CN117645451A - Fiber-toughened anti-cracking cement stabilized macadam and preparation method and construction method thereof - Google Patents
Fiber-toughened anti-cracking cement stabilized macadam and preparation method and construction method thereof Download PDFInfo
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- CN117645451A CN117645451A CN202311643069.1A CN202311643069A CN117645451A CN 117645451 A CN117645451 A CN 117645451A CN 202311643069 A CN202311643069 A CN 202311643069A CN 117645451 A CN117645451 A CN 117645451A
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- 239000004568 cement Substances 0.000 title claims abstract description 106
- 238000005336 cracking Methods 0.000 title claims abstract description 54
- 238000010276 construction Methods 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 100
- 239000004575 stone Substances 0.000 claims abstract description 94
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 35
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 35
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 35
- 239000002270 dispersing agent Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 9
- 239000010426 asphalt Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 30
- 239000000203 mixture Substances 0.000 claims description 26
- 239000004576 sand Substances 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 9
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 8
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 8
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 8
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005204 segregation Methods 0.000 claims description 3
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 claims description 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 2
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 2
- 229920000609 methyl cellulose Polymers 0.000 claims description 2
- 239000001923 methylcellulose Substances 0.000 claims description 2
- 235000010981 methylcellulose Nutrition 0.000 claims description 2
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 claims description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 2
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 239000006185 dispersion Substances 0.000 abstract description 5
- 239000002245 particle Substances 0.000 description 26
- 239000010410 layer Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 7
- 239000011398 Portland cement Substances 0.000 description 5
- 239000003651 drinking water Substances 0.000 description 5
- 235000020188 drinking water Nutrition 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013305 flexible fiber Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 125000003010 ionic group Chemical group 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011382 roller-compacted concrete Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000011885 synergistic combination Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
- C04B14/4643—Silicates other than zircon
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0641—Polyvinylalcohols; Polyvinylacetates
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Architecture (AREA)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a fiber toughened anti-cracking cement stabilized macadam which is prepared from the following raw materials in parts by weight: 3-6 parts of cement, 50-70 parts of graded broken stone, 5-15 parts of fine aggregate, 1-5 parts of basalt fiber, 1-5 parts of polyvinyl alcohol fiber with the length of 6-12mm, 1-5 parts of dispersing agent and 5-8 parts of water. Based on the same inventive concept, the invention also provides a preparation method of the fiber toughened anti-cracking cement stabilized macadam. In addition, the invention also provides a construction process of the fiber toughened anti-cracking cement stabilized macadam. In addition, the invention also provides application of the fiber toughened anti-cracking cement stabilized macadam in asphalt pavement construction as a base layer or a subbase layer. The fiber toughened anti-cracking cement stabilized macadam provided by the invention can enable the used fibers to be uniformly dispersed in the cement stabilized macadam, has a good dispersion effect, improves the mechanical property, and has excellent anti-cracking performance.
Description
Technical Field
The invention relates to the field of cement stabilized macadam, in particular to fiber toughening anti-cracking cement stabilized macadam, and a preparation method and a construction method thereof.
Background
The cement stabilized macadam is low-grade roller compacted concrete formed by mixing and rolling cobble, stone powder, stone dust, cement and water, is widely applied to the basic layer construction of high-grade roads, and is a semi-rigid and semi-flexible material for transition from a rigid road structure to a flexible asphalt structure. The cement stabilized macadam mixture is sensitive to the change of ambient temperature and humidity, and has high rigidity, reflection cracks can be generated in the strength forming process and during operation, and the main reason for generating the reflection cracks is that the semi-rigid base material is easy to generate shrinkage and thermal shrinkage stress when being subjected to external environment change, particularly temperature and humidity change, so that the base layer is cracked, the generated stress can be concentrated at the crack tip, the cracks develop towards the surface layer, finally penetrate through the whole pavement structure, the reflection cracks are formed, and the service performance of a road is seriously damaged.
In the prior art, different types of fibers are used for composite reinforcement, so that the shrinkage and temperature shrinkage strain can be reduced, and the cracking resistance of the semi-rigid base layer is improved, and the cracking is prevented and treated. Chinese patent CN200910190976.9 discloses a cement stabilized macadam pavement base material doped with micro steel fibers and other fibers of different lengths, including cement stabilized macadam, and also includes a multi-scale fiber material, where the multi-scale fiber material includes micro steel fibers and glass fibers, so as to improve impact resistance of the base material and increase fracture energy, but hard fibers such as micro steel fibers and glass fibers have poor deformation resistance due to higher hardness of the fibers themselves, and are easy to cause loss to equipment in stirring process, and most of such fibers have high cost, so that it is difficult to apply in engineering on a large scale. Although the effect of the flexible fibers represented by polypropylene and polyvinyl alcohol is remarkable, the problem of poor dispersibility is common in the use process due to the serious aggregation phenomenon of the fibers.
Cement stabilized macadam mixtures are commonly used for base layers or subbase layers in constructing asphalt pavement structures, and in road construction, not only pavement paving is important, but also construction technology of the road base layer is important.
Thus, improvements are needed in the art.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a fiber toughened anti-cracking cement stabilized macadam and a preparation method and a construction method thereof. The fiber toughened anti-cracking cement stabilized macadam provided by the invention can enable the used fibers to be uniformly dispersed in the cement stabilized macadam, has a good dispersion effect, improves the mechanical property, and has excellent anti-cracking performance.
The technical scheme provided by the invention is as follows:
the fiber toughened anti-cracking cement stabilized macadam comprises the following raw materials in parts by weight: 3-6 parts of cement, 50-70 parts of graded broken stone, 5-15 parts of fine aggregate, 1-5 parts of basalt fiber, 1-5 parts of polyvinyl alcohol fiber with the length of 6-12mm, 1-5 parts of dispersing agent and 5-8 parts of water.
In the invention, the length of the basalt fiber is 10-15 mm, preferably, the length of the basalt fiber is 10mm, the mechanical property of the basalt fiber is superior to that of glass fiber, the price of the basalt fiber is lower than that of carbon fiber, and the basalt fiber has the advantages of environmental protection and economy. The basalt inorganic fiber and the polyvinyl alcohol organic fiber can form a space reticular structure of the fiber net, so that displacement is limited, the strength between broken stone and aggregate is improved, meanwhile, the polyvinyl alcohol fiber has surface activity, the plasticizing and water retention performances of cement are improved, and the polyvinyl alcohol fiber reacts with positive charge ionic groups or coordination chemical bonds in the cement, so that the water content is reduced, the cement stabilized broken stone is gradually hydrated and hardened, and the integral strength and toughness are improved. The fiber can effectively prevent surface layer cracking after being mixed again, has obvious fiber reinforcement cracking prevention effect, delays or reduces cracks of the cement stabilized macadam, and improves the shrinkage performance of the cement stabilized macadam. In the invention, the length of basalt fiber and the length of polyvinyl alcohol fiber are not suitable to be too long, for example, the length of basalt fiber is longer than 15mm, and the length of polyvinyl alcohol fiber is longer than 12mm, because too long fiber can increase the uniform difficulty during mixing, has poor dispersibility, and can prevent migration of water and health maintenance; the length of basalt fiber and the length of polyvinyl alcohol fiber are not too short, for example, the length of basalt fiber is shorter than 10mm and the length of polyvinyl alcohol fiber is shorter than 6mm, because too short fiber results in a fiber having a small water absorption, and the effect of suppressing shrinkage is poor.
The fiber toughened anti-cracking cement stabilized macadam comprises the following components: the stone crusher comprises primary broken stone, secondary broken stone, tertiary broken stone, quaternary broken stone and five-stage broken stone, wherein the grain size of the primary broken stone is 0-5 mm, the grain size of the secondary broken stone is 5-10 mm, the grain size of the tertiary broken stone is 10-20 mm, the grain size of the four-stage broken stone is 20-30 mm, and the grain size of the five-stage broken stone is 30-50 mm.
The fiber toughened anti-cracking cement stabilized macadam comprises the following primary macadam, secondary macadam, tertiary macadam, quaternary macadam and five-stage macadam in the graded macadam in parts by weight: 15-20 parts of primary broken stone, 15-20 parts of secondary broken stone, 20-25 parts of tertiary broken stone, 15-20 parts of quaternary broken stone and 30-50 parts of five-stage broken stone. Preferably, the graded broken stone comprises the following primary broken stone, secondary broken stone, tertiary broken stone, quaternary broken stone and five-stage broken stone in parts by weight: 15 parts of primary broken stone, 15 parts of secondary broken stone, 25 parts of tertiary broken stone, 20 parts of quaternary broken stone and 35 parts of five broken stone. The graded broken stone is the skeleton aggregate, and after the health-care molding, the bonding strength and the self strength among broken stone particles can resist external force load together, so that the strength of the cement stabilized broken stone is improved.
The fiber toughening anti-cracking cement stabilized macadam is characterized in that the dispersing agent is any one of methylcellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, sodium carboxymethylcellulose, sodium polyacrylate and polyacrylamide. Preferably, the dispersing agent is hydroxypropyl methylcellulose.
The fiber toughened anti-cracking cement stabilized macadam is characterized in that the fine aggregate is any one of river sand, machine-made sand and stone dust. Preferably, the fine aggregate is river sand.
As a preferred embodiment of the invention, the fiber-toughened anti-cracking cement stabilized macadam comprises the following raw materials in parts by weight: 5 parts of cement, 60 parts of graded broken stone, 5 parts of fine aggregate, 5 parts of basalt fiber, 3 parts of polyvinyl alcohol fiber with the length of 6-12mm, 3 parts of dispersing agent and 6 parts of water.
Based on the same inventive concept, the invention provides a preparation method of fiber toughened anti-cracking cement stabilized macadam, which comprises the following steps:
step (1): uniformly mixing and stirring graded broken stone, fine aggregate and basalt fiber to obtain a primary mixture; in the mixing process in the step (1), basalt fibers are firstly added, the adding time is relatively early, the basalt fibers are not mixed with water at the same time, the phenomenon of agglomeration is avoided, and the dispersion uniformity of the basalt fibers in the mixture is facilitated;
step (2): and (3) mixing and stirring the cement, the polyvinyl alcohol fiber, the dispersing agent and the water uniformly, then adding the preliminary mixture in the step (1), and stirring and mixing uniformly again to obtain the fiber toughened anti-cracking cement stabilized macadam. In the mixing process in the step (2), the polyvinyl alcohol fibers are added in a later period, and the polyvinyl alcohol fibers are short in length, so that the phenomenon of agglomeration can not occur under the action of a dispersing agent, and the polyvinyl alcohol fibers are well dispersed in cement.
The preparation method of the fiber toughened anti-cracking cement stabilized macadam comprises the step (1) of stirring for 3-5 min.
The preparation method of the fiber toughened anti-cracking cement stabilized macadam comprises the step (2) of stirring for 10-15 min.
Based on the same inventive concept, the invention provides a construction method of fiber toughened anti-crack cement stabilized macadam, which comprises the following steps:
step S1: and (3) preparation of construction: detecting the strength of the lower bearing layer of the base layer, and ensuring that the bearing capacity of vehicles and mechanical equipment in construction can be born; constructing a construction temporary facility on a construction site, and installing and debugging construction equipment; cleaning the surface of the base layer to reach construction conditions;
step S2: mixing the cement stabilized macadam mixture: adopting a plant mixing method for construction, and uniformly mixing according to the raw material proportion of the cement stabilized macadam mixture; the plant-mixing method has the advantages of high construction operation efficiency, short construction period, environmental protection, low cost, small traffic interference and energy conservation;
step S3: paving and rolling: transporting the cement stabilized macadam mixture to a construction site by adopting a vehicle, wherein the paving speed is 2.5-3 m/min; when segregation occurs in the paving process, the pavement is cleaned manually in time; after rolling, the surface of the base layer is ensured to be flat, and no bulge phenomenon exists;
step S4: curing the compacted pavement: water is sprayed during the life preservation period for life preservation, and the life preservation period is not less than 7d; traffic is enclosed during the life-preserving period.
Based on the same inventive concept, the invention provides an application of fiber toughened anti-crack cement stabilized macadam in asphalt pavement construction as a base layer or a subbase layer.
The technical scheme provided by the invention has the beneficial effects that:
1. the fiber toughened anti-cracking cement stabilized macadam provided by the invention has excellent comprehensive performance through the mutual synergistic cooperation of a certain amount of basalt fiber and polyvinyl alcohol fiber and other various components in a formula, and has excellent compressive strength, drying shrinkage performance and thermal shrinkage performance.
2. The fiber toughened anti-cracking cement stabilized macadam provided by the invention can enable the used fibers to be uniformly dispersed in the cement stabilized macadam, has a good dispersion effect, improves the mechanical property, and has excellent anti-cracking performance.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical solutions of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items. It is to be understood that various raw materials in the present invention are commercially available unless otherwise specified.
Example 1:
the fiber toughened anti-cracking cement stabilized macadam comprises the following raw materials in parts by weight:
5 parts of cement, 60 parts of graded broken stone, 5 parts of fine aggregate, 5 parts of basalt fiber with the length of 10mm, 3 parts of polyvinyl alcohol fiber with the length of 6mm, 3 parts of dispersing agent and 6 parts of water.
In the embodiment, the cement adopts 42.5-grade ordinary Portland cement, the water consumption of the standard consistency is 27%, the initial setting time is 220min, the final setting time is 350min, the 3d flexural strength is 5MPa, the 28d flexural strength is 9MPa, the 3d compressive strength is 29MPa, and the 28d compressive strength is 51MPa; the particle size of the primary gravels is 0-5 mm, the particle size of the secondary gravels is 5-10 mm, the particle size of the tertiary gravels is 10-20 mm, the particle size of the quaternary gravels is 20-30 mm, the particle size of the fifth gravels is 30-50 mm, and the weight parts of the primary gravels, the secondary gravels, the tertiary gravels, the quaternary gravels and the fifth gravels in the graded gravels are as follows: 15 parts of primary broken stone, 15 parts of secondary broken stone, 25 parts of tertiary broken stone, 20 parts of quaternary broken stone and 35 parts of five-stage broken stone; the fine aggregate is river sand; the dispersing agent is hydroxypropyl methyl cellulose; the water is drinking water.
The preparation method of the fiber toughened anti-cracking cement stabilized macadam provided by the embodiment comprises the following steps: the method comprises the following steps:
step (1): uniformly mixing and stirring graded broken stone, fine aggregate and basalt fiber according to a proportion for 3-5 min to obtain a primary mixture;
step (2): mixing cement, polyvinyl alcohol fiber, dispersant and water according to the proportion, stirring uniformly, adding the preliminary mixture in the step (1), stirring uniformly again, and stirring for 10-15 min to obtain the fiber toughened anti-cracking cement stabilized macadam.
Example 2:
the fiber toughened anti-cracking cement stabilized macadam comprises the following raw materials in parts by weight:
5 parts of cement, 60 parts of graded broken stone, 5 parts of fine aggregate, 3 parts of basalt fiber with the length of 10mm, 5 parts of polyvinyl alcohol fiber with the length of 6mm, 3 parts of dispersing agent and 6 parts of water.
In the embodiment, the cement adopts 42.5-grade ordinary Portland cement, the water consumption of the standard consistency is 27%, the initial setting time is 220min, the final setting time is 350min, the 3d flexural strength is 5MPa, the 28d flexural strength is 9MPa, the 3d compressive strength is 29MPa, and the 28d compressive strength is 51MPa; the particle size of the primary gravels is 0-5 mm, the particle size of the secondary gravels is 5-10 mm, the particle size of the tertiary gravels is 10-20 mm, the particle size of the quaternary gravels is 20-30 mm, the particle size of the fifth gravels is 30-50 mm, and the weight parts of the primary gravels, the secondary gravels, the tertiary gravels, the quaternary gravels and the fifth gravels in the graded gravels are as follows: 15 parts of primary broken stone, 15 parts of secondary broken stone, 25 parts of tertiary broken stone, 20 parts of quaternary broken stone and 35 parts of five-stage broken stone; the fine aggregate is river sand; the dispersing agent is hydroxypropyl methyl cellulose; the water is drinking water.
The preparation method of the fiber toughened anti-cracking cement stabilized macadam provided by the embodiment comprises the following steps: the method comprises the following steps:
step (1): uniformly mixing and stirring graded broken stone, fine aggregate and basalt fiber according to a proportion for 3-5 min to obtain a primary mixture;
step (2): mixing cement, polyvinyl alcohol fiber, dispersant and water according to the proportion, stirring uniformly, adding the preliminary mixture in the step (1), stirring uniformly again, and stirring for 10-15 min to obtain the fiber toughened anti-cracking cement stabilized macadam.
Example 3:
the fiber toughened anti-cracking cement stabilized macadam comprises the following raw materials in parts by weight:
5 parts of cement, 60 parts of graded broken stone, 5 parts of fine aggregate, 1 part of basalt fiber with the length of 10mm, 5 parts of polyvinyl alcohol fiber with the length of 12mm, 3 parts of dispersing agent and 6 parts of water.
In the embodiment, the cement adopts 42.5-grade ordinary Portland cement, the water consumption of the standard consistency is 27%, the initial setting time is 220min, the final setting time is 350min, the 3d flexural strength is 5MPa, the 28d flexural strength is 9MPa, the 3d compressive strength is 29MPa, and the 28d compressive strength is 51MPa; the particle size of the primary gravels is 0-5 mm, the particle size of the secondary gravels is 5-10 mm, the particle size of the tertiary gravels is 10-20 mm, the particle size of the quaternary gravels is 20-30 mm, the particle size of the fifth gravels is 30-50 mm, and the weight parts of the primary gravels, the secondary gravels, the tertiary gravels, the quaternary gravels and the fifth gravels in the graded gravels are as follows: 15 parts of primary broken stone, 15 parts of secondary broken stone, 25 parts of tertiary broken stone, 20 parts of quaternary broken stone and 35 parts of five-stage broken stone; the fine aggregate is river sand; the dispersing agent is hydroxypropyl methyl cellulose; the water is drinking water.
The preparation method of the fiber toughened anti-cracking cement stabilized macadam provided by the embodiment comprises the following steps: the method comprises the following steps:
step (1): uniformly mixing and stirring graded broken stone, fine aggregate and basalt fiber according to a proportion for 3-5 min to obtain a primary mixture;
step (2): mixing cement, polyvinyl alcohol fiber, dispersant and water according to the proportion, stirring uniformly, adding the preliminary mixture in the step (1), stirring uniformly again, and stirring for 10-15 min to obtain the fiber toughened anti-cracking cement stabilized macadam.
Example 4:
the fiber toughened anti-cracking cement stabilized macadam comprises the following raw materials in parts by weight:
5 parts of cement, 60 parts of graded broken stone, 5 parts of fine aggregate, 4 parts of basalt fiber with the length of 10mm, 4 parts of polyvinyl alcohol fiber with the length of 6mm, 3 parts of dispersing agent and 6 parts of water.
In the embodiment, the cement adopts 42.5-grade ordinary Portland cement, the water consumption of the standard consistency is 27%, the initial setting time is 220min, the final setting time is 350min, the 3d flexural strength is 5MPa, the 28d flexural strength is 9MPa, the 3d compressive strength is 29MPa, and the 28d compressive strength is 51MPa; the particle size of the primary gravels is 0-5 mm, the particle size of the secondary gravels is 5-10 mm, the particle size of the tertiary gravels is 10-20 mm, the particle size of the quaternary gravels is 20-30 mm, the particle size of the fifth gravels is 30-50 mm, and the weight parts of the primary gravels, the secondary gravels, the tertiary gravels, the quaternary gravels and the fifth gravels in the graded gravels are as follows: 15 parts of primary broken stone, 15 parts of secondary broken stone, 25 parts of tertiary broken stone, 20 parts of quaternary broken stone and 35 parts of five-stage broken stone; the fine aggregate is river sand; the dispersing agent is hydroxypropyl methyl cellulose; the water is drinking water.
The preparation method of the fiber toughened anti-cracking cement stabilized macadam provided by the embodiment comprises the following steps: the method comprises the following steps:
step (1): uniformly mixing and stirring graded broken stone, fine aggregate and basalt fiber according to a proportion for 3-5 min to obtain a primary mixture;
step (2): mixing cement, polyvinyl alcohol fiber, dispersant and water according to the proportion, stirring uniformly, adding the preliminary mixture in the step (1), stirring uniformly again, and stirring for 10-15 min to obtain the fiber toughened anti-cracking cement stabilized macadam.
Example 5:
the fiber toughened anti-cracking cement stabilized macadam comprises the following raw materials in parts by weight:
5 parts of cement, 60 parts of graded broken stone, 5 parts of fine aggregate, 5 parts of basalt fiber with the length of 10mm, 5 parts of polyvinyl alcohol fiber with the length of 10mm, 5 parts of dispersing agent and 6 parts of water.
In the embodiment, the cement adopts 42.5-grade ordinary Portland cement, the water consumption of the standard consistency is 27%, the initial setting time is 220min, the final setting time is 350min, the 3d flexural strength is 5MPa, the 28d flexural strength is 9MPa, the 3d compressive strength is 29MPa, and the 28d compressive strength is 51MPa; the particle size of the primary gravels is 0-5 mm, the particle size of the secondary gravels is 5-10 mm, the particle size of the tertiary gravels is 10-20 mm, the particle size of the quaternary gravels is 20-30 mm, the particle size of the fifth gravels is 30-50 mm, and the weight parts of the primary gravels, the secondary gravels, the tertiary gravels, the quaternary gravels and the fifth gravels in the graded gravels are as follows: 15 parts of primary broken stone, 15 parts of secondary broken stone, 25 parts of tertiary broken stone, 20 parts of quaternary broken stone and 35 parts of five-stage broken stone; the fine aggregate is river sand; the dispersing agent is hydroxypropyl methyl cellulose; the water is drinking water.
The preparation method of the fiber toughened anti-cracking cement stabilized macadam provided by the embodiment comprises the following steps: the method comprises the following steps:
step (1): uniformly mixing and stirring graded broken stone, fine aggregate and basalt fiber according to a proportion for 3-5 min to obtain a primary mixture;
step (2): mixing cement, polyvinyl alcohol fiber, dispersant and water according to the proportion, stirring uniformly, adding the preliminary mixture in the step (1), stirring uniformly again, and stirring for 10-15 min to obtain the fiber toughened anti-cracking cement stabilized macadam.
Example 6:
the invention provides a construction method of fiber toughened anti-cracking cement stabilized macadam, which comprises the following steps:
step S1: and (3) preparation of construction: detecting the strength of the lower bearing layer of the base layer, and ensuring that the bearing capacity of vehicles and mechanical equipment in construction can be born; constructing a construction temporary facility on a construction site, and installing and debugging construction equipment; cleaning the surface of the base layer to reach construction conditions;
step S2: mixing the cement stabilized macadam mixture: adopting a plant mixing method for construction, and uniformly mixing according to the raw material proportion of the cement stabilized macadam mixture;
step S3: paving and rolling: the cement stabilized macadam mixture is transported to a construction site by a vehicle, and the paving speed is 2.5-3 m/min; when segregation occurs in the paving process, the pavement is cleaned manually in time; after rolling, the surface of the base layer is ensured to be flat, and no bulge phenomenon exists;
step S4: curing the compacted pavement: water is sprayed during the life preservation period for life preservation, and the life preservation period is not less than 7d; traffic is enclosed during the life-preserving period.
Comparative example 1:
the difference from example 1 is that 5 parts of basalt fiber having a length of 10mm is not contained.
Comparative example 2:
the difference from example 1 is that 3 parts of polyvinyl alcohol fibers having a length of 6mm are replaced with 3 parts of polyvinyl alcohol fibers having a length of 22 mm.
Comparative example 3:
the difference from example 1 is that 3 parts of dispersant are not contained.
The 7d unconfined compressive strength and 28d unconfined compressive strength test methods for testing the cement stabilized macadam prepared in examples 1 to 5 and comparative examples 1 to 3 are described in "test procedure for inorganic binder stabilization materials for highway engineering" (JTGE 51-2009), the drying shrinkage factor and the thermal shrinkage factor test methods are described in "test methods for drying shrinkage cracking properties for Cement mortar and concrete" (GB/T29417-2012), and the results are shown in Table 1.
TABLE 1 test results of Cement stabilized macadam of examples 1-5, comparative examples 1-3
From the comparison of the above experimental results in table 1, it can be seen that: compared with comparative examples 1-3, the test performance of examples 1-5 is greatly improved, and examples 1-5 are obviously better than comparative examples 1-3, which shows that the components and the content of basalt fiber, polyvinyl alcohol fiber and dispersing agent are irreplaceable, and the excellent comprehensive performance can be realized only by the mutual synergistic combination of the basalt fiber, the polyvinyl alcohol fiber and other various components in the formula, thus the invention has excellent compressive strength, drying shrinkage performance and thermal shrinkage performance. As can be seen from the results of comparing basalt fiber with 10mm in length, polyvinyl alcohol fiber with 6mm in length and dispersing agent in examples 1-5, the fiber toughened anti-cracking cement stabilized macadam prepared in example 1 is optimal in terms of 7d unconfined compressive strength, 28d unconfined compressive strength, average dry shrinkage coefficient and average thermal shrinkage coefficient, which means that the proportion of cement, graded macadam, fine aggregate, basalt fiber, polyvinyl alcohol fiber, dispersing agent and water in example 1 is optimal.
The fiber toughened anti-cracking cement stabilized macadam provided by the invention can enable the used fibers to be uniformly dispersed in the cement stabilized macadam, has a good dispersion effect, improves the mechanical property, and has excellent anti-cracking performance.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. The fiber toughened anti-cracking cement stabilized macadam is characterized by comprising the following raw materials in parts by weight: 3-6 parts of cement, 50-70 parts of graded broken stone, 5-15 parts of fine aggregate, 1-5 parts of basalt fiber, 1-5 parts of polyvinyl alcohol fiber with the length of 6-12mm, 1-5 parts of dispersing agent and 5-8 parts of water.
2. The fiber toughened crack resistant cement stabilized macadam of claim 1, wherein said graded macadam comprises: the stone crusher comprises primary broken stone, secondary broken stone, tertiary broken stone, quaternary broken stone and five-stage broken stone, wherein the grain size of the primary broken stone is 0-5 mm, the grain size of the secondary broken stone is 5-10 mm, the grain size of the tertiary broken stone is 10-20 mm, the grain size of the four-stage broken stone is 20-30 mm, and the grain size of the five-stage broken stone is 30-50 mm.
3. The fiber toughened anti-cracking cement stabilized macadam of claim 2, wherein the graded macadam comprises the following components in parts by weight: 15-20 parts of primary broken stone, 15-20 parts of secondary broken stone, 20-25 parts of tertiary broken stone, 15-20 parts of quaternary broken stone and 30-50 parts of five-stage broken stone.
4. The fiber toughened anti-crack cement stabilized macadam as claimed in claim 1, wherein the dispersing agent is any one of methylcellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, sodium carboxymethylcellulose, sodium polyacrylate and polyacrylamide.
5. The fiber toughened anti-cracking cement stabilized macadam of claim 1, wherein the fine aggregate is any one of river sand, machine-made sand and stone chips.
6. The fiber toughened anti-cracking cement stabilized macadam as claimed in claim 1, is characterized by comprising the following raw materials in parts by weight: 5 parts of cement, 60 parts of graded broken stone, 5 parts of fine aggregate, 5 parts of basalt fiber, 3 parts of polyvinyl alcohol fiber with the length of 6-12mm, 3 parts of dispersing agent and 6 parts of water.
7. The method for preparing fiber-toughened crack-resistant cement stabilized macadam as claimed in any one of claims 1 to 6, comprising the steps of:
step (1): uniformly mixing and stirring graded broken stone, fine aggregate and basalt fiber to obtain a primary mixture;
step (2): and (3) mixing and stirring the cement, the polyvinyl alcohol fiber, the dispersing agent and the water uniformly, then adding the preliminary mixture in the step (1), and stirring and mixing uniformly again to obtain the fiber toughened anti-cracking cement stabilized macadam.
8. The method for preparing fiber reinforced crack resistant cement stabilized macadam as claimed in claim 7, wherein the stirring time in the step (1) is 3-5 min.
9. The construction method of fiber-reinforced crack-resistant cement stabilized macadam as claimed in any one of claims 1 to 6, comprising the steps of:
step S1: and (3) preparation of construction: detecting the strength of the lower bearing layer of the base layer, and ensuring that the bearing capacity of vehicles and mechanical equipment in construction can be born; constructing a construction temporary facility on a construction site, and installing and debugging construction equipment; cleaning the surface of the base layer to reach construction conditions;
step S2: mixing a fiber-toughened crack-resistant cement stabilized macadam mixture as claimed in any one of claims 1 to 6: adopting a plant mixing method for construction, and uniformly mixing according to the raw material proportion of the cement stabilized macadam mixture;
step S3: paving and rolling: the cement stabilized macadam mixture is transported to a construction site by a vehicle, and the paving speed is 2.5-3 m/min; when segregation occurs in the paving process, the pavement is cleaned manually in time; after rolling, the surface of the base layer is ensured to be flat, and no bulge phenomenon exists;
step S4: curing the compacted pavement: water is sprayed during the life preservation period for life preservation, and the life preservation period is not less than 7d; traffic is enclosed during the life-preserving period.
10. Use of a fiber-toughened crack-resistant cement stabilized macadam according to any one of claims 1 to 6 or a fiber-toughened crack-resistant cement stabilized macadam obtained by the method of preparation of claim 7 in asphalt pavement construction as a base or subbase.
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