CN114673056A - Cement-stabilized internal curing base layer for desert highway and construction method - Google Patents
Cement-stabilized internal curing base layer for desert highway and construction method Download PDFInfo
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- CN114673056A CN114673056A CN202210200696.7A CN202210200696A CN114673056A CN 114673056 A CN114673056 A CN 114673056A CN 202210200696 A CN202210200696 A CN 202210200696A CN 114673056 A CN114673056 A CN 114673056A
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- 238000010276 construction Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 47
- 239000004568 cement Substances 0.000 claims abstract description 38
- 239000000203 mixture Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 239000002250 absorbent Substances 0.000 claims abstract description 4
- 239000011347 resin Substances 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims abstract description 4
- 239000002985 plastic film Substances 0.000 claims description 7
- 229920006255 plastic film Polymers 0.000 claims description 7
- 238000005056 compaction Methods 0.000 claims description 6
- 239000004746 geotextile Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims 2
- 238000012423 maintenance Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 8
- 230000002745 absorbent Effects 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 230000006641 stabilisation Effects 0.000 abstract 4
- 238000011105 stabilization Methods 0.000 abstract 4
- 238000001723 curing Methods 0.000 description 11
- 238000005204 segregation Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/46—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing and placing the materials, e.g. slurry seals
- E01C19/47—Hydraulic cement concrete mixers combined with distributing means specially adapted for road building
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4806—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing
- E01C19/4813—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing the materials being simultaneously but separately applied binders and granular or pulverulent material
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/03—Arrangements for curing paving; Devices for applying curing means; Devices for laying prefabricated underlay, e.g. sheets, membranes; Protecting paving under construction or while curing, e.g. use of tents
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a cement stabilization type internal curing base layer for a desert highway, which adopts super absorbent resin (SAP) special for cement concrete and provides an internal curing technology for applying the SAP as an internal curing agent to cement stabilization type materials, wherein the SAP content is 1-3% of that of a gelled material, and the extra water requirement is 8-12 times that of the SAP material. The invention also provides a construction method of the cement stable type internal curing base layer of the desert highway, which comprises the following steps: mixing the mixture; transporting the mixture; paving the mixture; rolling the mixture; and (5) preserving the mixture. By adopting the method, the self-shrinkage of the cement stabilization can be greatly reduced, so that the early cracking is prevented, and the compressive strength and the cracking resistance of the cement stabilization are improved. Meanwhile, the water consumption for maintenance can be obviously reduced, and the utilization efficiency of water resources is greatly improved particularly in arid areas.
Description
Technical Field
The invention belongs to the technical field of building construction, relates to a cement stabilized base layer health preserving technology, and particularly relates to a cement stabilized inner curing base layer of a desert highway and a construction method.
Background
The cement stabilized semi-rigid base course of the highway has the characteristics of high strength, good stability and strong integrity, if the maintenance is not in place in the construction process, the base course is very easy to cause drying shrinkage cracks due to excessive dehydration in the maintenance period, the service performance of the cement stabilized material is seriously influenced, and the phenomenon is particularly common and very difficult to overcome in the highway construction process in arid and rainless desert areas. Therefore, the proper maintenance mode is the key point for ensuring the performance of the cement stable semi-rigid base layer of the highway, particularly in desert areas
At present, conventional health preserving mode mainly includes that permeable geotextile (geotechnique cloth, grass bag etc.) covers the maintenance of watering, the film covers the health preserving of moisturizing and sprays the emulsified asphalt permeable blanket, special basic unit health preserving agent or thin paste seal cover etc, first method need replenish moisture in good time and keep the humidity of basic unit, and the water demand can promote greatly under desert arid environment, back both take sealed form to keep the inside moisture of basic unit in order to provide the health preserving environment, it does not receive the influence of air dry and wet degree, but the vehicle in the construction is very big to this airtight layer destruction, in case the overburden appears damaging, the effect to basic unit's health preserving influences greatly, serious influence basic unit intensity and engineering quality. In consideration of the climate characteristics of high temperature and little rain in the desert area, the conventional curing method has obvious disadvantages when being used for curing the cement-stabilized base course of the highway in the desert area, and therefore, the development of a curing technology suitable for the cement-stabilized base course of the highway in the desert area is urgently needed.
The invention provides an internal curing technology for applying super absorbent resin (SAP) as an internal curing agent to cement stabilizing materials, which can greatly reduce the self-shrinkage of the cement stabilizing materials, thereby preventing early cracking and improving the compressive strength and the crack resistance of the cement stabilizing materials. Meanwhile, the water consumption for maintenance can be obviously reduced, and the utilization efficiency of water resources is greatly improved particularly in arid areas.
Disclosure of Invention
Aiming at the problem that the cement stabilized base course of the highway in the desert area lacks reasonable maintenance technology in the background technology, the invention provides the cement stabilized inner maintenance base course of the desert highway and the construction method, which can not only reduce the water for maintaining cement stabilized materials, but also increase the compressive strength of the base course and reduce the maintenance time.
The admixture amount and the strength of the cement-stabilized type internal curing and external doping SAP of the desert highway are as follows:
the addition amount of the externally doped SAP is 1-3% of that of the gelled material, the super absorbent resin special for cement concrete is adopted, the appearance is white powder, and the additional water requirement is 8-12 times that of the SAP material. The cementing material is 32.5-grade cement, and the mixing amount of the cementing material is 4-5%.
The invention relates to a construction method of a cement stabilized type internal curing base course of a desert highway, which comprises the following steps:
A. Mixing a mixture: centralized plant mixing (WBZ600) is adopted, a mixing machine is provided with a high-precision electronic automatic meter, a mixing plant is provided with a water metering device, an SAP material adding device is arranged at a stirring machine, an SAP material and a cementing material are added simultaneously, and the SAP material flow and the mixture production capacity are matched in advance. The mixing time is adjusted to be 2-3 times of that of the common water-stable material.
B. And (3) transporting the mixture: the transport vehicle adopts 30t or more dump trucks, and is covered with tarpaulin to prevent water loss.
C. Paving a mixture: when in paving, the side-standing steel die is adopted, the walking speed of the paver is controlled to be 1-1.5m/min, the paver slowly unloads materials after the skip car is jacked up, the material receiving amount of the paver is stable, and the feeding amount is stably increased and the paver slowly paves after the height of the spiral material distributor 2/3 is reached.
D. Rolling: the compaction combination of the base layer is adjusted according to the virtual paving thickness of the mixture and the actual measurement compaction degree is combined to properly adjust the compaction pass and the vibration parameters
F. And (3) preserving the mixture: and after the rolling is finished, covering the plastic film with a large width, immediately covering the plastic film with a layer of geotextile, and maintaining the plastic film without watering for 4-7 days.
Increasing the technical effect to be achieved by the invention or the advantages compared with the traditional technology.
Drawings
FIG. 1 is a schematic view of an SAP material addition apparatus;
FIG. 2 is a flow chart of an internal curing construction process;
FIG. 3 is a cement stable gravel classification chart for the examples and comparative tests.
Detailed Description
Example 1
The dosage of the externally doped SAP is 1% of the gelled material, and the additional water requirement is 10 times of that of the SAP material. The cementing material is 32.5-grade cement, and the mixing amount of the cementing material is 4.5 percent.
And the construction is carried out according to the following method:
1 mixing of mixtures
1.1, a vibrating double-mixing-cylinder mixer is adopted for construction, the mixing time is required to be not less than 30s according to a forced continuous mixing mode, and the uniformity of the mixture is improved. The vibration stirring is that a vibration excitation device is added on the basis of the common static stirring, so that the mixture is in a fluttering state in the mixing process, water films on the surfaces of cement and SAP aggregates can be damaged, and the cement and SAP particles can be rapidly and uniformly distributed.
1.2 when the mixture is mixed, the water content is properly adjusted according to the climate environment, and the water content is increased by 0.5 to 1.5 percent.
1.3 when the mixture is mixed, the dosage of the cement is preferably increased by 0.3 to 0.5 percent.
1.4 install anti-segregation baffle and "groined" finished product feed bin anti-segregation device additional at mixing station feed inlet department, avoid the segregation of finished product material in process of production.
1.5 the output of the mixer is preferably controlled to be about 80 percent of the maximum mixing capacity, and the uniformity of the mixture is improved by reducing the mixing speed and the output.
2 transporting the mix
2.1 it is "article font" to load around the dummy car when loading to install "forked tail" anti-segregation baffle additional at the dummy car afterbody, prevent effectively that the mixture from loading and unloading in-process segregation.
2.2 the mixture transport vehicle requires tarpaulin coverage to prevent the water loss of the mixture.
3 spreading of the mixture
3.1 before paving, properly sprinkling water on the lower bearing layer for wetting, and simultaneously, each paver is provided with a sprinkling barrel for sprinkling the positions of dead angles in front of the pavers.
3.2 when the water-stable layer is paved, in order to avoid the separation of the mixture, the ladder-team operation of the paver is adopted, and the consistency of the speed, the paving thickness, the loose paving coefficient, the cross slope, the flatness, the vibration frequency and the like is ensured.
3.3 the paving working surface should be provided with a specially-assigned person to process the mixture segregation, dig out local coarse aggregate pits and belts, and re-fill the pits and belts, and strictly forbid repairing at the aggregate gathering position in a mode of screening and scattering fine materials.
4 Rolling Mill
4.1 after the mixture is spread and shaped for more than 50 meters, rolling is carried out immediately, the surface of the mixture is kept wet all the time in the rolling process, and the rolling is carried out according to the principle of firstly being light and then being heavy, and firstly being slow and then being fast.
4.2 the straight line section is rolled from two sides to the middle, the ultra-high end is rolled from the inner side to the outer side, each rolling and the previous rolling are overlapped for 1/2 wheel widths, and the road roller is strictly prohibited from turning around or braking suddenly on the working face.
5 curing of the mixture
5.1 after the rolling is finished, covering the plastic film with a large width, immediately covering the plastic film with a layer of geotextile, and maintaining the health for 4-7 days without watering.
Example 2
The amount of the externally doped SAP is 2% of that of the gelled material, and the additional water requirement is 10 times that of the SAP material. The cementing material is 32.5-grade cement, and the mixing amount of the cementing material is 4.5 percent. Aggregate grading design was consistent with example 1.
Example 3
The amount of the externally doped SAP is 3% of that of the gelled material, and the additional water requirement is 10 times that of the SAP material. The cementing material is 32.5-grade cement, and the mixing amount of the cementing material is 4.5 percent. Aggregate grading design was consistent with example 1.
Comparative test
SAP materials are not added, the cementing materials are 32.5-grade cement, and the adding amount is 4.5 percent. Aggregate grade layout and construction method were consistent with example 1.
Unconfined compressive strength test detection
The comparison shows the advantages of the new technology provided by the invention by combining the above examples and comparative experiments.
Claims (7)
1. A cement stabilized type internal curing base layer for desert highway features that the super-absorbent resin (SAP) specially used for cement concrete is used and its external appearance is white powder.
2. The desert highway cement-stabilized type internal curing base layer according to claim 1, wherein the amount of the SAP added is 1-3% of the amount of the binding material, and the additional water demand is 8-12 times of the amount of the SAP material.
3. The cement stabilized type internal curing base layer for desert roads as claimed in claim 2, wherein the cementing material is 32.5 grade cement, and the mixing amount is 4-5%.
4. A construction method of a cement stabilized type internal curing base layer of a desert highway is characterized by comprising the following steps:
(1) mixing a mixture: an SAP material adding device is arranged at the position of the stirrer, and the SAP material and the cementing material are added at the same time and stirred by vibration.
(2) And (3) transporting the mixture: the transport vehicle adopts 30t or more dump trucks and is covered with tarpaulin to prevent water loss.
(3) Paving a mixture: when in paving, the side-standing steel die is adopted, the walking speed of the paver is controlled to be 1-1.5m/min, the paver slowly unloads materials after the skip car is jacked up, the material receiving amount of the paver is stable, and the feeding amount is stably increased and the paver slowly paves after the height of the spiral material distributor 2/3 is reached.
(4) Rolling: the compaction combination of the base layer is adjusted according to the virtual paving thickness of the mixture and the actual measurement compaction degree is combined to properly adjust the compaction pass and the vibration parameters
(5) And (3) preserving the mixture: after the rolling is finished, the plastic film with large width is firstly used for covering, and then a layer of geotextile is covered on the plastic film.
5. The method for constructing the cement stabilized type internal curing base layer in the desert highway as claimed in claim 4, wherein the mixing time in (1) is 2-3 times of that of common water-stable materials.
6. The method for constructing a cement stabilized base course for desert highway as claimed in claim 4, wherein the vibration agitation used in (1) is an additional exciting device based on the ordinary static agitation, which can break the water film on the surface of the cement and SAP aggregates, so that the cement and SAP particles are rapidly and uniformly distributed.
7. The method for constructing the cement stabilized inner curing base layer for the desert highway as claimed in claim 4, wherein the curing is carried out without watering in the step (5) for 4-7 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210200696.7A CN114673056A (en) | 2022-03-03 | 2022-03-03 | Cement-stabilized internal curing base layer for desert highway and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210200696.7A CN114673056A (en) | 2022-03-03 | 2022-03-03 | Cement-stabilized internal curing base layer for desert highway and construction method |
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| Publication Number | Publication Date |
|---|---|
| CN114673056A true CN114673056A (en) | 2022-06-28 |
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| CN202210200696.7A Pending CN114673056A (en) | 2022-03-03 | 2022-03-03 | Cement-stabilized internal curing base layer for desert highway and construction method |
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