CN112730156A - Method for comprehensively measuring dry water absorption of artificial sand saturated surface - Google Patents
Method for comprehensively measuring dry water absorption of artificial sand saturated surface Download PDFInfo
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- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
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Abstract
The method for comprehensively measuring the dry water absorption of the saturated surface of the artificial sand is characterized by comprising the following measuring steps: 1. taking a certain amount of artificial sand sample, sieving the artificial sand sample into an upper sieve part and a lower sieve part by using a 0.08mm sieve, and recording the fraction of the upper sieve part and the lower sieve part in the total sample; 2. the oversize part is measured by a natural sand saturated surface dry water absorption test method; 3. preparing a plurality of stone powder samples with different water contents by the sieved part according to the estimated dry water absorption of the saturated surface, sequentially differing the water contents at equal intervals, and measuring the dry water absorption of the saturated surface; 4. and multiplying the saturated surface dry water absorption of the oversize part by the fraction of the oversize part, and adding the saturated surface dry water absorption of the stone powder by the fraction of the undersize part to obtain the saturated surface dry water absorption of the artificial sand sample. The invention sieves the artificial sand into the two parts of the upper sieve and the lower sieve by using the 0.08mm sieve, has accurate measurement result and strong practicability, can be applied to the field with weaker test conditions, and can give a result by outputting data on the field.
Description
Technical Field
The invention belongs to the detection of artificial sand, and particularly relates to the determination of water absorption of artificial sand.
Background
The dry water absorption of the sand saturation surface is an important parameter for the design of the mix proportion of hydraulic concrete and the adjustment of the actual water consumption of a field mixing plant. At present, the method for detecting the dry water absorption of the saturated surface of the artificial sand at home and abroad mainly comprises the following steps: the wet mark method and the test mold method are two methods, but the production practice shows that the detection results of the same artificial sand sample and the same detector are greatly different by adopting the two detection methods; such as: in each large-scale hydropower project in China using artificial sand, wherein authors participate in construction and examination, samples are sent to different test units for comparison and detection, and the detection results have larger differences, such as: when the content of limestone powder (<0.08mm) in limestone artificial sand of Guizhou Guanling power station is 9%, the detection result of a wet mark method is 1.73%, the detection result of a test pattern method is 2.89% (see table 1), and the limestone artificial sand cannot provide a relatively accurate test result because the two cannot be mutually corresponding; some artificial sand in construction sites is stable in production, raw materials are not changed, production equipment and production processes are not changed, the content of particles (called stone powder) smaller than 0.08mm is stable near 5%, the measured dry water absorption of the saturated surface of the artificial sand is changed within the range of 0.7% -2.5%, and accurate parameters are difficult to provide for adjusting the actual water consumption of the mixing building in the field.
Table 1 shows the results of the artificial sand test using the test pattern method and the wet mark method for the detection of the dry water absorption of the saturated surface
Disclosure of Invention
The invention aims to overcome the defect of inaccurate detection in the conventional artificial sand saturated surface dry water absorption detection, and provides a method for comprehensively measuring the artificial sand saturated surface dry water absorption, which has accurate detection and can provide accurate parameters for adjusting the actual water consumption of a field mixing plant.
The technical scheme adopted by the invention is a method for comprehensively measuring the dry water absorption of the saturated surface of the artificial sand, and the key points are that the measuring steps are as follows:
1.1. taking a certain amount of artificial sand sample, sieving the artificial sand sample into an upper sieve part and a lower sieve part by using a 0.08mm sieve, and recording the fraction of the upper sieve part and the lower sieve part in the total sample, wherein the lower sieve part is also called as stone powder;
1.2. measuring the saturated surface dry water absorption of the oversize part by using a natural sand saturated surface dry water absorption test method;
1.3. preparing a plurality of stone powder samples with different water contents by the sieved part according to the estimated dry water absorption of the saturated surface, sequentially differing the water contents at equal intervals, and measuring the dry water absorption of the saturated surface;
1.4. and multiplying the saturated surface dry water absorption of the oversize part by the fraction of the oversize part, and adding the saturated surface dry water absorption of the stone powder by the fraction of the undersize part to obtain the saturated surface dry water absorption of the artificial sand sample.
The invention creatively sieves the artificial sand into an oversize part and an undersize part by using a 0.08mm sieve, obtains the saturated surface dry water absorption of the two parts by adopting different measurement methods for the two parts, and obtains an accurate artificial sand saturated surface dry water absorption detection result by weighting calculation according to the proportion of the sieving results of the two parts.
The comprehensive artificial sand saturated surface dry water absorption test method overcomes the defects of the original method, improves the artificial sand saturated surface dry water absorption detection method, provides more accurate parameters for concrete mix proportion design and actual water consumption adjustment of a field mixing plant, provides guarantee for test detection technology, and provides basis for design and standard compiling. Considering that a test model method adopted in a natural sand saturated surface dry water absorption test is used for many years and the result is satisfactory; the artificial sand is mainly different from natural sand in that the content of stone powder in the artificial sand is large, so that the main reason why the saturated surface dry water absorption of the artificial sand cannot obtain a satisfactory result is caused by large measurement error of the saturated surface dry water absorption of the stone powder part in the artificial sand. If the particles with the size larger than 0.08mm are tested according to the saturated surface dry water absorption of the natural sand, and the saturated surface dry water absorption of the particles with the size smaller than 0.08mm is tested by referring to the geotechnical test method, the accurate results of the particles and the soil can be obtained; and then, the accurate detection result of the dry water absorption of the saturated surface of the artificial sand can be obtained by weighting and calculating according to the screening result proportion of the two.
Further design: the quantity of stone powder samples in the step 1.3 is 5-7, and the difference between the water contents is 2 +/-0.5%. The smaller the difference of the water content of the stone powder sub-samples is, the more accurate the obtained result is, but the more the sub-samples are, the more the workload is increased.
The method for determining the actual dry water absorption of the saturated surface of the stone powder subsample in the step 1.3 is characterized in that the coning depth and the water content of the stone powder are simultaneously determined by adopting a geotechnical liquid plastic limit joint determinator for a plurality of subsamples, a relation curve of the coning depth and the water content of the stone powder is drawn, and the water content of the stone powder at the minimum point of the coning depth is found, namely the dry water absorption of the saturated surface of the stone powder.
According to the invention, through statistical experience, in a weak test field, the number of sub-samples cannot be too large, after test data is marked out, a relation curve of falling cone depth and stone powder water content is drawn, the stone powder water content at the minimum point of the falling cone depth is found out, namely the stone powder saturated surface dry water absorption rate, and the accuracy rate of error within one thousandth reaches more than 98%.
The method for determining the actual dry water absorption of the saturated surface of the stone powder subsample in the step 1.3 is characterized in that a geotechnical liquid plastic limit joint determinator is adopted to simultaneously determine the depth of cone falling and the water content of stone powder for a plurality of subsamples, and the water content of the stone powder when the depth of cone falling is the minimum is taken, namely the dry water absorption of the saturated surface of the stone powder. The method is suitable for being applied to sites with harsh test conditions or lower requirements on the concrete mixing ratio and under the conditions of drawing without conditions and the like, and is high in speed.
Taking a certain amount of artificial sand sample in the step 1.1, wherein the weight of the artificial sand sample is more than 20 kg. The subsamples can be reused when there are fewer samples.
In order to ensure the accuracy of sample detection, the better design is as follows: taking a certain amount of artificial sand sample in the step 1.1, and sieving the artificial sand sample by a 0.08mm sieve, wherein the undersize part of the artificial sand sample is more than 1000 g. The subsamples can be reused when there are fewer samples.
The stone powder sample in the step 1.3 has the weight of 100 g-200 g.
The pre-estimated value of the saturation surface dry water absorption of the under-sieve part can be the average value of the previous detection results or the previous detection results, and the saturation surface dry water absorption of the under-sieve part estimated according to the first detection is 10%.
The artificial sand sample in the step 1.3 (except that the water content is measured for the first time from 4 to 16 percent, and a stone powder sub-sample is manufactured every 2 +/-0.5 percent), the water content data of stone powder in the last time or a last period of time can be referred to when the water absorption of the saturated face of the artificial sand is measured to be used as a predicted value, the water content of the sub-sample is measured according to the predicted value and the water contents of +/-1%, +/-2%, +/-3% of the predicted value, the cone falling depth and the water content of the stone powder are simultaneously measured by adopting a soil solution plastic limit joint tester, and the water absorption of the stone powder when the cone falling depth is the minimum is taken to.
The method for preparing the stone powder sample with the water content of 4-16% at intervals of 2 +/-0.5% in the step 1.3 comprises the following steps: adopting dried stone powder samples, wherein 7 parts of the dried stone powder samples are 100 g-200 g, respectively adding distilled water accounting for 4%, 6%,8%, 10%, 12%, 14% and 16% of the weight of the stone powder samples according to the weight of the stone powder samples, storing in a sealed manner, standing for 24 hours, and respectively adopting a geotechnical liquid plastic limit joint determinator to simultaneously determine the depth of falling cone and the water content of the stone powder to the sub-samples: fully and uniformly stirring the prepared stone powder sample by using a soil adjusting knife, densely filling the stone powder sample into a sample cup of a liquid-plastic limit joint tester, enabling air to escape, scraping the residual soil higher than the sample cup by using the soil scraping knife, immediately placing the sample cup on an instrument base, taking a cone instrument, coating thin-layer lubricating grease on the cone, switching on a power supply, enabling an electromagnet to absorb the cone instrument stably, adjusting a screen alignment to enable an initial reading to be zero, adjusting a lifting seat to enable a cone angle of the cone instrument to be in contact with a sample surface, sinking the cone into the sample under the self-weight when an indicator lamp is on, immediately measuring the sinking depth of the cone after 5 seconds, then taking out the sample cup, taking 2 samples above 10g, measuring the actual water content, and taking the stone powder water content when the sinking depth is the minimum, namely the dry water absorption rate of the saturated face of the stone powder.
Under the condition of continuous detection, the dry water absorption of the limestone powder saturated surface in the last time is used as an estimated value, and 5-7 subsamples are selected by using the estimated value as an intermediate value, and the water content difference between the subsamples is 0.8-1.2%, and the test is carried out according to the steps 1.3 and 1.4 to obtain the dry water absorption of the limestone powder saturated surface. In the actual production process, due to continuous production, when the dry water absorption of the saturated surface of the artificial sand is measured (except for first measurement), the water content data of the stone powder at the last time or a period of time can be referred to as an estimated value, and the water content with a smaller interval and a difference of 1% between subsamples is used for testing, so that a more accurate result is obtained.
The comprehensive artificial sand saturated surface dry water absorption test method overcomes the defects of the original method, improves the artificial sand saturated surface dry water absorption detection method, provides more accurate parameters for concrete mix proportion design and actual water consumption adjustment of a field mixing plant, provides guarantee for test detection technology, and provides basis for design and standard compiling. The practicability is strong, and the method can be applied to the field with weak test conditions, and can output data and give results on the field.
Drawings
FIG. 1 is a graph showing the relationship between the depth of falling cone and the water content of stone powder in example 1
FIG. 2 is a graph showing the relationship between depth of falling cone and water content of stone powder in the retest of example 1
FIG. 3 is a graph showing the relationship between the falling depth and the water content of stone powder in example 2
FIG. 4 is a graph showing the relationship between the falling depth and the water content of stone powder in example 3
Detailed Description
The present invention is described in detail below with reference to the drawings, which illustrate examples that enable those skilled in the art to understand the present invention, but do not limit the present invention in any way.
The invention was tested in three examples in Table 1
1. the tuff artificial sand of the Yongtai pumped storage power station has the fineness modulus of 2.79; taking 20kg of dried artificial sand sample, sieving the artificial sand sample into an upper sieve part and a lower sieve part by using a 0.08mm sieve, and recording the fraction of the upper sieve part and the lower sieve part in the total sample: the content of particles larger than or equal to 0.08mm in the sample is 88.3 percent; the content of particles smaller than 0.08mm is 11.7 percent;
1.2. wherein the saturated surface dry water absorption of the particles on the 0.08mm sieve is detected by a 2.2 sand apparent density and water absorption test in SL352-2006 Hydraulic concrete test Specification to obtain the saturated surface dry water absorption of 0.83 percent;
1.3. the weight of the screen part was 2340g (the sub-sample could be reused when there were fewer samples). For the first detection, the estimated saturated dry water absorption is 10%, and 7 samples of 200g each are added with distilled water according to 4%, 6%,8%, 10%, 12%, 14% and 16%, namely 8g, 12g, 16g, 20g, 24g, 28g and 32g of distilled water. Sealing and storing, and standing for 24 hours.
Respectively and fully and uniformly stirring the prepared stone powder samples by using a soil adjusting knife, and compactly filling the stone powder samples into a sample cup of a liquid-plastic limit joint tester to ensure that air escapes. The residual soil higher than the sample cup is scraped by a scraper, and the sample cup is immediately placed on the instrument base. Taking the cone instrument, coating a thin layer of lubricating grease on the cone, and switching on a power supply to ensure that the electromagnet absorbs and stabilizes the cone instrument. Adjust the screen alignment, make the initial reading zero, adjust the lift seat, make circular cone appearance cone angle contact sample face, the circular cone sinks in the sample under the dead weight when the pilot lamp is bright, measure the cone depth of sinking immediately after 5 seconds, then take out the sample cup, 2 above 10g samples are taken, survey actual moisture content, because distilled water has other objective reasons such as certain evaporation, stirring homogeneity in spraying the sample, the percentage of the actual moisture content of event survey and the theoretically joining distilled water has certain error.
The results are shown in table 2 and fig. 1.
Table 2 shows the relationship between the falling depth of the artificial sand stone powder of tuff in the power storage station and the water content of the stone powder
| Actual moisture content of stone powder (%) | 4.1 | 6.1 | 8.2 | 10.2 | 12.3 | 14.0 | 15.8 |
| Depth of penetration of falling cone (mm) | 3.1 | 2.3 | 2.2 | 2.0 | 2.0 | 2.3 | 3.2 |
The points in table 2 are plotted in coordinates, and since the bottom of the curve of the relationship between the depth of falling cone and the water content of the stone powder is an approximate parabolic graph, fig. 1 is obtained.
From table 2 or fig. 1, it can be seen that the minimum value of the falling cone penetration depth is about 11.4% relative to the water content of the stone powder. For higher accuracy, with 11.4% as the median, 5 sub-samples were taken, 200g each, and stone powder samples were made every 1%, with distilled water added at 9.4%, 10.4%, 11.4%, 12.4%, 13.4%, i.e., 18.8g, 20.8g, 22.8g, 24.8g, 26.8g, respectively. Sealing and storing, and standing for 24 hours. Detecting according to the step 1.3, and measuring the actual water content of the subsample;
the results are shown in table 3 and fig. 2:
table 3 shows the relationship between the falling depth of the artificial sand stone powder of tuff in the power storage station and the water content of the stone powder
| Water content of stone powder (%) | 9.0 | 10.2 | 11.4 | 12.2 | 13.2 |
| Depth of penetration of falling cone (mm) | 2.1 | 2.0 | 1.9 | 2.0 | 2.2 |
Similarly, when the falling depth is 1.9mm, the water content of the stone powder is 11.4%, as shown in FIG. 2.
1.4. The dry water absorption of the saturated surface of the artificial sand is equal to the dry water absorption of the saturated surface of the upper part of the sieve multiplied by the fraction of the upper part of the sieve plus the dry water absorption of the saturated surface of the lower part of the sieve multiplied by the fraction of the lower part of the sieve
Saturated dry face water absorption of artificial sand (0.83% × 88.3% + 11.4% × 11.7%) × 100% × 2.07%
The other simple method for measuring the dry water absorption of the saturated surface of the stone powder subsample is to simultaneously measure the depth of cone falling and the water content of the stone powder by adopting a geotechnical liquid plastic limit combined measuring instrument for a plurality of subsamples, and the water content of the stone powder when the depth of cone falling is the minimum is taken, namely the dry water absorption of the saturated surface of the stone powder. The method is suitable for being applied to sites with harsh test conditions or lower requirements on the concrete mixing ratio and under the conditions of drawing without conditions and the like, and is high in speed. When this method was used in example 1, it was found from Table 2 that the minimum falling cone depth was 2.0, the water contents thereof were 10.2 and 12.3, respectively, and the saturated surface dry water absorption of the stone powder was about 11.25%.
The dry water absorption of the saturated surface of the artificial sand is equal to the dry water absorption of the saturated surface of the upper part of the sieve multiplied by the fraction of the upper part of the sieve plus the dry water absorption of the saturated surface of the lower part of the sieve multiplied by the fraction of the lower part of the sieve
Saturated dry face water absorption of artificial sand (0.83% × 88.3% + 11.25% × 11.7%) × 100% × 2.05%
The error of accurate detection of drawing is 0.02%, and the error value is within one thousandth.
Because the content of the stone powder in the artificial sand is not more than 10 percent, the saturated surface dry water absorption of the stone powder can be accurately 1 percent, the error converted into the saturated surface dry water absorption of the whole artificial sand is about 0.1 percent, and the actual use requirement can be met.
Example 2. 11 th test of continuous engineering, limestone artificial sand of Guizhou Guanling power station, fineness modulus 2.97; taking 10kg of dried artificial sand sample, sieving the artificial sand sample into an upper sieve part and a lower sieve part by using a 0.08mm sieve, and recording the fraction of the upper sieve part and the lower sieve part in the total sample: the content of particles larger than or equal to 0.08mm in the sample is 88.6 percent; the content of particles smaller than 0.08mm is 11.4 percent;
2.2. wherein, the saturated surface dry water absorption of the particles on the sieve with 0.08mm is 1.05 percent;
2.3. the weight of the sieved part is 1140g, and due to the continuity of the engineering, except for the first detection according to the step 1.3 of the above example, the average value of the saturated surface dry water content which can be detected once or several times is used as a prediction value of the detection, and the average value of the saturated surface dry water content of the stone powder is 13.5 percent in the previous 10 times. For higher accuracy, 13.5% is used as the intermediate value, each 200g, 5 are used, and one stone powder sample is prepared every 1%, and distilled water is added according to the proportion of 11.5%, 12.5%, 13.5%, 14.5% and 15.5%, namely 23g, 25g, 27g, 29g and 31g of distilled water are respectively added. Sealing and storing, and standing for 24 hours. Detecting according to the step 1.3, and measuring the actual water content of the subsample;
the results are shown in table 4 and fig. 3:
TABLE 4 relationship between falling depth of limestone powder and water content of limestone powder
| Water content of stone powder (%) | 11.4 | 12.4 | 13.5 | 14.6 | 15.5 |
| Depth of penetration of falling cone (mm) | 2.3 | 2.2 | 2.2 | 2.4 | 2.6 |
When the falling depth was 2.18mm, the water content of the stone powder was 13.0%, as shown in FIG. 3.
2.4. The dry water absorption of the saturated surface of the artificial sand is equal to the dry water absorption of the saturated surface of the upper part of the sieve multiplied by the fraction of the upper part of the sieve plus the dry water absorption of the saturated surface of the lower part of the sieve multiplied by the fraction of the lower part of the sieve
The saturated dry face water absorption of the artificial sand was (1.05% × 88.6% + 13.0% × 11.4%) and × 100% × 2.41%.
The rest of the composition is the same as the above example.
Example 3. artificial sand of granite of Zhongning pumped storage power station, fineness modulus 2.70; taking 20kg of dried artificial sand sample, sieving the artificial sand sample into an upper sieve part and a lower sieve part by using a 0.08mm sieve, and recording the fraction of the upper sieve part and the lower sieve part in the total sample: the content of particles larger than or equal to 0.08mm in the sample is 91.7 percent; the content of particles smaller than 0.08mm is 8.3 percent;
3.2. wherein, the saturated surface dry water absorption of the particles on the sieve with 0.08mm is 0.88 percent;
3.3. the weight of the sieved part is 1660g, and the moisture content of the saturated dried flour detected by the stone powder at the previous time is 9.0%. For higher accuracy, a stone powder sample is prepared every 1% by taking 9.0% as an intermediate value, 150g and 5 in total, and distilled water is added according to the proportion of 7%, 8%, 9%, 10% and 11%, namely 10.5g, 12g, 13.5g, 15g and 16.5g are respectively added. Sealing and storing, and standing for 24 hours. Detecting according to the step 1.3, and measuring the actual water content of the subsample;
the results are shown in table 5 and fig. 4:
when the falling depth was set to 1.97mm, the water content of the stone powder was 9.5%, as shown in FIG. 4.
3.4. The dry water absorption of the saturated surface of the artificial sand is equal to the dry water absorption of the saturated surface of the upper part of the sieve multiplied by the fraction of the upper part of the sieve plus the dry water absorption of the saturated surface of the lower part of the sieve multiplied by the fraction of the lower part of the sieve
The saturated dry face water absorption of the artificial sand was (0.88% × 91.7% + 9.5% × 8.3%) and × 100% × 1.60%.
Description of the drawings: the surface of the dried stone powder particles adsorbs air, and the acting force between the particles is very small. When the water content of the stone powder is gradually increased, part of water is leaked to the surfaces of the particles to play a role in binding, and the acting force between the particles is increased. The acting force among the particles is maximum when the water content of the stone powder reaches the saturated surface dry water absorption rate. And the water content of the stone powder is continuously increased, and redundant water forms water films among the particles, so that the lubricating effect is achieved, and the acting force among the particles is reduced.
Therefore, the stone powder with different water contents is prepared, and the penetration depth is respectively measured by using a liquid-plastic limit joint tester of the geotechnical test, wherein the penetration depth is the smallest (the acting force among particles is the largest), and the water content is the saturated surface dry water absorption of the stone powder.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications and equivalents made on the basis of the technical idea of the present invention fall within the protection scope of the present invention.
Claims (10)
1. A method for comprehensively measuring the dry water absorption of a saturated surface of artificial sand is characterized by comprising the following steps: the determination steps are as follows:
1.1. taking a certain amount of artificial sand sample, sieving the artificial sand sample into an upper sieve part and a lower sieve part by using a 0.08mm sieve, and recording the fraction of the upper sieve part and the lower sieve part in the total sample, wherein the lower sieve part is also called as stone powder;
1.2. the dry water absorption test method of the saturated surface of the natural sand is used for measuring the actual dry water absorption of the saturated surface of the oversize part;
1.3. preparing a plurality of stone powder samples with different water contents by the sieved part according to the estimated dry water absorption of the saturated surface, sequentially differing the water contents at equal intervals, and measuring the dry water absorption of the saturated surface;
1.4. and multiplying the saturated surface dry water absorption of the oversize part by the fraction of the oversize part, and adding the saturated surface dry water absorption of the stone powder by the fraction of the undersize part to obtain the saturated surface dry water absorption of the artificial sand sample.
2. The method for comprehensively measuring the dry water absorption of the saturated surface of the artificial sand as claimed in claim 1, which is characterized in that: the quantity of stone powder samples in the step 1.3 is 5-7, and the difference between the water contents is 2 +/-0.5%.
3. The method for comprehensively measuring the dry water absorption of the saturated surface of the artificial sand as claimed in claim 1, which is characterized in that: the method for determining the dry water absorption of the saturated surface of the stone powder subsample in the step 1.3 is characterized in that a geotechnical liquid plastic limit joint determinator is adopted by a plurality of subsamples to simultaneously determine the depth of falling cone and the water content of stone powder, a relation curve of the depth of falling cone and the water content of the stone powder is drawn, and the water content of the stone powder at the minimum point of the depth of falling cone is found, namely the dry water absorption of the saturated surface of the stone powder.
4. The method for comprehensively measuring the dry water absorption of the saturated surface of the artificial sand as claimed in claim 1, which is characterized in that: the method for determining the dry water absorption of the saturated surface of the stone powder subsample in the step 1.3 is characterized in that a geotechnical liquid plastic limit joint determinator is adopted to simultaneously determine the depth of cone falling and the water content of stone powder for a plurality of subsamples, and the water content of the stone powder when the depth of cone falling is the minimum is taken, namely the dry water absorption of the saturated surface of the stone powder.
5. The method for comprehensively measuring the dry water absorption of the saturated surface of the artificial sand as claimed in claim 1, which is characterized in that: taking a certain amount of artificial sand sample in the step 1.1, wherein the weight of the artificial sand sample is more than 20 kg.
6. The method for comprehensively measuring the dry water absorption of the saturated surface of the artificial sand as claimed in claim 1, which is characterized in that: taking a certain amount of artificial sand sample in the step 1.1, and sieving the artificial sand sample by a 0.08mm sieve, wherein the undersize part of the artificial sand sample is more than 1000 g.
7. The method for comprehensively measuring the dry water absorption of the saturated surface of the artificial sand as claimed in claim 1, which is characterized in that: the stone powder sample in the step 1.3 has the weight of 100 g-200 g.
8. The method for comprehensively measuring the dry water absorption of the saturated surface of the artificial sand as claimed in claim 1, which is characterized in that: the dry water absorption of the undersize fraction at the estimated saturated surface is 10%.
9. The method for comprehensively measuring the dry water absorption of the saturated surface of the artificial sand as claimed in claim 1, which is characterized in that: the method for preparing the stone powder sample with the water content of 4-16% at intervals of 2 +/-0.5% in the step 1.3 comprises the following steps: adopting dried stone powder samples, wherein 7 parts by weight of the stone powder samples are 100 g-200 g, respectively adding 4%, 6%,8%, 10%, 12%, 14% and 16% of distilled water according to the calculation, storing in a sealed way, standing for 24 hours, and simultaneously measuring the depth of falling cone and the water content of the stone powder on the sub-samples by adopting a geotechnical liquid plastic limit joint determinator: fully and uniformly stirring the prepared stone powder sample by using a soil adjusting knife, densely filling the stone powder sample into a sample cup of a liquid-plastic limit joint tester, enabling air to escape, scraping the residual soil higher than the sample cup by using the soil scraping knife, immediately placing the sample cup on an instrument base, taking a cone instrument, coating thin-layer lubricating grease on the cone, switching on a power supply, enabling an electromagnet to absorb the cone instrument stably, adjusting a screen alignment to enable an initial reading to be zero, adjusting a lifting seat to enable a cone angle of the cone instrument to be in contact with a sample surface, sinking the cone into the sample under the self-weight when an indicator lamp is on, immediately measuring the sinking depth of the cone after 5 seconds, then taking out the sample cup, taking 2 samples above 10g, measuring the actual water content, and taking the stone powder water content when the sinking depth is the minimum, namely the dry water absorption rate of the saturated face of the stone powder.
10. The method for comprehensively measuring the dry water absorption of the saturated surface of the artificial sand as claimed in claim 1, which is characterized in that: under the condition of continuous detection, the dry water absorption of the limestone powder saturated surface in the last time is used as an estimated value, and 5-7 subsamples are selected by using the estimated value as an intermediate value, and the water content difference between the subsamples is 0.8-1.2%, and the test is carried out according to the steps 1.3 and 1.4 to obtain the dry water absorption of the limestone powder saturated surface.
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