CN107817275B - Concrete segregation detection device and method - Google Patents
Concrete segregation detection device and method Download PDFInfo
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- CN107817275B CN107817275B CN201710793422.2A CN201710793422A CN107817275B CN 107817275 B CN107817275 B CN 107817275B CN 201710793422 A CN201710793422 A CN 201710793422A CN 107817275 B CN107817275 B CN 107817275B
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- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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Abstract
The invention provides a concrete segregation detection device and a method, wherein the concrete segregation detection device comprises an insulating barrel body, a resistance meter and an air compressor, wherein a plurality of positive electrode connectors and negative electrode connectors are respectively arranged on two opposite sides of the side wall of the barrel body from bottom to top, the positive electrode connectors and the negative electrode connectors are respectively and electrically connected with the resistance meter, a barrel cover is detachably connected to the upper end of the barrel body, the barrel cover is connected with the air compressor through an air guide pipe, and the air guide pipe is provided with a pressure gauge. The invention has the beneficial effects that: the concrete segregation environment in the pumping process can be truly reduced, and the components at different heights of the segregated concrete can be accurately detected.
Description
Technical Field
The invention relates to the technical field of concrete segregation detection, in particular to a concrete segregation detection device and method.
Background
The pumping concrete has the advantages of high construction speed, good quality, manpower saving, convenient construction and the like, thereby being widely applied to the projects of general building structure concrete, road concrete, mass concrete, high-rise buildings and the like. However, during the pumping process, the pipeline is often blocked due to unreasonable proportioning or improper construction. Among them, concrete segregation is an important cause of blocking of a pumping pipeline, and the segregation concrete affects the final strength of the concrete, causing poor construction quality.
Chinese patent publication No. CN102749439B discloses a fresh concrete segregation phenomenon testing and evaluating device, which comprises a vibration component and a test component, wherein the vibration component comprises a base, and a counterweight chamber is arranged on the base; an engine room is fixed at the upper end of the counterweight room, and an engine is arranged in the engine room; the upper part of the engine room is provided with a vibration table connected with the engine; the test part is fixed on the vibration table; the test part comprises an upper material containing chamber and a lower material containing chamber which are communicated up and down, a disc is arranged between the lower material containing chamber and the upper material containing chamber, and the upper material containing chamber is connected with the lower material containing chamber through a rotating shaft; the round hole is arranged on the disc. The device can test and evaluate the segregation condition of fresh concrete, but cannot simulate the concrete segregation environment in the pumping process and cannot detect the components at different heights of the segregated concrete.
Disclosure of Invention
The invention aims to provide a concrete segregation detection device and a concrete segregation detection method, and solves the technical problems that the concrete segregation environment in the pumping process cannot be simulated at present, and components at different heights of the segregated concrete cannot be detected.
The invention provides a concrete segregation detection device which comprises an insulating barrel body, a resistance meter and an air compressor, wherein a plurality of positive electrode connectors and negative electrode connectors are respectively arranged on two opposite sides of the side wall of the barrel body from bottom to top, the positive electrode connectors and the negative electrode connectors are respectively and electrically connected with the resistance meter, the upper end of the barrel body is detachably connected with a barrel cover, the barrel cover is connected with the air compressor through an air guide pipe, and the air guide pipe is provided with the pressure meter.
Further, the upper end of the barrel body is connected with the barrel cover through a bolt.
Furthermore, a through hole is formed in the barrel cover, an inner nut is arranged at the position of the through hole, an external thread is arranged at one end of the air duct, and one end of the air duct is in threaded connection with the inner nut.
The invention also provides a concrete segregation detection method, which applies the concrete segregation detection device and comprises the following steps:
respectively preparing slurry of each component according to the same water-cement ratio, wherein the slurry comprises cement paste, mortar, gravel slurry with different particle size grades and concrete;
step two, pouring water and the component slurry in the step one into the barrel body independently, covering a barrel cover on the barrel body, starting an air compressor, determining a certain set pressure in the barrel body through a pressure gauge, connecting a positive electrode joint and a negative electrode joint on the barrel body through a resistance meter, and measuring the resistivity of the water and the component slurry respectively;
pouring concrete into the barrel body, covering the barrel body with a barrel cover, starting an air compressor, determining a certain set pressure in the barrel body through a pressure gauge, connecting a resistance meter with a plurality of pairs of positive electrode connectors and negative electrode connectors on the barrel body from bottom to top, and measuring the resistivity of the concrete at different heights;
and step four, comparing the resistivity of the concrete at different heights in the step three with the resistivity of the water and the slurry of each component in the step two, and determining component intervals of the concrete at different heights in the barrel body so as to determine the segregation degree of the concrete.
Further, in the step one, the wet screening method is adopted to screen out cement paste, mortar, gravel paste with different particle size grades and concrete from the concrete through screens with different apertures.
Furthermore, in the second step, the height of the water and the slurry of each component in the barrel body exceeds a pair of positive electrode joints and negative electrode joints at the lowest end of the side wall of the barrel body.
Further, in the second step, the ohmmeter is connected with a plurality of pairs of positive electrode joints and negative electrode joints on the barrel body so as to respectively measure the resistivity of the water and the slurry containing each component for a plurality of times.
Further, in the third step, the height of the concrete in the barrel body exceeds a pair of positive electrode joints and negative electrode joints at the uppermost end of the side wall of the barrel body.
Compared with the prior art, the concrete segregation detection device and the method have the following characteristics and advantages:
the concrete segregation detection device has the advantages of simple structure and lower cost, can truly reduce the concrete segregation environment in the pumping process, and accurately detect the components at different heights of the segregated concrete.
The concrete segregation detection method provided by the invention is simple in test operation, can truly reduce the concrete segregation environment in the pumping process, and accurately detects the components at different heights of the segregated concrete, so that the reasonable proportion of the concrete is optimized, and the construction quality of the pumped concrete is improved.
The features and advantages of the present invention will become more apparent from the detailed description of the invention when taken in conjunction with the drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a concrete segregation detection apparatus according to an embodiment of the present invention;
the device comprises a barrel cover 1, a barrel cover 2, a barrel body 3, an air compressor 4, a resistance meter 5, a pressure meter 6, an internal nut 7, a bolt 8, a negative electrode joint 9, a positive electrode joint 10 and an air guide pipe.
Detailed Description
As shown in fig. 1, the present embodiment provides a concrete segregation detecting apparatus, one side of the sidewall of the insulating barrel body 2 is provided with a plurality of positive electrode tabs 9 from bottom to top, the opposite other side of the sidewall of the barrel body 2 is provided with a plurality of negative electrode tabs 8 from bottom to top, and the positive electrode tabs 9 and the negative electrode tabs 8 are at the same level. The positive electrode joint 9 and the negative electrode joint 8 are respectively and electrically connected with the resistance meter 4, and the resistance meter 4 can measure the resistivity of the material in the barrel body 2. The upper end of the barrel body 2 is connected with the barrel cover 1 through a bolt 7, so that the barrel body 2 can be detachably connected with the barrel cover 1. The barrel cover 1 is opened, and materials can be added into the barrel body 2. The barrel cover 1 is provided with a through hole, an inner nut 6 is arranged at the position of the through hole, an external thread is arranged at one end of the air duct 10, one end of the air duct 10 is in threaded connection with the inner nut 6, the other end of the air duct 10 is connected with the air compressor 3, and the air duct 10 is provided with a pressure gauge 5.
The embodiment further provides a concrete segregation detection method, and the concrete segregation detection device applying the embodiment includes the following steps:
respectively preparing slurry of each component according to the same water-cement ratio, wherein the slurry comprises cement paste, mortar (only containing sand and the cement paste), gravel slurry (only containing gravel and the mortar) with different particle size grades and concrete. Preferably, the wet screening method can be adopted to screen out cement paste, mortar, gravel paste with different particle size grades and concrete from the concrete through screens with different apertures, so that the efficiency of preparing the slurry with each component can be improved.
And step two, independently pouring water and the component slurry in the step one into the barrel body 2 respectively, wherein the water and the component slurry occupy about one third of the volume of the barrel body 2, and the height of the water and the component slurry in the barrel body 2 exceeds a pair of positive electrode connectors 9 and negative electrode connectors 8 at the lowest end of the side wall of the barrel body 2. The barrel body 2 is covered with the barrel cover 1, and the air compressor 3 is started to enable the barrel body 2 to simulate the concrete segregation environment of the pumping process. The air compressor 3 can be switched on or switched off or adjusted to a certain set pressure as required, and the pressure gauge 5 is used for determining that the pressure in the barrel body 2 is in the certain set pressure. The positive electrode joint 9 and the negative electrode joint 8 on the barrel body 2 are connected through the ohmmeter 4, and the resistivity of the water and the slurry containing the components are respectively measured. It should be noted that after each component is measured, the barrel 2 is emptied and then another component is measured. For example, after measuring the resistivity of water, the water is poured out of the barrel body 2, the barrel body 2 is cleaned, then cement slurry is poured into the barrel body 2, the resistivity of the cement slurry is measured, and the resistivity of the mortar, the gravel slurry with different particle size grades and the concrete are measured according to the principle.
Preferably, the ohmmeter 4 is connected with the multiple pairs of positive electrode joints 9 and the multiple pairs of negative electrode joints 8 on the barrel body 2, and at the moment, the height of the water and the slurry of the components in the barrel body 2 is required to exceed the multiple pairs of positive electrode joints 9 and the multiple pairs of negative electrode joints 8, so that the measured resistivity can be ensured to be more accurate through multiple measurement and verification. The measured resistivities of the water and the slurries of the components are shown in table 1.
TABLE 1 resistivity of Water and slurries of Components
And step three, pouring concrete into the barrel body 2, wherein the concrete accounts for about four fifths of the volume of the barrel body 2, and the height of the concrete in the barrel body 2 exceeds a pair of positive electrode connectors 9 and negative electrode connectors 8 at the uppermost end of the side wall of the barrel body 2. The barrel body 2 is covered with the barrel cover 1, the air compressor 3 is started, and the pressure in the barrel body 2 is determined to be a certain set pressure through the pressure gauge 5. The proportioned concrete can not be isolated, if the concrete is isolated, the stones with large particle sizes sink down during the isolation, the cement paste floats on the stones, the particles with small particle sizes are in the middle to form layering, and the components at different heights are also changed. The resistance meter 4 is connected with a plurality of pairs of positive electrode connectors 9 and negative electrode connectors 8 on the barrel body 2 from bottom to top, and the resistivity of the concrete at different heights is measured.
And step four, comparing the resistivity of the concrete at different heights in the step three with the resistivity of the water and the slurry of each component in the step two (the resistivity of the water and the slurry of each component in the table 1), wherein the resistivity of the concrete at different heights in the step three may correspond to the resistivity in the table 1 or be positioned in the resistivity interval in the table 1. And determining component intervals at different heights of the concrete in the barrel body 2 according to the comparison so as to determine the segregation degree of the concrete.
The concrete segregation detection device of this embodiment, simple structure, the cost is lower, can really reduce the concrete segregation environment of pumping process, and the component of the different height departments of concrete after the accurate detection segregation. The concrete segregation detection method is simple in test operation, can truly reduce the concrete segregation environment in the pumping process, and accurately detects the components at different heights of the segregated concrete, so that the reasonable proportion of the concrete is optimized, and the construction quality of the pumped concrete is improved.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (3)
1. A concrete segregation detection method is implemented based on a concrete segregation detection device and is characterized by comprising an insulating barrel body, a resistance meter and an air compressor, wherein a plurality of positive electrode connectors and negative electrode connectors are respectively arranged on two opposite sides of the side wall of the barrel body from bottom to top;
the method comprises the following steps:
respectively preparing slurry of each component according to the same water-cement ratio, wherein the slurry comprises cement paste, mortar, gravel slurry with different particle size grades and concrete;
step two, pouring water and the component slurry in the step one into the barrel body independently, covering a barrel cover on the barrel body, starting an air compressor, determining a certain set pressure in the barrel body through a pressure gauge, connecting a positive electrode joint and a negative electrode joint on the barrel body through a resistance meter, and measuring the resistivity of the water and the component slurry respectively;
the height of the water and the slurry of each component in the barrel body exceeds a pair of positive electrode joints and negative electrode joints at the lowest end of the side wall of the barrel body;
the ohmmeter is connected with a plurality of pairs of positive electrode connectors and negative electrode connectors on the barrel body so as to respectively measure the resistivity of the water and the slurry of each component for a plurality of times;
pouring concrete into the barrel body, covering the barrel body with a barrel cover, starting an air compressor, determining a certain set pressure in the barrel body through a pressure gauge, connecting a resistance meter with a plurality of pairs of positive electrode connectors and negative electrode connectors on the barrel body from bottom to top, and measuring the resistivity of the concrete at different heights;
the height of the concrete in the barrel body exceeds a pair of positive electrode joints and negative electrode joints at the uppermost end of the side wall of the barrel body;
step four, comparing the resistivity of the concrete at different heights in the step three with the resistivity of the water and the slurry of each component in the step two, and determining component intervals of the concrete at different heights in the barrel body so as to determine the segregation degree of the concrete;
in the first step, the wet screening method is adopted to screen out cement paste, mortar, gravel paste with different particle size grades and concrete from the concrete through screens with different apertures.
2. The concrete segregation detection method according to claim 1, characterized in that: the upper end of the barrel body is connected with the barrel cover through a bolt.
3. The concrete segregation detection method according to claim 1, characterized in that: the barrel cover is provided with a through hole, an inner nut is arranged at the position of the through hole, an external thread is arranged at one end of the air duct, and one end of the air duct is in threaded connection with the inner nut.
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| CN201710793422.2A CN107817275B (en) | 2017-09-06 | 2017-09-06 | Concrete segregation detection device and method |
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| CN201710793422.2A CN107817275B (en) | 2017-09-06 | 2017-09-06 | Concrete segregation detection device and method |
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| CN107817275B true CN107817275B (en) | 2020-05-19 |
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| CN108931626A (en) * | 2018-05-04 | 2018-12-04 | 武汉理工大学 | A kind of chutable concrete isolation rate test barrel |
| CN111537566A (en) * | 2020-04-17 | 2020-08-14 | 中天华南建设投资集团有限公司 | Concrete forming construction method based on concrete segregation degree testing device |
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| EP0777120A2 (en) * | 1995-11-30 | 1997-06-04 | Ebara Corporation | Apparatus for detecting anions in water |
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| CN104155432A (en) * | 2014-08-07 | 2014-11-19 | 福建江夏学院 | Intelligent measuring method for setting time of cement-based material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6677763B2 (en) * | 2001-05-23 | 2004-01-13 | D. J. Geisel Technology, Inc. | Material segregation, density, and moisture analyzing apparatus and method |
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| EP0777120A2 (en) * | 1995-11-30 | 1997-06-04 | Ebara Corporation | Apparatus for detecting anions in water |
| CN1512162A (en) * | 2002-12-31 | 2004-07-14 | 湖北省建筑科学研究设计院 | Method for detecting concrete permeability by solution air pressure method |
| CN102269725A (en) * | 2011-05-10 | 2011-12-07 | 交通运输部公路科学研究所 | Device and method for testing concrete pouring uniformity and compactness |
| CN102901752A (en) * | 2012-10-24 | 2013-01-30 | 中国石油化工股份有限公司 | Method and device for measuring gelling time of gel |
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