CN112834369A - Method for determining reasonable water content of solid waste doped road base material - Google Patents
Method for determining reasonable water content of solid waste doped road base material Download PDFInfo
- Publication number
- CN112834369A CN112834369A CN202011608979.2A CN202011608979A CN112834369A CN 112834369 A CN112834369 A CN 112834369A CN 202011608979 A CN202011608979 A CN 202011608979A CN 112834369 A CN112834369 A CN 112834369A
- Authority
- CN
- China
- Prior art keywords
- compaction
- water content
- solid waste
- mixture
- reasonable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/42—Road-making materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for determining reasonable water content of a solid waste doped road base layer material, which aims at the situation that solid waste is used for an inorganic binding material stable base layer, can determine a reasonable indoor compaction forming method according to characteristics of the solid waste and characteristics of a mixture compaction process, and ensures that the solid waste is less broken and the mixture gradation is close to the design gradation in the compaction, so that the compacted water content of the mixture is more reasonable, the actual compaction requirement is met, the water loss shrinkage cracking of the solid waste doped road base layer in the health preserving period is reduced, and a basis is provided for the design and construction of the solid waste used for the road base layer.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a method for determining reasonable water content of a solid waste doped road base material.
Background
The construction waste (including road recycling materials), industrial solid waste (such as steel slag and tailings) and other bulk solid wastes face the dilemma of resource utilization, and can partially or completely replace broken stones to be used as road base materials, so that the resource utilization of the solid wastes is realized. The solid waste generally has physical and mechanical properties of strong water absorption, prominent edges and corners, low crushing strength and the like, and the solid waste replaces broken stones to carry out mix proportion design and is compared with the conventional inorganic binder stabilized base mixture, so that the two main key technical problems exist: (1) the situation that solid waste particles are crushed in the rearrangement process in the compaction forming process is serious, so that the actual mineral aggregate gradation and the designed mineral aggregate gradation have large deviation, and the particles are less crushed in the actual field vibration compaction process, so that the deviation between the indoor design result of the mixture and the actual situation occurs, and the actual road base strength is often underestimated; (2) the solid waste particles have more pores and strong water absorption, the water content of the mixture comprises lubricating water required by particle movement in compaction and adsorption water of the solid waste, the compacted water content determined by an indoor conventional compaction test is increased, so that the water content is used as the construction water content to cause the increase of water loss and drying shrinkage deformation of a base layer of the mixture, and the early cracking of the base layer is aggravated.
The compaction method for determining reasonable water content in the road base layer mixture chamber needs to be similar to the compaction action and compaction work of an actual road roller, and currently, two methods of compaction and vibration compaction are mainly adopted. The external force and compaction work provided by different compaction methods are different, and the motion rules of the aggregate particles in the mixture in the compaction process are different, so that the embedding and extrusion state of the aggregate particles after compaction and the mechanical strength of the mixture are different. The vertical hammering force is adopted in compaction forming to enable aggregate particles to mainly move downwards to reach a compact state, which is equivalent to a 12-15 ton static press, and the compaction work is a fixed value and cannot well reflect the compaction work of the existing on-site real compaction equipment. The vibration compaction is realized by applying vibration with certain frequency and amplitude on the surface of a mixture test piece to ensure that particles are liquefied to reach a compact state. The change process of the aggregate state in the test piece cannot be recorded in the compaction and vibration forming processes, and the compaction process or the result can only be judged through the whole physical and mechanical indexes of the mixture after the compaction and vibration forming processes are finished. Rotary compaction is another compaction method commonly used for pavement materials, and is used for compacting asphalt mixtures and evaluating the performance of the asphalt mixtures by collecting materials, arranging the materials in a fixed direction and compacting the mixtures under the combined action of vertical force and shearing force by means of a rotary compactor, and can also be applied to indoor molding of road engineering materials such as cement concrete, coarse-grained soil and the like. The rotary compaction can better reflect the real compaction state of the material to a certain extent, and the compaction information in the compaction process can be recorded by the rotary compactor so as to be used for analyzing the compaction process characteristics. But the parameters of the rotary compaction forming instrument are more, and the most reasonable test parameters of different compaction materials also have differences.
In summary, the indoor compaction of the road base material doped with solid waste should ensure that the mineral aggregate gradation, the aggregate particle embedding and extruding state and the mixture mechanical strength are consistent with the field compaction result, and also should consider the specific physical mechanical characteristics of the solid waste, and also should define the influence of the form and physical mechanical characteristics of different types of solid waste on the compaction process, which is not fully realized due to the reasons of equipment, test parameters and the like in the current compaction test and vibration forming.
Disclosure of Invention
The invention aims to solve the problems that: the method for determining the reasonable water content of the solid waste doped road base material is provided, different indoor compaction test parameters are adopted for different solid wastes to simulate actual compaction work, the solid waste particle arrangement and the mixture strength are close to the actual compaction of the base, and the accuracy of the indoor solid waste doped road base material design is improved.
The technical scheme provided by the invention for solving the problems is as follows: a method of determining a reasonable moisture content of solid waste doped road base material, the method comprising the steps of,
the method comprises the following steps: mixing the solid waste with aggregate and water with pre-estimated water content according to a designed mixing proportion, mixing the solid waste with the aggregate, and then adding an inorganic binder to mix to obtain a mixture;
step two: putting the plastic film bag into a rotary compaction instrument test mold, attaching the plastic film bag to the inner wall of the test mold, and filling the mixture obtained in the first step into the test mold in three layers;
step three: adopting a rotary compaction instrument to perform rotary compaction molding on the mixture;
step four: obtaining a relation curve of the compaction times of the mixture and the shearing stress and a relation curve of the vertical pressure and the crushing rate of the mineral aggregate according to data recorded by a rotary compactor;
step five: determining reasonable vertical pressure and reasonable compaction times of the mixture according to the characteristics of a relation curve of compaction times and shearing stress and a relation curve of vertical pressure and mineral aggregate breakage rate;
step six: according to the reasonable compaction times and the reasonable vertical pressure, the five water contents are changed to carry out rotary compaction forming on the mixture, and a relation curve between the water content and the dry density is obtained;
step seven: and fitting the convex trend of the water content and the dry density by adopting a quadratic function, wherein the water content and the dry density corresponding to the peak value of a fitting curve are respectively the optimal water content and the maximum dry density, and the reasonable water content of the mixture is the optimal water content plus 0.3-0.5%.
Preferably, the solid waste refers to industrial solid waste or construction waste with aggregate characteristics, the aggregate refers to natural broken stone meeting road engineering technical specifications, the inorganic binder refers to cement, lime or fly ash, and the mixture is a mixture of inorganic binder stable solid waste and broken stone.
Preferably, the water content in the first step is the percentage of the mass of the mixture of water, solid waste and crushed stone.
Preferably, the rotary compactor is provided with a shear stress test system, the test mold is an accessory of the rotary compactor, the inner diameter is 149.9-150 mm, the height is 250 +/-1 mm, and the size of the thin film plastic bag is larger than 30 cm multiplied by 20 cm and is waterproof.
Preferably, the vertical pressure of the rotary compaction molding in the third step is 400-700 kPa, and the compaction times are 150-300; the vertical pressure is the vertical pressure applied to the mixture by the rotary compaction instrument, and the compaction times are the times of rotation of the base of the rotary compaction instrument.
Preferably, the speed of the rotary compaction in the third step is 30r/min +/-0.5 r/min, and the internal rotation angle of the rotary compaction is 1.16 degrees +/-0.02 degrees.
Preferably, the breakage rate is the sum of the absolute values of the passing mass percentage of the mineral aggregates on 2.36, 4.75, 9.5, 13.2, 16, 19, 26.5 and 31.5 mm mesh in the mixture after the gyratory compaction test and the difference of the design gradation.
Preferably, the relationship curve of compaction times and shearing stress and the relationship curve of vertical pressure and mineral aggregate breakage rate in the fourth step are characterized in that the compaction times at the end of the re-compaction stage are taken as reasonable compaction times, and the vertical pressure when the breakage rate on the relationship curve of vertical pressure and breakage rate is stable is taken as reasonable vertical pressure.
Preferably, the five water contents in the sixth step are respectively estimated water content, estimated water content +/-0.5% and estimated water content +/-1.0%.
Compared with the prior art, the invention has the advantages that:
(1) the change of the shear stress and the density in the road base material compaction process is obtained by adopting a rotary compactor, the mixture compaction process and the compaction mechanism are accurately known in real time, and reference is provided for the indoor design of the solid waste doped road base layer material;
(2) the crushing resistance and compaction characteristics of road base materials doped with different solid wastes are different, and test parameters of a rotary compactor can be determined according to the compaction work level of an on-site actual road roller by obtaining the influence of compaction times and vertical pressure on the compaction characteristics of a mixture in the rotary compaction process;
(3) the crushing of solid waste particles in the compaction process is reduced, and the design gradation and the embedded extrusion state of the mixture are ensured to be consistent with the actual gradation, aggregate distribution and mixture strength after the base layer is compacted on site;
(4) the kneading effect of the on-site road roller is simulated by the rotary compactor, so that the particle motion in the road base material doped with the solid wastes is more consistent with the on-site compaction rule, and the requirement on water lubrication effect is reduced compared with a heavy compaction test, thereby ensuring that the mixture is compacted under lower water content, and providing scientific basis for reducing the reasonable water content of the road base material doped with the solid wastes.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a graph showing the relationship between compaction frequency and shear stress under different vertical pressures.
FIG. 2 is a graph showing the relationship between the number of compactions and the degree of crushing according to the present invention.
FIG. 3 is a schematic diagram showing the relationship between water content and dry density according to the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, so that how to implement the technical means for solving the technical problems and achieving the technical effects of the present invention can be fully understood and implemented.
Example 1
In this example, road base material was prepared by using industrial solid waste instead of crushed stone, and the water absorption of the industrial solid waste was 8.5% and the crush value was 7.3%, and the water absorption of the crushed stone was 1.7% and the crush value was 10.2%, as measured by a method in road engineering aggregate test specification (JTG E42-2005). It can be seen that the water absorption and crush resistance of the industrial solid waste are both greater than those of crushed stone. The solid waste mixed material comprises the following components in percentage by weight: solid waste: 70% of cement: 30%: 4.5 percent, and the design grade of the mixture is shown in the table 1. The method comprises the following steps of determining the reasonable water content of the mixture by adopting a rotary compaction instrument:
step S1: according to the design mixing proportion, mixing the solid waste with aggregate and water with the estimated water content of 8%, and then adding PC325 cement for mixing to obtain a mixture.
Step S2: and (3) putting the plastic film bag into a test mold of a rotary compaction instrument, fitting the inner wall of the test mold, and loading the mixture into the test mold in three layers.
Step S3: and (3) performing a rotary compaction forming test on the mixture by adopting a rotary compactor, wherein the vertical pressure is 400 kPa, 500kPa, 600kPa and 700kPa respectively, and the maximum rotary compaction frequency is 300 times.
Step S4: and obtaining a relation curve of the mixture compaction times and the shearing stress according to the data recorded by the rotary compactor, and referring to fig. 1. In fig. 1, the compaction process can be divided into three stages, namely, initial compaction, secondary compaction and final compaction, which are respectively represented as 1 stage, 2 stage and 3 stage in the figure according to the change of the shearing stress along with the compaction times. Immediately after rotary compaction, the mix was subjected to a screening test in accordance with the test protocol for inorganic binder stabilized materials for road engineering (JTG E51-2009) to obtain a percent mass of mineral material passing through 2.36, 4.75, 9.5, 13.2, 16, 19, 26.5 and 31.5 mm openings, and the difference between each opening and the design grading and the percentage of mineral material breakage were calculated and the results are shown in table 1. From this, a vertical pressure-mineral aggregate breakage rate relationship curve is obtained, see fig. 2.
Step S5: and analyzing the characteristics of a relationship curve of the compaction times and the shearing stress and a relationship curve of the mineral aggregate breakage rate and the vertical pressure. In fig. 1, after the re-compaction phase is finished when the mixture is rotationally compacted for 200 times, the change of the shearing stress along with the compaction times tends to be flat, which indicates that the mixture reaches a better embedded and extruded state after the mixture is rotationally compacted for 200 times. Fig. 2 shows that when the number of times of rotary compaction is 200, the crushing rate tends to increase along with the increase of the vertical pressure, the crushing rate of the mineral aggregate increases obviously after the vertical pressure exceeds 500kPa, and the crushing rates at the vertical pressures of 600kPa and 700kPa are similar, which indicates that the crushing rate does not change obviously any more after the vertical pressure of 600kPa, and the mixture reaches a better embedded and extruded state. Accordingly, the reasonable vertical pressure and the reasonable compaction times of the mixture are respectively determined to be 600kPa and 200 times according to the characteristics of the two relation curves.
Step S6: according to the reasonable vertical pressure and the reasonable compaction times, namely 600kPa and 200 times, five water contents of 7.5%, 8.0%, 8.5%, 9% and 9.5% are adopted to carry out a rotary compaction forming test on the mixture to obtain a relation curve of the water content and the dry density, and the water content is the actually measured water content of the mixture in the graph shown in figure 3.
Step S7: as shown in FIG. 3, the water content and the dry density have convex variation trends, and a quadratic function is adopted to fit the convex trends of the water content and the dry density in FIG. 3. In FIG. 3, the solid line 1 is a curve relating water content to dry density, the dotted line 2 is a quadratic function fitting curve, the abscissa corresponding to the dotted line 3 is the optimum water content of 8.5%, and the ordinate corresponding to the dotted line 4 is the maximum dry density of 2.138g cm-3. The reasonable water content of the mixture is the optimal water content which is 8.8-9.0 percent and is 0.3-0.5 percent.
TABLE 1 mixture design grading and grading after rotary compaction with different vertical pressures (number of rotary compaction 200)
Example 2
The effect of the plastic film bags was verified in this example using the industrial solid waste blended road base material of example 1. The test parameters adopted in the rotary compaction test are 600kPa, the rotary compaction times are 200 times, and the designed water content and the actually measured water content of the mixture are shown in the table 2. The data in table 2 show that the absolute value of the difference value between the actually measured water content and the designed water content of the mixture is small under the condition of the thin-film plastic bag compared with the condition of the thin-film plastic bag; under the condition of no film plastic bag, the higher the designed water content is, the larger the absolute value of the difference value between the actually-measured water content and the designed water content is. Therefore, the excessive loss of water in the rotary compaction process can be avoided by using the film plastic bag, so that the target water content is close to the actual water content, the actual base layer rolling condition can be simulated, and the water retention effect of the film plastic bag is more obvious when the designed water content of the mixture is higher.
TABLE 2 Water content results of the mixes with and without plastic bags
Example 3
This example uses solid waste different from that of examples 1 and 2, and verifies that the method of the present invention is applicable to solid waste of different characteristics. In this example, the road base material is prepared by using construction waste instead of crushed stone, and the water absorption and crushing value of the construction waste are respectively 9.5% and 29.4% and 1.7% and 10.2% according to the method in the highway engineering aggregate test regulation (JTG E42-2005). Therefore, the water absorption of the construction waste is far greater than that of the broken stone, and the anti-crushing capability is lower than that of the broken stone. Compared with the industrial solid wastes in the examples 1 and 2, the construction wastes in this example have slightly higher water absorption and lower crushing resistance. The solid waste mixed material comprises the following components in percentage by weight: solid waste: 70% of cement: 30%: 4.5 percent. The method comprises the following steps of determining the reasonable water content of the mixture by adopting a rotary compaction instrument:
step S1: according to the design mixing proportion, mixing the solid waste with aggregate and water with the estimated water content of 8%, and then adding PC325 cement for mixing to obtain a mixture.
Step S2: and (3) putting the plastic film bag into a test mold of a rotary compaction instrument, fitting the inner wall of the test mold, and loading the mixture into the test mold in three layers.
Step S3: and (3) performing a rotary compaction forming test on the mixture by adopting a rotary compactor, wherein the vertical pressure is 400 kPa, 500kPa, 600kPa and 700kPa respectively, and the maximum rotary compaction frequency is 300 times.
Step S4: and obtaining a relation curve of the compaction times of the mixture and the shearing stress according to the data recorded by the rotary compactor. Immediately after the rotary compaction, the mixture was subjected to a screening test to obtain the passing mass percentages of the mineral aggregates on 2.36, 4.75, 9.5, 13.2, 16, 19, 26.5 and 31.5 mm mesh openings, and the mineral aggregate breakage rate was calculated to obtain the vertical pressure-mineral aggregate breakage rate relationship curve.
Step S5: and analyzing the characteristics of a relationship curve of the compaction times and the shearing stress and a relationship curve of the mineral aggregate breakage rate and the vertical pressure. For the relation curve of compaction times and shearing stress, the rotary compaction times at the end of the re-compaction are 180 times, which shows that the mixture reaches a better embedded extrusion state after 180 times of rotary compaction. For the relation curve of vertical pressure and mineral aggregate breakage rate, when the number of times of rotary compaction is 180 times, the breakage rate does not change obviously after the vertical pressure is 500kPa, and the mixture reaches a better embedding and extruding state. Accordingly, the reasonable vertical pressure and the reasonable compaction times of the mixture are respectively determined to be 500kPa and 180 times according to the characteristics of the two relation curves.
Step S6: and performing a rotary compaction forming test on the mixture by adopting five water contents of 7.5%, 8.0%, 8.5%, 9% and 9.5% according to reasonable vertical pressure and reasonable compaction times, namely 500kPa and 180 times, so as to obtain a relation curve of the water content and the dry density.
Step S7: fitting the convex trend of the water content and the dry density by using a quadratic function to obtain the water content with the optimal value of 8.8 percent and the maximum dry density of 2.122 g-cm-3. The reasonable water content of the mixture is 9.1-9.3% of the optimal water content plus 0.3-0.5%.
Compared with the embodiment 1, the embodiment adopts the solid wastes with higher water absorption and smaller anti-crushing capacity to design the road base material, the vertical pressure determined by the method is smaller, the compaction times are fewer, and the reasonable water content is slightly higher. Therefore, the method can adopt different test parameters aiming at different solid wastes, and the determined reasonable water content of the solid waste doped base material is more scientific.
Example 4
In the implementation, the mixed materials in the embodiment 1 and the embodiment 3 are adopted, and the reasonable water content is determined by respectively adopting a heavy compaction method according to the highway engineering inorganic binder stable material test regulation (JTG E51-2009), so that the advantages of the invention compared with the conventional method are shown, and the results are shown in Table 3. In addition, the method is used for guiding the construction of the actual solid waste doped base layer, and the reasonable water content result of the solid waste doped base layer material determined by the method and the heavy compaction method is shown in the table 3.
The unconfined compressive strength of the actual solid waste doped base course was determined by reference to the method in the road engineering inorganic binder stabilized materials test protocol (JTG E51-2009) and the results are shown in table 3.
The results in table 3 show that the reasonable water content determined by the heavy compaction test is higher than that determined by the method of the invention, and is averagely higher than 0.2-0.3%; the crushing rate in the heavy compaction test is higher than that in the method, which indicates that the solid waste is seriously crushed by the conventional method; the unconfined compressive strength of the actual solid waste doped base drill core sampling test piece is 4.7MPa, which is closer to the unconfined compressive strength determined by the method of the invention and is higher than the unconfined compressive strength of the test piece by a static pressure method. This example demonstrates that the method of the invention directs the actual incorporation of a solid waste substrate to be very close to indoor compaction, and that the method of the invention has advantages over conventional methods for incorporation of solid waste substrate materials.
TABLE 3 comparison of the method of the invention with the results determined in the compaction (hydrostatic) test
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (9)
1. A method for determining reasonable water content of solid waste doped road base material is characterized by comprising the following steps: the method comprises the following steps of,
the method comprises the following steps: mixing the solid waste with aggregate and water with pre-estimated water content according to a designed mixing proportion, mixing the solid waste with the aggregate, and then adding an inorganic binder to mix to obtain a mixture;
step two: putting the plastic film bag into a rotary compaction instrument test mold, attaching the plastic film bag to the inner wall of the test mold, and filling the mixture obtained in the first step into the test mold in three layers;
step three: adopting a rotary compaction instrument to perform rotary compaction molding on the mixture;
step four: obtaining a relation curve of the compaction times of the mixture and the shearing stress and a relation curve of the vertical pressure and the crushing rate of the mineral aggregate according to data recorded by a rotary compactor;
step five: determining reasonable vertical pressure and reasonable compaction times of the mixture according to the characteristics of a relation curve of compaction times and shearing stress and a relation curve of vertical pressure and mineral aggregate breakage rate;
step six: according to the reasonable compaction times and the reasonable vertical pressure, the five water contents are changed to carry out rotary compaction forming on the mixture, and a relation curve between the water content and the dry density is obtained;
step seven: and fitting the convex trend of the water content and the dry density by adopting a quadratic function, wherein the water content and the dry density corresponding to the peak value of a fitting curve are respectively the optimal water content and the maximum dry density, and the reasonable water content of the mixture is the optimal water content plus 0.3-0.5%.
2. The method of determining reasonable water content of solid waste doped road base material according to claim 1, wherein: the solid waste refers to industrial solid waste or construction waste with the characteristic of aggregate, the aggregate refers to natural macadam meeting the technical specification of road engineering, the inorganic binder refers to cement, lime or fly ash, and the mixture is a mixture of inorganic binder stable solid waste and macadam.
3. The method of claim 2, wherein the method comprises the steps of: and in the first step, the water content is the percentage of the mass of the mixture of the water, the solid waste and the crushed stones.
4. The method of determining reasonable water content of solid waste doped road base material according to claim 1, wherein: the rotary compactor is provided with a shear stress test system, the test mold is an accessory of the rotary compactor, the inner diameter is 149.9-150 mm, the height is 250 +/-1 mm, and the size of the thin film plastic bag is larger than 30 cm multiplied by 20 cm and is waterproof.
5. The method of determining reasonable water content of solid waste doped road base material according to claim 1, wherein: in the third step, the vertical pressure of the rotary compaction molding is 400-700 kPa, and the compaction times are 150-300; the vertical pressure is the vertical pressure applied to the mixture by the rotary compaction instrument, and the compaction times are the times of rotation of the base of the rotary compaction instrument.
6. The method of determining reasonable water content of solid waste doped road base material according to claim 1 or 5, wherein: in the third step, the speed of rotary compaction is 30r/min +/-0.5 r/min, and the internal rotation angle of the rotary compaction is 1.16 degrees +/-0.02 degrees.
7. The method of determining reasonable water content of solid waste doped road base material according to claim 1, wherein: the breakage rate is the sum of the absolute values of the passing mass percentage of mineral aggregates on 2.36, 4.75, 9.5, 13.2, 16, 19, 26.5 and 31.5 mm sieve holes in the mixture after the rotary compaction test and the difference value of the design gradation.
8. The method of determining reasonable water content of solid waste doped road base material according to claim 1, wherein: and the characteristics of the relation curve of the compaction times and the shearing stress and the relation curve of the vertical pressure and the mineral aggregate breakage rate in the fourth step take the compaction times at the end of the re-compaction stage as reasonable compaction times and take the vertical pressure when the breakage rate on the relation curve of the vertical pressure and the breakage rate is stable as reasonable vertical pressure.
9. The method of determining reasonable water content of solid waste doped road base material according to claim 1, wherein: and in the sixth step, the estimated water content +/-0.5% and the estimated water content +/-1.0% are respectively carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011608979.2A CN112834369A (en) | 2020-12-30 | 2020-12-30 | Method for determining reasonable water content of solid waste doped road base material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011608979.2A CN112834369A (en) | 2020-12-30 | 2020-12-30 | Method for determining reasonable water content of solid waste doped road base material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112834369A true CN112834369A (en) | 2021-05-25 |
Family
ID=75925370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011608979.2A Pending CN112834369A (en) | 2020-12-30 | 2020-12-30 | Method for determining reasonable water content of solid waste doped road base material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112834369A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040099672A (en) * | 2003-05-19 | 2004-12-02 | 재단법인 한국건자재시험연구원 | Asphalt concrete using the mixed wastes plastics |
| US20080249729A1 (en) * | 2002-05-24 | 2008-10-09 | David Frederick Martinez | Systems and methods for real time hot mix asphalt production |
| CN103472214A (en) * | 2013-09-12 | 2013-12-25 | 东南大学 | Method for determining optimum water content of emulsified asphalt cold-recycling mixture |
| CN106431145A (en) * | 2016-10-08 | 2017-02-22 | 山东省交通科学研究院 | Cement-stabilized-macadam mixture design method |
| CN106525534A (en) * | 2016-11-11 | 2017-03-22 | 沈阳建筑大学 | Water-absorbing device for cold-recycling test of gyratory compactor and test method |
| CN106977148A (en) * | 2017-04-24 | 2017-07-25 | 广州大学 | A kind of cement stabilized recycled concrete aggregate rubble proportion design method |
| CN109765102A (en) * | 2019-03-13 | 2019-05-17 | 长安大学 | A kind of asphalt multi-step rotation debulking methods and its application |
| CN111397991A (en) * | 2020-05-13 | 2020-07-10 | 长安大学 | Vibration compaction method for measuring maximum dry density and optimum water content of roadbed filler |
-
2020
- 2020-12-30 CN CN202011608979.2A patent/CN112834369A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080249729A1 (en) * | 2002-05-24 | 2008-10-09 | David Frederick Martinez | Systems and methods for real time hot mix asphalt production |
| KR20040099672A (en) * | 2003-05-19 | 2004-12-02 | 재단법인 한국건자재시험연구원 | Asphalt concrete using the mixed wastes plastics |
| CN103472214A (en) * | 2013-09-12 | 2013-12-25 | 东南大学 | Method for determining optimum water content of emulsified asphalt cold-recycling mixture |
| CN106431145A (en) * | 2016-10-08 | 2017-02-22 | 山东省交通科学研究院 | Cement-stabilized-macadam mixture design method |
| CN106525534A (en) * | 2016-11-11 | 2017-03-22 | 沈阳建筑大学 | Water-absorbing device for cold-recycling test of gyratory compactor and test method |
| CN106977148A (en) * | 2017-04-24 | 2017-07-25 | 广州大学 | A kind of cement stabilized recycled concrete aggregate rubble proportion design method |
| CN109765102A (en) * | 2019-03-13 | 2019-05-17 | 长安大学 | A kind of asphalt multi-step rotation debulking methods and its application |
| CN111397991A (en) * | 2020-05-13 | 2020-07-10 | 长安大学 | Vibration compaction method for measuring maximum dry density and optimum water content of roadbed filler |
Non-Patent Citations (9)
| Title |
|---|
| 刘 栋等人: "旋转压实成型水泥稳定类基层材料试验", 中国公路学报, vol. 32, no. 11, pages 118 - 128 * |
| 庞立果: "不同成型方法对乳化沥青混合料设计参数影响", 广 东 交 通 职 业 技 术 学 院 学 报, vol. 12, no. 4, pages 19 - 22 * |
| 李立寒;黄璞;刘栋;: "旋转与静压成型对水泥稳定碎石性能的影响", 长安大学学报(自然科学版), no. 06, pages 17 - 25 * |
| 王萌等人: "重载铁路道砟旋转压实特性及参数优化试验研究", 铁道科学与工程学报, vol. 17, no. 10, pages 2503 - 2515 * |
| 祝凤丹;谢若奇;陈明辉;谭振宇;: "水泥稳定碎石基于旋转压实的压实次数与相关参数的研究", 广东建材, no. 02, pages 10 - 12 * |
| 谭洪河;蔡旭;王和林;黄鲲;伍圣华;: "基于旋转压实的水泥稳定再生集料设计方法", 公路交通科技, no. 10, pages 118 - 128 * |
| 邹维列, 王钊, 杨志强: "路基粒状填土的旋转压实试验", 岩土力学, no. 11, pages 1775 - 1778 * |
| 钱树波;: "旋转压实方法在无机结合稳定料压实性能试验中的应用", 市政技术, no. 04, pages 192 - 193 * |
| 铁怀民;: "压实参数对试件密度和抗剪强度的影响", 交通科学与工程, no. 01, pages 32 - 37 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Molenaar et al. | Effects of gradation, composition, and degree of compaction on the mechanical characteristics of recycled unbound materials | |
| Amu et al. | The suitability and lime stabilization requirement of some lateritic soil samples as pavement | |
| Xiao et al. | Gradation effects influencing mechanical properties of aggregate base–granular subbase materials in Minnesota | |
| US6867249B2 (en) | Lightweight and porous construction materials containing rubber | |
| Vavrik et al. | Aggregate blending for asphalt mix design: Bailey method | |
| Al-Aghbari et al. | Stabilisation of desert sands using cement and cement dust | |
| Vieira et al. | Use of mixed construction and demolition recycled materials in geosynthetic reinforced embankments | |
| AU2008200246A1 (en) | Aggregate for concrete and construction | |
| Abdi et al. | Effects of discrete short polypropylene fibers on behavior of artificially cemented kaolinite | |
| Moreira et al. | Impact of sustainable granular materials on the behavior sedimentary silt for road application | |
| EP1089950B1 (en) | a method of IMPROVING THE ENGINEERING PROPERTIES OF SOIL | |
| Ding et al. | Performance evaluation of recycled asphalt mixtures containing construction and demolition waste applicated as pavement base | |
| Chandra et al. | Evaluation of Mix Design Methods for Reclaimed Asphalt Pavement Mixes with Foamed Bitumen | |
| Omotosho et al. | Behaviour of soils (lateritic) subjected to multi-cyclic compaction | |
| CN112834369A (en) | Method for determining reasonable water content of solid waste doped road base material | |
| Liu et al. | Performance of cement-stabilized macadam roads based on aggregate gradation interpolation tests | |
| Karim et al. | Influence of fly ash addition on behavior of soft clayey soil | |
| Chen et al. | Improved design method of emulsified asphalt cold recycled mixture | |
| CN115521113A (en) | Method for treating waste muck of pipe jacking in sandstone stratum | |
| Ye Htun et al. | Investigation of bottom ash as a partial replacement to conventional subbase soils | |
| Edeh et al. | Reclaimed asphalt pavement stabilized using crushed concrete waste as highway pavement material | |
| Takahashi et al. | Improvement of mix design for porous asphalt | |
| Choudhury et al. | Development and evaluation of coal mine waste materials for gainful utilization | |
| Gabryś et al. | Compaction characteristics of waste materials: Recycled concrete aggregate, recycled rubber waste, and recycled concrete aggregate− recycled rubber waste mixtures | |
| CN111721605A (en) | Simulation test-based anti-cracking cement stabilized macadam mix proportion design method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |