CN106257466A - A kind of determination method of compound compaction test predetermined moisture content - Google Patents
A kind of determination method of compound compaction test predetermined moisture content Download PDFInfo
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- CN106257466A CN106257466A CN201610407020.XA CN201610407020A CN106257466A CN 106257466 A CN106257466 A CN 106257466A CN 201610407020 A CN201610407020 A CN 201610407020A CN 106257466 A CN106257466 A CN 106257466A
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- 238000005056 compaction Methods 0.000 title claims abstract description 63
- 150000001875 compounds Chemical class 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000004568 cement Substances 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 45
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims description 23
- 238000010521 absorption reaction Methods 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 10
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 8
- 239000011707 mineral Substances 0.000 description 8
- 239000002689 soil Substances 0.000 description 8
- 238000005461 lubrication Methods 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004836 empirical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- Pure & Applied Mathematics (AREA)
- Evolutionary Computation (AREA)
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- Civil Engineering (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The present invention provides a kind of determination method of compound compaction test predetermined moisture content, including by mixing of gathering materials under breeze and sieve that sieve diameter is 0.6mm, and calculated the upper and lower bound of predetermined moisture content by below equation: the lower limit ω of the upper limit predetermined moisture content of predetermined moisture contentdown=Nc×ωc+(Nf+C)×ωfcr.The determination method of the compound compaction test predetermined moisture content that the present invention provides, the determination of predetermined moisture content that multiple material mixes the compaction test of the compound joined can be used for, define the upper and lower bound of the predetermined moisture content of cement stabilized macadam compaction test, make multiple material mix the compound joined in water content ranges more accurately, carry out compaction test, the workload of compaction test can be saved, and real result can be hit more accurately.
Description
Technical field
Present invention is mainly used for Transportation and Civil Engineering field, in particular it relates to a kind of compound compaction test is pre-
Fixed aqueous method for determination of amount.
Background technology
Compaction test, as the determination method of maximum dry density and optimum moisture content, is widely used in semi-rigid material stable
The multiple materials such as class, emulsified asphalt Stabilized and subgrade soils, but for predetermined moisture content determination still only the most by rule of thumb, lack
The determination method of one predetermined moisture content accurately.Compaction test code T0804 1994 proposes: for fine grained soil, can refer to
Its plastic limit estimates the optimum moisture content of element soil；The optimum moisture content that natural grit soil, grating are gathered materials etc. and the middle particulate that gathers materials
The content of soil is relevant with plasticity index, typically between 5% 12%.For for sieving rubble, its optimum moisture content is close to 5%.
Gravel soil on the high side for fine earth, plasticity index is bigger, its optimum moisture content is about 10%.Cement treated material optimal
Water content is close with element soil, Calx, flyash stabilizing material optimum moisture content may more plain soil big 1% 3%.
Empirical method determines that predetermined moisture content has certain foundation, but mixes the compound joined also for multiple material
Inapplicable, the particularly semi-rigid material of regeneration.The predetermined moisture content of compaction test is if it is determined that inaccurate will increase
The workload of compaction test.Predetermined moisture content determines the interval that accurately can reduce water content, and the tamping curve of matching is more accurate,
So that it is determined that optimum moisture content and maximum dry density the most accurate.
Summary of the invention
It is an object of the invention to provide a kind of determination method of compound compaction test predetermined moisture content, can be used for multiple
The determination of the predetermined moisture content of the compaction test of the compound joined mixed by material so that multiple material mixes the compound joined
In water content ranges more accurately, carry out compaction test, thus hit real result more accurately.
The purpose of the present invention is achieved by the following scheme:
A kind of determination method of compound compaction test predetermined moisture content, including being 0.6mm's by breeze and sieve diameter
Gather materials under sieve mixing, and calculated the upper and lower bound of predetermined moisture content by below equation:
The upper limit of predetermined moisture content
The lower limit ω of predetermined moisture contentdown=Nc×ωc+(Nf+C)×ωfcr；
Wherein, ρcrCement density；
ρfGather materials under the sieve of sieve diameter 0.6mm apparent density；
ωfcrThe dry water absorption rate of compound saturation plane of breeze and fine aggregate；
ωcThe surface drying water absorption rate more than design grating 0.6mm gathered materials；
What ρ dried fine aggregate and cement admixture tightly fills density；
NcThe mass percent of coarse aggregate；
NfThe mass percent of fine aggregate；
C cement dose.
Preferably, cement density ρcrObtained by measurement.
In any of the above-described scheme preferably, gather materials under the sieve of sieve diameter 0.6mm apparent density ρfObtained by mensuration.
In any of the above-described scheme preferably, the compound saturation plane dry water absorption rate ω of breeze and fine aggregatefcrBy measuring
Obtain.
In any of the above-described scheme preferably, with when removing when slump cylinder occurs slump for the first time as saturated dry surface.
In any of the above-described scheme preferably, the surface drying water absorption rate ω more than design grating 0.6mm gathered materialscBy measuring
Arrive.
In any of the above-described scheme preferably, the tight dress density p drying fine aggregate and cement admixture is obtained by mensuration.
In any of the above-described scheme preferably, described compound compaction test predetermined moisture content determines that method includes following step
Rapid:
A, mensuration cement density ρcr；
B, measure below 0.6mm and gather materials apparent density ρf；
C, with breeze substitute cement and below 0.6mm fine aggregate mixing after, measure mixture the dry water absorption rate of saturation plane
ωfcr；Because cement can occur hydration reaction, so replacing cement with breeze to measure the dry water absorption rate of saturation plane, cement concrete
Will roll as early as possible after mix, optimum moisture content is to ensure that the optimum water of construction workability, be not needed for hydration reaction
The good water yield；
The surface drying water absorption rate ω more than D, mensuration design grating 0.6mm gathered materialsc；
E, fine aggregate is dried, and measure dry fine aggregate and cement admixture tightly fill density p；
F, with the mass percent of coarse aggregate as Nc, the mass percent of fine aggregate is Nf=1 Nc, cement dose is C, meter
Calculate the upper limit of predetermined moisture content
Calculate the lower limit ω of predetermined moisture contentdown=Nc×ωc+(Nf+C)×ωfcr；
Wherein, step A E implements with random order, is then carried out step F.
In any of the above-described scheme preferably, the drying temperature of described drying fine aggregate is 100 200 DEG C.
In any of the above-described scheme preferably, described drying temperature is 105 150 DEG C.
In any of the above-described scheme preferably, described drying temperature is 105 120 DEG C.
In any of the above-described scheme preferably, particle diameter and the cement of described breeze are close.
In any of the above-described scheme preferably, described compound is cement stabilized macadam.
In any of the above-described scheme preferably, described cement dose C=3 6%.
The present invention rationale here is that: the boundary sieve aperture gathered materials for thickness with 0.6mm, and sieve diameter is the sieve of 0.6mm
Under gather materials and become fine aggregate, sieve gathers materials referred to as coarse aggregate.The water that design grating absorbs includes three parts: coarse aggregate dry face state
Water, the water of fine aggregate dry face state absorption and the lubrication water in mineral aggregate gap absorbed.Because the specific surface area of fine aggregate is much larger than
Coarse aggregate, it is believed that the lubrication water in mineral aggregate gap is mainly the water in fine aggregate mineral aggregate gap.Table is entirely reached with thick, fine aggregate
Dry state and mineral aggregate gap do not have during water to be the lower limit of predetermined moisture content, with coarse aggregate surface drying, dry fine aggregate and cement tightly fills
It it is the upper limit of predetermined moisture content when completely filling out water under state between space.
The determination method of compound compaction test predetermined moisture content that the present invention provides, can be used for multiple material and mix to join and form
The determination of predetermined moisture content of compaction test of compound (such as cement stabilized macadam), define cement stabilized macadam and hit reality
The upper and lower bound of the predetermined moisture content of test so that multiple material (such as cement stabilized macadam) mixes the compound joined more
Compaction test is carried out accurately, it is possible to save the workload of compaction test, and reality can be hit more accurately in water content ranges
Result.
Detailed description of the invention
In order to be more clearly understood that the summary of the invention of the present invention, below in conjunction with the specific embodiment summary of the invention to the present invention
It is further illustrated.
Embodiment 1
A kind of compound compaction test predetermined moisture content determines method, comprises the following steps successively:
A, according to specification GB/T208 2014 method measure cement density ρcr；
B, apparent density ρ of gathering materials according to specification T0330 2005 method mensuration below 0.6mmf；
C, substitute cement and the mixing of below 0.6mm fine aggregate with breeze after, measure mixed according to specification T0330 2005 method
The saturation plane dry water absorption rate ω of compoundfcr；
D, measure the surface drying water absorption rate ω that gathers materials of more than design grating 0.6mm according to specification T0307 2005 methodc；
E, by fine aggregate 105 DEG C of drying, and measure according to specification T0331 1994 and dry fine aggregate and cement admixture
Tightly fill density p；
F, with the mass percent of coarse aggregate as Nc, the mass percent of fine aggregate is Nf=1 Nc, cement dose is C, meter
Calculate the upper limit of predetermined moisture content
Calculate the lower limit ω of predetermined moisture contentdown=Nc×ωc+(Nf+C)×ωfcr；
Wherein, ρcrCement density；
ρfGather materials under the sieve of sieve diameter 0.6mm apparent density；
ωfcrThe dry water absorption rate of compound saturation plane of breeze and fine aggregate；
ωcThe surface drying water absorption rate more than design grating 0.6mm gathered materials；
What ρ dried fine aggregate and cement admixture tightly fills density；
NcThe mass percent of coarse aggregate；
NfThe mass percent of fine aggregate；
C cement dose.
The compaction test predetermined moisture content that the present embodiment provides determines that method is for determining cement stabilized macadam compaction test
Predetermined moisture content, implement the present embodiment when, code requirement specified grading scope intermediate value as design grating, concrete grating
As shown in the table:
According to design grating, it is to be understood that, mass percent Nf=15% of the lower fine aggregate of the sieve of sieve diameter 0.6mm, sieve
Mass percent Nc=85% of the upper coarse aggregate of sieve of bore dia 0.6mm.
In the present embodiment, using No. 42.5 portland cements, the specific surface area of cement is 300m2/ kg, and cement dose C
It is 3%.
When implementing step A, recording cement density is 3.0g/cm3。
When implementing step B, record apparent density ρ of the lower fine aggregate of sieve of sieve diameter 0.6mmfFor 2.695g/cm3。
When implementing step C, the specific surface area with 3% is 300m2(can fluctuate/kg 50m2/ kg) limestone dust replacement
The cement of 3%, mixes with fine aggregate under the sieve of sieve diameter 0.6mm, and when removing slump cylinder and occurring and collapsing for the first time to be
Saturated dry surface, the saturation plane dry water absorption rate ω of the mixture recording breeze and fine aggregatefcrIt is 3.48%.
When implementing step D, record the surface drying water absorption rate ω of the upper coarse aggregate of sieve of sieve diameter 0.6mmcIt is 2.63%.
When implementing step E, measure and fine aggregate dried at 105 DEG C, and record drying fine aggregate and cement admixture
Tight dress density p is 1.660g/cm3。
When implementing step F, by mass percent N of lower for the sieve of sieve diameter 0.6mm fine aggregatef=15%, sieve diameter
Mass percent N of the upper coarse aggregate of sieve of 0.6mmc=85%, cement dose C=3%, and relevant parameter brings formula intoIn, it is calculated cement dose when being 3%, the predetermined moisture content of cement stabilized macadam
The upper limit is ωup=5.92%, predetermined moisture content lower limit ωdown=2.86%.
In order to determine the effectiveness of the determination method of compound compaction test predetermined moisture content that the present invention provides, hit
Real test, obtains cement dose when be 3%, and the optimum moisture content of cement stabilized macadam is 4.4%.Compaction test obtains
The predetermined moisture content scope of the determination method of the compound compaction test predetermined moisture content that optimum moisture content provides in the present invention it
In, the effectiveness of the determination method of the compound compaction test predetermined moisture content that the present invention provides is described.
Step A-E in the present embodiment can be implemented with random order.
The boundary sieve aperture gathered materials for thickness with 0.6mm, sieve diameter be 0.6mm sieve under gather materials and become fine aggregate, on sieve
Gather materials referred to as coarse aggregate.The water that design grating absorbs includes three parts: water that coarse aggregate dry face state absorbs, fine aggregate surface drying shape
The water of state absorption and the lubrication water in mineral aggregate gap.Because the specific surface area of fine aggregate is much larger than coarse aggregate, it is believed that between mineral aggregate
The lubrication water of gap is mainly the water in fine aggregate mineral aggregate gap.So that thick, fine aggregate entirely reach dry face state, mineral aggregate gap does not has
It is the lower limit of predetermined moisture content during water, with coarse aggregate surface drying, dries and completely fill out between space under fine aggregate and cement tightly dress state
It it is the upper limit of predetermined moisture content during water.
The determination method of compound compaction test predetermined moisture content that the present embodiment provides, can be used for multiple material mix join and
The determination of the predetermined moisture content of the compaction test of the compound (such as cement stabilized macadam) become, defines cement stabilized macadam and hits
The upper and lower bound of the predetermined moisture content of real test so that multiple material (such as cement stabilized macadam) is mixed the compound joined and existed
Compaction test is carried out more accurately, it is possible to save the workload of compaction test, and can be hit more accurately in water content ranges
Real result.
Embodiment 2
A kind of determination method of compound compaction test predetermined moisture content, substantially the same manner as Example 1, difference exists
In: in the present embodiment, cement dose is 4.5%.
In the present embodiment, when implementing step C, the limestone dust with 4.5% replaces the cement of 4.5%, with sieve diameter
Fine aggregate mixing under the sieve of 0.6mm, and when removing when slump cylinder occurs slump for the first time as saturated dry surface, to record breeze
Saturation plane dry water absorption rate ω with the mixture of fine aggregatefcrIt is 3.65%.
In the present embodiment, when implementing step E, measure and fine aggregate is dried at 105 DEG C, and record drying fine aggregate and water
The tight dress density p of mud mixture is 1.707g/cm3。
In the present embodiment, when implementing step F, by mass percent N of lower for the sieve of sieve diameter 0.6mm fine aggregatef=
Mass percent N of the upper coarse aggregate of sieve of 15%, sieve diameter 0.6mmc=85%, cement dose C=4.5%, and join accordingly
Number brings formula intoIn, it is calculated cement dose when being 4.5%, cement stabilized macadam
The predetermined moisture content upper limit be ωup=6.87%, predetermined moisture content lower limit ωdown=2.95%.
Equally, in order to determine the effectiveness of the determination method of compound compaction test predetermined moisture content that the present invention provides,
Carrying out compaction test, obtain cement dose when be 4.5%, the optimum moisture content of cement stabilized macadam is 4.6%.Hit real examination
Test determination method predetermined of the compound compaction test predetermined moisture content that the optimum moisture content 4.6% that obtains provides in the present invention
Within water content ranges (2.95-6.87%), the determination side of the compound compaction test predetermined moisture content that the present invention provides is described
The effectiveness of method.
Embodiment 3
A kind of determination method of compound compaction test predetermined moisture content, substantially the same manner as Example 1, difference exists
In: in the present embodiment, cement dose is 6%.
In the present embodiment, when implementing step C, the limestone dust with 6% replaces the cement of 6%, with sieve diameter 0.6mm
Sieve under fine aggregate mixing, and with when removing slump cylinder and occurring for the first time collapsing as saturated dry surface, record breeze and thin
The saturation plane dry water absorption rate ω of the mixture gathered materialsfcrIt is 3.76%.
In the present embodiment, when implementing step E, measure and fine aggregate is dried at 105 DEG C, and record drying fine aggregate and water
The tight dress density p of mud mixture is 1.739g/cm3。
In the present embodiment, when implementing step F, by mass percent N of lower for the sieve of sieve diameter 0.6mm fine aggregatef=
Mass percent N of the upper coarse aggregate of sieve of 15%, sieve diameter 0.6mmc=85%, cement dose C=6%, and relevant parameter
Bring formula intoIn, it is calculated cement dose when being 6%, cement stabilized macadam pre-
Determining the water content upper limit is ωup=5.60%, predetermined moisture content lower limit ωdown=3.03%.
Equally, in order to determine the effectiveness of the determination method of compound compaction test predetermined moisture content that the present invention provides,
Carrying out compaction test, obtain cement dose when be 6%, the optimum moisture content of cement stabilized macadam is 4.6%.Compaction test
The optimum moisture content 4.6% obtained contained in the predetermined of determination method of the compound compaction test predetermined moisture content that the present invention provides
Within water yield scope (3.03-5.60%), the determination method of the compound compaction test predetermined moisture content that the present invention provides is described
Effectiveness.
Embodiment 4.1
A kind of determination method of compound compaction test predetermined moisture content, essentially identical with above-described embodiment, difference
It is: when implementing step E, fine aggregate is dried at 120 DEG C.
Embodiment 4.2
A kind of determination method of compound compaction test predetermined moisture content, essentially identical with above-described embodiment, difference
It is: when implementing step E, fine aggregate is dried at 150 DEG C.
Embodiment 4.3
A kind of determination method of compound compaction test predetermined moisture content, essentially identical with above-described embodiment, difference
It is: when implementing step E, fine aggregate is dried at 170 DEG C.
Embodiment 4.4
A kind of determination method of compound compaction test predetermined moisture content, essentially identical with above-described embodiment, difference
It is: when implementing step E, fine aggregate is dried at 200 DEG C.
Embodiment 4.5
A kind of determination method of compound compaction test predetermined moisture content, essentially identical with above-described embodiment, difference
It is: when implementing step E, fine aggregate is dried at 100 DEG C.
Embodiment 5.1
A kind of determination method of compound compaction test predetermined moisture content, essentially identical with above-described embodiment, difference
It is: the specific surface area of cement used is 350m2/ kg, therefore, when implementing step C, breeze specific surface area used is 350m2/ kg,
Can be fluctuated 50m2/kg。
Embodiment 5.2
A kind of determination method of compound compaction test predetermined moisture content, essentially identical with above-described embodiment, difference
It is: the specific surface area of cement used is 370m2/ kg, therefore, when implementing step C, breeze specific surface area used is 370m2/ kg,
Can be fluctuated 50m2/kg。
Embodiment 5.3
A kind of determination method of compound compaction test predetermined moisture content, essentially identical with above-described embodiment, difference
It is: the specific surface area of cement used is 400m2/ kg, therefore, when implementing step C, breeze specific surface area used is 400m2/ kg,
Can be fluctuated 50m2/kg。
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. a determination method for compound compaction test predetermined moisture content, including being the sieve of 0.6mm by breeze and sieve diameter
Under gather materials mixing, and calculated the upper and lower bound of predetermined moisture content by below equation:
The upper limit of predetermined moisture content
The lower limit ω of predetermined moisture contentdown=Nc×ωc+(Nf+C)×ωfcr；
Wherein, ρcrCement density；
ρfGather materials under the sieve of sieve diameter 0.6mm apparent density；
ωfcrThe dry water absorption rate of compound saturation plane of breeze and fine aggregate；
ωcThe surface drying water absorption rate more than design grating 0.6mm gathered materials；
What ρ dried fine aggregate and cement admixture tightly fills density；
NcThe mass percent of coarse aggregate；
NfThe mass percent of fine aggregate；
C cement dose.
2. the determination method of compound compaction test predetermined moisture content as claimed in claim 1, it is characterised in that: cement density
ρcrObtained by measurement.
3. the determination method of compound compaction test predetermined moisture content as claimed in claim 1, it is characterised in that: sieve diameter
Gather materials under the sieve of 0.6mm apparent density ρfObtained by mensuration.
4. the determination method of compound compaction test predetermined moisture content as claimed in claim 1, it is characterised in that: breeze is with thin
The compound saturation plane dry water absorption rate ω gathered materialsfcrObtained by mensuration.
5. the determination method of compound compaction test predetermined moisture content as claimed in claim 1, it is characterised in that: with when removing
Slump cylinder is saturated dry surface when occurring and collapsing for the first time.
6. the determination method of compound compaction test predetermined moisture content as claimed in claim 1, it is characterised in that: design grating
The surface drying water absorption rate ω that more than 0.6mm gathers materialscObtained by mensuration.
7. the determination method of compound compaction test predetermined moisture content as claimed in claim 1, it is characterised in that: dry thin collection
The tight dress density p of material and cement admixture is obtained by mensuration.
8. the determination method of compound compaction test predetermined moisture content as claimed in claim 1, it is characterised in that: described mixing
Material compaction test predetermined moisture content determines that method comprises the following steps:
A, mensuration cement density ρcr；
B, measure below 0.6mm and gather materials apparent density ρf；
C, substitute with breeze under the sieve of cement and sieve diameter 0.6mm after fine aggregate mixing, measure that the saturation plane of mixture is dry inhales
Water rate ωfcr；
The surface drying water absorption rate ω more than D, mensuration design grating 0.6mm gathered materialsc；
E, fine aggregate is dried, and measure dry fine aggregate and cement admixture tightly fill density p；
F, with the mass percent of coarse aggregate as Nc, the mass percent of fine aggregate is Nf=1 Nc, cement dose is C, calculates pre-
Determine the upper limit of water content
Calculate the lower limit ω of predetermined moisture contentdown=Nc×ωc+(Nf+C)×ωfcr；
Wherein, step A E implements with random order, is then carried out step F.
9. the determination method of the compound compaction test predetermined moisture content as described in claim 1 or 8, it is characterised in that: described
The drying temperature drying fine aggregate is 100 200 DEG C.
10. the determination method of compound compaction test predetermined moisture content as claimed in claim 9, it is characterised in that: described baking
Dry temperature is 105 150 DEG C.
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