CN103728300A - Method for measuring methylene blue (MB) value of machine-made sand - Google Patents
Method for measuring methylene blue (MB) value of machine-made sand Download PDFInfo
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- CN103728300A CN103728300A CN201310659901.7A CN201310659901A CN103728300A CN 103728300 A CN103728300 A CN 103728300A CN 201310659901 A CN201310659901 A CN 201310659901A CN 103728300 A CN103728300 A CN 103728300A
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Abstract
The invention discloses a method for measuring the methylene blue (MB) value of machine-made sand. The method comprises five steps to judge whether the machine-made sand meets the requirement or not accurately. According to the method, not only are the doses of samples and a standard solution reduced, but also the MB value measuring accuracy of the machine-made sand is improved while error is reduced.
Description
Technical field
The invention belongs to building and building materials field, relate to a kind of assay method of Machine-made Sand methylenum careuleum MB value.
Background technology
Along with the widespread use of Machine-made Sand in China, as particle diameter in evaluation Machine-made Sand powder, be less than the index of the absorption property of 75 μ m particles, the mensuration precision of MB value and accuracy are the important indicators of Machine-made Sand grading evaluation and inspection.MB pH-value determination pH starts to carry out in a lot of field laboratories to the significant index of the grade estimation of Machine-made Sand as one.
China < < building sand > > (GB/T 14584-2011) standard, and the < < highway engineering testing regulations > > (JTG E42-2005) that gathers materials introduced a kind of experimental technique of MB value, by each laboratory, extensively adopted at present.But at present in application also owing to there is the restrictions such as operating habit custom and laboratory condition, make test findings appearance error in various degree.Analyze its reason mainly by what time following: 1) detect sample and adopt the following particle 200g of 2.36mm, owing to being the following particle of 0.075mm to the maximum particle of MB value contribution, in the process of sampling, may cause due to the error of sampling the actual particle diameter distribution (particularly fine particle content) that the sample got can not representative sample to cause test error; 2) error in methylene blue solution adition process: in most laboratory, add methylene blue 5ml(or express method) what all adopt is transfer pipet, some experimenters habitually blow to last in transfer pipet in beaker with ear washing bulb, and this has brought error undoubtedly; The method that also has some experimenters to adopt buret to add, because the easy color of methylene blue is very dark, is difficult to see clearly clearly concave moon surface, has also caused the appearance of some errors; 3) methylene blue consumption is large: the methylene blue solution consumption that code test adopts is large, for a sand sample (200g), if MB value just need to add the methylene blue of 20ml easy 1.0, larger at more than 1.4 sample consumptions for some MB values, this not only needs a large amount of standard solution, and the sample after test is abandoned and rear water and soil had to certain contamination.4) operation easier is large, adopts pipette, extract 5ml solution larger to the abundant not laboratory technician's difficulty of a lot of experiences, is difficult to the calm draw solution that completes in 1min, is infected with the processes such as test.Special in the very high Machine-made Sand of those MB values, test difficulty is very large.
Summary of the invention
The object of the present invention is to provide a kind of consumption that not only can reduce sample and standard solution, and improve the precision of Machine-made Sand methylenum careuleum MB value and reduce the assay method of a kind of Machine-made Sand methylenum careuleum MB value of error.
The assay method of a kind of Machine-made Sand methylenum careuleum MB value of the present invention for achieving the above object, is characterized in that: this assay method step is as follows:
(1) not rare 500g Machine-made Sand is dried to constant weight, sieve goes to be wherein greater than 2.36mm particle, then adopts 0.6mm sieve that sand sample is sieved, and record sieves weight (m upper and the lower two parts sand sample of sieve
onand m
under), take in proportion the upper (40 * m of sieve
on/ (m
on+ m
under) g) and sieve under (40 * m
under/ (m
on+ m
under) g) the common 40g of sand sample,
(2). pour in the beaker of the distilled water that fills 100 ± 1g, the speed stirring 5min with turbine stirrer with (600 ± 60) r/min, then the speed with (400 ± 40) r/min stirs until off-test;
(3). adopt graduated syringe in suspending liquid, to add 1ml methylene blue solution; then with the speed of (400 ± 40) r/min, stir at least after 1min; with glass bar, pick a suspending liquid floating, drip in filter paper, observe the tinge of sediment on filter paper; If there is not tinge, adopting scale syringe to add again the methylene blue solution of 1ml, stir at least after 1min, and observe tinge, repeat above step, until tinge appears around in sediment; Now should continue to stir; every 1min is once infected with test; if disappear in 4min; in suspending liquid, add 0.4ml methylene blue solution, stir at least after 1min, with glass bar, pick a suspending liquid; drip and on filter paper, occur tinge; continue to stir, every 1min is once infected with test, until tinge can continue 5min;
(4). record tinge and can continue the added methylene blue solution cumulative volume of 5min, be accurate to 0.2ml; Press the identical method of GB/T 14584-2011 and calculate MB value, accurate 0.1;
Wherein MB is methylene blue number, and unit is g/kg, and G is the sample weight (g) of test; V is that the methylene blue consuming is easy to cumulative volume (ml), and 10 is reduction coefficient.
(5). result of calculation contrast GB, meets the requirements for qualified.
Due to the present invention by reducing to of sample and easy quality equal proportion original 1/5, reduced the consumption of solution, utilize 0.6mm sieve mix in proportion after will experiment classification and be equipped with the error that reduces sampling.Adopt scale syringe to add methylene blue solution, reduced and added the fashionable error of bringing due to instrument and operating habit, by a large amount of experiment contrast proofs, adopting after the method for this patent the precision of MB value can reach 0.02(standard-required is 0.1), the coefficient of dispersion of the measured value after same sample repetition 6 times is less than 5%.
Specific embodiments
Embodiment 1
Adopting In Guangzhou Area favour and stone field diorite Machine-made Sand is sample, to be no less than 500g sample dries to constant weight, sieve removes to be wherein greater than 2.36mm particle and takes weight (376.30g), adopts 0.6mm sieve that sand sample is sieved, and record sieves weight (m upper and the lower two parts sand sample of sieve
on: 172.13g and m
under: 204.17g), take in proportion the upper 18.30g (40 * m of sieve
on/ (m
on+ m
under)) and the lower 21.70g (40 * m of sieve
under/ (m
on+ m
under)) the common 40g of sand sample, pour in the beaker of the distilled water that fills 100 ± 1g, the speed stirring 5min with turbine stirrer with (600 ± 60) r/min, then the speed with (400 ± 40) r/min stirs until off-test.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, with glass bar, pick a suspending liquid, drip on filter paper, do not occur tinge.Add again 1ml methylene blue solution, stir at least after 1min, by above-mentioned steps, drip and on filter paper, occur tinge.Continue to stir, every 1min is once infected with test, and tinge continues 5min, and test adds methylene blue solution 2ml altogether in suspending liquid.Repeat 3 tests, the addition of methylene blue solution is 2ml, and the MB value that records this Machine-made Sand is 0.5g/kg.
Adopt Machine-made Sand sample of the same race, by GB/T 14584-2011 < <, build and measure its MB value with 7.5 chapters in sand > > standard, three times measurement result is respectively 0.5g/kg, 0.6g/kg, 0.5g/kg.MB value is less than 1.4 for qualified.
Embodiment 2
Adopting the rotten siltstone Machine-made Sand in Mao Ping stone field, In Guangzhou Area is sample, to be no less than 500g sample dries to constant weight, sieve removes to be wherein greater than 2.36mm particle and takes weight (400.50g), adopts 0.6mm sieve that sand sample is sieved, and record sieves weight (m upper and the lower two parts sand sample of sieve
on: 215.50g and m
under: 185.00g), take in proportion the upper 21.52g (40 * m of sieve
on/ (m
on+ m
under)) and the lower 18.48g (40 * m of sieve
under/ (m
on+ m
under)) the common 40g of sand sample, pour in the beaker of the distilled water that fills 100 ± 1g, the speed stirring 5min with turbine stirrer with (600 ± 60) r/min, then the speed with (400 ± 40) r/min stirs until off-test.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, with glass bar, pick a suspending liquid, drip and on filter paper, do not occur tinge.Add again 1ml methylene blue solution, stir at least after 1min, by above-mentioned steps, drip and on filter paper, occur tinge.Continue to stir, every 1min is once infected with test, and tinge continues 5min, and test adds methylene blue solution 2ml altogether in suspending liquid.Repeat 3 tests, the addition of methylene blue solution is 2ml, and the MB value that records this Machine-made Sand is 0.5g/kg.
Adopt Machine-made Sand sample of the same race, by GB/T 14584-2011 < <, build and measure its MB value with 7.5 chapters in sand > > standard, three times measurement result is respectively 0.5g/kg, 0.6g/kg, 0.6g/kg.MB value is less than 1.4 for qualified.
Embodiment 3
Adopting In Guangzhou Area abundant Feng Shi field alteration diorite Machine-made Sand is sample, to be no less than 500g sample dries to constant weight, sieve removes to be wherein greater than 2.36mm particle and takes weight (453.90g), adopts 0.6mm sieve that sand sample is sieved, and record sieves weight (m upper and the lower two parts sand sample of sieve
on: 215.50g and m
under: 238.40g), take in proportion the upper 18.99g (40 * m of sieve
on/ (m
on+ m
under)) and the lower 21.01g (40 * m of sieve
under/ (m
on+ m
under)) the common 40g of sand sample, pour in the beaker of the distilled water that fills 100 ± 1g, the speed stirring 5min with turbine stirrer with (600 ± 60) r/min, then the speed with (400 ± 40) r/min stirs until off-test.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, with glass bar, pick a suspending liquid, drip and on filter paper, do not occur tinge.Add again 1ml methylene blue solution, stir at least after 1min, by above-mentioned steps, drip and on filter paper, also do not occur tinge.Repeat above-mentioned steps, until when dripping the total amount of methylene blue solution and being 5ml, there is tinge.Continue to stir, every 1min is once infected with test, and tinge continues 5min, and test adds methylene blue solution 5ml altogether in suspending liquid.Repeat 3 tests, the addition of methylene blue solution is 5ml, and the MB value that records this Machine-made Sand is 1.25g/kg.
Adopt Machine-made Sand sample of the same race, by GB/T 14584-2011 < <, build and measure its MB value with 7.5 chapters in sand > > standard, three times measurement result is respectively 1.2g/kg, 1.2g/kg, 1.25g/kg.MB value is less than 1.4 for qualified.
Embodiment 4
Adopting Luoding, In Guangzhou Area machine made granite sand is sample, will be no less than 500g sample and dry to constant weight, and sieves and removes to be wherein greater than 2.36mm particle and take weight (445.25g), adopts 0.6mm sieve that sand sample is sieved, and records sieve above and weight (the m of the lower two parts sand sample of sieve
on: 245.30g and m
under: 199.95g), take in proportion the upper 22.04g (40 * m of sieve
on/ (m
on+ m
under)) and the lower 17.96g (40 * m of sieve
under/ (m
on+ m
under)) the common 40g of sand sample, pour in the beaker of the distilled water that fills 100 ± 1g, the speed stirring 5min with turbine stirrer with (600 ± 60) r/min, then the speed with (400 ± 40) r/min stirs until off-test.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, with glass bar, pick a suspending liquid, drip and on filter paper, occur tinge.Continue to stir, every 1min is once infected with test, and tinge continues 5min, and test adds methylene blue solution 1ml altogether in suspending liquid.Repeat 3 tests, the addition of methylene blue solution is 1ml, and the MB value that records this Machine-made Sand is 0.25g/kg.
Adopt Machine-made Sand sample of the same race, by GB/T 14584-2011 < <, build and measure its MB value with 7.5 chapters in sand > > standard, three times measurement result is respectively 0.25g/kg, 0.25g/kg, 0.35g/kg.MB value is less than 1.4 for qualified.
Embodiment 5
Adopting Meizhou, In Guangzhou Area diabase Machine-made Sand is sample, will be no less than 500g sample and dry to constant weight, and sieves and removes to be wherein greater than 2.36mm particle and take weight (429.70g), adopts 0.6mm sieve that sand sample is sieved, and records sieve above and weight (the m of the lower two parts sand sample of sieve
on: 209.30g and m
under: 220.40g), take in proportion the upper 19.48g (40 * m of sieve
on/ (m
on+ m
under)) and the lower 20.52g (40 * m of sieve
under/ (m
on+ m
under)) the common 40g of sand sample, pour in the beaker of the distilled water that fills 100 ± 1g, the speed stirring 5min with turbine stirrer with (600 ± 60) r/min, then the speed with (400 ± 40) r/min stirs until off-test.Adopt graduated syringe; In suspending liquid, add 1ml methylene blue solution, stir at least after 1min, with glass bar, pick a suspending liquid, drip and on filter paper, do not occur tinge.Add again 1ml methylene blue solution, stir at least after 1min, by above-mentioned steps, drip and on filter paper, also do not occur tinge.Repeat above-mentioned steps, until when dripping the total amount of methylene blue solution and being 18ml, there is tinge.Continue to stir, every 1min is once infected with test, tinge disappears when 4min, in suspending liquid, add 0.4ml methylene blue solution, stir at least after 1min, with glass bar, pick a suspending liquid, drip and on filter paper, occur tinge, continue to stir, every 1min is once infected with test, and tinge continues 5min.Test adds methylene blue solution 18.4ml altogether in suspending liquid.Repeat 3 tests, the addition of methylene blue solution is 18.4ml, and the MB value that records this Machine-made Sand is 4.6g/kg.
Adopt Machine-made Sand sample of the same race, by GB/T 14584-2011 < <, build and measure its MB value with 7.5 chapters in sand > > standard, three times measurement result is respectively 4.75g/kg, 4.55g/kg, 4.6g/kg.MB value is less than 1.4 for qualified.
Embodiment 6
Adopting In Guangzhou Area arkose quartzite Machine-made Sand is sample, will be no less than 500g sample and dry to constant weight, and sieves and removes to be wherein greater than 2.36mm particle and take weight (341.80g), adopts 0.6mm sieve that sand sample is sieved, and records sieve above and weight (the m of the lower two parts sand sample of sieve
on: 176.40g and m
under: 165.40g), take in proportion the upper 20.64g (40 * m of sieve
on/ (m
on+ m
under)) and the lower 19.36g (40 * m of sieve
under/ (m
on+ m
under)) the common 40g of sand sample, pour in the beaker of the distilled water that fills 100 ± 1g, the speed stirring 5min with turbine stirrer with (600 ± 60) r/min, then the speed with (400 ± 40) r/min stirs until off-test.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, with glass bar, pick a suspending liquid, drip and on filter paper, do not occur tinge.Add again 1ml methylene blue solution, stir at least after 1min, by above-mentioned steps, drip and on filter paper, also do not occur tinge.Repeat above-mentioned steps, until when dripping the total amount of methylene blue solution and being 6ml, there is tinge.Continue to stir, every 1min is once infected with test, tinge disappears when 4min, in suspending liquid, add 0.4ml methylene blue solution, stir at least after 1min, with glass bar, pick a suspending liquid, drip and on filter paper, occur tinge, continue to stir, every 1min is once infected with test, and tinge continues 5min.Test adds methylene blue solution 6.4ml altogether in suspending liquid.Repeat 3 tests, the addition of methylene blue solution is 6.4ml, and the MB value that records this Machine-made Sand is 1.6g/kg.
Adopt Machine-made Sand sample of the same race, by GB/T 14584-2011 < <, build and measure its MB value with 7.5 chapters in sand > > standard, three times measurement result is respectively 1.6g/kg, 1.7g/kg, 1.6g/kg.MB value is less than 1.4 for qualified.
Embodiment 7
Adopting the Lianshan Mountain, In Guangzhou Area sandstone Machine-made Sand is sample, will be no less than 500g sample and dry to constant weight, and sieves and removes to be wherein greater than 2.36mm particle and take weight (421.50g), adopts 0.6mm sieve that sand sample is sieved, and records sieve above and weight (the m of the lower two parts sand sample of sieve
on: 217.50g and m
under: 204.00g), take in proportion the upper 20.64g (40 * m of sieve
on/ (m
on+ m
under)) and the lower 19.36g (40 * m of sieve
under/ (m
on+ m
under)) the common 40g of sand sample, pour in the beaker of the distilled water that fills 100 ± 1g, the speed stirring 5min with turbine stirrer with (600 ± 60) r/min, then the speed with (400 ± 40) r/min stirs until off-test.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, with glass bar, pick a suspending liquid, drip and on filter paper, occur tinge.Continue to stir, every 1min is once infected with test, tinge disappears when 4min, in suspending liquid, add 0.4ml methylene blue solution, stir at least after 1min, with glass bar, pick a suspending liquid, drip and on filter paper, occur tinge, continue to stir, every 1min is once infected with test, and tinge continues 5min.Test adds methylene blue solution 1.4ml altogether in suspending liquid.Repeat 3 tests, the addition of methylene blue solution is 1.4ml, and the MB value that records this Machine-made Sand is 0.35g/kg.
Adopt Machine-made Sand sample of the same race, by GB/T 14584-2011 < <, build and measure its MB value with 7.5 chapters in sand > > standard, three times measurement result is respectively 0.35g/kg, 0.35g/kg, 0.25g/kg.MB value is less than 1.4 for qualified.
Claims (1)
1. an assay method for Machine-made Sand methylenum careuleum MB value, is characterized in that: this assay method step is as follows:
(1) not rare 500g Machine-made Sand is dried to constant weight, sieve goes to be wherein greater than 2.36mm particle, then adopts 0.6mm sieve that sand sample is sieved, and record sieves weight (m upper and the lower two parts sand sample of sieve
onand m
under), take in proportion the upper (40 * m of sieve
on/ (m
on+ m
under) g) and sieve under (40 * m
under/ (m
on+ m
under) g) the common 40g of sand sample;
(2) pour in the beaker of the distilled water that fills 100 ± 1g, the speed stirring 5min with turbine stirrer with (600 ± 60) r/min, then the speed with (400 ± 40) r/min stirs until off-test;
(3) adopt graduated syringe in suspending liquid, to add 1ml methylene blue solution, then with the speed of (400 ± 40) r/min, stir at least after 1min, with glass bar, pick a suspending liquid floating, drip in filter paper, observe the tinge of sediment on filter paper; If there is not tinge, adopting scale syringe to add again the methylene blue solution of 1ml, stir at least after 1min, and observe tinge, repeat above step, until tinge appears around in sediment; Now should continue to stir, every 1min is once infected with test, if disappear in 4min, in suspending liquid, add 0.4ml methylene blue solution, stir at least after 1min, with glass bar, pick a suspending liquid, drip and on filter paper, occur tinge, continue to stir, every 1min is once infected with test, until tinge can continue 5min;
(4) record tinge and can continue the added methylene blue solution cumulative volume of 5min, be accurate to 0.2ml; Press the identical method of GB/T 14584-2011 and calculate MB value, accurate 0.1;
Wherein MB is methylene blue number, and unit is g/kg, and G is the sample weight (g) of test, and V is that the methylene blue consuming is easy to cumulative volume (ml), and 10 is reduction coefficient;
(5) result of calculation contrast GB, meets the requirements for qualified.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062397A (en) * | 2014-07-04 | 2014-09-24 | 北京东方建宇混凝土科学技术研究院有限公司 | Measuring method for MB value of recycled micro-powder |
| CN105842239A (en) * | 2016-03-23 | 2016-08-10 | 北京盛广拓公路科技有限公司 | Asphalt aging performance evaluation method |
| CN105866108A (en) * | 2016-03-23 | 2016-08-17 | 北京盛广拓公路科技有限公司 | Evaluation method for activity of old material of bituminous pavement |
| CN106556555A (en) * | 2016-10-31 | 2017-04-05 | 中交武汉港湾工程设计研究院有限公司 | A kind of accurate method for determining Machine-made Sand methylene blue MB values |
| CN109187381A (en) * | 2018-08-01 | 2019-01-11 | 中建西部建设西南有限公司 | A kind of method of quick measurement Machine-made Sand MB value |
| CN111562194A (en) * | 2020-05-19 | 2020-08-21 | 中交第四航务工程局有限公司 | Quick test method for MB value of machine-made sand |
| CN111751239A (en) * | 2020-02-24 | 2020-10-09 | 安吉龙港混凝土制品有限公司 | Method for judging stone powder content in artificial sand and mixed sand |
| CN112129883A (en) * | 2019-06-24 | 2020-12-25 | 亚东预拌混凝土股份有限公司 | Methylene blue fast screening detection method for sand and stone fine granule material |
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Cited By (11)
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|---|---|---|---|---|
| CN104062397A (en) * | 2014-07-04 | 2014-09-24 | 北京东方建宇混凝土科学技术研究院有限公司 | Measuring method for MB value of recycled micro-powder |
| CN105842239A (en) * | 2016-03-23 | 2016-08-10 | 北京盛广拓公路科技有限公司 | Asphalt aging performance evaluation method |
| CN105866108A (en) * | 2016-03-23 | 2016-08-17 | 北京盛广拓公路科技有限公司 | Evaluation method for activity of old material of bituminous pavement |
| CN105842239B (en) * | 2016-03-23 | 2018-08-14 | 北京盛广拓公路科技有限公司 | A kind of Evaluation method of asphalt aging properties |
| CN105866108B (en) * | 2016-03-23 | 2018-08-28 | 北京盛广拓公路科技有限公司 | A kind of old material of asphalt pavement activity rating method |
| CN106556555A (en) * | 2016-10-31 | 2017-04-05 | 中交武汉港湾工程设计研究院有限公司 | A kind of accurate method for determining Machine-made Sand methylene blue MB values |
| CN109187381A (en) * | 2018-08-01 | 2019-01-11 | 中建西部建设西南有限公司 | A kind of method of quick measurement Machine-made Sand MB value |
| CN112129883A (en) * | 2019-06-24 | 2020-12-25 | 亚东预拌混凝土股份有限公司 | Methylene blue fast screening detection method for sand and stone fine granule material |
| CN111751239A (en) * | 2020-02-24 | 2020-10-09 | 安吉龙港混凝土制品有限公司 | Method for judging stone powder content in artificial sand and mixed sand |
| CN111562194A (en) * | 2020-05-19 | 2020-08-21 | 中交第四航务工程局有限公司 | Quick test method for MB value of machine-made sand |
| CN111562194B (en) * | 2020-05-19 | 2022-03-18 | 中交第四航务工程局有限公司 | Quick test method for MB value of machine-made sand |
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