CN105776925A - Grain graded screening method for roadbed fillers produced from construction waste - Google Patents
Grain graded screening method for roadbed fillers produced from construction waste Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a grain graded screening method for roadbed fillers produced from construction waste. Grain gradation adopts a screening test which comprises the following steps: (a) uniformly blending a sample, carrying out cutting-down by using a quartering method, and weighing a specified sample; and (b) sieving the sample by a sieve with the pore size of 2mm, weighing the mass of the sample on the sieve, and pouring the sample on the sieve into an upper sieve of multiple layers of sequentially-stacked coarse sieves for sieve analysis; and pouring the sample passing through the sieve with the pore size of 2mm into an upper sieve of multiple layers of sequentially-stacked fine sieves, and carrying out sieve analysis on a vibrating sieving machine. By the testing method used by the screening method, the aims of effectively utilizing the construction waste, reducing cost and protecting the environment are achieved; in addition, the fillers produced from the construction waste according to different mixing proportions can separately serve as an A-group filler, a B-group filler and a C-group filler of a railway bed and particularly are used as the A-group filler; and the applicable range is wide, the production process is simple and convenient, factory buildings are not required to be constructed, the cost is low, and the construction waste can be sufficiently utilized, so that the method is environment-friendly and practical.
Description
Technical field
The present invention relates to a kind of building waste and produce the method for sieving of roadbed filling grain composition, belong to environmental-friendly construction material technical field.
Background technology
At present, China is in the peak time of building construction, and annual new building high work area is more than the summation of the annual new building completed floor space of each developed country.China's town and country existing building gross area 40,000,000,000 square metres, it is contemplated that to the year two thousand twenty by newly-increased construction area about 30,000,000,000 square metres.The conventional processing method of China's building waste is that small part is recycled, and overwhelming majority building waste is just transported to countryside or rural area, air storage or landfill without any process.The processing mode of this building waste not only consumes the pork barrels such as substantial amounts of land acquisition expense, refuse collection expense, simultaneously, clear and the problem such as fly upward with dropping in stacking process, dust and sand-lime and cause serious environmental pollution, it is building waste stacking place meeting spoiled soil structure again, causes ground settlement, going down for a long time, it is serious that soil property is destroyed, and pole is not environmentally.
In recent years, some colleges and universities, scientific research institutions have carried out the research and development utilizing construction refuse regenerated technology, and have defined complete set technology, and construction refuse regenerated technology mainly includes regeneration aggregate technology, regenerative building block technology and recycled concrete.
Waste concrete block is utilized to manufacture regeneration aggregate, namely different disintegrating apparatus, screening plant, transmission equipment and Mix and dosing equipment are reasonably combined and discarded concrete is processed, waste concrete block exists the impurity such as reinforcing bar, wooden unit, plastic flakes, glass, plaster of Paris, for guaranteeing the quality of regeneration concrete, must take measures to remove these impurity.In general, method removes the impurity such as bulk reinforcing bar, wooden unit by hand；Irony impurity is removed by electromagnetic separation；Remove the light impurities such as water block wooden unit, plastics with gravitational separation process, it addition, regeneration aggregate is mainly used in roadbed filling, filler is required higher by highway subgrade, and therefore the scope of application of regeneration aggregate is narrow, can not be widely suitable in roadbed stuffing for expressway.
Utilizing building waste to manufacture regeneration aggregate, regenerative building block and regeneration concrete and all need to add appropriate additive and admixture, and need to build Factory Building, have high input, cost is high.
Summary of the invention
It is an object of the invention to: provide a kind of utilize building waste produce roadbed filling grain composition method for sieving, solve existing building rubbish can not by the technical problem of rational utilization, thus can effectively solve the problem that above-mentioned problems of the prior art.
The object of the invention is realized by following technical proposals: a kind of building waste produces the method for sieving of roadbed filling grain composition, and building waste produces roadbed filling and comprises the following steps:
The first step: concrete slag and brick slag mix in the ratio of 7 ~ 9:1, then passes through building waste metering type mixing crushing all-in-one machine and building waste is mixed and crushes, and after broken, the length of building waste is 15-45mm；
Second step: the material after broken is carried out grain composition, standard impact density, liquid plasticity, grain density, crush values, robustness, faller gill shape and Los Angeles Abrasion Test；
Wherein, described grain composition adopts sieve test, and its test procedure is as follows:
A. by sample uniform mixing, use quartering division, weigh regulation sample；
B. sample is crossed 2mm sieve, weighs the sample mass on sieve, upper for sieve sample is poured in the several layers of scalping upper sieve folded successively and carries out screen analysis；The sample sieved by 2mm is poured in the several layers of dusting cover upper sieve folded successively, be placed on vibrating sieving machine screen analysis.
As preferably, the step of described standard compaction test is as follows:
A. being pulverized by air-dried sample, select the sample differing 2% moisture content successively to prepare into 5 parts, single part of sample adds water after weighing 5.5kg to mix thoroughly and puts into plastic bag standing；
B., sample through above-mentioned steps divides three layers load compaction cylinder, often fills one layer and hit real 95-100 and hit, after having hit third layer, with the sample cutting soil cutter equating compaction cylinder top, weigh sample mass in compaction cylinder, measure sample moisture content；Try sample compacting to 5 parts successively and measure moisture content；
C. calculating the dry density that different water cut is corresponding: with dry density for vertical coordinate, moisture content is abscissa, draw the relation curve of dry density and moisture content, the coordinate in length and breadth of curve upward peak point represents that this hits the maximum dry density of real sample and optimum moisture content respectively.
As preferably, flat-elongated particles content test procedure is as follows:
A. sample, standby after drying or being air-dry；
B. weigh the portion of 40-50, then sieve by three class standards of flat-elongated particles content's index, be sieved into the sample of three parts of different-grain diameters；
C. three parts of samples are respectively with advising quasi-instrument by grain inspection, and all particle length advise corresponding spacing person on quasi-instrument more than needle-like, for elongated piece；Grain thickness advises respective aperture width person on quasi-instrument less than lamellar, for sheet-like particle；Weigh up the gross mass of elongated piece and the gross mass of sheet-like particle respectively；
Lip river shirt machine rate of wear test procedure is as follows:
A. portion sample is loaded in the abrasion machine cylinder of Los Angeles, load steel ball, build cover, open motor and cylinder is rotated；
B. cylinder is shut down after being rotated up to 1000r; pour out sample; sieve with the square hole screen of aperture 1.7mm; will be greater than the sample of 1.7mm and wash with water totally; load air dry oven; drying 4h at 105 DEG C of-110 DEG C of temperature, reuse the square hole screen screening of aperture 1.7mm, after weighed amount abrasion, particle diameter is more than the quality of 1.7mm granule.
As preferably, described grain density test procedure is as follows:
A. take the particle diameter sample 1000-1200g more than 5mm, after cleaning with clear water, be soaked in the water of 15-25 DEG C, take out after 24h, dry with wet towel, claim sample mass mb；
B. wire basket is immersed in the water, claims wire basket quality m in water1；
C. by claiming sample to put in wire basket, slowly it is immersed in water, claims wire basket and sample gross mass m in water2, and measure water temperature in water container；
D. the sample taken out in wire basket is put in porcelain dish, is placed in 105 DEG C of-110 DEG C of baking ovens and dries, and takes out and is cooled to room temperature, claims to dry sample mass md；
E. the formula ρ of grain density is brought intos=md/md-(m2-m1), calculate grain density.
As preferably, by the paving, roll and detecting by test section of the building waste after pass the test, detect qualified after as Subgrade Packing.
As preferably, being shakeout along test section ground by the building waste after pass the test, adopting 22T vibratory roller, speed per hour 2.3km/h carries out 6 times and rolls, and carries out compacting porosity detection, K30 detection and dynamic deformation modulus vd detection after rolling.
Compared with prior art, beneficial effects of the present invention: mixed by building waste metering type, building waste is carried out mixing and crushes by crushing all-in-one machine, and the material after broken is carried out grain composition, standard impact density, liquid plasticity, grain density, crush values, robustness, faller gill shape and Los Angeles Abrasion Test；Building waste carrying out match ratio allotment test building waste is tested as Subgrade Packing simultaneously, thus reaching building waste is effectively utilized, saving cost, the purpose of protection environment.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive speciality and/or step, all can combine by any way, unless specifically stated otherwise, all can by other equivalences or there is the alternative features of similar purpose replaced, namely, unless specifically stated otherwise, an embodiment in a series of equivalences of each feature or similar characteristics.
Embodiment
Method for testing and detecting is as follows:
The first step: broken: mixing crushing all-in-one machine by building waste metering type and building waste is mixed and crushes, after broken, building waste length is between 15-45mm, meets Subgrade Packing dimensional standard.
Second step: the material after broken is carried out grain composition, standard impact density, liquid plasticity, grain density, crush values, robustness, faller gill shape and Los Angeles Abrasion Test；
Grain composition:
1), grain composition test can measure each grain group dry ground quality in soil and account for the mass fraction of this soil gross mass, is also judge one of important indicators of filler such as soil A, B, C group.
Wherein: A group is high quality filler；B group is good filler.
A group filler includes sillar and coarse-grained soil；Wherein sillar blocked stone class and rubble class, coarse-grained soil sub-sand class and gravel class.Lump stone under block stone class and erratic boulder soil, the land pebble of rubble class and gravelly soil, gravel class round gravel soil and dust is native and the gravelly sand of sand class, rove and medium sand, these all can as A, B group filler；The difference of A, B group filler is at the content with fine grained soil, and fine grained soil is A group less than 15%, is B group between 15%-30%, is C group more than 30%.
2), sieve test:
A. by sample uniform mixing, use quartering division, weigh sample.
B. sample is crossed 2mm sieve, weigh sieve sample mass above or under sieve, upper for sieve sample is poured in the scalping the superiors sieve folded successively, carry out screen analysis, the sample sieved by 2mm is poured in the dusting cover the superiors sieve folded successively, be placed on vibrating sieving machine screen analysis, screen out the granule of different gradation, measure each grain group dry ground quality in soil and account for the mass fraction of this soil gross mass, it is determined that this group granule is as the type of filler.
2.2, standard impact density:
(1), compaction test can measure sample relation between moisture content and dry density under standard impact density merit effect, determine maximum dry density and the optimum moisture content of sample, also it is the important indicator of evaluation roadbed filling compaction quality control, maximum dry density value and Subgrade Compaction have and directly contact, and the result that the ratio of the dry density that job site placement grinding draws and maximum dry density draws is exactly compactness.According to " railway engineering earthwork test rule " TB10102-2010, " railway subgrade works construction quality accident standard " TB10414-2003, draw dry density and water content relation curve.
2), standard compaction test step:
A. being pulverized by air-dried sample, the moisture content in optimum moisture content difference 2% successively selected around prepares into 5 parts, and every part weighs 5.5kg, mixes thoroughly and put into plastic bag standing after adding water.
B., sample divides three layers load compaction cylinder, often fills one layer and hit real 98 and hit, after having hit third layer, with the sample cutting soil cutter equating compaction cylinder top, weigh sample mass in compaction cylinder, measure sample moisture content, successively 5 parts of different water cuts tried sample compacting and measure moisture content.
C. according to test data, calculate the dry density that different water cut is corresponding, with dry density for vertical coordinate, moisture content is abscissa, draw the relation curve of dry density and moisture content, wherein: the coordinate in length and breadth of curve upward peak point represents that this hits the maximum dry density of real sample and optimum moisture content respectively, i.e. maximum dry density is 2g/cm3, optimum moisture content is 11.5%.
Liquid plasticity
1), liquid plasticity test can measure the liquid limit of cohesive soil, plastic limit and shrinkage limit, liquidity index and plasticity index is calculated according to gained index, also it is fine grained soil filler packet important indicator, can be determined whether silt, cohesive soil and organoclay etc. according to plasticity index, liquid limit water content.Employing standard is " railway engineering earthwork test rule " TB10102-2010, " railway bed design specification " TB10001-2005.
2) liquid model limitation test step
A. the sample taking 0.5mm sieve is about 200g, is divided into 3 parts and loads in 3 Sheng soil wares, adds the pure water of varying number, cover with glass, stand 24h.
B. with adjusting soil cutter fully to mix well sample, floating sample cup for liquid, place it on Atterberg Limit analyzer elevating bracket, cone is coated with thin layer vaseline, switches on power, elevating bracket is slowly risen, after cone point contact sample, automatically fall off, read cone penetration, take 2, more than 10g sample and measure its moisture content.
C. repeat the above steps, tests cone penetration and the moisture content of all the other two samples.Test gained cone penetration and moisture content.
Grain density
1), grain density test can measure the indexs such as native grain density, the void ratio of calculating soil, porosity, saturation.In filling compacting process, job site test gained dry density can be regarded as out porosity with grain density index, and porosity index controls the important evaluating basis of compactness at railway compacting criteria specification middle coarse grained soil.Employing standard " railway engineering earthwork test rule " TB10102-2010, " railway subgrade works construction quality accident standard " TB10414-2003.
2) grain density test procedure
A. take the particle diameter aliquot part more than 5mm no less than 1000g, after cleaning with clear water, be soaked in 15-25oIn the water of C, take out after 24h, dry with wet towel, claim sample mass mb。
B. wire basket is immersed in the water, claims wire basket quality m in water1。
C. by claiming sample to put in wire basket, slowly it is immersed in water, claims wire basket and sample gross mass m in water2, and measure water temperature in water container.
D. the whole samples taken out in wire basket are put in porcelain dish, are placed in 105oC-110oC baking oven is dried, takes out and be cooled to room temperature, claim to dry sample mass md。
E. grain density formula: ρs=md/md-(m2-m1).
Crush values
1), crushing value test can record rubble matter granule content soft, broken.
2) crushing value test step
A. sample, screen out after air-dry more than 19.0mm and the granule less than 9.50mm, and remove pin, sheet-like particle, be divided into roughly equal three part standby.When the granule deficiency between 9.50mm to 19.0mm of the particle diameter in sample, it is allowed to become particle diameter granule between 9.50mm to 19.0mm to be used as crush index test the particle diameter grain breakage more than 19.0mm.
B. sample 3000g is weighed.Sample point two-layer being loaded in circle mould (being placed on chassis), after often installing one layer of sample, below chassis, pad puts the round steel that a diameter is 10mm, being pinned by cylinder, left and right replaces top and hits ground each 25 times, after two-layer top is real, specimen surface in smooth mould, covers pressure head.
C. the round mould equipped with sample is placed on pressure testing machine, starts pressure testing machine, by 1KN/s speed continuous load to 200KN steady lotus 5s, then off-load.Take off polishing head, pour out sample, screen out crushed particulate with the sieve of aperture 2.36mm, weigh up the sample mass staying on sieve.
Robustness
1), tough test is opposing breaking capacity (loss rate %) in metabisulfite solution soaks.
2), tough test step
A, sampling, and by sample divider pass to the quantity that can meet regulation, clean with water wash, it is placed in drying baker and dries to constant at 105 ± 5 DEG C, after being cooled to room temperature, screen out the granule less than 4.75mm, standby after being then carried out in accordance with regulations screening.
B, maximum particle diameter according to sample, weigh by specified quantity sample a, be accurate to 1g, the sample of different-grain diameter is respectively charged into basket, and immerses in the container filling metabisulfite solution, and the volume of solution should be not less than 5 times of sample population.When basket immerses solution, answer oscilaltion 25 times, to get rid of the bubble of sample, then being statically placed in this solution, basket bottom surface should be about 30mm apart from container bottoms, and the spacing of basket should be not less than 30mm, liquid level is at least above specimen surface 30mm, after solution temperature should be maintained at 20 DEG C-25 DEG C.
After c, immersion 20h, the basket of dress test is taken out from solution, be placed in drying baker and dry 4h in 105 DEG C ± 5 DEG C, so far, complete and circulate for the first time, after sample is cooled to 20 DEG C～25 DEG C, then carry out second time circulation as stated above.From second time circulation, soak and be 4h with drying time, altogether circulation 5 times.
After d, last circulation, till occurring without white opacity with the water a small amount of barium chloride solution of addition after the warm water drip washing sample of cleaning, washed sample is placed in drying baker and dries to constant at 105 DEG C ± 5 DEG C.After being cooled to room temperature, with the sieved sieve that aperture is sample lower size, weigh up the screen over-size after each grade specimen test, be accurate to 1g.
Faller gill shape
1), the test of flat-elongated particles content is the gross mass (%) that the rubble lamellar in detection rubble and needle-like account for granule.
2), flat-elongated particles content test procedure
A. sample, and sample divider pass is to slightly greater than the quantity of regulation, standby after drying or being air-dry.
B. the maximum particle diameter according to sample, weighs by the portion of specified quantity, is accurate to 1g.Then sieve by the grade of regulation.
C. by the grade of regulation respectively with advising quasi-instrument by grain inspection, all particle length advise corresponding spacing person on quasi-instrument more than needle-like, for elongated piece；Grain thickness advises respective aperture width person on quasi-instrument less than lamellar, for sheet-like particle.Weigh up its gross mass, be accurate to 1g.
D. the cobble-stone diameter rubble more than 37.5mm or cobble can check pin, sheet-like particle with slide calliper rule, and the setting width of slide calliper rule bayonet socket should meet regulation.
Faller gill Los Angeles wears away
1), rate of wear test in Los Angeles is the quality of detection graded broken stone, graded sand gravel, prescription should meet the ballast bed bottom ash pertinent regulations of railway, and " the ballast bed bottom ash of railway " the TB 2897-1998 regulation particle diameter Los Angeles rate of wear gathered materials more than 1.7mm is not more than 50%.
2) Lip river shirt machine rate of wear test procedure
A. portion sample is loaded in the abrasion machine cylinder of Los Angeles, load steel ball, build cover, open motor, be that cylinder rotates.
B. cylinder is rotated up to number of times (1000r) shutdown of regulation, pours out sample.Sieving with the square hole screen of aperture 1.7mm, will be greater than the sample of 1.7mm and wash with water totally, load air dry oven and dry, 105 DEG C～110 DEG C are dried 4h, again screen out the powder of below 1.7mm, and after weighed amount abrasion, particle diameter is more than the quality of 1.7mm granule.
The building waste of pass the test after broken is paved by test section, rolls and detects verify qualified after as Subgrade Packing.
Original ground processes: adopts 22T vibratory roller, speed per hour 2.3km/h, has carried out 6 times and rolled.Detect after rolling, according to specification " earthwork test rule " TB10102-2010 detection method, its compactness detection design regulation compactness 92%, actual measurement compactness peak 97.0%, minimum 95.4% meet " railway bed design specification " TB10001-2005 " railway subgrade works construction quality accident standard " TB10414-2003 code requirement.
Mix Ratio Test
1) selection of filler match ratio:To building slag and brick slag by proportioning, according to a definite proportion row allotment rational gradation composition curve, select reasonable A, B group filler at grading curve.
Specify according to " railway bed design specification " TB10001-2005: over coarse grained soil, coarse grained soil filler packet particle diameter exceedes the 50% of gross mass more than 20mm granule content, and fine particle content is less than 5%, and nonuniform coefficent Cu 5, curve coefficientCc=1～3, for A group filler.
According to broken concrete: the ratio of brick fragment=7:1, the compound having prepared 25.698kg sieves, build the 3% of slag maximum particle diameter 80mm according to the parameter of different ratio by 1#, 2# builds the 4% of slag particle footpath maximum particle diameter 60mm, 3# builds the 1% of slag maximum particle diameter 60, the 1% of 4# brick slag maximum particle diameter 60mm, 1% allotment of 5# brick slag maximum particle diameter 40mm, then through screen analysis test, the division of filler group is carried out according to soil particle size grading curve.
Nonuniform coefficent Cu=10.63 of compound, curve coefficientCc=2.81, grating is good, belongs to the thick dust that level prepares, meets the requirement of A group filler.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (6)
1. the method for sieving of a building waste production roadbed filling grain composition, it is characterised in that: building waste produces roadbed filling and comprises the following steps:
The first step: concrete slag and brick slag mix in the ratio of 7 ~ 9:1, then passes through building waste metering type mixing crushing all-in-one machine and building waste is mixed and crushes, and after broken, the length of building waste is 15-45mm；
Second step: the material after broken is carried out grain composition, standard impact density, liquid plasticity, grain density, crush values, robustness, faller gill shape and Los Angeles Abrasion Test；
Wherein, described grain composition adopts sieve test, and its test procedure is as follows:
A. by sample uniform mixing, use quartering division, weigh regulation sample；
B. sample is crossed 2mm sieve, weighs the sample mass on sieve, upper for sieve sample is poured in the several layers of scalping upper sieve folded successively and carries out screen analysis；The sample sieved by 2mm is poured in the several layers of dusting cover upper sieve folded successively, be placed on vibrating sieving machine screen analysis.
2. building waste as claimed in claim 1 produces the method for sieving of roadbed filling grain composition, it is characterised in that: flat-elongated particles content test procedure is as follows:
A. sample, standby after drying or being air-dry；
B. weigh the portion of 40-50, then sieve by three class standards of flat-elongated particles content's index, be sieved into the sample of three parts of different-grain diameters；
C. three parts of samples are respectively with advising quasi-instrument by grain inspection, and all particle length advise corresponding spacing person on quasi-instrument more than needle-like, for elongated piece；Grain thickness advises respective aperture width person on quasi-instrument less than lamellar, for sheet-like particle；Weigh up the gross mass of elongated piece and the gross mass of sheet-like particle respectively；
Lip river shirt machine rate of wear test procedure is as follows:
A. portion sample is loaded in the abrasion machine cylinder of Los Angeles, load steel ball, build cover, open motor and cylinder is rotated；
B. cylinder is shut down after being rotated up to 1000r; pour out sample; sieve with the square hole screen of aperture 1.7mm; will be greater than the sample of 1.7mm and wash with water totally; load air dry oven; drying 4h at 105 DEG C of-110 DEG C of temperature, reuse the square hole screen screening of aperture 1.7mm, after weighed amount abrasion, particle diameter is more than the quality of 1.7mm granule.
3. building waste as claimed in claim 1 produces the method for sieving of roadbed filling grain composition, it is characterised in that: the step of described standard compaction test is as follows:
A. being pulverized by air-dried sample, select the sample differing 2% moisture content successively to prepare into 5 parts, single part of sample adds water after weighing 5.5kg to mix thoroughly and puts into plastic bag standing；
B., sample through above-mentioned steps divides three layers load compaction cylinder, often fills one layer and hit real 95-100 and hit, after having hit third layer, with the sample cutting soil cutter equating compaction cylinder top, weigh sample mass in compaction cylinder, measure sample moisture content；Try sample compacting to 5 parts successively and measure moisture content；
C. calculating the dry density that different water cut is corresponding: with dry density for vertical coordinate, moisture content is abscissa, draw the relation curve of dry density and moisture content, the coordinate in length and breadth of curve upward peak point represents that this hits the maximum dry density of real sample and optimum moisture content respectively.
4. building waste as claimed in claim 1 produces the method for sieving of roadbed filling grain composition, it is characterised in that: described grain density test procedure is as follows:
A. take the particle diameter sample 1000-1200g more than 5mm, after cleaning with clear water, be soaked in the water of 15-25 DEG C, take out after 24h, dry with wet towel, claim sample mass mb；
B. wire basket is immersed in the water, claims wire basket quality m in water1；
C. by claiming sample to put in wire basket, slowly it is immersed in water, claims wire basket and sample gross mass m in water2, and measure water temperature in water container；
D. the sample taken out in wire basket is put in porcelain dish, is placed in 105 DEG C of-110 DEG C of baking ovens and dries, and takes out and is cooled to room temperature, claims to dry sample mass md；
E. the formula ρ of grain density is brought intos=md/md-(m2-m1), calculate grain density.
5. building waste as claimed in claim 1 produces the method for sieving of roadbed filling grain composition, it is characterised in that: by the paving, roll and detecting by test section of the building waste after pass the test, detect qualified after as Subgrade Packing.
6. building waste as claimed in claim 1 produces the method for sieving of roadbed filling grain composition, it is characterized in that: the building waste after pass the test is shakeout along test section ground, adopt 22T vibratory roller, speed per hour 2.3km/h carries out 6 times and rolls, and carries out compacting porosity detection, K30 detection and dynamic deformation modulus vd detection after rolling.
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| CN110411916A (en) * | 2019-08-01 | 2019-11-05 | 国网四川省电力公司 | A kind of grain composition test method of over coarse grained soil |
| CN112930741A (en) * | 2021-01-27 | 2021-06-11 | 广东省科学院生态环境与土壤研究所 | Method for improving non-expansive compact soil body through mechanical granulation |
| CN114662374A (en) * | 2022-03-21 | 2022-06-24 | 长安大学 | Method for identifying contour evolution characteristics of building rubbish roadbed filler particles in mechanical test |
| CN117705621A (en) * | 2024-02-06 | 2024-03-15 | 深圳市春旺新材料股份有限公司 | Hardness detection device of water-absorbing particulate matter |
| CN118395670A (en) * | 2024-03-19 | 2024-07-26 | 江苏镇江路桥工程有限公司 | Parting grading method and system for recycled concrete |
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