CN114414426A - Method for measuring slurry wrapping degree on surface of reclaimed sand - Google Patents
Method for measuring slurry wrapping degree on surface of reclaimed sand Download PDFInfo
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- CN114414426A CN114414426A CN202111635368.1A CN202111635368A CN114414426A CN 114414426 A CN114414426 A CN 114414426A CN 202111635368 A CN202111635368 A CN 202111635368A CN 114414426 A CN114414426 A CN 114414426A
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- China
- Prior art keywords
- reclaimed sand
- sand
- reclaimed
- slurry
- salicylic acid
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- 239000004576 sand Substances 0.000 title claims abstract description 112
- 239000002002 slurry Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 155
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 34
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 24
- 239000000377 silicon dioxide Substances 0.000 claims description 23
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 17
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 claims description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 15
- 238000001035 drying Methods 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
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims description 8
- 229960004889 salicylic acid Drugs 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000000967 suction filtration Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 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
- 238000005406 washing Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000000126 substance Substances 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 3
- 239000004568 cement Substances 0.000 description 15
- 235000012239 silicon dioxide Nutrition 0.000 description 8
- 238000004090 dissolution Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- -1 apparent density Chemical compound 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 238000007922 dissolution test Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
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- 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
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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)
- 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 slurry wrapping degree of a reclaimed sand surface, which relates to the technical field of resource recycling of waste concrete.
Description
The technical field is as follows:
the invention relates to the technical field of resource recycling of waste concrete, in particular to a method for measuring the slurry wrapping degree of the surface of reclaimed sand.
Background art:
concrete, which is the most used building material for human beings, plays an irreplaceable role and is expected to be used in large quantities in the future. With the rapid increase of the consumption of concrete, natural resources such as natural sand are less and less, so that the resource recycling of waste concrete becomes a hot spot. The surface of the reclaimed sand obtained after the waste concrete is crushed is wrapped with residual slurry, and the residual slurry seriously influences the performance of the reclaimed sand, so that the engineering application of the reclaimed sand of the waste concrete is limited.
In recent years, researchers have made relatively intensive studies on recycled coarse aggregates, but relatively few studies have been made on recycled sand. Researches show that the existence of cement hardened slurry on the surface of the reclaimed sand seriously affects the basic performances of the reclaimed sand, such as apparent density, water absorption, crushing index and the like, so that the working performance and the mechanical property of concrete prepared by utilizing the reclaimed sand and products thereof are poor. Currently, the types of reclaimed sand mainly include reclaimed sand using limestone as raw sand (such as machine-made sand) and siliceous reclaimed sand using river sand as raw sand, however, a quantitative test method for cement hardened slurry on the surface of the reclaimed sand is not established, people are difficult to accurately predict the performance of the reclaimed sand and concrete prepared from the reclaimed sand, and differential application of the reclaimed sand cannot be realized.
The invention content is as follows:
the invention aims to solve the technical problem of providing a method for measuring the slurry wrapping degree on the surface of reclaimed sand so as to overcome the defects of the prior art.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a method for measuring the slurry wrapping degree of the surface of reclaimed sand comprises the following steps:
(1) for reclaimed sand containing calcium carbonate and silica as main components:
drying the reclaimed sand to constant weight, cooling and grinding the reclaimed sand into powder with the particle size of less than 0.2 mm;
dissolving salicylic acid in anhydrous methanol to obtain salicylic acid methanol solution;
weight m is taken1Pouring the reclaimed sand powder into a salicylic acid methanol solution, and stirring to fully react;
weighing the mass of the filter paper, performing suction filtration after the reaction is finished, and cleaning the filter paper for several times by using anhydrous methanol 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 remaining sample after drying was weighed and recorded as m2；
Calculating the slurry wrapping degree of the reclaimed sand by using a formula (1);
(2) for reclaimed sand containing silica as a main component:
drying the reclaimed sand to constant weight;
weight m is taken1The reclaimed sand is put into dilute hydrochloric acid solution and stirred to fully react;
washing with clear water for several times to remove redundant hydrochloric acid and avoid sample loss;
the residual insoluble solid was dried to constant weight and weighed, and recorded as m2；
And (3) calculating the slurry wrapping degree of the reclaimed sand by using the formula (1).
Research shows that the salicylic acid methanol solution can selectively dissolve hardened cement slurry in reclaimed sand which takes calcium carbonate and silicon dioxide as main components, but hardly dissolves calcium carbonate in raw sand; the dilute hydrochloric acid dissolution method dissolves hardened cement paste on the surface of reclaimed sand containing silica as a main component, but does not dissolve raw sand.
Research shows that the surface slurry wrapping degree of the reclaimed sand can be defined as the ratio of the mass of the cement hardened slurry to the mass of the raw sand in the reclaimed sand, and the formula can be expressed as follows:
in the formula:
in order to regenerate the wrapping degree of the slurry on the surface of the sand,m1for the mass of reclaimed sand, m2The quality of the raw sand in the reclaimed sand is shown.
The invention has the beneficial effects that:
(1) the invention adopts different testing methods for the reclaimed sand with different main components respectively, thereby improving the accuracy.
(2) The test 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 (crude sand is limestone) with calcium carbonate and silica as main components;
fig. 2 is an XRD detection result of reclaimed sand (raw sand is river sand) containing silica as a main component;
FIG. 3 is a block diagram of a process for treating reclaimed sand (crude sand is limestone) containing calcium carbonate and silica as main components with a methanol solution of salicylic acid;
fig. 4 is a block diagram showing a flow of treating reclaimed sand (raw sand is river sand) mainly composed of silica with a dilute hydrochloric acid solution.
The specific implementation mode is as follows:
in order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments and the drawings.
Fig. 3 shows a process of treating reclaimed sand containing calcium carbonate and silica as main components, and fig. 4 shows a process of treating reclaimed sand containing silica as a main component.
Example 1 (reclaimed sand containing calcium carbonate and silica as main components)
Taking reclaimed sand with the grain diameter of 0.6-1.18mm, wherein the main components of the reclaimed sand are calcium carbonate and silicon dioxide (XRD analysis result is shown in figure 1), drying the reclaimed sand in an oven at 105 ℃ to constant weight, cooling and grinding the reclaimed sand into powder with the grain diameter of less than 0.2 mm.
14g of salicylic acid was dissolved in 80ml of anhydrous methanol to prepare a methanol solution of salicylic acid.
0.5g of ground reclaimed sand powder (recorded as m) was taken1) Pouring into the above solution, stirring continuously and waiting for 1 hrIt is reacted sufficiently.
Weighing the mass of the filter paper, performing suction filtration by using a small vacuum pump suction filtration device after the reaction is finished, and cleaning by using anhydrous methanol for several times to remove redundant salicylic acid.
The filter paper containing the remaining material was taken out and placed in a glass dish and dried in an oven at 45 ℃ for 10 min.
The mass of the remaining material after drying was weighed and recorded as m2。
And (3) calculating the surface slurry wrapping degree of the reclaimed sand by using the formula (1).
In this example, 3 kinds of reclaimed sand were selected, and 4 samples of reclaimed sand of each kind of grain were tested to obtain 12 sets of data, as shown in table 1.
Example 2 (reclaimed sand containing silica as the main component)
The reclaimed sand with a certain particle size of 0.6-1.18mm, the main component of which is silicon dioxide (XRD analysis result is shown in figure 2), and the raw sand is river sand, and the reclaimed sand is dried in a 105 ℃ oven to constant weight.
Sample 50g of reclaimed sand (recorded as m)1) Placing the mixture into a dilute hydrochloric acid solution with the concentration of 30%, and stirring the mixture to fully react.
The excess hydrochloric acid is removed by washing with clear water for several times without loss of small particles.
The residual insoluble solid was dried to constant weight and weighed, and recorded as m2。
And (3) calculating the slurry wrapping degree of the reclaimed sand by using the formula (1).
In this example, 3 kinds of reclaimed sand were selected, and 4 samples of reclaimed sand of each kind of grain were tested to obtain 12 sets of data, as shown in table 1.
TABLE 1 reclaimed sand surface slurry packing test results
Method verification
The reclaimed sand mainly comprises calcium carbonate and silicon dioxide, and the main components of the reclaimed sand comprise cement paste and machine-made sand (the components mainly comprise calcium carbonate and silicon dioxide). Therefore, the cement slurry powder, the calcium carbonate powder and the natural sand powder are respectively placed in a salicylic acid methanol solution, and the dissolution rate of each component in the solution is analyzed to verify the slurry wrapping degree test method of the reclaimed sand using calcium carbonate and silicon dioxide as main components.
Table 2 shows the results of the solubility tests of the cement paste, calcium carbonate and natural sand in the methanol salicylic acid solution, and it can be seen that the solubility of the cement paste is 95% and the solubility of the calcium carbonate and natural sand is only 4% and 2%, which indicates that the methanol salicylic acid solution can dissolve the cement paste in the reclaimed sand containing calcium carbonate and silica as main components and not the machine-made sand (containing calcium carbonate and silica as main components) in the reclaimed sand.
Table 2 dissolution rate test results of each component in reclaimed sand in solution
The reclaimed sand with silicon dioxide as the main component comprises cement paste and natural sand as the main components. Therefore, the cement slurry 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 slurry wrapping degree test method of the reclaimed sand taking silicon dioxide as a main component.
Table 3 shows the results of the test of the dissolution rates of the cement paste and the natural sand in the dilute hydrochloric acid solution, and it can be seen 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 dilute hydrochloric acid solution can sufficiently dissolve the cement paste in the reclaimed sand without dissolving the original sand in the reclaimed sand.
TABLE 3 dissolution test results of each component in reclaimed sand in solution
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A method for measuring the slurry wrapping degree of the surface of reclaimed sand is characterized by comprising the following steps:
(1) for reclaimed sand containing calcium carbonate and silica as main components:
drying the reclaimed sand to constant weight, cooling and grinding the reclaimed sand into powder with the particle size of less than 0.2 mm;
dissolving salicylic acid in anhydrous methanol to obtain salicylic acid methanol solution;
weight m is taken1Pouring the reclaimed sand powder into a salicylic acid methanol solution, and stirring to fully react;
weighing the mass of the filter paper, performing suction filtration after the reaction is finished, and cleaning the filter paper for several times by using anhydrous methanol 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 remaining sample after drying was weighed and recorded as m2；
Calculating the slurry wrapping degree of the reclaimed sand by using a formula (1);
(2) for reclaimed sand containing silica as a main component:
drying the reclaimed sand to constant weight;
weight m is taken1The reclaimed sand is put into dilute hydrochloric acid solution and stirred to fully react;
washing with clear water for several times to remove redundant hydrochloric acid and avoid sample loss;
the residual insoluble solid was dried to constant weight and weighed, and recorded as m2；
Calculating the slurry wrapping degree of the reclaimed sand by using a formula (1);
in the formula:
m is the wrapping degree of slurry on the surface of the reclaimed sand1For the mass of reclaimed sand, m2The quality of the raw sand in the reclaimed sand is shown.
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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 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 |
|---|
| 杨宁;王崇革;赵美霞;: "再生骨料强化技术研究", 新型建筑材料, no. 03 * |
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