CN110736675A - sandstone aggregate saturated surface dry water absorption determination device and method - Google Patents
sandstone aggregate saturated surface dry water absorption determination device and method Download PDFInfo
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- CN110736675A CN110736675A CN201911148274.4A CN201911148274A CN110736675A CN 110736675 A CN110736675 A CN 110736675A CN 201911148274 A CN201911148274 A CN 201911148274A CN 110736675 A CN110736675 A CN 110736675A
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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
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
- G01N5/025—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content for determining moisture content
Abstract
The invention discloses a device and a method for measuring water absorption of saturated surface dry of sandstone aggregates, wherein the device comprises a temperature and humidity control box, an automatic acquisition and recording device, an upper computer, an electronic balance and a sample disc, the top of the temperature and humidity control box is provided with a through hole for communicating the inside and the outside of the temperature and humidity control box, the sample disc is connected with the electronic balance through a pull rope, the pull rope passes through the through hole to hang the sample disc in the temperature and humidity control box, the electronic balance is connected with the automatic acquisition and recording device, and the automatic acquisition and recording device is connected with the upper computer.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a device and a method for measuring the saturation surface dry water absorption of sandstone aggregates.
Background
The dry water absorption of the saturated surface of the sandstone material is an important reference parameter for evaluating the quality characteristics of concrete aggregate and the mix proportion design of concrete, and means that the water content of the sandstone material in the dry state of the saturated surface accounts for the mass of the sandstone material in the dry state or the dry state of the saturated surface. The saturation surface dry state is a state in which the pores of the sandstone material particles, which can be penetrated by water, are filled with water, but the surfaces of the particles have no free water.
The existing method for measuring the dry water absorption of the saturated surface of the sandstone material has the defects of large error, time and labor consumption and rich test experience required by detection personnel, and is difficult to judge and easy to miss because the dry state of the saturated surface of the sandstone material is critical states.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the dry water absorption of a saturated surface of sandstone aggregates, so as to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the device for measuring the saturated surface dry water absorption of kinds of gravel aggregates comprises a temperature and humidity control box, an automatic acquisition and recording device, an upper computer, an electronic scale and a sample disc, wherein a through hole for communicating the inside of the temperature and humidity control box with the outside is formed in the top of the temperature and humidity control box, the sample disc is connected with the electronic scale through a pull rope, the pull rope penetrates through the through hole to hang the sample disc in the temperature and humidity control box, the electronic scale is connected with the automatic acquisition and recording device, and the automatic acquisition and recording device is connected with the upper computer.
Preferably, the bottom of the electronic balance is provided with a hook, and the end of the pull rope far away from the sample plate is connected with the hook.
Preferably, the measuring range of the electronic balance is not less than 5.0kg, and the precision of the electronic balance is not less than 0.01 g.
Preferably, the pull cord is spaced apart from the circumferential wall of the through hole.
The present invention also provides a method for measuring the dry water absorption of a saturated surface of kinds of sand aggregates, which is carried out by using the measuring apparatus described in any of above, comprising the steps of,
s1, taking a proper amount of sand, filling the sand into a pretreatment container, and injecting clear water into the pretreatment container to enable the water surface to be 2cm higher than the sand; soaking the sand in clear water for 24 hours, and keeping the indoor temperature at 20 ℃;
s2, starting a temperature and humidity control box, and controlling the temperature in the temperature and humidity control box to be 10-80 ℃ and the relative humidity to be 10-80%; opening the electronic balance, hanging the sample tray on a hook of the electronic balance by using the pull rope, and resetting the electronic balance;
s3, after sand is soaked for 24 hours, pouring out water in the pretreatment container, weighing quantitative sand as a sand sample, and flatly spreading the sand sample in the sample tray;
s4, starting the automatic acquisition and recording device and the upper computer to start measurement; after the quality of the sand sample does not change any more, adjusting the temperature of a temperature and humidity control box to 105 ℃, drying the sand sample to constant weight, and recording the quality of the sand sample as G0；
S5, calculating and drawing a change curve of the moisture evaporation rate of the sand sample along with time according to the change of the sand sample quality along with time, finding out the inflection point time when the moisture evaporation rate begins to obviously decrease, and recording the sand sample quality G corresponding to the inflection point time1；
S6, calculating the dry water absorption T of the saturated surface of the sand based on the dry sand of the saturated surface0And the dry water absorption T of the saturated surface of the sand based on the dry sand1。
Preferably, the dry water absorption T of the saturated surface of the sand is based on the dry sand of the saturated surface0As calculated by the following formula,
preferably, the dry water absorption T of the saturated surface of the sand is based on dry sand1As calculated by the following formula,
the invention has the beneficial effects that: the measuring device and the measuring method provided by the invention can accurately determine the sand saturation face dryness state, have high automation degree, are not influenced by operators and have high accuracy of test results.
Drawings
FIG. 1 is a schematic view showing the structure of an assay device in an example of the present invention;
FIG. 2 is a schematic flow chart of a measuring method in the example of the present invention;
FIG. 3 is a water loss process curve of a limestone artificial sand sample in an embodiment of the invention;
FIG. 4 is a water loss process curve of a natural sand sample in an embodiment of the present invention;
fig. 5 is a water loss process curve of a sandstone artificial sand sample in the embodiment of the invention.
In the figure: 1. a temperature and humidity control box; 2. an electronic balance; 3. an automatic acquisition and recording device; 4. an upper computer; 5. a sample tray; 6. pulling a rope; 7. a through hole; 8. and a data line.
Detailed Description
For purposes of promoting a better understanding of the objects, features, and advantages of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings, it being understood that the specific embodiments described herein are for purposes of illustrating the invention only and are not intended to limit the invention.
Example
As shown in fig. 1, the present embodiment provides an sandstone aggregate saturated surface dry water absorption rate measurement device, the measurement device includes a temperature and humidity control box 1, an automatic acquisition and recording device 3, an upper computer 4, an electronic balance 2 and a sample disc 5, a through hole 7 for communicating the inside of the temperature and humidity control box 1 with the outside is arranged at the top of the temperature and humidity control box 1, the sample disc 5 is connected with the electronic balance 2 through a pull rope 6, the pull rope 6 passes through the through hole 7 to suspend the sample disc 5 inside the temperature and humidity control box 1, the electronic balance 2 is connected with the automatic acquisition and recording device 3, and the automatic acquisition and recording device 3 is connected with the upper computer 4.
In this embodiment, the electronic balance 2 has a hook at the bottom, and the end of the pull rope 6 far away from the sample plate 5 is connected with the hook.
In this embodiment, the measuring range of the electronic balance 2 is not less than 5.0kg, and the precision of the electronic balance 2 is not less than 0.01 g.
In this embodiment, the distance between the pulling rope 6 and the circumferential wall of the through hole 7 is .
In this embodiment, temperature and humidity control box 1 can be according to actual demand temperature regulation and humidity, and the experimenter can adjust by oneself.
In this embodiment, will electronic balance 2 sets up the top upper surface of atmospheric control case 1 makes electronic balance 2 can very steady measurement, can not take place the slope and influence the measuring result, also can be convenient for simultaneously stay cord 6 passes through-hole 7 smoothly and connects on electronic balance 2.
In this embodiment, the electronic balance 2 is connected to the automatic acquisition and recording device 3 through a data line 8, and the automatic acquisition and recording device 3 can record the mass of the sample in the sample tray 5 obtained by the electronic balance 2 through measurement and the time corresponding to the mass, and transmit these data to the upper computer 4.
In this embodiment, the automatic acquisition and recording device 3 is connected with the upper computer 4 through a data line 8, and the upper computer 4 is provided with related software which can automatically calculate and draw a change curve of the water evaporation rate of the sample along with time according to the data transmitted by the automatic acquisition and recording device.
Example two
As shown in FIG. 2, in this example, there were provided sand aggregates saturated surface dry water absorption measurement methods using a measurement apparatus, which comprises the steps of,
s1, taking a proper amount of sand, filling the sand into a pretreatment container, and injecting clear water into the pretreatment container to enable the water surface to be 2cm higher than the sand; soaking the sand in clear water for 24 hours, and keeping the indoor temperature at 20 ℃;
s2, starting the temperature and humidity control box 1, and controlling the temperature in the temperature and humidity control box 1 to be 10-80 ℃ and the relative humidity to be 10-80%; opening the electronic balance 2, hanging the sample disc 5 on a hook of the electronic balance 2 by using the pull rope 6, and resetting the electronic balance 2;
s3, after sand is soaked for 24 hours, pouring out water in the pretreatment container, weighing quantitative sand as a sand sample, and flatly spreading the sand sample in the sample tray 5;
s4, starting the automatic acquisition and recording device 3 and the upper computer 4 to start measurement; after the quality of the sand sample does not change any more, adjusting the temperature of the temperature and humidity control box 1 to 105 ℃, drying the sand sample to constant weight, and recording the quality of the sand sample as G0；
S5, calculating and drawing a change curve of the moisture evaporation rate of the sand sample along with time according to the change of the sand sample quality along with time, finding out the inflection point time when the moisture evaporation rate begins to obviously decrease, and recording the sand sample quality G corresponding to the inflection point time1(ii) a The inflection time at which the rate of water evaporation begins to drop significantly is the time at which the sand reaches saturation face dryness;
s6, calculating the dry water absorption T of the saturated surface of the sand based on the dry sand of the saturated surface0And the dry water absorption T of the saturated surface of the sand based on the dry sand1。
In this example, the dry water absorption T of the saturated surface of the sand based on the dry sand of the saturated surface0As calculated by the following formula,
in this example, the dry water absorption T of the saturated surface of the sand based on the dry sand1As calculated by the following formula,
in this embodiment, the pretreatment vessel may be an enamel plate or the like.
In the embodiment, the determination of the saturated face dryness state of the sand adopts the following principle that under the conditions of constant temperature and humidity, the water evaporation rate of the sand in the water saturation state is mainly influenced by the specific surface area of particles, the surface water content, the pore structure of the particles and the surface structure, the water loss process is divided into a surface water loss stage and a pore water loss stage, the specific surface area of quantitative water-saturated sand is unchanged, the water evaporation rate is basically constant in the surface water loss stage, when the sand reaches the saturated face dryness state, the water evaporation rate is obviously reduced under the action of capillary, namely, the saturated face dryness state of the sand is determined by using the change point of the water evaporation rate of the sand.
EXAMPLE III
As shown in FIGS. 3 to 5, the sand used in this example was limestone artificial sand, and the measurement results were shown in Table 1, which was measured by the measuring apparatus of types in example and the measuring method of the second example, and the saturated dry water absorption of the sand of this example was measured by the method for measuring the saturated dry water absorption of the sand (test method) specified in the current national standard, and the results are shown in Table 1.
In this example, the sand used was natural river sand, and the measurement results were shown in table 1, which was measured by the measuring apparatus of example and the measuring method of example two, and the saturated surface dry water absorption of the sand of this example was measured by the method for measuring the saturated surface dry water absorption of the sand (test method) specified in the current national standard, and the results are shown in table 1.
In this example, the sand used was sandstone artificial sand, and the measurement results were shown in table 1, which was measured by the measuring apparatus of example and the measuring method of example two, and the saturated surface dry water absorption of the sand of this example was measured by the method for measuring the saturated surface dry water absorption of the sand (test method) specified in the current national standard, and the results are shown in table 1.
TABLE 1
In this embodiment, the measurement is performed according to the type of sand, and a change curve of the moisture evaporation rate of the sand sample with time is calculated and plotted according to the change of the mass of the sand sample with time. The graphs are shown in fig. 3 to 5.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained:
the invention provides a device and a method for measuring the saturated surface dry water absorption of sand aggregates, which can accurately determine the saturated surface dry state of the sand, have high automation degree, are not influenced by operators and have high precision of test results.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (7)
- The device for measuring the saturated surface dry water absorption of sandstone aggregates is characterized by comprising a temperature and humidity control box, an automatic acquisition and recording device, an upper computer, an electronic balance and a sample disc, wherein a through hole for communicating the inside of the temperature and humidity control box with the outside is formed in the top of the temperature and humidity control box, the sample disc is connected with the electronic balance through a pull rope, the pull rope penetrates through the through hole to hang the sample disc in the temperature and humidity control box, the electronic balance is connected with the automatic acquisition and recording device, and the automatic acquisition and recording device is connected with the upper computer.
- 2. The sandstone aggregate saturated surface dry water absorption measurement device of claim 1, wherein the bottom of the electronic balance is provided with a hook, and the end of the pull rope far away from the sample disc is connected with the hook.
- 3. The sandstone aggregate saturated surface dry water absorption measurement device of claim 2, wherein: the measuring range of the electronic balance is not less than 5.0kg, and the precision of the electronic balance is not less than 0.01 g.
- 4. The sand aggregate saturated surface dry water absorption measuring device according to claim 3, wherein the distance between the pulling rope and the circumferential wall of the through hole is mm.
- A method for measuring the saturated surface dry water absorption of sand aggregates, which is carried out by using the measuring apparatus of any of the above claims 1 to 4, , characterized in that the method comprises the steps of,s1, taking a proper amount of sand, filling the sand into a pretreatment container, and injecting clear water into the pretreatment container to enable the water surface to be 2cm higher than the sand; soaking the sand in clear water for 24 hours, and keeping the indoor temperature at 20 ℃;s2, starting a temperature and humidity control box, and controlling the temperature in the temperature and humidity control box to be 10-80 ℃ and the relative humidity to be 10-80%; opening the electronic balance, hanging the sample tray on a hook of the electronic balance by using the pull rope, and resetting the electronic balance;s3, after sand is soaked for 24 hours, pouring out water in the pretreatment container, weighing quantitative sand as a sand sample, and flatly spreading the sand sample in the sample tray;s4, starting the automatic acquisition and recording device and the upper computer to start measurement; after the quality of the sand sample does not change any more, adjusting the temperature of a temperature and humidity control box to 105 ℃, drying the sand sample to constant weight, and recording the quality of the sand sample as G0；S5, calculating and drawing a change curve of the moisture evaporation rate of the sand sample along with time according to the change of the sand sample quality along with time, finding out the inflection point time when the moisture evaporation rate begins to obviously decrease, and recording the sand sample quality G corresponding to the inflection point time1；S6, calculating the dry water absorption T of the saturated surface of the sand based on the dry sand of the saturated surface0And a sand saturated surface dry absorption device taking dry sand as a referenceWater rate T1。
- 6. The method for measuring the sand aggregate saturated surface dry water absorption according to claim 5, characterized in that: dry water absorption T of saturated surface of sand based on dry sand of saturated surface0As calculated by the following formula,
- 7. the method for measuring the sand aggregate saturated surface dry water absorption according to claim 5, characterized in that: dry water absorption T of saturated surface of sand based on dry sand1As calculated by the following formula,
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730156A (en) * | 2020-12-09 | 2021-04-30 | 中国水利水电第十六工程局有限公司 | Method for comprehensively measuring dry water absorption of artificial sand saturated surface |
| CN114018751A (en) * | 2021-10-29 | 2022-02-08 | 上海建工集团股份有限公司 | Device and method for continuously measuring saturated surface dry state of pre-wet aggregate |
| CN117686378A (en) * | 2024-02-02 | 2024-03-12 | 中国电建集团西北勘测设计研究院有限公司 | Method for measuring saturation surface dry water absorption rate of artificial fine aggregate |
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2019
- 2019-11-21 CN CN201911148274.4A patent/CN110736675A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730156A (en) * | 2020-12-09 | 2021-04-30 | 中国水利水电第十六工程局有限公司 | Method for comprehensively measuring dry water absorption of artificial sand saturated surface |
| CN114018751A (en) * | 2021-10-29 | 2022-02-08 | 上海建工集团股份有限公司 | Device and method for continuously measuring saturated surface dry state of pre-wet aggregate |
| CN117686378A (en) * | 2024-02-02 | 2024-03-12 | 中国电建集团西北勘测设计研究院有限公司 | Method for measuring saturation surface dry water absorption rate of artificial fine aggregate |
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