CN101717227A - High-performance concrete for plate-type ballastless track of high-speed railway passenger dedicated line - Google Patents
High-performance concrete for plate-type ballastless track of high-speed railway passenger dedicated line Download PDFInfo
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- CN101717227A CN101717227A CN200910206473A CN200910206473A CN101717227A CN 101717227 A CN101717227 A CN 101717227A CN 200910206473 A CN200910206473 A CN 200910206473A CN 200910206473 A CN200910206473 A CN 200910206473A CN 101717227 A CN101717227 A CN 101717227A
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Abstract
The high-performance concrete for the plate-type ballastless track of the passenger dedicated line of the high-speed railway consists of cement, mineral powder, fly ash, fine aggregate, coarse aggregate, an additive and water, and is characterized in that: 15 to 18 percent of cement, 1.5 to 2.5 percent of mineral powder, 0.8 to 1.5 percent of fly ash, 24 to 29 percent of fine aggregate, 44 to 49 percent of coarse aggregate, 1.2 to 1.5 percent of admixture and 5 to 5.7 percent of water. The invention has low production cost, improves the durability of the concrete structure, and the durability index meets the requirement of the national standard specification.
Description
One, technical field:
The invention belongs to the concrete Application Areas, particularly relate to and be applied to high-speed railway plate-type ballastless track CRTS-II template and manufacture.
Two, background technology
Along with the develop rapidly of high-speed railway, plate-type ballastless track is comfortable because of its driving, the application that fast obtains more and more widely easy to maintenance, and CRTS-II type track plate is one of primary structure form of plate-type ballastless track.
CRTS-II type track plate is China to the innovative product of the rich lattice plate of Germany, and concrete crushing strength was not less than 48Mpa when 16 hours prestress of manufacturing technique requirent was put.
For reaching the requirement of above production technique, Germany uses superfine cement when making rich lattice plate, and problem such as exist that production cost height, concrete are easy to crack, poor durability and domestic superfine cement output are limited is therefore inapplicable in China.When Beijing-Tianjin line plate-type ballastless track is constructed, China uses general purpose portland cement admixture specific complex type adulterant technology, 16 hours concrete crushing strengths that not only satisfied manufacturing technique requirent reach 48Mpa, problems such as poor durability have also been solved simultaneously, specific complex type adulterant is made up of ultrafine powders such as SILICA FUME and chemical activator, the hydration reaction speed of excited cement and the closely knit realization concrete of filling strong and raising concrete durability morning in concrete, but because main moiety---the price height of SILICA FUME of specific complex type adulterant, so production cost is still high.
And it is domestic when using common adulterant flyash and breeze concrete, substantially be used for general concrete works more, can not satisfy 16 hours concrete crushing strengths of CRTS-II type track plate and be not less than the 48Mpa manufacturing technique requirent, therefore invent and a kind ofly both tallied with the national condition, the common adulterant that price is cheap again is applied to CRTS-II type track board concrete proportioning and seems very urgent.
Three, summary of the invention
The technical issues that need to address of the present invention provide a kind of high-performance concrete for high-speed railway passenger special line plate type unballasted track, and production cost is low, improve the concrete structure durability energy, and durability index meet China's standard specifications requirement.
Technical solution of the present invention is: high-performance concrete for high-speed railway passenger special line plate type unballasted track, by cement, breeze, flyash, fine aggregate, coarse aggregate, admixture, water is formed, it is characterized in that: the shared weight percent of described cement is 15%～18%, the shared weight percent of breeze is 1.5%～2.5%, the shared weight percent of flyash is 0.8%～1.5%, the shared weight percent of fine aggregate is 24%～29%, the shared weight percent of coarse aggregate is 44%～49%, the shared gelling material weight percent of admixture is 1.2%～1.5%, and the shared weight percent of water is 5%～5.7%.
The present invention compared with prior art has following advantage: adopt common II type silicate cement (label is not less than 42.5) and common adulterant (breeze and flyash) and the compound use of chemical admixture, adjust gelling material compositely proportional and chemical admixture component, select suitable coarse-fine aggregate specification and compositely proportional, select suitable water consumption, adjust the aquation process of gelling material, optimize the inside concrete pore structure, by reducing various inside and external concrete defect, obtain meeting concrete temperature control index request and (solve the early water heat-transmission, improve early strength, meet the requirement that 16 hours concrete crushing strengths of production technique are not less than 48Mpa, hydration heat descends and the decline of plate core temperature during the demoulding, health is adopted the steam heating template to do and is supported), durability index meets the concrete mix that China's standard specifications requires, and guarantees that the concrete appearance light is attractive in appearance.
Adopt breeze (280 yuan/ton) and flyash (140 yuan/ton) to make adulterant and replace specific complex type adulterant (2000 yuan/ton), greatly reduce production cost; By the research of coupling mutually between the material, further optimize proportioning, guarantee the smooth and easy of technical process, reach the purpose that starting material are easy to get, concrete structure durability can improve, the concrete production cost reduces; Concrete strength grade is C55 among the present invention.
CRTS-II type track board concrete proportioning of the present invention is when satisfying design, code requirement, the work on the spot use properties is very good, and common blending concrete is than every cube cheap 103 yuan of admixture specially concrete, every block of plate is saved 350 yuan, can reduce the concrete production cost of CRTS-II template greatly.
Four, description of drawings
The concrete temperature rise curve that Fig. 1 laboratory collects;
The concrete temperature rise curve that Fig. 2 laboratory collects;
The concrete temperature rise curve that collects in Fig. 3 construction;
The concrete temperature rise curve that collects in Fig. 4 construction;
Fig. 5 working-yard records intensity change curve in time.
Five, specific embodiments
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
One of temperature rise curve that the selected breeze of selected II type silicate cement (label is not less than 42.5) admixture that Fig. 1 records for the laboratory and the proportioning of I level flyash are gathered, the various performance index of concrete meet the demands.
Two of the temperature rise curve that the selected breeze of selected II type silicate cement (label is not less than 42.5) admixture that Fig. 2 records for the laboratory and the proportioning of I level flyash are gathered, the various performance index of concrete meet the demands.
One of temperature rise curve that the selected breeze of selected II type silicate cement (label is not less than 42.5) admixture that Fig. 3 records for the working-yard and the proportioning of I level flyash are gathered, the various performance index of concrete meet the demands.
Two of the temperature rise curve that the selected breeze of selected II type silicate cement (label is not less than 42.5) admixture that Fig. 4 records for the working-yard and the proportioning of I level flyash are gathered, the various performance index of concrete meet the demands.
The intensity that Fig. 5 records for the working-yard is change curve in time.
Main raw material(s) preferred:
Described cement is II type silicate cement (label is not less than 42.5), and the difference of selecting main consideration cement minerals component for use of cement, its hydration rate have also determined the development of early age strength of concrete simultaneously to the influence of concrete temperature rise.Require hydration rate and the big plate temperature rise of simulation concrete and strength development moderate.
Described common adulterant is GBFS S95-S115 level and F class flyash I level; the main effect of adulterant is to improve concrete weather resistance by the density of improving concrete inner structure, and grating, the active principle of mainly investigating its particle form, powder system reach the influence to concrete mixture characteristic.
Described admixture is the non-retardation setting type polycarboxylic acid series additive of water-reducing rate at 25%-35%: the different components of admixture (diminishing, protect collapse, froth breaking, bleed) be related to the concrete mix workability and through the time change, bubble feature and air content through the time change, influence the aquation process of gelling material, the performance of maturing is played a crucial role.
Described fine aggregate is a river sand, fineness modulus 2.6～3.1.
Described coarse aggregate is the 5-20mm graded broken stone: coarse aggregate is related to the workability of intensity, Young's modulus and the concrete mix of maturing as concrete skeleton.
Aggregate is mainly investigated quality, surface characteristic, grain type, grating, fineness, dust or the silt content of material.Wherein coarse aggregate adopts that material is hard, the calcium carbonate rubble of cleaning surfaces.
Described water is clean tap water.
Table 1 is that the part of this proportioning selected materials mainly detects content
| Sequence number | Project | Cement | Flyash | Breeze | Admixture | Water |
| ??1 | Loss on ignition | ??1.82％ | ??1.44％ | ??1.51％ | ??/ | ??/ |
| ??2 | Alkali content | ??0.54％ | ??0.86％ | ??0.76％ | ??2.14％ | ??42.06mg/L |
| ??3 | ??SO 3 | ??/ | ??0.68％ | ??0.59％ | ??/ | ??/ |
| ??4 | ??Cl | ??0.021％ | ??0.010％ | ??0.019％ | ??0.05％ | ??52.35mg/L |
| ??5 | ??CaO | ??57.79％ | ??2.72％ | ??/ | ??/ | ??/ |
| ??6 | Free CaO | ??0.78％ | ??0.09％ | ??/ | ??/ | ??/ |
| ??7 | Fineness | ??/ | ??10.8％ | ??/ | ??/ | ??/ |
| ??8 | Water demand ratio | ??/ | ??91 | ??98 | ??/ | ??/ |
| ??9 | Activity index | ??/ | ??75 | ??101 | ??/ | ??/ |
| ??10 | Specific surface area | ??338m 3/kg | ??/ | ??442m 3/kg | ??/ | ??/ |
| ??11 | Water-reducing rate | ??/ | ??/ | ??/ | ??31.2 | ??/ |
On the basis of understanding every kind of material property, adjust concrete mixture characteristic by test increase and decrease water-cement ratio, sand coarse aggregate ratio and admixture, the concrete mix index is adhered to specification and processing requirement; Adjust the starting material component, solve the compatibility problem of main raw; Maturing intensity, Young's modulus, durability index are verified; Adjust various material proportions, select raw-material effective combination for use, make and meet the preliminary proportioning that every index request has the varying strength affluence again, be used for the production under Various Seasonal environment or the time limitation situation.
Table 2 is that the selected rubble of this proportioning, sand mainly detect content
| Project | Silt content | In clod contains | Voidage | Soundness | ??Cl - | The faller gill shape | Sulfide content | Organic content | Fineness modulus | Maximum particle diameter |
| Rubble | ??0.2 | ??0.1 | ??38 | ??1.0 | ??0.008 | ??3.5 | ??0.08 | Be shallower than reference colour | ??/ | ??20mm |
| Project | Silt content | In clod contains | Voidage | Soundness | ??Cl - | The faller gill shape | Sulfide content | Organic content | Fineness modulus | Maximum particle diameter |
| Sand | ??2.0 | ??0.1 | ??/ | ??2 | ??0.008 | ??/ | ??0.08 | Be shallower than reference colour | ??2.8 | ??/ |
Selected hydrated cementitious speed is moderate, and temperature rise meets the requirements, selected mineral powder granular exquisiteness, and the activity index height all plays a part good to early strength and weather resistance; Selected flyash level particle shape is good, and water-reducing effect is obvious, and concrete workability is good; Selected admixture adaptability is good, and by Molecular Structure Design, introducing has powerful functional monomer early, makes gelling material hydration rate equalization stable; Selected fine aggregate fineness is moderate, and grating is good, and particle surface is smooth, a little less than the water-absorbent.Selected coarse aggregate quality is hard, and grating is good, and particle shape is good, and silt content is low, and water-intake rate is low.
Because the stirring intensity of concrete agitation station stirrer is big in the actual production, and proportioning has been carried out further optimization, at first is volume and the component ratio of having adjusted admixture, has further improved the consistency of admixture and gelling material; The 2nd, adjust the sand coarse aggregate ratio of concrete mix according to the variation of aggregate, sand coarse aggregate ratio is controlled between 30%～40%, and the workability of concrete mix is improved, and has guaranteed the smoothness of construction technology, has improved the visual appearance of product.The 3rd, according to the initial temperature of environment temperature and humidity variation and concrete mix, under the prerequisite that satisfies concrete strength and life requirement, dynamically adjust water-cement ratio, water-cement ratio is controlled between 0.25～0.30.Curing temperature is controlled between 30 ℃～40 ℃.
The shared weight percent of described cement is preferably 16%～17%, the shared weight proportion of breeze per-cent is best 1.8%～2.2%, the shared weight percent of flyash is preferably 1%～1.2%, the shared weight percent of fine aggregate is preferably 26%～28%, the shared weight percent of coarse aggregate is preferably 46%～49%, and the shared gelling material weight percent of admixture is preferably 1.3%～1.5%.
The every performance index situation of concrete when table 3 testing laboratory and Workshop Production
| Project | Testing laboratory | Trial production | Remarks |
| The stirrer stirring intensity | A little less than | By force | |
| Admixture output (%) | ??1.5 | ??1.35-1.45 | |
| The initial slump (mm) | ??140 | ??180 | |
| The slump through the time lose | Slowly | Hurry up | |
| The concrete mix air content | ??2.0-2.5 | ??2.5-3.0 | |
| Plate core top temperature | ??53.9 | ??49.7 | Relevant with environment |
| 16h follows the tracks of maintenance intensity (MPa) | ??48.6 | ??50.3 | Relevant with concrete mix initial temperature etc. |
| 16h follows the tracks of maintenance bullet mould (GPa) | ??36.2 | ??37.6 | |
| The 28d mark is supported intensity (MPa) | ??83.5 | ??84.6 |
| Project | Testing laboratory | Trial production | Remarks |
| The 28d mark is supported and is played mould (GPa) | ??47.5 | ??49.2 | |
| The 28d mark is supported displacement flux (C) | ??948 | ??896 |
Claims (9)
1. high-performance concrete for high-speed railway passenger special line plate type unballasted track, by cement, breeze, flyash, fine aggregate, coarse aggregate, admixture, water is formed, it is characterized in that: the shared weight percent of described cement is 15%～18%, the shared weight percent of breeze is 1.5%～2.5%, the shared weight percent of flyash is 0.8%～1.5%, the shared weight percent of fine aggregate is 24%～29%, the shared weight percent of coarse aggregate is 44%～49%, the shared gelling material weight percent of admixture is 1.2%～1.5%, and the shared weight percent of water is 5%～5.7%.
2. high-performance concrete for high-speed railway passenger special line plate type unballasted track according to claim 1, it is characterized in that: the shared weight percent of described cement is preferably 16%～17%, the shared weight proportion of breeze per-cent is best 1.8%～2.2%, the shared weight percent of flyash is preferably 1%～1.2%, the shared weight percent of fine aggregate is preferably 26%～28%, the shared weight percent of coarse aggregate is preferably 46%～49%, and the shared gelling material weight percent of admixture is preferably 1.3%～1.5%.
3. high-performance concrete for high-speed railway passenger special line plate type unballasted track according to claim 1 is characterized in that: described cement is silicate cement.
4. high-performance concrete for high-speed railway passenger special line plate type unballasted track according to claim 1 is characterized in that: described breeze is the S95-S115 ground blast furnace slag.
5. high-performance concrete for high-speed railway passenger special line plate type unballasted track according to claim 1 is characterized in that: described flyash is I level flyash.
6. high-performance concrete for high-speed railway passenger special line plate type unballasted track according to claim 1 is characterized in that: described admixture is the non-retardation setting type polycarboxylic acid series additive of water-reducing rate at 25%-35%.
7. high-performance concrete for high-speed railway passenger special line plate type unballasted track according to claim 1 is characterized in that: described fine aggregate be in thick river sand, sand coarse aggregate ratio is between 30%～40%.
8. high-performance concrete for high-speed railway passenger special line plate type unballasted track according to claim 1, it is characterized in that: water-cement ratio is between 0.25～0.30.
9. high-performance concrete for high-speed railway passenger special line plate type unballasted track according to claim 1 is characterized in that: curing temperature is controlled between 30 ℃～40 ℃.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030507A (en) * | 2010-11-19 | 2011-04-27 | 天津城市建设学院 | Self-compacting micro-expanded steel tube concrete |
| CN102296533A (en) * | 2011-06-03 | 2011-12-28 | 浙江天晟梁板有限公司 | Double-doped prestressed concrete bridge beam slab |
| CN102407561A (en) * | 2011-08-18 | 2012-04-11 | 中铁十八局集团有限公司 | Pre-casting process for track board for high-speed railway |
| CN104140288A (en) * | 2013-05-08 | 2014-11-12 | 中国核工业二四建设有限公司 | Preparation technology of self-compacting concrete composite mineral admixture for nuclear power plant |
| CN104762850A (en) * | 2015-03-12 | 2015-07-08 | 中交一航局第四工程有限公司 | Optimization method of track bed slab concrete of CRTS I type double-block ballastless track |
| CN106966672A (en) * | 2017-05-04 | 2017-07-21 | 陈绪利 | Exempt from the production method and concrete special of steam-cured high-speed rail plate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1986481A (en) * | 2006-11-16 | 2007-06-27 | 天津大学 | Flexible reinforced cement concrete |
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2009
- 2009-11-13 CN CN200910206473A patent/CN101717227B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030507A (en) * | 2010-11-19 | 2011-04-27 | 天津城市建设学院 | Self-compacting micro-expanded steel tube concrete |
| CN102296533A (en) * | 2011-06-03 | 2011-12-28 | 浙江天晟梁板有限公司 | Double-doped prestressed concrete bridge beam slab |
| CN102407561A (en) * | 2011-08-18 | 2012-04-11 | 中铁十八局集团有限公司 | Pre-casting process for track board for high-speed railway |
| CN102407561B (en) * | 2011-08-18 | 2014-09-17 | 中铁十八局集团有限公司 | Pre-casting process for track board for high-speed railway |
| CN104140288A (en) * | 2013-05-08 | 2014-11-12 | 中国核工业二四建设有限公司 | Preparation technology of self-compacting concrete composite mineral admixture for nuclear power plant |
| CN104140288B (en) * | 2013-05-08 | 2016-05-18 | 中国核工业二四建设有限公司 | A kind of used in nuclear power station self-compacting concrete compounded mineral admixture preparing process |
| CN104762850A (en) * | 2015-03-12 | 2015-07-08 | 中交一航局第四工程有限公司 | Optimization method of track bed slab concrete of CRTS I type double-block ballastless track |
| CN106966672A (en) * | 2017-05-04 | 2017-07-21 | 陈绪利 | Exempt from the production method and concrete special of steam-cured high-speed rail plate |
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Effective date of registration: 20230419 Address after: 471000 Yard 2, Sidong Road, Chanhe District, Luoyang, Henan Patentee after: Henan Sitong Engineering Testing Co.,Ltd. Address before: 471013 No. 2 Courtyard of Sitong Road, Luoyang City, Henan Province Patentee before: CHINA RAILWAY 15TH BUREAU GROUP Co.,Ltd. |