CN213580543U - Test device for detecting content of coarse aggregate of premixed concrete - Google Patents
Test device for detecting content of coarse aggregate of premixed concrete Download PDFInfo
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- CN213580543U CN213580543U CN202022346486.8U CN202022346486U CN213580543U CN 213580543 U CN213580543 U CN 213580543U CN 202022346486 U CN202022346486 U CN 202022346486U CN 213580543 U CN213580543 U CN 213580543U
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Abstract
The utility model discloses a test device for detecting the content of coarse aggregate in ready-mixed concrete, which comprises a base, a high-frequency vibration table fixed on the base through a steel spring, and a transparent cylinder fixed on the high-frequency vibration table and provided with a cover plate at the top, wherein a stainless steel screen cylinder is placed in the transparent cylinder, and the transparent cylinder is also provided with a water inlet and a water outlet; also comprises a weighing device. The utility model discloses the device is the test device who is used for detecting premixed concrete coarse aggregate content specially, and this test device has overcome the problem that exists among the current test process of washing method, in this test device use, need not reuse power and presses down the sieve of placing on the shaking table, also need not to add the concrete many times and sieve to wash the sewage after the concrete and adopt a sewage section of thick bamboo, no longer polluted environment, this test device has portable, easy operation, the advantage that using water wisely and measuring accuracy are high.
Description
Technical Field
The utility model relates to a test device for detecting premixed concrete coarse aggregate content.
Background
The concrete mainly comprises cement, mineral admixture, fine aggregate and coarse aggregate, wherein the mass of the coarse aggregate accounts for 35-48% of that of the single-component concrete. The quality, the gradation and the dosage of the coarse aggregate are directly related to the crack resistance of the concrete, and in the aspect of mix proportion design, in order to reduce the cracking risk of the concrete, the dosage of the coarse aggregate is as much as possible so as to improve the volume stability of the concrete, and generally the dosage of the single-component concrete coarse aggregate is not lower than 1050 kg.
The detection of the content of the coarse aggregate in the concrete can adopt a washing method, a certain amount of concrete is placed on a 4.75mm square-hole sieve, the concrete is washed by using a water pipe, particles with nominal particle size smaller than 4.75mm are screened out, and the mass of the remaining stones is used for calculating the content of the coarse aggregate in the concrete. This process has the following disadvantages: (1) the capacity of the 4.75mm square-hole sieve is small, and concrete needs to be added for multiple times for sieving; (2) the cohesiveness of the concrete mixture is good, a vibration table is needed when coarse aggregates are screened, but a screen on the vibration table cannot be fixed, and the screen needs to be pressed forcefully; (3) the washing water consumption is large, and the washing water contains cement paste, so that the sewage discharge pollutes the environment. No special equipment is currently available on the market for this test.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model discloses do not have the device that detects the coarse aggregate content of ready-mixed concrete specially among the prior art, provide a test device for detecting the coarse aggregate content of ready-mixed concrete.
The technical scheme is as follows: the test device for detecting the content of the coarse aggregate of the premixed concrete comprises a base, a high-frequency vibration table fixed on the base through a steel spring, and a transparent cylinder fixed on the high-frequency vibration table and provided with a cover plate at the top, wherein a stainless steel screen cylinder is placed in the transparent cylinder, and the transparent cylinder is also provided with a water inlet and a water outlet; also comprises a weighing device.
The weighing device is a suspended electronic scale with a hook, and the suspended electronic scale is fixed on the base through a support rod.
Wherein the mesh aperture of the screen cylinder is 4.75 mm.
Wherein, the transparent cylinder is a glass cylinder or an acrylic cylinder.
The water inlet on the transparent barrel is connected with an external water tap through a connecting hose, and the water outlet is connected with the sewage barrel.
Wherein, the stainless steel handle is arranged at the top of the stainless steel screen cylinder.
Has the advantages that: the utility model discloses the device is the test device who is used for detecting premixed concrete coarse aggregate content specially, the problem that exists in the current method of washing test process has been overcome to this test device, in this test device use, need not reuse power and press down the sieve of placing on the shaking table, also need not to add the concrete many times and sieve, and the sewage that washes behind the concrete adopts a sewage section of thick bamboo, no longer polluted environment, this test device has portable, easy operation, the advantage that using water wisely and measuring accuracy are high, can be used for the coarse aggregate content testing of concrete mixing plant concrete outgoing quality detection or job site concrete.
Drawings
Fig. 1 is a schematic structural diagram of the testing device of the present invention.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model discloses a test device for detecting premixed concrete coarse aggregate content, including base 1, high-frequency vibration platform 3 fixed on base 1 through steel spring 2 and fix on high-frequency vibration platform 3 transparent barrel 4 of top area apron, transparent barrel 4 is glass barrel or ya keli barrel, cylindrical stainless steel screen cloth barrel 5 has been placed in transparent barrel 4, the mesh aperture of screen cloth barrel 5 is 4.75mm, stainless steel handle 12 is equipped with at the top of stainless steel screen cloth barrel 5; the transparent barrel 4 is also provided with a water inlet 6 and a water outlet 7, the water inlet 6 on the transparent barrel 4 is connected with an external water tap through a connecting hose, and the water outlet 7 is connected with a sewage cylinder 11; the utility model discloses test device still includes weighing device, and weighing device is the suspension type electronic scale 9 of taking couple 8, and suspension type electronic scale 9 passes through bracing piece 10 to be fixed on base 1.
The utility model is used for detect test device's of premixed concrete coarse aggregate content test process:
firstly, testing the mass per unit volume of the concrete mixture:
(1) a certain amount of concrete mix was weighed into a 5L volumetric cylinder (the mass of the 5L volumetric cylinder is known and is m)1) Vibrating on a high-frequency vibration table for 5-10 s;
(2) scraping the excessive concrete mixture at the opening of the cylinder, leveling the surface, wiping the outer wall of the capacity cylinder, and weighing the mass of the capacity cylinder by using a weighing device (the mass is the total mass m of the concrete mixture and the capacity cylinder)2)；
(3) Calculating the apparent density (rho) of the concrete mixture:
in the formula: rho-apparent density of concrete mixture (kg/m)3) To the accuracy of 10kg/m3；
m1-volumetric drum mass (kg);
m2volumetric cylinder and total mass of sample (kg);
v-volumetric cylinder volume (L);
thereby obtaining the mass per unit volume (m) of the concrete mixture:
m＝ρ×V1
in the formula: m-mass per unit volume (kg) of the mixture;
rho-apparent Density of concrete mixture (kg/m)3) To the accuracy of 10kg/m3；
V1Unit volume (m) of concrete mixture3) And the value is 1.
Secondly, measuring the percentage (alpha) of the aggregate with the nominal grain diameter larger than 5mm in the single-side concrete mixture:
(1) the concrete mixture in the volumetric cylinder is put into a cylindrical screen cylinder body 5 with a square hole of 4.75mm, the screen cylinder body 5 is put into an organic glass cylinder 4, and the organic glass cylinder 4 is fixed on a high-frequency vibration table 3;
(2) connecting a water tap to a water inlet 6 by using a rubber hose, starting a high-frequency vibration table 3 and a water pipe valve, vibrating and screening concrete mixtures, wherein cement mortar with the nominal particle size of less than 5mm flows into an organic glass cylinder 4 through a screen with the particle size of 4.75mm, and flows into a sewage cylinder 11 (the volume of the sewage cylinder 11 is 5L) through a water outlet 7;
(3) observing the screening state of the concrete in the screen cylinder 5 until only coarse aggregates with the nominal particle size larger than 5mm remain in the screen cylinder 5, wiping the surface moisture of the coarse aggregates by using a dry towel, keeping the saturated surface dry water absorption state, and weighing the mass of the screened coarse aggregates by using an electronic scale 9; the coarse aggregate mass (m) is obtained3)；
(4) Calculating the aggregate percentage (alpha) of the concrete with the nominal grain diameter larger than 5 mm:
in the formula: percent (%) of aggregate having an alpha-nominal particle size of greater than 5 mm;
m3-mass (kg) of aggregates having a nominal particle size of more than 5 mm;
m1-volumetric drum mass (kg);
m2volumetric cylinder and total mass of sample (kg).
(5) Calculating the stone content (m) of the concrete0)：
m0＝m×α
In the formula: m is0-stone content (kg) of the concrete;
percentage (%) of aggregate having an alpha-nominal particle diameter of more than 5 mm.
Claims (6)
1. The utility model provides a test device for detecting premixed concrete coarse aggregate content which characterized in that: the stainless steel screen cloth barrel is placed in the transparent barrel, and a water inlet and a water outlet are further formed in the transparent barrel; also comprises a weighing device.
2. The test device for detecting the content of the coarse aggregate of the ready-mixed concrete according to claim 1, characterized in that: the weighing device is a suspended electronic scale with a hook, and the suspended electronic scale is fixed on the base through a support rod.
3. The test device for detecting the content of the coarse aggregate of the ready-mixed concrete according to claim 1, characterized in that: the mesh aperture of the screen cylinder is 4.75 mm.
4. The test device for detecting the content of the coarse aggregate of the ready-mixed concrete according to claim 1, characterized in that: the transparent cylinder is a glass cylinder or an acrylic cylinder.
5. The test device for detecting the content of the coarse aggregate of the ready-mixed concrete according to claim 1, characterized in that: the water inlet on the transparent barrel is connected with an external faucet through a connecting hose, and the water outlet is connected with the sewage barrel.
6. The test device for detecting the content of the coarse aggregate of the ready-mixed concrete according to claim 1, characterized in that: the top of the stainless steel screen cylinder body is provided with a stainless steel handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022346486.8U CN213580543U (en) | 2020-10-20 | 2020-10-20 | Test device for detecting content of coarse aggregate of premixed concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022346486.8U CN213580543U (en) | 2020-10-20 | 2020-10-20 | Test device for detecting content of coarse aggregate of premixed concrete |
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| CN213580543U true CN213580543U (en) | 2021-06-29 |
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| CN202022346486.8U Active CN213580543U (en) | 2020-10-20 | 2020-10-20 | Test device for detecting content of coarse aggregate of premixed concrete |
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