CN111792893A - Cement stabilized macadam base and construction method thereof - Google Patents
Cement stabilized macadam base and construction method thereof Download PDFInfo
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- CN111792893A CN111792893A CN202010641201.5A CN202010641201A CN111792893A CN 111792893 A CN111792893 A CN 111792893A CN 202010641201 A CN202010641201 A CN 202010641201A CN 111792893 A CN111792893 A CN 111792893A
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- cement
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- stabilized macadam
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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
-
- 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
-
- 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
-
- 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
- E01C19/4826—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 aggregate mixed with binders
-
- 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
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
-
- 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
- E01C3/00—Foundations for pavings
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
Abstract
The invention discloses a cement stabilized macadam base and a construction method thereof, belonging to the technical field of pavement laying of highways, and comprising the following components: aggregate, cement, water, a high polymer mixture, magnetized polyvinyl alcohol fiber and serpentine asbestos powder; the paint is prepared by mixing the following components in percentage by mass: 4.5 percent of cement, 4.5 percent of water, 0.3 to 0.97 percent of polymer mixture, 0.6 to 3 percent of magnetized polyvinyl alcohol fiber, 1.5 percent of serpentine asbestos powder and the balance of aggregate. According to the invention, through the mutual matching among the designed high-molecular mixture, the magnetized polyvinyl alcohol fiber, the aggregate and the serpentine asbestos powder, the tensile strength of the cement stabilized macadam base layer can be effectively enhanced, the influence of the temperature, the humidity and the reaction effect exerted by a running vehicle due to the friction action on the base layer can be weakened to a certain extent, the cracking is avoided, and after the cracking within a certain extent, the pulling action of an external force can be continuously resisted, so that the cracking speed of the base layer is effectively slowed down.
Description
Technical Field
The invention belongs to the technical field of highway pavement laying, and particularly relates to a cement stabilized macadam base and a construction method thereof.
Background
The action principle of the cement stabilized macadam is as follows: the cement stabilized macadam takes graded macadam as aggregate, adopts a certain amount of cementing materials and enough mortar volume to fill the gap of the aggregate, and is paved and compacted according to the embedding and extruding principle. Its compactness is close to compactness, and its strength mainly depends on the embedding, squeezing and locking principle between broken stones, and at the same time it has enough mortar volume to fill the gap of aggregate. Its initial strength is high, and its strength can be quickly increased with age, so that it has high strength, good impermeability and good freezing resistance. The cement content of the cement stabilized macadam is generally 3% -6% of that of the mixture, the unconfined compressive strength of 7 days can reach 5.0Mpa, and the cement stabilized macadam is higher than other roadbed materials.
After the cement stabilized macadam survives, the macadam does not get muddy when meeting rain, has a solid surface, and is an ideal base material for high-grade pavements. For example, the patent of "a cement stabilized macadam foundation and a construction method thereof" (patent number: CN 110055846A) disclosed by Chinese patent network solves the technical problems that in order to avoid serious cracking of the foundation in the prior art, the cement mixing amount is reduced and controlled to be 3-5%. However, the cement can enhance the strength and stability of the cement stabilized base course, and the cement mixing amount is limited within 5%, so that the rigidity of the base course is relatively reduced, the technical problems are solved by the designed technologies such as the waterproof reinforcing agent, the high belite cement, the calcium sulphoaluminate-calcium oxide composite expanding agent, the construction method and the like, but the patent still has some defects, the tensile strength of the base course is not sufficiently enhanced, so that the base course is easy to deform under the action of temperature, humidity and friction of a running vehicle, cracks are generated in serious cases, and the speed of continuous cracking cannot be slowed down after the base course cracks, so that a cement stabilized macadam base course and the construction method thereof are urgently needed to solve the problems in the prior art.
Disclosure of Invention
The invention aims to: the cement-stabilized broken stone base layer and the construction method thereof are provided for solving the problems that the base layer is easy to deform and crack under the conditions of temperature, humidity and friction of a running vehicle due to the fact that the tensile strength of the base layer is not enhanced enough, and the base layer can not slow down the continuous cracking speed after cracking.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cement stabilized macadam foundation comprising the following components: aggregate, cement, water, a high polymer mixture, magnetized polyvinyl alcohol fiber and serpentine asbestos powder;
the paint is prepared by mixing the following components in percentage by mass: 4.5 percent of cement, 4.5 percent of water, 0.3 to 0.97 percent of macromolecular mixture, 0.6 to 3 percent of magnetized polyvinyl alcohol fiber, 1.5 percent of serpentine asbestos powder and the balance of aggregate.
As a further description of the above technical solution:
the polymer mixture comprises a polymer and high-molecular beneficial daub, and the particle size of the polymer mixture is 410-830 mu m, namely 20-40 meshes.
As a further description of the above technical solution:
the cement is PC32.5, the using amount is 3.0-6.0% (namely the ratio of the cement mass to the whole cement stable anti-cracking base material mass), the aggregate is basalt broken stone, and the diameter of the aggregate is 9.5-13.2 mm.
As a further description of the above technical solution:
the length of the serpentine asbestos powder is 100-200 mu m.
As a further description of the above technical solution:
the preparation method comprises the following preparation processes:
step S1: stirring and mixing cement stabilized macadam base layer components, installing an electronic dynamic meter on a bin of a stirrer, firstly putting cleaned and impurity-removed aggregate into the bin, guiding the aggregate into a stirring tank of the stirrer by using the bin after metering, repeating the operation method, and sequentially guiding a high-molecular mixture, cement and water into the stirring tank;
step S2: after the high molecular mixture, cement and water are led into a stirring tank for stirring for a period of time, a wind cylinder is utilized to sequentially and uniformly add the magnetized polyvinyl alcohol fibers and the serpentine asbestos powder into the stirring tank for stirring and mixing, and a meter is arranged on the wind cylinder, so that the flow of the magnetized polyvinyl alcohol fibers and the serpentine asbestos powder can be conveniently measured, and the cement-stabilized macadam base layer mixture is obtained;
step S3: detecting the water content of the mixture, determining the optimal water content and the maximum dry density under different material composition conditions by adopting a vibration compaction method, and performing heavy compaction verification test on the determined mixture with the optimal water content to find out a conversion coefficient, wherein the conversion coefficient is generally 1.02-1.03;
step S4: and immediately transporting the qualified mixture to a construction site through a transport tool, and covering the mixture by using a shelter in the transportation process.
As a further description of the above technical solution:
the pre-stirring time in the step S1 is 30-110S, and the stirring time in the step S2 is 220-360S.
A construction method of a cement stabilized macadam foundation comprises the following construction processes:
process S1: the mixed materials are stirred by the stirring tank and then loaded, the transport vehicle moves back and forth in the loading process to reduce the segregation of the mixed materials, the roadbed is cleaned firstly before the paving, then the watering and the moistening are carried out, the hopper is slowly lifted when the transport vehicle carries out the unloading, the hopper is stopped when the hopper is lifted to a half, the mixed materials are basically paved and then lifted, and the segregation caused by the unloading is reduced;
process S2: two spreading machines are used for synchronous spreading, the spreading speed is 0.8m/min, the phenomena of segregation and virtual spreading need to be eradicated for re-spreading, and personnel are arranged on site to control the on-site spreading thickness and loose spreading coefficient;
process S3: finishing a rolling forming process before the early-stage solidification time is reached, rolling for 2 times by a hammer double-steel-wheel road roller, removing static and returning shock, then performing strong shock for 4 times by two single-steel-wheel road rollers, performing light collection by the hammer double-steel-wheel road roller after 3 times of weak shock, and finally rolling for 3 times by a rubber-wheel road roller, wherein the condition of high temperature and quick water loss occurs in a construction site, and water should be timely supplemented to the mixture on one side by adopting water spraying equipment;
process S4: and (3) curing the molded test piece for 7 days under the specified conditions, carrying out a 7-day soaking unconfined compressive strength test, and calculating the average value and the deviation coefficient of the test results.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, through the mutual matching among the designed high-molecular mixture, the magnetized polyvinyl alcohol fiber, the aggregate and the serpentine asbestos powder, the tensile strength of the cement stabilized macadam base layer can be effectively enhanced, the influence of the temperature, the humidity and the reaction effect exerted by a running vehicle due to the friction action on the base layer can be weakened to a certain extent, the cracking is avoided, and after the cracking within a certain extent, the pulling action of an external force can be continuously resisted, so that the cracking speed of the base layer is effectively slowed down.
2. According to the invention, the designed serpentine asbestos powder and the serpentine asbestos powder, namely the warm stone powder have fibrous spatial structures, can provide framework support for a waterproof reinforcing agent, are beneficial to forming a hardening protective layer on the surface layer of a base layer and improving the waterproof protection effect on the base layer, the aggregate is basalt, the basalt is hard and has proper particle size, the surface of a mixture consisting of a high polymer mixture, magnetized polyvinyl alcohol fiber, the serpentine asbestos powder and water can be completely embedded, a crack reflection structure layer with a certain thickness can be formed, the reflection of cracks can be effectively inhibited, the high polymer has good high elastic deformation and viscoelasticity through the designed high polymer mixture, the high polymer has large adhesion force and good performance, and is convenient to construct, and the finally prepared base layer can show good compactness, The adhesive force and the overall strength are reduced, so that the generation of cracks is reduced, the tensile strength of a base material is improved, the consumed capability of crack expansion is increased, the drawing action of external force can be continuously resisted after micro cracks are generated, the toughness of the base is enhanced, the impact capability is improved, and the reduction of reflection cracks is facilitated.
3. According to the invention, through the designed magnetized polyvinyl alcohol fiber, the magnetized polyvinyl alcohol fiber enters the stirring tank, various ions are dissolved in water and are likely to be collided and driven by active charged particles in the water, the number of capillary holes can be reduced, the capillary water tension effect is weakened to a certain extent, and the fiber can continuously resist the drawing effect of external force after cracks are generated, so that the fiber plays a restraining role, and the anti-drying shrinkage performance is enhanced.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below clearly and completely in connection with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a cement stabilized macadam foundation comprising the following components: the aggregate is basalt which is hard, the selected particle size is proper, the aggregate can be completely embedded into the surface of the mixture consisting of the macromolecular mixture, the magnetized polyvinyl alcohol fiber, the serpentine asbestos powder and the water, and a crack reflecting structure layer with a certain thickness can be formed, so that the reflection of cracks can be effectively inhibited;
the paint is prepared by mixing the following components in percentage by mass: 4.5 percent of cement, 4.5 percent of water, 0.3 to 0.97 percent of macromolecular mixture, 0.6 to 3 percent of magnetized polyvinyl alcohol fiber, 1.5 percent of serpentine asbestos powder and the balance of aggregate.
Specifically, the polymer mixture comprises a high polymer and high polymer beneficial daub, the particle size of the high polymer mixture is 410-830 microns, namely 20-40 meshes, the high polymer has good high elastic deformation and viscoelasticity through the designed polymer mixture, the high polymer has large cohesive force and good impermeability, the construction is convenient, and the finally prepared base layer can show good compactness, cohesive force and overall strength, so that the generation of cracks is reduced, meanwhile, the tensile strength of the base layer material is improved, the consumed capacity of crack expansion is increased, the drawing effect of external force can be continuously resisted after micro cracks are generated, the toughness of the base layer is enhanced, the impact capacity is improved, and the reduction of reflection cracks is facilitated.
Specifically, the cement is PC32.5, the using amount is 3.0-6.0% (namely the ratio of the mass of the cement to the mass of the whole cement stable anti-cracking base material), the aggregate is basalt macadam, and the diameter of the aggregate is 9.5-13.2 mm.
Specifically, the length of the serpentine asbestos powder is 100-200 μm.
Specifically, the following preparation process is adopted:
step S1: stirring and mixing cement stabilized macadam base layer components, installing an electronic dynamic meter on a bin of a stirrer, firstly putting cleaned and impurity-removed aggregate into the bin, guiding the aggregate into a stirring tank of the stirrer by using the bin after metering, repeating the operation method, and sequentially guiding a high-molecular mixture, cement and water into the stirring tank;
step S2: after a high molecular mixture, cement and water are led into a stirring tank for stirring for a period of time, magnetized polyvinyl alcohol fibers and serpentine asbestos powder are sequentially and uniformly added into the stirring tank by using an air duct for stirring and mixing, the magnetized polyvinyl alcohol fibers enter the stirring tank through the designed magnetized polyvinyl alcohol fibers, various ions are dissolved in the water and are possibly collided and driven by active charged particles in the water, the number of capillary holes can be reduced, the tension action of capillary water is weakened to a certain extent, the fibers can continuously resist the drawing action of external force after cracks are generated and play a role in restraining the fibers, so that the dry shrinkage resistance is enhanced, a meter is arranged on the air duct, the flow of the magnetized polyvinyl alcohol fibers and the serpentine asbestos powder can be conveniently measured, a cement stable base layer mixture is obtained, and the serpentine asbestos powder are designed, the warm stone powder has a fibrous space structure, can provide skeleton support for a waterproof reinforcing agent, is beneficial to forming a hardening protective layer on the surface layer of the base layer, and improves the waterproof protection effect on the base layer;
step S3: detecting the water content of the mixture, determining the optimal water content and the maximum dry density under different material composition conditions by adopting a vibration compaction method, and performing heavy compaction verification test on the determined mixture with the optimal water content to find out a conversion coefficient, wherein the conversion coefficient is generally 1.02-1.03;
step S4: and immediately transporting the qualified mixture to a construction site through a transport tool, and covering the mixture by using a shelter in the transportation process.
Specifically, the pre-stirring time in the step S1 is 30-110S, and the stirring time in the step S2 is 220-360S.
A construction method of a cement stabilized macadam foundation comprises the following construction processes:
process S1: the mixed materials are stirred by the stirring tank and then loaded, the transport vehicle moves back and forth in the loading process to reduce the segregation of the mixed materials, the roadbed is cleaned firstly before the paving, then the watering and the moistening are carried out, the hopper is slowly lifted when the transport vehicle carries out the unloading, the hopper is stopped when the hopper is lifted to a half, the mixed materials are basically paved and then lifted, and the segregation caused by the unloading is reduced;
process S2: two spreading machines are used for synchronous spreading, the spreading speed is 0.8m/min, the phenomena of segregation and virtual spreading need to be eradicated for re-spreading, and personnel are arranged on site to control the on-site spreading thickness and loose spreading coefficient;
process S3: finishing a rolling forming process before the early-stage solidification time is reached, rolling for 2 times by a hammer double-steel-wheel road roller, removing static and returning shock, then performing strong shock for 4 times by two single-steel-wheel road rollers, performing light collection by the hammer double-steel-wheel road roller after 3 times of weak shock, and finally rolling for 3 times by a rubber-wheel road roller, wherein the condition of high temperature and quick water loss occurs in a construction site, and water should be timely supplemented to the mixture on one side by adopting water spraying equipment;
process S4: and (3) curing the molded test piece for 7 days under the specified conditions, carrying out a 7-day soaking unconfined compressive strength test, and calculating the average value and the deviation coefficient of the test results.
The working principle is as follows: when the device is used, cement-stabilized macadam base layer components are stirred and mixed, an electronic dynamic meter is installed in a bin of a stirrer, cleaned and impurity-removed aggregate is firstly put into the bin, the aggregate is guided into a stirring tank of the stirrer by the bin after being metered, the operation method is repeated, a high-molecular mixture, cement and water are sequentially guided into the stirring tank, the high-molecular mixture, the cement and the water are guided into the stirring tank for stirring for one end, magnetized polyvinyl alcohol fibers and serpentine asbestos powder are sequentially and uniformly added into the stirring tank by an air duct for stirring and mixing, the meter is installed on the air duct, the flow of the magnetized polyvinyl alcohol fibers and the serpentine asbestos powder can be conveniently measured, the cement-stabilized macadam base layer mixture is obtained, the water content of the mixture is detected, the optimal water content and the maximum dry density under the condition of different material compositions are determined by a vibration compaction method, and the determined optimal water content of the mixture is subjected to water content measurement The conversion coefficient is generally 1.02-1.03, the qualified mixture is immediately transported to a construction site through a transport tool, a shelter is used for covering the mixture in the transportation process, the mixture is loaded after being stirred by a stirring tank, a transport vehicle moves back and forth in the loading process to reduce the segregation of the mixture, a roadbed is cleaned firstly before paving, then water is sprayed and moistened, a hopper is slowly lifted when the transport vehicle discharges the material, the transport vehicle stops when the hopper rises to a half, the mixture basically spreads and then rises to reduce the segregation generated by discharging, two pavers are used for synchronous operation, the pavers continuously pave at the paving speed of 0.8m/min, the phenomenon of segregation and virtual pavement is relieved for the repeated paving, and site personnel are arranged to control the paving thickness and the paving coefficient on the site, accomplish the rolling forming process before the coagulation time reachs in earlier stage, roll 2 times through hanma double steel wheel road roller, go quiet shake back, two single steel wheel road rollers are 4 times of strong vibrations altogether afterwards, 3 backs of weak vibrations, hanma double steel wheel road roller receipts light, rubber tyer road roller rolls 3 times at last, the higher condition of losing water of temperature appears in the job site, should take watering equipment in time to supply moisture to the mixture in one side, keep in good health 7 days with the good test piece of shaping according to the condition of regulation, and 7 days soak water and do not have the confined compressive strength test, calculate the average value and the deviation coefficient of test result.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention, the technical solutions and the inventive concepts of the present invention with equivalent or modified alternatives and modifications within the technical scope of the present invention.
Claims (7)
1. The cement-stabilized macadam foundation is characterized by comprising the following components: aggregate, cement, water, a high polymer mixture, magnetized polyvinyl alcohol fiber and serpentine asbestos powder;
the paint is prepared by mixing the following components in percentage by mass: 4.5 percent of cement, 4.5 percent of water, 0.3 to 0.97 percent of polymer mixture, 0.6 to 3 percent of magnetized polyvinyl alcohol fiber, 1.5 percent of serpentine asbestos powder and the balance of aggregate.
2. The cement stabilized macadam foundation of claim 1, wherein said polymer mixture comprises a polymer and a polymer binder, and the particle size of said polymer mixture is 410 μm to 830 μm, i.e. 20 mesh to 40 mesh.
3. The cement-stabilized macadam foundation according to claim 1, wherein the cement is selected from PC32.5 in an amount of 3.0-6.0% (i.e. the ratio of the mass of the cement to the mass of the whole cement-stabilized anti-crack foundation material), and the aggregate is selected from basalt macadam, and the diameter of the aggregate is 9.5-13.2 mm.
4. The cement-stabilized macadam foundation of claim 1, wherein said serpentine asbestos powder has a length of 100-200 μm.
5. The cement stabilized macadam foundation of claim 1, comprising the following manufacturing process:
step S1: stirring and mixing cement stabilized macadam base layer components, installing an electronic dynamic meter on a bin of a stirrer, putting cleaned and impurity-removed aggregate into the bin, metering, guiding the aggregate into a stirring tank of the stirrer by using the bin, repeating the operation method, and sequentially guiding a high-molecular mixture, cement and water into the stirring tank;
step S2: after the high molecular mixture, cement and water are led into a stirring tank for stirring for a period of time, a wind cylinder is utilized to sequentially and uniformly add the magnetized polyvinyl alcohol fiber and the serpentine asbestos powder into the stirring tank for stirring and mixing, and a meter is arranged on the wind cylinder, so that the flow of the magnetized polyvinyl alcohol fiber and the serpentine asbestos powder can be conveniently measured, and the cement-stabilized macadam base layer mixture is obtained;
step S3: detecting the water content of the mixture, determining the optimal water content and the maximum dry density under different material composition conditions by adopting a vibration compaction method, and performing a heavy compaction verification test on the determined mixture with the optimal water content to find out a conversion coefficient, wherein the conversion coefficient is generally 1.02-1.03;
step S4: and immediately transporting the qualified mixture to a construction site through a transport tool, and covering the mixture by using a shelter in the transportation process.
6. The cement-stabilized macadam foundation according to claim 5, wherein the pre-stirring time in step S1 is 30-110S, and the stirring time in step S2 is 220-360S.
7. The method for constructing the cement stabilized macadam foundation according to claim 1, comprising the following construction process:
process S1: the mixed materials are stirred by the stirring tank and then loaded, the transport vehicle moves back and forth in the loading process to reduce the segregation of the mixed materials, the roadbed is cleaned firstly before the paving, then the watering and the moistening are carried out, the hopper is slowly lifted when the transport vehicle carries out the unloading, the hopper is stopped when the hopper is lifted to a half, the mixed materials are basically paved and then lifted, and the segregation caused by the unloading is reduced;
process S2: two spreading machines are used for synchronous spreading, the spreading speed is 0.8m/min, the phenomena of segregation and virtual spreading need to be eradicated for re-spreading, and personnel are arranged on site to control the spreading thickness and the loose spreading coefficient on site;
process S3: finishing a rolling forming process before the early-stage solidification time is reached, rolling for 2 times by a hammer double-steel-wheel road roller, removing static and returning shock, then performing strong shock for 4 times by two single-steel-wheel road rollers, performing light collection by the hammer double-steel-wheel road roller after 3 times of weak shock, and finally rolling for 3 times by a rubber-wheel road roller, wherein the condition of high temperature and quick water loss occurs in a construction site, and water should be supplemented to the mixture on one side by adopting water spraying equipment;
process S4: and (3) curing the molded test piece for 7 days under the specified conditions, carrying out a 7-day soaking unconfined compressive strength test, and calculating the average value and the deviation coefficient of the test results.
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| CN202010641201.5A CN111792893A (en) | 2020-07-06 | 2020-07-06 | Cement stabilized macadam base and construction method thereof |
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| CN202010641201.5A CN111792893A (en) | 2020-07-06 | 2020-07-06 | Cement stabilized macadam base and construction method thereof |
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| CN110055846A (en) * | 2019-05-17 | 2019-07-26 | 河北瑞志交通技术咨询有限公司 | A kind of cement stabilized macadam base and its construction method |
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