CN106631152A - Method for making high-performance concrete for high-speed railway ballastless track through manufactured sand - Google Patents
Method for making high-performance concrete for high-speed railway ballastless track through manufactured sand Download PDFInfo
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- CN106631152A CN106631152A CN201611236475.6A CN201611236475A CN106631152A CN 106631152 A CN106631152 A CN 106631152A CN 201611236475 A CN201611236475 A CN 201611236475A CN 106631152 A CN106631152 A CN 106631152A
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- China
- Prior art keywords
- concrete
- sand
- temperature
- performance concrete
- ballastless track
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- C04B40/02—Selection of the hardening environment
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
-
- 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
- C04B40/02—Selection of the hardening environment
- C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
- E01B29/005—Making of concrete parts of the track in situ
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a method for making high-performance concrete for a high-speed railway ballastless track through manufactured sand. The method comprises quality requirement and control method of the manufactured sand used for the ballastless track high-performance concrete, mixed proportion design control, mixing process control, pouring and curing control, wherein the general principles such as low binding material content, low sand rate, low slump and high gas content are followed during mixed proportion design; good grading of the manufactured sand is required, the fineness modulus is controlled to 2.8-3.3, and the stone powder content in the washed manufactured sand is controlled to 5-8%; the mud content of the manufactured sand is controlled in a 'secondary processing' manner, namely that clean mother rock is firstly screened for performing aggregate processing, and then clean aggregate is selected for producing the manufactured sand, wherein the MB value detection result is required to be less than 1.40 during the mud content control of the manufactured sand. According to the process, the problem in the existing mountainous area that the cost is too high because high-performance concrete for CRTS-I type high-speed railway ballastless track base plates and roadbed slabs is prepared by generally adopting river sand is effectively solved.
Description
Technical field
The present invention relates to a kind of interval and yard (containing Cha Qu) unballasted track bed plate and road bed board high performance concrete work
Skill, it is adaptable to the construction site of Bi-Block Slab Track in High Speed Railway bedplate and road bed board.
Background technology
High-speed railway interval and yard (containing Cha Qu) unballasted track bed plate and railway roadbed board concrete are a kind of quality controls
The high performance concrete having high demands, design strength is C40T2, it is desirable to which aggregate is evenly distributed, without isolation bleeding（That is concrete cast
Uniform state should be in after vibration compacting）, the later stage is without cracking, good endurance etc..Concrete Quality Control for convenience, at present
Generally prepared using river sand, mountain area is rare due to river sand, concrete production cost is too high.Artificial sand material source is widely distributed, processing
Cost of transportation is relatively low, but due to being affected by many factors, the concrete of preparation will reach above-mentioned requirements many difficulties, except
Outside possessing the artificial sand of stable performance to ensure concrete quality, in addition it is also necessary to ripe construction technology.Artificial sand high-performance
The construction quality of concrete is inseparable with concrete self performance and construction technology etc..From the point of view of site operation situation, be from
Artificial sand crudy and control method, mix-design control, to mix and stir process control, cast, this five aspect of maintenance control next
Ensure the construction quality of concrete.
The content of the invention
The technical problem to be solved in the present invention is：A kind of artificial sand is provided and prepares ballastless track of high-speed railway high-performance coagulation
Earth process, with overcome mountain construction present in prior art generally using river sand prepare the type high-speed railway double-block types of CRTS- I without
The deficiency such as high cost caused by tiny fragments of stone, coal, etc. rail bed plate and road bed board high performance concrete.
Technical scheme proposed by the present invention is：It is required with artificial chiltern amount and is controlled including non-fragment orbit high performance concrete
Method processed, mix-design are controlled, mix and stir process control, cast, maintenance control；Low glue material, low sand are observed during mix-design
Rate, low slump, the overall principle of high air content；Artificial sand requires level with good, modulus of fineness control 2.8～3.3, manually
Content of stone powder is controlled 5%～8% after sand washing；The clay content of artificial sand is controlled using " secondary operation " mode, i.e., first screens dry
Net parent rock carries out rubble processing, then carries out artificial sand production again from clean rubble；The control of artificial sand clay content is required
MB values testing result is less than 1.40.
Preferential using heating to mixing water during winter construction, the water temperature after heating is controlled at 50 DEG C～70 DEG C；
Rubble, sand shift to an earlier date 2 days and are put into feed bin, mix and stir that front temperature is not less than 0 DEG C, additive is placed on storehouse inside holding and do not crystallize；During stirring
Between extend 50% compared with normal temperature construction, actual control is in 3min.
Concrete out-of-machine temperature is not less than 10 DEG C；Strength grade is C40 water-binder ratio≤0.40, and slump control exists
Below 140mm, air content is controlled 3.0～4.0%.
Under conditions of environment temperature is more than 30 DEG C, the slump is not more than 160mm.
Concrete coordinates hopper construction using straddle truck；Summer pours selection of time in every daily temperature relatively low time period, pours
Environment temperature is built no more than 30 DEG C；Winter was selected in every daily temperature higher time period, when ambient air temperature is less than 3 DEG C, should be stopped
Only roadbed and bridge section non-fragment orbit concrete are poured into a mould.
Stratified continuous pouring is carried out during concreting, process of wiping one's face is carried out after pouring in time, number of times of wiping one's face is no less than 4
Time.
Concrete is reached after pre-hardening state, that is, start atomized water spray maintenance, when concrete final set, is changed to watering maintenance, and
And cover.
During concrete curing, it is desirable to which road bed board surface temperature is not less than 5 DEG C；When temperature is less than 5 DEG C, does not adopt and water
Natural curing method；When run into temperature for three days on end less than 5 DEG C, snow, freezing weather when, take addition cotton-wadded quilt, or set up guarantor
Warm canopy, or be equipped with firing equipment carry out it is warming, it is ensured that concrete is not endured cold.
By adopting above scheme, solve mountain construction and generally the type high-speed railway double-block types of CRTS- I are prepared using river sand
High cost problem caused by unballasted track bed plate and road bed board high performance concrete, not only ensure that high performance concrete
Quality, and greatly reduce concrete production cost.
Specific embodiment
Embodiments of the invention：This technique includes interval and yard (containing Cha Qu) non-fragment orbit high performance concrete with manually
Sand quality requirement and quality of production control method, mix-design are controlled, mix and stir process control, cast, maintenance control.Specifically such as
Under：
Firstth, the level of sand is with the whether reasonable combination property for directly influencing concrete batching system.Rational sand level is matched somebody with somebody, can be with
The water consumption of mix is reduced, mobility, uniformity and density preferably concrete is obtained, while reach saving cement
Effect.Concrete workability using especially thick sand mixing is poor, and mix is easily separated, and concrete water bleeding is larger, adopts
Although the concrete workability that fine sand or ultra fine sand are prepared is good, its specific surface area is big, and Water usage and cement amount increase, and mix
Solidifying soil is easy to crack.And adopt modulus of fineness good for 2.8～3.3 grades of concrete workabilities with good medium coarse sand mixing, by force
Degree is also higher.
Because non-fragment orbit concrete combination property has high demands, cement amount is not high during mix-design.Stone flour is used as one
Inert material is planted, fineness very little not only supplements the fine grained lacked in concrete, reduces bleeding and isolation；And stone flour
Slurry with glue material forms flexibility, increased the slurry amount of concrete, improve the workability of concrete；Stone flour is controlled 5%～8%
Less are affected on the properties of concrete；If being less than 5%, with the system of processing of current common configuration, washing must be just increased
Dynamics, the direct result for causing is that the modulus of fineness of sand can increase, and level can be produced not with substantially variation to the workability of concrete
The impact of profit；When more than 8%, can substantially increase the risk of later concrete cracking.
Secondth, containing mud all it is greatly injury to high performance concrete indices in artificial sand, not only intensity can be significantly
Bottom reduces, and durability cannot ensure at all, and the impact to additive is also clearly, causes concrete batching system workability
Difference, site operation is difficult.Therefore, the artificial sand that non-fragment orbit concrete construction is adopted need to strictly control clay content, i.e. MB values
Testing result is necessarily less than 1.40, is not otherwise allowed for non-fragment orbit concrete mixing.In order to preferably control containing for artificial sand
Mud amount, adopts " secondary operation " mode, control to make sand clay content by oneself, i.e., first screening clean parent rock carries out rubble processing, then
Artificial sand production is carried out from clean rubble, so as to avoid problem of the artificial sand containing mud.
3rd, in order to preferably control concrete quality, it is ensured that concrete durability, " three are had to comply with during mix-design
Low one high (low glue material, low sand coarse aggregate ratio, low slump, high air content）" the overall principle, scene using hanging coordinate hopper construction,
Pumping construction technique is not considered in principle.
4th, the concreting in cold weather preferentially employs and mixing water is heated, the water temperature control after heating
System is at 50 DEG C～70 DEG C.
Rubble, sand also take measures ensure its do not endure cold, temperature more than 0 DEG C, in order to ensure into the aggregate of mixer
Without ice cube, snow group.All material need to shift to an earlier date 2 days and be put into feed bin.Feed bin draining is unobstructed, it is impossible to produce seeping phenomenon, sleet sky
Gas forbids charging.
Additive is placed in storehouse and is incubated, it is ensured that additive is not crystallized, and forbids taking direct heating measure.
Proper extension concrete mixing time, mixing time extends 50% compared with normal temperature construction, and actual control is in 3min.
Appropriate adjustment feeding sequence, is sequentially the water for first throwing aggregate and heated, after stirring, adds water mud stirring.
Heated water is avoided to produce " false set " phenomenon with cement directly contact.
Plus the monitoring of reinforced concrete out-of-machine temperature, it is desirable to it is daily to be no less than 2 times per shift, when temperature is relatively low, per shift
No less than 3 times.Ensureing that concrete out-of-machine temperature is minimum can not be less than 10 DEG C.
Strictly detect machine concrete batching system performance, the water-cement ratio of selection of small（Strength grade is C40 concrete glues
Than≤0.40）And the slump, in below 140mm, under conditions of environment temperature is more than 30 DEG C, the slump is little for slump control
In 160mm.Air content is controlled 3.0～4.0%.
Strict control additive quality, from stay-in-grade product, makes between additive and cement and mineral admixture
With good compatibility, forbid using with the different additive of function.Plus the compatibility test of strength water-reducing agent and Binder Materials,
Changes in weather situation is paid close attention to, additive component is suitably adjusted according to environmental condition, and is carried out live match ratio and tested
Just allow to use after confirmatory test is qualified, emphasis ensures that water-reducing rate, air content and slump-loss meet and requires.
5th, summer pour selection of time in every daily temperature relatively low time period, pour environment temperature no more than 30 DEG C, the winter
Season was selected in every daily temperature higher time period, when ambient air temperature is less than 3 DEG C, if without targetedly antifreezing measures, should stop
Only roadbed and bridge section non-fragment orbit concrete are poured into a mould.When the concrete of mixing slump-loss occurs soon or rapid hardening etc. occurs now
As taking the measure such as be finely adjusted to admixture dosage in time, it is ensured that enter mould concrete quality.
Require to detect construction environment and concrete temperature on time in work progress, it is desirable to which per work team, observation is no less than 2 times, when
When running into special circumstances, the observation frequency is increased, at least ensure every two hours observational record 1 time.
When pouring, stratified continuous pouring is carried out, it is ensured that same position is completed by teams and groups' primary concreting.
The uniformity of the live cloth of strict control, forbids carrying out being drawn concrete with making rod firm by ramming, and carries out place of wiping one's face in time
Reason, number of times of wiping one's face is no less than 4 times, it is ensured that real outer beautiful in concrete.
6th, the strong of design requirement is reached within the age of regulation to ensure the non-fragment orbit concrete for having poured
Degree, and prevent contraction fissure, it is necessary to conscientiously carry out maintenance work.
After non-fragment orbit concrete reaches pre-hardening state, that is, start fog curing, when concrete final set, be changed to watering
Maintenance, and cover.Because non-fragment orbit concrete construction is related to the varying environments such as roadbed, bridge, tunnel, it is also desirable to for not
Same environment formulates maintenance process.When temperature is less than 5 DEG C, natural curing method of watering is not adopted.
Non-fragment orbit is adopted in road bed board, base plate face overlying lid geotextiles, and maintenance of sprinkling water.When running into temperature continuous 3
It less than 5 DEG C, snow, freeze etc. extreme weather when, take addition cotton-wadded quilt, set up roof insulating, and be equipped with the measures such as firing equipment
Carry out warming, it is ensured that concrete is not endured cold.
It is identical with mixing water need for curing concrete water, it is to avoid to cause concrete damage.
During concrete curing, it is desirable to which road bed board surface temperature is not less than 5 DEG C.
In a word, non-fragment orbit Performance of Artificial Sand High Performance Concrete construction is the very strong construction technology of a specific aim.With routine
Concrete construction method is compared, and quality requirement is high.Because the factors such as execution conditions restriction affect, construction equipment, the original for being adopted
Material, concrete mix, construction and management, construction method and normal concrete are different.Each link in construction
It is required for strict standard, earnestly implements, especially to control with raw material, mix-design, construction organization requirement is all very high, no
Then the construction quality of concrete cannot be guaranteed, and easily causes concrete construction difficulty, isolates uneven, cracking, poor durability
A series of problems, such as, can cause to directly affect to traffic safety from now on.But, as long as we strengthen links management, completely
The concrete for meeting design requirement can be produced with artificial sand, so as to reduce the purpose of cost.
Claims (8)
1. a kind of artificial sand prepares ballastless track of high-speed railway high performance concrete technique, it is characterised in that：It is included without tiny fragments of stone, coal, etc. rail
Road high performance concrete is required with artificial chiltern amount and control method, mix-design control, mixes and stirs process control, cast, foster
Shield control；During mix-design in accordance with low glue material, low sand coarse aggregate ratio, low slump, high air content the overall principle；Artificial sand requires level
With good, 2.8～3.3, content of stone powder is controlled 5%～8% after artificial sand washing for modulus of fineness control；Using " secondary operation "
Mode controls the clay content of artificial sand, i.e., first screening clean parent rock carries out rubble processing, is then entered again from clean rubble
Row artificial sand is produced；The control of artificial sand clay content requires that MB values testing result is less than 1.40.
2. artificial sand according to claim 1 prepares ballastless track of high-speed railway high performance concrete technique, and its feature exists
In：Preferential using heating to mixing water during winter construction, the water temperature after heating is controlled at 50 DEG C～70 DEG C；Rubble,
Sand shifts to an earlier date 2 days and is put into feed bin, mixes and stirs that front temperature is not less than 0 DEG C, additive is placed on storehouse inside holding and do not crystallize；Mixing time is more normal
Temperature construction extends 50%, and actual control is in 3min.
3. artificial sand according to claim 1 prepares ballastless track of high-speed railway high performance concrete technique, and its feature exists
In：Concrete out-of-machine temperature is not less than 10 DEG C；Strength grade is C40 water-binder ratio≤0.40, and the slump is controlled in 140mm
Hereinafter, air content is controlled 3.0～4.0%.
4. the artificial sand according to claim 1 or 3 prepares ballastless track of high-speed railway high performance concrete technique, its feature
It is：Under conditions of environment temperature is more than 30 DEG C, the slump is not more than 160mm.
5. artificial sand according to claim 1 prepares ballastless track of high-speed railway high performance concrete technique, and its feature exists
In：Concrete coordinates hopper construction using straddle truck；Summer pours selection of time in every daily temperature relatively low time period, pours environment
Temperature is no more than 30 DEG C；Winter was selected in every daily temperature higher time period, when ambient air temperature is less than 3 DEG C, should stop roadbed
With the cast of bridge section non-fragment orbit concrete.
6. artificial sand according to claim 1 prepares ballastless track of high-speed railway high performance concrete technique, and its feature exists
In：Stratified continuous pouring is carried out during concreting, process of wiping one's face is carried out after pouring in time, number of times of wiping one's face is no less than 4 times.
7. artificial sand according to claim 1 prepares ballastless track of high-speed railway high performance concrete technique, and its feature exists
In：Concrete is reached after pre-hardening state, that is, start atomized water spray maintenance, when concrete final set, is changed to watering maintenance, and is covered
Lid.
8. the artificial sand according to claim 1 or 7 prepares ballastless track of high-speed railway high performance concrete technique, its feature
It is：During concrete curing, it is desirable to which road bed board surface temperature is not less than 5 DEG C；When temperature is less than 5 DEG C, does not adopt and water certainly
So maintenance process；When run into temperature for three days on end less than 5 DEG C, snow, freezing weather when, take addition cotton-wadded quilt, or set up insulation
Canopy, or be equipped with firing equipment carry out it is warming, it is ensured that concrete is not endured cold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611236475.6A CN106631152A (en) | 2016-12-28 | 2016-12-28 | Method for making high-performance concrete for high-speed railway ballastless track through manufactured sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611236475.6A CN106631152A (en) | 2016-12-28 | 2016-12-28 | Method for making high-performance concrete for high-speed railway ballastless track through manufactured sand |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922236A (en) * | 2010-07-21 | 2010-12-22 | 中铁二十局集团第四工程有限公司 | The C50 made sand ultra-high pump concrete construction method |
| CN102797358A (en) * | 2012-08-31 | 2012-11-28 | 中铁二十局集团有限公司 | Construction technique for ultralow-temperature high-property concrete for railway construction in frigid areas |
| CN104416675A (en) * | 2013-09-02 | 2015-03-18 | 青岛兴河建材有限公司 | Manufacturing process of pre-tensioned prestressed centrifugal concrete square pile |
-
2016
- 2016-12-28 CN CN201611236475.6A patent/CN106631152A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922236A (en) * | 2010-07-21 | 2010-12-22 | 中铁二十局集团第四工程有限公司 | The C50 made sand ultra-high pump concrete construction method |
| CN102797358A (en) * | 2012-08-31 | 2012-11-28 | 中铁二十局集团有限公司 | Construction technique for ultralow-temperature high-property concrete for railway construction in frigid areas |
| CN104416675A (en) * | 2013-09-02 | 2015-03-18 | 青岛兴河建材有限公司 | Manufacturing process of pre-tensioned prestressed centrifugal concrete square pile |
Non-Patent Citations (2)
| Title |
|---|
| 刘娟红等: "《绿色高性能混凝土技术与工程应用》", 31 January 2011, 中国电力出版社 * |
| 谭洪光等: "《预拌混凝土使用技术》", 31 October 2015, 中国建材工业出版社 * |
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Application publication date: 20170510 |