CN107935626B - Construction method of rapid-hardening early-strength road - Google Patents
Construction method of rapid-hardening early-strength road Download PDFInfo
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- CN107935626B CN107935626B CN201711203807.5A CN201711203807A CN107935626B CN 107935626 B CN107935626 B CN 107935626B CN 201711203807 A CN201711203807 A CN 201711203807A CN 107935626 B CN107935626 B CN 107935626B
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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
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
- E01C7/142—Mixtures or their components, e.g. aggregate
-
- 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
- C04B2111/40—Porous or lightweight materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
Abstract
The invention discloses a construction method of a rapid-hardening early-strength road. The construction method comprises the following steps: 1) preparing a construction site; 2) preparing quick-hardening early-strength cement; 3) preparing cement slurry; 4) preparing foam; 5) preparing foam concrete; 6) pouring foam concrete; 7) and (5) maintaining the foam concrete. According to the invention, the rapid-hardening early-strength type foam concrete meeting the construction requirements is prepared by preparing the rapid-hardening early-strength type cement firstly, and the casting efficiency of the foam concrete in the highway high fill can be improved, the labor is saved, the whole engineering time is shortened, and the engineering progress is accelerated by a cast-in-place construction method of the foam concrete.
Description
Technical Field
The invention relates to a construction method of a rapid-hardening early-strength road.
Background
In western regions of China, the landform is mainly mountainous, and the construction of highways in mountainous regions is limited by the conditions of terrain, landform and hydrogeology, so that high-fill extension construction is inevitably required to be carried out on the original roadbed; meanwhile, in order to meet the integral planning requirements of the state and better utilize excavated earthwork resources, a high fill roadbed form is increasingly adopted when the expressway is reconstructed and expanded. In high-grade highways in mountainous areas, fill and excavation foundations account for 80%, with high fill embankments exceeding 20m being rare. With the promotion of national policies, traffic construction is rapidly developed, the structural form of the high embankment in highway reconstruction and expansion in the future is further improved in quantity or height, and the high embankment also becomes the main form of a roadbed structure.
In a high fill roadbed area, the vertical pressure of a soil body is higher, the requirement on the bearing capacity of a foundation trench at the bottom of the soil body is higher, and the construction period is often tighter, so that sufficient natural settling time cannot be given to the newly-repaired road, and the phenomenon of uneven settling easily occurs in the use process of the newly-repaired road. The weight of the light foam concrete is lighter than that of the concrete with the same volume, and accounts for 30-50%, so that the corresponding pressure and later-stage settlement can be greatly reduced, and the light foam concrete is adopted for high-fill application of highways, so that later-stage maintenance cost can be greatly saved, and traffic safety can be guaranteed.
With the needs of engineering construction and the development of construction technology, some projects put higher requirements on the early strength of foam concrete, and the demand on quick-hardening early-strength concrete begins to increase gradually, including: 1. prestressed concrete which requires early compression; 2. precast concrete members that need to be produced quickly; 3. casting and molding in situ; 4. the running period of the template is accelerated; 5. construction in winter; 6. rush-repair of the road; 7. quick paving, and other uses. In order to solve the technical problems, a high-efficiency cement construction method needs to be developed to meet the engineering requirements of high road fill.
Disclosure of Invention
The invention aims to provide a construction method of a rapid-hardening early-strength road.
The technical scheme adopted by the invention is as follows:
a construction method of a rapid-hardening early-strength road comprises the following steps:
1) preparation of a construction site: leveling and cleaning a construction site, and separating the site into a plurality of construction areas by using templates;
2) preparing quick-hardening early-strength cement: mixing cement, mineral powder, fly ash, quicklime, phosphogypsum, bauxite, sodium bromide and a water reducing agent in a stirrer to obtain quick-hardening early-strength cement;
3) preparing cement slurry: mixing quick-hardening early-strength cement with water in a stirrer to obtain cement slurry;
4) preparing foam: in a foaming machine, mixing a concrete foaming agent and water to prepare a foaming agent solution, and accelerating the foaming agent solution to foam to obtain foam;
5) preparing foam concrete: mixing the cement slurry with foam to obtain foam concrete;
6) pouring foam concrete: pumping the foam concrete to a construction area by using a pipeline, and pouring by self-flowing of the foam concrete;
7) curing the foam concrete: and after the foam concrete is finally set, performing watering maintenance.
In step 1), the height of the template<1m, area of each construction area<400m2。
In the step 2), the mass ratio of cement, mineral powder, fly ash, quicklime, phosphogypsum, bauxite, sodium bromide to a water reducing agent is (38-42): (18-22): (14-16): (8-10): (8-9): (3-5): (2-4): (0.3-0.6).
In the step 2), the cement is ordinary portland cement, the mineral powder is blast furnace slag powder, the fly ash is class II F fly ash, and the water reducing agent is a melamine water reducing agent.
In the step 3), the water content of the cement slurry is 35-45 wt%.
In the step 4), the mass ratio of the concrete foaming agent to water is 1: (18-20); the step of hastening foaming is to hasten foaming by an air compressor, and the working pressure of the air compressor is 0.7-0.9 MPa; the foaming ratio is 18 to 22 times of the volume of the foaming agent solution.
In the step 5), the foam accounts for 60-70% of the total volume of the foam concrete.
In step 5), the wet density of the foam concrete is controlled at 500kg/m3～600kg/m3。
And 6), aligning the outlet of the pipeline with the pouring surface of the foam concrete.
In the step 7), the curing time is not less than 10 days.
The invention has the beneficial effects that:
according to the invention, the rapid-hardening early-strength type foam concrete meeting the construction requirements is prepared by preparing the rapid-hardening early-strength type cement firstly, and the casting efficiency of the foam concrete in the highway high fill can be improved, the labor is saved, the whole engineering time is shortened, and the engineering progress is accelerated by a cast-in-place construction method of the foam concrete.
The method comprises the following specific steps:
1. the invention prepares a quick-hardening early-strength type cement firstly, then prepares a quick-hardening early-strength type foam concrete meeting the construction requirements, and can carry out the next step of working procedures in the early stage of pouring, such as early form removal, early approach of machinery and the like, thereby greatly shortening the whole engineering time and accelerating the engineering progress.
2. By the construction method of the invention, the wet density of the foam concrete is 500kg/m3～600kg/m3Meanwhile, the strength of the self-leveling concrete can meet the engineering requirement, manual scraping is not needed like the existing construction method, a large amount of labor is saved, the pouring efficiency is improved, and the construction period is shortened.
Detailed Description
A construction method of a rapid-hardening early-strength road comprises the following steps:
1) preparation of a construction site: leveling and cleaning a construction site, and separating the site into a plurality of construction areas by using templates;
2) preparing quick-hardening early-strength cement: mixing cement, mineral powder, fly ash, quicklime, phosphogypsum, bauxite, sodium bromide and a water reducing agent in a stirrer to obtain quick-hardening early-strength cement;
3) preparing cement slurry: mixing quick-hardening early-strength cement with water in a stirrer to obtain cement slurry;
4) preparing foam: in a foaming machine, mixing a concrete foaming agent and water to prepare a foaming agent solution, and accelerating the foaming agent solution to foam to obtain foam;
5) preparing foam concrete: mixing the cement slurry with foam to obtain foam concrete;
6) pouring foam concrete: pumping the foam concrete to a construction area by using a pipeline, and pouring by self-flowing of the foam concrete;
7) curing the foam concrete: and after the foam concrete is finally set, performing watering maintenance.
Preferably, in step 1), the height of the template<1m, area of each construction area<400m2。
Preferably, in the step 2), the mass ratio of cement, mineral powder, fly ash, quicklime, phosphogypsum, bauxite, sodium bromide to the water reducing agent is (38-42): (18-22): (14-16): (8-10): (8-9): (3-5): (2-4): (0.3 to 0.6); further preferably, in the step 2), the mass ratio of the cement, the mineral powder, the fly ash, the quick lime, the phosphogypsum, the bauxite, the sodium bromide and the water reducing agent is 40:20:15:9:8.5:4:3: 0.5.
In the step 2), the cement is ordinary portland cement, the mineral powder is blast furnace slag powder, the fly ash is class II F fly ash, and the water reducing agent is a melamine water reducing agent.
Preferably, in the step 3), the water content of the cement slurry is 35-45 wt%; further preferably, in step 3), the water content of the cement slurry is 40 wt%.
Preferably, in the step 3), the stirring speed of the stirrer is 20-40 r/min, and the stirring time for mixing is 10-15 min.
Preferably, in the step 4), the mass ratio of the concrete foaming agent to the water is 1: (18-20); further preferably, in the step 4), the mass ratio of the concrete foaming agent to the water is 1: 19.
preferably, in the step 4), the foam generation is promoted by an air compressor, and the working pressure of the air compressor is 0.7-0.9 MPa; further preferably, in the step 4), the working pressure of the air compressor is 0.8 MPa.
Preferably, in the step 4), the foaming multiplying power is 18-22 times of the volume of the foaming agent solution; more preferably, in the step 4), the foaming ratio is 20 times the volume of the foaming agent solution.
Further, in the step 4), the concrete foaming agent is a conventional foaming agent used for preparing foamed lightweight soil, such as a rosin acid soap foaming agent, a metal aluminum powder foaming agent, a vegetable protein foaming agent, an animal protein foaming agent, a resin soap foaming agent, a hydrolyzed blood gel foaming agent, a petroleum aluminum sulfonate foaming agent and the like.
Preferably, in the step 5), the foam accounts for 60-70% of the total volume of the foam concrete.
Preferably, in step 5), the wet density of the foam concrete is controlled to be 500kg/m3～600kg/m3。
Preferably, in step 6), the outlet of the pipeline is flush with the pouring surface of the foam concrete.
Preferably, in the step 7), the curing time is not less than 10 days; more preferably, in the step 7), the curing time is 10 to 14 days.
The present invention will be described in further detail with reference to specific examples.
Example (b):
1. construction site preparation
The field preparation comprises: leveling a field, cleaning garbage and floating dust in the field, cleaning floating soil in the field so as to avoid influencing the binding force of the foam concrete and the base layer after pouring, and keeping the field to be treated clean, flat, firm and dry; when the weather is dry, the field is subjected to sprinkling pretreatment, the field is wetted and sprinkled at least twice to increase the bonding force between the pouring layer and the base layer, but no obvious accumulated water is left on the surface of the base layer, so that the foam in the foam concrete is prevented from being broken due to excessive water absorption of the base layer; the construction site is divided into areas smaller than 400m by using templates2In the area, the formwork support is used for fixing the formwork, so that the formwork is prevented from collapsing due to the lateral pressure of the foam concrete in the construction process; the height of the template is adjusted according to the construction requirement every time, and the construction height every time is not more than 1 m.
2. Preparation of quick-hardening early-strength cement
1) According to the mass parts, 40 parts of Huarun brand ordinary P.O 42.5 type cement purchased from the market, 20 parts of blast furnace slag powder and 15 parts of II-grade F-class fly ash are added into a stirrer and stirred for 5 minutes at 30 r/min;
2) and adding 9 parts of quicklime, 8.5 parts of phosphogypsum, 4 parts of bauxite, 3 parts of sodium bromide and 0.5 part of melamine water reducer into the uniformly stirred mixture, starting a stirrer, and continuously stirring for 10 minutes at 30r/min to obtain the quick-hardening early-strength cement.
3. Preparation of cement slurries
Mixing and stirring the quick-hardening early-strength cement and water at 30r/min for 10min to obtain cement slurry with the water content of 40 wt%;
mixing commercially available 42.5-grade ordinary portland cement (comparative example 1) and 42.5-grade early-strength portland cement (comparative example 2) with water to obtain comparative example cement slurry with the water content of 40 wt%, and performing strength comparison test analysis on the comparative example cement slurry and the comparative example cement slurry, wherein the strength test method is performed on the cement slurries by the aid of GB/T50081-2016 standard for mechanical property test of ordinary concrete for 3 days, 7 days and 28 days respectively; the results demonstrate that the concrete test pieces of comparative example 1 have strengths of 19.5MPa, 32.9MPa and 42.3MPa at 3 days, 7 days and 28 days, respectively, and comparative example 2 has strengths of 23.8MPa, 35.2MPa and 39.7MPa at 3 days, respectively, while those of the present example have strengths of 30.5MPa, 36.8MPa and 45.2MPa, respectively, which indicates that the test pieces of the present invention have better strength at 3 days than the early strength type cement and higher strength at 28 days than the early strength type cement and the ordinary type cement; therefore, the cementing material prepared by the quick-hardening early-strength formula not only improves the early compressive strength, but also does not reduce the later compressive strength.
4. Preparation of the foam
A foaming agent feeding pipe of a foaming machine is connected into a concrete foaming agent, a water inlet pipe of the foaming machine is connected, the dilution ratio is set to be 20, namely the mass ratio of the foaming agent to water is 1: 19, preparing a foaming agent solution. Then an air compressor is connected, the pressure of the air compressor is set to be 0.8MPa, foaming is started, and the final foaming multiplying power is 20 times, namely according to the volume of a foaming agent solution: foam 1: 20, the diameter of the foam is 0.5-3 mm.
5. Preparation of foam concrete
Mixing the cement material prepared in the step 3The slurry is conveyed into a cement slurry feed inlet of a foaming machine at a constant speed through a pumping pipeline, the prepared foam is conveyed into a stirring bin of the foaming machine for stirring, after the two are uniformly mixed, the mixed foam concrete is taken to measure the wet density, and the wet density is controlled to be 500kg/m3-600kg/m3In this case, the amount of foam is 60-70% of the total volume of the foamed concrete. Through detection, the fluidity of the prepared foam concrete is 340-350, and the self-flowing conveying can be realized.
6. Foam concrete casting
And (3) pumping the mixed foam concrete to the working area prepared in the step (1) through a pipeline, wherein the opening of the pipeline is flush with the liquid level of the foam concrete, so that the contact between the foam concrete and air is reduced as much as possible, and defoaming is prevented. After the pouring height of a preset working area reaches the design height, the opening of the pipeline can be improved to integrally sweep the foam concrete, then the material supply is stopped, the pipeline is transferred to the next working area, and the poured working area is not required to be manually scraped.
7. Cast-in-place foam concrete maintenance
And the foam concrete starts to be watered and maintained after being finally set, so that the surface of the foam concrete is prevented from being dehydrated, dried, contracted and cracked. Spraying water at least 3 times daily in summer; in winter, the curing temperature should be controlled at 0-35 ℃. The curing period should not be less than 10 days, and can be extended to 14 days. After maintenance, the strength can reach more than 1MPa, and the construction requirement on site is met.
The invention prepares a quick-hardening early-strength type cement firstly, then prepares a quick-hardening early-strength type foam concrete meeting the construction requirements, and can carry out the next step of working procedures in the early stage of pouring, such as early form removal, early approach of machinery and the like, thereby greatly shortening the whole engineering time and accelerating the engineering progress.
By the construction method of the invention, the wet density is 500kg/m3～600kg/m3The foam concrete can realize self-leveling, simultaneously the strength of the foam concrete can meet the requirements of engineering, the foam concrete does not need to be scraped manually like the prior construction method, a large amount of labor is saved, the pouring efficiency is improved, and the foam concrete is shrunkThe construction period is short.
Claims (3)
1. A construction method of a rapid hardening early strength road is characterized in that: the method comprises the following steps:
1) preparation of a construction site: leveling and cleaning a construction site, and separating the site into a plurality of construction areas by using templates;
2) preparing quick-hardening early-strength cement: mixing cement, mineral powder, fly ash, quicklime, phosphogypsum, bauxite, sodium bromide and a water reducing agent in a stirrer to obtain quick-hardening early-strength cement;
3) preparing cement slurry: mixing quick-hardening early-strength cement with water in a stirrer to obtain cement slurry;
4) preparing foam: in a foaming machine, mixing a concrete foaming agent and water to prepare a foaming agent solution, and accelerating the foaming agent solution to foam to obtain foam;
5) preparing foam concrete: mixing the cement slurry with foam to obtain foam concrete;
6) pouring foam concrete: pumping the foam concrete to a construction area by using a pipeline, and pouring by self-flowing of the foam concrete;
7) curing the foam concrete: after the foam concrete is finally set, carrying out watering maintenance;
in the step 1), the height of the template<1m, area of each construction area<400m2；
In the step 2), the mass ratio of cement, mineral powder, fly ash, quicklime, phosphogypsum, bauxite, sodium bromide to a water reducing agent is (38-42): (18-22): (14-16): (8-10): (8-9): (3-5): (2-4): (0.3 to 0.6); the cement is ordinary portland cement, the mineral powder is blast furnace slag powder, the fly ash is class II F fly ash, and the water reducing agent is a melamine water reducing agent;
in the step 3), the water content of the cement slurry is 35-45 wt%;
in the step 5), the foam accounts for 60-70% of the total volume of the foam concrete; the wet density of the foam concrete is controlled to be 500kg/m3～600kg/m3；
In the step 6), the outlet of the pipeline is flush with the pouring surface of the foam concrete.
2. The construction method of the rapid hardening early strength road according to claim 1, characterized in that: in the step 4), the mass ratio of the concrete foaming agent to water is 1: (18-20); the step of hastening foaming is to hasten foaming by an air compressor, and the working pressure of the air compressor is 0.7-0.9 MPa; the foaming ratio is 18 to 22 times of the volume of the foaming agent solution.
3. The construction method of the rapid hardening early strength road according to claim 1, characterized in that: in the step 7), the curing time is not less than 10 days.
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| CN201711203807.5A CN107935626B (en) | 2017-11-27 | 2017-11-27 | Construction method of rapid-hardening early-strength road |
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| CN201711203807.5A CN107935626B (en) | 2017-11-27 | 2017-11-27 | Construction method of rapid-hardening early-strength road |
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| CN107935626B true CN107935626B (en) | 2020-12-29 |
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| CN113683377B (en) * | 2021-08-30 | 2022-08-12 | 广东盛瑞科技股份有限公司 | Foamed light soil with high phosphogypsum content and preparation method thereof |
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| CN1887772A (en) * | 2005-06-27 | 2007-01-03 | 牛宁民 | Sulfoaluminate cement foaming agent and foamed sulfoaluminate cement concrete |
| CN103508712B (en) * | 2012-06-28 | 2015-06-24 | 沈阳红姗石建筑装饰材料有限公司 | High-performance cast-in-place foam concrete and preparation method thereof |
| CN104086215B (en) * | 2014-04-11 | 2016-02-24 | 中国水利水电第十一工程局有限公司 | A kind of foamed concrete material and construction technology |
| RU2610008C1 (en) * | 2015-12-07 | 2017-02-07 | Юлия Алексеевна Щепочкина | Raw materials for manufacturing foam concrete |
| CN107165013A (en) * | 2017-06-02 | 2017-09-15 | 东南大学 | Geotechnical grid reinforcement foam concrete light road foundation fills structure and its method |
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