CN117907104A - Method for detecting compressive strength of masonry mortar based on mortar sheet cube test piece - Google Patents
Method for detecting compressive strength of masonry mortar based on mortar sheet cube test piece Download PDFInfo
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- CN117907104A CN117907104A CN202311853092.3A CN202311853092A CN117907104A CN 117907104 A CN117907104 A CN 117907104A CN 202311853092 A CN202311853092 A CN 202311853092A CN 117907104 A CN117907104 A CN 117907104A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 129
- 238000012360 testing method Methods 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000012669 compression test Methods 0.000 claims abstract description 5
- 238000009826 distribution Methods 0.000 claims description 4
- 238000012886 linear function Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 description 4
- 239000011449 brick Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the field of mortar compressive strength detection, in particular to a method for detecting masonry mortar compressive strength based on a mortar sheet cube test piece, which comprises the following steps: taking out the masonry horizontal mortar joint masonry mortar sheet from the masonry; manufacturing a small cube test piece through processing; and (3) performing a compression test of the small cube test piece, and estimating the compression strength of the masonry mortar according to the compression strength of the mortar of the small cube test piece. The invention is suitable for newly-built masonry structures and existing masonry structures, and can detect the compressive strength of masonry mortar.
Description
Technical Field
The invention relates to the field of mortar compressive strength detection, in particular to a method for detecting masonry mortar compressive strength based on a mortar sheet cube test piece.
Background
Mortar is a material commonly used in construction engineering, and the compressive strength is one of important indexes for measuring the quality and performance of the mortar. The compressive strength detection method of masonry engineering mortar is numerous, such as: the application range and the strength measurement curve of the method are clear in the GB/T50315 of the current national standard 'masonry engineering field detection technical standard' and the JGJ/T371 of the current standard 'non-sintered brick masonry field detection technical specification'.
The rebound method is used for carrying out proper surface treatment on mortar joints on site and is mainly used for checking the homogeneity of mortar strength; the point load method and the pressure selecting method have stricter requirements on the thickness, the length and the width of the test piece; the tube pressing method requires a large number of samples, and the on-site sampling has large damage to the wall. In addition, there is a standard test block method, which is one of the common methods for testing the compressive strength of mortar, and when the mortar is constructed by masonry, a standard cubic test block of 70.7mm×70.7mm is manufactured by using the mixed masonry mortar, and after the curing age reaches 28 days, the compressive strength of the masonry mortar can be obtained by testing the compressive strength of the standard cubic test block.
However, the standard block method is only suitable for the case of newly-built masonry structure and reserved standard cube blocks, and the standard cube blocks cannot be manufactured for the existing masonry structure and the newly-built masonry structure without reserved or missing standard cube blocks, so that the method is difficult to detect the compressive strength of masonry mortar.
Disclosure of Invention
The invention aims to provide a method for detecting the compressive strength of masonry mortar based on a mortar sheet cube test piece, which solves the problems that the compressive strength of masonry mortar with a new masonry structure and an existing masonry structure is required to be detected under the conditions of new masonry engineering and the existing masonry engineering, lack of standard cube test piece strength data or result in doubt and the like.
In order to achieve the above object, the technical scheme of the present invention is as follows: the method for detecting the compressive strength of masonry mortar based on the mortar sheet cube test piece comprises the following steps:
taking out the masonry horizontal mortar joint masonry mortar sheet from the masonry;
Manufacturing a small cube test piece through processing;
and (3) performing a compression test of the small cube test piece, and estimating the compression strength of the masonry mortar according to the compression strength of the mortar of the small cube test piece.
Further, processing and manufacturing a small cube test piece, including:
grinding the masonry horizontal mortar joint masonry mortar sheet taken out of the masonry;
Cutting the horizontal mortar joint masonry mortar sheet of the masonry according to the size of the small cube test piece;
And pasting the cut masonry horizontal mortar joint masonry mortar sheet to obtain a small cube test piece.
Further, the dimensions of the small cube test pieces were 30mm×30mm.
Further, the side dimensions of the polished and cut masonry horizontal mortar joint masonry mortar pieces are 30mm×10mm, the plane dimensions of the polished and cut masonry horizontal mortar joint masonry mortar pieces are 30mm×30mm, and the polished and cut masonry horizontal mortar joint masonry mortar pieces are pasted to obtain small cube test pieces with dimensions of 30mm×30mm×30mm.
Further, estimating the compressive strength of the masonry mortar from the mortar compressive strength of the small cube test piece, comprising:
Establishing a test strength curve of the compressive strength of the small cube test piece and the compressive strength of the standard cube through normal distribution hypothesis test and outlier test;
performing pressure test on the small cube test piece;
And according to the pressure test result of the small cube test piece, the compressive strength of the masonry mortar is estimated by combining the test curves of the compressive strength of the small cube test piece and the compressive strength of the standard cube.
Further, the type of the measured curve of the compressive strength of the small cube test piece and the compressive strength of the standard cube is a linear function, and the fitting formula is as follows:
y＝1.8307x-0.7103
wherein y is the compressive strength of a standard cube, x is the compressive strength of a small cube test piece, and the obtained correlation index R 2 = 0.8912.
Further, the type of the measured curve of the compressive strength of the small cube test piece and the compressive strength of the standard cube is a logarithmic function, and the fitting formula is as follows:
y＝8.7294ln(x)-4.7019
Wherein y is the compressive strength of a standard cube, x is the compressive strength of a small cube test piece, and the obtained correlation index R 2 = 0.9671.
Further, the type of a measured curve of the compressive strength of the small cube test piece and the compressive strength of the standard cube is a polynomial function, and the fitting formula is as follows:
y＝-0.4369x2+6.3351x-10.225
Wherein y is the compressive strength of a standard cube, x is the compressive strength of a small cube test piece, and the obtained correlation index R 2 = 0.9886.
The adoption of the scheme has the following beneficial effects:
The invention provides a novel masonry engineering field detection method, which comprises the steps of taking out a masonry horizontal mortar joint masonry mortar sheet from a masonry, processing the masonry horizontal mortar joint masonry mortar sheet into a small cube test piece, performing a compression test of the small cube test piece, and estimating the compression strength of the masonry mortar according to the mortar compression strength of the small cube test piece; compared with a standard test block method, the method can be suitable for detecting the compressive strength of masonry mortar of a newly-built masonry structure and an existing masonry structure.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention;
FIG. 2 shows a side of a polished and cut mortar sheet according to an embodiment of the invention;
FIG. 3 is a plan view of a polished and cut mortar sheet according to an embodiment of the invention;
Fig. 4 is a schematic side view of a small mortar cube after the bonding according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following is a further detailed description of the embodiments:
an embodiment is shown in fig. 1: the method for detecting the compressive strength of masonry mortar based on the mortar sheet cube test piece comprises the following steps:
s1: and taking out the masonry horizontal mortar joint masonry mortar sheet from the masonry.
Specifically, the masonry is a structural material formed by masonry blocks such as bricks, stones or building blocks and mortar or other cementing materials according to a certain set of masonry process, horizontal mortar joints are masonry mortar in the horizontal direction of the masonry, and are mortar layers between the upper layer and the lower layer of the blocks, bonding mortar layers are arranged between the blocks so that the blocks form integral joint work, the compressive strength of masonry mortar sheets between the upper layer and the lower layer of the blocks is an important parameter for measuring the strength of the masonry, and detecting the compressive strength of the masonry mortar is an important work for evaluating the strength of the masonry.
S2: and manufacturing a small cube test piece through processing.
Specifically, processing and manufacturing a small cube test piece, including: grinding the masonry horizontal mortar joint masonry mortar sheet taken out of the masonry; cutting the horizontal mortar joint masonry mortar sheet of the masonry according to the size of the small cube test piece; and pasting the cut masonry horizontal mortar joint masonry mortar sheet to obtain a small cube test piece.
Taking a small cube test piece with the size of 30mm multiplied by 30mm as an example, the side size of the polished and cut masonry horizontal mortar joint masonry mortar piece is 30mm multiplied by 10mm, the plane size of the polished and cut masonry horizontal mortar joint masonry mortar piece is 30mm multiplied by 30mm, and the small cube test piece with the size of 30mm multiplied by 30mm is obtained by pasting three polished and cut masonry horizontal mortar joint masonry mortar pieces.
S3: and (3) performing a compression test of the small cube test piece, and estimating the compression strength of the masonry mortar according to the compression strength of the mortar of the small cube test piece.
Specifically, the compressive strength of the masonry mortar is estimated from the mortar compressive strength of the small cube test piece, including: establishing a test strength curve of the compressive strength of the small cube test piece and the compressive strength of the standard cube through normal distribution hypothesis test and outlier test; performing pressure test on the small cube test piece; and according to the pressure test result of the small cube test piece, the compressive strength of the masonry mortar is estimated by combining the test curves of the compressive strength of the small cube test piece and the compressive strength of the standard cube.
The test strength curve of the compressive strength of the small cube test piece and the compressive strength of the standard cube can be established through the following test:
Firstly, 5 test wall pieces with different mortar strength grades of M2.5, M5, M7.5, M10 and M15 are manufactured, 6 standard cube test blocks of the bottom die of the same block material as the test wall body are reserved in each strength grade, the standard cube test blocks and the wall pieces are maintained under the same condition, after the maintenance age reaches 28 days, 3 standard cube test blocks are tested in each strength grade, and the mortar strength grade is determined; mortar sheets with horizontal mortar joints are obtained from the test wall, and the mortar sheets are polished, cut and stuck in the manner described above to prepare small cube test pieces (shown in figures 2-4) with side lengths of 20mm, 30mm and 40mm respectively, wherein the number of the small cube test pieces in each strength grade and each type of size is 20.
And (3) testing the pressure of the standard cube test piece (obtaining standard cube strength in the same age with the small cube test piece) while testing the pressure of the small cube test piece, wherein the compressive strength results of the small cube test piece are in accordance with normal distribution, and after outlier inspection, a test strength curve of the strength of the small cube test piece and the standard cube strength in the same age is established.
Test researches show that the small cube test piece can be used for detecting the intensity of the wall masonry mortar, and the comparison result of detection accuracy shows that the side length is 30mm optimal, 40mm times and 20mm worst. When a cubic test piece with a side length of 30mm is fitted to a strength measurement curve, the correlation of a linear function, a logarithmic function and a polynomial function is good, and the correlation indexes are all larger than 0.85, as shown in table 1. The comparison analysis of the batch detection confidence interval shows that when the mortar strength is estimated in batches by adopting the cubic test piece with the side length of 30mm, the sample capacity is minimum and only 5 samples are needed.
TABLE 1 fitting Curve summary table of 30mm side Length cube Strength and Standard cube Strength
| Curve type | Fitting formula | Correlation index |
| Linear function | y＝1.8307x-0.7103 | R2＝0.8912 |
| Logarithmic function | y＝8.7294ln(x)-4.7019 | R2＝0.9671 |
| Polynomial function | y＝-0.4369x2+6.3351x-10.225 | R2＝0.9886 |
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (8)
1. The method for detecting the compressive strength of masonry mortar based on the mortar sheet cube test piece is characterized by comprising the following steps:
taking out the masonry horizontal mortar joint masonry mortar sheet from the masonry;
Manufacturing a small cube test piece through processing;
and (3) performing a compression test of the small cube test piece, and estimating the compression strength of the masonry mortar according to the compression strength of the mortar of the small cube test piece.
2. The method for detecting compressive strength of masonry mortar based on mortar sheet cube test pieces of claim 1, wherein processing to make small cube test pieces comprises:
grinding the masonry horizontal mortar joint masonry mortar sheet taken out of the masonry;
Cutting the horizontal mortar joint masonry mortar sheet of the masonry according to the size of the small cube test piece;
And pasting the cut masonry horizontal mortar joint masonry mortar sheet to obtain a small cube test piece.
3. The method for detecting compressive strength of masonry mortar based on a mortar sheet cube test piece according to claim 2, wherein the dimensions of the small cube test piece are 30mm x 30mm.
4. A method for detecting compressive strength of masonry mortar based on a mortar sheet cubic test piece according to claim 3, wherein the side dimension of the polished and cut masonry mortar sheet with horizontal mortar joint is 30mm x 10mm, the plane dimension of the polished and cut masonry mortar sheet with horizontal mortar joint is 30mm x 30mm, and a small cubic test piece with dimension of 30mm x 30mm is obtained by pasting three polished and cut masonry mortar sheets with horizontal mortar joint.
5. The method for detecting compressive strength of masonry mortar based on a mortar slab cube test piece according to claim 1, wherein estimating compressive strength of masonry mortar based on mortar compressive strength of a small cube test piece comprises:
Establishing a test strength curve of the compressive strength of the small cube test piece and the compressive strength of the standard cube through normal distribution hypothesis test and outlier test;
performing pressure test on the small cube test piece;
And according to the pressure test result of the small cube test piece, the compressive strength of the masonry mortar is estimated by combining the test curves of the compressive strength of the small cube test piece and the compressive strength of the standard cube.
6. The method for detecting compressive strength of masonry mortar based on mortar sheet cube test pieces according to claim 5, wherein the type of the measured curve of compressive strength of small cube test pieces and compressive strength of standard cubes is a linear function, and the fitting formula is:
y＝1.8307x-0.7103
wherein y is the compressive strength of a standard cube, x is the compressive strength of a small cube test piece, and the obtained correlation index R 2 = 0.8912.
7. The method for detecting compressive strength of masonry mortar based on mortar sheet cube test pieces according to claim 5, wherein the type of the measured curve of compressive strength of small cube test pieces and compressive strength of standard cubes is a logarithmic function, and the fitting formula is:
y＝8.7294ln(x)-4.7019
Wherein y is the compressive strength of a standard cube, x is the compressive strength of a small cube test piece, and the obtained correlation index R 2 = 0.9671.
8. The method for detecting compressive strength of masonry mortar based on mortar sheet cube test pieces according to claim 5, wherein the type of the measured curve of compressive strength of small cube test pieces and compressive strength of standard cubes is a polynomial function, and the fitting formula is:
y＝-0.4369x2+6.3351x-10.225
Wherein y is the compressive strength of a standard cube, x is the compressive strength of a small cube test piece, and the obtained correlation index R 2 = 0.9886.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311853092.3A CN117907104A (en) | 2023-12-29 | 2023-12-29 | Method for detecting compressive strength of masonry mortar based on mortar sheet cube test piece |
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| CN202311853092.3A CN117907104A (en) | 2023-12-29 | 2023-12-29 | Method for detecting compressive strength of masonry mortar based on mortar sheet cube test piece |
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