CN114509367B - 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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- CN114509367B CN114509367B CN202111681853.2A CN202111681853A CN114509367B CN 114509367 B CN114509367 B CN 114509367B CN 202111681853 A CN202111681853 A CN 202111681853A CN 114509367 B CN114509367 B CN 114509367B
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- 239000004576 sand Substances 0.000 title claims abstract description 114
- 239000004567 concrete Substances 0.000 title claims abstract description 105
- 239000000843 powder Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000011049 filling Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 10
- 230000035939 shock Effects 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 4
- 239000004927 clay Substances 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 239000000428 dust Substances 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
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 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
- 238000011068 loading method Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 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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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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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, wherein the sand sample is divided into two parts, and one part adopts a method in GB/T14684 to detect the powder content; s2, adding the other part into a sealing tube, achieving a compact filling state through the shock sealing tube, and then adding water; then shaking the sealing tube after sealing, and after the clear bone material layer and the clear powder layer are formed in the sealing tube, measuring the height of the bone material layer and the height of the powder layer in the sealing tube; s3, repeating the steps S1 and S2 for measuring the sand samples from different concretes in the same area for N times; s4, determining the relation between the two values according to the N groups of actual values and the proportion values obtained by the method, and setting out a relation formula, and carrying out calculation by taking the proportion values into the relation formula to obtain the powder content of different concrete sand samples from the same area. The advantages are that: the method can realize the rapid detection of the mud powder content in the sand for concrete, 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
The concrete is one of important raw materials of modern buildings, aggregate in the raw materials of the concrete occupies a great part of specific gravity, and especially, various parameter indexes of a sand sample for the concrete have great influence on the performance of the concrete, and particularly, the mud powder content in the sand sample for the concrete has remarkable influence on the admixture mixing amount, fluidity and the like of the concrete.
At present, the mud powder content of the sand for concrete is mainly detected by a detection scheme in GB/T14684, but the method is complicated to detect, and is inconvenient for rapidly measuring the powder content of the sand for concrete in the occasion of large sample quantity and large detection requirement. Therefore, the parameters of the powder content in the aggregate can be obtained quickly, and the method has positive effects on adjusting the concrete guiding production mixing ratio.
Disclosure of Invention
The invention provides a method for rapidly detecting the powder content of sand for concrete, which aims to rapidly detect the powder content of the sand for concrete.
The technical scheme adopted by the invention is as follows: the method for rapidly detecting the powder content of the sand for the concrete comprises the following steps:
s1, taking a sand sample for concrete, dividing the sand sample into two parts, detecting the powder content of one part by adopting a method in GB/T14684, and recording the result as an actual value;
s2, adding the other part of the sand sample into a sealing tube, enabling the sand sample for concrete to reach a compact filling state through shocking the sealing tube, filling the sand sample for concrete into the sealing tube to a height of H cm, and adding water to enable the water surface height to reach H cm; wherein, h=10 to 20, h-h=3 to 5; then shaking the sealing tube after sealing to fully contact and mix water and sand samples for concrete, then standing the sealing tube on a horizontal plane, standing until a clear bone material layer and a clear powder layer are formed in the sealing tube, measuring the height of the bone material layer and the height of the powder layer in the sealing tube, calculating the ratio of the height of the powder layer to the height of the bone material layer, and recording the result as a 'ratio value';
s3, repeating the steps S1 and S2 for measuring the sand samples from different concrete in the same area for N times 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 the proportion values obtained by the method, and setting out a relational expression, and carrying the proportion 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) The sample is put into an oven with the temperature of (105+/-5) ℃ to be dried to constant weight, and after being cooled to room temperature, 400g of the sample is weighedm 0 ) Is ready for use;
(2) Placing the dried sample in a container, injecting drinking water to make the water surface be 150mm higher than the sand surface, fully and uniformly stirring, soaking for 2h, then washing the sample in water to make dust, sludge and clay separated from sand grains, and making them be suspended or dissolved in water. Slowly pouring the turbid liquid into a square-hole sleeve sieve (1.25 mm sieve is placed on the upper surface) with nominal diameter of 1.25mm and 80 mu m, filtering out particles smaller than 80 mu m, wetting two sides of the sieve with water before test, and avoiding sand loss in the whole test process;
(3) Adding water into the container again, and repeating the process until the water washed out of the barrel is clear;
(4) The fines remaining on the screen were rinsed with water and an 80 μm screen was placed in water (with the water surface slightly above the upper surface of the sand in the screen) and shaken back and forth to thoroughly wash out the particles smaller than 80 μm, and dried to constant weight in an oven at a temperature of (105.+ -. 5). The sample was cooled to room temperature, and the mass (m 1 )；
(5) The powder content was calculated according to the following formula:
W＝(m 1 -m 0 )/m 0 ×100％。
those skilled in the art will readily appreciate that the "origin in the same region" as used herein refers to the same place of production of the sand sample for concrete.
As a further improvement of the invention, the sealing tube is a transparent cylindrical tube, 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 tube have key effects on the separation effect of sand powder, the fine tube with the large length-diameter ratio is selected, the full contact of water and sand samples for concrete is not facilitated, the coarse tube with the 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 concrete are also required to be filled; therefore, it is desirable to select a seal tube of the size and aspect ratio of the present embodiment. More preferably, the tube wall of the sealing tube is provided with a graduated scale so as to facilitate rapid measurement.
As a further improvement of the invention, the rest time in step S2 is at least 20min.
The beneficial effects of the invention are as follows: the method can realize the rapid detection of the mud powder content in the sand for concrete, and the detection result is accurate.
Detailed Description
The invention is further illustrated below with reference to examples.
Examples:
the mud powder content of 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 concrete method comprises the following steps:
(1) The sample was dried in an oven at a temperature of (105.+ -. 5) ℃ to a constant weight, cooled to room temperature, and 400g (m) 0 ) Is ready for use;
(2) Placing the dried sample in a container, injecting drinking water to make the water surface be 150mm higher than the sand surface, fully and uniformly stirring, soaking for 2h, then washing the sample in water to make dust, sludge and clay separated from sand grains, and making them be suspended or dissolved in water. Slowly pouring the turbid liquid into a square-hole sleeve sieve (1.25 mm sieve is placed on the upper surface) with nominal diameter of 1.25mm and 80 mu m, filtering out particles smaller than 80 mu m, wetting two sides of the sieve with water before test, and avoiding sand loss in the whole test process;
(3) Adding water into the container again, and repeating the process until the water washed out of the barrel is clear;
(4) The fines remaining on the screen were rinsed with water and an 80 μm screen was placed in water (with the water surface slightly above the upper surface of the sand in the screen) and shaken back and forth to thoroughly wash out the particles smaller than 80 μm, and dried to constant weight in an oven at a temperature of (105.+ -. 5). The sample was cooled to room temperature, and the mass (m 1 )；
(5) The powder content was calculated according to the following formula:
W＝(m 1 -m 0 )/m 0 the powder content is shown in Table 1.
B. Adding the other part into a sealing tube, vibrating the sealing tube to enable the sand sample for concrete to reach a compact filling state, filling the sand sample for concrete into the sealing tube to a height of 15cm, and adding water to enable the water surface height to reach 18cm; then shaking the sealing tube after sealing to fully contact and mix water and sand samples for concrete, standing the sealing tube on a horizontal plane, standing for 30min until clear bone material layers and powder layers are formed in the sealing tube, measuring the height of the aggregate layers and the height of the powder layers in the sealing tube, calculating the ratio of the height of the powder layers to the height of the aggregate layers, and recording the result as a 'ratio value'; the results are shown in Table 1. The sealing tube is a transparent cylindrical tube, the tube wall is provided with a graduated scale, the inner diameter of the tube is 2.6cm, and the length-diameter ratio is 8:1.
C. Respectively taking a sand sample 2 for concrete, a sand sample 3 for concrete, a sand sample 4 for concrete, a sand sample 5 for concrete, a sand sample 6 for concrete, a sand sample 7 for concrete, a sand sample 8 for concrete which originate from the same area as the sand sample A for concrete, the above-mentioned step a, step B and the corresponding "actual value" and "proportional value" were obtained by repeating the above-mentioned steps, respectively, of the concrete sand sample 9, the concrete sand sample 10, the concrete sand sample 11 and the concrete sand sample 12, and the results are shown in table 1.
TABLE 1 detection results of "actual value" and "proportional value" of sand sample for concrete
| Sample numbering | Proportional value (%) | Actual value (%) |
| Sand sample 1 for concrete | 1.90 | 0.6 |
| Sand sample 2 for concrete | 2.73 | 1.8 |
| Sand sample 3 for concrete | 3.57 | 2.4 |
| Sand sample 4 for concrete | 4.46 | 3.8 |
| Sand sample 5 for concrete | 5.41 | 5.0 |
| Sand sample 6 for concrete | 6.36 | 5.9 |
| Sand sample 7 for concrete | 7.48 | 6.9 |
| Sand sample 8 for concrete | 8.57 | 7.9 |
| Sand sample 9 for concrete | 9.09 | 10.2 |
| Sand sample 10 for concrete | 10.28 | 11.7 |
| Sand sample 11 for concrete | 11.80 | 13.1 |
| Sand sample 12 for concrete | 12.08 | 14.2 |
D. The relationship between the two values is determined from the above table "actual value" and "proportional value", and the relationship (1) is listed:
y＝269.17x 2 +92.096x-1.0749 (1)
E. the mud powder content of the sand sample 13 for concrete is detected according to the above method, and the concrete steps are as follows:
adding a sample into a sealing tube, enabling the sand sample for concrete to reach a compact filling state by shocking the sealing tube, loading the sand sample for concrete to a height of 15cm, and adding water to enable the water surface height to reach 18cm; then shaking the sealing tube after sealing to fully contact and mix water and sand samples for concrete, standing the sealing tube on a horizontal plane, standing for 30min until clear bone material layers and powder layers are formed in the sealing tube, measuring the height of the aggregate layers and the height of the powder layers in the sealing tube, calculating the ratio of the height of the powder layers to the height of the aggregate layers, and recording the result as a 'ratio value'; the results are shown in Table 1. The sealing tube is a transparent cylindrical tube, the tube wall is provided with a graduated scale, the inner diameter of the tube is 2.6cm, and the length-diameter ratio is 8:1.
The measured "ratio value" was taken as x into formula (1), the calculated y value was the mud powder content of the sand sample 13 for concrete, and the calculated result was recorded as "calculated value", and the result is shown in table 2.
F. Another sample 13 of sand for concrete was taken and the powder content was measured according to the method described in GB/T14684 above, and the results were compared with the "calculated value" to verify the accuracy of the measurement results of the method of the present invention, the results being shown in table 2.
G. And (c) repeating the step (E) and the step (F) for detecting the concrete sand sample 13, the concrete sand sample 14, the concrete sand sample 15, the concrete sand sample 16, the concrete sand sample 17, the concrete sand sample 18 and the 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 are sourced 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 are sourced from different regions. The corresponding "scale value" was obtained, and the difference between the "actual value" and the "calculated value" was calculated, and the result is shown in table 2.
Table 2 comparison table of detection accuracy of sand sample for concrete
| Sample numbering | Sample source | Proportional value (%) | Calculated (%) | Actual value (%) | Difference value |
| Sand sample 13 for concrete | In the same area | 5.05 | 4.3 | 4.5 | 0.2 |
| Sand sample 14 for concrete | In the same area | 13.51 | 16.3 | 16.1 | -0.2 |
| Sand sample 15 for concrete | In the same area | 7.01 | 6.70 | 7.0 | 0.3 |
| Sand sample 16 for concrete | 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 18 for concrete | Different regions | 6.12 | 5.6 | 4.3 | -1.3 |
| Sand sample 19 for concrete | Different regions | 8.89 | 9.2 | 7.5 | -1.7 |
As can be seen from the above table, the difference between the calculated value obtained by conversion and the actual value obtained by the conventional cleaning method of the sand sample for concrete in the same region is within + -0.5, and the relationship between the calculated value and the actual value is not applicable to the sand sample for concrete in different regions, which is related to the mud powder in the fine aggregate, the mud powder in different regions is different, the sedimentation speed of the powder layer is different, the expansion degree of the powder layer is different, and the difference between the calculated value and the actual value of the fine aggregate in different regions is larger for the same actual powder content, so that the relationship curve should be measured for the fine aggregates in different regions.
The method is applicable to the detection of the content of the sand mud powder for the concrete in the same area, and has the advantages of high detection accuracy, convenience and high efficiency.
Claims (4)
1. The method for rapidly detecting the powder content of the sand for the concrete comprises the following steps:
s1, taking a sand sample for concrete, dividing the sand sample into two parts, detecting the powder content of one part by adopting a method in GB/T14684, and recording the result as an actual value;
s2, adding the other part of the sand sample into a sealing tube, enabling the sand sample for concrete to reach a compact filling state through shocking the sealing tube, filling the sand sample for concrete into the sealing tube to a height of H cm, and adding water to enable the water surface height to reach H cm; wherein, h=10 to 20, h-h=3 to 5; then shaking the sealing tube after sealing to fully contact and mix water and sand samples for concrete, then standing the sealing tube on a horizontal plane, standing until a clear bone material layer and a clear powder layer are formed in the sealing tube, measuring the height of the bone material layer and the height of the powder layer in the sealing tube, calculating the ratio of the height of the powder layer to the height of the bone material layer, and recording the result as a 'ratio value';
s3, repeating the steps S1 and S2 for measuring the sand samples from different concrete in the same area for N times 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 the proportion values obtained by the method, and setting out a relational expression, and carrying the proportion 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, wherein the method comprises the following steps: the sealing tube is a transparent cylindrical tube, 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 by comprising the steps of: and the tube wall of the sealing tube is provided with a graduated scale.
4. The method for rapidly detecting the powder content of the sand for concrete according to claim 1, wherein the method comprises the following steps: the rest time in step S2 is at least 20min.
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