CN104965065A - Method for detecting gradation change of base-layer recycled materials on basis of static-pressure molding tests - Google Patents
Method for detecting gradation change of base-layer recycled materials on basis of static-pressure molding tests Download PDFInfo
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Abstract
The invention relates to a method for detecting gradation change of base-layer recycled materials on the basis of static-pressure molding tests. The method includes steps of carrying out screen tests on the base-layer recycled materials; proportioning the base-layer recycled materials according to match ratios of aggregate mixtures; uniformly filling standard test barrels with test samples of the mixtures in division order and separating the surfaces of the test samples from the top surfaces of the test barrels by distances of approximately 3cm; arranging the test barrels filled with the test samples on press machines and carrying out static-pressure tests at loading speeds of 1mm/min under the maximum pressures not higher than 200KN; carrying out screen tests on the aggregate test samples after the static-pressure tests are completed; computing evaluation indexes S of the gradation change of the recycled materials by the aid of formulas after the static-pressure tests are completed. The method has the advantages that the gradation change of the base-layer recycled materials in compaction procedures can be effectively evaluated by the aid of the test method, and accordingly favorable bases can be provided for designing and adjusting the gradation of the base-layer regenerated mixtures.
Description
Technical field
The invention belongs to field of road, be specifically related to a kind of basic unit's reclaimed materials gradation differentials detection method based on hydrostatic profile test.
Background technology
Along with the increase of Heavy Traffic and the growth of road base layer tenure of use, there is damage in various degree in highway in China basic unit, and by old base materials a large amount of for generation in road base layer maintenance and process of reconstruction.How these old base materials are carried out scientific and reasonable regeneration, become the important topic of China's old pavement regenerative use technology.
According to statistics, the high grade highway pavement basic unit of China more than 90% and subbase all adopt semi-rigid material, semi-rigid type base has become China Higher level Highway Main and has wanted substrate type, mainly comprise cracking performance of aggregate stabilized by cement class, lime-flyash stabilization gathers materials class, stable class and the lime stabilization of gathering materials of cement, flyash gather materials, be wherein most widely used with cracking performance of aggregate stabilized by cement class and lime-flyash stabilization class of gathering materials again.
At present, the main old substrate type of each standard highway of China comprises cracking performance of aggregate stabilized by cement class, lime-flyash stabilization gathers materials class, stable class and the lime stabilization of gathering materials of cement, flyash is gathered materials, and is wherein most widely used with cracking performance of aggregate stabilized by cement class and lime-flyash stabilization class of gathering materials again.Compared with gathering materials with natural mine, old basic unit gather materials form more complicated, wherein most old basic units surface of aggregate is attached with a large amount of mortar (cement class, cement and lime class and lime-flyash stabilized soil slurry, be referred to as " mortar "), but also wrap up in attached primary school's particle diameter by mortar to gather materials the Large stone mortar agglomerate formed containing a certain amount of, and these attachment mortar and mortar agglomerate can be able to occur to peel off under less Compaction Effort and defeated and dispersed, thus have influence on the true grating of basic unit's reclaimed materials.
The formate gradation composition of base mixture is the important indicator affecting base mixture key property, and the gradation design that the grating of basic unit's reclaimed materials changes directly having influence on basic unit's regenerating mixture, and then have influence on the performance of basic unit's regenerating mixture.Therefore, need a kind of simple to operate, laboratory experiment method that accuracy is higher can the gradation differentials of effectively evaluating basic unit regenerating mixture, for the gradation design of basic unit's regenerating mixture and adjustment provide favourable foundation.
Summary of the invention
The object of the present invention is to provide a kind of basic unit's reclaimed materials gradation differentials detection method based on hydrostatic profile test, the method has that test operation is simple, and test findings is accurately credible, the evaluation index mechanical meaning feature such as clearly.
The present invention adopts a kind of technical scheme of the basic unit's reclaimed materials gradation differentials detection method based on hydrostatic profile test to solve the problems referred to above, and concrete steps are as follows:
(1) by basic unit's reclaimed materials with newly gather materials and carry out size analysis respectively, obtain each shelves particle diameter and gather materials in order to using;
(2) according to packing volume and the tamping bulk density estimation compound initial weight of the compound that will obtain, according to Mixture Ratio, calculate Ge Dang basic unit reclaimed materials and the consumption that newly gathers materials, and prepare burden, mixed, obtained compound sample;
(3) in the hydrostatic profile testing standard examination cylinder being divided by compound sample 3 times (every sub-quantity is roughly the same) loading to connect lower cushion block, each with the even tamping of metal bar hemisphere face end 25 times, compound specimen surface is flattened;
(4) divide direction repetitive measurement compound specimen surface apart from standard examination cylinder end face distance with vernier caliper, average, make compound specimen surface apart from standard examination cylinder end face distance controlling at 3cm, within error ± 0.05cm;
(5) will install the standard examination cylinder of compound sample, together with upper lower cushion block, be put on pressing machine, pressurize with the loading speed of 1mm/min, until upper lower cushion block is all pressed into standard examination cylinder, maximum load pressure is no more than 200KN;
(6) take off standard examination cylinder after pressure relief, compound sample is ejected and puts into pallet, make it scatter as straight scraper in the rolling of compound specimen surface with metal bar;
(7) compound that step (6) obtains is carried out size analysis, and every grade of compound is weighed, calculate the grading curve after obtaining compound static pressure;
(8) according to formula
calculate, obtain the evaluation index S of sample gradation differentials, S is larger, and after representing aggregate mixture static pressure, gradation differentials is larger, otherwise then represents that gradation differentials is less.Wherein
kfor each shelves particle diameter numbering of compound,
ifor each shelves particle diameter total quantity,
p k be followed successively by 0.075mm, 0.6mm ... to maximum particle diameter of gathering materials by percent,
p'
k that gathers materials for same particle size after the static pressure that gathers materials passes through percent.
In the present invention, the compound specimen surface described in step (4), apart from when standard examination cylinder end face distance is not within 3cm ± 0.05cm, should adjusts compound sample mass, repeat step (3) and step (4), till meeting the demands.
In the present invention, when the maximum load pressure described in step (5) is more than 200KN, the quality of compound sample should be reduced, until maximum load pressure is less than 200KN.
Relevant regulations in the present invention, the tamping bulk density of the size analysis of gathering materials in step (1), (2), (3) and step (7), the packing volume of compound, compound, asphalt mixture design grating and testing standard examination cylinder selected should be followed " highway engineering gather materials testing regulations " (JTG E42-2005), " highway engineering stabilized with inorganic binder material test code " (JTG E51-2009), " bituminous pavement design for highway specification " (JTG D50-2006) and " highway road surface construction technique normalizing " (JTJ 034-2000).
In the static pressure test method that stabilized with inorganic binder material is conventional, the compound adopted is the wet feed after adding water and binder.But consider that basic unit's reclaimed materials contains mortar and mortar agglomerate, reclaimed materials easily condenses into block after meeting water under certain Compaction Effort, and thorough separation is still difficult to after washing, oven dry and screening, and easily cause aggregate quality loss etc., and then there is large impact to the measurement result of mixture gradation change.Therefore, what a kind of basic unit's reclaimed materials gradation differentials detection method based on hydrostatic profile test provided by the invention adopted is dry pressing, to ensure the accuracy of basic unit's reclaimed materials gradation differentials testing result.
In the present invention, for ensureing that compound in static pressure experimentation adds water the consistance of gradation differentials testing result of wet pressing and the dry-pressing that do not add water, test adopts the wet pressing result of meeting the water not easily water stability detritus compound (code name NA) of conglomeration, compare with the dry-pressing result under different tests condition, thus selected suitable test parameters, test findings is in table 1 and table 2.
The test parameters of table 1 water stability detritus compound hydrostatic profile
Gradation differentials before and after table 2 water stability detritus compound static pressure
As shown in Table 1, compared with wetpressing, adopt the loss of the water stability detritus mixture quality of dry pressing less, thus the measurement result deviation caused is less; As shown in Table 2, end face distance is that the measurement result of the dry pressing gradation differentials result of compound NA-1800 of 3.0cm and the compound NA-1920 of maximum pressure and employing wetpressing is comparatively close, as can be seen here, selection 3.0cm is that the dry pressing of end face command range better can simulate the conventional static pressure test process of stabilized with inorganic binder material, i.e. wet pressing process.
A kind of basic unit's reclaimed materials gradation differentials detection method based on hydrostatic profile test provided by the invention, has the following advantages:
1, this detection method data processing is simple, and test operation is convenient, does not need to purchase new equipment in addition, is conducive to application and the popularization of this detection method.
2, this detection method has fully taken into account the material behavior of basic unit's reclaimed materials, adopts dry pressing to replace wetpressing, improves the accuracy of measurement result.
3, this detection method determines Basic Controlling Conditions and the parameter of test, better can simulate the static pressure test process (i.e. wet pressing process) that stabilized with inorganic binder material is conventional, improve the validity of measurement result.
Accompanying drawing explanation
Fig. 1 is water stability detritus compound dry pressing provided by the invention and wetpressing comparison of test results schematic diagram;
Fig. 2 is the embodiment test findings schematic diagram of application a kind of basic unit's reclaimed materials gradation differentials detection method based on hydrostatic profile test provided by the invention.
Embodiment
The present invention is further illustrated by reference to the accompanying drawings below by embodiment.
Embodiment 1
In order to a kind of basic unit's reclaimed materials gradation differentials detection method based on hydrostatic profile test clearly provided by the invention, now typically test in conjunction with one and be illustrated, experiment process figure is shown in Fig. 2.
What test reclaimed materials employing in embodiment 1 is lime fly ash crushed rock base course reclaimed materials (i.e. lime-fly ash aggregate base reclaimed materials), and what newly gather materials employing is that limestone zone gathers materials.Compound replaces the difference of particle diameter and consumption according to reclaimed materials, have employed 3 kinds of replacement modes; Separately, design 1 group of compound, whole employing is newly gathered materials, as a comparison compound.
(1) compound all uses reclaimed materials, and replacement particle diameter is 0 ~ 31.5mm, and reclaimed materials consumption is 100%, code name RA;
(2) coarse aggregate in compound all uses the coarse fodder in reclaimed materials, and replacement particle diameter is 4.75 ~ 31.5mm, and reclaimed materials consumption is 60%, code name RCA;
(3) fine aggregate in compound all uses the fines in reclaimed materials, and replacement particle diameter is 0 ~ 4.75mm, and reclaimed materials consumption is 40%, code name RFA.
(4) compound all uses and newly gathers materials, code name NA.
The concrete steps of embodiment 1 are as follows:
(1) prepare material: by lime-fly ash aggregate base reclaimed materials with newly gather materials and carry out size analysis, obtain each shelves particle diameter and gather materials, aggregate size stepping is identical with asphalt mixture design grating, as shown in table 3.
The design grating of table 3 compound
(2) compound is configured: according to packing volume and the stamped density estimation mixture quality of compound, calculate Ge Dang basic unit reclaimed materials and the consumption that newly gathers materials according to asphalt mixture design grating, and prepare burden, mixed.
(3) load compound: test adopt static pressure test standard examination cylinder be diameter × height=
Φ100mm × 180mm, cushion block be diameter × height=
Φ100mm × 40mm.3 times (every sub-quantity is roughly the same) is divided by compound sample evenly to load in standard examination cylinder (together with lower cushion block) of hydrostatic profile test, each with the even tamping of metal bar hemisphere face end 25 times, specimen surface is flattened; Then, divide direction repetitive measurement specimen surface apart from examination cylinder end face distance with vernier caliper, average, make end face distance controlling at 3cm ± 0.05cm, when end face distance is not within the scope of this, adjustment mixture quality, again load, until end face distance is 3cm ± 0.05cm.
(4) static pressure test: the examination cylinder (together with upper lower cushion block) installing compound is put on pressing machine, pressurizes with the loading speed of 1mm/min, until upper lower cushion block is all pressed into examination cylinder, maximum load pressure does not exceed 200KN; Then, pressure relief, takes off examination cylinder, is ejected by sample and puts into pallet, makes it scatter with metal bar as straight scraper in specimen surface rolling;
(5) data processing: the compound sample that step (4) obtains is carried out size analysis, and every grade is gathered materials weigh, obtain the grading curve after compound sample static pressure, according to formula S=calculating, obtain the evaluation index S of sample gradation differentials, as shown in table 4.
Gradation differentials before and after table 4 compound static pressure
(6) interpretation of result: as shown in Table 4, the change that be there occurs degree varies by percent after compound static pressure that each shelves particle diameter of compound gathers materials, and gradation differentials cumulative percent S can be effective, quantitative evaluation compound formate gradation composition change, S value is larger, then the gradation differentials representing compound is larger.Reclaimed materials is relevant with consumption with the replacement mode of compound on the impact of mixture gradation, wherein comparatively close by the gradation differentials degree of the RFA compound and ls compound NA that reclaim fines replacement, but along with reclaimed materials replaces the increase of particle diameter and the increase of reclaimed materials consumption, reclaimed materials constantly increases mixture gradation influence degree, and wherein RCA compound and the change of RA mixture gradation are about 1.96 times and 2.27 times of NA compound.
Claims (4)
1., based on basic unit's reclaimed materials gradation differentials detection method of hydrostatic profile test, it is characterized in that concrete steps are as follows:
(1) by basic unit's reclaimed materials with newly gather materials and carry out size analysis respectively, obtain each shelves particle diameter and gather materials in order to using;
(2) according to packing volume and the tamping bulk density estimation compound initial weight of the compound that will obtain, according to Mixture Ratio, calculate Ge Dang basic unit reclaimed materials and the consumption that newly gathers materials, and prepare burden, mixed, obtained compound sample;
(3) in the hydrostatic profile testing standard examination cylinder being divided by compound sample 3 times (every sub-quantity is roughly the same) loading to connect lower cushion block, each with the even tamping of metal bar hemisphere face end 25 times, compound specimen surface is flattened;
(4) divide direction repetitive measurement compound specimen surface apart from standard examination cylinder end face distance with vernier caliper, average, make compound specimen surface apart from standard examination cylinder end face distance controlling at 3cm, within error ± 0.05cm;
(5) will install the standard examination cylinder of compound sample, together with upper lower cushion block, be put on pressing machine, pressurize with the loading speed of 1mm/min, until upper lower cushion block is all pressed into standard examination cylinder, maximum load pressure is no more than 200KN;
(6) take off standard examination cylinder after pressure relief, compound sample is ejected and puts into pallet, make it scatter as straight scraper in the rolling of compound specimen surface with metal bar;
(7) compound that step (6) obtains is carried out size analysis, and every grade of compound is weighed, calculate the grading curve after obtaining compound static pressure;
(8) according to formula
calculate, obtain the evaluation index S of sample gradation differentials, S is larger, and after representing aggregate mixture static pressure, gradation differentials is larger, otherwise then represents that gradation differentials is less; Wherein
kfor each shelves particle diameter numbering of compound,
ifor each shelves particle diameter total quantity,
p k be followed successively by 0.075mm, 0.6mm ... to maximum particle diameter of gathering materials by percent,
p'
k that gathers materials for same particle size after the static pressure that gathers materials passes through percent.
2. method according to claim 1, it is characterized in that when the compound specimen surface described in step (4) is apart from when standard examination cylinder end face distance is not within 3cm ± 0.05cm, compound sample mass should be adjusted, repeat step (3) and step (4), till meeting the demands.
3. method according to claim 1, when it is characterized in that the maximum load pressure described in step (5) more than 200KN, should reduce the quality of compound sample, until maximum load pressure is less than 200KN.
4. method according to claim 1, it is characterized in that step (1), (2), (3) size analysis of gathering materials and in step (7), the packing volume of compound, the tamping bulk density of compound, asphalt mixture design grating and testing standard examination cylinder selected should be followed " highway engineering gather materials testing regulations " (JTG E42-2005), " highway engineering stabilized with inorganic binder material test code " (JTG E51-2009), relevant regulations in " bituminous pavement design for highway specification " (JTG D50-2006) and " highway road surface construction technique normalizing " (JTJ 034-2000).
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