CN114509367A - Method for rapidly detecting powder content of sand for concrete - Google Patents
Method for rapidly detecting powder content of sand for concrete Download PDFInfo
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- CN114509367A CN114509367A CN202111681853.2A CN202111681853A CN114509367A CN 114509367 A CN114509367 A CN 114509367A CN 202111681853 A CN202111681853 A CN 202111681853A CN 114509367 A CN114509367 A CN 114509367A
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- 239000004576 sand Substances 0.000 title claims abstract description 110
- 239000000843 powder Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000007789 sealing Methods 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000011049 filling Methods 0.000 claims abstract description 7
- 239000012780 transparent material Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 10
- 230000003116 impacting effect Effects 0.000 abstract description 3
- 239000004927 clay Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000000926 separation method 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
- 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
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Abstract
The invention discloses a method for rapidly detecting the powder content of sand for concrete, which comprises the following steps: s1, taking a sand sample for concrete, and dividing the sand sample into two parts, wherein one part adopts the method in GB/T14684 to detect the powder content; s2, adding the other part into a sealing tube, impacting the sealing tube to achieve a dense filling state, and adding water; then, sealing, then shaking the sealing tube, standing until a clear aggregate layer and a powder layer are formed in the sealing tube, and then measuring the height of the aggregate layer and the height of the powder layer in the sealing tube; s3, repeating the step S1 and the step S2 for N times by taking different sand samples for concrete from the same region; s4, determining the relation between the two values according to the N groups of 'actual values' and 'proportional values' obtained by the method, listing out the relation, substituting the 'proportional values' to calculate the powder content of different concrete sand samples from the same area. The advantages are that: the rapid detection of the content of the mud powder in the sand for the concrete can be realized, and the detection result is accurate.
Description
Technical Field
The invention relates to a method for detecting the powder content in sand, in particular to a method for detecting the powder content in machine-made sand for concrete.
Background
Concrete is one of the important raw materials of modern buildings, aggregates in the raw materials of the concrete occupy a great part of specific gravity, and particularly, various parameter indexes of a sand sample for the concrete have great influence on the performance of the concrete, particularly, the content of mud powder in the sand sample for the concrete has obvious influence on the mixing amount, the fluidity and the like of a concrete additive.
At present, the content of mud powder of concrete sand is mainly detected by a detection scheme in GB/T14684, but the method is more complicated in detection, and is not convenient for quickly determining the powder content of the concrete sand in occasions where a large amount of samples are needed to be detected. Therefore, the parameter of the powder content in the aggregate is obtained quickly, and the parameter has a positive effect on the adjustment of the production mixing proportion of the concrete.
Disclosure of Invention
The invention provides a method for quickly detecting the powder content of concrete sand, which aims to realize quick determination of the powder content of the concrete sand.
The technical scheme adopted by the invention is as follows: the method for rapidly detecting the powder content of the sand for concrete comprises the following steps:
s1, taking a sand sample for concrete, dividing the sand sample into two parts, wherein one part adopts the method in GB/T14684 to detect the powder content, and recording the result as an actual value;
s2, adding the other part into a sealing pipe, enabling the sand sample for concrete to reach a dense filling state by shocking the sealing pipe, enabling the sand sample for concrete to be filled to be H cm in height, and adding water to enable the water surface to reach H cm in height; wherein H is 10-20, and H-H is 3-5; then, the sealing pipe is shaken after sealing, water and concrete are fully contacted and uniformly mixed by using a sand sample, then the sealing pipe is vertically placed on a horizontal plane, after a clear aggregate layer and a powder layer are formed in the sealing pipe by standing, the height of the aggregate layer and the height of the powder layer in the sealing pipe are measured, the ratio of the height of the powder layer to the height of the aggregate layer is calculated, and the result is recorded as a 'proportional value';
s3, repeating the step S1 and the step S2 for N times by taking different sand samples for concrete from the same area to obtain N groups of actual values and proportional values, wherein N is more than or equal to 10;
s4, determining the relation between the two values according to the N groups of 'actual values' and 'proportional values' obtained by the method, listing a relational expression, and substituting the 'proportional values' according to the relational expression to calculate the powder content of different concrete sand samples from the same area.
The method in GB/T14684 specifically comprises the following steps:
(1) placing the sample in an oven at 105 + -5 deg.C, drying to constant weight, cooling to room temperature, and weighing 400g (m)0) The sample is ready for use;
(2) putting the dried sample in a container, injecting drinking water until the water surface is about 150mm higher than the sand surface, soaking for 2h after fully stirring, and then elutriating the sample in water to separate dust, silt and clay from sand grains and make the dust, silt and clay suspended or dissolved in the water. Slowly pouring the turbid liquid into a square hole sleeve sieve (1.25mm sieve is placed on the sieve) with the nominal diameter of 1.25mm and the diameter of 80 μm, filtering out particles smaller than 80 μm, wetting two surfaces of the sieve with water before the test, and avoiding sand loss in the whole test process;
(3) adding water into the container again, and repeating the above process until the water washed out from the barrel is clear;
(4) the remaining fines on the sieve were rinsed with water and the 80 μm sieve was shaken back and forth in water (sleeping slightly above the upper surface of the sand grains in the sieve) to thoroughly wash off particles smaller than 80 μm, and dried to constant weight in an oven at a temperature of (105 ± 5) ° c. Taken out, cooled to room temperature, and weighed to obtain a sample mass (m)1)；
(5) The powder content was calculated according to the following formula:
W＝(m1-m0)/m0×100％。
as will be readily understood by those skilled in the art, the term "originating from the same region" as used herein means that the same area of origin is the same as the area of origin of the concrete sand sample.
As a further improvement of the invention, the sealing tube is a cylindrical tube made of transparent materials, the inner diameter of the tube is 1.5-3 cm, and the length-diameter ratio is 6-10: 1. The size and the length-diameter ratio of the sealing pipe have a key effect on the separation effect of the sand powder, a thin pipe with a large length-diameter ratio is selected, the water and the sand sample for the concrete are not favorably in full contact, a thick pipe with a small length-diameter ratio is selected, the height of a separated powder layer area is not obvious, and a large amount of sand samples for the concrete need to be filled; therefore, it is preferable to select the size and aspect ratio of the sealed tube in this embodiment. Preferably, the pipe wall of the sealing pipe is provided with a graduated scale so as to facilitate rapid measurement.
As a further improvement of the invention, the standing time in step S2 is at least 20 min.
The invention has the beneficial effects that: the rapid detection of the content of the mud powder in the sand for the concrete can be realized, and the detection result is accurate.
Detailed Description
The present invention will be further described with reference to the following examples.
Example (b):
the content of the mud powder in the sand sample 1 for concrete was measured as follows:
A. taking a sand sample for concrete, dividing the sand sample into two parts, wherein one part adopts a method in GB/T14684 to detect the powder content, and the specific method is as follows:
(1) placing the sample in an oven at 105 + -5 deg.C, drying to constant weight, cooling to room temperature, and weighing 400g (m)0) The sample is ready for use;
(2) putting the dried sample in a container, injecting drinking water until the water surface is about 150mm higher than the sand surface, soaking for 2h after fully stirring, and then elutriating the sample in water to separate dust, silt and clay from sand grains and make the dust, silt and clay suspended or dissolved in the water. Slowly pouring the turbid liquid into a square hole sleeve sieve (1.25mm sieve is placed on the sieve) with the nominal diameter of 1.25mm and the diameter of 80 μm, filtering out particles smaller than 80 μm, wetting two surfaces of the sieve with water before the test, and avoiding sand loss in the whole test process;
(3) adding water into the container again, and repeating the above process until the water washed out from the barrel is clear;
(4) the remaining fines on the sieve were rinsed with water and the 80 μm sieve was shaken back and forth in water (sleeping slightly above the upper surface of the sand grains in the sieve) to thoroughly wash off particles smaller than 80 μm, and dried to constant weight in an oven at a temperature of (105 ± 5) ° c. Taken out, cooled to room temperature, and weighed to obtain a sample mass (m)1)；
(5) The powder content was calculated according to the following formula:
W＝(m1-m0)/m0x 100%, the measured powder content is shown in Table 1.
B. Adding the other part into a sealing pipe, impacting the sealing pipe to enable the sand sample for concrete to reach a compact filling state, filling the sand sample for concrete to be 15cm in height, and adding water to enable the water surface to reach 18cm in height; then, the sealing pipe is shaken after sealing, so that water and concrete are fully contacted and uniformly mixed by using a sand sample, then the sealing pipe is vertically placed on a horizontal plane, standing is carried out for 30min, after a clear aggregate layer and a powder layer are formed in the sealing pipe, the height of the aggregate layer and the height of the powder layer in the sealing pipe are measured, the ratio of the height of the powder layer to the height of the aggregate layer is calculated, and the result is recorded as a 'proportional value'; the results are shown in Table 1. The sealing tube is a cylindrical tube made of transparent materials, a graduated scale is arranged on the tube wall, the inner diameter of the tube is 2.6cm, and the length-diameter ratio is 8: 1.
C. Taking a concrete sand sample 2, a concrete sand sample 3, a concrete sand sample 4, a concrete sand sample 5, a concrete sand sample 6, a concrete sand sample 7, a concrete sand sample 8, a concrete sand sample 9, a concrete sand sample 10, a concrete sand sample 11 and a concrete sand sample 12 which are from the same area as the concrete sand sample A, respectively, repeatedly carrying out the detection of the step A and the step B to obtain corresponding actual values and proportional values, and the results are shown in a table 1.
TABLE 1 table of "actual value" and "proportional value" test results of sand samples for concrete
| Sample numbering | Ratio value (%) | Actual value (%) |
| Sand sample for concrete 1 | 1.90 | 0.6 |
| Sand sample 2 for concrete | 2.73 | 1.8 |
| Sand sample for concrete 3 | 3.57 | 2.4 |
| Sand sample for concrete 4 | 4.46 | 3.8 |
| Sand sample for concrete 5 | 5.41 | 5.0 |
| Sand sample for concrete 6 | 6.36 | 5.9 |
| Sand sample 7 for concrete | 7.48 | 6.9 |
| Sand sample for concrete 8 | 8.57 | 7.9 |
| Sand sample 9 for concrete | 9.09 | 10.2 |
| Sand sample for concrete 10 | 10.28 | 11.7 |
| Sand sample for concrete 11 | 11.80 | 13.1 |
| Sand sample for concrete 12 | 12.08 | 14.2 |
D. The relationship between the two values is determined from the above table "actual value" and "proportional value" and the relation (1) is listed:
y＝269.17x2+92.096x-1.0749 (1)
E. the method is used for detecting the content of the mud powder of the sand sample 13 for the concrete according to the above formula, and comprises the following specific steps:
adding a sample into a sealing pipe, impacting the sealing pipe to enable a sand sample for concrete to reach a compact filling state, filling the sand sample for concrete to be 15cm in height, and adding water to enable the water surface to reach 18cm in height; then, the sealing pipe is shaken after sealing, so that water and concrete are fully contacted and uniformly mixed by using a sand sample, then the sealing pipe is vertically placed on a horizontal plane, standing is carried out for 30min, after a clear aggregate layer and a powder layer are formed in the sealing pipe, the height of the aggregate layer and the height of the powder layer in the sealing pipe are measured, the ratio of the height of the powder layer to the height of the aggregate layer is calculated, and the result is recorded as a 'proportional value'; the results are shown in Table 1. The sealing tube is a cylindrical tube made of transparent materials, a graduated scale is arranged on the tube wall, the inner diameter of the tube is 2.6cm, and the length-diameter ratio is 8: 1.
The measured "proportional value" is taken as x in the formula (1), the calculated y value is the content of the mud powder in the sand sample for concrete 13, and the result obtained by calculation is recorded as a "calculated value" and is shown in table 2.
F. Another part of the sand sample 13 for concrete is taken to detect the powder content according to the method in the GB/T14684, and the result is compared with the calculated value to verify the accuracy of the detection result of the method, and the result is shown in the table 2.
G. The above-mentioned steps E and F were repeated to obtain a concrete sand sample 14, a concrete sand sample 15, a concrete sand sample 16, a concrete sand sample 17, a concrete sand sample 18 and a concrete sand sample 19, wherein the concrete sand sample 13, the concrete sand sample 14, the concrete sand sample 15, the concrete sand sample 16 and the concrete sand sample 1 were derived from the same region, and the concrete sand sample 17, the concrete sand sample 18, the concrete sand sample 19 and the concrete sand sample 1 were derived from different regions. Corresponding "proportional values" were obtained and the difference between the "actual value" and the "calculated value" was calculated, the results are shown in table 2.
TABLE 2 Sand sample detection accuracy comparison table for concrete
| Sample numbering | Sample source | Ratio value (%) | Calculated value (%) | Actual value (%) | Difference value |
| Sand sample for concrete 13 | In the same area | 5.05 | 4.3 | 4.5 | 0.2 |
| Sand sample for concrete 14 | In the same area | 13.51 | 16.3 | 16.1 | -0.2 |
| Sand sample for concrete 15 | In the same area | 7.01 | 6.70 | 7.0 | 0.3 |
| Sand sample for concrete 16 | In the same area | 10.70 | 11.9 | 12.0 | 0.1 |
| Sand sample 17 for concrete | Different regions | 7.77 | 7.7 | 6.6 | -0.9 |
| Sand sample for concrete 18 | Different regions | 6.12 | 5.6 | 4.3 | -1.3 |
| Sand sample for concrete 19 | Different regions | 8.89 | 9.2 | 7.5 | -1.7 |
It can be known from the above table that, the difference between the calculated value obtained by conversion of the sand sample for concrete in the same area and the actual value obtained by the conventional cleaning method is within ± 0.5, and the relationship between the proportional value and the actual value is not applicable for the sand sample for concrete in different areas, which is related to the mud powder in the fine aggregate, the mud powder in different areas has different settling velocities of the powder material layers and different expansion degrees of the powder material layers, and the difference between the proportional values of the fine aggregate in different areas is larger for the same actual powder content, so that different relationship curves should be determined for the fine aggregate in different areas.
Therefore, the method is suitable for detecting the content of the sand-mud powder for concrete in the same area, and has the advantages of high detection accuracy and convenience and high efficiency.
Claims (4)
1. The method for rapidly detecting the powder content of the sand for concrete comprises the following steps:
s1, taking a sand sample for concrete, dividing the sand sample into two parts, wherein one part adopts the method in GB/T14684 to detect the powder content, and recording the result as an actual value;
s2, adding the other part into a sealing pipe, enabling the sand sample for concrete to reach a dense filling state by shocking the sealing pipe, enabling the sand sample for concrete to be filled to be H cm in height, and adding water to enable the water surface to reach H cm in height; wherein H is 10-20, and H-H is 3-5; then, the sealing pipe is shaken after sealing, water and concrete are fully contacted and uniformly mixed by using a sand sample, then the sealing pipe is vertically placed on a horizontal plane, after a clear aggregate layer and a powder layer are formed in the sealing pipe by standing, the height of the aggregate layer and the height of the powder layer in the sealing pipe are measured, the ratio of the height of the powder layer to the height of the aggregate layer is calculated, and the result is recorded as a 'proportional value';
s3, repeating the step S1 and the step S2 for N times by taking different sand samples for concrete from the same area to obtain N groups of actual values and proportional values, wherein N is more than or equal to 10;
s4, determining the relation between the two values according to the N groups of 'actual values' and 'proportional values' obtained by the method, listing a relational expression, and substituting the 'proportional values' according to the relational expression to calculate the powder content of different concrete sand samples from the same area.
2. The method for rapidly detecting the powder content of the sand for concrete according to claim 1, characterized in that: the sealing tube is a cylindrical tube made of transparent materials, the inner diameter of the tube is 1.5-3 cm, and the length-diameter ratio is 6-10: 1.
3. The method for rapidly detecting the powder content of the sand for concrete according to claim 2, characterized in that: and a graduated scale is arranged on the pipe wall of the sealing pipe.
4. The method for rapidly detecting the powder content of the sand for concrete according to claim 1, characterized in that: the standing time in step S2 is at least 20 min.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116754754A (en) * | 2023-08-08 | 2023-09-15 | 河北路诚检测技术有限公司 | Detection equipment for detecting raw materials of highway bridge |
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