CN107643243B - Device and method for measuring porosity distribution of pervious concrete - Google Patents
Device and method for measuring porosity distribution of pervious concrete Download PDFInfo
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- CN107643243B CN107643243B CN201711042374.XA CN201711042374A CN107643243B CN 107643243 B CN107643243 B CN 107643243B CN 201711042374 A CN201711042374 A CN 201711042374A CN 107643243 B CN107643243 B CN 107643243B
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Abstract
The invention discloses a device and a method for measuring the porosity distribution of pervious concrete. The height adjusting device comprises a vernier, the vernier is installed on the upper portion of the vernier in a sliding fit mode, a fine adjusting device is installed above the vernier, and a hanging claw is fixed on the side wall of the vernier. The measuring device comprises a carrying device, a measuring cylinder and a water accumulation container. The device adopts an electronic digital display and fine adjustment device, can accurately control the position of a sample, can obtain the overall average porosity of the pervious concrete by measuring the water quantity discharged by a sample framework with a certain thickness, can obtain the porosity with a certain thickness at any position, and can obtain the porosity distribution of the pervious concrete by measuring the porosity with a certain thickness in sequence.
Description
Technical Field
The invention belongs to the technical field of porous medium porosity testing, and particularly relates to a device and a method for measuring porous concrete porosity distribution.
Background
The porous structure of the pervious concrete enables the pavement to have good water permeability, and rainwater can quickly infiltrate into the ground, so that flood disasters caused by urban storm are effectively reduced or eliminated, and the porous structure plays an important role in the construction of sponge cities in China. In order to be more close to engineering practice, the porous concrete sample is formed by adopting modes such as static pressure forming or vibration forming, and the porosity distribution is uneven after forming, and particularly in the compacting direction, the porous concrete sample adopting the static pressure forming mode often has the phenomenon that the upper porosity is small and the lower porosity is large along the compacting direction.
The properties of the permeable concrete such as strength and permeability coefficient are closely related to the porosity distribution of the sample, for example, the permeability coefficient of the permeable concrete often depends on a control section with the smallest area porosity, and in addition, the porosity distribution of the permeable concrete also influences the blocking rule, so that the measurement of the porosity distribution of the permeable concrete is significant for researching the permeable concrete. While most of the existing devices and methods for measuring permeable concrete are based on a buoyancy mass method or a vacuum sealing method, the porosities measured by the methods are all average porosities of the whole sample, and the measurement of the porosity distribution is difficult to realize.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for measuring the porosity distribution of permeable concrete, wherein the device adopts an electronic digital display and a fine adjustment device, can accurately control the position of a sample, can obtain the overall average porosity of the permeable concrete by measuring the water discharged by a sample skeleton with a certain thickness, can obtain the porosity with a certain thickness at any position, and can obtain the porosity distribution of the permeable concrete by sequentially measuring the porosity with a certain thickness.
In order to solve the technical problems, the invention provides the following technical scheme: the device for measuring the porosity distribution of the pervious concrete comprises a base, wherein a support shaft is vertically arranged on the base, a height adjusting device is arranged on the support shaft, and a measuring device is arranged on the height adjusting device.
The support shaft comprises a lower rod, a middle limiting block is sleeved on the lower rod, the part above the middle limiting block is an upper ruler body, and a top limiting block is fixed at the top of the lower rod.
The height adjusting device comprises a vernier, the vernier is installed on the upper portion of the vernier in a sliding fit mode, a fine adjusting device is installed above the vernier, and a hanging claw is fixed on the side wall of the vernier.
The measuring device comprises a carrying device, a measuring cylinder and a water accumulation container.
The bottom of base installs a plurality of stabilizer blades.
The upper ruler body is marked with scales and is provided with a fixed grid, and the fixed grid is matched with a movable grid arranged on the vernier to form a grid-containing sensor.
The ponding container is provided with an overflow hole and a water inlet hole, and the water inlet hole is provided with a valve.
The object carrying device comprises a hanging wire, one end of the hanging wire is connected to the object hanging claw, the other end of the hanging wire is connected with a bottom tray, and a large number of holes are formed in the bottom tray.
The vernier is provided with an electronic display screen and a zero return key.
A second limit screw is arranged at the position where the vernier is matched with the upper ruler body; the position of the fine tuning device matched with the upper ruler body is provided with a first limit screw.
And a level bubble is arranged on the base.
The method for measuring the porosity distribution of the permeable concrete by using any permeable concrete porosity distribution measuring device is characterized by comprising the following steps of:
step1: adjusting the support legs to enable the liquid beads in the level bubble to be in the middle position;
step2: respectively unscrewing the first limit screw and the second limit screw, sliding the vernier to the top of the upper ruler body, and respectively screwing the second limit screw and the first limit screw;
step 3: placing the water accumulation container on the base, filling water into the water accumulation container from the water inlet hole until water overflows from the water overflow hole, and closing the valve;
step 4: mounting the object carrying device on the object carrying claw, and placing the sample on a bottom tray of the object carrying device;
step 5: loosening the first limit screw and the second limit screw respectively, slowly sliding the vernier until the bottom of the sample approaches the bottom of the overflow hole, tightening the first limit screw, adjusting the fine adjustment device until the bottom of the sample is flush with the bottom of the overflow hole, tightening the second limit screw, and then pressing a return-to-zero key of the vernier;
step6: placing the measuring cylinder on a base, respectively unscrewing a first limit screw and a second limit screw, slowly sliding a vernier downwards until the reading of a display screen is close to m millimeters, screwing the first limit screw, adjusting the fine adjustment device until the reading of the display screen is m millimeters, screwing the second limit screw, recording the reading V1 of the measuring cylinder, and taking the total volume of a hole with the thickness of m millimeters and a framework of a sample as V, wherein the porosity of the m millimeters of the sample is n1= (V-V1)/V;
step 7: and (5) sequentially measuring the whole sample according to Step6 at the thickness of m millimeters, and finally obtaining the distribution of the porosity along the height.
The invention has the following beneficial effects:
1. the invention can measure the overall average porosity of the pervious concrete, can measure the porosity of any position with a certain thickness, and can obtain the porosity distribution of the pervious concrete by sequentially measuring the porosity with a certain thickness.
2. The electronic digital display and the fine adjustment device are adopted, so that the position of the sample and the porosity of a certain thickness of the measured sample can be accurately controlled.
3. The tray, the water accumulation container and the measuring cylinder can be removed and replaced, so that the device is favorable for carrying and can be used for samples with different sizes.
4. The leveling bubble and the supporting leg with adjustable height are arranged, and the leveling bubble can be used for uneven ground.
5. The whole device has simple structure and convenient operation.
Drawings
The invention is further described below with reference to the drawings and examples.
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a plot of sample porosity versus height for example 3.
In the figure, a base 1, a support leg 2, a lower rod 3, a middle limiting block 4, an upper ruler body 5, a top limiting block 6, a level bubble 7, a vernier 8, a fine adjusting device 9, a hanging claw 10, a first limit screw 11, a second limit screw 12, a measuring cylinder 13, a water accumulation container 14, an overflow hole 15, a water inlet hole 16, a hanging wire 17 and a bottom tray 18.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, the device for measuring the porosity distribution of the pervious concrete comprises a base 1, wherein a support shaft is vertically arranged on the base 1, a height adjusting device is arranged on the support shaft, and a measuring device is arranged on the height adjusting device.
Further, the support shaft comprises a lower rod 3, a middle limiting block 4 is sleeved on the lower rod 3, the part above the middle limiting block 4 is an upper ruler body 5, and a top limiting block 6 is fixed on the top of the lower rod 3. The height adjusting device comprises a vernier 8, the vernier 8 is installed on the upper ruler body 5 in a sliding fit mode, a fine adjusting device 9 is installed above the vernier 8, and a hanging claw 10 is fixed on the side wall of the vernier 8. The measuring device comprises a carrying device, a measuring cylinder 13 and a water accumulation container 14.
Further, a plurality of support legs 2 are installed at the bottom of the base 1. The height of the support legs 2 can be adjusted, and then the levelness of the base 1 can be adjusted.
Further, the upper ruler body 5 is marked with scales and is provided with a fixed grid, and the fixed grid is matched with a movable grid arranged on the vernier 8 to form a grid-containing sensor.
Further, the water accumulation container 14 is provided with an overflow hole 15 and a water inlet hole 16, and the water inlet hole 16 is provided with a valve.
Further, the carrying device comprises a hanging wire 17, one end of the hanging wire 17 is connected to the hanging claw 10, the other end of the hanging wire is connected to a bottom tray 18, and a plurality of holes are formed in the bottom tray 18. The water permeation is ensured through the holes.
Further, the vernier 8 is provided with an electronic display screen and a zero return key. The convenience of reading is guaranteed through the electronic display screen, and zeroing is facilitated through the zeroing key.
Further, a second limit screw 12 is arranged at the position where the vernier 8 is matched with the upper ruler body 5; the position of the fine tuning device 9 matched with the upper ruler body 5 is provided with a first limit screw 11. The position of the screw is conveniently adjusted through the limit screw.
Further, a level bubble 7 is arranged on the base 1.
Example 2:
the method for measuring the porosity distribution of the permeable concrete by using any permeable concrete porosity distribution measuring device is characterized by comprising the following steps of:
step1: adjusting the support legs 2 to enable the liquid beads in the level bubble to be in the middle position;
step2: loosening the first limit screw 11 and the second limit screw 12 respectively, sliding the vernier 8 to the top of the upper ruler body 5, and tightening the second limit screw 12 and the first limit screw 11 respectively;
step 3: the water accumulation container 14 is placed on the base 1, water is filled into the water accumulation container 14 from the water inlet hole 16 until water overflows from the water overflow hole 15, and the valve is closed;
step 4: mounting the carrying device on the carrying claw 10, and placing the sample on a bottom tray 18 of the carrying device;
step 5: respectively unscrewing a first limit screw 11 and a second limit screw 12, slowly sliding the vernier 8 downwards until the bottom of the sample approaches the bottom of the overflow hole 15, screwing the first limit screw 11, adjusting the fine adjustment device 9 until the bottom of the sample is flush with the bottom of the overflow hole 15, screwing the second limit screw 12, and then pressing a zero-resetting key of the downstream vernier 8;
step6: placing a measuring cylinder 13 on the base 1, respectively unscrewing a first limit screw 11 and a second limit screw 12, slowly sliding the vernier 8 downwards until the display screen reading is close to m millimeters, screwing the first limit screw 11, adjusting the fine adjustment device 9 until the display screen reading is m millimeters, screwing the second limit screw 12, recording the reading V1 of the measuring cylinder 13, and recording the total volume of a hole and a framework with the thickness of m millimeters of a sample as V, wherein the porosity of the m millimeters of the sample is n 1= (V-V1)/V;
step 7: and (5) sequentially measuring the whole sample according to Step6 at the thickness of m millimeters, and finally obtaining the distribution of the porosity along the height.
Example 3:
the sample is cylindrical pervious concrete obtained by adopting a static pressure molding mode in laboratory simulation actual engineering, the height and the diameter are 120mm and 100mm respectively, the bottom of the overflow hole 15 is 125mm from the bottom of the water accumulation container 14, the diameter of the water accumulation container 14 is 120mm, and the measuring range and the precision of the vernier scale 8 are 150mm and 0.1mm respectively.
Step1: adjusting the support legs 2 so that the liquid beads in the level bubble 7 are in the middle position;
step2: loosening the first limit screw 11 and the second limit screw 12 respectively, sliding the vernier 8 to the top of the upper ruler body 5, and tightening the second limit screw 12 and the first limit screw 11 respectively;
step 3: the water accumulation container 14 is placed on the base 1, water is filled into the water accumulation container 14 from the water inlet hole 16 until water overflows from the water overflow hole 15, and the valve is closed;
step 4: mounting the carrying device on the carrying claw 10, placing the sample on a bottom tray 18 of the carrying device, and placing the compacting surface above;
step 5: respectively unscrewing a first limit screw 11 and a second limit screw 12, slowly sliding the vernier 8 downwards until the bottom of the sample approaches the bottom of the overflow hole 15, screwing the first limit screw 11, adjusting the fine adjustment device 9 until the bottom of the sample is flush with the bottom of the overflow hole 15, screwing the second limit screw 12, and then pressing a zero-resetting key of the downstream vernier 8;
step6: placing a measuring cylinder 13 on the base 1, respectively unscrewing a first limit screw 11 and a second limit screw 12, slowly sliding a vernier 8 downwards until the display screen reading is close to 10mm, screwing the first limit screw 11, adjusting the fine adjustment device 9 until the display screen reading is 10mm, screwing the second limit screw 12, recording the reading V1 of the measuring cylinder 13, and keeping the total volume of a 10 mm-thick pore and a framework of a sample as V=10xpi×50 2 The sample has a porosity of n1= (V-V1)/V of this 10mm thickness;
step 7: the whole sample was measured sequentially at a thickness of 10mm according to Step6, and the distribution of porosity along the height was finally obtained.
The test results are shown in table 1 and fig. 2: table 1 shows the porosity of each layer of the sample; FIG. 2 is a distribution of sample porosity along the height. The overall average porosity of the sample was 26.05%, but the porosity of each layer was greatly different, and the overall rule of the sample in the compacting direction was that the upper porosity was small and the lower porosity was large.
Table 1 sample porosity of each layer
From the above description, it is apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the technical spirit of the invention. The present invention is not limited to the prior art.
Claims (3)
1. The method for measuring the porous concrete porosity distribution is realized by adopting a device for measuring the porous concrete porosity distribution, the device for measuring the porous concrete porosity distribution comprises a base (1), a support shaft is vertically arranged on the base (1), a height adjusting device is arranged on the support shaft, and a measuring device is arranged on the height adjusting device;
the bracket shaft comprises a lower rod (3), a middle limiting block (4) is sleeved on the lower rod (3), an upper ruler body (5) is arranged on the part above the middle limiting block (4), and a top limiting block (6) is fixed on the top of the lower rod (3);
the height adjusting device comprises a vernier (8), the vernier (8) is installed on the upper ruler body (5) in a sliding fit manner, a fine adjusting device (9) is installed above the vernier (8), and a hanging claw (10) is fixed on the side wall of the vernier (8);
the measuring device comprises a carrying device, a measuring cylinder (13) and a water accumulation container (14);
the bottom of the base (1) is provided with a plurality of supporting feet (2);
the water accumulation container (14) is provided with an overflow hole (15) and a water inlet hole (16), and the water inlet hole (16) is provided with a valve;
the object carrying device comprises a hanging wire (17), one end of the hanging wire (17) is connected to the object carrying claw (10), the other end of the hanging wire is connected with a bottom tray (18), and a large number of holes are formed in the bottom tray (18);
a second limit screw (12) is arranged at the position of the vernier (8) matched with the upper ruler body (5); the position of the fine adjustment device (9) matched with the upper ruler body (5) is provided with a first limit screw (11);
a level bubble (7) is arranged on the base (1);
the method is characterized by comprising the following steps of:
step1: adjusting the support legs (2) to enable the liquid beads in the level bubble (7) to be in the middle position;
step2: loosening the first limit screw (11) and the second limit screw (12) respectively, sliding the vernier (8) to the top of the upper ruler body (5), and tightening the second limit screw (12) and the first limit screw (11) respectively;
step 3: the water accumulation container (14) is placed on the base (1), water is poured into the water accumulation container (14) from the water inlet hole (16) until water overflows from the water overflow hole (15), and the valve is closed;
step 4: mounting the carrying device on the carrying claw (10), and placing the sample on a bottom tray (18) of the carrying device;
step 5: loosening a first limit screw (11) and a second limit screw (12) respectively, slowly sliding the vernier (8) downwards until the bottom of the sample approaches the bottom of the overflow hole (15), tightening the first limit screw (11), adjusting the fine adjustment device (9) until the bottom of the sample is flush with the bottom of the overflow hole (15), tightening the second limit screw (12), and then pressing a return-to-zero key of the vernier (8);
step6: placing a measuring cylinder (13) on a base (1), respectively unscrewing a first limit screw (11) and a second limit screw (12), slowly sliding a vernier (8) downwards until the reading of a display screen is close to m millimeters, screwing the first limit screw (11), adjusting a fine adjustment device (9) until the reading of the display screen is m millimeters, screwing the second limit screw (12), recording the reading V1 of the measuring cylinder (13), and taking the total volume of a hole and a framework with the thickness of m millimeters as a sample, wherein the porosity of the sample with the thickness of m millimeters is n 1= (V-V1)/V;
step 7: and (5) sequentially measuring the whole sample according to Step6 at the thickness of m millimeters, and finally obtaining the distribution of the porosity along the height.
2. The method for measuring the porosity distribution of permeable concrete according to claim 1, wherein: the upper ruler body (5) is marked with scales and is provided with a fixed grid, and the fixed grid is matched with a movable grid arranged on the vernier (8) to form a grid-containing sensor.
3. The method for measuring the porosity distribution of permeable concrete according to claim 1, wherein: the vernier (8) is provided with an electronic display screen and a zero return key.
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| CN110095398B (en) * | 2019-05-05 | 2021-08-10 | 三峡大学 | Device and method for measuring porosity by using magnetofluid |
| CN110174340B (en) * | 2019-05-31 | 2021-04-02 | 武汉理工大学 | Method and device for testing layered porosity of solid porous material |
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