CN104193259B - A kind of preparation method about high ferro roadbed cement stabilized graded macabam - Google Patents
A kind of preparation method about high ferro roadbed cement stabilized graded macabam Download PDFInfo
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- CN104193259B CN104193259B CN201410401926.1A CN201410401926A CN104193259B CN 104193259 B CN104193259 B CN 104193259B CN 201410401926 A CN201410401926 A CN 201410401926A CN 104193259 B CN104193259 B CN 104193259B
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Abstract
A kind of preparation method about high ferro roadbed cement stabilized graded macabam provided by the invention, comprise the following steps: determine that graded broken stone thickness is gathered materials ratio, take graded broken stone: more than 4.75mm is coarse aggregate, simple grain footpath is adopted to gather materials the mode of stage filling, and carry out the method for Mechanics Performance Testing CBR value respectively, observe CBR value Changing Pattern, determine the grating that final each particle diameter gathers materials; Below 4.75mm is fine aggregate, adopts the K value law theory of maximum density curve theory to calculate the grating of fine aggregate; Measured the method for CBR value by the mode increased progressively by mass gradient, determine that thickness is gathered materials ratio; Take the rubble of each particle diameter and mix; Using cement as gelling material, graded broken stone is as aggregate, and graded broken stone and cement, water are stirred and compaction moulding, maintenance, to obtain final product.Compared with the conventional method, roadbed is more reasonable with macadam gradating, and mechanical property improves, and improves the performances such as resisted shrinkage, antifatigue load, weather resistance simultaneously for the method.
Description
Technical field
The present invention relates to high-speed railway subgrade cement stabilized graded macabam construction field, a kind of preparation method about high ferro roadbed cement stabilized graded macabam is provided.
Background technology
Along with continuous quickening and the leap that is economic and science and technology of China's Reformation and development paces, the railway technology of China, especially high ferro technology sustained and rapid development, has embodied a concentrated reflection of the process that China railways traffic realizes great-leap-forward development, makes Chinese Railway Infrastructure aggregate level realize history and crosses over.High-speed railway subgrade is the basis of bearing track structure and train load, it is the important component part of railway engineering, except possessing except basic function, also additionally should meet the requirement of shock load during train high-speed cruising: there is enough intensity, rigidity, stability and weather resistance, the various situations that may occur when can bear normal construction and use.
At present, the most widely used high-speed railway subgrade material is cement stabilized macadam, and it is a kind of semirigid base material.Cement stabilized macadam makes aggregate with graded broken stone, adopt the gelling material of some amount and the space of enough grey volume of slurry filler aggregates, to pave abundant compacting by embedded squeezing action principle, intensity mainly relies on the embedded squeezing keying action principle between rubble, there are enough grey volume of slurry to come the space of filler aggregate simultaneously, form higher degree of compactness.Form the semi-rigid body of tabular after hardening of cement, the bearing capacity of roadbed can be improved, there is higher strength and stability, simultaneously impervious degree and frost resistance effect better.
Cement stabilized macadam is as semi-rigid material basic unit, its mechanical index such as intensity, the modulus of resilience occurs decaying gradually due to environment reason and iterative cycles load, also likely occurs that overall structure is destroyed because the factors such as construction quality make base material comparatively early reach design fatigue lifetime.Existing evaluation base material index has pressure and flexure index etc. at the bottom of basic unit's layer; Inevitably will there is fatigability destruction as the index of checking computations road structure design base material in pressure at the bottom of basic unit's layer, be huge economy and manpower loss concerning suspending traffic, excavating basic unit and redesign structure the reorganization and expansion in later stage and reconstruction, and also cascading effect is caused to society; And whether qualified with the early stage structure deteriorate of flexure index does not have very large dependency, flexure is little also very possible there is roadbed fatigure failure in early days.Flexure reduces on the contrary and reaches normal level after carrying out the process of envelope ice to road bed to have data to show.Thus flexure index cannot characterize the fundamental property such as weather resistance, cracking resistance, water stability of road structure and material, is therefore that shortage is rational using it as the standard that roadbed design and construction quality are considered.
Have studied cement aquation kinetic reaction process and thing phase composite, the connection of graded broken stone in compacting process, embedded squeezing, lock knot principle, disclose the effect of cement in graded broken stone present system; With military service performance and weather resistance for guiding, carry out material preferably, mixtures optimal design, develop and there is excellent mechanical performance, resisted shrinkage, antifatigue load, the method for design of high ferro ground cement stabilized grading crushed stones matrix material of endurance quality and technology of preparing.
Summary of the invention
Goal of the invention: in order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide the preparation method of the high ferro roadbed cement stabilized graded macabam of the excellent performances such as a kind of resisted shrinkage, antifatigue load, weather resistance.
Technical scheme: a kind of preparation method about high ferro roadbed cement stabilized graded macabam provided by the invention, comprises the following steps:
(1) determine that graded broken stone thickness is gathered materials ratio, take graded broken stone: more than 4.75mm is coarse aggregate, adopt simple grain footpath to gather materials the mode of stage filling, and carry out the method for Mechanics Performance Testing CBR value respectively, observe CBR value Changing Pattern, determine the grating that final each particle diameter gathers materials; Below 4.75mm is fine aggregate, adopts the K value law theory of maximum density curve theory to calculate the grating of fine aggregate; Measured the method for CBR value by the mode increased progressively by mass gradient, determine that thickness is gathered materials ratio; Take the rubble of each particle diameter and mix;
(2) using cement as gelling material, graded broken stone is as aggregate, and the graded broken stone of step (1) and cement, water are stirred and compaction moulding, maintenance, to obtain final product.
In step (1), the grating that in coarse aggregate, each particle diameter gathers materials is: particle diameter 4.75mm20.0%, particle diameter 9.5mm16.0%, particle diameter 13.2mm12.4%, particle diameter 16mm15.4%, particle diameter 19mm21.4%, 26.5mm14.8%; The grating that in fine aggregate, each particle diameter gathers materials is: particle diameter 0.075mm4.4%, particle diameter 0.15mm10.8%, particle diameter 0.3mm24.0%, particle diameter 0.6mm14.5%, particle diameter 1.18mm19.7%, particle diameter 2.36mm26.6%; The ratio of coarse aggregate and fine aggregate is 74.1:25.9.The present invention adopt macadam gradating scope in 0.075mm-31.5mm continuous grading, the requirement that rubble should meet " high-speed railway subgrade engineering construction quality standard for acceptance ".
In step (2), the mass ratio of graded broken stone, cement and water is (85 ~ 95): (3 ~ 7): (5 ~ 7).
In step (2), cement is the cement of P. II 52.5 label, and water is tap water.
In step (2), curing temperature is 20 ± 2 DEG C, maintain humidity more than 90%, and curing time is 7-28 days.
Beneficial effect: compared with the conventional method, roadbed is more reasonable with macadam gradating, and mechanical property improves, and improves the performances such as resisted shrinkage, antifatigue load, weather resistance simultaneously for the preparation method of high ferro roadbed cement stabilized graded macabam provided by the invention.
Preparation method about high ferro roadbed cement stabilized graded macabam provided by the invention, its mechanism is as follows: make aggregate with graded broken stone, adopt the gelling material of some amount and the space of enough grey volume of slurry filler aggregates, to pave abundant compacting by embedded squeezing action principle, intensity mainly relies on the embedded squeezing keying action principle between rubble, there are enough gelling material to come the space of filler aggregate simultaneously, form higher degree of compactness; Form the semi-rigid body of tabular after hardening of cement, the bearing capacity of roadbed can be improved, there is higher strength and stability, impervious degree and frost resistance effect better.
The present invention's gradation design method used is a kind of new gradation design method, the framework compact grating that skeleton and degree of compactness all meet service requirements is designed by the basic mechanical performance being easy to measure, compared with existing roadbed Detritus construction method, the research of the many-side such as comprehensive mechanical property, endurance quality, anti-deformation, by the performance study analysis of the aspects such as the ultimate compression strength of test water cement-stabilizing broken stone, dry shrinkage experiment, immersion and freezing and thawing test, draw best cement mixing content and best water-cement ratio more accurately.Hydrolysis product of cement CSH gel in cement stabilized graded macabam, Ca (OH) 2,
the increase of the hydrated products such as C4AFH13 defines the intensity of cement slurry; Then hydrated product continuation increase is filled with the space originally having water to occupy, and solid particulate is slowly close, and viscosity node increases, and network-like structure is constantly reinforced.
Accompanying drawing explanation
Fig. 1 is the Changing Pattern of cement stabilized graded macabam ultimate compression strength with the length of time of different cement mixing content.
Fig. 2 is the impact of cement dose on the shrinkage performance of cement stabilized graded macabam.
Embodiment
Below embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give detailed implementation process, but protection scope of the present invention is not limited to following embodiment.
In following examples, the formula of graded broken stone is: the ratio of coarse aggregate and fine aggregate is 74.1:25.9; Wherein, the grating that in coarse aggregate, each particle diameter gathers materials is: particle diameter 4.75mm20.0%, particle diameter 9.5mm16.0%, particle diameter 13.2mm12.4%, particle diameter 16mm15.4%, particle diameter 19mm21.4%, 26.5mm14.8%; The grating that in fine aggregate, each particle diameter gathers materials is: particle diameter 0.075mm4.4%, particle diameter 0.15mm10.8%, particle diameter 0.3mm24.0%, particle diameter 0.6mm14.5%, particle diameter 1.18mm19.7%, particle diameter 2.36mm26.6%.
Embodiment 1: take raw material by massfraction, the mass ratio of graded broken stone, label P II 52.5 cement, tap water is 90:5:5.Compaction moulding after abundant mixing, curing temperature is 20 ± 2 DEG C, maintain humidity more than 90%; 7d ultimate compression strength is 5.9MPa, 28d ultimate compression strength is 10.5MPa, and dry density is 2.28g/cm
3, the coefficient of shrinkage 0.35.
Embodiment 2: take raw material by massfraction, the mass ratio of graded broken stone, label P II 52.5 cement, tap water is 85:7:7.Compaction moulding after abundant mixing, curing temperature is 20 ± 2 DEG C, maintain humidity more than 90%; 7d ultimate compression strength is 7.5MPa, 28d ultimate compression strength is 101.1MPa, and dry density is 2.31g/cm
3, the coefficient of shrinkage 0.63.
Embodiment 3: take raw material by massfraction, the mass ratio of graded broken stone, label P II 52.5 cement, tap water is 95:3:6.Compaction moulding after abundant mixing, curing temperature is 20 ± 2 DEG C, maintain humidity more than 90%; 7d ultimate compression strength is 5.2MPa, 28d ultimate compression strength is 9.4MPa, and dry density is 2.25g/cm
3, the coefficient of shrinkage 0.29.
The cement stabilized graded macabam ultimate compression strength of different cement mixing content is shown in Fig. 1 with the Changing Pattern in the length of time, the early strength of cement stabilized macadam is very fast with the growth in the length of time as seen from the figure, will slowly be tending towards after arriving certain curing age relaxing, and cement mixing content is more, ultimate compression strength is higher.
Fig. 2 is shown in the impact of cement dose on the shrinkage performance of cement stabilized graded macabam, as seen from the figure, along with cement dose increases, drying shrinkage strain and the coefficient of shrinkage increase thereupon, especially, when cement dose is more than 5% ~ 6%, drying shrinkage strain and the coefficient of shrinkage sharply increase.
Claims (3)
1. about a preparation method for high ferro roadbed cement stabilized graded macabam, it is characterized in that: comprise the following steps:
(1) determine that graded broken stone thickness is gathered materials ratio, take graded broken stone: more than 4.75mm is coarse aggregate, adopt simple grain footpath to gather materials the mode of stage filling, and carry out the method for Mechanics Performance Testing CBR value respectively, observe CBR value Changing Pattern, determine the grating that final each particle diameter gathers materials; Below 4.75mm is fine aggregate, adopts the K value law theory of maximum density curve theory to calculate the grating of fine aggregate; Measured the method for CBR value by the mode increased progressively by mass gradient, determine that thickness is gathered materials ratio; Take the rubble of each particle diameter and mix;
(2) using cement as gelling material, graded broken stone is as aggregate, and the graded broken stone of step (1) and cement, water are stirred and compaction moulding, maintenance, to obtain final product.
Wherein, in step (1), the grating that in coarse aggregate, each particle diameter gathers materials is: particle diameter 4.75mm20.0%, particle diameter 9.5mm16.0%, particle diameter 13.2mm12.4%, particle diameter 16mm15.4%, particle diameter 19mm21.4%, 26.5mm14.8%; The grating that in fine aggregate, each particle diameter gathers materials is: particle diameter 0.075mm4.4%, particle diameter 0.15mm10.8%, particle diameter 0.3mm24.0%, particle diameter 0.6mm14.5%, particle diameter 1.18mm19.7%, particle diameter 2.36mm26.6%; The ratio of coarse aggregate and fine aggregate is 74.1/25.9.
2. a kind of preparation method about high ferro roadbed cement stabilized graded macabam according to claim 1, it is characterized in that: in step (2), the mass ratio of graded broken stone, cement and water is (85 ~ 95): (3 ~ 7): (5 ~ 7).
3. a kind of preparation method about high ferro roadbed cement stabilized graded macabam according to claim 1, it is characterized in that: in step (2), cement is the cement of P. II 52.5 label, and water is tap water.
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| CN104846702B (en) * | 2015-05-26 | 2016-09-28 | 中铁第五勘察设计院集团有限公司 | Graded broken stone water mixing mud packing course construction method |
| CN107311612A (en) * | 2017-06-28 | 2017-11-03 | 常州欣彬纺织品有限公司 | A kind of graded broken stone mixture |
| CN115453098A (en) * | 2022-08-22 | 2022-12-09 | 河北工业大学 | Cement stabilized macadam mix proportion optimization method based on field opening design |
Citations (5)
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|---|---|---|---|---|
| CN102021872A (en) * | 2010-09-20 | 2011-04-20 | 天津市市政工程研究院 | Vibration molding-based method for design of mix proportion of graded broken stones |
| CN102230870A (en) * | 2011-04-08 | 2011-11-02 | 长安大学 | Method for testing grading broken stone CBR numerical value |
| CN103113031A (en) * | 2013-02-28 | 2013-05-22 | 浙江理工大学 | Method for designing graded gravel mixtures by using filling coefficient process |
| CN103323322A (en) * | 2013-05-20 | 2013-09-25 | 东南大学 | Graded gravel California bearing ratio value determination method |
| CN103342483A (en) * | 2013-05-10 | 2013-10-09 | 长安大学 | Grading design method of skeleton dense structure for grading macadam base |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021872A (en) * | 2010-09-20 | 2011-04-20 | 天津市市政工程研究院 | Vibration molding-based method for design of mix proportion of graded broken stones |
| CN102230870A (en) * | 2011-04-08 | 2011-11-02 | 长安大学 | Method for testing grading broken stone CBR numerical value |
| CN103113031A (en) * | 2013-02-28 | 2013-05-22 | 浙江理工大学 | Method for designing graded gravel mixtures by using filling coefficient process |
| CN103342483A (en) * | 2013-05-10 | 2013-10-09 | 长安大学 | Grading design method of skeleton dense structure for grading macadam base |
| CN103323322A (en) * | 2013-05-20 | 2013-09-25 | 东南大学 | Graded gravel California bearing ratio value determination method |
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