CN212621777U - Pervious concrete slurry uniformity test device - Google Patents
Pervious concrete slurry uniformity test device Download PDFInfo
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- CN212621777U CN212621777U CN202021216239.XU CN202021216239U CN212621777U CN 212621777 U CN212621777 U CN 212621777U CN 202021216239 U CN202021216239 U CN 202021216239U CN 212621777 U CN212621777 U CN 212621777U
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Abstract
The utility model discloses a concrete slurry uniformity test device permeates water, test device includes that base, shaking table and bottom seal and upper end open-ended cube container, and the shaking table is fixed on the base, the cube container sets up on the shaking table, the cube container comprises last casing, well casing and lower casing. During the uniformity evaluation test, the freshly mixed pervious concrete is firstly filled into the cubic container in two layers, the freshly mixed pervious concrete is uniformly inserted from the edge to the center of the cubic container in the filling process of each layer, the pervious concrete is vibrated to be compact, the quality of the pervious concrete of the upper shell, the middle shell and the lower shell is respectively weighed and calculated, and the uniformity of the pervious concrete is evaluated through the quality of slurry. The utility model discloses can accurately, high-efficient, evaluate the inside homogeneity of concrete that permeates water quantitatively, ensure the mechanical strength and the water permeability of the concrete that permeates water and coordinate each other.
Description
Technical Field
The utility model belongs to the technical field of the concrete work capability test that permeates water, especially, relate to a concrete slurry uniformity test device permeates water.
Background
The pervious concrete is a porous ecological environment-friendly pervious material which is formed by stirring aggregate, sand (little or no), cement, water, an additive, an admixture and the like, and has important significance for groundwater replenishment, vegetation growth promotion, ecological balance maintenance and urban heat island effect alleviation. Because pervious concrete's porosity is many, the slurry volume is few, the characteristics that the slump is low, vibration equipment type, vibration time etc. have important influence to the distribution of slurry in the material inside, if adopt shaking table vibration time overlength, because of aggregate content is high, inside porosity is big, easily produce between the aggregate and inlay crowded effect, the slurry moves down under the effect of excitation force, leads to the slurry to gather in the test piece bottom, and upper portion slurry is not enough, produces adverse effect to the intensity and the coefficient of permeating water of pervious concrete test piece. Meanwhile, the newly-mixed pervious concrete is easy to cause the problem of slurry and aggregate layering due to external forces such as jolt, vibration and the like in the construction and transportation process, and the mechanical property and the water permeability of the newly-mixed pervious concrete after hardening are difficult to meet the expected requirements due to the nonuniformity of materials. Therefore, the uniformity of the pervious concrete slurry distribution is crucial to the mix proportion design, construction quality control and service performance of the material.
Therefore, accurate and rapid evaluation of the uniformity of the pervious concrete slurry is an important prerequisite for coordinating the mechanics and the water permeability; at present, the working performance evaluation of freshly mixed pervious concrete by scholars at home and abroad comprises qualitative methods of 'hand grabbing conglobation', comprehensive consistency index, porosity uniformity, slurry quality and the like. A Chinese patent is named as: a device and a method for testing the workability of freshly mixed pervious concrete are disclosed, and the application numbers are as follows: 201710965302.6, which discloses quantitative evaluation of the workability of pervious concrete by quantitatively measuring the difference in porosity of upper and lower layers after the pervious concrete has been vibrated by image processing techniques. The non-uniformity of porosity may reflect the workability of the material, but the interfaces obtained are limited and lack representativeness. Another chinese patent is named: a test device and a method for evaluating the working performance of pervious concrete are disclosed, and the application numbers are as follows: CN201611231212.6, this patent discloses that after the freshly mixed pervious concrete is vibrated, the slurry quality passing through the grid is weighed to evaluate the working performance of the pervious concrete, the slurry quality is used as a comprehensive index to better characterize the working performance of the material, and the slurry flows with a certain orientation under the coupling action of the self gravity and the external excitation force. Therefore, the quality of the slurry passing through the grid can only be evaluated by evaluating the flow of the slurry at the bottom of the material, but the difference of the distribution of the slurry at other positions in the material cannot be revealed, and the heterogeneity of the freshly mixed pervious concrete is difficult to reflect objectively.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a concrete slurry homogeneity test device permeates water, the utility model discloses can effectively solve the evaluation index lack the representativeness and with the problem of the concrete homogeneity that permeates water of local area's slurry quality evaluation to reveal the concrete slurry at the inside difference nature that other positions of material distribute, reached scientific, accurate, ration, appraise the distribution homogeneity of the different positions slurry of material fast, realized its mechanical properties and the coordination of the function of permeating water. In order to achieve the above purpose, the utility model adopts the following technical scheme:
according to one aspect of the utility model, a pervious concrete slurry uniformity test device is provided, the test device comprises a base, a vibration table and a cubic container with a closed bottom end and an open upper end, the vibration table is fixed on the base, and the cubic container is arranged on the vibration table; the cube container is vertical upper casing, well casing and the lower casing that assembles the connection and constitutes from top to bottom, the bottom of casing is sealed down, the upper end opening go up the outer wall all around of casing, the outer wall all around of well casing and the outer wall all around of casing down and be provided with the engaging lug respectively, go up between adjacent outer wall of casing and well casing between and the outer wall of well casing between adjacent and the outer wall of well casing and the outer wall of casing down pass through engaging lug and bolt interconnect respectively.
In a preferred embodiment of the present invention, the upper opening of the lower casing and the inner wall of the upper opening of the middle casing are provided with support steps, the lower opening of the middle casing and the lower opening of the upper casing are respectively provided with insertion portions that contract toward the inside of the casing, the insertion portion of the lower opening of the middle casing is inserted into the support step of the upper opening of the lower casing, and the insertion portion of the lower opening of the upper casing is inserted into the support step of the upper opening of the middle casing.
In a further preferred aspect of the above aspect, the outer wall of the upper opening of the lower case and the outer wall of the lower opening of the middle case and the outer wall of the upper opening of the middle case and the outer wall of the lower opening of the upper case are connected to each other by a connecting lug and a bolt.
In a further preferable mode of the above scheme, the inner lengths and inner widths of the upper shell, the middle shell and the lower shell are 150mm to 180 mm; the heights of the upper shell, the middle shell and the lower shell are all 50-80 mm; the thickness of the upper shell, the middle shell and the lower shell is not less than 5 mm.
In a further preferred aspect of the above aspect, a container lid is provided at the upper opening of the upper case, and an outer wall of the container lid is connected to an outer wall of the upper case by a snap.
According to a further preferred embodiment of the above scheme, the container cover body comprises an outer cover body, an annular support platform arranged on the inner wall of the outer cover body, and a pressure-bearing block body arranged between the top end of the inner wall of the outer cover body and the annular support platform in a sliding manner, wherein a buffer cavity is formed between the top end of the pressure-bearing block body and the top end of the inner wall of the outer cover body, the pressure-bearing block body is inserted into the inner wall of the upper opening of the upper shell in a matching manner, and the inner wall of the outer cover body is.
In a further preferred embodiment of the above scheme, an elastic member is disposed in the buffer cavity, and the top of the pressure-bearing block is connected with the top end of the inner wall of the outer cover through the elastic member.
In a further preferred embodiment of the above solution, the base is provided with a rotating table, and the vibrating table is fixed to the base through the rotating table.
To sum up, because the utility model adopts the above technical scheme, the utility model discloses following technological effect has:
the utility model discloses a test of the concrete slurry quality that permeates water of the different regions of last casing, well casing and lower casing of test cube container, and provided an accurate, high-efficient, ration with aggregate surface area, slurry quality and airspace distribution as the test device of the homogeneity evaluation of the concrete that permeates water of characteristics, thereby effectively solved the evaluation index and lacked the problem of representativeness and with the slurry quality evaluation concrete homogeneity of local region, thereby reveal the concrete slurry difference of other position distributions in the material, thereby can reflect the homogeneity of the concrete that permeates water newly objectively; the utility model discloses reached scientific, accurate, ration, appraised the distribution homogeneity of the different position slurries of material fast, realized its mechanical properties and the coordination of the function of permeating water.
Drawings
Fig. 1 is a schematic structural diagram of a permeable concrete slurry uniformity testing device of the present invention;
FIG. 2 is a schematic view of the cubic container of the present invention;
fig. 3 is a schematic view of the internal structure of the cubic container of the present invention;
fig. 4 is a top view of the cubic container of the present invention;
fig. 5 is a schematic view of the structure of the container top of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and by referring to preferred embodiments. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
Example 1
The embodiment provides a pervious concrete slurry uniformity test device, which is shown in fig. 1 and fig. 2, and comprises a base 10, a vibration table 11 and a cubic container 100 with a closed bottom end and an open upper end, wherein the vibration table 11 is fixed on the base 10, the cubic container 10 is arranged on the vibration table 11, in the utility model, a rotating table 13 can be further arranged on the base 10, and the vibration table 11 is fixed on the base 10 through the rotating table 13; thereby conveniently vibrate and insert the concrete body, accelerate the difference of the speed that the different positions of concrete body distribute and different position distributions in the different casings of material, and then improve the efficiency of concrete degree of consistency evaluation.
As shown in fig. 2, 3 and 4, the cubic container 100 is vertically and detachably assembled and connected with the upper casing 1, the middle casing 2 and the lower casing 3 from top to bottom, the bottom end of the lower casing 3 is closed, and the upper end of the lower casing 3 is open, the peripheral outer walls of the upper casing 1, the peripheral outer walls of the middle casing 2 and the peripheral outer walls of the lower casing 3 are respectively provided with a connecting lug 101, and the outer walls of the upper casing 1 and the middle casing 2 between adjacent parts and the outer walls of the middle casing 2 and the outer walls of the lower casing 3 between adjacent parts are respectively connected with each other through the connecting lug 101 and a bolt 102; 4 symmetrical connecting lugs 101 are arranged on the peripheral side wall of the bottom of each shell, the connecting lugs 101 are steel sheets with holes, and the steel sheets are distributed identically; screw holes 101a are formed in the connecting lugs 101, bolts 102 are GB 70-85M 5X 20, and after the connecting lugs 101 on the upper shell 1 and the middle shell 2 and the lower shell 3 are aligned with each other, the bolts 102 are inserted into the screw holes 101a so as to fixedly connect the adjacent shells; the outer wall of the upper opening of the lower shell 3 and the outer wall of the lower opening of the middle shell 2 and the outer wall of the upper opening of the middle shell 2 and the outer wall of the lower opening of the upper shell 1 are connected with each other through connecting lugs 101 and bolts 102, so that the cubic container 100 can be quickly mounted and dismounted, and each layer of concrete slurry can be quickly prepared; the inner length and the inner width of the upper shell 1, the middle shell 2 and the lower shell 3 are 150 mm-180 mm; the upper part, the middle part and the lower part of the bracket are respectively 150mm in inner length and inner width and 50 mm-80 mm in height; the rear ends of the upper shell 1, the middle shell 2 and the lower shell 3 are not less than 5 mm.
In the present invention, as shown in fig. 1 and 5, a container cover 12 is disposed at the upper opening portion of the upper casing 1, and the outer wall of the container cover 12 is connected to the outer wall of the upper casing 1 by a buckle, so that the container cover 12 can be conveniently detached to fill the pervious concrete slurry; the container cover 12 comprises an outer cover 120, an annular support table 121 arranged on the inner wall of the outer cover 120, and a pressure-bearing block 122 slidably arranged between the top end of the inner wall of the outer cover 120 and the annular support table 121, wherein a buffer cavity 123 is formed between the top end of the pressure-bearing block 122 and the top end of the inner wall of the outer cover 120, the pressure-bearing block 122 is inserted into the inner wall of the upper opening of the upper shell 1 in a matching manner, and the inner wall of the outer cover 120 is sleeved on the outer wall of the upper opening of the upper shell 1 in a; be provided with elastomeric element 124 in buffer cavity 123, pass through between the top of bearing block 122 and the internal wall top of enclosing cover 120 elastomeric element 124 connects, and this elastomeric element 124 is damping spring, and at vibration and centrifugal rotation in-process, avoided the slurry in cube container 100 to lose to spill the outside, and bearing block 122 can beat concrete slurry in the up-and-down cushioning motion process, makes concrete slurry that permeates water more closely to the effort that produces when the on-the-spot concrete surface of certain degree simulation vibrates, thereby makes indoor test and actual vibration more be close.
In the present invention, as shown in fig. 2, 3 and 4, a supporting step 10a is provided on the inner wall of the upper opening of the lower casing 3 and the inner wall of the upper opening of the middle casing 2, an inserting portion 10b that contracts into the inside of the casing is provided on the lower opening of the middle casing 2 and the lower opening of the upper casing 1, the inserting portion of the lower opening of the middle casing 2 is inserted into the supporting step of the upper opening of the lower casing 3, and the inserting portion 10b of the lower opening of the upper casing 1 is inserted into the supporting step 10a of the upper opening of the middle casing 2; fixed in the installation go up casing 1, well casing 2 and lower casing 3 during, insert through supporting step 10a and inserting portion 10b between the adjacent casing and close, make behind every adjacent shells inner wall and the mutual parallel and level of outside, to having formed fine limiting displacement between the adjacent casing, when using bolt 102 to go up casing 1, well casing 2 and the engaging lug 101 of the outer wall all around of casing 3 to fix, thereby prevent to misplace between the adjacent casing, reduced thick liquids and leaked outside the junction of adjacent casing when stirring concrete thick liquids.
The utility model discloses in, utilize the concrete slurry homogeneity evaluation test device that permeates water to implement the process of slurry homogeneity evaluation as follows:
(1) and preparing a pervious concrete slurry sample:
mixing 10-20mm of aggregate, P.O 42.5.5 cement, tap water and a polycarboxylic acid water reducing agent according to the mixing proportion shown in the table 1; taking the uniformity evaluation test device manufactured in the step (one) as a test die, firstly, filling the freshly-mixed pervious concrete slurry into a cubic container 100 formed by an upper shell 1, a middle shell 2 and a lower shell 3 in two layers, and uniformly inserting and tamping for 10-20 times from the edge to the center of the cubic container 100 in the filling process of each layer by using a stirring rod;
table 1 see through: water concrete mixing proportion
(2) Weighing and calculating the mass of the pervious concrete slurry
After the concrete slurry is uniformly inserted and tamped, a test mould (the cubic container 100) filled with newly-mixed pervious concrete slurry is placed on a vibrating table 11, the container cover body 12 is covered and fastened on the outer wall of the test mould (the cubic container 100), so that a pressure-bearing block body 122 is contacted with the concrete slurry, the vibrating table 11 is started to vibrate to make the pervious concrete slurry compact, the vibration time lasts 180s, the container cover body 12 is taken down and the surface of the container cover body is leveled, a rotating table 13 can be started to drive the cubic container 100 to rotate centrifugally in the vibration process of the vibrating table 11, the container cover body 12 can be buckled on the outer wall of the test mould (the cubic container 100), the pressure-bearing block body 122 is contacted with the concrete slurry to vibrate and rotate centrifugally, so that the pervious concrete slurry is more compact, the container cover body 12 is removed after the vibration is finished, before the pervious concrete slurry is initially solidified, the bolts 102 assembled on the outer walls of the upper shell 1, the middle shell 2 and the lower shell 3 of the test mold are sequentially detached, when one shell is detached, pervious concrete slurry generated in the upper shell 1, the middle shell 2 and the lower shell 3 is respectively and correspondingly excised, the quality of the pervious concrete slurry generated in the upper shell 1, the middle shell 2 and the lower shell 3 is respectively weighed, and the quality of the pervious concrete slurry generated in the upper shell 1, the middle shell 2 and the lower shell 3 is respectively recorded as M1、M2And M3；
(3) Weighing and calculating the mass of the aggregate and the surface area thereof: before the pervious concrete slurry is initially set, washing and screening the weighed pervious concrete slurry to obtain aggregate and/or sand of the relatively clean pervious concrete slurry, and washing the aggregate to ensure that the surface of the aggregate cannot be wrapped by the slurry; then screening by using various levels of sieve pores with the aggregate nominal grain diameter of 2.36-19.5 mm, wherein the size of the screened sieve pores is 0.15-2.36 mm; the screened mesh size is related to the composition characteristics of the pervious concrete, and when the pervious concrete is evaluated to contain a certain amount of sand, the minimum mesh size is0.15mm, when the pervious concrete is evaluated to be free of sand, the minimum sieve pore size is 2.36mm, and the nominal maximum particle size of the used aggregate is less than 19.5 mm; the dry mass of the saturated surface of the aggregate and/or the sand contained in the pervious concrete slurry and the corresponding surface area are correspondingly weighed again, and after statistics, weighing and calculation, the dry mass of the saturated surface of the aggregate and/or the sand contained in the pervious concrete slurry of the upper shell 1, the middle shell 2 and the lower shell 3 is finally obtained, wherein the dry mass of the saturated surface of the aggregate and/or the sand contained in the pervious concrete slurry is W1、W2And W3The aggregate surface areas of the pervious concrete slurry are respectively S1、S2And S3So as to evaluate the uniformity of the pervious concrete through the quality of the pervious concrete slurry.
(4) Calculating the slurry uniformity of the pervious concrete
Respectively recording the mass M of the pervious concrete slurry generated in the upper shell 1, the middle shell 2 and the lower shell 3 in the step (2)1、M2And M3And the dry mass of the saturated surfaces of the aggregates and/or sand contained in the pervious concrete slurry of the upper shell 1, the middle shell 2 and the lower shell 3 in the step (3) is W respectively1、W2And W3Surface area is S1、S2And S3And the calculation of the uniformity of the pervious concrete slurry meets the following requirements:
and the total uniformity U of the pervious concrete slurry meets the sum of the uniformity of each pervious concrete slurry, namely the total uniformity U meets the following requirements: u is equal to U1+U2+U3The smaller the overall uniformity U, the more permeable the concreteThe better the uniformity of the slurry of the soil. The obtained numerical values of the quality of the pervious concrete, the quality of the aggregate and the surface area of the aggregate are substituted into a formula through the simulation experiment, and the total uniformity U of the pervious concrete can be calculated to be 0.82.
Example 2
In this example, the vibration time of the vibration table 11 is 120s, the other technical features are the same as those of example 1, and the overall uniformity U of the pervious concrete is calculated to be 0.54.
Example 3: validation of Strength and Water permeability
Pervious concrete samples were prepared according to the vibration parameters and vibration modes used in example 1, and were subjected to 7d compressive strength and water permeability coefficient tests, respectively, with the test results shown in table 2.
Table 2 see through: strength and water permeability of pervious concrete slurry
| Example numbering | 7d compressive Strength (MPa) | Coefficient of water permeability (mm/s) |
| Example 1 | 5.4 | 2.35 |
| Example 2 | 8.2 | 4.11 |
As is clear from Table 2, the strength and water permeability of example 1 are inferior to those of example 2; according to the calculation result of the overall uniformity, the uniformity U calculated in example 1 is 0.82; the uniformity U calculated in example 2 was 0.54, which indicates that the uniformity in example 2 is better than that in example 1. The vibration time of 180s in the embodiment 1 is too long, so that the uniformity of the pervious concrete slurry in the test piece is poor, while the vibration time of the embodiment 2 is proper, and the slurry uniformity is good. Therefore, the utility model provides a pervious concrete thick liquids homogeneity evaluation is effective feasible, can scientific, accurate, ration, evaluate the distribution homogeneity of the different positions slurry of material fast to realized its mechanical properties and the coordination of the function of permeating water.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a concrete slurry uniformity test device permeates water which characterized in that: the testing device comprises a base, a vibrating table and a cubic container with a closed bottom end and an open upper end, wherein the vibrating table is fixed on the base, and the cubic container is arranged on the vibrating table; the cube container is vertical upper casing, well casing and the lower casing that assembles the connection and constitutes from top to bottom, the bottom of casing is sealed down, the upper end opening go up the outer wall all around of casing, the outer wall all around of well casing and the outer wall all around of casing down and be provided with the engaging lug respectively, go up between adjacent outer wall of casing and well casing between and the outer wall of well casing between adjacent and the outer wall of well casing and the outer wall of casing down pass through engaging lug and bolt interconnect respectively.
2. The pervious concrete slurry uniformity testing device of claim 1, characterized in that: the upper end opening of the lower shell and the inner wall of the upper end opening of the middle shell are provided with supporting steps, inserting parts which contract towards the inside of the shell are respectively arranged at the lower end opening of the middle shell and the lower end opening of the upper shell, the inserting parts at the lower end opening of the middle shell are inserted into the supporting steps at the upper end opening of the lower shell, and the inserting parts at the lower end opening of the upper shell are inserted into the supporting steps at the upper end opening of the middle shell.
3. The pervious concrete slurry uniformity testing device of claim 2, characterized in that: the outer wall of the upper end opening part of the lower shell and the outer wall of the lower end opening part of the middle shell as well as the outer wall of the upper end opening part of the middle shell and the outer wall of the lower end opening part of the upper shell are connected with each other through connecting lugs and bolts.
4. The pervious concrete slurry uniformity testing device of claim 3, characterized in that: the inner length and the inner width of the upper shell, the middle shell and the lower shell are 150 mm-180 mm; the heights of the upper shell, the middle shell and the lower shell are all 50-80 mm; the thickness of the upper shell, the middle shell and the lower shell is not less than 5 mm.
5. The pervious concrete slurry uniformity testing device of claim 2 or 3, characterized in that: and a container cover body is arranged at the upper opening part of the upper shell, and the outer wall of the container cover body is connected with the outer wall of the upper shell through a buckle.
6. The pervious concrete slurry uniformity testing device of claim 5, characterized in that: the container cover body comprises an outer cover body, an annular supporting table arranged on the inner wall of the outer cover body and a pressure-bearing block body arranged between the top end of the inner wall of the outer cover body and the annular supporting table in a sliding mode, a buffer cavity is formed between the top end of the pressure-bearing block body and the top end of the inner wall of the outer cover body, the pressure-bearing block body is inserted into the inner wall of the upper opening of the upper shell in a matching mode, and the inner wall of the outer cover body is sleeved on the outer wall of.
7. The pervious concrete slurry uniformity testing device of claim 6, characterized in that: an elastic component is arranged in the buffer cavity, and the top of the pressure-bearing block body is connected with the top end of the inner wall of the outer cover body 120 through the elastic component.
8. The pervious concrete slurry uniformity testing device of claim 1, characterized in that: the base is provided with a rotating table, and the vibrating table is fixed on the base through the rotating table.
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| CN111751181A (en) * | 2020-06-28 | 2020-10-09 | 广西交科集团有限公司 | Pervious concrete slurry uniformity evaluation model and evaluation method |
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