CN110595849B - Concrete filling method capable of reducing discreteness of concrete test block - Google Patents
Concrete filling method capable of reducing discreteness of concrete test block Download PDFInfo
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- CN110595849B CN110595849B CN201910030371.7A CN201910030371A CN110595849B CN 110595849 B CN110595849 B CN 110595849B CN 201910030371 A CN201910030371 A CN 201910030371A CN 110595849 B CN110595849 B CN 110595849B
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Abstract
The invention discloses a concrete filling method in the process of manufacturing a concrete test block, which comprises the following steps: the concrete mixture that will mix evenly is at the in-process of packing into the examination mould frame, makes the concrete mixture of each shovel splendid attire divide into 2 parts or more than 2 parts equally, corresponds to pack into 2 or more than 2 examination mould frames, until filling to the concrete mixture natural overflow. In the process of testing the compressive strength of concrete, the concrete filling method is applied to the manufacturing process of concrete test blocks and is combined with the standard of a common concrete mechanical property test method for use, so that the consistency of concrete filling in each test mould frame in each group of test pieces is improved, the discreteness of the concrete test blocks (compressive strength) can be reduced remarkably, the strength representative value of the concrete test blocks is more accurate, the actual performance index of the concrete can be reflected more accurately, the invalid times of the test results are reduced, and the test efficiency is improved.
Description
Technical Field
The invention relates to a concrete compressive strength testing technology, in particular to a concrete filling method in a concrete test block manufacturing process.
Background
The compression strength of the concrete is tested through experiments, and the latest national standard (GB/T50081-2002) needs to adopt a cubic test piece with the side length of 150mm as a standard size test piece of the compression strength of the concrete for the concrete with the strength grade below C60. According to the standard GB/T50081-2002 of common concrete mechanical property test method, a cube with the side length of 150mm is manufactured and maintained, and the ultimate compressive strength measured by a standard test method is called as the compressive strength of the concrete standard cube. In actual engineering practice, the compressive strength value of concrete is represented by the compressive strength of a group (3 blocks) of concrete test blocks, and the determination of the concrete strength representative value is specified according to GB50107-2010 concrete strength test evaluation standard, and the following specifications are met:
1. when the difference between the maximum value and the minimum value of the strength (test value) in a group of test pieces and the intermediate value does not exceed 15% of the intermediate value, the arithmetic mean value of the strengths of 3 test pieces is taken as the representative value of the compressive strength of the group of test pieces.
2. And when the difference between the maximum value or the minimum value of the strength and the middle value in a group of test pieces is higher than 15% of the middle value, taking the middle value as the representative value of the compressive strength of the group of test pieces.
3. When the difference between the maximum value and the minimum value of the strength and the median value in a group of test pieces exceeds 15 percent of the median value, the strength of the group of test pieces is not used as the basis for evaluation, and the group of compression strength tests is invalid.
In fact, there is a deviation in the 3 strength values of a set of concrete test blocks, and this deviation is the discreteness of the concrete test blocks. According to the method for determining the compressive strength representative value of the concrete test block, the discreteness of the concrete test block has a decisive influence on the determination of the compressive strength representative value of the concrete test block. The concrete filling method in the test block manufacturing process which has a great relation with the test block discreteness has no clear regulation and description, so that the uniformity of the concrete mixture which is originally mixed uniformly is poor after the concrete mixture is filled into the concrete test mold frame, and the discreteness of the concrete test block is larger. The mould for manufacturing the concrete sample is called a test mould frame.
In fact, in practical engineering practice, the filling method of the concrete test block manufacturing process is the biggest factor that affects the discreteness of the concrete test block and is recognized by the people in the industry. Therefore, the method for filling the concrete test block in the manufacturing process is improved, the consistency of concrete filling in each test mould frame in each group of test pieces is improved, and the method is a key step for reducing the discreteness of the test block, obtaining a more accurate compressive strength representative value and improving the testing efficiency.
Disclosure of Invention
< object of the invention >
In order to obtain a more accurate concrete block strength representative value, improve the testing efficiency and reduce the times of invalid testing, the invention provides a concrete filling method in the concrete block manufacturing process.
< main aspects of the invention >
The invention relates to a concrete filling method capable of reducing the discreteness of a concrete test block, which comprises the following steps: the concrete mixture that will mix evenly is at the in-process of packing into the examination mould frame, makes the concrete mixture of each shovel splendid attire divide into 2 parts or more than 2 parts equally, corresponds to pack into 2 or more than 2 examination mould frames, until filling to the concrete mixture natural overflow.
Therefore, the filling uniformity of the concrete mixture in each test mould frame is kept consistent to the maximum extent.
As a preferred embodiment of the present invention, wherein:
the number of the test mold frames is 2, the 2 test mold frames are arranged side by side and are aligned with one side wall, and during filling, concrete mixture filled in each shovel is filled from the middle point of the aligned side walls until the concrete mixture is filled to naturally overflow; or
The quantity of examination mould frame contains 2, 2 examination mould frame arrange side by side just 2 examination mould frame sharing a lateral wall, during filling, make the concrete mixture of each shovel splendid attire follow the mid point position of sharing the lateral wall is packed into, overflows naturally until filling to the concrete mixture.
As a preferred embodiment of the present invention, wherein:
the number of the test mold frames is 4, the 4 test mold frames are arranged in a Chinese character 'tian', the 4 test mold frames are respectively abutted by a vertex angle, and during filling, concrete mixture filled in each shovel is filled from the position of the abutted vertex angle until the concrete mixture is filled until the concrete mixture naturally overflows; or
The quantity of examination mould frame contains 4, 4 examination mould frames are the field word and arrange, just 4 examination mould frames sharing a apex angle, during filling, make the concrete mixture of each shovel splendid attire follow the apex angle position of sharing is packed into, overflows naturally until filling to the concrete mixture.
As a preferred embodiment of the present invention, wherein:
the number of the test mold frames comprises 6 or more than 6, and the test mold frames are filled according to the following sequence:
s1, arranging the test mould frames in order in the two-dimensional direction;
s2, taking the position of the top angle where any 4 test mold frames abut or share as a first loading point, and loading the concrete mixture loaded by each shovel from the first loading point;
and S3, taking any 2 test mold frames as second loading points, and loading the concrete mixture loaded by each shovel from the second loading points until all the test mold frames are loaded until the concrete mixture naturally overflows.
In a preferred embodiment of the present invention, the method further comprises step S4 of vibrating and curing the concrete mixture in the filled test mold frame.
As a preferred embodiment of the present invention, wherein: in step S1, the alignment in the two-dimensional direction is: and arranging the test mold frames in a multi-row and multi-column mode, and enabling the number of the test mold frames in each row to be equal and the number of the test mold frames in each column to be equal as much as possible. For example, if there are 8 test mold frames in total, 4 test mold frames in each row can be arranged in two rows instead of 5 test mold frames in each row and 3 test mold frames in each row; for another example, if there are 9 trial mold frames in total, 3 trial mold frames per line may be arranged in 3 lines instead of three lines of 4:4: 1.
As a preferred embodiment of the present invention, wherein: the weight of concrete mixture contained by each shovel is equal.
As a preferred embodiment of the present invention, wherein: and a shovel with standard volume is adopted to contain the concrete mixture for filling in each operation.
Preferably, the test mold frames of the same batch are filled by the same trained and professional personnel, so that the discreteness of the test block caused by human factors is reduced.
It should be noted that the present invention is generally directed to all containers or tools for holding concrete mixtures.
< technical effects of the invention >
According to the concrete filling method, concrete mixture contained by one shovel can be uniformly and equally dispersed into a plurality of adjacent test mold frames each time, so that concrete samples contained in the test mold frames have high consistency, and then the concrete samples are vibrated and maintained according to a standard specified method to prepare test pieces, thereby reducing the deviation among the compression strength test values of 3 test blocks in each group, reducing the discreteness of the concrete test blocks, enabling the strength representative value of the concrete test blocks to be more accurate, and improving the test efficiency.
The invention provides a clear and operable method for manufacturing the concrete test block, makes up the defects in the existing standard specification, and ensures that the discreteness of the compressive strength of the concrete test block is smaller. Therefore, the invention is actually a beneficial supplement to the standard of the test method of the mechanical property of the common concrete.
Drawings
FIG. 1 is a schematic view of the filling method of example 1 of the present invention.
FIG. 2 is a schematic illustration of the filling method of example 2 of the present invention.
FIG. 3 is a schematic view of a filling method according to example 3 of the present invention.
FIG. 4 is a schematic illustration of the filling method of example 4 of the present invention.
Detailed Description
The present invention is described in further detail below to enable those skilled in the art to practice the invention with reference to the description.
In order to make the technical effects of the present invention more clear, the following description is made with reference to specific examples:
example 1
The embodiment relates to a concrete filling method capable of reducing the discreteness of a concrete test block, which comprises the following steps:
as shown in FIG. 1, there are 3 test mold frames 10, all of which are used for filling concrete mixture to make 3 test blocks for testing the compressive strength of concrete. The 3 test blocks are used as a group.
As shown in fig. 1, 3 test mold frames 10 are first arranged in a row, and two adjacent test mold frames 10 share one sidewall 11, and as shown in fig. 1, there are 2 such sidewalls 11. In this embodiment, when filling the 3 test mold frames 10, a shovel (which is generally referred to as all containers or tools for holding concrete mixture in the present invention) is used to pour the concrete mixture, which has been uniformly mixed back and forth according to the standard method, into the test mold frame 10 from the position of the midpoint 101 (marked by a dashed square in the figure) of the sidewall 11, so that the concrete mixture held by each shovel equally flows into two adjacent test mold frames 10, until all the test mold frames 10 are filled, the excess concrete mixture naturally overflows. And then vibrating and maintaining according to the instructions in the current standard specification to prepare a group of test pieces consisting of 3 test blocks. Preferably, each of the shovels contains equal weight of concrete mix. Preferably, the test mold frames of the same batch are filled by the same trained and professional personnel, so that the discreteness of the test block caused by human factors is reduced.
Wherein it is possible that each of the test mold frames 10 has an independent side wall (not a relationship of a common side wall). When arranged in the same manner as described above, the two adjacent test mold frames 10 do not have the common side wall 11, but are aligned with each other. At this time, when filling concrete mixture, the position of the midpoint of the parallel side walls is used as a filling point, so that the concrete mixture filled in each shovel flows into two adjacent trial mold frames 10 in equal parts from the filling point, and the redundant concrete mixture naturally overflows after all the trial mold frames 10 are filled.
Wherein, the 3 test mold frames 10 can also be arranged in an L shape.
Example 2
The embodiment relates to a concrete filling method capable of reducing the discreteness of a concrete test block, which comprises the following steps:
as shown in FIG. 2, there are 4 test mold frames 20, which are used to fill concrete mixture to make 4 test blocks for testing the compressive strength of concrete.
As shown in fig. 2, the 4 test pattern frames 20 are first arranged in a grid, and the 4 test pattern frames 20 share a vertex a (indicated by a dashed circle in the figure).
In this embodiment, when filling the 4 test mold frames 20, a shovel (which is generally referred to as all containers or tools for holding concrete mixture in the present invention) is used to mix the uniform concrete mixture back and forth according to the standard method, and the top point a is used as a filling point, so that the concrete mixture held by each shovel dispersedly flows into the adjacent 4 test mold frames 20 from the point a until the excess concrete mixture naturally overflows after all the test mold frames 20 are filled. And then vibrating and maintaining according to the instructions in the current standard specification to prepare a group of test pieces consisting of 4 test blocks. Preferably, each of the shovels contains equal weight of concrete mix. Preferably, the test mold frames of the same batch are filled by the same trained and professional personnel, so that the discreteness of the test block caused by human factors is reduced.
Wherein it is possible that each of the test mold frames 20 abuts at a vertex angle, not in common. And during filling, the positions of the abutted vertex angles are used as the filling points of concrete mixtures, so that the concrete mixtures filled in each shovel are poured from the filling points, the concrete mixtures equally flow into the four adjacent test mold frames 20, and the redundant concrete mixtures naturally overflow after all the test mold frames 20 are filled.
Example 3
The embodiment relates to a concrete filling method capable of reducing the discreteness of a concrete test block, which comprises the following steps: as shown in fig. 3, there are 6 test mold frames 30 for filling concrete mixture to make 6 test blocks for testing compressive strength of concrete, and the 6 test blocks are used as two sets of test pieces for testing compressive strength.
As shown in fig. 3, first, 6 test mold frames 30 are arranged in 2 rows of 3 test mold frames. There are formed 2 vertices B (marked by dashed circles) respectively shared by four test pattern frames 30 and 2 sidewalls 31 respectively shared by two adjacent test pattern frames 30 as shown, each shared sidewall 31 including a midpoint location C (marked by dashed diamonds). Wherein, regard as the first loading point that concrete mix filled with B point position, the second loading point that concrete mix filled is regarded as to C point position.
In this embodiment, when filling the 6 test mold frames 30, a shovel (which is generally referred to as all containers or tools for holding concrete mixture in the present invention) is used to mix the concrete mixture that has been uniformly mixed back and forth according to the standard method, and point B is used as a filling point, and when two test mold frames 30 located at the middle position are filled, point C shown in fig. 3 is used as a filling point until the test mold frames 30 located at both sides are filled.
And then vibrating and maintaining according to the instructions in the current standard specification to obtain a group of test pieces consisting of 6 test blocks. Preferably, each of the shovels contains equal weight of concrete mix. Preferably, the test mold frames of the same batch are filled by the same trained and professional personnel, so that the discreteness of the test block caused by human factors is reduced.
Example 4
The embodiment relates to a concrete filling method capable of reducing the discreteness of a concrete test block, which comprises the following steps:
as shown in fig. 4, there are 9 test mold frames 40 for filling concrete mixture to make 9 test blocks for testing compressive strength of concrete, and the 9 test blocks are used as three sets of test pieces for testing compressive strength.
As shown in fig. 4, first, 9 test mold frames 40 are arranged in 3 rows. 4 vertices D (dashed circles) respectively shared by four test pattern frames 40 and 4 sidewalls 41 respectively shared by two adjacent test pattern frames 40 are formed as shown, and each shared sidewall 41 includes a midpoint position E (dashed rectangle). Wherein, regard as the first loading point that concrete mix filled with D point position, the second loading point that concrete mix filled is regarded as to E point position.
In this embodiment, when filling the 9 test mold frames 40, a shovel (which is generally referred to as all containers or tools for holding concrete mixture in the present invention) is used to mix the concrete mixture that has been uniformly mixed back and forth according to the standard method, and point D is used as the filling point, and when two test mold frames 40 located at the middle position are filled, point E shown in fig. 4 is used as the filling point until the test mold frames 40 located at both sides are filled.
And then vibrating and maintaining according to the instructions in the current standard specification to obtain a group of test pieces consisting of 9 test blocks. Preferably, each of the shovels contains equal weight of concrete mix. Preferably, the test mold frames of the same batch are filled by the same trained and professional personnel, so that the discreteness of the test block caused by human factors is reduced.
In the process of testing the compressive strength of concrete, the concrete filling method is applied to the manufacturing process of concrete test blocks and is combined with the standard of a common concrete mechanical property test method for use, so that the consistency of concrete filling in each test mould frame in each group of test pieces is improved, the discreteness of the concrete test blocks (compressive strength) can be reduced remarkably, the strength representative value of the concrete test blocks is more accurate, the actual performance index of the concrete can be reflected more accurately, the invalid times of the test results are reduced, and the test efficiency is improved.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of adaptation of the invention, and further modifications may be readily effected by those skilled in the art, so that the invention is not limited to the specific details and examples shown and described herein, without departing from the general concept defined by the claims and the scope of equivalents.
Claims (5)
1. A concrete filling method capable of reducing the discreteness of concrete test blocks is characterized in that the following filling methods are adopted according to the number of test mold frames:
when the number of the test mold frames is 2, the 2 test mold frames are arranged side by side and the 2 test mold frames are respectively aligned with one side wall; during filling, the concrete mixture contained by each shovel is filled from the midpoint position of the parallel side walls until the concrete mixture is filled to naturally overflow; or the 2 test mold frames are arranged side by side and share one side wall; during filling, the concrete mixture contained by each shovel is filled from the midpoint position of the common side wall until the concrete mixture naturally overflows after filling;
when the number of the test mold frames is 4, the 4 test mold frames are arranged in a field shape, and the 4 test mold frames are respectively abutted by a vertex angle; during filling, the concrete mixture contained by each shovel is filled from the position of the abutted vertex angle until the concrete mixture is filled to naturally overflow; or the 4 test mold frames are arranged in a shape like a Chinese character 'tian', and the 4 test mold frames share a vertex angle; during filling, the concrete mixture contained by each shovel is filled from the position of the common vertex angle until the concrete mixture naturally overflows after filling;
when the number of the test mold frames is more than 6, the filling is carried out according to the following sequence:
s1, arranging the test mould frames in order in the two-dimensional direction;
s2, taking the position of the top angle where any 4 test mold frames abut or share as a first loading point, and loading the concrete mixture loaded by each shovel from the first loading point;
and S3, taking any 2 test mold frames as second loading points, and loading the concrete mixture loaded by each shovel from the second loading points until all the test mold frames are loaded until the concrete mixture naturally overflows.
2. The concrete filling method according to claim 1, further comprising a step S4 of vibrating and curing the concrete mixture in the filled test mold frame.
3. The concrete filling method according to claim 1, wherein in step S1, the alignment in the two-dimensional direction is: and arranging the test mold frames in a multi-row and multi-column mode, and enabling the number of the test mold frames in each row to be equal and the number of the test mold frames in each column to be equal as much as possible.
4. A concrete charging method as claimed in any one of claims 1 to 3, wherein each shovel contains equal amounts of concrete mix by weight.
5. The concrete filling method of claim 4, wherein each operation is performed using a standard volume shovel containing concrete mix.
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