CN114414426B - Method for measuring packing degree of slurry on surface of reclaimed sand - Google Patents
Method for measuring packing degree of slurry on surface of reclaimed sand Download PDFInfo
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- CN114414426B CN114414426B CN202111635368.1A CN202111635368A CN114414426B CN 114414426 B CN114414426 B CN 114414426B CN 202111635368 A CN202111635368 A CN 202111635368A CN 114414426 B CN114414426 B CN 114414426B
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- China
- Prior art keywords
- reclaimed sand
- sand
- slurry
- reclaimed
- salicylic acid
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- 239000004576 sand Substances 0.000 title claims abstract description 105
- 239000002002 slurry Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000012856 packing Methods 0.000 title claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 149
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 34
- 239000000377 silicon dioxide Substances 0.000 claims description 23
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 21
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 15
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 claims description 14
- 235000012239 silicon dioxide Nutrition 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- GAISRYMZAXLPHD-UHFFFAOYSA-N 2-hydroxybenzoic acid;methanol Chemical compound OC.OC(=O)C1=CC=CC=C1O GAISRYMZAXLPHD-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims description 7
- 229960004889 salicylic acid Drugs 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000000967 suction filtration Methods 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 9
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000004568 cement Substances 0.000 description 15
- 238000004090 dissolution Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- OSWPMRLSEDHDFF-UHFFFAOYSA-N methyl salicylate Chemical compound COC(=O)C1=CC=CC=C1O OSWPMRLSEDHDFF-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007581 slurry coating method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- 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)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a method for measuring the wrapping degree of slurry on the surface of reclaimed sand, which relates to the technical field of recycling of waste concrete.
Description
Technical field:
the invention relates to the technical field of recycling of waste concrete, in particular to a method for measuring the wrapping degree of slurry on the surface of reclaimed sand.
The background technology is as follows:
concrete, which plays an irreplaceable role as a building material most used by humans, is expected to be used in large quantities in the future. With the rapid increase of concrete usage, natural resources such as natural sand are reduced, so that the resource reuse of waste concrete becomes a hot spot. The recycled sand obtained after the waste concrete is crushed is coated with residual slurry, and the residual slurry seriously affects the performance of the recycled sand, so that the engineering application of the recycled sand of the waste concrete is limited.
In recent years, the study of recycled coarse aggregate by the scholars has been relatively sufficient, but the study of recycled sand has been relatively few. Research shows that the existence of the cement hardening slurry on the surface of the reclaimed sand seriously influences the apparent density, the water absorption, the crushing index and other basic properties of the reclaimed sand, so that the working performance and the mechanical property of the concrete prepared by the reclaimed sand and products thereof are poor. At present, the types of reclaimed sand mainly comprise reclaimed sand taking limestone as raw sand (such as machine-made sand) and siliceous reclaimed sand taking river sand as raw sand, however, a quantitative test method of cement hardening slurry on the surface of the reclaimed sand is not established yet, and people cannot accurately predict the performance of the reclaimed sand and concrete prepared by the reclaimed sand, and cannot realize the differentiated application of the reclaimed sand.
The invention comprises the following steps:
the invention aims to provide a method for measuring the packing degree of slurry on the surface of reclaimed sand so as to overcome the defects in the prior art.
The technical problems to be solved by the invention are realized by adopting the following technical scheme:
a method for determining the degree of packing of a slurry on a reclaimed sand surface comprising the steps of:
(1) For reclaimed sand with calcium carbonate and silicon dioxide as main components:
drying the reclaimed sand to constant weight, cooling and grinding into powder with the particle size smaller than 0.2 mm;
dissolving salicylic acid in anhydrous methanol to obtain salicylic acid methanol solution;
weight m is taken 1 Pouring the reclaimed sand powder into a salicylic acid methanol solution, and stirring to fully react;
weighing the mass of filter paper, carrying out suction filtration after the reaction is finished, and washing with absolute methanol for a plurality of times to remove redundant salicylic acid;
taking out the filter paper containing the residual substances, placing the filter paper in a glass dish, and drying;
the mass of the dried residual sample was weighed and recorded as m 2 ；
Calculating the slurry wrapping degree of the reclaimed sand by using a formula (1);
(2) For reclaimed sand with silica as the main component:
drying the reclaimed sand to constant weight;
weight m is taken 1 The reclaimed sand of (2) is placed in a dilute hydrochloric acid solution and stirred to fully reverseThe reaction is carried out;
washing with clear water for several times to remove excessive hydrochloric acid and avoid sample loss;
the residual solid insoluble matter was dried to constant weight and then weighed and recorded as m 2 ；
And (3) calculating the slurry wrapping degree of the reclaimed sand by using the formula (1).
Studies have shown that the methanol salicylate solution can selectively dissolve hardened cement paste in reclaimed sand with calcium carbonate and silicon dioxide as main components, but hardly dissolve calcium carbonate in the raw sand; the dilute hydrochloric acid dissolution method can dissolve the hardened cement paste on the surface of the reclaimed sand containing silica as a main component, without dissolving the raw sand.
Studies have shown that the surface slurry packing degree of reclaimed sand can be defined as the ratio of the mass of cement hardened slurry to the mass of raw sand in reclaimed sand, and can be expressed as:
wherein:for the packing degree of the regenerated sand surface slurry, m 1 M is the quality of the reclaimed sand 2 Is the quality of the raw sand in the reclaimed sand.
The beneficial effects of the invention are as follows:
(1) According to the invention, different testing methods are respectively adopted for the reclaimed sand with different main components, so that the accuracy is improved.
(2) The testing method is simple and easy to operate, and the result is accurate and reliable.
Description of the drawings:
fig. 1 is an XRD detection result of reclaimed sand (raw sand is limestone) containing calcium carbonate and silica as main components;
fig. 2 shows XRD detection results of reclaimed sand (river sand as raw sand) containing silica as a main component;
FIG. 3 is a block flow diagram of a process for treating reclaimed sand (the raw sand is limestone) containing calcium carbonate and silicon dioxide as main components with a methanol solution of salicylic acid;
fig. 4 is a flow chart of a process for treating reclaimed sand (raw sand is river sand) containing silica as a main component with a dilute hydrochloric acid solution.
The specific embodiment is as follows:
the invention is further described below with reference to specific embodiments and illustrations in order to make the technical means, the creation features, the achievement of the purpose and the effect of the implementation of the invention easy to understand.
Fig. 3 shows a process of treating reclaimed sand mainly composed of calcium carbonate and silica, and fig. 4 shows a process of treating reclaimed sand mainly composed of silica.
Example 1 (reclaimed sand having calcium carbonate and silica as the main components)
Taking regenerated sand with particle size of 0.6-1.18mm, mainly comprising calcium carbonate and silicon dioxide (XRD analysis result is shown in figure 1), oven drying at 105deg.C to constant weight, cooling, and grinding to powder with particle size of less than 0.2 mm.
14g of salicylic acid was dissolved in 80ml of absolute methanol to prepare a methanol salicylic acid solution.
0.5g of the crushed reclaimed sand powder (recorded as m 1 ) Pouring the mixture into the solution, continuously stirring the mixture and waiting for 1h to fully react the mixture.
The filter paper mass is weighed, after the reaction is completed, a small vacuum pump is used for filtering, and anhydrous methanol is used for cleaning for a plurality of times to remove the superfluous salicylic acid.
The filter paper containing the remaining material was removed and placed in a glass dish and dried in an oven at 45℃for 10min.
Weighing the mass of the residual substances after drying, and recording as m 2 。
And (3) calculating the surface slurry coating degree of the reclaimed sand by using the formula (1).
In this example, 3 kinds of reclaimed sand in each grain segment were selected, and 4 samples were tested for each grain segment, and 12 sets of data were obtained in total, as shown in table 1.
Example 2 (reclaimed sand having silica as a main component)
The main component of the reclaimed sand with the grain diameter of 0.6-1.18mm is silicon dioxide (XRD analysis result is shown in figure 2), the raw sand is river sand, and the river sand is dried in an oven at 105 ℃ to constant weight.
50g of reclaimed sand (recorded as m) 1 ) Placed in 30% dilute hydrochloric acid solution, and stirred to react thoroughly.
The excessive hydrochloric acid is removed by washing with clear water for several times, and no small particles are lost.
The residual solid insoluble matter was dried to constant weight and then weighed and recorded as m 2 。
And (3) calculating the slurry wrapping degree of the reclaimed sand by using the formula (1).
In this example, 3 kinds of reclaimed sand in each grain segment were selected, and 4 samples were tested for each grain segment, and 12 sets of data were obtained in total, as shown in table 1.
TABLE 1 regenerated sand surface slurry packing degree test results
Method verification
The regenerated sand mainly comprises calcium carbonate and silicon dioxide, and the main components of the regenerated sand comprise cement paste and machine-made sand (mainly comprising the calcium carbonate and the silicon dioxide). Therefore, cement paste powder, calcium carbonate powder and natural sand powder were respectively placed in a salicylic acid methanol solution, and the dissolution rates of the respective components in the solution were analyzed to verify a paste inclusion degree test method of reclaimed sand having calcium carbonate and silica as main components.
Table 2 shows the results of the dissolution rate test of cement paste, calcium carbonate and natural sand in the salicylic acid methanol solution, and it is known that the dissolution rate of cement paste is 95% and the dissolution rates of calcium carbonate and natural sand are only 4% and 2%, which indicates that the salicylic acid methanol solution can dissolve cement paste in reclaimed sand having calcium carbonate and silica as main components, but not machine-made sand in reclaimed sand (having calcium carbonate and silica as main components).
TABLE 2 results of solubility test of the components in solution in reclaimed sand
The regenerated sand with silicon dioxide as main component includes cement slurry and natural sand as main components. Therefore, the cement paste and the natural sand are respectively placed in a dilute hydrochloric acid solution, and the dissolution rate of each component in the dilute hydrochloric acid is analyzed to verify the paste inclusion degree test method of the reclaimed sand taking silicon dioxide as a main component.
Table 3 shows the results of the dissolution rate test of the cement paste and the natural sand in the diluted hydrochloric acid solution, and shows that the dissolution rate of the cement paste is 98% and the dissolution rate of the natural sand is only 2%, which indicates that the diluted hydrochloric acid solution can sufficiently dissolve the cement paste in the reclaimed sand and not dissolve the raw sand in the reclaimed sand.
TABLE 3 results of dissolution rate test of each component in reclaimed sand in solution
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A method for determining the packing degree of a slurry on the surface of reclaimed sand, comprising the steps of:
(1) For reclaimed sand with calcium carbonate and silicon dioxide as main components:
drying the reclaimed sand to constant weight, cooling and grinding into powder with the particle size smaller than 0.2 mm;
dissolving salicylic acid in anhydrous methanol to obtain salicylic acid methanol solution;
weight m is taken 1 Pouring the reclaimed sand powder into a salicylic acid methanol solution, and stirring to fully react;
weighing the mass of filter paper, carrying out suction filtration after the reaction is finished, and washing with absolute methanol for a plurality of times to remove redundant salicylic acid;
taking out the filter paper containing the residual substances, placing the filter paper in a glass dish, and drying;
the mass of the dried residual sample was weighed and recorded as m 2 ；
Calculating the slurry wrapping degree of the reclaimed sand by using a formula (1);
(2) For reclaimed sand with silica as the main component:
drying the reclaimed sand to constant weight;
weight m is taken 1 Placing the reclaimed sand in a dilute hydrochloric acid solution, and stirring to fully react;
washing with clear water for several times to remove excessive hydrochloric acid and avoid sample loss;
the residual solid insoluble matter was dried to constant weight and then weighed and recorded as m 2 ；
Calculating the slurry wrapping degree of the reclaimed sand by using a formula (1);
wherein:for the packing degree of the regenerated sand surface slurry, m 1 M is the quality of the reclaimed sand 2 Is the quality of the raw sand in the reclaimed sand.
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| CN202111635368.1A CN114414426B (en) | 2021-12-29 | 2021-12-29 | Method for measuring packing degree of slurry on surface of reclaimed sand |
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| CN202111635368.1A CN114414426B (en) | 2021-12-29 | 2021-12-29 | Method for measuring packing degree of slurry on surface of reclaimed sand |
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| CN114414426B true CN114414426B (en) | 2024-02-09 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007335A (en) * | 2006-01-23 | 2007-08-01 | 沈阳汇亚通铸造材料有限责任公司 | Ester curing type sand binder for casting and its preparation method |
| CN102269682A (en) * | 2011-05-12 | 2011-12-07 | 湖南大学 | Method for detecting mineral admixtures in freshly mixed cement paste, mortar and concrete |
| DE102011075630A1 (en) * | 2011-05-11 | 2012-11-15 | Bayerische Motoren Werke Aktiengesellschaft | Method for testing quality of reclaimed sand circulated in foundry sand core and sand mold for forming cavity in molded product, involves determining ratio of fraction and entire portion of water and glass binder in reclaimed sand |
| CN103822848A (en) * | 2014-03-18 | 2014-05-28 | 哈尔滨工业大学 | Method for backcasting original mixing ratio of early-age hardened concrete |
| CN106124356A (en) * | 2016-06-14 | 2016-11-16 | 华电莱州发电有限公司 | Dioxide-containing silica abbreviated analysis method in limestone |
| CN107607434A (en) * | 2017-09-15 | 2018-01-19 | 湖南军信环保股份有限公司 | A kind of sludge sand content detection method |
| CN112605336A (en) * | 2020-11-30 | 2021-04-06 | 襄阳仁创铸造材料有限公司 | Preparation method and application of reclaimed sand for casting cold core |
-
2021
- 2021-12-29 CN CN202111635368.1A patent/CN114414426B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007335A (en) * | 2006-01-23 | 2007-08-01 | 沈阳汇亚通铸造材料有限责任公司 | Ester curing type sand binder for casting and its preparation method |
| DE102011075630A1 (en) * | 2011-05-11 | 2012-11-15 | Bayerische Motoren Werke Aktiengesellschaft | Method for testing quality of reclaimed sand circulated in foundry sand core and sand mold for forming cavity in molded product, involves determining ratio of fraction and entire portion of water and glass binder in reclaimed sand |
| CN102269682A (en) * | 2011-05-12 | 2011-12-07 | 湖南大学 | Method for detecting mineral admixtures in freshly mixed cement paste, mortar and concrete |
| CN103822848A (en) * | 2014-03-18 | 2014-05-28 | 哈尔滨工业大学 | Method for backcasting original mixing ratio of early-age hardened concrete |
| CN106124356A (en) * | 2016-06-14 | 2016-11-16 | 华电莱州发电有限公司 | Dioxide-containing silica abbreviated analysis method in limestone |
| CN107607434A (en) * | 2017-09-15 | 2018-01-19 | 湖南军信环保股份有限公司 | A kind of sludge sand content detection method |
| CN112605336A (en) * | 2020-11-30 | 2021-04-06 | 襄阳仁创铸造材料有限公司 | Preparation method and application of reclaimed sand for casting cold core |
Non-Patent Citations (1)
| Title |
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| 再生骨料强化技术研究;杨宁;王崇革;赵美霞;;新型建筑材料(第03期);全文 * |
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