CN104931385A - Method for measuring density and water absorption of regenerated coarse aggregate - Google Patents

Method for measuring density and water absorption of regenerated coarse aggregate Download PDF

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Publication number
CN104931385A
CN104931385A CN201510255673.6A CN201510255673A CN104931385A CN 104931385 A CN104931385 A CN 104931385A CN 201510255673 A CN201510255673 A CN 201510255673A CN 104931385 A CN104931385 A CN 104931385A
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water
tray
described sample
drying
absorbent material
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Inventor
陈宇亮
吴超凡
钟梦武
朱沅峰
张继森
吴开
彭红卫
谌博
姚胜
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HUNAN COMMUNICATIONS RESEARCH INSTITUTE
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HUNAN COMMUNICATIONS RESEARCH INSTITUTE
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Abstract

The invention provides a method for measuring density and water absorption of regenerated coarse aggregates. The method comprises the steps of taking and containing a test sample in a tray, drying the test sample and the tray in a drying oven and weighing the mass m0 of the dried test sample and tray; moving the test sample into a hanging basket, controlling the height of water in an overflow water tank through the overflow hole of the water tank, and weighting the mass mw of the test sample in the water; taking and placing a water-absorbent material into the tray, drying the test sample to constant weight, cooling the test sample, weighing mass mm0, wetting the water-absorbent material, wringing the water-absorbent material and then flatly spreading the water-absorbent material in the tray; directly pouring the test sample into the wringed water-absorbent material in the tray to suck away free water leaking from the test sample; under a surface dry state, weighing the surface dry mass mf of the test sample; putting the test sample in the tray for drying, taking out the tray, cooling the tray to room temperature and weighing the dry mass ma of the test piece; drying the water-absorbent material after wiping and the tray to constant weight, cooling and weighing mass mm1. The measuring method provided by the invention has the advantages that the actual density and overall stability of the regenerated aggregates can be reflected, the measuring method and calculation formula of mass loss are provided, and the mass loss of the regenerated coarse aggregates during density and water absorption measurement is quantitatively analyzed on the basis.

Description

The density of recycled coarse aggregate and the measuring method of water-intake rate
Technical field
The present invention relates to a kind of density of recycled coarse aggregate and the measuring method of water-intake rate.
Background technology
In asphalt, coarse aggregate refers to that particle diameter is greater than the rubble of more than 2.36mm, crushing gravel, graded gravel and slag etc.; In cement concrete, coarse aggregate refers to that particle diameter is greater than rubble gravel and the crushing gravel of more than 4.75mm.
China's " highway engineering gather materials testing regulations " (JTG E42-2005) T0304 test method is for the common density and moisture content test method formulated of gathering materials, for recycled coarse aggregate, test according to T0304, the density drawn and water-intake rate are all bigger than normal, if the density water-intake rate in this, as recycled coarse aggregate carries out the material coordination in works design of cement concrete or cement stabilized type, appreciable impact can be caused on construction quality.
Specify in T0304 test method, oven dry standard in coarse aggregate density and the moisture content test is " drying to constant weight ", this is out of question for common coarse aggregate, but for recycled coarse aggregate, this oven dry standard cannot be implemented at short notice, because in regular hour scope (24 hours), the dries quantity of different drying time recycled coarse aggregates is different.
In addition, in recycled coarse aggregate density and moisture content test process, 24 hours need be soaked in water, then with the wet towel wrung out, the moisture of particle surface be wiped dry gently.Because rough sets material intensity is high, good integrity, this process can not cause the mass loss of coarse aggregate substantially, but for recycled coarse aggregate, immersion, with wiping process, all exists sand-cement slurry fine particle break-off in various degree.
Summary of the invention
In order to solve problems of the prior art, the invention provides a kind of density of recycled coarse aggregate and the measuring method of water-intake rate, comprise: materials and load in tray, described sample is dried more than 24 hours in an oven together with described tray, takes the described sample of oven dry and the quality m of tray 0; The described sample of drying is loaded in container, injects water, at room temperature keep immersion 24 hours; Hung over by hanging basket on the suspension hook of balance, immerse in overflow tank, water filling in overflow tank, balance, to the spout hole of tank, returns to zero by water surface elevation; Regulate water temperature within the scope of 15 DEG C ~ 25 DEG C, moved into by described sample in described hanging basket, the water surface elevation in described overflow tank is controlled by the spout hole of tank, remains unchanged, and takes quality m in the water of described sample w; Get absorbent material to put into tray and dry to constant weight, after cooling, take quality m m0, then described absorbent material is soaked, wring out after shakeout in described tray; Hang indigo plant described in mentioning, described sample is directly poured on the described absorbent material wrung out in described tray, to siphon away the free water spilt from described sample, dries the surface water of the aggregate particle in described sample afterwards with the described absorbent material wrung out; Under maintenance dry face state, take the surface drying quality m of described sample f; Described sample is positioned in tray and dries, take out described tray, be placed in container with cover and be cooled to room temperature, take the dries quantity m of described sample a; And the absorbent material after wiping is dried to constant weight together with tray, take quality m after cooling m1.
In above-mentioned measuring method, materialsing in the step in loading tray, comprise further: make described sample shakeout to ensure that gathering materials in described sample does not pile up in described tray, and described oven dry implemented by the baking oven that serviceability temperature is 105 DEG C ± 5 DEG C.
In above-mentioned measuring method, the described sample of drying is loaded in the step of container, comprises further: inject clean water, the water surface at least should exceed described sample 20mm, stirs described sample, and the bubble be attached on described sample is overflowed completely.
In above-mentioned measuring method, the screen cloth of described hanging basket should ensure that described sample can not be run off by sieve aperture.
In above-mentioned measuring method, put into tray and dry step to constant weight getting absorbent material, in the baking oven of 105 DEG C ± 5 DEG C, implement described oven dry.
In above-mentioned measuring method, hanging in blue step described in mentioning, granule must not be had to be attached on hanging basket, in the operation of surface water of drying the aggregate particle in described sample, by the water sucking-off of the aggregate particle inside in described sample, and whole process of drying can not be carried out to ensure that the aggregate particle in described sample can not be scattered in outside tray above tray while wiping surface water.
In above-mentioned measuring method, described sample side is being placed in step that tray dries and the absorbent material after wiping is dried step to constant weight together with tray, in the baking oven of 105 DEG C ± 5 DEG C, is implementing described oven dry.
In above-mentioned measuring method, use formula γ a = m a + ( m m 1 - m m 0 ) m a + ( m m 1 - m m 0 ) - m w , γ s = m f + ( m m 1 - m m 0 ) m f + ( m m 1 - m m 0 ) - m w With calculate the apparent relative density γ of described sample respectively a, surface drying relative density γ s, bulk specific gravity γ b.
In above-mentioned measuring method, use formula calculate the water-intake rate w of the described sample of described sample x.
In above-mentioned measuring method, use formula ρ a=γ a× ρ tor ρ a=(γ a-α t) × ρ Ω, ρ s=γ s× ρ tor ρ s=(γ s-α t) × ρ Ωand ρ b=γ b× ρ tor ρ b=(γ b-α t) × ρ Ωcalculate the apparent density ρ of described sample respectively a, surface drying density p s, bulk density ρ b, wherein, ρ tthe density of water when being temperature T, α twater temperature modifying coefficient when being temperature T, ρ Ωthe density of water 4 DEG C time.
In above-mentioned measuring method, after drying more than 24 hours by described sample in an oven together with described tray, weigh the quality m of described tray 1, and use formula calculate the mass loss rate of described sample.
Measuring method provided by the invention is no less than 24 hours by being decided to be by drying time, reduces the loss of recycled coarse aggregate sand-cement slurry internal crystallization water to the impact of measurement result.In addition, measuring method provided by the invention can reflect recycled coarse aggregate real density and resistance to overturning, propose measuring method and the computing formula of mass loss, and on this basis quantitative test is carried out to the mass loss of recycled coarse aggregate in density and water-intake rate measuring process.
This method is applicable to the apparent relative density, surface drying relative density, bulk specific gravity, apparent density, surface drying density, the bulk density that measure various recycled coarse aggregate, and the water-intake rate of recycled coarse aggregate.Recycled coarse aggregate derives from the coarse aggregate of Old cement concrete surface layer, semi-rigid (end) basic unit and building concrete gained after processing fragmentation.
Embodiment
Be clearly and completely described to the technical scheme in the embodiment of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of protection of the invention.
The density of embodiment 1 recycled coarse aggregate and the measuring method of water-intake rate
instrument tool and material:
(1) balance or immersion balance: can measure quality in the water gathered materials by hanging basket, weighing should meet sample quantities and weigh requirement, and sensibility reciprocal is not more than 0.05% of maximum capacity.
(2) hanging basket: corrosion resistant material is made, diameter and highly be about 150mm, the screen cloth of surrounding and bottom 1mm ~ 2mm is worked out or has intensive eyelet.
(3) overflow tank: water surface elevation can be kept certain when weighing quality in water.
(4) baking oven: energy temperature control is at 105 DEG C ± 5 DEG C.
(5) towel: textile system, clean, also can replace with textile undershirt cloth.
(6) thermometer.
(7) standard sieve.
(8) water container (as enamel tray).
test prepares:
1. sieve sample standard sieve removing fine aggregate wherein, can use the sieved sieve of 4.75mm to thicker recycled coarse aggregate, with inquartation or the division of tripper method to the quality required, divide two parts for subsequent use.
2. after division, the regulation of table 1 should be met for the recycled coarse aggregate quality measuring density and water-intake rate.
Table 1 measures the sample minimum mass required for density
Nominal maximum particle diameter (mm) 4.75 9.5 16 19 26.5 31.5 37.5 63 75
The minimum mass (kg) of every a sample 0.8 1 1 1 1.5 1.5 2 3 3
3. every a recycled coarse aggregate sample is immersed in water, and suitably stirs, carefully wash away the dust and stone flour that are attached to surface of aggregate, through repeatedly rinsed clean to water is completely limpid.Do not scatter and disappear in cleaning process aggregate particle as far as possible.
test procedure:
1. materials and a load in tray and to shakeout, ensureing gathers materials does not pile up, and sample being no less than 24 hours together with tray as drying in the baking oven of 105 DEG C ± 5 DEG C, taking the quality (m of drying recycled coarse aggregate 0).In this step, being no less than 24 hours by being decided to be by drying time, the loss of recycled coarse aggregate sand-cement slurry internal crystallization water can being reduced as much as possible on the impact of test.
2. the recycled coarse aggregate of drying is loaded in clean enamel tray, inject clean water, the water surface at least should exceed sample 20mm, stirs building stones gently, and the bubble be attached on building stones is overflowed completely.At room temperature keep immersion 24 hours.
3. hang on the suspension hook of balance by hanging basket, immerse in overflow tank, water filling in overflow tank, water surface elevation is to the spout hole of tank, and returned to zero by balance, the screen cloth of hanging basket should be ensured to gather materials and can not be run off by sieve aperture.
4. regulate water temperature within the scope of 15 DEG C ~ 25 DEG C.Sample is moved in hanging basket.Water surface elevation in overflow tank is controlled by the spout hole of tank, remain unchanged take recycled coarse aggregate water in quality (m w).
5. get some clean towels needed for test or tray put into by textile undershirt cloth, place and dry to constant weight in the baking oven with 105 DEG C ± 5 DEG C, after cooling, take quality (m m0), then towel is soaked, wring out after shakeout in tray.
6. mention and hang indigo plant, after dripping slightly, recycled coarse aggregate is directly poured on the wet towel wrung out in tray, siphons away the free water spilt from gather materials with towel.This step need must not pay special attention to has granule to be attached on hanging basket.Dry the surface water of recycled coarse aggregate particle again with the wet towel wrung out gently, can't see shinny water mark to surface, be saturated dry surface.When recycled coarse aggregate size is larger, should by dry, note thicker coarse aggregate, do not put forth one's strength very much when twisting wet towel, prevent from twisting too dry, when wiping the surface water of particle, surface water should be wiped, again must not by the water sucking-off of granule interior, must not gather materials of having dried continues to place in atmosphere, to prevent drying of gathering materials.The whole process of drying must ensure to carry out above tray, and ensures that aggregate particle can not be scattered in outside tray, is placed in tray after wet tissue wiping.
7., immediately under maintenance dry face state, take the surface drying matter (m of recycled coarse aggregate f).
8. will gather materials and be placed in tray, the baking oven oven dry of putting into 105 DEG C ± 5 DEG C is no less than 24 hours.Take out tray, be placed in container with cover and be cooled to room temperature, take the dries quantity (m gathered materials a).
9. by the towel after wiping together with tray, the baking oven putting into 105 DEG C ± 5 DEG C is dried to constant weight, takes quality (m after cooling m1).
calculate:
1. apparent relative density γ a, surface drying relative density γ s, bulk specific gravity γ b3 are calculated to after radix point by formula (1), formula (2), formula (3).
γ a = m a + ( m m 1 - m m 0 ) m a + ( m m 1 - m m 0 ) - m w - - - ( 1 )
γ s = m f + ( m m 1 - m m 0 ) m f + ( m m 1 - m m 0 ) - m w - - - ( 2 )
γ b = m a + ( m m 1 - m m 0 ) m f + ( m m 1 - m m 0 ) - m w - - - ( 3 )
In formula: γ a---the apparent relative density of recycled coarse aggregate, dimensionless;
γ s---the surface drying relative density of recycled coarse aggregate, dimensionless;
γ b---the bulk specific gravity of recycled coarse aggregate, dimensionless;
M a---the dries quantity (g) of recycled coarse aggregate;
M f---surface drying quality (g) of recycled coarse aggregate;
M ω---quality (g) in the water of recycled coarse aggregate;
M m0---the dries quantity of clean towel and tray;
M m1---the dries quantity of towel and tray after recycled coarse aggregate wiping.
2. the water-intake rate gathered materials, to dry sample for benchmark, calculates by formula (4), is accurate to 0.01%.
w x = m f - m a m a + ( m m 1 - m m 0 ) × 100 - - - ( 4 )
In formula: w x---regenerate the water-intake rate (%) gathered materials roughly.
3. apparent density (pseudodensity) ρ of recycled coarse aggregate a, surface drying density p s, bulk density ρ b, calculate by formula (5), formula (6), formula (7), accurately to radix point 3.The coarse aggregate apparent density measured under different water temperature condition need carry out water temperature correction, the density p of water at different tests temperature tand the temperature correction coefficient α of water tselect by Appendix B.
ρ a=γ a× ρ tor ρ a=(γ a-α t) × ρ Ω(5)
ρ s=γ s× ρ tor ρ s=(γ s-α t) × ρ Ω(6)
ρ b=γ b× ρ tor ρ b=(γ b-α t) × ρ Ω(7)
In formula: ρ a---the apparent density (g/cm of recycled coarse aggregate 3);
ρ s---the surface drying density (g/cm of recycled coarse aggregate 3);
ρ b---the bulk density (g/cm of recycled coarse aggregate 3);
ρ t---the density (g/cm of water during test temperature T 3), take by " highway engineering gather materials testing regulations " (JTG E42-2005) Appendix B table B-1;
α t---water temperature correction factor during test temperature T;
ρ Ω---the density (1.000g/cm of water 4 DEG C time 3).
Mass loss rate calculates by formula (8), is accurate to 0.1%.
P = m 0 - m a m 0 - m 1 × 100 - - - ( 8 )
In formula: P---the mass loss rate (%) of recycled coarse aggregate;
M 0---first time dries sample and tray gross mass (g);
M 1---recycled coarse aggregate dries the quality (g) of tray used.
test findings:
Parallel experiment twice is answered to the recycled coarse aggregate of same specification, averages as test findings.
Test method provided by the invention is no less than 24 hours by being decided to be by drying time, reduces the loss of recycled coarse aggregate sand-cement slurry internal crystallization water to the impact of test.In addition, test method provided by the invention can reflect recycled coarse aggregate real density and resistance to overturning, propose test method and the computing formula of mass loss, and on this basis quantitative test is carried out to the mass loss of recycled coarse aggregate in density and moisture content test process.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. the density of recycled coarse aggregate and a measuring method for water-intake rate, comprising:
Materials and load in tray, described sample is dried more than 24 hours in an oven together with described tray, takes the described sample of oven dry and the quality m of tray 0;
The described sample of drying is loaded in container, injects water, at room temperature keep immersion 24 hours;
Hung over by hanging basket on the suspension hook of balance, immerse in overflow tank, water filling in overflow tank, balance, to the spout hole of tank, returns to zero by water surface elevation;
Regulate water temperature within the scope of 15 DEG C ~ 25 DEG C, moved into by described sample in described hanging basket, the water surface elevation in described overflow tank is controlled by the spout hole of tank, remains unchanged, and takes quality m in the water of described sample w;
Get absorbent material to put into tray and dry to constant weight, after cooling, take quality m m0, then described absorbent material is soaked, wring out after shakeout in described tray;
Hang indigo plant described in mentioning, described sample is directly poured on the described absorbent material wrung out in described tray, to siphon away the free water spilt from described sample, dries the surface water of the aggregate particle in described sample afterwards with the described absorbent material wrung out;
Under maintenance dry face state, take the surface drying quality m of described sample f;
Described sample is positioned in tray and dries, take out described tray, be placed in container with cover and be cooled to room temperature, take the dries quantity m of described sample a; And
Absorbent material after wiping is dried to constant weight together with tray, after cooling, takes quality m m1.
2. measuring method according to claim 1, it is characterized in that, materialsing in the step in loading tray, comprise further: make described sample shakeout to ensure that gathering materials in described sample does not pile up in described tray, and described oven dry implemented by the baking oven that serviceability temperature is 105 DEG C ± 5 DEG C.
3. measuring method according to claim 1, is characterized in that, the described sample of drying is loaded in the step of container, comprise further: inject clean water, the water surface at least should exceed described sample 20mm, stirs described sample, and the bubble be attached on described sample is overflowed completely.
4. measuring method according to claim 1, is characterized in that, the screen cloth of described hanging basket should ensure that described sample can not be run off by sieve aperture.
5. measuring method according to claim 1, it is characterized in that, hanging in blue step described in mentioning, granule must not be had to be attached on hanging basket, in the operation of surface water of drying the aggregate particle in described sample, by the water sucking-off of the aggregate particle inside in described sample, and whole process of drying can not be carried out to ensure that the aggregate particle in described sample can not be scattered in outside tray above tray while wiping surface water.
6. measuring method according to claim 1, it is characterized in that, put into tray and dry step to constant weight getting absorbent material, being positioned over by described sample in the step of drying in tray and being dried in the step of constant weight together with tray by the absorbent material after wiping, in the baking oven of 105 DEG C ± 5 DEG C, implement described oven dry.
7. measuring method according to claim 1, is characterized in that, uses formula γ a = m a + ( m 1 - m m 0 ) m a + ( m m 1 - m m 0 ) - m w , γ s = m f + ( m m 1 - m m 0 ) m f + ( m m 1 - m m 0 ) - m w With γ b = m a + ( m m 1 - m m 0 ) m f + ( m m 1 - m m 0 ) - m w Calculate the apparent relative density γ of described sample respectively a, surface drying relative density γ s, bulk specific gravity γ b.
8. measuring method according to claim 1, is characterized in that, uses formula calculate the water-intake rate w of the described sample of described sample x.
9. measuring method according to claim 1, is characterized in that, uses formula ρ a=γ a× ρ tor ρ a=(γ a-α t) × ρ Ω, ρ s=γ s× ρ tor ρ s=(γ s-α t) × ρ Ωand ρ b=γ b× ρ tor ρ b=(γ b-α t) × ρ Ωcalculate the apparent density ρ of described sample respectively a, surface drying density p s, bulk density ρ b, wherein, ρ tthe density of water when being temperature T, α twater temperature modifying coefficient when being temperature T, ρ Ωthe density of water 4 DEG C time.
10. measuring method according to claim 1, also comprises:
After drying more than 24 hours by described sample in an oven together with described tray, weigh the quality m of described tray 1, and use formula calculate the mass loss rate of described sample.
CN201510255673.6A 2015-05-19 2015-05-19 Method for measuring density and water absorption of regenerated coarse aggregate Pending CN104931385A (en)

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CN105588778A (en) * 2016-03-16 2016-05-18 哈尔滨工程大学 Concrete water absorption experimental device
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CN109557431A (en) * 2018-11-19 2019-04-02 国网北京市电力公司 A kind of immersion measurement method based on XLPE cable insulation tabletting sample
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CN112525759A (en) * 2020-11-23 2021-03-19 中建商品混凝土有限公司 Device and method for rapidly testing pressure water absorption ratio of lightweight aggregate
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CN113310846A (en) * 2021-04-19 2021-08-27 武汉钢铁有限公司 Device and method for detecting density of scrap steel briquettes
CN113670762A (en) * 2021-08-26 2021-11-19 深圳市卓宝科技股份有限公司 Method for testing water absorption of tire body after dipping
CN114166682A (en) * 2021-12-06 2022-03-11 南方电网科学研究院有限责任公司 Method for measuring water absorption of insulating material

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CN105004630A (en) * 2015-06-10 2015-10-28 国家电网公司 Method for measuring power grid icing volume density and porosity
CN105588778A (en) * 2016-03-16 2016-05-18 哈尔滨工程大学 Concrete water absorption experimental device
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CN106840943B (en) * 2016-08-28 2019-05-24 华北水利水电大学 A kind of device and test method detecting construction refuse regenerated aggregate water absorption character
CN106840943A (en) * 2016-08-28 2017-06-13 郑州赛斯工业技术转化研究院有限公司 A kind of device and test method for detecting construction refuse regenerated aggregate water absorption character
CN106769614B (en) * 2017-01-22 2019-05-17 长安大学 A kind of experimental rig and method for assessing surface of aggregate asphalt membrane block-water performance
CN106769614A (en) * 2017-01-22 2017-05-31 长安大学 A kind of experimental rig and method for assessing surface of aggregate asphalt membrane block-water performance
CN108152164A (en) * 2017-11-23 2018-06-12 北京建筑大学 It is a kind of about waste and old lime, the fast appraisement method of flyash stabilization gravel water absorption rate
CN109142132A (en) * 2018-10-30 2019-01-04 西安公路研究院 A kind of aggregate storage coefficient test device and its test method
CN109557431A (en) * 2018-11-19 2019-04-02 国网北京市电力公司 A kind of immersion measurement method based on XLPE cable insulation tabletting sample
CN112067472A (en) * 2020-07-22 2020-12-11 四川科路泰交通科技有限公司 Coarse aggregate durability test method
CN112525759B (en) * 2020-11-23 2022-07-15 中建商品混凝土有限公司 Device and method for rapidly testing pressure water absorption ratio of lightweight aggregate
CN112525759A (en) * 2020-11-23 2021-03-19 中建商品混凝土有限公司 Device and method for rapidly testing pressure water absorption ratio of lightweight aggregate
CN112697635A (en) * 2021-03-25 2021-04-23 北京新桥技术发展有限公司 Method and system for testing water absorption of regenerated coarse aggregate
CN112697635B (en) * 2021-03-25 2021-09-10 北京新桥技术发展有限公司 Method and system for testing water absorption of regenerated coarse aggregate
CN113310846A (en) * 2021-04-19 2021-08-27 武汉钢铁有限公司 Device and method for detecting density of scrap steel briquettes
CN113670762A (en) * 2021-08-26 2021-11-19 深圳市卓宝科技股份有限公司 Method for testing water absorption of tire body after dipping
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Application publication date: 20150923