CN113720804A - Method for rapidly detecting residual quantity of flocculating agent in sand for concrete - Google Patents
Method for rapidly detecting residual quantity of flocculating agent in sand for concrete Download PDFInfo
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- CN113720804A CN113720804A CN202110861099.4A CN202110861099A CN113720804A CN 113720804 A CN113720804 A CN 113720804A CN 202110861099 A CN202110861099 A CN 202110861099A CN 113720804 A CN113720804 A CN 113720804A
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- 239000004567 concrete Substances 0.000 title claims abstract description 59
- 239000004576 sand Substances 0.000 title claims abstract description 49
- 239000008394 flocculating agent Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 239000000725 suspension Substances 0.000 claims description 73
- 229920002401 polyacrylamide Polymers 0.000 claims description 23
- 238000002834 transmittance Methods 0.000 claims description 22
- 239000007864 aqueous solution Substances 0.000 claims description 21
- 229910000278 bentonite Inorganic materials 0.000 claims description 19
- 239000000440 bentonite Substances 0.000 claims description 19
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 19
- 239000000706 filtrate Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 11
- 238000005352 clarification Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002245 particle Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a method for rapidly detecting the residual quantity of a flocculating agent in sand for concrete, which comprises the steps of firstly doping flocculating agents to be detected with different concentrations into concrete to obtain the influence rule of the flocculating agents to be detected on the working performance of the concrete, and determining the qualified doping quantity standard of the flocculating agents to be detected; and then, a rapid detection method of the flocculating agent is utilized to rapidly determine whether the concentration range of the flocculating agent remaining in the sand exceeds the qualified mixing amount standard of the flocculating agent to be detected. The advantages are that: the method can realize rapid judgment of whether the content of the flocculating agent in the concrete sand is excessive, plays a guiding role in using the residual sand with the flocculating agent in a mixing plant, and provides suggestions for reasonably using the flocculating agent for sandstone production enterprises, thereby achieving rapid detection, scientific use and fine control and reducing the influence on the performance of the concrete.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a method for detecting residual quantity of a flocculating agent in sand for concrete.
Background
The mechanism of the flocculating agent is mainly that groups with positive (negative) electricity and particles or granules with negative (positive) electricity in water which are difficult to separate are close to each other, the potential of the particles is reduced, the particles are in an unstable state, and the particles are concentrated and separated by a physical or chemical method by utilizing the polymerization property of the particles.
In recent years, with the vigorous development of the construction industry, the sand is tense and the quality is worse and worse, and various kinds of mountain sand and machine sand with high mud content are not used. From 2018, 1 month, a plurality of environmental methods and environmental protection schemes are started to be implemented, the wastewater of the sandstone plant is definitely required to be strictly discharged and needs to be recycled, so that a large number of sandstone plants adopt flocculating agents (mainly polyacrylamide flocculating agents) in the sewage treatment process to accelerate the sedimentation of suspended matters in the sewage, and the sewage subjected to sand washing can be quickly and effectively subjected to precipitation treatment and recycling. In order to achieve the effect, the sandstone production enterprises use higher flocculating agent dosage, and the residual flocculating agent dosage in the factory sand is very high, which will cause adverse effect on the performance of concrete mixture.
For the concrete industry, machine-made sand is large in demand and complex in source, but the existing flocculant detection method cannot achieve the purpose of rapid and effective detection, and the influence of residual flocculant in the sand on the performance of concrete cannot be judged. A small amount of flocculant is beneficial to improving the working performance of concrete, but the working performance of the concrete is seriously influenced after the flocculant is excessive. Therefore, how to quickly judge whether the content of the flocculating agent in the concrete sand is excessive is a technical problem to be solved in the field of knocking.
Disclosure of Invention
The invention provides a method for rapidly detecting the residual quantity of a flocculating agent in concrete sand, which aims to rapidly judge whether the content of the flocculating agent in the concrete sand is excessive.
The technical scheme adopted by the invention is as follows: the method for rapidly detecting the residual quantity of the flocculating agent in the sand for the concrete comprises the following steps:
s1, preparing a concrete sample from the sand sample for the concrete to be tested, which does not contain the flocculant, and other concrete raw materials according to the process requirements, and doping the flocculant to be tested with different mass proportions into the concrete sample to prepare N groups of standard concrete to be tested, wherein N is more than or equal to 5;
s2, respectively detecting the working performance of N groups of standard concrete to be detected, and determining the qualified mixing amount standard of the flocculant to be detected according to the detection result;
s3, preparing a flocculant aqueous solution with a certain concentration by using a flocculant to be detected, measuring a g of the flocculant aqueous solution, adding b g bentonite into the flocculant aqueous solution, and stirring to disperse the bentonite into the solution to obtain a suspension A;
s4, adding a certain amount of the sand sample for the concrete to be tested, which does not contain the flocculant, into a certain amount of the flocculant aqueous solution, uniformly mixing, and filtering to obtain a filtrate A; then a g the filtrate A is measured, B g bentonite is added into the filtrate A, and the mixture is stirred to ensure that the bentonite is dispersed in the solution, thus obtaining suspension B;
s5, standing the suspension A and the suspension B for the same time after oscillation to compare the clarification speeds of the suspension A and the suspension B, testing the light transmittance of the suspension A and the suspension B by using a light transmittance instrument, if the light transmittance of the suspension B is the same as that of the suspension A (due to the error of the instrument, the difference value of the light transmittance is not more than 0.5 percent, the light transmittance is considered to be the same), performing S6 if the clarification speed of the suspension A is the same as that of the suspension B, otherwise, terminating the method, and determining the residual quantity of the flocculant by using other methods;
s6, preparing a flocculant aqueous solution with standard concentration according to the qualified doping amount standard of the flocculant measured in the step S2, measuring cg of the flocculant aqueous solution with standard concentration, adding d g bentonite into the flocculant aqueous solution with standard concentration, and stirring uniformly to obtain a suspension C;
s7, measuring a certain amount of a sand sample containing a flocculating agent for the concrete to be tested, adding the sand sample into water with equal mass, uniformly stirring, and filtering to obtain a filtrate B; then adding D g bentonite into the c g filtrate B, and stirring uniformly to obtain a suspension D;
s8, standing the suspension C and the suspension D for the same time after oscillation, comparing the clarification speeds of the suspension C and the suspension D, testing the light transmittance of the suspension C and the suspension D by using a light transmittance instrument, and if the light transmittance of the suspension D is greater than that of the suspension C, indicating that the doping amount of the flocculant of the sand sample for the concrete to be tested exceeds the qualified doping amount standard; and otherwise, if the light transmittance of the suspension D is not greater than that of the suspension C, indicating that the doping amount of the flocculant of the sand sample for the concrete to be tested does not exceed the qualified doping amount standard.
The invention is further improved by the following steps that a: b is 100-150: 1; d is 100-150: 1.
As a further improvement of the invention, the flocculant is polyacrylamide.
The invention has the beneficial effects that: firstly, doping to-be-detected flocculants with different concentrations into concrete to obtain the influence rule of the to-be-detected flocculants on the working performance of the concrete, and determining the qualified doping amount standard of the to-be-detected flocculants; and then, a rapid detection method of the flocculating agent is utilized to rapidly determine whether the concentration range of the flocculating agent remaining in the sand exceeds the qualified mixing amount standard of the flocculating agent to be detected. The method can realize rapid judgment of whether the content of the flocculating agent in the concrete sand is excessive, plays a guiding role in using the residual sand with the flocculating agent in a mixing plant, and provides suggestions for reasonably using the flocculating agent for sandstone production enterprises, thereby achieving rapid detection, scientific use and fine control and reducing the influence on the performance of the concrete.
Drawings
FIG. 1 shows the effect of different amounts of polyacrylamide on the compressive strength of the examples.
FIG. 2 is a graph showing a comparison of the clarification rates of suspension A and suspension B in examples.
FIG. 3 is a graph comparing the clarification rates of blank suspension, suspension C0, suspension C1, and suspension D in the examples.
Detailed Description
The present invention will be further described with reference to the following examples.
Example (b):
the residual quantity of the flocculant in the concrete sand is detected according to the following method:
(1) mixing the following concrete raw materials in parts by weight: preparing a concrete sample by 270kg of cement, 58kg of mineral powder, 40kg of fly ash, 172kg of water, 890kg of sand to be tested without flocculant, 1003kg of macadam and 7.73kg of additive; mixing polyacrylamide with different mass proportions into the concrete sample, wherein the mixing amount of the polyacrylamide (based on the weight of the sand to be measured) is 0, 0.01 per thousand, 0.05 per thousand, 0.1 per thousand, 0.5 per thousand and 1 per thousand respectively; preparing six groups of standard concrete to be tested;
(2) the working performance of the six groups of standard concrete to be tested was tested, in this example, slump, expansion, slump emptying time and time loss were used to test the working performance of the concrete, and the results are shown in table 1.
Table 1 table of six sets of test results of working performance of standard concrete
| |
1 | 2 | 3 | 4 | 5 | 6 |
| Amount of |
0 | 0.01‰ | 0.05‰ | 0.1‰ | 0.5‰ | 1‰ |
| Additional Water (kg) | 0 | 5 | 5 | 5 | 22.8 | 50 |
| Slump (mm) | 205 | 205 | 220 | 215 | 220 | 215 |
| Slump after 2h (mm) | 215 | 230 | 220 | 230 | 220 | 215 |
| Extension degree (mm) | 560/580 | 540/550 | 580/600 | 610/610 | 490/490 | 480/470 |
| Extension after 2h (mm) | 570/580 | 580/600 | 560/580 | 570/600 | 450/460 | 450/470 |
| Collapse evacuation time(s) | 19 | 9.9 | 16 | 12 | 8 | 5 |
| Collapse after 2h empty time(s) | 22 | 20 | 25 | 42 | 36 | 19 |
As can be seen from Table 1, samples 2, 3 and 4 were added at a rate of 5kg/m, compared to sample 13After water is added, slump, expansion and slump emptying time are all improved, when the mixing amount of polyacrylamide is 0.1 per mill (sample 4), the slump loss influence of the sample is large after 2 hours, the slump loss influence is improved from 12 seconds to 42 seconds, and the viscosity of concrete is obviously increased, so that the workability is obviously influenced. When the dosage of polyacrylamide reaches 0.5 per mill, 22.8kg/m is additionally added to achieve certain working performance of the system3The water of (2).
As can be seen from FIG. 1, samples 2, 3 and 4 were added at 5kg/m, compared to sample 1, which was not doped with polyacrylamide3After water is added, the compressive strength is reduced to some extent, and when the mixing amount reaches 0.5 per mill, the compressive strength is 44.2MPa, which is reduced by nearly 20 percent. Since the working performance of the concrete is deteriorated after the polyacrylamide is mixed, additional water is added to achieve a certain working performance, which affects the strength of the concrete. Therefore, in terms of working performance and compressive strength, the residual quantity of polyacrylamide in the sand is not more than 0.1 per thousand, namely the qualified mixing quantity standard of the flocculant to be detected is 0.1 per thousand.
(3) Adding polyacrylamide with the weight of 0.1g into water with the weight of 1000g and the temperature of 20 ℃ to prepare polyacrylamide aqueous solution, and fully dissolving the polyacrylamide aqueous solution; then 25g of polyacrylamide aqueous solution is measured, 0.2g of bentonite is added into the polyacrylamide aqueous solution, and the mixture is stirred to ensure that the bentonite is dispersed in the solution, thus obtaining suspension A;
(4) taking 100g of sand to be detected without flocculant, adding the sand to be detected into 100g of the polyacrylamide aqueous solution, stirring the sand for 10 seconds by using a glass rod, and filtering the mixture to obtain filtrate A; then 25g of filtrate A is measured, 0.2g of bentonite is added into the filtrate A, and the mixture is stirred to ensure that the bentonite is dispersed in the solution, thus obtaining suspension B;
(5) suspension a and suspension B were shaken up and down, left to stand for 2 minutes, and tested by a luminometer for light transmittances of 4.5% and 4.4%, respectively, indicating that the clarification rates of suspension a and suspension B were the same, as shown in fig. 2, and the following steps were continued:
(6) according to the qualified doping amount standard of the flocculant to be detected, which is measured in the step (2), 0.1g of polyacrylamide is added into 1000g of water at the temperature of 20 ℃ to prepare a flocculant aqueous solution with standard concentration, 25g of the flocculant aqueous solution with standard concentration is measured, 0.2g of bentonite is added into the flocculant aqueous solution with standard concentration, and the mixture is stirred uniformly to obtain a suspension C;
respectively adding 1.0g, 0.01g and 0g of polyacrylamide into 1000g of water according to the method to prepare a polyacrylamide solution and a blank group, respectively measuring 25g of each of two polyacrylamide solutions with different concentrations and the blank group solution, respectively adding 0.2g of bentonite into the two polyacrylamide solutions and the blank group solution, and uniformly stirring to respectively obtain a suspension C0, a suspension C1 and a blank suspension;
(7) weighing a certain amount of 100g of sand sample containing flocculant for concrete to be detected, adding the sand sample into 100g of water, stirring for 10s, and filtering to obtain filtrate B; then adding 0.2g of bentonite into 25g of the filtrate B, and uniformly stirring to obtain a suspension D;
(8) standing the blank suspension, the suspension C1, the suspension C0 and the suspension D for 2min after oscillation to compare the clarification speeds of the suspensions, wherein the light transmittance of the four suspensions is respectively 0.7%, 1.5%, 4.6%, 11.3% and 7.8%, the light transmittance of the suspension D is higher than that of the suspension C, the clarification speed of the suspension D is higher than that of the suspension C, and as shown in figure 3, the condition that the doping amount of the sand flocculant for the concrete to be measured exceeds the qualified doping amount standard can be obtained, namely the doping amount of the sand flocculant to be measured is unqualified; meanwhile, the light transmittance of the suspension D is less than that of the suspension C0, which shows that the doping amount of the flocculant of the sand sample for the concrete to be tested is between 0.1 and 1.0 per mill.
Claims (4)
1. The method for rapidly detecting the residual quantity of the flocculating agent in the sand for the concrete comprises the following steps:
s1, preparing a concrete sample from the sand sample for the concrete to be tested, which does not contain the flocculant, and other concrete raw materials according to the process requirements, and doping the flocculant to be tested with different mass proportions into the concrete sample to prepare N groups of standard concrete to be tested, wherein N is more than or equal to 5;
s2, respectively detecting the working performance of N groups of standard concrete to be detected, and determining the qualified mixing amount standard of the flocculant to be detected according to the detection result;
s3, preparing a flocculant aqueous solution with a certain concentration by using a flocculant to be detected, measuring a g of the flocculant aqueous solution, adding b g bentonite into the flocculant aqueous solution, and stirring to disperse the bentonite into the solution to obtain a suspension A;
s4, adding a certain amount of the sand sample for the concrete to be tested, which does not contain the flocculant, into a certain amount of the flocculant aqueous solution, uniformly mixing, and filtering to obtain a filtrate A; then a g the filtrate A is measured, B g bentonite is added into the filtrate A, and the mixture is stirred to ensure that the bentonite is dispersed in the solution, thus obtaining suspension B;
s5, after the suspension A and the suspension B are oscillated and kept stand for the same time, the light transmittance of the suspension A and the light transmittance of the suspension B are tested by using a light transmittance instrument, if the difference between the light transmittance of the suspension B and the light transmittance of the suspension A is not more than 0.5 percent, S6 is carried out if the clarification speed of the suspension A is the same as that of the suspension B, otherwise, the method is stopped;
s6, preparing a flocculant aqueous solution with standard concentration according to the qualified doping amount standard of the flocculant measured in the step S2, measuring C g the flocculant aqueous solution with standard concentration, adding d g bentonite, and stirring uniformly to obtain a suspension C;
s7, measuring a certain amount of a sand sample containing a flocculating agent for the concrete to be tested, adding the sand sample into water with equal mass, uniformly stirring, and filtering to obtain a filtrate B; then adding D g bentonite into the c g filtrate B, and stirring uniformly to obtain a suspension D;
s8, oscillating the suspension C and the suspension D, standing for the same time, testing the light transmittance of the suspension C and the suspension D by using a light transmittance instrument, and if the light transmittance of the suspension D is greater than that of the suspension C, indicating that the doping amount of the flocculant of the sand sample for the concrete to be tested exceeds the qualified doping amount standard; and otherwise, if the light transmittance of the suspension D is not greater than that of the suspension C, indicating that the doping amount of the flocculant of the sand sample for the concrete to be tested does not exceed the qualified doping amount standard.
2. The method for rapidly detecting the residual amount of the flocculant in the sand for concrete according to claim 1, characterized in that: a and b are 100-150: 1.
3. The method for rapidly detecting the residual amount of the flocculant in the sand for concrete according to claim 1, characterized in that: d is 100-150: 1.
4. The method for rapidly detecting the residual amount of the flocculant in the sand for concrete according to claim 1, characterized in that: the flocculant is polyacrylamide.
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| CN114994298A (en) * | 2022-05-10 | 2022-09-02 | 中国矿业大学 | Method for detecting residual amount of flocculating agent in machine-made sand |
| CN117110198A (en) * | 2023-08-28 | 2023-11-24 | 石家庄市长安育才建材有限公司 | Method for rapidly detecting type and content of flocculant in machine-made sand |
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Cited By (5)
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| CN114965849A (en) * | 2022-05-12 | 2022-08-30 | 江苏奥莱特新材料股份有限公司 | Test powder for judging flocculant in washed sand and judging method |
| CN114965849B (en) * | 2022-05-12 | 2023-08-29 | 江苏奥莱特新材料股份有限公司 | Test powder for judging existence of flocculant in water-washed sand and judging method |
| CN117110198A (en) * | 2023-08-28 | 2023-11-24 | 石家庄市长安育才建材有限公司 | Method for rapidly detecting type and content of flocculant in machine-made sand |
| CN117110198B (en) * | 2023-08-28 | 2024-04-12 | 石家庄市长安育才建材有限公司 | Method for rapidly detecting type and content of flocculant in machine-made sand |
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