CN106257267A - A kind of optimum moisture content using static pressure method and the determination method of maximum dry density - Google Patents
A kind of optimum moisture content using static pressure method and the determination method of maximum dry density Download PDFInfo
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- CN106257267A CN106257267A CN201610407563.1A CN201610407563A CN106257267A CN 106257267 A CN106257267 A CN 106257267A CN 201610407563 A CN201610407563 A CN 201610407563A CN 106257267 A CN106257267 A CN 106257267A
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- 238000000034 method Methods 0.000 title claims abstract description 81
- 230000003068 static effect Effects 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000007493 shaping process Methods 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims description 35
- 239000000203 mixture Substances 0.000 claims description 21
- 150000001875 compounds Chemical class 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000010721 machine oil Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 2
- KGNDCEVUMONOKF-UGPLYTSKSA-N benzyl n-[(2r)-1-[(2s,4r)-2-[[(2s)-6-amino-1-(1,3-benzoxazol-2-yl)-1,1-dihydroxyhexan-2-yl]carbamoyl]-4-[(4-methylphenyl)methoxy]pyrrolidin-1-yl]-1-oxo-4-phenylbutan-2-yl]carbamate Chemical compound C1=CC(C)=CC=C1CO[C@H]1CN(C(=O)[C@@H](CCC=2C=CC=CC=2)NC(=O)OCC=2C=CC=CC=2)[C@H](C(=O)N[C@@H](CCCCN)C(O)(O)C=2OC3=CC=CC=C3N=2)C1 KGNDCEVUMONOKF-UGPLYTSKSA-N 0.000 claims 1
- 229940125833 compound 23 Drugs 0.000 claims 1
- 238000005056 compaction Methods 0.000 abstract description 18
- 238000001035 drying Methods 0.000 abstract description 2
- 239000002689 soil Substances 0.000 description 15
- 238000003825 pressing Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 2
- 229940126214 compound 3 Drugs 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011504 laterite Substances 0.000 description 1
- 229910001710 laterite Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
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- 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
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
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- 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
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
- G01N2009/022—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of solids
- G01N2009/024—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of solids the volume being determined directly, e.g. by size of container
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention provides a kind of optimum moisture content using static pressure method and maximum dry density to determine method, applies pressure including to shaping test piece；Calculate water content ω and dry density ρ；With water content ω as transverse axis, dry density ρ is that the longitudinal axis sets up secondary relation curve, and taking dry density extreme value is maximum dry density, and taking water content corresponding to maximum dry density is optimum moisture content, and wherein, dry density and water content are calculated by formula and formula.The method that the present invention provides avoids the water content error that test specimen coring causes.Without drying, quickly it is calculated optimum moisture content and maximum dry density, saves workload, shorten the test period.And result is more or less the same with compaction test numerical value.
Description
Technical field
The invention belongs to Transportation and Civil Engineering field, be specifically related to a kind of optimum moisture content using static pressure method and maximum dry
Density determining method.
Background technology
The common method determining optimum moisture content and maximum dry density is compaction test method and vibrating compacting test method,
Method used by forming cylinder shape test specimen and beam specimen is static pressure method, hits the work of solid yardage method, vibrating compaction method and static pressure method
Different by principle.
Specification specifies that the optimum moisture content of cement stabilized macadam and the determination method of maximum dry density are compaction test method,
The influence factor of compaction test results is numerous, and compaction test workload is big.
Summary of the invention
In order to overcome above technical problem of the prior art, the present invention provides a kind of optimum moisture content using static pressure method
Determining method with maximum dry density, the method can be greatly reduced workload.It is an object of the invention to be determined by static pressure method
The optimum moisture content of cement stabilized macadam and maximum dry density.
The purpose of the present invention realizes especially by below scheme:
A kind of optimum moisture content using static pressure method and maximum dry density determine method, apply pressure including to shaping test piece
Power；Calculate water content ω and dry density ρ；With water content ω as transverse axis, dry density ρ is that the longitudinal axis sets up secondary relation curve, takes dry
Density maximum is maximum dry density, and taking water content corresponding to maximum dry density is optimum moisture content.
Preferably, the preparation of described shaping test piece comprises the following steps:
A. the test portion that predetermined moisture content w is different is prepared；Test specimen for φ 50mm × 50mm a: test specimen about needs dry ground
210g-240g；Test specimen for φ 100mm × 100mm a: test specimen about needs dry ground 2000g-2200g；For φ 150mm ×
The test specimen of 150mm a: test specimen about needs dry ground 6000g-6400g；
B. test portion is carried out shelving；
C., after shelving completes, the cement the mix that add predetermined quantity c are uniform, shaping test piece in 1h after mix completes.
Cement stabilized macadam cement consumption is generally compound 3%～6%, and therefore, predetermined quantity c is 3%～6%.
Any of the above-described scheme preferably, when implementing step A, prepares 5-8 part test portion that predetermined moisture content w is different.This
Bright optimum moisture content and maximum dry density determine method, are that dry density and water content are formed conic section, then take pole
Value, obtains optimum moisture content and maximum dry density, if test portion number is very little, then can cause obtaining extreme value；And if tried
Material number is too many, and the cycle can be caused elongated, and workload increases.
Any of the above-described scheme preferably, when implementing step A, prepares 6-7 part test portion that predetermined moisture content w is different.6-7 tries
Material number can guarantee that the acquisition of extreme value, will not increase workload simultaneously.
Any of the above-described scheme preferably, is implemented step B, during shelving, die trial inwall is smeared machine oil.
Any of the above-described scheme preferably, implements step B, during shelving, amount of water 1%-2% lower than predetermined moisture content.
Any of the above-described scheme preferably, implements step C, and during shaping test piece, die trial size used is according to design grating
Nominal maximum aggregate size selects.Fine grained soil: the diameter × height of die trial=φ 50mm × 50mm；Middle grain soil: the diameter × height of die trial=
φ100mm×100mm；Coarse-grained soil: the diameter × height of die trial=φ 150mm × 150mm；
Reserved water preferably, when implementing step C, is added during mix by any of the above-described scheme.
Any of the above-described scheme preferably, implements step C, and during shaping test piece, the supporting lower cushion block of die trial puts into die trial
Bottom, exposes 2cm, is divided by compound 2-3 time and pours into die trial, and the most slotting the most real with ramming rod after pouring into, compound should be big every time
Die trial is filled up in cause, makes the upper cushion block supporting with die trial can just put into die trial, the mixture quality m that record is inserted1.Die trial is supporting
Lower cushion block put into the bottom of die trial, exposing size can not be the least, and otherwise test specimen can be pressed completely into die trial；Expose size the most not
Can be too big, test portion otherwise can be caused not to be completely filled with.
Any of the above-described scheme preferably, when applying pressure, is pressurizeed with the loading speed of 1mm/min.The LOADING RATES of pressurization
It is difficult to excessive, test portion otherwise can be caused to crush；LOADING RATES the least can the causing again of pressurization determines that the cycle is long, loses time.
Any of the above-described scheme preferably, when applying pressure, is pressurized to 500KN, maintains 2min and above unloading.
Any of the above-described scheme preferably, when applying pressure, under the conditions of 500KN, unloads after maintaining pressure 3min.
Any of the above-described scheme preferably, when applying pressure, under the conditions of 500KN, unloads after maintaining pressure 5min.
Any of the above-described scheme preferably, when applying pressure, under the conditions of 500KN, unloads after maintaining pressure 7min.
Any of the above-described scheme preferably, when applying pressure, under the conditions of 500KN, unloads after maintaining pressure 10min.
Any of the above-described scheme preferably, when applying pressure, under the conditions of 500KN, unloads after maintaining pressure 30min.
Any of the above-described scheme preferably, when applying pressure, under the conditions of 500KN, unloads after maintaining pressure 50min.
Any of the above-described scheme preferably, when applying pressure, under the conditions of 500KN, unloads after maintaining pressure 120min.
Any of the above-described scheme preferably, after discharge degree, is sloughed die trial, is measured the height h of test specimen, calculate test specimen body
Long-pending V, weighs test specimen quality m2。
Any of the above-described scheme preferably, calculate optimum moisture content use formula:
Any of the above-described scheme preferably, calculate maximum dry density use formula:
The present invention rationale here is that: uses die trial used by forming cylinder shape test specimen to be respectively charged into the water of different moisture content
Sludge mixed material pressurizes, and measures height of specimen when being pressurized to 500KN, and then calculates test specimen volume.Gather materials with in compound
Obtain dry density with the quality sum of cement divided by test specimen volume, remove by the difference losing quality before and after batched water and specimen molding
Water content is obtained with test specimen quality.Set up transverse axis be water content, the longitudinal axis be the secondary relation curve of dry density, take dry density extreme value
For maximum dry density, taking water content corresponding to maximum dry density is optimum moisture content.
This method avoids compaction test causes mineral aggregate broken thus the problem that causes grating to change；Test specimen after reality is hit in employing
Institute aqueous calculating optimum moisture content and maximum dry density, it is to avoid the water content error that test specimen coring causes.Without drying, quickly
It is calculated optimum moisture content and maximum dry density, saves workload, shorten the test period.Use the maximum dry that this method determines
The maximum dry density that density determines slightly larger than compaction test, optimum moisture content is slightly less than the optimum moisture content that compaction test determines,
But numerical value is more or less the same, it was demonstrated that the effectiveness of this method.
Detailed description of the invention
In order to clearer, correctly understand the summary of the invention of the present invention, below in conjunction with specific embodiment to the present invention's
Summary of the invention is explained further below, illustrates.
Embodiment 1
A kind of optimum moisture content using static pressure method and maximum dry density determine method, comprise the following steps:
A. according to highway road surface construction technique normalizing JTJ034-2000, according to the nominal maximum aggregate size of design grating
Selection die trial size: fine grained soil, the diameter × height of die trial=φ 50mm × 50mm；Middle grain soil, the diameter × height=φ of die trial
100mm×100mm；Coarse-grained soil, the diameter × height of die trial=φ 150mm × 150mm；
B. method shown in T0804-1994 is used to prepare 7 parts of test portions, corresponding 7 different moisture contents.For φ 50mm ×
The test specimen of 50mm, a test specimen about needs dry ground 210g-240g；For the test specimen of φ 100mm × 100mm, a test specimen about needs to do
Soil 2000g-2200g；For the test specimen of φ 150mm × 150mm, a test specimen about needs dry ground 6000g-6400g；
C. carrying out shelving according to the method provided in T0843-2009, shelving amount of water is than the predetermined low 1%-of water content
2%, die trial inwall is smeared machine oil；
D., after shelving completes, the cement the mix that add predetermined quantity are uniform, are added by reserved water during mix,
Shaping test piece in 1h after mix completes；
E. lower cushion block supporting for die trial is put into the bottom of die trial, exposes about 2cm, expose size can suitably increase or
Reduce, but can not be the least, otherwise test specimen can be pressed completely into die trial；Exposing size can not be too big, otherwise can cause compound
Can not be completely filled with.Compound is divided 2-3 time and pour into die trial, the most slotting the most real with ramming rod after pouring into every time.Compound should be big
Die trial is filled up in cause, makes the upper cushion block supporting with die trial can just put into die trial, the mixture quality m that record is inserted1；
F. whole die trial being placed on forcing press, with the loading speed of 1mm/min, (can not load too fast, too fast building stones are broken
, the too slow time is the most oversize) and it is pressurized to 500KN, unload after maintaining pressure 2min；
G. by measuring height h after the die trial demoulding, calculate test specimen volume V, weigh test specimen quality m2；
H. with cement dose as c, mixture moisture content is w, calculates water content ω and dry density ρ；
I. with water content ω as transverse axis, dry density ρ is that the longitudinal axis sets up secondary relation curve, and taking dry density extreme value is maximum dry
Density, taking water content corresponding to maximum dry density is optimum moisture content.
When implementing step A, code requirement specified grading scope intermediate value is as design grating, and concrete grating is as shown in the table:
Die trial size is selected according to nominal maximum aggregate size.
When implementing step B, the method in code requirement T0804-1994 prepares 7 samples, and these 7 samples correspondences 7 are not
Same water content (2.6%, 3.6%, 4.1%, 4.6%, 5.1%, 5.6%, 6.6%), wherein, in grating, particle diameter is 0-
The fine grained soil of 9.5mm weighs 210-240g, and particle diameter is that the middle grain soil of 9.5-26.5mm weighs 2000-2200g；Particle diameter is 26.5-
The coarse-grained soil of 31.5mm weighs 6000-6400g.
When implementing step C, the method provided in code requirement T0843-2009 is to the test portion of preparation in step B individually
Carrying out shelving, shelving amount of water is than the predetermined low 1%-2% of water content, and die trial inwall is smeared machine oil.It is glutinous if gathered materials
Matter soil, enclosing material time is 12-24h；If slity soil, enclosing material time is 6-8h；If sandy soil, gravel soil, laterite sand
Gravel, graded gravel etc., enclosing material time can foreshorten to 4h；Containing not sieved rubble, gravel and sand that soil is little, enclosing material time can shorten
To 2h.
When implementing step D, by No. 42.5 common silicic acid of c=3% (account for and gather materials and the percentage by weight of cement gross weight)
7 test portions after salt cement and shelving carry out mix respectively and form 7 parts of compounds, during mix, add predetermined moisture content and remain
Remaining 1%-2%, and after mix completes, shaping test piece in 1 hour, and the shaping test piece time is the shortest more good.
When implementing step E, 7 parts of compounds being respectively filled in die trial, every part of compound divides 2-3 time to be inserted, and record is inserted
Mixture quality m1。
When implementing step F, it is pressurized to 500KN with the LOADING RATES of 1mm/min, unloads after maintaining pressure 2min.
When implementing step H, bring parameters into formulaIn, it is calculated 7
Water content ω=0.04131,0.04247,0.04324,0.04452,0.04528,0.04634,0.04748.
And parameters is brought into formulaIn, it is calculated 7 corresponding doing
Density (unit g/cm3) ρ=2.0436,2.1043,2.2948,2.3328,2.3304,2.3146 2.3029.
Wherein ω Cement Stable Macadam Mixture water content；
ρ Cement Stable Macadam Mixture dry density；
W combined amount water content；
m1The mixture quality in die trial is inserted before applying pressure；
The cement dose added during c mix compound；
m2Test specimen quality after applying pressure, after the demoulding；
Test specimen volume after V applies pressure, after the demoulding.
When implementing step I, 7 water content obtained in step H are as transverse axis, with accordingly 7 dry densities as the longitudinal axis,
Setting up conic section, and to take dry density mechanism be maximum dry density, corresponding water content is optimum moisture content.Its dry density extreme value
(i.e. maximum dry density) is 2.33g/cm3, corresponding optimum moisture content is 4.4%.
Under conditions of cement dose is 3%, carry out compaction test equally, obtain cement dose when being 3%, the most aqueous
Amount is 4.6%, and maximum dry density is 2.32g/cm3。
Visible, use the cement stabilized macadam of the present invention to use the knot of the maximum dry density that determines of static pressure method and compaction test
Really error is (2.33-2.32)/2.32 × 100%=0.43%, the error of optimum moisture content be (4.6-4.4)/4.6 ×
100%=4.35%, all within 5%, illustrates that the optimum moisture content of the cement stabilized macadam that the present invention provides and maximum dry are close
Degree determines the effectiveness of method.
Embodiment 2.1
A kind of optimum moisture content using static pressure method and maximum dry density determine method, substantially the same manner as Example 1, different
, cement content is 4%, uses the method that the present invention provides, and when implementing step H, being calculated water content is 0.04239,
0.04328,0.04453,0.04547,0.04636,0.04712,0.04846；Dry density (unit g/cm3) it is 1.9948,
2.0564,2.2463,2.3438,2.3396,2.3046,2.2946.When implementing step I, the water content dry density of foundation
Secondary relation curve, obtains using the optimum moisture content of the cement stabilized macadam of present invention offer and maximum dry density to determine method
Maximum dry density ρ obtained is 2.34g/cm3, optimum moisture content ω is 4.5%.
Under the conditions of cement dose is 4%, carrying out compaction test, obtaining maximum dry density ρ is 2.34g/cm3, most preferably contain
Water yield ω is 4.7%.
Visible, use the cement stabilized macadam of the present invention to use the knot of the maximum dry density that determines of static pressure method and compaction test
Really error is 0, and the error of optimum moisture content is 4.26%, all within 5%, the cement stabilized macadam that the present invention provides is described
Optimum moisture content and maximum dry density determine the effectiveness of method.
Embodiment 2.2
A kind of optimum moisture content using static pressure method and maximum dry density determine method, substantially the same manner as Example 1, different
, cement content is 5%, uses the method that the present invention provides, and when implementing step H, being calculated water content is 0.04239,
0.04328,0.04453,0.04634,0.04753,0.04838,0.04926, dry density (unit g/cm3) it is 1.8924,
2.1035,2.1754,2.3548,2.3494,2.3406,2.3357.When implementing step I, the water content dry density of foundation
Secondary relation curve, obtains using the optimum moisture content of the cement stabilized macadam of present invention offer and maximum dry density to determine method
Maximum dry density ρ obtained is 2.35g/cm3, optimum moisture content ω is 4.6%.
Under the conditions of cement dose is 5%, carrying out compaction test, obtaining maximum dry density ρ is 2.33g/cm3, most preferably contain
Water yield ω is 4.7%.
Visible, that the cement stabilized macadam cement stabilized macadam of the employing present invention determines maximum dry density and compaction test
Resultant error is 0.86%, and the error of optimum moisture content is 2.13%, all within 5%, illustrates that the cement that the present invention provides is steady
Determine the optimum moisture content of rubble and maximum dry density determines the effectiveness of method.
Embodiment 2.3
A kind of optimum moisture content using static pressure method and maximum dry density determine method, substantially the same manner as Example 1, different
, cement content is 6%, and when implementing step H, being calculated water content is 0.04216,0.04348,0.04406,
0.04613,0.04733,0.04806,0.04943, dry density (unit g/cm3) it is 1.9235,2.1154,2.1853,
2.3503,2.3414,2.3391,2.2347.When implementing step I, the secondary relation curve of the water content dry density of foundation,
Optimum moisture content and maximum dry density to the cement stabilized macadam using the present invention to provide determine that the maximum dry that method obtains is close
Degree ρ is 2.35g/cm3, optimum moisture content ω is 4.6%.
Under the conditions of cement dose is 6%, carrying out compaction test, obtaining maximum dry density ρ is 2.34g/cm3, most preferably contain
Water yield ω is 4.8%.
Visible, that the cement stabilized macadam cement stabilized macadam of the employing present invention determines maximum dry density and compaction test
Resultant error is 0.43%, and the error of optimum moisture content is 4.17%, all within 5%, illustrates that the cement that the present invention provides is steady
Determine the optimum moisture content of rubble and maximum dry density determines the effectiveness of method.
Embodiment 3.1
A kind of optimum moisture content using static pressure method and maximum dry density determine method, with embodiment 1 2.1 or 2.2 or
2.3 is essentially identical, except for the difference that, when implementing step F, is pressurized to 500KN with the LOADING RATES of 1mm/min, after maintaining pressure 5min
Unloading, its result is constant.
Embodiment 3.2
A kind of optimum moisture content using static pressure method and maximum dry density determine method, with embodiment 1 2.1 or 2.2 or
2.3 is essentially identical, except for the difference that, when implementing step F, is pressurized to 500KN with the LOADING RATES of 1mm/min, after maintaining pressure 3min
Unloading, its result is constant.
Embodiment 3.3
A kind of optimum moisture content using static pressure method and maximum dry density determine method, with embodiment 1 2.1 or 2.2 or
2.3 is essentially identical, except for the difference that, when implementing step F, is pressurized to 500KN with the LOADING RATES of 1mm/min, after maintaining pressure 7min
Unloading, its result is constant.
Embodiment 3.4
A kind of optimum moisture content using static pressure method and maximum dry density determine method, with embodiment 1 2.1 or 2.2 or
2.3 is essentially identical, except for the difference that, when implementing step F, is pressurized to 500KN with the LOADING RATES of 1mm/min, after maintaining pressure 10min
Unloading, its result is constant.
Embodiment 3.5
A kind of optimum moisture content using static pressure method and maximum dry density determine method, with embodiment 1 2.1 or 2.2 or
2.3 is essentially identical, except for the difference that, when implementing step F, is pressurized to 500KN with the LOADING RATES of 1mm/min, after maintaining pressure 30min
Unloading, its result is constant.
Embodiment 3.6
A kind of optimum moisture content using static pressure method and maximum dry density determine method, with embodiment 1 2.1 or 2.2 or
2.3 is essentially identical, except for the difference that, when implementing step F, is pressurized to 500KN with the LOADING RATES of 1mm/min, after maintaining pressure 50min
Unloading, its result is constant.
Embodiment 3.7
A kind of optimum moisture content using static pressure method and maximum dry density determine method, with embodiment 1 2.1 or 2.2 or
2.3 is essentially identical, except for the difference that, when implementing step F, is pressurized to 500KN with the LOADING RATES of 1mm/min, maintains pressure 120min
Rear unloading, its result is constant.
Embodiment 1 and embodiment 3.1-3.7 explanation, implement step F time, under the load of 500KN maintain 2min and more than,
Ensure that test specimen not resilience, thus ensure the accuracy of measurement result.Meanwhile, inventor also maintains under the load of 500KN
1min, result shows, after laying down load, test specimen resilience, when causing implementing step G, time elevation carrection after the demoulding is forbidden
Really, test specimen stereometer is not calculated accurately really, thus affects the result of calculation of water content and dry density, the maximum dry density that finally gives and
Optimum moisture content differs bigger with compaction test.
Embodiment 4.1
A kind of optimum moisture content using static pressure method and maximum dry density determine method, substantially the same manner as Example 1, different
, when implementing step B, prepare 6 test portions, corresponding water content is 2.6%, 3.6%, 4.1%, 4.6%, 5.1%, 5.6%.
Embodiment 4.2
A kind of optimum moisture content using static pressure method and maximum dry density determine method, substantially the same manner as Example 1, different
, when implementing step B, prepare 8 test portions, correspondence water content is 2.6%, 3.6%, 4.1%, 4.6%, 5.1%, 5.6%,
6.6%, 7.6%.
Embodiment 4.3
A kind of optimum moisture content using static pressure method and maximum dry density determine method, substantially the same manner as Example 1, different
, when implementing step B, prepare 5 test portions, corresponding water content is 3.6%, 4.1%, 4.6%, 5.1%, 5.6%.
Embodiment 4.1-4.3 is used for illustrating the test portion number of preparation, does not limit water content therein, this area skill
Art personnel can select voluntarily.
It should be noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although
With reference to foregoing embodiments, the present invention is described in detail, it will be understood by those within the art that: it is still
Technical scheme described in foregoing embodiments can be modified, or the most some or all of technical characteristic is carried out
Equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technical side
The scope of case.
Claims (10)
1. the optimum moisture content and the maximum dry density that use static pressure method determine a method, apply pressure including to shaping test piece；
Calculate water content ω and dry density ρ；With water content ω as transverse axis, dry density ρ is that the longitudinal axis sets up secondary relation curve, takes dry density
Extreme value is maximum dry density, and taking water content corresponding to maximum dry density is optimum moisture content.
2. optimum moisture content as claimed in claim 1 and the determination method of maximum dry density, it is characterised in that: described molding tries
The preparation of part comprises the following steps:
A. the test portion that predetermined moisture content w is different is prepared；
B. test portion is carried out shelving；
C., after shelving completes, the cement the mix that add predetermined quantity c are uniform, shaping test piece in 1h after mix completes.
3. optimum moisture content as claimed in claim 2 and the determination method of maximum dry density, it is characterised in that: implement step A
Time, 58 parts of test portions that preparation predetermined moisture content w is different.
4. optimum moisture content as claimed in claim 2 and the determination method of maximum dry density, it is characterised in that: implement step A
Time, 67 parts of test portions that preparation predetermined moisture content w is different.
5. the optimum moisture content as described in claim 3 or 4 and the determination method of maximum dry density, it is characterised in that:, implement step
Rapid B, during shelving, smears machine oil by die trial inwall.
6. optimum moisture content as claimed in claim 5 and the determination method of maximum dry density, it is characterised in that:, implement step
B, during shelving, amount of water is lower by 1% 2% than predetermined moisture content.
7. optimum moisture content as claimed in claim 6 and the determination method of maximum dry density, it is characterised in that: implement step C,
During shaping test piece, die trial size used selects according to the nominal maximum aggregate size of design grating.
8. optimum moisture content as claimed in claim 7 and the determination method of maximum dry density, it is characterised in that: implement step C
Time, during mix, reserved water is added.
9. optimum moisture content as claimed in claim 8 and the determination method of maximum dry density, it is characterised in that: shaping test piece
Time, the supporting lower cushion block of die trial is put into the bottom of die trial, is exposed 2cm, divided by compound 23 times and pour into die trial, after pouring into every time
The most uniformly inserting real with ramming rod, compound should substantially fill up die trial, makes the upper cushion block supporting with die trial can just put into die trial, note
The mixture quality m that record is inserted1。
10. optimum moisture content as claimed in claim 9 and the determination method of maximum dry density, it is characterised in that: apply pressure
Time, pressurize with the loading speed of 1mm/min.
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