CN104502227A - Method for measuring fiber density - Google Patents
Method for measuring fiber density Download PDFInfo
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- CN104502227A CN104502227A CN201410802704.0A CN201410802704A CN104502227A CN 104502227 A CN104502227 A CN 104502227A CN 201410802704 A CN201410802704 A CN 201410802704A CN 104502227 A CN104502227 A CN 104502227A
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Abstract
The invention relates to the field of fiber density detection and in particular discloses a method for measuring fiber density. A volumetric flask serves as a measuring container, kerosene serves as a measuring medium, and the fiber density is detected by utilizing an Archimedes principle. The measurement method disclosed by the invention is easy to operate, high in measurement result accuracy and low in cost and is suitable for fiber density measurement of various occasions such as labs and engineering fields.
Description
Technical field
The present invention relates to the field that fibre density detects, specifically disclose a kind of assay method of fibre density.
Background technology
In bituminous concrete, use fiber, existing two more than ten years history, must use fiber stabilizer when producing stone mastic asphalt (SMA), the most frequently used is lignin fibre at present, comprises cotton-shaped and graininess two type.The effect of fiber in SMA have following in: 1) fiber in compound with a kind of disperse phase of three-dimensional exist, can reinforced action be played; 2) fiber can make asphalite arogel roll into a ball suitably dispersion, prevents road surface from occurring bellding phenomenon; 3) fiber fully can absorb pitch, reduces free pitch, asphalt content is increased, and improves asphalt membrane thickness, improves the permanance of compound; 4) fiber is equably in dispersed bitumens compound, improves pitch and adhesion between gathering materials, makes asphalt membrane be in more stable state, significantly improve high-temperature stability.Density is the important parameter characterizing polymeric fibrous material physical property, and its size depends on himself component composition, internal microstructure and morphosis.The internal crystallization degree of different fiber is different, and fibre density is also different, therefore, the mensuration of fibre density can provide the information such as uniformity coefficient, material category of fiber, providing reference for evaluating the quality of fiber, for fibre identification provides foundation, for the performance of fiber and structure, there is practical significance.Fiber is the indispensable ingredient of SMA mixture, and " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) specifies, when calculating the maximum theoretical relative density of SMA mixture, the ratio of pars fibrosa must not be ignored.The maximal phase of compound directly affects the most important volume index voidage of compound to solid density, under the same terms, if the maximal phase calculated is larger than actual value to solid density, then the voidage of compound is bigger than normal than actual value, the appearance of the diseases such as road surface bellding, passing may be caused, have a strong impact on Pavement Condition.The consumption of fiber and density directly affect the result of calculation of compound maximal phase to solid density, and this just means that fibre density is the key factor affecting SMA mixture volume index and pavement performance.The consumption of fiber is just determined when SMA mixture mix-design, but how to measure for the density of the lignin fibre used in asphalt and there is no final conclusion.
Conventional fibre density assay method mainly contains four kinds, is respectively pycnometer method, liquid displacement technique, density gradient method and generator volume method.Pycnometer method requires low to fiber samples, soaks deoil without the need to ether, and operating process is relatively simple, and accuracy requirement is higher; Liquid displacement technique is simple and easy to do, and measured value is comparatively stable, is applicable to long run test in enormous quantities, but whether bubble is de-will produce considerable influence to test findings to the greatest extent; Density gradient method is suitable for natural fiber and the less synthon of some density and man-made fiber, and accuracy is higher, but complex operation step, linear good, the rational density gradient column of density range of more difficult preparation.Generator volume method method is simple, and test error is little, and precision is high, is applicable to follow-on test in enormous quantities, but instrument and equipment fund input is large, and testing cost is higher.
In above-mentioned several method, current application assay method that is more, comparatively maturation is pycnometer method, it designs according to Archimedes principle: be placed in by sample in the pycnometer of certain volume, after adding media fluid, the gas that sample adsorbs is got rid of by ebuillition of heated and/or the mode that vacuumizes, calculate the volume of sample according to the quality of the liquid measured and the densitometer of liquid, thus calculate the density of sample.In " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004), suggestion adopts pycnometer method to measure the density of lignin fibre, but does not propose to adopt which kind of liquid medium and concrete test method.With reference to existing data, what pycnometer method adopted usually is volume is the pycnometer of 50ml, and sample quality is 0.5-1.0g, and accuracy of balance is 1mg, and liquid medium adopts distilled water usually.The shortcoming of this method is: (1) sample volume often occupies a big chunk volume of pycnometer, causes adding of distilled water limited, affects the abundant immersion of fiber.(2) distilled water is difficult to complete wetting fiber, and more fiber suspension, on distilled water, affects the accurate of liquid level readings.(3) sample quality owing to adopting is little, and test operation process must strictly control, and is proposed high requirement to experimental enviroment, instrument and equipment and operating personnel.
Summary of the invention
For problems of the prior art, the object of this invention is to provide a kind of assay method of fibre density, it is simple to operate, accuracy is high, cost is low.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
An assay method for fibre density, is characterized in that, comprises the following steps:
Step one, gets cleaning, dry volumetric flask, takes volumetric flask quality, be designated as m
1.
Step 2, gets fiber, takes fiber quality, is designated as m
2; Fiber is put into volumetric flask, then inject kerosene in volumetric flask, until kerosene liquid level is close to the master scale line of volumetric flask; After fiber soaks in kerosene, volumetric flask is placed in 25 DEG C of waters bath with thermostatic control and is incubated, then get rid of the bubble in fiber, then with dropper add kerosene until the concave of kerosene liquid level and the master scale line of volumetric flask concordant; Dry volumetric flask outer wall moisture, take volumetric flask quality, be designated as m
3.
Step 3, pours out the fiber in volumetric flask and kerosene, and volumetric flask internal washing is clean, dries volumetric flask outside, and volumetric flask is dried to constant weight; In volumetric flask, inject kerosene until kerosene liquid level is close to the master scale line of volumetric flask, then volumetric flask be placed in 25 DEG C of waters bath with thermostatic control and be incubated, then add kerosene with dropper until the concave of kerosene liquid level and the master scale line of volumetric flask concordant; Dry volumetric flask outer wall moisture, take volumetric flask quality, be designated as m
4.
Step 4, pours out the kerosene in volumetric flask, and volumetric flask internal washing is clean, dries volumetric flask outside, and volumetric flask is dried to constant weight; In volumetric flask, inject distilled water until distilled water liquid level is close to the master scale line of volumetric flask, then volumetric flask be placed in 25 DEG C of waters bath with thermostatic control and be incubated, then add distilled water with dropper until the concave of distilled water liquid level and the master scale line of volumetric flask concordant; Dry volumetric flask outer wall moisture, take volumetric flask quality, be designated as m
5.
Step 5, calculates the relative density γ of kerosene by formula (1)
m,
Step 6, calculates the relative density γ of fiber by formula (2)
x:
Obtain the density of fiber.
Preferably, the time that fiber described in step 2 fully soaks in kerosene is more than or equal to 16 hours.
Preferably, the time be incubated in arbitrary described 25 DEG C of waters bath with thermostatic control among step 2 to four is more than or equal to 1 hour.
Preferably, the bubble got rid of described in step 2 in fiber adopts manual exclusive method or ultrasonic vibration method.
Preferably, the assay method of described fibre density is used for the mensuration of lignin fibre density.
Compared with prior art, the present invention has the following advantages and useful technique effect:
(1) medium is suitable for.Present invention employs kerosene as medium, kerosene density is little, and volatilization is slow, and can complete wetting lignin fibre quickly, and optimum is used as the mensuration of fibre density.
(2) measure accurately and reliably, operation is simple.Present invention utilizes Archimedes principle, the basis of pycnometer method optimizes operation steps, make the result of test more accurate; Use the volumetric flask of large volume to can be used for measuring the fiber samples of larger quality, test result is accurate stable more simultaneously; Also taken into full account the impact of temperature, soak time, removal of bubbles, make the control errors of parallel experiment being less than or equal in 0.02 scope, stability is far above pycnometer method.
(3) cost is low.Volumetric flask is common indispensable container, easily obtains, and adopts assay method of the present invention need not buy pycnometer in addition, cost-saving, convenient and swift.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further details, but the invention is not restricted to these embodiments.
Select the lignin fibre of A, B two kinds of different manufacturers, adopt assay method of the present invention and pycnometer to measure respectively.
Adopt the assay method of fibre density of the present invention to measure the density of A, B two kinds of lignin fibres respectively, specifically comprise the following steps:
Step one, gets cleaning, dry volumetric flask, takes volumetric flask quality, be designated as m
1.
Step 2, gets A or B lignin fibre, takes fiber quality, be designated as m
2; Fiber is put into volumetric flask, then inject kerosene in volumetric flask, until kerosene liquid level is close to the scale mark of volumetric flask; After fiber soaks 16 hours in kerosene, then volumetric flask is placed in 25 DEG C of waters bath with thermostatic control and is incubated 1h, manually fully rock the bubble got rid of in fiber, then add kerosene with dropper until the concave of kerosene liquid level and the master scale line of volumetric flask concordant; Dry volumetric flask outer wall moisture, take volumetric flask quality, be designated as m
3.
Step 3, pours out the lignin fibre in volumetric flask and kerosene, and volumetric flask internal washing is clean, dries volumetric flask outside, and volumetric flask is dried to constant weight; In volumetric flask, inject kerosene until kerosene liquid level is close to the scale mark of volumetric flask, then volumetric flask be placed in 25 DEG C of waters bath with thermostatic control and be incubated 1h, then add kerosene with dropper until the concave of kerosene liquid level and the master scale line of volumetric flask concordant; Dry volumetric flask outer wall moisture, take volumetric flask quality, be designated as m
4.
Step 4, pours out the kerosene in volumetric flask, and volumetric flask internal washing is clean, dries volumetric flask outside, and volumetric flask is dried to constant weight; In volumetric flask, inject distilled water until distilled water liquid level is close to the scale mark of volumetric flask, then volumetric flask be placed in 25 DEG C of waters bath with thermostatic control and be incubated 1h, then add distilled water with dropper until the concave of distilled water liquid level and the master scale line of volumetric flask concordant; Dry volumetric flask outer wall moisture, take volumetric flask quality, be designated as m
5.
Step 5, calculates the relative density γ of kerosene by formula (1)
m:
Step 6, calculates the relative density γ of lignin fibre by formula (2)
x:
Wherein, getting rid of bubble also can adopt ultrasonic vibration method to adopt Ultrasound Instrument to get rid of bubble.
In order to ensure the accuracy of measurement result, A, B two kinds of lignin fibres respectively carry out two groups of parallel experiments.
Utilize pycnometer method, do medium with distilled water, measure the density of A, B two kinds of lignin fibres, equally respectively carry out two groups of parallel experiments.
Experimental result is in table 1.
Table 1 lignin fibre Density measurements
From the test findings in table 1, the difference of two groups of parallel experiments that sample A volumetric flask method records is 0.01, and the difference of pycnometer method records two groups of parallel experiments is 0.12; The difference of two groups of parallel experiments that sample B volumetric flask method records is 0.02, and the difference of pycnometer method records two groups of parallel experiments is 0.13, and as seen with in battery of tests, the degree of accuracy of volumetric flask method is higher.Occur that the main cause of this result is: (1) kerosene do Media Ratio water do medium can make more fully fiber soak and sedimentation, measurement result is more accurate; (2) pycnometer of to be volume be 50ml that adopts of pycnometer method, fiber sample quality is about 1.0g, because the sample quality adopted is little, measures and easily occurs error; In addition, due to pycnometer limited volume, about 1.0g fiber has occupied most of space, fully rocks and is also difficult to get rid of the air in fiber, also have impact on the precision of test.Therefore, assay method of the present invention is simple to operate, accuracy is high, and the fibre density being applicable to the multiple occasion such as laboratory, engineering site measures.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.
Claims (5)
1. an assay method for fibre density, is characterized in that, comprises the following steps:
Step one, gets cleaning, dry volumetric flask, takes volumetric flask quality, be designated as m
1;
Step 2, gets fiber, takes fiber quality, is designated as m
2; Fiber is put into volumetric flask, then inject kerosene in volumetric flask, until kerosene liquid level is close to the master scale line of volumetric flask; After fiber soaks in kerosene, volumetric flask is placed in 25 DEG C of waters bath with thermostatic control and is incubated, then get rid of the bubble in fiber, then with dropper add kerosene until the concave of kerosene liquid level and the master scale line of volumetric flask concordant; Dry volumetric flask outer wall moisture, take volumetric flask quality, be designated as m
3;
Step 3, pours out the fiber in volumetric flask and kerosene, and volumetric flask internal washing is clean, dries volumetric flask outside, and volumetric flask is dried to constant weight; In volumetric flask, inject kerosene until kerosene liquid level is close to the master scale line of volumetric flask, then volumetric flask be placed in 25 DEG C of waters bath with thermostatic control and be incubated, then add kerosene with dropper until the concave of kerosene liquid level and the master scale line of volumetric flask concordant; Dry volumetric flask outer wall moisture, take volumetric flask quality, be designated as m
4;
Step 4, pours out the kerosene in volumetric flask, and volumetric flask internal washing is clean, dries volumetric flask outside, and volumetric flask is dried to constant weight; In volumetric flask, inject distilled water until distilled water liquid level is close to the master scale line of volumetric flask, then volumetric flask be placed in 25 DEG C of waters bath with thermostatic control and be incubated, then add distilled water with dropper until the concave of distilled water liquid level and the master scale line of volumetric flask concordant; Dry volumetric flask outer wall moisture, take volumetric flask quality, be designated as m
5;
Step 5, calculates the relative density γ of kerosene by formula (1)
m,
Step 6, calculates the relative density γ of fiber by formula (2)
x,
Obtain the density of fiber.
2. the assay method of fibre density according to claim 1, is characterized in that, the time that fiber described in step 2 soaks in kerosene is more than or equal to 16 hours.
3. the assay method of fibre density according to claim 1, is characterized in that, the time be incubated in arbitrary described 25 DEG C of waters bath with thermostatic control among step 2 to four is more than or equal to 1 hour.
4. the assay method of fibre density according to claim 1, is characterized in that, the bubble got rid of described in step 2 in fiber adopts manual exclusive method or ultrasonic vibration method.
5. the assay method of fibre density according to claim 1, is characterized in that, the assay method of described fibre density is used for the mensuration of lignin fibre density.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842109A (en) * | 2016-03-29 | 2016-08-10 | 绍兴文理学院元培学院 | Novel two-component textile fiber component ratio test method |
| CN105842115A (en) * | 2016-03-29 | 2016-08-10 | 绍兴文理学院元培学院 | Novel textile fiber density test method |
| CN106153497A (en) * | 2016-09-09 | 2016-11-23 | 天津工业大学 | A kind of cellulose fibre density measurement method |
| CN107290252A (en) * | 2017-06-30 | 2017-10-24 | 浙江石金玄武岩纤维股份有限公司 | A kind of method for testing fiber wetness energy |
| CN110118705A (en) * | 2019-04-18 | 2019-08-13 | 山东益大新材料有限公司 | A kind of measuring method improving measurement needle coke real density repeatability |
-
2014
- 2014-12-19 CN CN201410802704.0A patent/CN104502227A/en active Pending
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| 史永刚: "《仪器分析实验技术》", 29 February 2012 * |
| 周超梅等: "《汽车工程材料》", 31 January 2013 * |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842109A (en) * | 2016-03-29 | 2016-08-10 | 绍兴文理学院元培学院 | Novel two-component textile fiber component ratio test method |
| CN105842115A (en) * | 2016-03-29 | 2016-08-10 | 绍兴文理学院元培学院 | Novel textile fiber density test method |
| CN105842115B (en) * | 2016-03-29 | 2019-03-29 | 绍兴文理学院元培学院 | A kind of new fiber density measurement method |
| CN105842109B (en) * | 2016-03-29 | 2019-03-29 | 绍兴文理学院元培学院 | A kind of novel two-component textile fabric component ratio test method |
| CN106153497A (en) * | 2016-09-09 | 2016-11-23 | 天津工业大学 | A kind of cellulose fibre density measurement method |
| CN106153497B (en) * | 2016-09-09 | 2020-06-26 | 天津工业大学 | Cellulose fiber density determination method |
| CN107290252A (en) * | 2017-06-30 | 2017-10-24 | 浙江石金玄武岩纤维股份有限公司 | A kind of method for testing fiber wetness energy |
| CN107290252B (en) * | 2017-06-30 | 2019-10-11 | 浙江石金玄武岩纤维股份有限公司 | A method of test fiber wetness can |
| CN110118705A (en) * | 2019-04-18 | 2019-08-13 | 山东益大新材料有限公司 | A kind of measuring method improving measurement needle coke real density repeatability |
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