CN106447541A - Theoretical calculation method for water content of mixed material of cement stabilized macadam road pavement - Google Patents
Theoretical calculation method for water content of mixed material of cement stabilized macadam road pavement Download PDFInfo
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- CN106447541A CN106447541A CN201610856002.XA CN201610856002A CN106447541A CN 106447541 A CN106447541 A CN 106447541A CN 201610856002 A CN201610856002 A CN 201610856002A CN 106447541 A CN106447541 A CN 106447541A
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Abstract
The invention discloses a theoretical calculation method for the water content of a mixed material of a cement stabilized macadam road pavement, and aims to determine an optimal water content of the mixed material of the cement stabilized macadam road pavement, and the optimal water content of the mixed material can be relatively precisely and reasonably determined with comparison with an indoor testing result. The theoretical calculation method comprises the following steps: performing theoretical calculation on the standard water rate of cement in a test part used in an indoor test, the water absorption rate of an aggregate and the water rate of a middle gap of the mixed material, converting calculated results into the water amount of the cement in the test part, the water absorption amount of the aggregate and the water amount of the middle gap of the mixed material so as to determine an actual optimal water amount of the mixed material, and further converting the optimal water amount of the mixed material into the optimal water content of the mixed material. By adopting the theoretical calculation method, the situation that the optimal water content of the mixed material can be only determined by using an indoor testing method can be changed, the proportioning rate of the water content of the mixed material of the cement stabilized macadam road pavement can be relatively and reasonably designed, the construction quality can be improved, rework can be avoided, and the production cost can be lowered.
Description
Technical field
The present invention relates in highway structure compound moisture content computational methods, particularly cement stabilized macadam highway pavement
The theoretical calculation method of compound moisture content, for the determination of cement stabilized macadam highway pavement compound optimum moisture content, energy
Enough compare with laboratory test results, make cement stabilized macadam highway pavement compound optimum moisture content determination is more accurate and conjunction
Reason.
Background technology
Domestic current at present《Highway road surface construction technique normalizing》（JTJ034-2000）Regulation：Mixture Ratio
Design moisture content must pass through test method and determines.But difference can be produced during test operation indoors, lead to test number
According to there is certain deviation.If result of the test is applied to reality, its fluctuation deviation is just bigger.During practice of construction,
If optimum moisture content is low, easily loose, pavement strength reduction in the road crust of molding.If design is most preferably aqueous
Rate is higher, and the pavement strength of molding is too high, pavement crack easily, and water easily causes road surface local failure once entering road surface.Always
It, the deviation in mix proportion design moisture content is larger,Easily cause road quality to decline, be to use in the highway later stage to bury matter
Amount hidden danger.And there is presently no the method that other can evaluate laboratory test, production scene needs a kind of auxiliary computational methods, with
Laboratory test evaluates the design of cement stabilized macadam highway pavement compound moisture content jointly.
Content of the invention
It is an object of the invention to provide the theoretical calculation method of cement stabilized macadam highway pavement compound moisture content, can
The correctness of the Mixture Ratio moisture content of auxiliary checking laboratory test design, improves laboratory test mixing in current design criteria
The degree of accuracy of material match ratio moisture content, improves the quality of cement stabilized macadam highway pavement.
The technical solution of the present invention is：The theoretical calculation method of cement stabilized macadam highway pavement compound moisture content, be
Utility rate of water in cement standard utility rate of water in the test specimen that laboratory test is used, aggregate water absorption and compound intermediate gap enters
Row Theoretical Calculation, and be converted into cement water consumption in test specimen, gather materials in water absorption and compound according to the result calculating above
Water consumption in gap is determining the optimum moisture content of actual compound, then the optimum moisture content of compound is converted into compound
Optimum moisture content.
The remarkable result of the present invention is：The present invention is to calculate the standard water of wherein cement respectively according to the weight of test specimen
Required water amount sum in amount, the water absorption and compound intermediate gap gathered materials is determining the optimum moisture content of compound and optimal
Moisture content, can solve problems with this theory:
1st, solve the present situation individually determining compound moisture content at present according to test, after avoiding the occurrence of deviation, find reason again
Defect, prevents from delaying the engineering time.
2nd, the optimum moisture content of cement stabilized macadam class highway pavement cement stabilizing class formation can effectively be determined, can be fast
Speed cooperation laboratory test accurately determines, is a kind of effective method.
3rd, this method is by needed in gap between the standard water consumption of cement and the water absorption gathered materials and compound
Three's sum of water consumption, as the design basis of optimum moisture content and optimum moisture content, is to pass through to calculate according to current specifications
The data going out, computational methods are reasonable, practical.
4th, laboratory test can be assisted using the present invention, jointly complete the calculating of mix proportion design moisture content, make
The selection of its moisture content is more reasonable.
The present invention has stronger theoretical property, changes and is only capable of at present relying on Experimental Method in Laboratory to determine that compound is optimal
The way of moisture content, simple and easy to do, it is that one kind is simple, compound optimum moisture content can be calculated in advance and check simultaneously
The method of laboratory test.The present invention can make the mix-design more adduction of cement stabilized macadam highway pavement compound moisture content
Reason, is a kind of beneficial complement to existing laboratory test.The quality of cement stabilized macadam highway pavement can be improved, it is to avoid return
Work, shortens the construction period, reduces production cost, has significant economic benefit and social benefit.
Specific embodiment
With reference to embodiments in detail the present invention is described in detail, not limits the scope of the invention, the design of all use present invention
The improvement that thinking draws belongs to the protection category of the present invention.
The theoretical calculation method of cement stabilized macadam highway pavement compound moisture content, is the test specimen that laboratory test is used
In cement standard utility rate of water, the utility rate of water in aggregate water absorption and compound intermediate gap carry out Theoretical Calculation, and according to
On the water consumption that is converted in cement water consumption in test specimen, water absorption of gathering materials and compound intermediate gap of the result that calculates determining
The optimum moisture content of actual compound, then the optimum moisture content of compound is converted into the optimum moisture content of compound.
The mensure of cement standard utility rate of water is according to " highway engineering cement and cement concrete testing regulationss JTGE30-
The method of T0505-2005 in 2005 " is carried out, and determines the normal consistency of cement with this：
1st, modulate cement paste sample, must accomplish before test：
(1) the metal bar of Vicat apparatus can be slidably.
(2) when adjusting the bar of Vicat apparatus to contact glass plate upper surface, by height pointer zero adjustment.
(3) agitator for cement mortar normal operation.
2nd, cement paste mixing
Stirred with agitator for cement mortar, agitated kettle and stirring vane are first nuzzled up with wet cloth, mixing water are poured in agitated kettle, so
Carefully the 500g weighing up cement is added to the water in 5s-10 s afterwards, prevents water and cement from spilling;When mixing and stirring, first agitated kettle is pacified
It is attached on the pot seat of blender, then agitated kettle is risen to blender stirring vane bottom, start blender.Stirring at low speed 120s,
Stop 15s, the cement mortar on stirring vane and agitated kettle pot wall is scraped in the middle of pot simultaneously, then high-speed stirred 120 s shuts down.
3rd, the determination step of cement standard utility rate of water
(1), after mix terminates, immediately cement paste good for mixing is loaded in the die trial put on a glass, inserted with pocket knife
Smash, gently vibrate for several times, scrape off unnecessary net slurry.
(2) rapidly die trial and glass plate are moved on on Vicat apparatus, and the center of die trial is aligned in Vicat apparatus after putting down
On bar, reduce bar until contacting with cement paste surface, after tightening screw 1s-2 s, loosen suddenly, make bar vertical certainly
Sunk in cement paste by ground.When bar stops sinking to or discharging bar 30s, record bar, to the distance of glass plate, rises examination
After bar, clean immediately.
(3) whole operation should complete in 1.5min after agitation.Net slurry is sunk to and away from glass plate 6mm ± 1mm's with bar
Cement paste is starched only for normal consistency, and its batched water is the consumptive use of water normal consistence of this cement.
(4) when bar is less than 5mm away from glass plate, should suitable diminishing, the mixing of repetition cement mortar and said process;If
When distance is more than 7mm, then should suitably add water, the mixing of rehydration of laying equal stress on mud and said process.
The calculating of the utility rate of water in compound intermediate gap includes：
In A, highway pavement cement stabilized macadam, the related initial data of constituent material measures
According to<<Highway road surface construction technique normalizing>>（JTJ034-2000）Method in code uses to Practical Project
Material is sampled, test coarse aggregate, the density of fine aggregate, and carries out sieve test, measures the particle diameter group that all size gathers materials
Become.
B, determine the usage ratio gathered materials of each shelves that test specimen uses
The screening result being gathered materials according to each shelves, according to<<Highway road surface construction technique normalizing>>（JTJ034-2000）Code
In method, using calculating method or diagram method, the material that method uses to Practical Project according to the rules is sampled, test rough set
Material, the density of fine aggregate, and carry out sieve test, measure the particle diameter composition that all size gathers materials.Determine the use that each specification is gathered materials
Amount ratio, tries to achieve the formate gradation composition of compound.The formate gradation composition curve of compound has to comply with the requirement of design grading limit, no
Must there is excessive interlocking.When through repeatedly adjust still have plural sieve aperture to exceed design grading limit when it is necessary to right
Raw material, that is, highway pavement Cement Treated Material be adjusted or change raw material, redesign.
C, the usage ratio gathered materials according to shelves each in test specimen, calculate the maximum relative theory density of compound in test specimen simultaneously
Estimate the residual clearance rate of actual compound；
D, with compound saturation as foundation, calculate the utility rate of water in compound intermediate gap, the span of saturation value sets
It is scheduled between 50%-70%, any number between 50%-70% can be used, such as 55%, 58%, 61%, 66% etc..The saturation number of degrees
The value of value is 60% or by laboratory test, saturation value is verified and adjust.
The optimum moisture content of compound is to calculate the standard water consumption of wherein cement respectively, gather materials according to the weight of test specimen
Water consumption in water absorption and compound intermediate gap, is compound with the above-mentioned summation calculating divided by the weight gathered materials
Optimum moisture content.The data in utility rate of water in the standard utility rate of water of cement, the water absorption rate gathering materials and compound intermediate gap is complete
Portion is converted to mass unit in grams, uses water in cement standard utility rate of water, aggregate water absorption and compound intermediate gap
Rate is the percentage ratio with the not compound gross mass of cement for the water consumption of each ingredient above-mentioned, the number obtaining after calculating
Value.Fine aggregate moisture content in gathering materials be saturation is in the clearance gap of surface of aggregate, the micro- moistening state in surface is
Calculating benchmark, the quality of the Free water moisture film that outer in clearance gap of gathering materials, surface of aggregate free-flowing water is formed is not as meter
Calculate the content of the moisture content that gathers materials.
Illustrate the specific design main points of the present invention below with design embodiments.
Design embodiments one
The present embodiment adopts geo-compaction instrument vibration moulding method to test specimen, and wherein cement stabilized macadam highway pavement compound is related
The initial data of constituent material measures numerical value,As following table one.
Table one, the actual-structure measurement table of performance of gathering materials
In upper table：The normal consistency of cement is 27.2%.
1st, calculate, according to after the design proportion mixing gathered materials, the maximum relative theory density 2.706 gathered materials；
The maximum relative theory density of compound when the 2nd, calculating cement：
100 ÷（96 ÷ 2.706+4.0 ÷ 3.1）=2.719
In formula：96 is shared ratio in compound of gathering materials；2.706 is according to the phase gathered materials after the design proportion mixing of building stones
To solid density；4.0 is the shared ratio in compound of cement；3.1 is the relative density of cement.
3rd, calculate the comprehensive water absorption rate gathering materials by upper table table one（%）
40 × 0.4 ÷ 100+35 × 0.4 ÷ 100+15 × 0.7 ÷ 100+10 × 2.2 ÷ 100
=0.625
4th, calculate the volume of test specimen under maximum theory density（Cm3）
15cm × 15cm × 15cm × 3.14 ÷ 4=2651cm3
5th, estimate the residual clearance of actual test specimen
The maximum dry density of actual test specimen is 2.35g/cm3；See table two with reference to value：
Table two maximum dry density value reference table
Residual clearance rate（%）：（1-2.35 ÷ 2.719）× 100=13.6
In formula：2.35 is the maximum dry density of actual test specimen；2.719 is the maximum relative theory density of compound during cement.
6th, estimate the percentage rate of Free water between compound：
During using geo-compaction instrument heavy compaction, saturation value adopts the upper limit 70%, using during vibrating forming machine molding, numerical value
Using lower limit 50%, the data between 50%-70% can be chosen according to the operation level of experimenter, status of equipment, chooses
Data see table three.
Table three saturation data chooses numerical tabular
13.6 ×（100-50）× 1 ÷ 100=6.8 (%)
Calculate the water consumption in compound intermediate gap：2651 × 6.8 ÷ 100=180.27（g）
7th, after detecting, cement standard utility rate of water is 27.2%
8th, estimate the weight of compound：6500（G）
9th, calculate the quality of P.O42.5 normal silicate slow setting cement：6500×0.04=260（g）
10th, calculate the water consumption of cement：260 × 0.272=70.2（g）
11st, calculate the water absorption gathered materials：6500 × 0.625 ÷ 100=40.63（G）
12nd, calculate the total water consumption needed for compound：40.6+70.2+180.3=291.1（g）
13rd, calculate the moisture content needed for compound:291.1÷（6500-291.1-260）×100=4.9(%)
Estimated data is compared as follows with indoor experimental data：
1st, laboratory test surveys the moisture content 5.1% of test specimen, and cement dose is 3.8%, and maximum dry density is 2.33g/cm3.
2nd, using the estimated data that the inventive method calculates to test specimen it is：The moisture content 4.9% of test specimen, cement dose is
4.0%, maximum dry density is 2.35g/cm3.
The model that error compliant between the above-mentioned every test specimen data estimated and the indoor experimental data of reality requires
Enclose.
Design embodiments two
The present embodiment, using the test specimen of material identical with embodiment one, using geotechnological instrument heavy compaction method, designs compound aqueous
Rate.
In the design embodiment, the initial data of cement stabilized macadam highway pavement compound correlation constituent material measures number
Value,As upper table one：
1st, calculate, according to after the design proportion mixing gathered materials, the maximum relative theory density 2.706 gathered materials；
The maximum relative theory density of compound when the 2nd, calculating cement：
100 ÷（96 ÷ 2.706+4.0 ÷ 3.1）=2.719
In formula：96 is shared ratio in compound of gathering materials；2.706 is according to the phase gathered materials after the design proportion mixing of building stones
To solid density；4.0 is the shared ratio in compound of cement；3.1 is the relative density of cement.
3rd, calculate the comprehensive water absorption rate gathering materials by upper table table one（%）
40 × 0.4 ÷ 100+35 × 0.4 ÷ 100+15 × 0.7 ÷ 100+10 × 2.2 ÷ 100
=0.625
4th, calculate the volume of test specimen under maximum theory density（Cm3）
15cm × 15cm × 15cm × 3.14 ÷ 4=2651cm3
5th, estimate the residual clearance of actual test specimen
Compound maximum dry density and the maximum dry density warp of vibration moulding instrument vibration moulding method that geotechnological instrument heavy compaction method is surveyed
Testing transformation ratio is：0.97：
The maximum dry density of actual test specimen is 2.35 × 0.97=2.28g/cm3；
Residual clearance rate（%）：（1-2.28 ÷ 2.719）× 100=16.1
In formula：The maximum dry density of the actual test specimen of 2.28 geotechnological instrument heavy compaction method designs；2.719 is compound during cement
Maximum relative theory density.
6th, estimate the percentage rate of Free water between compound：
The present embodiment adopts geo-compaction instrument heavy compaction method, and saturation value is chosen data and seen the above table three, the saturation of selection
Numerical parameter is 64%.
16.1 × 64 ÷ 100=10.3 (%)
Choose the surface of test piece coefficient of roughness：Geo-compaction instrument heavy compaction method：0.8-0.85；0.98- during vibrating forming machine molding
1.00；
Calculate the water consumption in compound intermediate gap：2651×0.103×0.8=218.4（g）
7th, after detecting, cement standard utility rate of water is 27.2%
8th, estimate the weight of compound：6500（G）
9th, calculate the quality of P.O42.5 normal silicate slow setting cement：6500×0.04=260（g）
10th, calculate the water consumption of cement：260 × 0.272=70.7（g）
11st, calculate the water absorption gathered materials：6500 × 0.625 ÷ 100=40.6（G）
12nd, calculate the total water consumption needed for compound：40.6+70.7+218.4=329.7（g）
13rd, calculate moisture content 329.7 ÷ needed for compound（6500-260-329.7）×100=5.6%
Estimated data is compared as follows with indoor heavy compaction method test data：
1st, laboratory test surveys the moisture content 5.4% of test specimen, and cement dose is 4.0%, and maximum dry density is 2.28g/cm3.
2nd, using the estimated data that the inventive method calculates to test specimen it is：The moisture content 5.6% of test specimen, cement dose is
4.0%, maximum dry density is 2.28g/cm3.
The every test specimen data estimated by two kinds of geo-compaction instrument forming methods in above-mentioned two embodiment with actual
The scope that error compliant between indoor experimental data requires.From above design example it can be deduced that meter with the present invention
It is feasible that calculation method estimates test specimen.
Claims (6)
1. the theoretical calculation method of cement stabilized macadam highway pavement compound moisture content, is in the test specimen that laboratory test is used
Cement standard utility rate of water, the utility rate of water in aggregate water absorption and compound intermediate gap carry out Theoretical Calculation, and according to more than
The water consumption that the result calculating is converted in cement water consumption in test specimen, water absorption of gathering materials and compound intermediate gap is determining reality
The optimum moisture content of border compound, then the optimum moisture content of compound is converted into the optimum moisture content of compound.
2. the theoretical calculation method of cement stabilized macadam highway pavement compound moisture content as claimed in claim 1, its feature
It is that the calculating of the utility rate of water in described compound intermediate gap includes：
In A, highway pavement cement stabilized macadam, the related initial data of constituent material measures；
B, determine the usage ratio gathered materials of each shelves that test specimen uses；
C, the usage ratio gathered materials according to shelves each in test specimen, calculate in test specimen the maximum relative theory density of compound and estimate
The residual clearance rate of actual compound；
D, with compound saturation as foundation, calculate the utility rate of water in compound intermediate gap, the span of saturation value sets
It is scheduled between 50%-70%.
3. the theoretical calculation method of cement stabilized macadam highway pavement compound moisture content as claimed in claim 2, its feature
It is that the value of described saturation value is 60% or by laboratory test, saturation value is verified and adjust.
4. the theoretical calculation method of cement stabilized macadam highway pavement compound moisture content as claimed in claim 1 or 2, it is special
Levying is, the optimum moisture content of compound is to calculate the standard water consumption of wherein cement, the suction gathered materials respectively according to the weight of test specimen
Water consumption in the water yield and compound intermediate gap, is compound with the above-mentioned summation calculating divided by the weight gathered materials
Optimum moisture content.
5. the theoretical calculation method of cement stabilized macadam highway pavement compound moisture content as claimed in claim 1, its feature
It is that the data in utility rate of water in the standard utility rate of water of described cement, the water absorption rate gathering materials and compound intermediate gap is all changed
For mass unit in grams, on the utility rate of water in cement standard utility rate of water, aggregate water absorption and compound intermediate gap is
State the water consumption of each ingredient and the percentage ratio of the not compound gross mass of cement, the numerical value obtaining after calculating.
6. the theoretical calculation method of cement stabilized macadam highway pavement compound moisture content as claimed in claim 5, its feature
Be, described gather materials in fine aggregate moisture content be that saturation, the micro- moistening shape in surface are in the clearance gap of surface of aggregate
State is calculating benchmark, and the quality of the Free water moisture film that outer in clearance gap of gathering materials, surface of aggregate free-flowing water is formed is not made
For calculating the content of the moisture content that gathers materials.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111831961A (en) * | 2020-07-30 | 2020-10-27 | 山东大学 | Cement dose estimation method and system for skeleton compact type cement stabilized macadam |
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| CN101653967A (en) * | 2009-09-17 | 2010-02-24 | 长安大学 | Crack resistance type cement stabilized macadam proportioning design method based on vibration test method |
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