CN111196702A - Polypropylene fiber modified cement stabilized macadam and preparation method thereof - Google Patents
Polypropylene fiber modified cement stabilized macadam and preparation method thereof Download PDFInfo
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- CN111196702A CN111196702A CN202010025382.9A CN202010025382A CN111196702A CN 111196702 A CN111196702 A CN 111196702A CN 202010025382 A CN202010025382 A CN 202010025382A CN 111196702 A CN111196702 A CN 111196702A
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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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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/107—Acids or salts thereof
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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
- C04B28/08—Slag cements
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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
- 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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
Abstract
The invention relates to a polypropylene fiber modified cement-stabilized macadam which comprises the following components in parts by weight: 95-105 parts of aggregate; 4.0-4.5 parts of Portland cement; 0.01-0.18 part of modified polypropylene fiber; 3.5-4.0 parts of water. The invention also provides a preparation method of the polypropylene fiber modified cement stabilized macadam. According to the invention, by adding the modified polypropylene fiber modified cement stabilized macadam, the durability problem of the existing semi-rigid base layer is solved, the shrinkage cracking resistance, the tensile strain resistance and the deformation resistance of the semi-rigid base layer are improved, and the cracking of the cement stabilized macadam material due to the temperature and drying shrinkage resistance can be well prevented.
Description
Technical Field
The invention relates to the technical field of road materials, in particular to a polypropylene fiber modified cement-stabilized macadam.
Background
The rapid development of economy drives rapid progress of various industries, and the living standard of people is increasingly improved, so in order to guarantee the convenience of people for going out and improve the quality of people for going out, the construction speed of China on the highway is continuously accelerated, and the construction of the highway brings great economic benefits to China while providing convenience for people for going out. By the end of 2017, the total mileage of the expressway in China has reached 13.65 kilometers [1], but the economic development drives the increase of traffic volume, so that the conditions of heavy load and overload of vehicles are prominent, and higher requirements are provided for the bearing capacity of the expressway. The semi-rigid base pavement is generally applied to expressways in China due to the characteristics of high strength, good stability, low manufacturing cost and the like, but the durability of the semi-rigid base pavement becomes the most obvious problem as more and more expressways with the semi-rigid base are tested under actual traffic load in recent years. The design age of a highway in the 'asphalt pavement design specification' of China [2] is 15 years, the pavement is structurally damaged after being used for 15 years, and the structural damage is required to be renovated or rebuilt to meet the specification requirements, but actually, the highway asphalt pavement of China starts to be structurally damaged only 6-7 years after being actually used on average, and the highway asphalt pavement of China has the effects of multiple factors such as traffic volume, overrun overload and the like, so that huge loss is caused to the economy of people, and meanwhile, the highway asphalt pavement structural design, materials and construction technology of China also provide higher challenges.
The semi-rigid base pavement is suitable for the historical development conditions of Chinese highway construction due to the characteristics of high strength, good stability, low manufacturing cost and the like, and fully exerts the advantages of the semi-rigid base pavement. The cement stabilized macadam is a material mainly adopted by a semi-rigid pavement base in China, and has the characteristics that the semi-rigid pavement base is easy to generate shrinkage cracks due to the fact that temperature and drying shrinkage are blocked, and is easy to generate fatigue cracks under the effect of long-term coupling load, so that reflection crack diseases are caused, structural damage is caused to a certain extent after accumulation, and the cement stabilized macadam becomes a main bottleneck limiting the service life of a high-grade highway.
A great deal of research is carried out at home and abroad on the modification technology of the semi-rigid base layer of the cement stabilized macadam, such as controlling the design strength of the cement stabilized macadam, improving the aggregate gradation of the cement stabilized macadam, researching the mix proportion design of cement and aggregate, using a water reducing agent, replacing part of the cement dosage with fly ash, arranging a pre-cutting seam, improving the construction and maintenance quality of the cement stabilized macadam and the like, and the semi-rigid base layer has a certain positive effect on improving the performance of the semi-rigid base layer, but the formation and the expansion of the micro cracks of the material cannot be fundamentally changed, and the deformation resistance and the strain resistance are poor, so that the semi-rigid base layer is easy to cause structural damage and serious.
Disclosure of Invention
Aiming at the problems, the invention provides a polypropylene fiber modified cement-stabilized macadam, aiming at solving the problem of durability of the existing semi-rigid base layer, and the shrinkage cracking resistance and fatigue cracking resistance of the macadam are improved by adding the modified polypropylene fiber modified cement-stabilized macadam.
The technical scheme adopted by the invention for solving the technical problems is as follows: the polypropylene fiber modified cement-stabilized macadam comprises the following components in parts by weight:
preferably, the components are as follows in parts by weight:
preferably, the modified polypropylene fiber consists of the following components in percentage by mass: light calcium carbonate: polypropylene fiber: xylene: modifying agent: initiator: water-0.8-1.2: 0.8-1.2: 1.8-2.3: 0.4-0.6: 0.01-0.02:15-25.
Preferably, the modified polypropylene fiber consists of the following components in percentage by mass: light calcium carbonate: polypropylene fiber: xylene: modifying agent: initiator: water-1: 1:2:0.5:0.01: 20.
Preferably, the precipitated volume of the light calcium carbonate is 2.4 to 2.8ml/g, and the density of the polypropylene fiber is 0.9 to 0.92g/cm3。
Preferably, the modifier is sodium acrylate, and the initiator is benzoyl peroxide.
Preferably, the content of organic matters in the aggregate is less than or equal to 2 percent, and the content of sulfate is less than or equal to 0.25 percent. (ii) a The aggregate is crushed stone with the maximum grain diameter not more than 31.5mm, and the grain composition grading range is as follows:
when the mesh size is 31.5mm, the passing percentage is 100 percent;
when the mesh size is 26.5mm, the passing percentage is 96.9-99.0%;
when the mesh size is 19.0mm, the passing percentage is 68.2-72.3%;
when the mesh size is 9.50mm, the passing percentage is 51.4-43.6%;
when the mesh size is 4.75mm, the passing percentage is 28.7-31.1%;
when the mesh size is 2.36mm, the passing percentage is 22.5-26.8%;
when the mesh size is 0.60mm, the passing percentage is 11.7-16.9%;
the passing percentage is 2.3-2.8% when the mesh size is 0.075 mm.
The invention also provides a preparation method of the polypropylene fiber modified cement-stabilized macadam, which comprises the following steps:
(1) preparing modified polypropylene fibers;
(2) weighing aggregate, dry-mixing in a mixer for 3-7s, adding modified polypropylene fiber, mixing for 5-10s, adding cement and water, and mixing for 70-90 s;
(3) and (3) paving the cement stabilized macadam prepared in the step (2) on a roadbed within three hours, and finishing paving work before initial setting of cement.
Preferably, the modified polypropylene fiber in the step (1) is prepared by the following steps:
A. weighing 0.8-1.2 parts of light calcium carbonate, 0.8-1.2 parts of polypropylene fiber, 1.8-2.3 parts of dimethylbenzene, 0.4-0.6 part of modifier, 0.01-0.02 part of initiator and 15-25 parts of water for later use,
B. cleaning and deoiling polypropylene fiber in boiling water bath for 4h, soaking the polypropylene fiber in mixed solution of dimethylbenzene and distilled water, heating and stirring in water bath, and swelling;
C. adding light calcium carbonate, reacting for a certain time, cooling, performing suction filtration, adding a modifier and an initiator, stirring, reacting for 1h, and washing with distilled water and acetone for several times;
D. and drying at 50-60 ℃ to obtain the modified polypropylene fiber.
Preferably, in step c, the modifier is sodium acrylate, and the initiator is benzoyl peroxide.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, a certain amount of modified polypropylene fiber is doped into the cement-stabilized macadam material, so that the tensile strain capacity of the cement-stabilized macadam material can be greatly enhanced, the strain hardening of the cement-stabilized macadam material is promoted, meanwhile, the fiber has good mechanical transferability, when the cement-stabilized macadam material cracks under the action of load, the tensile strength of the cement-stabilized macadam material can be increased along with the increase of the strain of the crack, the ultimate tensile strain of the cement-stabilized macadam material is improved, and a bridge network formed by the fiber can well prevent the cement-stabilized macadam material from cracking due to the resistance to temperature and drying shrinkage, so that the deformation resistance of the cement-stabilized macadam material can be integrally improved, the cracking is prevented, and the service life of a road;
2. the surface of the polypropylene fiber (namely PP fiber) modified by the light calcium carbonate coating method is coated by the fine particles of calcium carbonate, so that the roughness of the surface is increased; the density of the modified polypropylene fiber is increased to 1.06-1.16 g/cm 3. Compared with calcium carbonate, the larger the specific surface area of the light calcium carbonate is, the stronger the affinity with the fiber is, the density of the modified polypropylene fiber is close to the density of water, the dispersion in water is facilitated, and the technical problems that the light calcium carbonate can only be settled at the bottom and the affinity is weak due to the adoption of unmodified polypropylene fiber in the prior art are solved.
3. The surface of the polypropylene fiber (namely PP fiber) modified by the light calcium carbonate coating method is coated by the fine particles of calcium carbonate, so that the roughness of the surface is increased; the density of the modified polypropylene fiber is increased to 1.06-1.16 g/cm 3; not only the density of the PP fiber is improved, but also the hydrophilicity of the PP fiber is obviously enhanced due to hydroxyl generated by the hydrolysis of the surface of calcium carbonate and carboxyl introduced by modification. The density increase and the hydrophilicity enhancement are beneficial to the PP fiber to be uniformly dispersed in the cement stabilized macadam matrix in the construction process; the increase of the surface roughness is beneficial to enhancing the physical anchoring force between the fibers and the cement material, and the bonding force between the fibers and the cement hydration product is stronger, so that the cement stabilized macadam material can share larger stress when cracking, effectively slow down cracking, and remarkably improve the mechanical strength and the fatigue resistance.
Drawings
FIG. 1 is a dispersion of unmodified pp fibers in an aqueous solution;
FIG. 2 shows the dispersion of the coated and modified PP fibers in an aqueous solution.
Detailed Description
The present invention will now be described in detail with reference to the drawings, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
The invention is explained below in three examples and a control:
in the invention, the cement is ordinary portland cement, slag portland cement or pozzolanic portland cement, and the strength grade of the cement is 42.5 grade; this example adopted Hunan Tan cement plant of Hunan province to produce 42.5#Ordinary portland cement. The test results are shown in Table 1.
TABLE 1 Cement test results
The adopted macadam has three grades of 19-31.5 mm, 9.5-19 mm and 4.75-9.5 mm. The properties are shown in Table 2.
TABLE 2 macadam Properties
The macadam is prepared from a cement stabilized macadam mixture by adopting two grades. The grading types are shown in Table 3.
TABLE 3 design grading composition table
In the invention, the PP fiber is coated by the modified light calcium carbonate, the surface of the PP fiber which is not treated by the coating method is smooth (as shown in figure 1), and the surface of the PP fiber which is treated by the light calcium carbonate coating method is coated by fine calcium carbonate particles, so that the surface roughness is increased (as shown in figure 2). The density of the modified fiber is increased to 1.06-1.16 g/cm3. Not only the density of the PP fiber is improved, but also the hydrophilicity of the PP fiber is well improved due to hydroxyl generated by the hydrolysis of the surface of calcium carbonate and the introduction of carboxyl by modification. The contact wetting condition of the modified PP fiber and water is obviously higher compared with the contact wetting condition of the unmodified PP fiber and water.
Under the premise of the same basic raw materials, a control group experiment is carried out,
control group: the control group is not added with modified polypropylene fiber, only added with aggregate, portland cement and water, and comprises the following components in percentage by mass: aggregate: 100 parts of (A); cement: 4.5 parts; drinking water: 4 parts.
The preparation process of the material comprises the following steps: weighing broken stone aggregate, dry-mixing for 5s in a mixer, simultaneously adding cement and water, and mixing for 70-90s to obtain the cement stabilized broken stone base material.
The first embodiment is as follows:
the polypropylene fiber modified cement-stabilized macadam comprises the following components in parts by weight:
the modified polypropylene fiber comprises the following components in percentage by mass: light calcium carbonate: polypropylene fiber: xylene: modifying agent: initiator: water-0.8: 0.8:1.8:0.4:0.01: 15. The sedimentation volume of the light calcium carbonate is 2.4-2.8ml/g, and the density of the polypropylene fiber is 0.9-0.92g/cm3(ii) a The modifier is sodium acrylate, and the initiator is benzoyl peroxide; the content of organic matters in the aggregate is less than or equal to 2 percent, and the content of sulfate is less than or equal to 0.25 percent; the aggregate is crushed stone with the maximum grain diameter not more than 31.5mm, and the grain composition grading range is as follows:
when the mesh size is 31.5mm, the passing percentage is 100 percent;
when the mesh size is 26.5mm, the passing percentage is 96.9-99.0%;
when the mesh size is 19.0mm, the passing percentage is 68.2-72.3%;
when the mesh size is 9.50mm, the passing percentage is 51.4-43.6%;
when the mesh size is 4.75mm, the passing percentage is 28.7-31.1%;
when the mesh size is 2.36mm, the passing percentage is 22.5-26.8%;
when the mesh size is 0.60mm, the passing percentage is 11.7-16.9%;
the passing percentage is 2.3-2.8% when the mesh size is 0.075 mm.
The preparation method of the polypropylene fiber modified cement-stabilized macadam comprises the following steps:
(1) preparing modified polypropylene fiber: firstly, weighing 0.8 part of light calcium carbonate, 0.8 part of polypropylene fiber, 1.8 parts of dimethylbenzene, 0.4 part of modifier, 0.01 part of initiator and 15 parts of water for later use; then, washing and degreasing the PP fiber in boiling water bath for 4 hours, immersing the PP fiber in mixed solution of dimethylbenzene and distilled water, heating and stirring in water bath, and swelling; adding modified light calcium carbonate, reacting for a certain time, cooling, performing suction filtration, adding a modifier and an initiator, stirring, reacting for 1h, washing with distilled water and acetone for several times respectively, and drying at 50-60 ℃ to obtain modified polypropylene fibers (namely modified PP fibers);
(2) weighing aggregate, dry-mixing in a mixer for 3-7s, adding modified polypropylene fiber, mixing for 5-10s, adding cement and water, and mixing for 70-90 s;
(3) and (3) paving the cement stabilized macadam prepared in the step (2) on a roadbed within three hours, and finishing paving work before initial setting of cement.
Example two:
the polypropylene fiber modified cement-stabilized macadam comprises the following components in parts by weight:
the modified polypropylene fiber comprises the following components in percentage by mass: light calcium carbonate: polypropylene fiber: xylene: modifying agent: initiator: water-1: 1:2:0.5:0.01: 20. The sedimentation volume of the light calcium carbonate is 2.4-2.8ml/g, and the density of the polypropylene fiber is 0.9-0.92g/cm3(ii) a The modifier is sodium acrylate, and the initiator is benzoyl peroxide; the content of organic matters in the aggregate is less than or equal to 2 percent, and the content of sulfate is less than or equal to 0.25 percent. (ii) a The aggregate is crushed stone with the maximum grain diameter not more than 31.5mm, and the grain composition grading range is as follows:
when the mesh size is 31.5mm, the passing percentage is 100 percent;
when the mesh size is 26.5mm, the passing percentage is 96.9-99.0%;
when the mesh size is 19.0mm, the passing percentage is 68.2-72.3%;
when the mesh size is 9.50mm, the passing percentage is 51.4-43.6%;
when the mesh size is 4.75mm, the passing percentage is 28.7-31.1%;
when the mesh size is 2.36mm, the passing percentage is 22.5-26.8%;
when the mesh size is 0.60mm, the passing percentage is 11.7-16.9%;
the passing percentage is 2.3-2.8% when the mesh size is 0.075 mm.
The preparation method of the polypropylene fiber modified cement-stabilized macadam comprises the following steps:
(1) preparing modified polypropylene fiber: firstly, weighing 1 part of light calcium carbonate, 1 part of polypropylene fiber, 2 parts of dimethylbenzene, 0.5 part of modifier, 0.01 part of initiator and 20 parts of water for later use; then, washing and degreasing the PP fiber in boiling water bath for 4 hours, immersing the PP fiber in mixed solution of dimethylbenzene and distilled water, heating and stirring in water bath, and swelling; adding modified light calcium carbonate, reacting for a certain time, cooling, performing suction filtration, adding a modifier and an initiator, stirring, reacting for 1h, washing with distilled water and acetone for several times respectively, and drying at 50-60 ℃ to obtain modified polypropylene fibers (namely modified PP fibers);
(2) weighing aggregate, dry-mixing in a mixer for 3-7s, adding modified polypropylene fiber, mixing for 5-10s, adding cement and water, and mixing for 70-90 s;
(3) and (3) paving the cement stabilized macadam prepared in the step (2) on a roadbed within three hours, and finishing paving work before initial setting of cement.
Example three:
the polypropylene fiber modified cement-stabilized macadam comprises the following components in parts by weight:
the modified polypropylene fiber comprises the following components in percentage by mass: light calcium carbonate: polypropylene fiber: xylene: modifying agent: initiator: water-1.2: 1.2:2.3:0.6:0.02: 25. The sedimentation volume of the light calcium carbonate is 2.4-2.8ml/g, and the density of the polypropylene fiber is 0.9-0.92g/cm3(ii) a The modifier is sodium acrylate, and the initiator is benzoyl peroxide; the content of organic matters in the aggregate is less than or equal to 2 percent, and the content of sulfate is less than or equal to 0.25 percent. (ii) a The aggregate is crushed stone with the maximum particle size not more than 31.5mm and the particle composition of the crushed stoneThe grading range is as follows:
when the mesh size is 31.5mm, the passing percentage is 100 percent;
when the mesh size is 26.5mm, the passing percentage is 96.9-99.0%;
when the mesh size is 19.0mm, the passing percentage is 68.2-72.3%;
when the mesh size is 9.50mm, the passing percentage is 51.4-43.6%;
when the mesh size is 4.75mm, the passing percentage is 28.7-31.1%;
when the mesh size is 2.36mm, the passing percentage is 22.5-26.8%;
when the mesh size is 0.60mm, the passing percentage is 11.7-16.9%;
the passing percentage is 2.3-2.8% when the mesh size is 0.075 mm.
The preparation method of the polypropylene fiber modified cement-stabilized macadam comprises the following steps:
(1) preparing modified polypropylene fiber: firstly, weighing 1.2 parts of light calcium carbonate, 1.2 parts of polypropylene fiber, 2.3 parts of dimethylbenzene, 0.6 part of modifier, 0.02 part of initiator and 25 parts of water for later use; then, washing and degreasing the PP fiber in boiling water bath for 4 hours, immersing the PP fiber in mixed solution of dimethylbenzene and distilled water, heating and stirring in water bath, and swelling; adding modified light calcium carbonate, reacting for a certain time, cooling, performing suction filtration, adding a modifier and an initiator, stirring, reacting for 1h, washing with distilled water and acetone for several times respectively, and drying at 50-60 ℃ to obtain modified polypropylene fibers (namely modified PP fibers);
(2) weighing aggregate, dry-mixing in a mixer for 3-7s, adding modified polypropylene fiber, mixing for 5-10s, adding cement and water, and mixing for 70-90 s;
(3) and (3) paving the cement stabilized macadam prepared in the step (2) on a roadbed within three hours, and finishing paving work before initial setting of cement.
For the four embodiments, compaction tests are carried out according to a compaction method (T0804-1994) of inorganic binder stabilized soil in Highway engineering inorganic binder stabilized material test regulation (JTGE-51-2009) to determine the maximum dry density and the optimal water content, each cubic meter of cement stabilized macadam is weighed and prepared according to a mixing ratio, during the mixing process, fibers and aggregates are firstly mixed for 25-30 seconds to be uniform, then water and cement are added and mixed uniformly to form a mixture, and after a test piece is molded and maintained, the test piece is detected to obtain the following test data: (in the table, the control group shows data of cement-stabilized macadam to which no modified polypropylene fiber was added)
From the above test results, it can be seen that: the polypropylene fiber modified cement stabilized macadam material added with the modified polypropylene fiber has obviously improved crack resistance on the basis of improving mechanical properties, and is prepared according to the proportion of the invention, so that better crack resistance is further achieved, the tensile strain capacity of the cement stabilized macadam material can be greatly enhanced, the strain hardening of the cement stabilized macadam material is promoted, meanwhile, the fiber has good mechanical transferability, when cracks appear on the cement stabilized macadam material due to the load action, the tensile strength can be increased along with the increase of the crack strain, the ultimate tensile strain of the cement stabilized macadam material is improved, and a bridge network formed by the fiber can well prevent the cement stabilized macadam material from cracking due to the blocking of temperature and drying shrinkage, so that the deformation resistance of the cement stabilized macadam material can be integrally improved, prevent cracking and prolong the service life of the road.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (10)
1. The polypropylene fiber modified cement-stabilized macadam is characterized in that: comprises the following components in parts by weight:
2. the polypropylene fiber modified cement stabilized macadam of claim 1, wherein: the weight portions of the components are as follows:
3. the polypropylene fiber modified cement stabilized macadam of claim 2, wherein: the modified polypropylene fiber comprises the following components in percentage by mass: light calcium carbonate: polypropylene fiber: xylene: modifying agent: initiator: water-0.8-1.2: 0.8-1.2: 1.8-2.3: 0.4-0.6: 0.01-0.02:15-25.
4. The polypropylene fiber modified cement stabilized macadam of claim 3, wherein: the modified polypropylene fiber comprises the following components in percentage by mass: light calcium carbonate: polypropylene fiber: xylene: modifying agent: initiator: water-1: 1:2:0.5:0.01: 20.
5. The polypropylene fiber modified cement stabilized macadam of claim 3, wherein: the sedimentation volume of the light calcium carbonate is 2.4-2.8ml/g, and the density of the polypropylene fiber is 0.9-0.92g/cm3。
6. The polypropylene fiber modified cement stabilized macadam of claim 3, wherein: the modifier is sodium acrylate, and the initiator is benzoyl peroxide.
7. The polypropylene fiber modified cement stabilized macadam of claim 1, wherein: the content of organic matters in the aggregate is less than or equal to 2 percent, and the content of sulfate is less than or equal to 0.25 percent. (ii) a The aggregate is crushed stone with the maximum grain diameter not more than 31.5mm, and the grain composition grading range is as follows:
when the mesh size is 31.5mm, the passing percentage is 100 percent;
when the mesh size is 26.5mm, the passing percentage is 96.9-99.0%;
when the mesh size is 19.0mm, the passing percentage is 68.2-72.3%;
when the mesh size is 9.50mm, the passing percentage is 51.4-43.6%;
when the mesh size is 4.75mm, the passing percentage is 28.7-31.1%;
when the mesh size is 2.36mm, the passing percentage is 22.5-26.8%;
when the mesh size is 0.60mm, the passing percentage is 11.7-16.9%;
the passing percentage is 2.3-2.8% when the mesh size is 0.075 mm.
8. A process for the preparation of the polypropylene fiber modified cement stabilized macadam as claimed in any one of claims 1 to 7, comprising the steps of:
(1) preparing modified polypropylene fibers;
(2) weighing aggregate, dry-mixing in a mixer for 3-7s, adding modified polypropylene fiber, mixing for 5-10s, adding cement and water, and mixing for 70-90 s;
(3) and (3) paving the cement stabilized macadam prepared in the step (2) on a roadbed within three hours, and finishing paving work before initial setting of cement.
9. The method for preparing the polypropylene fiber modified cement-stabilized macadam according to claim 8, wherein: the preparation steps of the modified polypropylene fiber in the step (1) are as follows:
A. weighing 0.8-1.2 parts of light calcium carbonate, 0.8-1.2 parts of polypropylene fiber, 1.8-2.3 parts of dimethylbenzene, 0.4-0.6 part of modifier, 0.01-0.02 part of initiator and 15-25 parts of water for later use,
B. cleaning and deoiling polypropylene fiber in boiling water bath for 4h, soaking the polypropylene fiber in mixed solution of dimethylbenzene and distilled water, heating and stirring in water bath, and swelling;
C. adding light calcium carbonate, reacting for a certain time, cooling, performing suction filtration, adding a modifier and an initiator, stirring, reacting for 1h, and washing with distilled water and acetone for several times;
D. and drying at 50-60 ℃ to obtain the modified polypropylene fiber.
10. The method for preparing the polypropylene fiber modified cement-stabilized macadam according to claim 9, wherein: in the step c, the modifier is sodium acrylate, and the initiator is benzoyl peroxide.
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| CN202010025382.9A Pending CN111196702A (en) | 2020-01-10 | 2020-01-10 | Polypropylene fiber modified cement stabilized macadam and preparation method thereof |
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| CN111875340A (en) * | 2020-08-11 | 2020-11-03 | 黄勇 | Desert aeolian sand modified concrete technology |
| CN112694302A (en) * | 2021-02-06 | 2021-04-23 | 河北宏京新型建材有限公司 | Glass fiber concrete and preparation process thereof |
| CN114409333A (en) * | 2022-01-12 | 2022-04-29 | 东南大学 | Steel fiber lightweight aggregate cement stabilized macadam and preparation process thereof |
| CN114560655A (en) * | 2022-03-11 | 2022-05-31 | 西安市政道桥建设集团有限公司 | Pavement base material and preparation method thereof |
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| CN107445560A (en) * | 2017-09-11 | 2017-12-08 | 苏州东振路桥工程有限公司 | A kind of cement stabilized macadam |
| CN107827413A (en) * | 2017-11-01 | 2018-03-23 | 安徽铭能保温科技有限公司 | A kind of preparation method of the cement base composite ecotype insulation material of slag doping |
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| CN106278015A (en) * | 2016-07-26 | 2017-01-04 | 蚌埠市方阵商品混凝土有限公司 | A kind of concrete with excellent impact resistance energy |
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| CN111875340A (en) * | 2020-08-11 | 2020-11-03 | 黄勇 | Desert aeolian sand modified concrete technology |
| CN112694302A (en) * | 2021-02-06 | 2021-04-23 | 河北宏京新型建材有限公司 | Glass fiber concrete and preparation process thereof |
| CN114409333A (en) * | 2022-01-12 | 2022-04-29 | 东南大学 | Steel fiber lightweight aggregate cement stabilized macadam and preparation process thereof |
| CN114560655A (en) * | 2022-03-11 | 2022-05-31 | 西安市政道桥建设集团有限公司 | Pavement base material and preparation method thereof |
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