CN101793638B - Method for preparing road base material cylindrical test piece simulating on-site rolling effect - Google Patents

Abstract

The invention discloses a method for preparing a road (bottom) base material cylindrical test piece simulating on-site rolling effect. The vibration compaction test method is adopted to determine the maximum dry density rhodmax and the optimal moisture content wo and the vibration method is adopted to prepare the cylindrical test piece. The operation process of the method corresponds to the on-site practical construction process. The maximum dry density and the optimal moisture content of the tested (bottom) base material and the prepared test piece coincide with the on-site practical rolling effect. The test result of the performance of the test piece is objective and real; and the method has good repeatability. Steps of measuring the moisture content of dried aggregates and moisture content of dried test samples, a step of interlayer broom-finish treatment, a step of flattening the surface of the samples and the like are saved; the material feeding process is simplified; and the working efficiency is improved. The method has the advantages of simple operation, reliable result and good repeatability.

Description

The method for preparing road base material cylindrical test piece of simulated field rolling effect

Technical field

The invention belongs to the Transportation and Civil Engineering field, relate to a kind of highway (end) base material cylindrical test material preparation method of simulated field rolling effect.This method is easy and simple to handle fast, the test result objective reality of the test specimen performance of preparation reflection (end) base material actual performance, and favorable reproducibility.

Background technology

At present, adopt the compaction test method to determine highway (end) base material maximum dry density ρ _DmaxWith optimum moisture content w _o, according to the ρ of compaction test method _DmaxAnd w _oBe equipped with highway (end) base material cylindrical test specimen with static(al) compacting legal system, its principle and step are as follows:

(1) compacting process is determined the ρ of highway (end) base material _DmaxAnd w _o, experimental procedure is:

1. in pre-compaction test customized the previous day, get representational test portion and measure its air-dry water cut, take by weighing at least 5 parts of test portions, every part of air-dry quality is about 4.4kg (fine grained soil) or 5.5kg (middle grain soil or coarse-grained soil).

2. predetermined 5～6 different moisture contents differ 1%～2% successively, and wherein have at least two greater than with two less than w _o, prepare sample by predetermined moisture content, needed inorganic binder is added to uniform mixing in the test portion after the infiltration.

3. get and pour into about the sample 1.8kg for preparing in internal diameter 152mm * high 120mm compaction cylinder (about the thick about 4cm of sample), flatten its surface, and after compressing a little, carry out the reality of hitting of ground floor sample, hit altogether real 98 times; Ground floor hits real finishing, and will hit real surface " plucking " with scraper or screwdriver, repeats above-mentioned way then, carries out the reality of hitting of all the other two-layer samples; Behind the last examination sample compacting, sample exceeds a height on top must not be greater than 6mm, and exceeding highly excessive test specimen should cancel.

4. take off the collar, and scrape flat sample, wipe base plate, take cushion block away, clean the examination drum outer wall, weigh, calculate wet density with the top carefulness of the neat tube of scraper.

5. release sample in the tube with stripper, get two representative samples respectively, place 110 ℃ of drying in oven, measure its water cut w, calculate dry density ρ to constant weight from the sample upper and lower _d

6. 2.～5. way of repeating step is tested (end) base material w and ρ under all the other water cut _d, draw ρ _d～w relation curve, the coordinate in length and breadth of hump shape hump is respectively ρ _DmaxAnd w _o

(2) static(al) compacting legal system is equipped with highway (end) base material cylindrical test specimen, and its preparation process is:

1. in predetermined the previous day of doing experiment, get representational test portion and measure its air-dry water cut.Taking by weighing required test portion quality of test specimen of preparation is 5700～6000g.

2. the test portion that takes by weighing is placed in the middle of the rectangle iron pan, in test portion, adds water until reaching the w that compacting process is determined _o, and mix is placed on after evenly, and to soak into the 4h left and right sides in the closed container standby.

3. in the test portion that soaked into, add required inorganic binder and mix, obtain compound.

4. the required mixture quality m=0.01K ρ of test specimen for preparing a predetermined compactness _DmaxV (1+0.01w _o), K is predetermined compactness (%), V is the volume (cm of test specimen ³), ρ _DmaxAnd w _oBe respectively the compound maximum dry density (g/cm that compacting process is determined ³) and optimum moisture content (%).

5. the following compression leg of thick about 40mm is put into the die trial bottom and expose about 20mm, the internal diameter 150mm of described die trial * highly (230 ± 10mm).With quality is in the die trial of packing into of the compound of m, will go up compression leg then and put into die trial and it is also exposed about 20mm.

6. whole die trial (together with compression leg up and down) is put on the lifting jack or pressing machine of reaction frame, pressurization and is kept pressure 1min till compression leg all is pressed into die trial up and down.

5. after the pressure relief, take off die trial, and be put on the stripper compound in the die trial is ejected, be the right cylinder test specimen of preparation.

The compacting process that the applicant has analyzed in the above-mentioned testing regulations is determined highway (end) base material ρ _DmaxAnd w _o, and utilize the static(al) compacting to prepare the method for test specimen, and can not adapt to the needs of development in science and technology and transport development far away, its defective that mainly exists is as follows:

1) compacting process is determined ρ _DmaxAnd w _oThere is following shortcoming:

1. the indoor reality of hitting is different with the on-the-spot vibroroller cmpacting mechanism of action to the compaction mechanism of material;

2. indoorly hit real merit and actual production and shake and grind merit and do not match, indoorly hit real merit and propose, and production reality generally adopts 18～22 tons of Frequency Adjustable amplitude modulated oscillations street rollers based on 8～12 tons of static rollers;

3. optimum moisture content is determined in the water cut process, the real back test specimen water cut of hitting of oven drying method test the part water that part moisture between particle was extruded out and dried hydration reaction consumption in the compound process occurs because of drawing close along with particle, the water cut that makes the test water cut when mixing and stirring is little, does not conform to actual production process;

4. compaction test divides three layers of dress examination sample compacting, misfits the construction simulation weak effect in this and the actual field production process;

5. layer-by-layer distribution and layering are hit real thickness, are hit real back plucking and handle and hit real back specimen surface leveling processing meeting is hit the actual effect fruit, the test poor reproducibility because of the difference of testing crew influences;

6. surveying the air-dry water cut of gathering materials, sample from melting process divides three layers of pack into compaction cylinder and layering respectively to hit real 98 times, miscellaneous, the consuming time length of process operation of oven dry 8～12h measured moisture content.

2) there is following shortcoming in the static(al) compacting method for preparing test specimen:

1. hit real mode and static(al) compacting preparation method is not complementary;

2. static(al) compacting legal system is equipped with the condition that test specimen does not meet actual vibration roller-compaction (end) basic unit, and (end) base layer structure that the test specimen of preparation is formed structure and actual roller-compaction is not inconsistent;

3. the crushing coarse aggregates situation is comparatively serious in the test material preparation process, and (end) basic unit's grating of the test specimen grating of preparation and actual roller-compaction is not inconsistent;

4. the water cut damaed cordition is comparatively serious in the test material preparation process, and water cut loss causes the actual cement dosage reduction of test specimen, and (end) the basic unit's water cut and the cement dosage of this and on-the-spot actual roller-compaction are not inconsistent.

In sum, the compaction test method is because of hitting real mode, hitting real merit and concrete operations mode and there is bigger difference in actual production, causes that definite maximum dry density is less than normal, optimum moisture content is bigger than normal; Structure, grating, water cut, cement dosage, packing etc. misfit with the actual basic unit that rolls in the test material preparation process, the not representative and authenticity of the test specimen of preparation, and the physico-mechanical properties of test can not be represented basic unit's actual performance truly.

Summary of the invention

The objective of the invention is to, a kind of highway (end) base material cylindrical test material preparation method of simulated field rolling effect is provided, the sample dimensions of this method preparation is diameter 150mm * height 150mm, carries out (end) base material performance test for the laboratory and uses.It is easy and simple to handle, and the The performance test results of test specimen is reliable, favorable reproducibility.

In order to realize above-mentioned task, the present invention takes following technical solution:

A kind of highway of simulated field rolling effect (end) base material cylindrical test material preparation method is characterized in that, carries out according to following steps:

1) adopt the simulation research on vibrating compaction test method to determine maximum dry density ρ _DmaxWith optimum moisture content w _o

1. test portion is put and dried in the baking oven to constant weight, oven temperature is 105 ± 5 ℃, and the time is 4～6 hours;

2. get m _s1 part of oven dry test portion adds m _jInorganic binder, uniform mixing obtains dry mixture, and described inorganic binder is cement, lime, lime fly ash, cement, flyash or cement and lime flyash;

m _sValue should guarantee that preparing specimen height is controlled at 120 ± 10mm, and reference is as follows during the 1st test:

Test specimen is graded broken stone, graded gravel or calking rubble: m _s=5000 ± 200g;

Test specimen is cement stabilized soil: m _sAmong=5000 ± 200g or coarse-grained soil, or 4000 ± 200g fine grained soil;

Test specimen is lime stabilized soil: m _sAmong=4500 ± 200g or coarse-grained soil, or 3600 ± 200g fine grained soil;

Test specimen is cement and lime Stabilized Soil: m _sAmong=4500 ± 200g or coarse-grained soil, or 3600 ± 200g fine grained soil;

Test specimen is lime-fly-ash stabilization soil: m _sAmong=3500 ± 200g or coarse-grained soil, or 2100 ± 200g fine grained soil;

Test specimen is cement, flyash Stabilized Soil: m _sAmong=4500 ± 500g or coarse-grained soil, or 3500 ± 500g fine grained soil;

Test specimen is cement and lime flyash Stabilized Soil: m _sGrain soil or coarse-grained soil among=4000 ± 500g, or 3000 ± 500g fine grained soil;

The quality m that adds inorganic binder _jBe calculated as follows:

$m_j=\frac{m_s}{1-0.01\×P}\×0.01\×P$

In the formula, P is default inorganic binder dosage, %;

3. with quality (m _j+ m _s) * w _iWater add uniform mixing in the dry mixture prepare, obtain wet compound; Wherein, w _iBe to add in the i time when test to mix and stir PCm, i=1,2,3,4,5 in the dry mixture; Usually, w ₁Value is with reference to as follows:

Test specimen is graded broken stone, graded gravel and calking rubble: w ₁=4～5%;

Test specimen is cement stabilized soil: w ₁Grain soil or coarse-grained soil in=4～5%, or 9～10% fine grained soils;

Test specimen is lime stabilized soil: w ₁Grain soil or coarse-grained soil in=7～8%, or 15～16% fine grained soils;

Test specimen is cement and lime Stabilized Soil: w ₁Grain soil or coarse-grained soil in=4～5%, or 15～16% fine grained soils;

Test specimen is lime-fly-ash stabilization soil: w ₁Grain soil or coarse-grained soil in=8～9%, or 15～16% fine grained soils;

Test specimen is the cement, flyash Stabilized Soil; w ₁Grain soil or coarse-grained soil in=6～7%, or 13～14% fine grained soils;

Test specimen is a cement and lime flyash Stabilized Soil; w ₁Grain soil or coarse-grained soil in=8～9%, or 15～16% fine grained soils;

4. compression leg under the die trial of diameter 149mm, high 40mm is put into the die trial bottom and the bottom is flushed, the internal diameter 150mm * height 230 ± 10mm of described die trial gets the wet compound portion for preparing and packs in the die trial;

5. whole die trial is fixed on the vibration gauge base plate together with following compression leg, puts down Vib. and make vibration hammer and pressed material to contact vibration compaction test 100～120 seconds;

Vibration gauge parameter: vibration frequency 30 ± 2Hz, exciting force 7.6 ± 0.2kN, nominal amplitude 1.4 ± 0.2mm, service weight 3.0 ± 0.4kN, last truck system 1.2 ± 0.2kN, following truck system 1.8 ± 0.2kN;

6. the Vib. of slinging takes off die trial and is put on the stripper compound in the die trial is ejected, and is the test sample, specimen height is controlled at 120 ± 10mm, when specimen height exceeds this scope, should cancel, and look specimen height, suitably increase or reduce the m of step in 2. _s, according to 2. above-mentioned～6. step prepares sample again;

7. the sample dry density is calculated as follows:

${\mathrm{\ρ}}_{d\left(i\right)}=\frac{m_{2\left(i\right)}}{V_{\left(i\right)}}\·\frac{1}{1+0.01\·w_i}$

In the formula, ρ _{D (i)}The dry density of sample when being meant the i time test, m _{2 (i)}Sample mass when being the i time test, V _(i)Volume of sample when being the i time test, cm ³

8. calculate the wet compound m of poor quality in vibration compaction test front and back _{1 (i)}-m _{2 (i)}, the mix water cut w of adding compound when determining the i+1 time test _I+1(%); M wherein _{1 (i)}The i time test wet mixture quality in the die trial of the time packing into is worked as m _{1 (i)}-m _{2 (i)}＜50g, w _I+1=w _i+ 0.5%, work as m _{1 (i)}-m _{2 (i)}〉=50g, w _I+1=w _i-0.7%;

9. 2.～8. repeat 5～6 tests according to step, guarantee that 5 groups of specimen height are effective, calculate 5 groups and mix and stir water cut and dry density.To mix and stir water cut is that horizontal ordinate, dry density are ordinate, draws dry density one water cut relation curve, and the coordinate in length and breadth of hump shape hump is respectively maximum dry density ρ _DmaxWith optimum moisture content w _o

2) adopt vibratory drilling method to prepare the right cylinder test specimen

1. in predetermined the previous day of doing experiment, test portion to be put dry in the baking oven to constant weight, oven temperature is 105 ± 5 ℃, the time is 4～6 hours;

2. take by weighing dry test portion quality m that test specimen is required of preparation _d, wherein, m _d=ρ _Dmax* 2655 * (1-0.01 * P), ρ _DmaxBe the definite compound maximum dry density (g/cm of vibration compaction test ³), P is default inorganic binder dosage, %;

3. adding quality is ρ _DmaxThe inorganic binder of * 2655 * 0.01 * P is m to quality _dIn the dry test portion, mix evenly obtains dry mixture; Add quality ρ _Dmax* 2655 * 0.01 * w _oWater in dry mixture, mix evenly obtains wet compound, wherein, w _oBe the definite compound optimum moisture content (%) of vibration compaction test;

4. compression leg under the die trial of diameter 151mm, high 40mm is put into the die trial bottom and the bottom is flushed, the internal diameter 150mm * height 230 ± 10mm of described die trial, the compound that will wet pack in the die trial, the quality of charging=2650.72 * K ρ _Dmax(1+0.01w _o), wherein, K is the predetermined compactness (%) of test specimen, V=π * 7.5 * 7.5 * 15=2650.72cm ³Volume for test specimen;

The whole die trial that 5. wet compound will be housed is fixed on the vibration gauge base plate together with following compression leg, putting down Vib. makes vibration hammer be contacted with pressing material, the predetermined compactness K=97～98% o'clock vibration compaction test of test specimen 60～70 seconds, the predetermined compactness K=98～99% o'clock vibration compaction test of test specimen 70～80 seconds, predetermined compactness K=99～100% of test specimen o'clock, vibration compaction test 80～90 seconds;

Vibration gauge parameter: vibration frequency 30 ± 2Hz, exciting force 7.6 ± 0.2kN, nominal amplitude 1.4 ± 0.2mm, service weight 3.0 ± 0.4kN, last truck system 1.2 ± 0.2kN, following truck system 1.8 ± 0.2kN;

6. die trial is taken off, carefully release compound in the die trial, be the right cylinder test specimen with stripper.

Method operating process of the present invention conforms to on-the-spot practice of construction process, and the test specimen of maximum dry density of (end) base material of test and optimum moisture content, preparation and on-the-spot actual rolling effect coincide, the test result objective reality of test specimen performance, favorable reproducibility; And omitted steps such as surveying the air-dry water cut of gathering materials, sampling oven dry test specimens water cut, the processing of interlayer plucking and specimen surface leveling processing, simplified the charging process, improved work efficiency; The present invention is easy and simple to handle, reliable results, favorable reproducibility.

Description of drawings

Fig. 1 is graded broken stone mixture dry density-water cut curve;

Fig. 2 is 4% cement stabilized macadam compound dry density-water cut curve;

Fig. 3 is 25% lime-flyash stabilization macadam-aggregate mix dry density-water cut curve;

The present invention is described in further detail below in conjunction with drawings and Examples.

Embodiment

The present invention is applicable to graded broken stone, no binder class flexibility (end) base material and cement stabilized soils such as graded gravel and calking rubble, lime stabilized soil, the cement and lime Stabilized Soil, lime-fly-ash stabilization soil, stabilized with inorganic binder (end) base materials such as cement, flyash Stabilized Soil and cement and lime flyash Stabilized Soil, the title and the definition of related all kinds of stabilized with inorganic binder soil meets " highway road surface construction technique normalizing " regulation (JTJ034-2000), sample dimensions is diameter 150mm * height 150mm, carries out (end) base material performance test for the laboratory and uses.

Embodiment 1:

According to technical scheme of the present invention, highway (end) the base material cylindrical test material preparation method of the simulated field rolling effect of present embodiment, not add inorganic binder as an example, be that inorganic binder dosage is 0, the graded broken stone test specimen compactness 98% of preparation, its preparation method carries out according to following steps:

1) the simulation research on vibrating compaction test method is determined maximum dry density ρ _DmaxWith optimum moisture content w _o

1. will test used ls test portion and place baking oven, oven temperature is 105 ℃, and the time is 5 hours.

When 2. testing for the 1st time, get oven dry test portion m _s=5200g is tiled in uniform mixing in the metal dish, obtains dry mixture;

3. in the 1st when test, mix is moisture measures 4.0%, promptly add 5200 * 0.04=208g water be sprayed on the dry mixture uniformly and mix even, obtain wet compound.

4. compression leg under the die trial of diameter 149mm, high 40mm is put into the die trial bottom and the bottom is flushed, the internal diameter 150mm * height 230 ± 10mm of die trial gets the wet compound for preparing and packs in the die trial;

5. whole die trial (together with following compression leg) is fixed on the vibration gauge base plate, puts down Vib. and make vibration hammer and pressed material to contact vibration compaction test 100 seconds;

Vibration gauge parameter: vibration frequency 30Hz, exciting force 7.6kN, nominal amplitude 1.4mm, service weight 3.0kN, last truck system 1.2kN, following truck system 1.8kN.

6. the Vib. of slinging takes off die trial and is put on the stripper compound in the die trial is ejected, and is the test sample.With the vernier caliper measurement specimen height is 12.16cm, and specimen height meets the requirement of 120 ± 10mm.Weigh and obtain the quality m of sample _{2 (1)}=5378g.

7. the sample dry density is calculated as follows:

${\mathrm{\&rho;}}_{d\left(1\right)}=\frac{5378}{\mathrm{\&pi;}\&times;{7.5}^2\&times;12.16}\&CenterDot;\frac{1}{1+4.0\&times;0.01}=2.406g/{\mathrm{<figure-callout\; id="3"\; label="cm"\; filenames="H2009102190654E00012.png"\; state="\{\{state\}\}">cm</figure-callout>}}^3.$

8. the m of poor quality of compound before and after the vibration compaction test _{1 (1)}-m _{2 (1)}=22g, less than 50g, the amount of water w when therefore determining the 2nd test ₂Be 4.5%.

9. according to 2. above-mentioned～8. test method repeat 5 times the test, the results are shown in Table 1.

Table 1 cement stabilized macadam simulation research on vibrating compaction test result

Test sequence number i	1	2	3	4	5
						w i(％)	4.0	4.5	3.8	4.3	4.8

ρ d(i)(g/cm 3)

2.406

2.398

2.361

2.425

2.383

10. being horizontal ordinate with the water cut, is ordinate with the dry density, draws dry density-water cut curve, sees Fig. 1.As shown in Figure 1, the pairing dry density 2.425g/cm of peak of curve ³For maximum dry density, corresponding water cut 4.3% are optimum moisture content.

2) vibratory drilling method prepares test specimen

1. will test used ls test portion and place baking oven, oven temperature is 105 ℃, 5 hours time.Take by weighing dry test portion quality m that test specimen is required of preparation _d=2.425 * 2655 * (1-0.01 * 0)=6438g.

2. it is even test portion to be placed in the rectangle iron pan mix, adds 4.3% water cut, i.e. 2.425 * 26.55 * 0.01 * 4.3=277g water, and mix evenly obtains wet compound.

3. compression leg under the die trial of diameter 149mm, high 40mm is put into the die trial bottom and make the bottom flush the internal diameter 150mm * height 230mm of described die trial.Get the wet compound portion for preparing and pack in the die trial quality of charging=0.98 * 2.425 * 2650.72 * 1.043=6570g into.

The whole die trial (together with following compression leg) that 4. wet compound will be housed is fixed on the vibration gauge base plate, puts down Vib. and makes vibration hammer and pressed material to contact vibration compaction test 70 seconds.

Vibration gauge parameter: vibration frequency 30Hz, exciting force 7.6kN, nominal amplitude 1.4mm, service weight 3.0kN, last truck system 1.2kN, following truck system 1.8kN.

5. take off die trial,, be the right cylinder test specimen of preparation with the wet compound in the stripper release die trial.

Embodiment 2:

According to technical scheme of the present invention, highway (end) the base material cylindrical test material preparation method of the simulated field rolling effect of present embodiment, with the inorganic binder be cement as an example, cement dosage is 4%, the cement stabilized macadam test specimen compactness of preparation is 99%, and its preparation method carries out according to following steps:

1) the simulation research on vibrating compaction test method is determined maximum dry density ρ _DmaxWith optimum moisture content w _o

1. will test used andesite test portion and place baking oven, oven temperature is 105 ℃, and the time is 5 hours.

When 2. testing for the 1st time, get m _s1 part of=5000g oven dry test portion is tiled in the metal dish, and adds cement dosage 4.0%, and promptly cement consumption is $m_j=\frac{5000}{1-0.04}\&times;0.04=208g,$ Mix is even, obtains dry mixture.

3. in the 1st when test, getting the mix water cut is 4.2%, be about to (5000+208) * 0.01 * 4.2=219g water be sprayed on the compound uniformly and mix even, obtain wet compound.

4. compression leg under the die trial of diameter 151mm, high 40mm is put into the die trial bottom and the bottom is flushed, the internal diameter 150mm * height 230mm of die trial gets the wet compound for preparing and packs in the die trial; Claim to such an extent that die trial (together with following compression leg) quality is 15231g before the charging, be weighed as 20641g after the charging, deduct die trial (together with compression leg down) quality, calculate actual charging quality m _{1 (1)}=5410g.

5. whole die trial (together with following compression leg) is fixed on the vibration gauge base plate, puts down Vib. and make vibration hammer and pressed material to contact vibration compaction test 100 seconds;

The vibration gauge parameter is set to vibration frequency 30Hz, exciting force 7.6kN, nominal amplitude 1.4mm, service weight 3.0kN, last truck system 1.2kN, following truck system 1.8kN.

6. the Vib. of slinging takes off die trial and is put on the stripper compound in the die trial is ejected, and is test and uses sample, and weighing obtains m _{2 (1)}=5384g.Height with the vernier caliper measurement test specimen is 11.98cm, meets the requirement of 120 ± 10mm.

7. get the dry density of sample as calculated ${\mathrm{\&rho;}}_{d\left(1\right)}=\frac{5384}{\mathrm{\&pi;}\&times;{7.5}^2\&times;11.98}\&CenterDot;\frac{1}{1+0.01\&times;4.2}=2.441g/{\mathrm{<figure-callout\; id="3"\; label="cm"\; filenames="H2009102190654E00012.png"\; state="\{\{state\}\}">cm</figure-callout>}}^3.$

8. the m of poor quality of compound before and after the vibration compaction test _{1 (1)}-m _{2 (1)}=26g, less than 50g, the amount of water w when therefore determining the 2nd test ₂Be 4.7%.

9. according to 2. above-mentioned～8. test method repeat 5 times the test, the results are shown in Table 2.

Table 2 cement stabilized macadam simulation research on vibrating compaction test result

Test sequence number i	1	2	3	4	5
						w i(％)	4.2	4.7	4.0	4.5	5.0
ρ d(i)(g/cm 3)	2.441	2.437	2.432	2.444	2.432

10. being horizontal ordinate with the water cut, is ordinate with the dry density, draws dry density-water cut curve, sees Fig. 2.As shown in Figure 2, the pairing dry density 2.444g/cm of peak of curve ³For maximum dry density, corresponding water cut 4.5% are optimum moisture content.

2) vibratory drilling method prepares test specimen

1. will test used andesite test portion and place baking oven, oven temperature is 105 ℃, 5 hours time.

2. take by weighing quality m that test specimen is required of preparation _dThe dry test portion of=2.444 * 2655 * (1-0.01 * 4)=6230g is poured in the rectangle iron pan, and adds cement dosage 4%, i.e. 6230 * 0.01 * 4=260g cement, and mix is even, obtains dry mixture.Add 4.5% water cut again to dry mixture, i.e. m _w=2.444 * 2655 * 0.01 * 4.5=292g water, mix evenly obtain wet compound.

3. compression leg under the die trial of diameter 149mm, high 40mm is put into the die trial bottom and make the bottom flush the internal diameter 150mm * height 230mm of described die trial.Get the wet compound portion for preparing and pack in the die trial quality of charging=0.99 * 2.444 * 2650.72 * 1.045=6702g into.

The whole die trial (together with following compression leg) that 4. wet compound will be housed is fixed on the vibration gauge base plate, puts down Vib. and makes vibration hammer and pressed material to contact vibration compaction test 80 seconds.

The parameter of vibration gauge is set to vibration frequency 30Hz, exciting force 7.6kN, nominal amplitude 1.4mm, service weight 3.0kN, last truck system 1.2kN, following truck system 1.8kN.

5. take off die trial,, be the right cylinder test specimen of preparation with the wet compound in the stripper release die trial.

Embodiment 3:

According to technical scheme of the present invention, highway (end) the base material cylindrical test material preparation method of the simulated field rolling effect of present embodiment, with the inorganic binder is that lime fly ash (being called for short two ashes) is as example, two grey dosage are 25%, two grey stabilization gravel test specimen compactnesss of preparation are 97%, and its preparation method carries out according to following steps:

1) the simulation research on vibrating compaction test method is determined maximum dry density ρ _DmaxWith optimum moisture content w _o

1. will test used grouan test portion and place baking oven, oven temperature is 105 ℃, and the time is 5 hours.

When 2. testing for the 1st time, get m _s1 part of=4000g oven dry test portion is tiled in the metal dish, and adds lime fly ash 25%, and promptly the lime fly ash consumption is 1333g, and mix is even, obtains dry mixture.

3. in the 1st when test, getting the mix water cut is 9.0%, promptly add (4000+1333) * 0.01 * 9.0=480g water be sprayed on the dry mixture uniformly and mix even, obtain wet compound

4. compression leg under the die trial of diameter 151mm, high 40mm is put into the die trial bottom and the bottom is flushed, the internal diameter 150mm * height 230mm of die trial gets the wet compound for preparing and packs in the die trial; Claim to such an extent that die trial (together with following compression leg) quality is 15223g before the charging, be weighed as 20473g after the charging, deduct the die trial quality, calculate actual charging quality m _{1 (1)}=5250g.

5. whole die trial (together with following compression leg) is fixed on the vibration gauge base plate, puts down Vib. and make vibration hammer and pressed material to contact vibration compaction test 100 seconds;

The vibration gauge parameter is set to vibration frequency 30Hz, exciting force 7.6kN, nominal amplitude 1.4mm, service weight 3.0kN, last truck system 1.2kN, following truck system 1.8kN.

6. the Vib. of slinging takes off die trial and is put on the stripper compound in the die trial is ejected, and is test and uses sample, and weighing obtains m _{2 (1)}=5213g.Height with the vernier caliper measurement test specimen is 12.04cm, meets the requirement of 120 ± 10mm.

7. get the dry density of sample as calculated ${\mathrm{\&rho;}}_{d\left(1\right)}=\frac{5213}{\mathrm{\&pi;}\&times;{7.5}^2\&times;12.04}\&CenterDot;\frac{1}{1+0.01\&times;9.1}=2.248g/{\mathrm{<figure-callout\; id="3"\; label="cm"\; filenames="H2009102190654E00012.png"\; state="\{\{state\}\}">cm</figure-callout>}}^3.$

8. the m of poor quality of compound before and after the vibration compaction test _{1 (1)}-m _{2 (1)}=7g, less than 50g, the amount of water w when therefore determining the 2nd test ₂Be 9.5%.

9. according to 2. above-mentioned～8. test method repeat 5 times the test, the results are shown in Table 3.

Table 3 cement stabilized macadam simulation research on vibrating compaction test result

Test sequence number i	1	2	3	4	5
						w i(％)	9.0	9.5	8.8	9.3	9.8
ρ d(i)(g/cm 3)	2.248	2.259	2.231	2.263	2.251

10. being horizontal ordinate with the water cut, is ordinate with the dry density, draws dry density-water cut curve, sees Fig. 3.As shown in Figure 3, the pairing dry density 2.263g/cm of peak of curve ³For maximum dry density, corresponding water cut 9.3% are optimum moisture content.

2) vibratory drilling method prepares test specimen

1. will test used grouan test portion and place baking oven, oven temperature is 105 ℃, 5 hours time.

2. take by weighing required quality m of test specimen of preparation _dTest portion after the oven dry of=2.263 * 2655 * (1-0.01 * 25)=4506g is positioned in the rectangle iron pan, adds i.e. 2.263 * 2655 * 0.01 * 25=1502g lime fly ash of lime fly ash dosage 25%, and mix evenly obtains dry mixture; Adding quality to dry mixture again is 2.263 * 2655 * 0.01 * 9.1=547g water, makes water cut reach 9.1%, and mix evenly obtains wet compound.

8. compression leg under the die trial of diameter 149mm, high 40mm is put into the die trial bottom and make the bottom flush the internal diameter 150mm * height 230mm of described die trial.Get the wet compound portion for preparing and pack in the die trial quality of charging=0.97 * 2.263 * 2650.72 * 1.091=6348g into.

The whole die trial (together with following compression leg) that 4. wet compound will be housed is fixed on the vibration gauge base plate, puts down Vib. and makes vibration hammer and pressed material to contact vibration compaction test 65 seconds.

The parameter of vibration gauge is set to vibration frequency 30Hz, exciting force 7.6kN, nominal amplitude 1.4mm, service weight 3.0kN, last truck system 1.2kN, following truck system 1.8kN.

5. take off die trial,, be the right cylinder test specimen of preparation with the wet compound in the stripper release die trial.

The foregoing description has provided the object lesson that the two-ash broken stones test specimen of the cement stabilized macadam of graded broken stone, 4% caementum piezometric solidity 99% of 98% compactness of no binder and 25% lime fly ash dosage compactness 97% is made respectively, the invention is not restricted to the foregoing description.

Claims (1)

1. the method for preparing road base material cylindrical test piece of a simulated field rolling effect is characterized in that, carries out according to following steps:

1) adopt the simulation research on vibrating compaction test method to determine maximum dry density ρ _DmaxWith optimum moisture content w _o

1. test portion is put and dried in the baking oven to constant weight, oven temperature is 105 ± 5 ℃, and the time is 4～6 hours;

2. get m _s1 part of oven dry test portion adds m _jInorganic binder, uniform mixing obtains dry mixture, and described inorganic binder is cement, lime, lime fly ash, cement, flyash or cement and lime flyash;

m _sValue should guarantee that preparing specimen height is controlled at 120 ± 10mm, and reference is as follows during the 1st test:

Test specimen is graded broken stone, graded gravel or calking rubble: m _s=5000 ± 200g;

Test specimen is cement stabilized soil: m _sAmong=5000 ± 200g or coarse-grained soil, or 4000 ± 200g fine grained soil;

Test specimen is lime stabilized soil: m _sAmong=4500 ± 200g or coarse-grained soil, or 3600 ± 200g fine grained soil;

Test specimen is cement and lime Stabilized Soil: m _sAmong=4500 ± 200g or coarse-grained soil, or 3600 ± 200g fine grained soil;

Test specimen is lime-fly-ash stabilization soil: m _sAmong=3500 ± 200g or coarse-grained soil, or 2100 ± 200g fine grained soil;

Test specimen is cement, flyash Stabilized Soil: m _sAmong=4500 ± 500g or coarse-grained soil, or 3500 ± 500g fine grained soil;

Test specimen is cement and lime flyash Stabilized Soil: m _sGrain soil or coarse-grained soil among=4000 ± 500g, or 3000 ± 500g fine grained soil;

The quality m that adds inorganic binder _jBe calculated as follows:

$m_j=\frac{m_s}{1-0.01\&times;P}\&times;0.01\&times;P$

In the formula, P is default inorganic binder dosage, %;

3. with quality (m _j+ m _s) * w _iWater add uniform mixing in the dry mixture prepare, obtain wet compound; Wherein, w _iBe to add in the i time when test to mix and stir PCm, i=1,2,3,4,5 in the dry mixture; w ₁Value is with reference to as follows:

Test specimen is graded broken stone, graded gravel and calking rubble: w ₁=4～5%;

Test specimen is cement stabilized soil: w ₁Grain soil or coarse-grained soil in=4～5%, or 9～10% fine grained soils;

Test specimen is lime stabilized soil: w ₁Grain soil or coarse-grained soil in=7～8%, or 15～16% fine grained soils;

Test specimen is cement and lime Stabilized Soil: w ₁Grain soil or coarse-grained soil in=4～5%, or 15～16% fine grained soils;

Test specimen is lime-fly-ash stabilization soil: w ₁Grain soil or coarse-grained soil in=8～9%, or 15～16% fine grained soils;

Test specimen is the cement, flyash Stabilized Soil; w ₁Grain soil or coarse-grained soil in=6～7%, or 13～14% fine grained soils;

Test specimen is a cement and lime flyash Stabilized Soil; w ₁Grain soil or coarse-grained soil in=8～9%, or 15～16% fine grained soils;

4. compression leg under the die trial of diameter 149mm, high 40mm is put into the die trial bottom and the bottom is flushed, the internal diameter 150mm * height 230 ± 10mm of described die trial gets the wet compound portion for preparing and packs in the die trial;

5. whole die trial is fixed on the vibration gauge base plate together with following compression leg, puts down Vib. and make vibration hammer and pressed material to contact vibration compaction test 100～120 seconds;

Vibration gauge parameter: vibration frequency 30 ± 2Hz, exciting force 7.6 ± 0.2kN, nominal amplitude 1.4 ± 0.2mm, service weight 3.0 ± 0.4kN, last truck system 1.2 ± 0.2kN, following truck system 1.8 ± 0.2kN;

6. the Vib. of slinging takes off die trial and is put on the stripper compound in the die trial is ejected, and is the test sample, specimen height is controlled at 120 ± 10mm, when specimen height exceeds this scope, should cancel, and look specimen height, suitably increase or reduce the m of step in 2. _s, according to 2. above-mentioned～6. step prepares sample again;

7. the sample dry density is calculated as follows:

${\mathrm{\&rho;}}_{d\left(i\right)}=\frac{m_{2\left(i\right)}}{V_{\left(i\right)}}\&CenterDot;\frac{1}{1+0.01\&CenterDot;w_i}$

In the formula, ρ _{D (i)}The dry density of sample when being meant the i time test, m _{2 (i)}Sample mass when being the i time test, V _(i)Volume of sample when being the i time test, cm ³

8. calculate the wet compound m of poor quality in vibration compaction test front and back _{1 (i)}-m _{2 (i)}, the mix water cut w of adding compound when determining the i+1 time test _I+1(%); M wherein _{1 (i)}The i time test wet mixture quality in the die trial of the time packing into is worked as m _{1 (i)}-m _{2 (i)}＜50g, w _I+1=w _i+ 0.5%, work as m _{1 (i)}-m _{2 (i)}〉=50g, w _I+1=w _i-0.7%;

9. 2.～8. repeat 5～6 tests according to step, guarantee that 5 groups of specimen height are effective, calculate 5 groups and mix and stir water cut and dry density; To mix and stir water cut is that horizontal ordinate, dry density are ordinate, draws dry density-water cut relation curve, and the coordinate in length and breadth of hump shape hump is respectively maximum dry density ρ _DmaxWith optimum moisture content w _o

2) adopt vibratory drilling method to prepare the right cylinder test specimen

1. in predetermined the previous day of doing experiment, test portion to be put dry in the baking oven to constant weight, oven temperature is 105 ± 5 ℃, the time is 4～6 hours;

2. take by weighing dry test portion quality m that test specimen is required of preparation _d, wherein, m _d=ρ _Dmax* 2655 * (1-0.01 * P), ρ _DmaxBe the definite compound maximum dry density (g/cm of vibration compaction test ³), P is default inorganic binder dosage, %;

3. adding quality is ρ _DmaxThe inorganic binder of * 2655 * 0.01 * P is m to quality _dIn the dry test portion, mix evenly obtains dry mixture; Add quality ρ _Dmax* 2655 * 0.01 * w _oWater in dry mixture, mix evenly obtains wet compound, wherein, w _oBe the definite compound optimum moisture content (%) of vibration compaction test;

4. compression leg under the die trial of diameter 151mm, high 40mm is put into the die trial bottom and the bottom is flushed, the internal diameter 150mm * height 230 ± 10mm of described die trial, the compound that will wet pack in the die trial, the quality of charging=2650.72 * K ρ _Dmax(1+0.01w _o), wherein, K is the predetermined compactness (%) of test specimen, V=π * 7.5 * 7.5 * 15=2650.72cm ³Volume for test specimen;

The whole die trial that 5. wet compound will be housed is fixed on the vibration gauge base plate together with following compression leg, putting down Vib. makes vibration hammer be contacted with pressing material, the predetermined compactness K=97～98% o'clock vibration compaction test of test specimen 60～70 seconds, the predetermined compactness K=98～99% o'clock vibration compaction test of test specimen 70～80 seconds, predetermined compactness K=99～100% of test specimen o'clock, vibration compaction test 80～90 seconds;

Vibration gauge parameter: vibration frequency 30 ± 2Hz, exciting force 7.6 ± 0.2kN, nominal amplitude 1.4 ± 0.2mm, service weight 3.0 ± 0.4kN, last truck system 1.2 ± 0.2kN, following truck system 1.8 ± 0.2kN;

6. die trial is taken off, carefully release compound in the die trial, be the right cylinder test specimen with stripper.

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