CN111831961A - Cement dose estimation method and system for skeleton compact type cement stabilized macadam - Google Patents

Cement dose estimation method and system for skeleton compact type cement stabilized macadam Download PDF

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CN111831961A
CN111831961A CN202010752462.4A CN202010752462A CN111831961A CN 111831961 A CN111831961 A CN 111831961A CN 202010752462 A CN202010752462 A CN 202010752462A CN 111831961 A CN111831961 A CN 111831961A
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刘树堂
曹卫东
左志武
房建果
王飞
刘健
代金国
刘时俊
栾娟
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Shandong High Speed Group Co Ltd
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Abstract

The invention discloses a cement dosage estimation method for skeleton compact type cement stabilized macadam, which adopts the technical scheme that: the method comprises the following steps: designing a skeleton compact grading curve, obtaining mineral aggregate grading with smaller mineral aggregate clearance rate, and obtaining density parameters; establishing a cement content estimation formula; obtaining a predicted value of the cement content according to the density parameter and a cement content prediction formula; the cement dosage for the test is determined based on the estimated value, and the optimal cement dosage is obtained through the confirmation of the performance test. The invention can determine the reasonable minimum cement dosage of the skeleton dense gradation by a small amount of experiments.

Description

Cement dose estimation method and system for skeleton compact type cement stabilized macadam
Technical Field
The invention relates to the technical field of semi-rigid base pavement materials, in particular to a cement dosage estimation method and system for skeleton compact type cement stabilized macadam.
Background
After the cement stabilized macadam material is compacted and formed, the internal coarse aggregate and cement mortar show a spatial latticed distribution state. According to the difference of the proportional relation between the volume of the gap formed by the coarse aggregate and the volume of cement mortar which plays a role of filling the gap, the structural types of the cement stabilized macadam can be divided into three types of distribution states, namely a suspension compact type, a framework gap type and a framework compact type structure.
The suspension compact type mixture is a continuous compact type graded mixture formed according to a certain compact rule and continuously distributed from large to small in aggregate particle size, and large particles suspend in small particles, have higher compactness and cannot form an effective coarse material framework inside the suspension compact type mixture. The skeleton gap type mixture is continuous open-graded mixture with high coarse aggregate content, and the large size aggregate in the mixture contacts closely to form effective skeleton structure while the small size aggregate cannot fill the gap between the skeletons.
The dense mixture of the framework is based on a filling theory, so that the larger particles are in close contact with each other to form an effective framework structure, and the particles with the primary particle size fully fill the framework gap to form a relatively dense mixture structure. The strength of the mixture is simultaneously influenced by the strength of the self skeleton of the material and the binding power of the cement cementing material. The compact grading of the framework has smaller mineral aggregate clearance rate, so that lower cement dosage can be adopted, higher strength can be generated, and the composite material has excellent anti-cracking performance and anti-scouring performance.
Regardless of the type of grading, the strength properties, modulus of restitution, of cement stabilized macadam generally exhibit a significant positive correlation with cement dosage. Higher cement dosage can significantly improve the strength and rigidity characteristics of the cement stabilized macadam, but can also bring about more severe material shrinkage and crack generation. When the grading optimization design is not studied, the lower cement dosage can cause the lower strength, the poorer integrity and the weakened bearing capacity of the cement-stabilized macadam. Usually, although the minimum cement dosage meeting the requirement of the strength standard can be obtained through more trial tests, a large amount of tests are long in time consumption and large in test workload, and are not easily accepted by engineering testers. Therefore, after the cement stabilized macadam is designed into a framework compact structure, a method for estimating the appropriate dosage of cement is established to avoid the problems brought by trial experiments, so that the method is significant and necessary, and the dosage of the cement obtained based on framework compact grading is low.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a cement dosage estimation method and a system for skeleton compact type cement stabilized macadam, and a reasonable minimum cement dosage is determined through a few tests.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, embodiments of the present invention provide a method for estimating cement dosage of a framework compact cement stabilized macadam, comprising:
designing a skeleton compact grading curve, obtaining mineral aggregate grading with smaller mineral aggregate clearance rate, and obtaining density parameters;
establishing a cement content estimation formula;
obtaining a predicted value of the cement content according to the density parameter and a cement content prediction formula;
the cement dosage for the test is determined based on the estimated value, and the optimal cement dosage is obtained through the confirmation of the performance test.
As a further implementation mode, the method for establishing the cement dosage estimation formula comprises the following steps:
and establishing a gap rate calculation formula of the graded mineral aggregate, and performing a series of derivation operations to obtain a cement content estimation formula.
As a further stepThe implementation mode is that the mass of the cement stabilized macadam is regarded as the sum of aggregate, cement and moisture absorbed by hydration of the cement, and the theoretical maximum density gamma of the cement stabilized macadam is established0The formula:
Figure BDA0002610466670000031
wherein, γsaRepresenting the apparent density, P, of the synthetic mineral aggregatesRepresents the mineral aggregate content, a represents the cement content, k represents the mass percentage of water added after the cement is completely hydrated, γcDenotes the density of the cement, gammawIndicating the density of the water.
As a further implementation manner, the cement content estimation formula is as follows:
Figure BDA0002610466670000032
wherein, VV0Denotes the initial porosity, γ, of the as-formed test piecegThe maximum dry density of the unblended graded mineral aggregate is shown, w/c is the water-cement ratio, and alpha is the hydration coefficient.
As a further implementation mode, adding water into the cement, uniformly stirring, and then drying in an oven; the percentage of the difference between the drying quality and the initial quality in the initial quality is the k value.
As a further implementation, the density parameters include apparent density, bulk density, maximum dry density of graded mineral aggregate, density of cement, density of water of each grade of aggregate.
As a further implementation, after obtaining the estimated value of the cement content, it is converted into the cement dosage c in the conventional sense (or referred to as estimated cement dosage).
As a further implementation mode, a plurality of cement dosage values are taken by taking the pre-estimated dosage as the center to perform a performance test, and the optimal cement dosage is obtained after comparison and confirmation.
In a second aspect, an embodiment of the present invention further provides a cement dosage estimation system for a framework compact cement stabilized macadam, including:
the density parameter acquisition module is used for designing a skeleton compact grading curve and acquiring density parameters;
the estimation formula establishing module is used for establishing a cement content estimation formula;
the cement content predictive value obtaining module is used for obtaining a predictive value of the cement content according to the density parameter and a cement content predictive formula;
and the optimal cement dosage obtaining module is used for determining the cement dosage for the test by taking the estimated value as a reference, and obtaining the optimal cement dosage through the confirmation of the performance test.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the method for estimating cement dosage of the framework compact cement-stabilized macadam when executing the program.
In a fourth aspect, the embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for estimating cement dosage for framework compact cement-stabilized macadam.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
(1) according to one or more embodiments of the invention, a cement content estimation formula is established, a cement dosage estimation value can be quickly obtained through conversion, the estimated cement dosage is taken as a reference, the cement dosage suitable for testing is selected in a certain range, and the optimal cement dosage can be obtained after certain test comparison is carried out, so that the blind trial test times are greatly reduced;
(2) according to one or more embodiments of the invention, the cement dosage is estimated through a cement dosage estimation formula, so that a relatively accurate estimation value can be obtained.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow diagram in accordance with one or more embodiments of the invention;
FIG. 2 is a schematic illustration of the change in volume of a cement during hydration according to one or more embodiments of the present invention;
FIG. 3 is a schematic illustration of the volumetric composition of cement stabilized macadam according to one or more embodiments of the invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
the first embodiment is as follows:
the embodiment provides a cement dosage estimation method for skeleton compact type cement stabilized macadam, which comprises the following steps:
designing a skeleton compact grading curve, obtaining mineral aggregate grading with smaller mineral aggregate clearance rate, and obtaining density parameters;
establishing a cement content estimation formula;
obtaining a predicted value of the cement content according to the density parameter and a cement content prediction formula;
the cement dosage for the test is determined based on the estimated value, and the optimal cement dosage is obtained through the confirmation of the performance test.
Specifically, the method for establishing the cement content estimation formula comprises the following steps:
step 1: the volume change of cement during hydration can be represented by figure 2 by analyzing the physicochemical changes during cement hydration. Wherein alpha is a hydration degree coefficient which is the ratio of the mass of the hydrated cement to the initial total mass of the cement.
During the hydration reaction, the cement clinker reacts to produce hydrated gel products, which have gel pores in the interior and capillary pores on the surface. At a low cement-to-water ratio, the cement is not completely hydrated, and only gel pores and no capillary pores are generated. As the water-cement ratio increases, the gel pore volume will increase first and then tend to a constant value. When the lowest water-cement ratio of cement hydration is reached, the cement is completely hydrated and has no capillary holes, and the gel holes also reach the maximum value. And when the water-cement ratio is continuously increased, capillary pores appear, and the pore volume of the gel cannot be continuously increased. The volume ratio of the solid phase of the hydrated gel increases until the hydration is nearly complete.
In the Powers theory for studying volume change during cement hydration, the following calculation formula is given for the volume of gel pores and capillary pores:
pore volume V of cement gel per gramg(cm3/g)：
Vg＝0.18α (1)
Volume V of capillary pores of cement per gramcp(cm3/g)：
Vcp＝w/c-0.36α (2)
In the formula: alpha is a hydration degree coefficient which is the ratio of the mass of the hydrated cement to the initial total mass of the cement; and w/c is the water-cement ratio which is the mass ratio of water to cement clinker. Both of the above formulas are the volume of gel pores or capillary pores generated by the cement per unit mass.
Step 2: the volume composition of the cement-stabilized macadam is shown in figure 3, in the cement unhydrated stage in the cement-stabilized macadam, the gaps between aggregates are filled with cement and water, and if the mixture is uniformly mixed, water and cement can enter the open gaps on the surfaces of the aggregates.
As the hydration reaction proceeds, the cement is converted into hydrated gel, the hydrated gel has two types of pores, namely gel pores and capillary pores, and the solid phase volume of the hydrated gel continuously increases along with the progress of the hydration reaction, and the volume of the hydrated gel is larger than that of the initial cement. Assuming that the hydration reaction can be completely carried out, the cement is completely converted into hydrated gel, and the gaps among the aggregates are provided with gel pores and capillary pores except the gaps which are not filled in the initial stage.
The void ratio VV after hydration should be the initial void ratio VV0And porosity by hydration VV1And, mineral aggregate void fraction VMA of cement stabilized macadamc(Note, VMAcVolume except the apparent volume of the aggregate to the total volume of the test piece) is the initial void ratio VV0Hydration porosity VV1Volume V of hydrated cementu1The sum of the three. Mineral aggregate void ratio VMA at initial statecFrom the initial void fraction VV0Volume of free water Vw0Volume V of cementu0Sum (assuming no major change in aggregate shape, volume).
And step 3: establishing a calculation formula of the void ratio VV:
the porosity of the cement stabilized macadam can change along with hydration reaction, and the porosity is changed from initial porosity VV0And hydration to produce a void volume VV1And (4) forming.
Figure BDA0002610466670000071
VV can be deduced by combining with T.C.powers formula1The calculation formula is as follows:
Figure BDA0002610466670000072
in the formula: VV0The porosity of the just-formed test piece; VV1The porosity of the cement stabilized macadam is increased after curing and hydration; gamma rayfThe maximum dry density of the cement stabilized macadam, g/cm 3; gamma ray0Is the theoretical maximum density of cement stabilized macadam, g/cm 3; alpha is a hydration degree coefficient, which refers to the ratio of the mass of the hydrated cement to the mass of the initial cement, and the value range is 0-1; a is the cement contentPercent is the percentage of the mass of the cement in the total mixture mass, which is different from the traditional cement dosage c (or called estimated cement dosage), the cement dosage c is the percentage of the mass of the cement in the mass of the aggregate, and the conversion formula of the cement dosage c and the aggregate is
Figure BDA0002610466670000081
VgAnd VcpThe pore volume of the gel pores and capillaries produced for a unit mass of cement, cm3/g, converted to volume fraction (%) of the total volume of the mix, is multiplied by
Figure BDA0002610466670000082
And 4, step 4: theoretical maximum density gamma of cement stabilized macadam0Calculating the formula:
because the actual measurement of the apparent density of the cement hydrate in the cement stabilized macadam is difficult, the quality of the cement stabilized macadam can be regarded as the sum of aggregate, cement and the water absorbed by hydration of the cement in consideration of simplified treatment, and the water absorption quality is the increased quality of the hydrate compared with the initial cement clinker. According to the mass relationship of the three components, the theoretical maximum density gamma of the cement stabilized macadam is established as follows0The calculation formula of (2):
Figure BDA0002610466670000083
in the formula: gamma raysaApparent density of the synthetic mineral material, g/cm3；PsIs the content of mineral aggregate,%; a is cement content,%; k is the mass percentage of water added after the cement is completely hydrated, the test method is that the cement is added with water and uniformly stirred, and then the cement is dried in a drying oven at 105 ℃, the difference value of the drying mass and the initial mass accounts for the percentage of the initial mass, namely the k value, which is usually about 0.2; gamma rayc、γwRespectively the density of the cement and the density of the water, g/cm3。
The quality of the mixture is composed of the aggregate quality, the cement quality and the quality of the water added after the cement is hydrated, namely Ps+a+ka＝1。
And 5: maximum dry density gamma of cement stabilized macadamfThe pre-estimation formula is as follows:
Figure BDA0002610466670000084
in the formula, gammagThe maximum dry density of the unblended graded mineral aggregate is g/cm3(ii) a k is the mass percentage of the water added after the cement is completely hydrated; a is cement content,%.
Equation (6) can also be used to back-calculate the maximum dry density of the graded mineral aggregate without cement given the maximum dry density of the cement stabilized macadam.
Step 6: the cement content a calculation formula is as follows:
by substituting formula (4) for formula (3)
Figure BDA0002610466670000091
The formula (7) can be substituted with the formulae (5) and (6):
Figure BDA0002610466670000092
the formula (8) is transformed to obtain a calculation formula of the cement content a:
Figure BDA0002610466670000093
in the formula, the apparent density gamma of the synthetic mineral aggregatesaCement density gammacAll can be obtained through tests, and the density gamma of waterwTaking 1.000g/cm3，γgThe method is obtained by a compaction test of graded mineral aggregates. The water-cement ratio w/c is more than 0.5 in the engineering, and the hydration degree coefficient alpha is 1.0. Selecting an appropriate VV0The value can be estimated to be suitable for the cement content of the current gradation, the selected VV0The larger the value, the lower the calculated cement content value.
Before the dosage of cement is estimated, the skeleton compaction without cement addition needs to be carried outCompaction test of type graded mineral aggregates to obtain maximum dry density gamma of the graded mineral aggregatesgSimultaneously calculating the mineral aggregate clearance rate VMA of the graded mineral aggregateAThe following were used:
Figure BDA0002610466670000094
VMA hereinAAnd the aforementioned cement stabilized macadam mineral aggregate void ratio VMACDifferent meanings, typically VMACIs difficult to determine computationally, so VMA is usedAValues characterize the mineral aggregate void fraction of the skeletal dense grading. Considering that cement and water can fully enter the open pore part of the aggregate surface, the calculation adopts the aggregate synthetic apparent density rather than synthetic bulk density.
Through literature research and indoor test verification, when the strength of the mixture with compact skeleton grading reaches about 5MPa, the PO32.5 cement is used for stabilizing the VV of the macadam by using the cement0About VMAAValue of 75% to 80%, and using VV of PO42.5 cement0Then is VMAAThe value is 80-85%.
Further, based on the above cement dosage estimation formula, the estimation of the cement dosage can be realized by the following processes, as shown in fig. 1:
(1) through the established grading design method, a skeleton compact grading curve is designed according to some criteria, and the proportion of each grade of aggregate is obtained according to the skeleton compact grading curve.
(2) Density parameters to be obtained: carrying out a screening density test on each grade of aggregate to obtain the apparent relative density and the gross volume relative density of the aggregate, and further calculating to obtain the apparent density and the gross volume density; obtaining the density of cement and water through experiments or experience; the compaction test is carried out on the skeleton compact type graded mineral aggregate without adding cement to obtain the maximum dry density of the graded mineral aggregate, and the process can also be used for comparing the skeleton compactness difference of different grades.
(3) Selecting an initial VV within a recommended range0Substituting the obtained density parameters and clearance rate parameters into a pre-estimation formula to obtain a pre-estimated value of the cement content a, and converting the pre-estimated value into a valueCement dosage in the conventional sense c.
(4) Because a certain error occurs in practice, the theoretically calculated gap rate parameter may be too large or too small, which results in a too high or too low estimated value. Therefore, the estimated cement dosage is taken as a reference, the cement dosage suitable for the test is selected in a certain range (three dosage values are recommended by taking the estimated dosage as a center, and 0.5 percent integral multiple of the estimated dosage is recommended to carry out amplitude variation), and the optimal cement dosage can be obtained after certain test comparison and confirmation.
Example two:
this example illustrates cement stabilized macadam with a nominal maximum particle size of 26.5 and PO42.5 cement as an example:
step 1, drawing a grading curve:
obtaining a skeleton compact grading curve according to a screening density test result of the aggregate by an established skeleton compact grading design method, wherein the skeleton compact grading has a smaller mineral aggregate clearance rate and is the premise of designing low-dose cement stabilized macadam; the passing rate and grading curve of each sieve pore are shown in table 1.
TABLE 1 Screen mesh passage rate of dense grading of framework
Figure BDA0002610466670000111
Step 2, obtaining various density parameters:
carrying out screening density test on each grade of aggregate to obtain the apparent relative density and the gross volume relative density of the aggregate, and further calculating to obtain the synthetic apparent density and the synthetic gross volume density of the graded aggregate; obtaining the density of the cement through a test; and carrying out compaction test on the skeleton compact type graded mineral aggregate without adding cement to obtain the maximum dry density of the graded mineral aggregate. The density parameters are summarized in Table 2.
TABLE 2 summary of Density parameters
Figure BDA0002610466670000112
According to the data in Table 2Calculating the mineral aggregate void ratio VMA of the graded mineral aggregate by using the formula (10)A＝15.14％。
And 3, substituting the estimation formula to calculate the cement content a:
and (3) calculating an estimated value of the framework compact type graded cement content a by adopting the formula (9). Wherein, γsb、γg、γc、γwThe density parameter values are according to table 2; the water-cement ratio is more than 0.5 in the aspect of project selection; the hydration degree coefficient alpha is 1.0, namely the condition of complete hydration of cement is considered; mineral aggregate clearance rate VMA of skeleton compact type graded mineral aggregateAThe value is 15.14%, the initial void fraction VV is selected0As mineral material void ratio VMAA80% of (i.e. VV)0The content was 12.10%. From the above parameters, the cement content a estimated from the gradation using the formula (9) was 3.3%, and the cement dose c was about 3.4% in terms of conversion.
Step 4, test comparison and screening of optimal cement dosage
The estimated dosage of 3.4 percent is taken as a reference, the approximate 3.5 percent is taken as a center, the tested cement dosages of 2.5 percent, 3.5 percent and 4.5 percent are selected, and the optimal cement dosage can be obtained after compaction tests, unconfined compressive strength tests and compression rebound modulus tests are compared. The results of the experimental comparison are shown in table 3.
TABLE 3 comparison of Cement stabilized macadam Performance at different dosages
Figure BDA0002610466670000121
According to the table 3, the maximum dry density of the cement stabilized macadam is greater than the maximum dry density of the graded mineral aggregate, and the strength performance of the cement stabilized macadam with three cement doses can meet the requirement that the strength standard is 5MPa or even more, wherein the lowest dose is 2.5%. A lower cement dose has a positive effect on reducing the transverse fractures and the reflection fractures it causes, so a dose of 2.5% can be chosen theoretically; however, considering segregation factors of coarse and fine aggregates in actual engineering, too small cement dosage reduces the integral effect of compensating for cement stabilized macadam caused by segregation, so that 3.5% of cement dosage is recommended, namely, the estimated value is approximately 3.4%.
Example three:
the embodiment also provides a cement dosage estimation system of the compact cement stabilized macadam of skeleton, including:
the density parameter acquisition module is used for designing a skeleton compact grading curve and acquiring density parameters;
the estimation formula establishing module is used for establishing a cement content estimation formula;
the cement content predictive value obtaining module is used for obtaining a predictive value of the cement content according to the density parameter and a cement content predictive formula;
and the optimal cement dosage obtaining module is used for determining the cement dosage for the test by taking the estimated value as a reference, and obtaining the optimal cement dosage through the confirmation of the performance test.
Example four:
the embodiment also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program of the first embodiment to implement the method for estimating the cement dosage of the compacted cement-stabilized macadam.
Example five:
the present embodiment also provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for estimating cement dosage of framework compact cement stabilized macadam according to the first embodiment.
The steps involved in the third to fifth embodiments correspond to the first embodiment of the method, and the detailed description thereof can be found in the relevant description of the first embodiment. The term "computer-readable storage medium" should be taken to include a single medium or multiple media containing one or more sets of instructions; it should also be understood to include any medium that is capable of storing, encoding or carrying a set of instructions for execution by a processor and that cause the processor to perform any of the methods of the present invention.
Those skilled in the art will appreciate that the modules or steps of the present invention described above can be implemented using general purpose computer means, or alternatively, they can be implemented using program code that is executable by computing means, such that they are stored in memory means for execution by the computing means, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps of them are fabricated into a single integrated circuit module. The present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A cement dosage estimation method for skeleton compact type cement stabilized macadam is characterized by comprising the following steps:
designing a skeleton compact grading curve and acquiring density parameters;
establishing a cement content estimation formula;
obtaining a predicted value of the cement content according to the density parameter and a cement content prediction formula;
the cement dosage for the test is determined based on the estimated value, and the optimal cement dosage is obtained through the confirmation of the performance test.
2. The method for estimating the cement dosage of the framework compact cement stabilized macadam according to claim 1, wherein the estimation formula of the cement content is established by:
and establishing a clearance rate calculation formula, and carrying out derivation operation to obtain a cement content estimation formula.
3. The method for estimating the cement dosage of the skeleton compact type cement stabilized macadam according to claim 2, characterized in that the theoretical maximum density of the cement stabilized macadam is established by considering the quality of the cement stabilized macadam as the sum of aggregate, cement and moisture absorbed by hydration of the cementDegree gamma0The formula:
Figure FDA0002610466660000011
wherein, γsaRepresenting the apparent density, P, of the synthetic mineral aggregatesRepresents the mineral aggregate content, a represents the cement content, k represents the mass percentage of water added after the cement is completely hydrated, γcDenotes the density of the cement, gammawIndicating the density of the water.
4. The method for estimating the cement dosage of the framework compact cement stabilized macadam according to claim 3, wherein the estimation formula of the cement content is as follows:
Figure FDA0002610466660000021
wherein, VV0Denotes the initial porosity, γ, of the as-formed test piecegThe maximum dry density of the unblended graded mineral aggregate is shown, w/c is the water-cement ratio, and alpha is the hydration coefficient.
5. The method of claim 1, wherein the density parameters include apparent density, bulk density, maximum dry density of graded mineral aggregate, cement density, and water density of each grade of aggregate.
6. The method of claim 1, wherein the predicted value of cement content is converted to a cement dosage c in a conventional sense.
7. The method of claim 1, wherein the predicted cement dosage is used as a center to obtain a plurality of cement dosage values for performance tests, and the optimal cement dosage is obtained by comparison.
8. A cement dosage estimation system for dense type cement stabilized macadam of a framework is characterized by comprising:
the density parameter acquisition module is used for designing a skeleton compact grading curve and acquiring density parameters;
the estimation formula establishing module is used for establishing a cement content estimation formula;
the cement content predictive value obtaining module is used for obtaining a predictive value of the cement content according to the density parameter and a cement content predictive formula;
and the optimal cement dosage obtaining module is used for determining the cement dosage for the test by taking the estimated value as a reference, and obtaining the optimal cement dosage through the confirmation of the performance test.
9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the method for estimating cement dosage for a compacted cement stabilized macadam according to any one of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, which program, when executed by a processor, implements a method for estimating cement dosage for a matrix compact cement stabilized macadam according to any one of claims 1-7.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113936751A (en) * 2021-08-27 2022-01-14 山东大学 Skeleton compact type cement stabilized macadam grading design method

Citations (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383864A (en) * 1980-02-21 1983-05-17 Riguez Associates Adaptive mix proportioning method for use in asphaltic concrete mixing plants
CN101746995A (en) * 2008-12-17 2010-06-23 交通部公路科学研究院 Bituminous mixture proportion design method based on tightest state
US20140052376A1 (en) * 2012-08-15 2014-02-20 Pingjun Guo Method for Cement Evaluation with Acoustic and Nuclear Density Logs
CN104318129A (en) * 2014-11-20 2015-01-28 浪潮电子信息产业股份有限公司 Method for estimating server product service life
CN104535458A (en) * 2015-01-09 2015-04-22 东南大学 Determination method for bulk density and clearance rate of coarse aggregates
CN104732113A (en) * 2015-04-21 2015-06-24 武汉科力源电气工程技术有限公司 Harmonic source injection based method of estimating installed capacity of parallel APF (active power filter)
JP5758468B2 (en) * 2013-10-23 2015-08-05 日本車輌製造株式会社 Concrete filling failure prevention method
CN104926219A (en) * 2015-06-16 2015-09-23 深圳大学 Green concrete mix proportion optimization method
CN104961366A (en) * 2015-06-12 2015-10-07 山东大学 Designing method for dense grading of asphalt mixture framework
CN105040543A (en) * 2015-06-12 2015-11-11 山东大学 Estimation method for sequence of voids in mineral aggregate of asphalt mixture
CN105224727A (en) * 2015-09-11 2016-01-06 郑州大学 A kind of autodensing concrete almixture mixing proportion design method
CN105236830A (en) * 2015-09-29 2016-01-13 长安大学 Drainage asphalt mixture mix-ratio designing method based on volumetric parameters
CN105888673A (en) * 2016-05-09 2016-08-24 山东大学 Deep-hole plastic pipe high-pressure grouting anti-explosion device in soft water-rich surrounding rock and operation method
CN105974100A (en) * 2016-06-03 2016-09-28 北京建筑大学 Method for determining optimum water content and maximum dry density of cement-stabilized macadam
CN106257466A (en) * 2016-06-12 2016-12-28 北京建筑大学 A kind of determination method of compound compaction test predetermined moisture content
CN106294973A (en) * 2016-08-05 2017-01-04 长安大学 A kind of mixing proportion design method of celluar concrete
CN106447541A (en) * 2016-09-27 2017-02-22 中石化石油工程技术服务有限公司 Theoretical calculation method for water content of mixed material of cement stabilized macadam road pavement
CN106544944A (en) * 2016-10-13 2017-03-29 长安大学 A kind of small particle framework compact type asphalt mixture grading method
CN107129196A (en) * 2017-06-20 2017-09-05 广西桂海高速公路有限公司 A kind of coarse grain formula stress absorption structure layer asphalt and its design method
CN108280310A (en) * 2018-02-06 2018-07-13 嘉兴市嘉海建设有限公司 Asphalt mixture gradation design method based on grading embedded squeezing and void in mineral aggregate
CN108797271A (en) * 2018-05-31 2018-11-13 安徽省交通规划设计研究总院股份有限公司 A kind of production method of high building garbage aggregate volume reclaimed asphalt mixture
CN109279818A (en) * 2018-11-23 2019-01-29 佛山科学技术学院 A method of index Design framework compact type asphalt mixture is seen based on thin
CN109503074A (en) * 2018-12-07 2019-03-22 安徽省交通规划设计研究总院股份有限公司 A kind of self-leveling concrete for mixing CHARACTERISTICS OF TAILINGS SAND
CN110412254A (en) * 2019-08-12 2019-11-05 浙江省交通运输科学研究院 A kind of half-flexible pavement estimates the test method of residual air voids
CN111233413A (en) * 2020-01-15 2020-06-05 安徽工业大学 High-expansion-energy steel slag concrete and preparation method thereof

Patent Citations (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383864A (en) * 1980-02-21 1983-05-17 Riguez Associates Adaptive mix proportioning method for use in asphaltic concrete mixing plants
CN101746995A (en) * 2008-12-17 2010-06-23 交通部公路科学研究院 Bituminous mixture proportion design method based on tightest state
US20140052376A1 (en) * 2012-08-15 2014-02-20 Pingjun Guo Method for Cement Evaluation with Acoustic and Nuclear Density Logs
JP5758468B2 (en) * 2013-10-23 2015-08-05 日本車輌製造株式会社 Concrete filling failure prevention method
CN104318129A (en) * 2014-11-20 2015-01-28 浪潮电子信息产业股份有限公司 Method for estimating server product service life
CN104535458A (en) * 2015-01-09 2015-04-22 东南大学 Determination method for bulk density and clearance rate of coarse aggregates
CN104732113A (en) * 2015-04-21 2015-06-24 武汉科力源电气工程技术有限公司 Harmonic source injection based method of estimating installed capacity of parallel APF (active power filter)
CN104961366A (en) * 2015-06-12 2015-10-07 山东大学 Designing method for dense grading of asphalt mixture framework
CN105040543A (en) * 2015-06-12 2015-11-11 山东大学 Estimation method for sequence of voids in mineral aggregate of asphalt mixture
CN104926219A (en) * 2015-06-16 2015-09-23 深圳大学 Green concrete mix proportion optimization method
CN105224727A (en) * 2015-09-11 2016-01-06 郑州大学 A kind of autodensing concrete almixture mixing proportion design method
CN105236830A (en) * 2015-09-29 2016-01-13 长安大学 Drainage asphalt mixture mix-ratio designing method based on volumetric parameters
CN105888673A (en) * 2016-05-09 2016-08-24 山东大学 Deep-hole plastic pipe high-pressure grouting anti-explosion device in soft water-rich surrounding rock and operation method
CN105974100A (en) * 2016-06-03 2016-09-28 北京建筑大学 Method for determining optimum water content and maximum dry density of cement-stabilized macadam
CN106257466A (en) * 2016-06-12 2016-12-28 北京建筑大学 A kind of determination method of compound compaction test predetermined moisture content
CN106294973A (en) * 2016-08-05 2017-01-04 长安大学 A kind of mixing proportion design method of celluar concrete
CN106447541A (en) * 2016-09-27 2017-02-22 中石化石油工程技术服务有限公司 Theoretical calculation method for water content of mixed material of cement stabilized macadam road pavement
CN106544944A (en) * 2016-10-13 2017-03-29 长安大学 A kind of small particle framework compact type asphalt mixture grading method
CN107129196A (en) * 2017-06-20 2017-09-05 广西桂海高速公路有限公司 A kind of coarse grain formula stress absorption structure layer asphalt and its design method
CN108280310A (en) * 2018-02-06 2018-07-13 嘉兴市嘉海建设有限公司 Asphalt mixture gradation design method based on grading embedded squeezing and void in mineral aggregate
CN108797271A (en) * 2018-05-31 2018-11-13 安徽省交通规划设计研究总院股份有限公司 A kind of production method of high building garbage aggregate volume reclaimed asphalt mixture
CN109279818A (en) * 2018-11-23 2019-01-29 佛山科学技术学院 A method of index Design framework compact type asphalt mixture is seen based on thin
CN109503074A (en) * 2018-12-07 2019-03-22 安徽省交通规划设计研究总院股份有限公司 A kind of self-leveling concrete for mixing CHARACTERISTICS OF TAILINGS SAND
CN110412254A (en) * 2019-08-12 2019-11-05 浙江省交通运输科学研究院 A kind of half-flexible pavement estimates the test method of residual air voids
CN111233413A (en) * 2020-01-15 2020-06-05 安徽工业大学 High-expansion-energy steel slag concrete and preparation method thereof

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
HU LI QUN 等: "Research on Performance of Cement Stabilized Skeleton-Dense Structure Aggregate Base Course Material", 《ADVANCED MATERIALS RESEARCH》 *
YU MIAO 等: "Experimental research on cementitious material made with heat treated steel slag tailings", 《2011 INTERNATIONAL CONFERENCE ON ELECTRIC TECHNOLOGY AND CIVIL ENGINEERING》 *
刘树堂 等: "沥青混合料目标配合比设计的最佳沥青含量范围估算", 《公路交通科技》 *
张嘎吱: "水泥粉煤灰稳定碎石基层配合比设计和路用性能研究", 《中国优秀博硕士学位论文全文数据库(博士) 工程科技Ⅱ辑》 *
王峰 等: "骨架密实型水泥稳定碎石集料级配设计方法综述", 《建材技术与应用》 *
许文: "水泥乳化沥青混合料强度机理、改进方法及路用性能研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113936751A (en) * 2021-08-27 2022-01-14 山东大学 Skeleton compact type cement stabilized macadam grading design method

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