature rise speed is too fast and temperature is higher, easily cause concrete cracking to occur because of thermal stress.Finally cause concrete impermeability to descend.
Simultaneously, C in cement 3When A is too high, the bad adaptability of cement and concrete admixture, concrete slump loss is large, and the Concrete Resist Reinforcing Sulfate Corrosion ability descends.Therefore, the cement that the present invention uses requires C 3The content of A should be less than 8%.
(2) cement fineness refers to the fineness that cement granules is overall.Cement granules is thinner, and the surface-area of giving birth to reaction with steeping in water for reconstitution is larger, thereby the hydration reaction speed, and aquation is more complete, and early strength is also higher, but the sclerosis shrinkability is larger in air, and cost is also higher.
It is generally acknowledged cement granules when 0~10 μ m, aquation is the fastest; When 3~30 μ m, the active maximum of cement; During greater than 60 μ m, activity is less, and aquation is slow; During greater than 90 μ m, can only carry out surface hydration, only play the effect of micro-aggregate.The present invention requires that in cement, 10 ~ 30 μ m grain compositions are controlled at 35 ~ 45%, controls the ratio of 3 ~ 10 shared cement of μ m grating, is controlled at below 15% other grain composition::<3 μ m and 30 μ m are controlled at below 40%.Cement specific surface area is controlled at 330 ~ 350 m 2/ kg.
(3) in cement, the size of alkali content directly affects concrete weather resistance.The present invention adopts low alkali cement, namely in cement alkali content less than 0.60%.Adopt low alkali cement can improve concrete function of slump protection to a certain extent, the concrete durability that also can effectively suppress simultaneously to cause due to alkali destroys.
Therefore, the net result of cement selection of the present invention is: cement minerals composition C 3A content should be less than 8%; In cement, 10 ~ 30 μ m grain compositions are controlled at 35 ~ 45%, control the ratio of 3 ~ 10 shared cement of μ m grating, be controlled at below 15%, other grain composition (<3 μ m reach〉30 μ m) be controlled at below 40%, and cement specific surface area is controlled at 330 ~ 350 m 2/ kg.In cement, alkali content should be less than 0.60%.
2, fine aggregate is selected river sand.The present invention is advisable with medium sand, and fineness modulus is 2.6~3.0, and grating satisfies " JGJ 52-2006 regular concrete sand, stone quality and test method standard " requirement.To strictly control silt content, clod content and harmful substance contents according to GB/T14684 simultaneously.In addition, fine aggregate will carry out the basic active check, destroys to avoid concrete structure generation alkali-aggregate reaction.
3, coarse aggregate is selected rubble.Particle size range is 5 ~ 31.5 ㎜.Gradation of coarse aggregate and other performance index satisfy " JGJ 52-2006 regular concrete sand, stone quality and test method standard " requirement.If maximum size of coarse aggregate is too small, must increase the total surface-area of coarse aggregate, increase every side's the reinforcement of concrete water yield and cement consumption, finally increased the possibility of concrete cracking.
4, extra material is selected flyash.Mix flyash and can effectively improve concrete workability, reduce cement consumption.Flyash of the present invention is preferentially selected the first level flour coal ash, minimum use second class powered coal ash.The rational volume of flyash of the present invention is 20%, and namely flyash accounts for 20% of gelling material (cement and flyash) total amount.When doping quantity of fly ash is excessive, have a strong impact on the concrete early strength intensity of extruding fluidised form, larger to the absorption of admixture because the general alkalinity of flyash is bigger than normal simultaneously, when increasing the admixture consumption, also be unfavorable for the weather resistance that concrete is final.
5, admixture is selected high-efficiency water-reducing agent of poly-carboxylic acid.Its standard satisfies GB8076 " concrete admixture " requirement, for effectively lower the concrete mixing water consumption when increasing concrete slump, requires the high efficiency water reducing agent of use, and its water-reducing rate must be not less than 30%.The present invention adopts FAC poly carboxylic acid highly efficiency compositional water reducer, volume is 1.5 ~ 1.8% of gelling material weight, actual water-reducing rate is about 33%, can reduce significantly cement consumption under the prerequisite that guarantees early age strength of concrete, final strength and concrete mix workability.
The present invention is used in the determining of cast-in-place extruded concrete lining concrete technology index of common pipe trench:
(1) configuration intensity
According to " design of common concrete proportioning rules ", common pipe trench extruded concrete lining design strength is C30, and concrete is got strength criterion and differed from 4.0 MPa, and concrete preparation strength is defined as:
f cu,o = f cu,k +1.645σ=30+1.645×4.0=36.58Mpa
(2) durability index
Impervious classification is P20.For avoiding the excessive concrete cracking that causes of hydration heat of concrete and thermal stress, cement consumption of the present invention is no more than 360kg/m 3
(3) Construction performance standard
For guaranteeing concrete workability, satisfy pumping construction and concrete extrusion dehydration processing requirement, the initial slump of fresh concrete is defined as 220~240mm, more than the 3h slump remains on 200mm.And at this moment a section inner concrete do not emanate, bleeding not.
Mix Design
(1) water cement ratio
According to " design of common concrete proportioning rules " requirement, concrete water-cement ratio calculates according to following formula:
w/c=
F in formula ceAnd f Cu, oRepresent respectively actual cement strength and concrete preparation strength in the 28 day length of time, w/c is water cement ratio.Adopt the PO42.5 class g cement, after the admixture high efficiency water reducing agent, the water-cement ratio scope control is 0.40~0.44.
(2) water consumption
The concrete mixing unit consumption of water is directly connected to the slump and the workability thereof of fresh concrete, use the river sand (medium sand) of qualified drying, under the prerequisite that satisfies the initial slump 200~240mm, according to " design of common concrete proportioning rules " requirement, after the admixture high efficiency water reducing agent, the water consumption scope control is at 175~185kg/m 3
(3) cement consumption
Cement consumption of the present invention is controlled at 360 kg/m 3Below.Can effectively improve concrete weather resistance, prevent concrete cracking.
(4) doping quantity of fly ash
Mixing of flyash can improve concrete workability effectively, also can replace part of cement simultaneously, lowers cement consumption, improves concrete durability.But doping quantity of fly ash is excessive, early age strength of concrete and weather resistance there is certain impact.The add-on of flyash of the present invention is 20% of gelling material weight, and described gelling material is cement and flyash.
(5) sand coarse aggregate ratio
The change of sand coarse aggregate ratio can make the total surface area of aggregate that remarkable change is arranged, thereby the workability of concrete mix is had considerable influence.Under the prerequisite that guarantees cohesiveness that concrete mix has and mobility, determine optimum sand coarse aggregate ratio.Sand coarse aggregate ratio of the present invention is preferably 36 ~ 40%.Described sand coarse aggregate ratio is that the quality of fine aggregate sand accounts for all slightly, the per-cent of fine aggregate.
About concrete construction technology, in weighing, stirring, transportation, pumping, the link such as build, the technological measure of the present invention and normal concrete structure is all roughly the same, but larger difference is being arranged aspect the concrete lining moulding.
General concrete lining is all by the moulding of assembly unit prefabricated pipe section, and the present invention and difference in the past are, have fully and completely changed lining cutting molding mode in the past, by cast-in-place, extruded concrete, makes the closely knit moulding of concrete dehydration.Namely in shield driving, by the fill orifice of reserving on shield tail template, fresh concrete is pumped in the space that is surrounded by the excavation soil body (or rock mass) and lining shuttering, because concrete has the higher slump, therefore can effectively fill this space; Again by shield structure extruding jack pressurizing and dehydrating, increase concrete density after perfusion, and final and excavation face has formed the lining cutting that closely is affixed.Wherein crucial construction technology is squeeze pressure and the dwell time control after concrete spouting.Concrete squeeze pressure of the present invention is 0.4Mpa, dwell time 30min, can guarantee that concrete fills the space that shield driving forms effectively, control ground settlement, more than the concrete lining 1d intensity of extrusion dehydration moulding can reach 10MPa, effectively carry out the circulation of lining shuttering, 28d intensity can meet design requirement greater than 45MPa.
The proportioning of described concrete material is (Kg/m 3): cement PO42.5 level 320 ~ 355, river sand (medium sand) 630 ~ 690, (5 ~ 31.5mm) 1080 ~ 1160, flyash 80 ~ 90, water 175 ~ 185, FAC high efficiency water reducing agent consumption are 1.5 ~ 1.8% of gelling material (cement and flyash) weight to rubble.
Common pipe ditch cast-in-place extrusion flow state concrete material, proportioning proposed by the invention; Adopting pressure in construction is that 0.40MPa pressure is to the concrete extrusion dehydration, dwell time is controlled at 30min, and through the test of 1:1 trial model, workability index and intensity index and cement consumption all meet the demands, carry out the concrete permeability resistance proof test, result is greater than P20.The concrete indices all reaches design requirements, has proved that cast-in-place extruding chutable concrete and constructional method are feasible, and can guarantee construction quality.
Embodiment
Embodiment 1:
Concrete mix of the present invention is (Kg/m 3): 42.5 grade 343 of cement, river sand (medium sand) 673, rubble 1098, flyash 86, water 180, FAC high efficiency water reducing agent volume is 1.5% of binder total amount; Water-cement ratio is 0.42.The initial slump of concrete is 230mm, and the 3h slump is 200mm, R 116.3 Mpa, R2851.6Mpa.
Embodiment 2:
Concrete mix of the present invention is (Kg/m 3): 42.5 grade 333 of cement, river sand (medium sand) 645, rubble 1145, flyash 83, water 175, FAC high efficiency water reducing agent volume is 1.8% of binder total amount; Water-cement ratio is 0.42.The initial slump of concrete is 227mm, and the 3h slump is 200mm, R 119.9 Mpa, R2847.0Mpa.

Claims (1)

1. common pipe ditch cast-in-place extrusion flow state concrete lining material is characterized in that: in described concrete material, and the strength grade of concrete C30 that configures; Select ordinary Portland cement to coordinate the high efficiency water reducing agent mode; The cement that uses adopts 42.5 grades of ordinary Portland cements, requires C 3The content of A is less than 8%; Cement specific surface area is controlled at 330 ~ 350 m 2/ kg; In cement, alkali content is less than 0.60%; Fine aggregate in described concrete material adopts medium sand, and fineness modulus is 2.6~3.0; Coarse aggregate is selected rubble, and particle size range is 5 ~ 31.5 ㎜; In described concrete material, sand coarse aggregate ratio is 36 ~ 40%; In concrete material, flyash accounts for 20% of gelling material gross weight; In described concrete material, the water-cement ratio scope control is 0.40~0.44; The proportioning of described concrete material is: the unit of described proportioning is Kg/m 3Cement 320 ~ 355, river sand 630 ~ 690, rubble 1080 ~ 1160, flyash 80 ~ 90, water 175 ~ 185, FAC high efficiency water reducing agent consumption is 1.5 ~ 1.8% of gelling material weight; Use described material and proportioning configuration concrete, adopting squeeze pressure in construction is the 0.4Mpa extrusion dehydration, and pressure hold time is controlled 30min, and final concrete property indices can reach requirement.
CN 201110376611 2011-11-24 2011-11-24 Common pipe ditch cast-in-place extrusion flow state concrete lining material Active CN102515658B (en)

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CN105060801A (en) * 2015-07-17 2015-11-18 铜陵海源超微粉体有限公司 Proportioning method of C30 concrete
CN105236852A (en) * 2015-09-02 2016-01-13 铜陵翔宇商贸有限公司 C30 concrete preparation method
CN106186898A (en) * 2016-06-30 2016-12-07 成都聚合科技有限公司 A kind of light gathering photovoltaic power generating system pedestal mixes earth
CN106277955A (en) * 2016-07-25 2017-01-04 铜陵海源超微粉体有限公司 A kind of C30 concrete formulating method
CN106186887A (en) * 2016-07-25 2016-12-07 铜陵海源超微粉体有限公司 A kind of C20 concrete formulating method
CN106316296A (en) * 2016-08-24 2017-01-11 浙江省建工集团有限责任公司 Formulation suitable for grain reserve warehouse silo slips form construction concrete
CN111393113A (en) * 2020-04-09 2020-07-10 南通航宇结构件有限公司 Concrete for prefabricated tunnel lining segment and preparation method thereof

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CN101215136A (en) * 2007-12-29 2008-07-09 中铁隧道集团有限公司 Concrete material in tunnel lining C40 super-dense steel concrete and construction method thereof

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
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