CN103728300B - 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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- CN103728300B CN103728300B CN201310659901.7A CN201310659901A CN103728300B CN 103728300 B CN103728300 B CN 103728300B CN 201310659901 A CN201310659901 A CN 201310659901A CN 103728300 B CN103728300 B CN 103728300B
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- 239000004576 sand Substances 0.000 title claims abstract description 74
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229960000907 methylthioninium chloride Drugs 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000003756 stirring Methods 0.000 claims description 53
- 238000012360 testing method Methods 0.000 claims description 44
- 239000007788 liquid Substances 0.000 claims description 35
- 239000011521 glass Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000012153 distilled water Substances 0.000 claims description 9
- 238000003556 assay Methods 0.000 claims description 7
- 238000007873 sieving Methods 0.000 claims description 6
- 230000001186 cumulative effect Effects 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims description 4
- 239000012086 standard solution Substances 0.000 abstract description 3
- 239000000523 sample Substances 0.000 description 54
- 239000000243 solution Substances 0.000 description 42
- 238000010276 construction Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011044 quartzite Substances 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Sampling And Sample Adjustment (AREA)
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 Machine-made Sand is in the widespread use of China, be less than the index of the absorption property of 75 μm of particles as evaluating particle diameter in Machine-made Sand powder, the estimating 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 laboratory as an index significant to the grade estimation of Machine-made Sand.
China's " building sand " (GB/T 14584-2011) standard, and " highway engineering gather materials testing regulations " (JTG E42-2005) describes a kind of experimental technique of MB value, is extensively adopted at present by each laboratory.But at present in the 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 primarily of what time following: 1) detect sample and adopt below 2.36mm particle 200g, owing to being below 0.075mm particle to the maximum particle of MB value contribution, in the process of sampling may due to the error of sampling cause the sample got can not representative sample reality domain size distribution (particularly fine particle content) and 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, last in transfer pipet droplet habitually blows in beaker with ear washing bulb by some experimenters, and this brings error undoubtedly; Some experimenters have employed the method that buret adds in addition, because the easy color of methylene blue is very dark, is difficult to see concave moon surface clearly clearly, result also in 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 needs the methylene blue adding 20ml easy 1.0, larger for the sample consumption of some MB values more than 1.4, this not only needs a large amount of standard solution, and the sample after test is abandoned and had certain contamination to water and soil afterwards.4) operation easier is large, and the laboratory technician's difficulty adopting pipette, extract 5ml solution to enrich not a lot of experience is larger, is difficult to calmly in 1min complete draw solution, is infected with the processes such as test.Especially for the Machine-made Sand that those MB values are very high, 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 and go wherein to be greater than 2.36mm particle, then adopt 0.6mm sieve to be sieved by sand sample, record sieve weight (m that is upper and two parts sand sample under sieving
onand m
under), take the upper (40 × m of sieve in proportion
on/ (m
on+ m
under) g) and sieve under (40 × m
under/ (m
on+ m
under) g) sand sample altogether 40g,
(2). pour in the beaker of the distilled water filling 100 ± 1g, stir 5min with turbine stirrer with the speed of (600 ± 60) r/min, then stir until off-test with the speed of (400 ± 40) r/min;
(3). adopt graduated syringe will add 1ml methylene blue solution in suspending liquid; then stir at least after 1min with the speed of (400 ± 40) r/min; pick a suspending liquid with glass bar to float, drip in filter paper, observe the tinge of sediment on filter paper; If there is not tinge, adopting graded syringe to add the methylene blue solution of 1ml again, stirring at least after 1min, and observe tinge, repeat above step, until there is tinge around 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, pick a suspending liquid with glass bar; drip and occur tinge on filter paper; continue to stir, every 1min is once infected with test, until tinge can continue 5min;
(4). record tinge can continue the methylene blue solution cumulative volume added by 5min, is accurate to 0.2ml; MB value is calculated, accurate 0.1 by the identical method of GB/T 14584-2011;
Wherein MB is methylene blue number, and unit is g/kg, G is the sample weight (g) tested; V is that the methylene blue consumed is easy to cumulative volume (ml), and 10 is reduction coefficient.
(5). result of calculation contrast GB, meets the requirements for qualified.
Because sample and easy quality equal proportion are reduced to original 1/5 by the present invention, decrease the consumption of solution, utilizing 0.6mm to sieve will mix the error being equipped with and reducing sampling after experiment classification in proportion.Graded syringe is adopted to add methylene blue solution, decrease and add the fashionable error brought due to instrument and operating habit, proved by a large amount of Experimental comparison, after adopting 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 repeats 6 times is less than 5%.
Specific embodiments
Embodiment 1
In Guangzhou Area favour and stone field diorite Machine-made Sand is adopted to be sample, 500g sample will be no less than dry to constant weight, sieve goes wherein to be greater than 2.36mm particle and takes weight (376.30g), adopts 0.6mm sieve to be sieved by sand sample, and record sieves weight (m that is upper and the lower two parts sand sample of sieve
on: 172.13g and m
under: 204.17g), take the upper 18.30g (40 × m of sieve in proportion
on/ (m
on+ m
under)) and the lower 21.70g (40 × m of sieve
under/ (m
on+ m
under)) sand sample 40g altogether, pour in the beaker of the distilled water filling 100 ± 1g, stir 5min with turbine stirrer with the speed of (600 ± 60) r/min, then stir until off-test with the speed of (400 ± 40) r/min.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, pick a suspending liquid with glass bar, drip on filter paper, do not occur tinge.Add 1ml methylene blue solution again, stir at least after 1min, drip by above-mentioned steps and occur tinge on filter paper.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, then record the MB value of this Machine-made Sand for 0.5g/kg.
Adopt Machine-made Sand sample of the same race, measure its MB value by 7.5 chapters in GB/T 14584-2011 " construction 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
Mao Ping stone field, the In Guangzhou Area siltstone Machine-made Sand that goes bad is adopted to be sample, 500g sample will be no less than dry to constant weight, sieve goes wherein to be greater than 2.36mm particle and takes weight (400.50g), adopts 0.6mm sieve to be sieved by sand sample, and record sieves weight (m that is upper and the lower two parts sand sample of sieve
on: 215.50g and m
under: 185.00g), take the upper 21.52g (40 × m of sieve in proportion
on/ (m
on+ m
under)) and the lower 18.48g (40 × m of sieve
under/ (m
on+ m
under)) sand sample 40g altogether, pour in the beaker of the distilled water filling 100 ± 1g, stir 5min with turbine stirrer with the speed of (600 ± 60) r/min, then stir until off-test with the speed of (400 ± 40) r/min.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, pick a suspending liquid with glass bar, drip and do not occur tinge on filter paper.Add 1ml methylene blue solution again, stir at least after 1min, drip by above-mentioned steps and occur tinge on filter paper.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, then record the MB value of this Machine-made Sand for 0.5g/kg.
Adopt Machine-made Sand sample of the same race, measure its MB value by 7.5 chapters in GB/T 14584-2011 " construction 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
The abundant Feng Shi field alteration in In Guangzhou Area diorite Machine-made Sand is adopted to be sample, 500g sample will be no less than dry to constant weight, sieve goes wherein to be greater than 2.36mm particle and takes weight (453.90g), adopts 0.6mm sieve to be sieved by sand sample, and record sieves weight (m that is upper and the lower two parts sand sample of sieve
on: 215.50g and m
under: 238.40g), take the upper 18.99g (40 × m of sieve in proportion
on/ (m
on+ m
under)) and the lower 21.01g (40 × m of sieve
under/ (m
on+ m
under)) sand sample 40g altogether, pour in the beaker of the distilled water filling 100 ± 1g, stir 5min with turbine stirrer with the speed of (600 ± 60) r/min, then stir until off-test with the speed of (400 ± 40) r/min.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, pick a suspending liquid with glass bar, drip and do not occur tinge on filter paper.Add 1ml methylene blue solution again, stir at least after 1min, drip by above-mentioned steps and also do not occur tinge on filter paper.Repeat above-mentioned steps, until when the total amount dripping methylene blue solution is 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, then record the MB value of this Machine-made Sand for 1.25g/kg.
Adopt Machine-made Sand sample of the same race, measure its MB value by 7.5 chapters in GB/T 14584-2011 " construction 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
Adopt Luoding, In Guangzhou Area machine made granite sand to be sample, will be no less than 500g sample and dry to constant weight, sieve goes wherein to be greater than 2.36mm particle and takes weight (445.25g), and employing 0.6mm sieves and sieved by sand sample, record sieve weight (m that is upper and two parts sand sample under sieving
on: 245.30g and m
under: 199.95g), take the upper 22.04g (40 × m of sieve in proportion
on/ (m
on+ m
under)) and the lower 17.96g (40 × m of sieve
under/ (m
on+ m
under)) sand sample 40g altogether, pour in the beaker of the distilled water filling 100 ± 1g, stir 5min with turbine stirrer with the speed of (600 ± 60) r/min, then stir until off-test with the speed of (400 ± 40) r/min.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, pick a suspending liquid with glass bar, drip and occur tinge on filter paper.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, then record the MB value of this Machine-made Sand for 0.25g/kg.
Adopt Machine-made Sand sample of the same race, measure its MB value by 7.5 chapters in GB/T 14584-2011 " construction 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
Adopt Meizhou, In Guangzhou Area diabase Machine-made Sand to be sample, will be no less than 500g sample and dry to constant weight, sieve goes wherein to be greater than 2.36mm particle and takes weight (429.70g), and employing 0.6mm sieves and sieved by sand sample, record sieve weight (m that is upper and two parts sand sample under sieving
on: 209.30g and m
under: 220.40g), take the upper 19.48g (40 × m of sieve in proportion
on/ (m
on+ m
under)) and the lower 20.52g (40 × m of sieve
under/ (m
on+ m
under)) sand sample 40g altogether, pour in the beaker of the distilled water filling 100 ± 1g, stir 5min with turbine stirrer with the speed of (600 ± 60) r/min, then stir until off-test with the speed of (400 ± 40) r/min.Adopt graduated syringe; Add 1ml methylene blue solution in suspending liquid, stir at least after 1min, pick a suspending liquid with glass bar, drip and do not occur tinge on filter paper.Add 1ml methylene blue solution again, stir at least after 1min, drip by above-mentioned steps and also do not occur tinge on filter paper.Repeat above-mentioned steps, until when the total amount dripping methylene blue solution is 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, pick a suspending liquid with glass bar, drip and occur tinge on filter paper, 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, then record the MB value of this Machine-made Sand for 4.6g/kg.
Adopt Machine-made Sand sample of the same race, measure its MB value by 7.5 chapters in GB/T 14584-2011 " construction 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
Adopt In Guangzhou Area arkose quartzite Machine-made Sand to be sample, will be no less than 500g sample and dry to constant weight, sieve goes wherein to be greater than 2.36mm particle and takes weight (341.80g), and employing 0.6mm sieves and sieved by sand sample, record sieve weight (m that is upper and two parts sand sample under sieving
on: 176.40g and m
under: 165.40g), take the upper 20.64g (40 × m of sieve in proportion
on/ (m
on+ m
under)) and the lower 19.36g (40 × m of sieve
under/ (m
on+ m
under)) sand sample 40g altogether, pour in the beaker of the distilled water filling 100 ± 1g, stir 5min with turbine stirrer with the speed of (600 ± 60) r/min, then stir until off-test with the speed of (400 ± 40) r/min.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, pick a suspending liquid with glass bar, drip and do not occur tinge on filter paper.Add 1ml methylene blue solution again, stir at least after 1min, drip by above-mentioned steps and also do not occur tinge on filter paper.Repeat above-mentioned steps, until when the total amount dripping methylene blue solution is 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, pick a suspending liquid with glass bar, drip and occur tinge on filter paper, 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, then record the MB value of this Machine-made Sand for 1.6g/kg.
Adopt Machine-made Sand sample of the same race, measure its MB value by 7.5 chapters in GB/T 14584-2011 " construction 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
Adopt the Lianshan Mountain, In Guangzhou Area sandstone Machine-made Sand to be sample, will be no less than 500g sample and dry to constant weight, sieve goes wherein to be greater than 2.36mm particle and takes weight (421.50g), and employing 0.6mm sieves and sieved by sand sample, record sieve weight (m that is upper and two parts sand sample under sieving
on: 217.50g and m
under: 204.00g), take the upper 20.64g (40 × m of sieve in proportion
on/ (m
on+ m
under)) and the lower 19.36g (40 × m of sieve
under/ (m
on+ m
under)) sand sample 40g altogether, pour in the beaker of the distilled water filling 100 ± 1g, stir 5min with turbine stirrer with the speed of (600 ± 60) r/min, then stir until off-test with the speed of (400 ± 40) r/min.Adopt graduated syringe to add 1ml methylene blue solution in suspending liquid, stir at least after 1min, pick a suspending liquid with glass bar, drip and occur tinge on filter paper.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, pick a suspending liquid with glass bar, drip and occur tinge on filter paper, 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, then record the MB value of this Machine-made Sand for 0.35g/kg.
Adopt Machine-made Sand sample of the same race, measure its MB value by 7.5 chapters in GB/T 14584-2011 " construction 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) 500g Machine-made Sand will be no less than to dry to constant weight, and sieve and go wherein to be greater than 2.36mm particle, then adopt 0.6mm sieve to be sieved by sand sample, record sieve weight m that is upper and two parts sand sample under sieving
onand m
under, take the upper 40 × m of sieve in proportion
on/ (m
on+ m
under) under g and the lower 40 × m of sieve/(m
on+ m
under) g sand sample 40g altogether;
(2) pour in the beaker of the distilled water filling 100 ± 1g, stir 5min with turbine stirrer with the speed of (600 ± 60) r/min, then stir until off-test with the speed of (400 ± 40) r/min;
(3) graduated syringe is adopted will to add 1ml methylene blue solution in suspending liquid; then stir at least after 1min with the speed of (400 ± 40) r/min; pick a suspending liquid with glass bar to float, drip in filter paper, observe the tinge of sediment on filter paper; If there is not tinge, adopt graded syringe to add the methylene blue solution of 1ml again, stir at least after 1min, and observe tinge, repeat above step, until there is tinge around 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, pick a suspending liquid with glass bar, drip and occur tinge on filter paper, continue to stir, every 1min is once infected with test, until tinge can continue 5min;
(4) record tinge can continue the methylene blue solution cumulative volume added by 5min, is accurate to 0.2ml; MB value is calculated, accurate 0.1 by the identical method of GB/T 14584-2011;
Wherein MB is methylene blue number, and unit is g/kg, G is the sample weight (g) tested, and V is the cumulative volume (ml) of the methylene blue solution consumed, and 10 is reduction coefficient.
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|---|---|---|---|
| CN201310659901.7A CN103728300B (en) | 2013-12-09 | 2013-12-09 | Method for measuring methylene blue (MB) value of machine-made sand |
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|---|---|---|---|
| CN201310659901.7A CN103728300B (en) | 2013-12-09 | 2013-12-09 | Method for measuring methylene blue (MB) value of machine-made sand |
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| CN103728300B true CN103728300B (en) | 2014-12-24 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| 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 |
| 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 |
| CN114965167B (en) * | 2022-06-10 | 2025-02-18 | 中铁八局集团第七工程有限公司 | A method for quickly judging whether the methylene blue value of machine-made sand is qualified |
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| FR2906241B1 (en) * | 2006-09-26 | 2008-12-05 | Lafarge Sa | SAND PRODUCTION LINE PROCESS HAVING CONTROLLED METHYLENE BLUE VALUE |
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| CN103304171A (en) * | 2013-06-13 | 2013-09-18 | 南京工业大学 | Machine-made sand preparation method capable of replacing natural sand |
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