CN115029975B - Filling type large-particle-size cement stabilized macadam base and forming process thereof - Google Patents
Filling type large-particle-size cement stabilized macadam base and forming process thereof Download PDFInfo
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- CN115029975B CN115029975B CN202210665678.6A CN202210665678A CN115029975B CN 115029975 B CN115029975 B CN 115029975B CN 202210665678 A CN202210665678 A CN 202210665678A CN 115029975 B CN115029975 B CN 115029975B
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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
- E01C3/00—Foundations for pavings
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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
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
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- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a filling type large-particle-size cement stabilized macadam base layer and a forming process thereof, wherein the filling type large-particle-size cement stabilized macadam base layer consists of the following raw materials in parts by mass: 10 parts of large-particle-size broken stone, 9.5 parts of filler, 0.5 part of caulking material, 1 part of cement and 1 part of water; the large-particle-size broken stone, the filling material and the caulking material are subjected to vibration compaction treatment to form a material collecting layer, and the material collecting layer is of a laminated structure formed by periodically paving the large-particle-size broken stone, the filling material and the caulking material. According to the invention, fine aggregate is divided into filler and caulking material, a proper raw material proportion and grading mode are selected, a periodic laminated structure is arranged at the same time, a material collecting layer is formed after vibration compaction treatment, and a filled large-particle-size cement stabilized macadam base layer is obtained after health maintenance; the molding process can remarkably improve the compressive strength and the cracking resistance of the highway base material, and can be applied as the highway base material.
Description
Technical Field
The invention relates to the field of road engineering, in particular to a filling type large-particle-size cement stabilized macadam base and a forming process thereof.
Background
At present, the pavement base layer in China mainly comprises a semi-rigid base layer and a flexible base layer which are represented by cement stabilized macadam base layers, and the semi-rigid base layer and the flexible base layer have the characteristics and the corresponding defects. The semi-rigid pavement base layer is usually a cement stabilized macadam base layer, and the base layer structure has the advantages of good water stability, high rigidity, low cost, high strength, good integrity and the like; however, the cement stabilized macadam base has the obvious defects of easy shrinkage crack generation, long-term retention of rainwater, development of pits, looseness, net-shaped cracks and the like. The flexible base layer is opposite, has relatively small rigidity, is not easy to generate shrinkage cracks, causes surface reflection cracks, is insensitive to water changes, and is not easy to damage by water. However, the flexible base layer has obvious defects such as small rigidity and large deflection, so that the pavement structure is deformed greatly, and is easy to move horizontally, loose, pock, netlike cracks, subsidence and other common diseases.
In recent years, in order to combine the advantages of the two base layers, a novel base layer material filled with water-stabilized macadam with large particle size is proposed, and the structure is a novel pavement base layer structure between the two base layers. At present, in the construction engineering of large modification of the semi-rigid base asphalt pavement, the filling effect of the water-stable large-grain-size broken stone base is obvious; in long-term performance verification and pavement test, the filled large-particle-size cement stabilized macadam has good rut resistance; meanwhile, under the same manufacturing cost condition, the road performance and the service performance are better.
However, currently large particle size filled water stabilized macadam substrates are rarely used on high grade highway substrates, only on low grade highway substrates. Meanwhile, the existing evaluation is on-site application evaluation, the qualitative evaluation is carried out through the damage condition of the road surface within a few years after the vehicle is passed, an indoor evaluation means and a test method are lacked, the application condition of the base layer cannot be evaluated through an indoor experiment, and further the design mode of the filling type large-particle-size cement stabilized macadam base layer with optimal performance cannot be obtained before the actual application. Therefore, a new solution to the above-mentioned problems is required.
Disclosure of Invention
The invention aims to provide a filling type large-particle-size cement stabilized macadam base layer and a forming process thereof, which are used for solving the problem that the filling type large-particle-size cement stabilized macadam base layer design mode with optimal performance cannot be obtained before actual application in the prior art.
In order to solve the technical problems, the first solution provided by the present invention is as follows: the filling type large-particle-size cement stabilized macadam base layer consists of the following raw materials in parts by mass: 9-12 parts of large-particle-size broken stone, 9-10 parts of filler, 0.3-0.8 part of caulking material, 0.7-1.2 parts of cement and 0.8-1.2 parts of water; the large-particle-size broken stone, the filling material and the caulking material are subjected to vibration compaction treatment to form a material collecting layer, and the material collecting layer is of a laminated structure formed by periodically paving the large-particle-size broken stone, the filling material and the caulking material.
Preferably, the filling type large-particle-size cement stabilized macadam base layer consists of the following raw materials in parts by weight: 10 parts of large-particle-size broken stone, 9.5 parts of filler, 0.5 part of caulking material, 1 part of cement and 1 part of water.
Preferably, the particle size of the large-particle-size crushed stone is 40-60 mm, the crushing value is 14.2%, the content of the needle-shaped particles is 17.2%, and the relative density is 2.61g/cm 3 。
Preferably, the organic matter content in the filling material and the caulking material is less than or equal to 0.6 percent, the sulfate content is less than or equal to 0.1 percent, and the relative density is 2.61g/cm 3 Methylene blue value<3。
Preferably, the particle size of the filling material is divided into 3 grades, including a first grade with the particle size of 0-5 mm, a second grade with the particle size of 5-10 mm and a third grade with the particle size of 10-15 mm; the mass ratio of the first gear to the second gear to the third gear of the filling material is 6:2.5:1.5.
Preferably, the size of the particle size of the caulking material is divided into 2 grades, including a first grade with the particle size of 0-5 mm and a second grade with the particle size of 5-10 mm; the mass ratio of the first gear to the second gear of the caulking material is 6:4.
In order to solve the technical problems, a second solution provided by the present invention is: a molding process of a filling type large-grain-size cement stabilized macadam base layer is used for preparing the filling type large-grain-size cement stabilized macadam base layer in the first solution and comprises the following steps: s1, weighing raw materials according to a proportion, sequentially paving large-particle-size broken stones, filling materials and caulking materials, and obtaining a material collecting layer after vibration compaction treatment; s2, paving water and cement on the aggregate layer in sequence, and curing to form the filled large-particle-size cement stabilized macadam base.
Wherein, the step S1 specifically comprises the following steps: sequentially paving large-particle-size broken stones and filling materials to form a laminated unit, and vibrating after paving one laminated unit each time; after three laminated units are paved periodically, caulking materials are filled in the edges, and the caulking materials are compacted until the surfaces are flat, so that a material collecting layer is obtained.
Preferably, in the step S1, a surface vibration compaction instrument is adopted for vibration compaction treatment; after each laying of one laminated unit, the laminated unit is vibrated for 150s, the vibration frequency is 60Hz, and the rotating speed is 1400 rpm.
Preferably, in step S2, the health conditions are: the relative humidity is 93-97%, and the temperature is 19-21 ℃ until the cement is finally set.
The beneficial effects of the invention are as follows: compared with the prior art, the invention provides a filling type large-particle-size cement stabilized macadam base and a forming process thereof, wherein fine aggregate is divided into filling materials and caulking materials, a proper raw material proportion and a proper grading mode are selected, a periodic laminated structure is arranged at the same time, a material collecting layer is formed after vibration compaction treatment, and the filling type large-particle-size cement stabilized macadam base is obtained after health maintenance; the molding process can remarkably improve the compressive strength and the cracking resistance of the highway base material, and can be applied as the highway base material.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a filled large particle size cement stabilized macadam foundation of the present invention;
FIG. 2 is a detailed schematic view of the aggregate layer of FIG. 1;
FIG. 3 is a graph of dielectric constant measurements of the new mix.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with 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 present invention without making any inventive effort, are intended to fall within the scope of the present invention.
For the first solution provided by the present invention, please refer to fig. 1 and 2, the filled large-particle-size cement stabilized macadam base is composed of the following raw materials in parts by weight: 10 parts of large-particle-size broken stone, 9.5 parts of filler, 0.5 part of caulking material, 1 part of cement and 1 part of water; the large-particle-size broken stone, the filling material and the caulking material are subjected to vibration compaction treatment to form a material collecting layer, wherein the material collecting layer is a laminated structure formed by periodically paving the large-particle-size broken stone, the filling material and the caulking material, and the material collecting layer comprises a plurality of laminated units. Further preferably, the filling type large-particle-size cement stabilized macadam base layer consists of the following raw materials in parts by weight: 10 parts of large-particle-size broken stone, 9.5 parts of filler, 0.5 part of caulking material, 1 part of cement and 1 part of water.
In this embodiment, the large-particle-diameter crushed stone has a particle diameter of 40 to 60mm, a crushing value of 14.2%, a needle-like particle content of 17.2%, and a relative density of 2.61g/cm 3 . The organic matter content in the filling material and the caulking material is less than or equal to 0.6 percent, the sulfate content is less than or equal to 0.1 percent, and the relative density is 2.61g/cm 3 Methylene blue value<3。
In the embodiment, the particle size of the filler is divided into 3 grades, including a first grade with the particle size of 0-5 mm, a second grade with the particle size of 5-10 mm and a third grade with the particle size of 10-15 mm; the mass ratio of the first gear to the second gear to the third gear of the filling material is 6:2.5:1.5. In addition, it is necessary to incorporate a certain amount of cement in the preparation of the filler, preferably 13% by mass of cement based on the mass of the filler particles.
In the embodiment, the size of the particle size of the caulking material is divided into 2 grades, including a first grade with the particle size of 0-5 mm and a second grade with the particle size of 5-10 mm; the mass ratio of the first gear to the second gear of the caulking material is 6:4. In addition, it is desirable to incorporate a quantity of cement, preferably 10% of the mass of the caulk particles, in the production of the caulk.
The second solution provided by the invention is a molding process of the filling type large-grain-size cement stabilized macadam base, which is used for preparing the filling type large-grain-size cement stabilized macadam base in the first solution and comprises the following steps:
s1, weighing raw materials according to a proportion, paving large-particle-size broken stones, filling materials and caulking materials in sequence, and obtaining a material collecting layer after vibration compaction treatment. In the step, the large-grain-size gravels, the filling materials and the caulking materials are preferably andesite, raw materials are weighed according to the proportion, the large-grain-size gravels and the filling materials are paved in sequence to form a lamination unit, and vibration treatment is carried out after one lamination unit is paved each time; after three laminated units are periodically laid, caulking materials are filled in the edges, and the caulking materials are compacted until the surfaces are flat, so that a material collecting layer is obtained, and the structure of the material collecting layer is shown in figure 2. The basic structure mainly takes an interlayer between gravels with large particle sizes as a main strength source; the filler and caulking material play a role in stabilizing. The embedded-extrusion structure is formed and has good friction and embedded-extrusion force, so that the whole filled large-particle-size water-stabilized macadam structure has good bearing capacity. The three laminated units can slow down the generation of horizontal and vertical thrust of the large-grain broken stone skeleton due to the embedding and extruding force, thereby effectively relieving the occurrence of diseases such as net cracks and the like and having good anti-cracking performance. In the embodiment, a surface vibration compaction device is adopted for vibration compaction treatment; after each laying of one laminated unit, the laminated unit is vibrated for 150s, the vibration frequency is 60Hz, and the rotating speed is 1400 rpm.
S2, paving water and cement on the aggregate layer in sequence, and curing to form the filled large-particle-size cement stabilized macadam base. In the step, water and cement are sequentially paved on the material collecting layer, and the structure of the material collecting layer is shown in figure 1; and (3) when curing, the relative humidity is 93-97%, the temperature is 19-21 ℃, and the filling type large-particle-size cement stabilized macadam base layer is formed until the cement is finally set.
In the embodiment, the determination process of the proportions of the components of the large-particle-size broken stone, the filling material, the caulking material, the cement and the water is as follows: after vibratory compaction, the above-mentioned raw material components form a mixture, and the void volume of the large-particle-size crushed stone, the surplus volume of the filler and the caulk, the maximum dry density of the filler and the caulk, and the optimum water content of the mixture are measured and calculated.
The total volume of filler and caulk in the unit volume of the mix was calculated as follows (1)：
(1) In the method, in the process of the invention,representing the void volume of the large-particle-size crushed stone per unit volume after vibratory compaction; />Representing the adjustment of the filling and caulking materialsInteger coefficient->Generally, 1.08-1.16 is taken.
a) Calculating the mass ratio of the filling material to the large-particle-size broken stone
The mass of the filler in the unit volume of the mixture was calculated as follows (2)：
(2) In the method, in the process of the invention,the volume coefficient of the filling material in the unit volume of the mixture is expressed, and generally 0.95 is taken; />Representing the total volume of filler and caulk in a unit volume of the mix; />Indicating the maximum dry density of the filler after vibratory compaction.
The mass ratio of the filler to the large-particle-size gravels is calculated according to the following steps (3) and (4)：
(3) In the formula (4), the components are as follows,representing the mass of large-particle-size crushed stone aggregates in a unit volume of the mixture; />Indicating the apparent density of the large-particle-size crushed stone; />Indicating the mass of filler per unit volume of the mix.
b) Calculating mass ratio of caulking material to large-particle-size broken stone
The mass of caulk in the unit volume of the mix was calculated as follows (5)：
(5) In the method, in the process of the invention,the volume coefficient of the caulking material in the unit volume of the mixture is expressed, and generally 0.05 is taken; />Representing the total volume of filler and caulk in a unit volume of the mix; />Indicating the maximum dry density of the caulk after vibratory compaction.
The mass ratio of caulking material to large-grain diameter broken stone is calculated according to the following (6)：
(6) In the method, in the process of the invention,representing the mass of caulk in a unit volume of the mix; />The mass of the large-particle-size broken stone aggregate in the unit volume of the mixture is represented.
c) Because the freshly mixed mixture is in a loose state, in order to ensure the measurement accuracy and reduce the discreteness of measurement data, a plum blossom spotting method is adopted for measurement, as shown in fig. 3, the measurement is carried out for a plurality of times, and the average value is taken as the dielectric constant value of the freshly mixed mixture. In this embodiment, the CRIM model is preferable to predict the water content of the base fresh mix, and the specific procedure is described in patent CN202111305926, and the predicted water content is predicted by this method. In addition, in order to accurately obtain the water content of the freshly mixed mixture, 9kg of the mixed mixture was divided into 3 groups based on the predicted water content, and the water content was measured by a drying method, and the average value was taken as the water content of each group of freshly mixed mixture.
d) The proportion of each component in the filling type large-grain-size cement stabilized macadam base layer is determined through the mass ratio of the filling material, the caulking material and the large-grain-size macadam and the optimal water content of the mixture; specifically, 454.5g of large-particle-size crushed stone, 431.8g of filler, 22.7g of caulking compound, 45.4g of cement and 45.6g of water are contained in each 1kg of the mixture.
Further, the mechanism and advantages of the filling type large-particle-size cement stabilized macadam base are described:
(1) The large-grain-size broken stone is used for forming a framework structure of the pavement base layer, the filling material is used for filling the internal gaps of the framework structure of the large-grain-size broken stone, and the caulking material is used for filling the open gaps on the surface of the large-grain-size broken stone; the filler and caulking material are used as fine aggregate, and the maximum particle size of the filler and caulking material should form larger broken gear with the particle size of the large-particle-size broken stone used as coarse aggregate, so that interference to the large-particle-size broken stone skeleton is reduced to the maximum extent, and the coarse aggregate and the fine aggregate can be well embedded. In the embodiment, the crushed stone with the large particle size is preferably 40-60 mm crushed stone, and the maximum particle size of the filling material and the caulking material is preferably 15mm. The large-particle-size broken stone is used as a main framework, broken stone is used as a filling material and caulking material to be filled between the frameworks, so that a jogged structure is formed, meanwhile, good friction resistance and joggling force are achieved, the whole filled large-particle-size cement stabilized broken stone structure has good bearing capacity, and excellent strength is achieved.
(2) Because of the existence of large-grain-size broken stone, the stress transmission between the filling material and the caulking material is blocked, the semi-rigid performance of the whole roadbed structure layer is weakened, the local semi-rigid performance in the roadbed structure layer is reserved because of the existence of the filling material and the caulking material, and the novel roadbed structure combining semi-rigidity and flexibility can effectively reduce reflection cracks of the semi-rigid base layer, so that the novel roadbed structure has excellent crack resistance.
(3) Since the filled large-grain-size cement stabilized macadam mainly provides strength through the embedding and squeezing action among the large-grain-size macadam serving as a main framework, the corresponding dependence on the strength of the filling material is less, and therefore, the base layer can be communicated during the life-preserving period, and the influence on traffic is less.
The test effect of the filled large-particle-size cement stabilized macadam foundation is analyzed by the following specific examples. In each of the following examples 1 and comparative example 1, a basic performance test of cement was carried out according to "details of construction technology for highway pavement base" (JTG-T F, 20-2015), and the test results are shown in Table 1.
Table 1 cement performance test
In the following example 1 and comparative example 1, andesite was used as a raw material for an aggregate layer (andesite was used as the large-particle-diameter crushed stone, filler and caulking material in example 1), and the andesite was an acidic stone, and had a reddish brown color, high hardness and severe needle-like shape.
Examples 1 to 4
1) Aggregate performance
According to the technical rules of highway cement concrete pavement construction (J JTG-T F-2014), in the embodiment, large-particle-size broken stone is used as coarse aggregate, filler and caulking material are used as fine aggregate, and the basic performances of the coarse aggregate and the fine aggregate are respectively tested, and the test results are shown in tables 2-3.
TABLE 2 coarse aggregate Performance parameters
TABLE 3 Fine aggregate Performance parameters
2) Component compounding ratio and grading
In the embodiment, the filling material and the caulking material are continuously graded, and the continuous grading is designed by adopting a maximum density curve; the grading design theory includes fullerene and Talbot grading theory, etc., and the Talbot grading theory is adopted for grading design, and the calculation formula is as follows。
The filler is specifically divided into three grades of aggregate with the particle size of 0-5 mm, 5-10 mm and 10-15 mm, and the synthetic grading table is shown in table 4. The cement dosage of the filling material is 10%, and the representative value of the unconfined compressive strength in 7 days is 7.6MPa.
TABLE 4 synthetic gradation table of fillers
According to the particle size, the caulking material is specifically divided into two grades of aggregate with the particle size of 0-5 mm and 5-10 mm, and the synthetic grading table is shown in table 5; the caulking aggregate cement dosage is 13%, and the 7d unconfined compressive strength representative value is 11.2MPa.
TABLE 5 caulk Synthesis grading Table
3) Compacting and shaping
The equipment adopted in the embodiment is a surface vibration compaction instrument, 454.5g of large-grain-size broken stone, 431.8g of filler, 22.7g of caulking material, 45.4g of cement and 45.6g of water are weighed, the large-grain-size broken stone and the filler are paved in sequence, a lamination unit is formed in the inner cavity of the surface vibration compaction instrument, and vibration treatment is carried out after one lamination unit is paved each time; after three lamination units are paved periodically, caulking materials are filled in the edges, and the caulking materials are compacted until the surfaces are flat, so that a material collecting layer is obtained; sample preparation is carried out according to different molding processes, the specific process parameters of examples 1-4 are shown in table 6, the vibration time represents the vibration treatment time after each laminated unit is paved, and the paving sequence of the large-particle-size crushed stone and the filling material represents whether each laminated unit is paved in sequence or randomly paved according to the sequence of the large-particle-size crushed stone and the filling material.
TABLE 6 statistics of molding process parameters
After the forming test piece is completed, the test piece and the mould are put into a concrete curing box together for curing. During health preserving, the health preserving conditions of the upper surface and the lower surface of the test piece are as follows: humidity 95+ -2%, temperature 20+ -1deg.C. And after the cement is finally set, taking out the test piece, then carrying out hoop unloading and demoulding, sleeving the test piece with a plastic bag, and continuing to carry out curing to obtain four groups of test piece samples, wherein the diameters of the four groups of test piece samples are 280mm.
For the different molding processes, an unconfined compressive strength and uniaxial compression modulus under unconfined conditions were tested, and the test results are shown in table 7. Based on the specification requirements, the unconfined compressive strength of the cement-stabilized base material 7d is 3.0-5.0 MPa, and the test piece strength of each of the embodiment 1 and the embodiment 4 can be seen from the table 1 to meet the requirements. After the test piece of the embodiment 2 is cured for 35 days, the uniaxial compression modulus can reach 969.8MPa, and the test piece is continuously cured for 42 days, the modulus of the test piece can reach 1494.6MPa, and the test piece has the optimal molding effect and is easy to demold and mold. In contrast, the test pieces prepared in examples 1, 3 and 4 were inferior to those prepared in example 2 in terms of vibration time, rotation speed, laying sequence and number of laminating unit cycles, i.e., it was confirmed that a good strength effect could be obtained only by adopting appropriate process conditions during the vibration compaction treatment.
Table 7 results of unconfined compressive strength and uniaxial compressive modulus testing for examples 1-4
Comparative example 1
In the comparative example, a surface vibration compaction apparatus was still used, and the ordinary cement stabilized macadam material was molded with the process parameters of the vibration frequency, the vibration time, the test piece size, and the like of the foregoing example 2, and four-stage aggregates were used, which were 0 to 5mm, 5 to 10mm, 10 to 15mm, and 15 to 29mm, respectively, and the synthetic gradation tables thereof are shown in table 8.
Table 8 synthetic grading table for ordinary cement stabilized macadam material
Adopting the mixing proportion of the common cement stabilized macadam, the cement dosage is 5%, adopting a surface vibration compaction instrument to carry out indoor molding, wherein the traditional molding method of the cement stabilized macadam base layer is to add once, the periodic lamination units are not arranged, and the distinguishing arrangement of filling materials and caulking materials is not carried out; the curing conditions are the same as those of the filled large-particle-size cement stabilized macadam material, and the sample of the comparative example 1 is prepared after the curing time is up.
Comparative example 2
The preparation process and the grading of the comparative example 1 are based on the difference that the sample of the comparative example 2 is prepared in the comparative example 2 by adopting the traditional static pressure method, and other process conditions are consistent with those of the comparative example 1.
For the samples of comparative examples 1 and 2, an unconfined compressive strength and uniaxial compressive modulus under unconfined conditions were tested and compared with the test results of example 2, and the comparison results are shown in table 9. As can be seen, the vibration compaction treatment is adopted in the comparative example 1, and compared with the traditional static pressure method, the compressive strength of the sample can be improved; compared with comparative example 1, the example 2 provided with periodic lamination units and the distinguishing arrangement of the filling material and the caulking material has obvious compressive strength improvement, and the preparation method provided by the invention has the advantage that the bearing capacity and the cracking resistance can be obviously improved.
Table 9 strength and modulus of two materials at different ages
Compared with the prior art, the invention provides a filling type large-particle-size cement stabilized macadam base and a forming process thereof, wherein fine aggregate is divided into filling materials and caulking materials, a proper raw material proportion and a proper grading mode are selected, a periodic laminated structure is arranged at the same time, a material collecting layer is formed after vibration compaction treatment, and the filling type large-particle-size cement stabilized macadam base is obtained after health maintenance; the molding process can remarkably improve the compressive strength and the cracking resistance of the highway base material, and can be applied as the highway base material.
It should be noted that, the foregoing embodiments all belong to the same inventive concept, and the descriptions of the embodiments have emphasis, and where the descriptions of the individual embodiments are not exhaustive, reference may be made to the descriptions of the other embodiments.
The foregoing examples merely illustrate embodiments of the invention and are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The filling type large-particle-size cement stabilized macadam base is characterized by comprising the following raw materials in parts by weight: 9-12 parts of large-particle-size broken stone, 9-10 parts of filler, 0.3-0.8 part of caulking material, 0.7-1.2 parts of cement and 0.8-1.2 parts of water;
the large-particle-size broken stone, the filling material and the caulking material are subjected to vibration compaction treatment to form an aggregate layer, and the aggregate layer is of a laminated structure formed by periodically paving the large-particle-size broken stone, the filling material and the caulking material; and paving water and cement on the aggregate layer in sequence, and curing to form the filled large-particle-size cement stabilized macadam base layer.
2. The filled large-particle-size cement stabilized macadam base as claimed in claim 1, wherein the filled large-particle-size cement stabilized macadam base is composed of the following raw materials in parts by mass: 10 parts of large-particle-size broken stone, 9.5 parts of filler, 0.5 part of caulking material, 1 part of cement and 1 part of water.
3. The filled large-particle-size cement stabilized macadam base as claimed in claim 1, wherein the large-particle-size macadam has a particle size of 40-60 mm, a crushing value of 14.2%, a needle-like particle content of 17.2% and a relative density of 2.61g/cm 3 。
4. The filled large-grain cement stabilized macadam foundation of claim 1, wherein the filler and caulking material have a content of organic matter of 0.6% or less, a sulfate content of 0.1% or less, and a relative density of 2.61g/cm 3 Methylene blue value<3。
5. The filled large-particle-size cement stabilized macadam foundation according to claim 1, wherein the particle size of the filling material is divided into 3 grades, and the filling material comprises a first grade with the particle size of 0-5 mm, a second grade with the particle size of 5-10 mm and a third grade with the particle size of 10-15 mm;
the mass ratio of the first gear to the second gear to the third gear of the filling material is 6:2.5:1.5.
6. The filled large-grain-size cement stabilized macadam foundation of claim 1, wherein the caulking compound has a grain size of 2 steps, including a first step with a grain size of 0-5 mm and a second step with a grain size of 5-10 mm;
the mass ratio of the first gear to the second gear of the caulking material is 6:4.
7. A process for forming a filled large-particle-diameter cement stabilized macadam base as claimed in any one of claims 1 to 6, comprising the steps of:
s1, weighing raw materials according to a proportion, sequentially paving large-particle-size broken stones, filling materials and caulking materials, and obtaining a material collecting layer after vibration compaction treatment;
s2, paving water and cement on the aggregate layer in sequence, and curing to form the filled large-particle-size cement stabilized macadam base layer.
8. The process for forming a filled large-particle-size cement stabilized macadam foundation according to claim 7, wherein the step S1 is specifically:
sequentially paving the large-particle-size broken stone and the filling material to form a laminated unit, and vibrating after paving one laminated unit each time;
and after three laminated units are paved periodically, filling the caulking material at the edge, and compacting until the surface is flat, thus obtaining the aggregate layer.
9. The process for forming a filled large-particle-size cement stabilized macadam foundation according to claim 8, wherein in step S1, a surface vibration compaction machine is used for vibration compaction treatment;
after each laying of one laminated unit, the laminated unit is vibrated for 150s, the vibration frequency is 60Hz, and the rotating speed is 1400 rpm.
10. The process for forming a filled large-particle size cement stabilized macadam foundation according to claim 7, wherein in the step S2, the conditions for curing are as follows: the relative humidity is 93-97%, and the temperature is 19-21 ℃ until the cement is finally set.
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