CN114560657A - Large-scale racetrack soft soil foundation filling foam light soil material, preparation method and application - Google Patents
Large-scale racetrack soft soil foundation filling foam light soil material, preparation method and application Download PDFInfo
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- CN114560657A CN114560657A CN202210221816.1A CN202210221816A CN114560657A CN 114560657 A CN114560657 A CN 114560657A CN 202210221816 A CN202210221816 A CN 202210221816A CN 114560657 A CN114560657 A CN 114560657A
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- 239000002689 soil Substances 0.000 title claims abstract description 132
- 239000006260 foam Substances 0.000 title claims abstract description 122
- 239000000463 material Substances 0.000 title claims abstract description 52
- 238000011049 filling Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000004088 foaming agent Substances 0.000 claims abstract description 56
- 239000004568 cement Substances 0.000 claims abstract description 50
- 239000000843 powder Substances 0.000 claims abstract description 47
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 36
- 239000011707 mineral Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000010881 fly ash Substances 0.000 claims abstract description 30
- 239000002131 composite material Substances 0.000 claims abstract description 29
- 238000010276 construction Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 24
- 239000012745 toughening agent Substances 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 11
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- 238000003860 storage Methods 0.000 claims description 15
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- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical group CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 12
- 238000005187 foaming Methods 0.000 claims description 12
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- 238000007599 discharging Methods 0.000 claims description 6
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- 239000012744 reinforcing agent Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 239000003381 stabilizer Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
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- 150000001412 amines Chemical class 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 4
- 150000005846 sugar alcohols Polymers 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000009432 framing Methods 0.000 claims description 3
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- 238000007670 refining Methods 0.000 claims description 3
- 239000011550 stock solution Substances 0.000 claims description 3
- 239000010754 BS 2869 Class F Substances 0.000 claims 1
- 238000012423 maintenance Methods 0.000 claims 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/38—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions wherein the mixing is effected both by the action of a fluid and by directly-acting driven mechanical means, e.g. stirring means ; Producing cellular concrete
- B28C5/381—Producing cellular concrete
- B28C5/383—Producing cellular concrete comprising stirrers to effect the mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/38—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions wherein the mixing is effected both by the action of a fluid and by directly-acting driven mechanical means, e.g. stirring means ; Producing cellular concrete
- B28C5/381—Producing cellular concrete
- B28C5/386—Plants; Systems; Methods
- B28C5/388—Methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C9/00—General arrangement or layout of plant
- B28C9/02—General arrangement or layout of plant for producing mixtures of clay or cement with other materials
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
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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
- 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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/42—Pore formers
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- 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
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- 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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- Dispersion Chemistry (AREA)
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- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a foam light soil material for filling a large-scale racetrack soft soil foundation, a preparation method and application thereof, wherein the foam light soil material is prepared from the following raw materials in parts by weight: cement: 30-40 parts of mineral powder: 30-40 parts of fly ash: 30-50 parts of mixed composite reinforced foaming agent, 0.1-0.5 part of foam toughening agent and 60-70 parts of water. The cement consumption is low, the internal hydration heat is low, and the cracking of the foam lightweight soil caused by hydration temperature rise is avoided; the consumption of cement is reduced, so that the shrinkage rate of the foamed light soil is reduced, the volume stability is improved, and the durability of the foamed light soil is improved; the mineral powder and the fly ash are used in a large amount, and the volume stability and the later strength of the foamed light soil are improved. The vehicle-mounted mobile intelligent control system is adopted, so that the construction quality of the foamed light soil is guaranteed; the method is suitable for large-volume and large-area rapid construction; and by early-stage modeling refinement and layered and partitioned pouring, multi-point construction and ordered pouring are facilitated.
Description
Technical Field
The invention belongs to the technical field of road construction, and particularly relates to a foam light soil filling material for a large-scale racing track soft soil foundation, a preparation method and application.
Background
With the high-speed development of automobile intellectualization, networking and electromotion, in order to ensure the safety and reliability of the intelligent networking automobile before the automobile goes on the road, a large-scale intelligent networking automobile test field is imperatively built. The intelligent networking automobile test field pavement evenness requirement is quite high, and some similar F1 tracks, therefore, in the process of construction, the requirements for the road subgrade structure design and the construction technology are very strict. In order to reduce the load of the roadbed and avoid the influence of roadbed subsidence on the pavement quality, a large amount of foam light soil is often used as a roadbed filling material in the roadbed structure design. Usually, a large-scale intelligent networking automobile test field needs to be filled with more than 60 ten thousand square foam light soil if a road is constructed on a soft soil foundation, and some foam light soil is even more, which is undoubtedly a foam light soil structure with an overlarge volume.
The foamed light soil is mainly prepared by preparing foaming agent aqueous solution into foam by a physical method, uniformly mixing the foam with cement slurry according to a certain proportion, pumping the mixture to a construction site for pouring, and naturally curing the mixture to form the light material containing a large number of closed micro air holes. The porous cement-based material has wide application, and is generally called as 'foam concrete' if being used as functional materials such as roof insulation boards, partition boards and the like; if the foam light soil is used as a filling material for road foundation treatment, pipeline backfill and other projects, the foam light soil is generally called as foam light soil.
In the application of large-scale track soft soil foundation engineering, besides the requirements on technical indexes such as volume weight, compressive strength and the like of foam light soil, the concrete has the advantages of low internal hydration heat, high later strength, good durability, good economical efficiency, long-distance pipeline transportation and convenient and quick construction.
Disclosure of Invention
The invention provides a foam light soil filling material for a large-scale racetrack soft soil foundation, a preparation method and application, which are used for solving the technical problems of material proportioning, preparation, field application and the like of large-area foam concrete of the soft soil foundation.
In order to achieve the purpose, the invention adopts the following technical scheme:
the foam light soil material for filling the large-scale racetrack soft soil foundation comprises the following raw materials in parts by weight: cement: 30-40 parts of mineral powder: 30-40 parts of fly ash: 30-50 parts of mixed composite reinforced foaming agent, 0.1-0.5 part of foam toughening agent and 60-70 parts of water;
the mixed composite reinforced foaming agent is an ether alcohol composite foaming agent and comprises the following components: 2-20% of ether alcohol surfactant, 1-8% of amino acid surfactant, 0.1-1% of reinforcing agent, 0.01-1% of stabilizing agent and 70-93.89% of water.
Further, the feed comprises the following raw materials in parts by weight: cement: 30 parts of mineral powder: 30 parts of fly ash: 40 parts of mixed composite reinforced foaming agent 0.32 part, foam toughening agent 0.01 part and water 60 parts.
Further, the cement is P.O42.5 cement, the fly ash is F class II, and the mineral powder is S95 grade mineral powder prepared by grinding granulated blast furnace slag.
Further, the foam toughening agent is polyalcohol amine, and the analysis is pure.
Further, the preparation method of the foam light soil filling material for the large-scale racing track soft soil foundation comprises the following specific steps:
step one, weighing the following materials in parts by weight: cement: 30 parts of mineral powder: 30 parts of fly ash: 40 parts, weighing the dry powder, adding the dry powder into a high-efficiency vortex type stirrer (shaftless stirrer), uniformly mixing, adding 60 parts of water, rapidly stirring into uniform slurry through the vortex action, and completing the whole process within 1 min;
secondly, the prepared slurry is sent into a front end hopper of a building site vehicle-mounted mobile intelligent control system through a pumping pipeline;
diluting 0.32 part of the instant mixed composite reinforced foaming agent by using 100 times of water, and then dropwise adding 0.01 part of foam toughening agent; setting a foam density of 50kg/m3 in an intelligent control center through a touch screen, and directly blowing the diluted foaming agent into a foam slurry mixer for stirring;
fourthly, setting the density of the foamed light soil to be 600kg/m on a touch screen of the intelligent control center3The system automatically adjusts the material discharging speed of the slurry in the hopper, and the foamed lightweight soil with the wet density of 600 +/-30 kg/m3 can be prepared;
and step five, pumping the prepared foamed lightweight soil to a site for pouring, thereby completing the preparation of the foamed lightweight soil material.
Furthermore, in the third step, the foam-slurry mixer is a horizontal physical mixer, and the diversion guide vanes are welded on the middle shaft, so that slurry and foam rapidly pass through the mixer under the design pressure due to good slurry fluidity, and the mixing of the slurry and the foam is completed.
Further, for the pumping in the step five, the distance from the vehicle-mounted mobile intelligent control system to the site pouring is not more than 100m, and the short-distance pumping ensures that the foam is not broken and the wet density is changed in a small range or is not changed; and if the distance from the vehicle-mounted mobile intelligent control system to the site pouring is more than 100m due to road construction, adding a foam toughening agent during foam preparation.
Further, the application of the foam light soil material for filling the large-scale racing track soft soil foundation comprises the following specific steps:
step one, establishing a 3D model and refining the model according to a track design drawing, dividing the track into square or rectangular pouring units by adopting vertical layering and horizontal framing, wherein the area of a single pouring unit is not more than 400m to the maximum2At 200m2～30O m2Preferably; the casting height is controlled to be 0.5 m. The pouring units are sequentially marked and the central point and the four corner points are marked; and 2-5 mm expansion joints are reserved between adjacent pouring units, and the expansion joints of the upper layer and the lower layer are staggered.
The side line of the pouring unit adapts to the design of a construction joint;
secondly, arranging temporary stations of a vehicle-mounted mobile intelligent control system on one side or two sides of the track, and measuring and calculating the distance from the station to the farthest point of the pouring unit, wherein the distance is 100m and is a dividing point; when the distance is more than 100m, the foam toughening agent is added when the foam is prepared.
And step three, laying a conveying pipeline. Adopt the pipeline to carry from the interim website of on-vehicle portable intelligent control system to the pouring scene, the pipeline links to each other with the delivery pump, and the delivery pump is equipped with pressure gauge, flowmeter and flow control valve, and controls through the remote control end.
And step four, establishing a storage bin for cement, mineral powder, fly ash and water in a flat site, and preparing a slurry stirrer with accurate measurement. The uniformly mixed slurry is pumped into a front hopper of a vehicle-mounted mobile intelligent control system; the center of the hopper is provided with a planetary mixer with a slow rotating speed of 10-30 r/min, so that the slurry is prevented from settling and layering in the hopper.
And fifthly, a foaming agent storage chamber is arranged in the vehicle-mounted mobile intelligent control system, when the foaming agent is used, the stock solution is diluted by 100 times, then the intelligent control system sets the foam density of 50kg/m3 through a touch screen, the diluted foaming agent is directly blown into the corresponding slurry amount through an air compression pump and enters a foam slurry mixer for mixing, and therefore the foam light soil meeting the design requirements can be prepared.
And sixthly, during pouring, the vehicle-mounted mobile intelligent control system moves to a temporary station, qualified foamed light soil is pumped to be poured from the center of the pouring unit to the periphery, and a skip method is adopted for construction, the foundation of the track is treated by a single or combined stirring pile, a PHC (prestressed high-strength concrete) pipe pile and a pouring pile, graded broken stones are arranged at the tops of all pile types, a layer of steel wire mesh is laid on the graded broken stones and connected with the foamed light soil layer on the upper portion of the steel wire mesh into a whole until the pouring of the foamed light soil layer on the whole track is finished.
Further, the vehicle-mounted mobile intelligent control system comprises a control room, a vehicle-mounted front hopper, a foaming agent storage room and a foam slurry mixer, which are all loaded by an automobile or a truck; the vehicle-mounted front hopper, the foaming agent storage chamber and the foam slurry mixer are all controlled in the process through a control panel of the control chamber, wherein the foaming agent storage chamber also comprises an air compressor, and the size and the quantity of foaming in the foaming agent are ensured by controlling the air speed and the pressure of the air compressor.
Furthermore, the layering height of the pouring unit is about 0.5m, and after pouring of each layer is finished, the second layer of pouring can be carried out after pouring and curing of the foamed light soil layer for 8 hours; pouring templates are arranged around the pouring units; every two adjacent pouring units should leave 2~5 mm's expansion joint. The pouring construction time of the pouring layer of the single pouring area does not exceed the initial setting time of cement paste; the pouring interval time of two adjacent upper and lower pouring layers is preferably more than 8 hours. Pouring is preferably carried out from the position close to the middle position of the long shaft of the pouring area to the two ends in the pouring direction; the discharge port is not suspended during the casting process.
The invention has the beneficial effects that:
1) the cement consumption is low, the internal hydration heat is low, and the surface cracking of the foamed lightweight soil caused by hydration temperature rise is avoided; the consumption of cement is reduced, so that the shrinkage rate of the foamed lightweight soil is reduced, the volume stability is improved, and the durability is improved; in addition, the cement has small dosage, low cost and extremely high economical efficiency; compared with the conventional foam lightweight soil with the same wet density, the cement dosage is generally 50 parts or even higher, while the cement dosage used in the invention is only 30 parts, so that the cement dosage is saved by more than 20%;
2) the invention uses a large amount of mineral powder and fly ash, which is not only beneficial to improving the volume stability of the foamed light soil, but also beneficial to improving the later strength of the foamed light soil; the foamed light soil belongs to a porous material and has good heat preservation, the hydration heat of cement can further accelerate the secondary hydration speed of mineral powder and fly ash, the later strength is favorably improved, and the later strength of the material composition can reach more than 2.5MPa and is far higher than the design strength of 1.0 MPa;
3) the novel foam light soil is suitable for large-size and large-area rapid construction, and for large roadbed filling materials, through early-stage modeling refinement and the adoption of a layered and partitioned construction scheme, multipoint simultaneous construction and ordered pouring can be facilitated, and the construction progress is accelerated;
4) the vehicle-mounted mobile type is adopted to prepare the foam light soil, so that the foam light soil is very suitable for being applied to large-scale track soft soil foundation engineering and a pouring mode with narrow site construction field and multi-point movement; fixing the bins of raw materials such as cement, mineral powder and fly ash in a place convenient for transportation, preparing slurry, and conveying the slurry to a front-end hopper of a vehicle-mounted mobile intelligent control system through a long-distance pipeline; the intelligent foaming machine of the control center directly blows foam into the foam slurry mixer, and after the foam slurry mixer is uniformly mixed, the foam slurry is pumped to the site for pouring through the short-distance pump, so that the damage of the foam during long-distance foam conveying is avoided, and the stability of the pouring quality of the foam light soil is ensured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention; the primary objects and other advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
FIG. 1 is a schematic diagram of a preparation process of a foamed lightweight soil material.
Detailed Description
Taking an intelligent network-connected automobile test field project as an example, the project is positioned at a riverside, and the track site is a natural riverside which is positioned at the first-level stage of the Yangtze river and belongs to a river accumulation plain geomorphologic unit, wherein the distance between the field and the left bank of the Yangtze river is about 2km, and the nearest point is about 50 m; a large number of longitudinal and transverse ditches and ponds are distributed in the field, the length of the ditches and the ponds is about 8453.7m, and the ditches and the ponds occupy 64.3% of the main track and the auxiliary track. The maximum thickness of a mud soil layer for geological exploration is 22.5m, and the maximum filling and digging height difference is 6.792 m. The field contains new and old river bed layers, the bearing capacity is low, the compressibility is high, and excessive settlement and uneven settlement are easily generated during loading.
The foundation of the racetrack is treated by singly or jointly mixing the mixing piles, the PHC tubular piles and the graded broken stone concrete, pile caps are arranged at the tops of all pile types, and the pile caps are connected with the upper foam light soil layer into a whole.
A large-scale racetrack soft soil foundation filling foam light soil material is prepared from the following raw materials in parts by weight: cement: 30-40 parts of mineral powder: 30-40 parts of fly ash: 30-50 parts of mixed composite reinforced foaming agent, 0.1-0.5 part of foam toughening agent and 60-70 parts of water.
Example one
The more preferable technical scheme is that the feed comprises the following raw materials in parts by weight: cement: 30 parts of mineral powder: 30 parts of fly ash: 40 parts of mixed composite reinforced foaming agent, 0.32 part of foam toughening agent and 60 parts of water. Suitable for long distance pumping of more than 100 m.
Specifically, the cement is P.O42.5 cement, the fly ash is F-class II-class cement, and the mineral powder is S95-class mineral powder prepared by grinding granulated blast furnace slag.
Specifically, the instant mixed composite reinforced foaming agent is an ether alcohol composite foaming agent, and comprises the following components in parts by weight: 2-20% of ether alcohol surfactant, 1-8% of amino acid surfactant, 0.1-1% of reinforcing agent, 0.01-1% of stabilizing agent and 70-93.89% of water.
Specifically, the foam toughening agent is polyalcohol amine, and is of analytical pure grade.
Example one
With reference to the process flow of fig. 1, the following materials were weighed according to the following weight ratio: cement: 30 parts of mineral powder: 30 parts of fly ash: 40 parts of the dry powder is added into a high-efficiency vortex type stirrer (a shaftless stirrer) to be uniformly mixed, 60 parts of water is added, and the dry powder is rapidly stirred into uniform slurry under the action of a vortex; the whole process is completed within 1 min.
And sending the prepared slurry into a front end hopper of a construction site vehicle-mounted mobile intelligent control system through a pumping pipeline.
Diluting 0.32 part of the ready-mixed composite reinforced foaming agent by 100 times of water, and then dropwise adding 0.01 part of foam toughening agent; setting the foam density at 50kg/m through a touch screen in a control center3The diluted foaming agent is directly blown into a foam slurry mixer for stirring.
Then controlThe density of the foam light soil is 600kg/m arranged on the touch screen of the center3The system automatically adjusts the material discharging speed of the slurry in the hopper to obtain the wet density of 600 +/-30 kg/m3Foamed light soil.
And pumping the prepared foamed light soil to a site for casting.
The foam slurry mixer is a horizontal physical mixer, and a stirrer with blades is strictly forbidden, otherwise, foam in the light soil is easily broken by stirring, and foaming performance is seriously influenced.
Because of the limitation of construction site conditions, the distance from the vehicle-mounted mobile intelligent foaming machine to the site pouring is more than 100m, and then a foam toughening agent must be added, so that the phenomenon that foam is broken and the wet density is greatly changed due to long-distance pumping is avoided.
Example two
The technical scheme is that the feed comprises the following raw materials in parts by weight: cement: 30 parts of mineral powder: 30 parts of fly ash: 40 portions of mixed composite reinforced foaming agent and 60 portions of water. Suitable for short distance pumping of less than 100 m.
Specifically, the cement is P.O42.5 cement, the fly ash is F class II, and the mineral powder is S95 grade mineral powder prepared by grinding granulated blast furnace slag.
Specifically, the mixed composite reinforced foaming agent is an ether alcohol composite foaming agent, and comprises the following components in parts by weight: 2-20% of ether alcohol surfactant, 1-8% of amino acid surfactant, 0.1-1% of reinforcing agent, 0.01-1% of stabilizing agent and 70-93.89% of water.
The preparation method for the foam light soil material filled in the large-scale track soft soil foundation is combined with the process flow of figure 1, and comprises the following steps:
weighing the following materials in percentage by weight: cement: 30 parts of mineral powder: 30 parts of fly ash: 40 parts of the dry powder is added into a high-efficiency vortex type stirrer (a shaftless stirrer) to be uniformly mixed, 60 parts of water is added, and the dry powder is rapidly stirred into uniform slurry under the action of a vortex; the whole process is completed within 1 min.
And sending the prepared slurry into a front end hopper of a construction site vehicle-mounted mobile intelligent control system through a pumping pipeline.
0.32 part of instant mixed composite reinforced foaming agentDiluting with 100 times of water; setting the foam density at 50kg/m through a touch screen in a control center3The diluted foaming agent is directly blown into a foam slurry mixer for stirring.
Then the density of the foamed light soil is 600kg/m arranged on a touch screen of the control center3The system automatically adjusts the material discharging speed of the slurry in the hopper to obtain the wet density of 600 +/-30 kg/m3Foamed light soil.
And pumping the prepared foamed light soil to a site for casting.
The foam slurry mixer is a horizontal physical mixer, and a stirrer with blades is strictly forbidden, otherwise, foam in the light soil is easily broken by stirring, and foaming performance is seriously influenced.
The embodiment is suitable for short-distance conveying of the vehicle-mounted mobile intelligent control system, wherein the distance from the vehicle-mounted mobile intelligent control system to the site pouring is less than 100 m.
EXAMPLE III
A novel foam light soil material applied to a large-scale racetrack soft soil foundation comprises the following raw materials in parts by weight: cement: 40 parts of mineral powder: 30 parts of fly ash: 30 portions of mixed composite reinforced foaming agent and 60 portions of water.
Specifically, the cement is P.O42.5 cement, the fly ash is F class II, and the mineral powder is S95 grade mineral powder prepared by grinding granulated blast furnace slag.
Specifically, the instant mixed composite reinforced foaming agent is an ether alcohol composite foaming agent, and comprises the following components in parts by weight: 2-20% of ether alcohol surfactant, 1-8% of amino acid surfactant, 0.1-1% of reinforcing agent, 0.01-1% of stabilizing agent and 70-93.89% of water.
The preparation method of the foam light soil material for filling the large-scale racetrack soft soil foundation by combining the process flow shown in the figure 1 comprises the following steps:
weighing the following materials in percentage by weight: cement: 40 parts of mineral powder: 30 parts of fly ash: 30 parts of the dry powder is added into a high-efficiency vortex type stirrer (a shaftless stirrer) to be uniformly mixed, 60 parts of water is added, and the dry powder is rapidly stirred into uniform slurry under the action of a vortex; the whole process is completed within 1 min.
And sending the prepared slurry into a front end hopper of a construction site vehicle-mounted mobile intelligent control system through a pumping pipeline.
Diluting 0.32 part of the instant mixed composite reinforced foaming agent by 100 times of water; setting the foam density at 50kg/m through a touch screen in a control center3The diluted foaming agent is directly blown into a foam slurry mixer for stirring.
Then the density of the foamed light soil is 600kg/m arranged on a touch screen of the control center3The system automatically adjusts the material discharging speed of the slurry in the hopper to obtain the wet density of 600 +/-30 kg/m3Foamed light soil.
And pumping the prepared foamed light soil to a site for casting.
The foam slurry mixer is a horizontal physical mixer, and a stirrer with blades is strictly forbidden, otherwise, foam in the light soil is easily broken by stirring, and foaming performance is seriously influenced.
The embodiment is suitable for short-distance conveying of the vehicle-mounted mobile intelligent control system, wherein the distance from the vehicle-mounted mobile intelligent control system to the site pouring is less than 100 m. The cement consumption is large, the cement is not economical, the hydration heat in the foamed light soil is high, the foamed light soil is easy to crack, but the hardening speed is high, and the compressive strength is high.
Example four
A novel foam light soil material applied to a large-scale racetrack soft soil foundation comprises the following raw materials in parts by weight: cement: 30 parts of mineral powder: 30 parts of fly ash: 40 portions of mixed composite reinforced foaming agent 0.32 portion, foam toughening agent 0.01 portion and water 70 portion.
Specifically, the cement is P.O42.5 cement, the fly ash is F class II, and the mineral powder is S95 grade mineral powder prepared by grinding granulated blast furnace slag.
Specifically, the instant mixed composite reinforced foaming agent is an ether alcohol composite foaming agent, and comprises the following components in parts by weight: 2-20% of ether alcohol surfactant, 1-8% of amino acid surfactant, 0.1-1% of reinforcing agent, 0.01-1% of stabilizing agent and 70-93.89% of water.
Specifically, the foam toughening agent is polyalcohol amine, and is of analytical pure grade.
The preparation method is applied to the preparation method of the foam light soil material for filling the large-scale racetrack soft soil foundation by combining the process flow shown in the figure 1, and is characterized by comprising the following steps:
weighing the following materials in percentage by weight: cement: 30 parts of mineral powder: 30 parts of fly ash: 40 parts of the dry powder is added into a high-efficiency vortex type stirrer (a shaftless stirrer) to be uniformly mixed, 70 parts of water is added, and uniform slurry is rapidly stirred under the vortex action; the whole process is completed within 1 min.
And sending the prepared slurry into a front end hopper of a construction site vehicle-mounted mobile intelligent control system through a pumping pipeline.
Diluting 0.32 part of the instant mixed composite reinforced foaming agent by 100 times of water; then 0.01 part of foam toughening agent is dripped; setting the foam density at 50kg/m through a touch screen in a control center3The diluted foaming agent is directly blown into a foam slurry mixer for stirring.
Then the density of the foamed light soil is 600kg/m arranged on a touch screen of the control center3The system automatically adjusts the material discharging speed of the slurry in the hopper to obtain the wet density of 600 +/-30 kg/m3Foamed light soil.
And pumping the prepared foamed light soil to a site for casting.
The foam slurry mixer is a horizontal physical mixer, and a stirrer with blades is strictly forbidden, otherwise, foam in the light soil is easily broken by stirring, and foaming performance is seriously influenced.
According to the embodiment, the flow value of the foamed light soil is large, the method is suitable for the vehicle-mounted mobile intelligent foaming machine, the distance from the vehicle-mounted mobile intelligent foaming machine to the site pouring is larger than 100m, and a small amount of foamed light soil is locally collapsed.
The four example embodiments, the related properties of the foamed lightweight soil are shown in the following table. Physical properties of the foamed lightweight soil: the test methods of the performances such as the flow value, the wet density, the compressive strength and the like refer to CECS 249-2008 technical Specification for cast-in-situ foam lightweight soil.
TABLE 1 comparison of the properties of the foamed lightweight soils of the four embodiments
By comparing the four schemes, the novel foam light soil material applied to the large-scale track soft soil foundation comprises the following optimal materials in parts by weight: cement: 30 parts of mineral powder: 30 parts of fly ash: 40 parts of mixed composite reinforced foaming agent 0.32 part, foam toughening agent 0.01 part and water 60 parts.
When the material is used in a construction site, the application of the foam light soil material for filling the large-scale racetrack soft soil foundation comprises the following specific steps:
step one, establishing a 3D model and refining the model according to a track design drawing, dividing the track into square or rectangular pouring units by adopting vertical layering and horizontal framing, wherein the area of a single pouring unit is not more than 400m to the maximum2At 200m2～30O m2Preferably; the casting height is controlled to be 0.5 m. The pouring units are sequentially marked and the central point and the four corner points are marked; and 2-5 mm expansion joints are reserved between adjacent pouring units, and the expansion joints of the upper layer and the lower layer are staggered. The side line of the pouring unit adapts to the design of a construction joint;
secondly, arranging temporary stations of a vehicle-mounted mobile intelligent control system on one side or two sides of the track, and measuring and calculating the distance from the station to the farthest point of the pouring unit, wherein the distance is 100m and is a dividing point; when the distance is more than 100m, the foam toughening agent is added when the foam is prepared.
Wherein the layered height of the pouring unit is about 0.5m, and the area of the plane area is not more than 400m2(ii) a After pouring of each layer is finished, pouring and maintaining the foamed light soil of the layer for 8 hours, and then pouring of a second layer can be carried out; pouring templates are arranged around the pouring units; every two adjacent pouring units should leave 2~5 mm's expansion joint. The pouring construction time of the pouring layer of the single pouring area does not exceed the initial setting time of cement paste; the pouring interval time of two adjacent upper and lower pouring layers is preferably more than 8 hours. Pouring is preferably carried out from the position close to the middle position of the long shaft of the pouring area to the two ends in the pouring direction; the discharge port is not suspended during the casting process. The pouring template is made of a concrete plate or a thin steel plate, and a rough surface is arranged on the pouring side; concrete slabs or sheet steel are fixed inside the foamed lightweight soil as stiffening ribs.
And step three, laying a conveying pipeline. Adopt the pipeline to carry from the interim website of on-vehicle portable intelligent control system to the pouring scene, the pipeline links to each other with the delivery pump, and the delivery pump is equipped with pressure gauge, flowmeter and flow control valve, and controls through the remote control end.
And step four, establishing a storage bin for cement, mineral powder, fly ash and water in a flat site, and preparing a slurry stirrer with accurate measurement. The uniformly mixed slurry is pumped into a front end hopper of a vehicle-mounted mobile intelligent control system; the center of the hopper is provided with a planetary mixer with a slow rotating speed of 10-30 r/min, so that the slurry is prevented from settling and layering in the hopper.
Step five, a foaming agent storage chamber is arranged in the vehicle-mounted mobile intelligent control system, when the foaming agent is used, the stock solution is diluted by 100 times, and then the intelligent control system is provided with foam density of 50kg/m through a touch screen3And directly blowing the diluted foaming agent into the corresponding slurry amount through an air compression pump, and mixing in a foam slurry mixer, thereby preparing the foamed lightweight soil meeting the design requirements.
The vehicle-mounted mobile intelligent control system comprises a control room, a vehicle-mounted front hopper, a foaming agent storage room and a foam slurry mixer, which are all loaded by an automobile or a truck; the vehicle-mounted front hopper, the foaming agent storage chamber and the foam slurry mixer are all controlled in the process through a control panel of the control chamber, wherein the foaming agent storage chamber also comprises an air compressor, and the size and the quantity of foaming in the foaming agent are ensured by controlling the air speed and the pressure of the air compressor.
And sixthly, during pouring, the vehicle-mounted mobile intelligent control system moves to a temporary station, qualified foamed light soil is pumped to be poured from the center of the pouring unit to the periphery, and a skip method is adopted for construction, the foundation of the track is treated by a single or combined stirring pile, a PHC (prestressed high-strength concrete) pipe pile and a pouring pile, graded broken stones are arranged at the tops of all pile types, reinforcing mesh sheets are paved on the graded broken stones and connected with the foamed light soil layer at the upper part into a whole, and then the pouring of the foamed light soil layer on the whole track is finished.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the proportioning parameters and process flow of the present invention, and the material composition and preparation method thereof are all within the scope of the claims of the present application. The scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention described herein are intended to be covered thereby.
Claims (10)
1. The foam light soil material for filling the large-scale racetrack soft soil foundation is characterized by comprising the following raw materials in parts by weight: cement: 30-40 parts of mineral powder: 30-40 parts of fly ash: 30-50 parts of mixed composite reinforced foaming agent, 0.1-0.5 part of foam toughening agent and 60-70 parts of water;
the mixed composite reinforced foaming agent is an ether alcohol composite foaming agent and comprises the following components: 2-20% of ether alcohol surfactant, 1-8% of amino acid surfactant, 0.1-1% of reinforcing agent, 0.01-1% of stabilizing agent and 70-93.89% of water.
2. The large-scale racetrack soft soil foundation filling foam lightweight soil material as claimed in claim 1, is characterized by comprising the following raw materials in parts by weight: cement: 30 parts of mineral powder: 30 parts of fly ash: 40 parts of mixed composite reinforced foaming agent 0.32 part, foam toughening agent 0.01 part and water 60 parts.
3. The large-scale racetrack soft soil foundation filling foam lightweight soil material as claimed in claim 1, wherein the cement is P.O42.5 cement, the fly ash is class F class II, and the mineral powder is S95 grade mineral powder prepared by grinding granulated blast furnace slag.
4. The large-scale racetrack soft soil foundation filled with the foam lightweight soil material as claimed in claim 1, wherein the foam toughening agent is polyalcohol amine, and the analytical grade is pure.
5. A method for preparing a large-scale racetrack soft soil foundation filling foam lightweight soil material according to any one of claims 1 to 4, characterized by comprising the following specific steps:
step one, weighing the following materials in parts by weight: cement: 30 parts of mineral powder: 30 parts of fly ash: 40 parts, weighing the dry powder, adding the dry powder into a high-efficiency vortex type stirrer, uniformly mixing, adding 60 parts of water, rapidly stirring into uniform slurry under the action of a vortex, and completing the whole process within 1 min;
secondly, the prepared slurry is sent into a front end hopper of a building site vehicle-mounted mobile intelligent control system through a pumping pipeline;
diluting 0.32 part of the instant mixed composite reinforced foaming agent by using 100 times of water, and then dropwise adding 0.01 part of foam toughening agent; setting the foam density at 50kg/m through a touch screen in an intelligent control center3Directly blowing the diluted foaming agent into a foam slurry mixer for stirring;
fourthly, setting the density of the foamed light soil to be 600kg/m on a touch screen of the intelligent control center3The system automatically adjusts the material discharging speed of the slurry in the hopper to obtain the wet density of 600 +/-30 kg/m3Foamed light soil;
and step five, pumping the prepared foamed lightweight soil to a site for pouring, thereby completing the preparation of the foamed lightweight soil material.
6. The method for preparing a large-scale racetrack soft soil foundation filled with foam lightweight soil material according to claim 5, wherein in the third step, the foam slurry mixer is a horizontal physical mixer, and a diversion guide blade is welded on a central shaft, so that slurry and foam rapidly pass through the mixer under the designed pressure due to good slurry flowability, and the mixing of slurry and foam is completed.
7. The method for preparing the foam light soil material for filling the large-scale racetrack soft soil foundation according to claim 5, wherein for the pumping in the step five, the distance from a vehicle-mounted mobile intelligent control system to the site pouring is not more than 100m, and the pumping is performed in a short distance, so that the foam is not broken, and the wet density is changed in a small range or is not changed; and if the distance from the vehicle-mounted mobile intelligent control system to the site pouring is more than 100m due to road construction, adding a foam toughening agent during foam preparation.
8. The application of the foam light soil filling material for the large-scale racetrack soft soil foundation is characterized by comprising the following specific steps of:
step one, establishing a 3D model and refining the model according to a track design drawing, dividing the track into square or rectangular pouring units by adopting vertical layering and horizontal framing, wherein the area of a single pouring unit is not more than 400m to the maximum2At a distance of 200m2～30O m2Preferably; the pouring height is controlled to be 0.5 m; the pouring units are sequentially marked and the central point and the four corner points are marked; 2-5 mm expansion joints are reserved between adjacent pouring units, and the expansion joints of the upper layer and the lower layer are arranged in a staggered manner; the side line of the pouring unit adapts to the design of a construction joint;
secondly, arranging temporary stations of a vehicle-mounted mobile intelligent control system on one side or two sides of the track, and measuring and calculating the distance from the station to the farthest point of the pouring unit, wherein the distance is 100m and is a dividing point; when the distance is more than 100m, adding a foam toughening agent during foam preparation;
laying a conveying pipeline; the method comprises the following steps that pipeline conveying is adopted from a temporary station of the vehicle-mounted mobile intelligent control system to a pouring site, a pipeline is connected with a conveying pump, and the conveying pump is provided with a pressure gauge, a flow meter and a flow control valve and is controlled through a remote control end;
fourthly, a storage bin for cement, mineral powder, fly ash and water is built in a flat site, and a slurry stirrer with accurate measurement is equipped; the uniformly mixed slurry is pumped into a front end hopper of a vehicle-mounted mobile intelligent control system; a planetary stirrer with a slow rotating speed is arranged in the center of the hopper, and the rotating speed is 10-30 r/min, so that slurry is prevented from settling and layering in the hopper;
step five, a foaming agent storage chamber is arranged in the vehicle-mounted mobile intelligent control system, when the foaming agent is used, the stock solution is diluted by 100 times, and then the intelligent control system is provided with foam density of 50kg/m through a touch screen3Directly blowing the diluted foaming agent into the corresponding slurry amount through an air compression pump, and mixing in a foam slurry mixer, thereby preparing the foam light soil meeting the design requirements;
when pouring, the vehicle-mounted mobile intelligent control system moves to a temporary station, pumping qualified foamed light soil to pour from the center of the pouring unit to the periphery, and constructing by adopting a skip method; the foundation of the track is treated by the single or combined treatment of the mixing pile, the PHC tubular pile and the cast-in-place pile, graded broken stones are arranged at the tops of all pile types, a layer of steel wire mesh is laid on the graded broken stones and is connected with the upper foamed light soil layer into a whole until the pouring of the foamed light soil layer on the whole track is finished.
9. The use of a large racecourse soft soil foundation filled with a foamed lightweight soil material according to claim 8, wherein the vehicle-mounted mobile intelligent control system comprises a control room, a vehicle-mounted front hopper, a foaming agent storage room and a foam slurry mixer, all of which are carried by a car or truck; the vehicle-mounted front hopper, the foaming agent storage chamber and the foam slurry mixer are all controlled in the process through a control panel of the control chamber, wherein the foaming agent storage chamber also comprises an air compressor, and the size and the quantity of foaming in the foaming agent are ensured by controlling the air speed and the pressure of the air compressor.
10. The use of the foam lightweight soil material for filling a large-scale racetrack soft soil foundation according to claim 8, wherein the height of each layer of pouring units is about 0.5m, and after the pouring of each layer is finished, the second layer of pouring can be carried out after the pouring and maintenance of the layer of foam lightweight soil are carried out for 8 hours; pouring templates are arranged around the pouring units; 2-5 mm expansion joints are reserved between every two adjacent pouring units; the pouring construction time of the pouring layer of the single pouring area does not exceed the initial setting time of cement paste; the pouring interval time of two adjacent upper and lower pouring layers is preferably longer than 8 hours; pouring is preferably carried out from the position close to the middle position of the long shaft of the pouring area to the two ends in the pouring direction; the discharge port is not suspended during the casting process.
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| CN103469701A (en) * | 2013-08-30 | 2013-12-25 | 浙江省建工集团有限责任公司 | Construction method for preparing foamed light soil in site in integrated form to fill substructure of high-speed rail |
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| CN103469701A (en) * | 2013-08-30 | 2013-12-25 | 浙江省建工集团有限责任公司 | Construction method for preparing foamed light soil in site in integrated form to fill substructure of high-speed rail |
| CN110983892A (en) * | 2019-12-25 | 2020-04-10 | 广东冠新建设有限公司 | Foamed light soil and pouring construction process thereof |
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Application publication date: 20220531 |