CN110108561B - Method for obtaining aggregate-mortar bonding strength change condition in concrete - Google Patents
Method for obtaining aggregate-mortar bonding strength change condition in concrete Download PDFInfo
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Abstract
The invention discloses a method for obtaining the change condition of aggregate-mortar bonding strength in concrete, which comprises the following steps: (1) performing a splitting tensile strength test on the concrete sample; (2) collecting an image of one cleavage plane; (3) counting the splitting aggregate and the desizing aggregate in the splitting surface image, and calculating the areas of the splitting aggregate and the desizing aggregate; (4) calculating the ratio of the area of the split aggregate to the area of all aggregates; (5) and fitting the relationship between the split aggregate proportion and the split tensile strength, and thus obtaining the change condition of the aggregate-mortar interface strength. The invention has reasonable design and convenient operation, provides a reference basis for obtaining the change condition of the concrete aggregate-mortar interface strength by a low-cost technical means, and the reference basis can be completely self-corrected by combining the application of statistics to finally form an industrial guide standard. Therefore, the invention well realizes the balance between the technology and the cost, and is very suitable for large-scale popularization and application.
Description
Technical Field
The invention relates to the technical field of concrete research, in particular to a method for obtaining the change condition of aggregate-mortar bonding strength in concrete.
Background
The concrete is a building material with wide application, and has the advantages of high economical efficiency, strong plasticity, local material availability and the like. The concrete is mainly composed of cement clinker, fine aggregate, coarse aggregate, water and other additives. Under the action of water, cement clinker undergoes hydration reaction to form a grid structure, and coarse aggregate and fine aggregate are bonded together to form the particle reinforced composite material. The interface bonding between aggregate and mortar is called the interface transition zone, where many defects (e.g. calcium hydroxide enrichment) and low strength tend to be present, as shown in fig. 1.
It can be seen that the strength of concrete depends on the bond strength of the aggregate-mortar interface. After the concrete is subjected to catastrophe effects such as high temperature, freeze thawing, sulfate erosion, alternating dynamic load and the like, an aggregate-mortar interface transition area of the concrete is damaged, and the bonding strength of the aggregate-mortar interface is degraded. Therefore, the research on the change of the bonding strength of the concrete aggregate-mortar interface has important significance in scientific research and engineering practice.
However, most concrete aggregates are natural crushed stones or pebbles, and the concrete aggregates are various in composition, limited by geometrical forms and difficult to clamp, so that the change of the bonding strength of an aggregate-mortar interface cannot be effectively obtained by adopting the existing technical means.
Disclosure of Invention
Aiming at the situation, the invention provides a method for obtaining the change situation of the bonding strength of the aggregate-mortar in the concrete, which can directly obtain the change situation of the bonding strength of the aggregate-mortar interface in the concrete and aims at providing a guide standard to provide an important reference basis for related scientific research and engineering practice.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for obtaining the change condition of the bonding strength of aggregate-mortar in concrete comprises the following steps:
(1) performing a splitting tensile strength test on the concrete sample, and splitting the concrete sample into two parts with complementary splitting surfaces;
(2) acquiring an image of one cleavage plane;
(3) counting the split aggregate and the desizing aggregate in the image to obtain the areas of the split aggregate and the desizing aggregate;
(4) calculating the proportion of the split aggregate according to the following formula:
in the formula, RsTo split the aggregate proportion, AsTo split the aggregate area, AdIs the desized aggregate area;
(5) aiming at a limited number of concrete samples of the same type, firstly adopting different high-temperature action means to damage an aggregate-mortar interface, and then executing the steps (1) to (4) one by one to obtain corresponding splitting proportion and splitting compressive strength;
(6) fitting all obtained split aggregate proportions with corresponding split compressive strength to obtain a split aggregate proportion-split compressive strength relation graph;
(7) obtaining the corresponding split aggregate proportion of the same type of concrete under different split compressive strengths according to a split aggregate proportion-split compressive strength relation graph, then setting a comparison, taking the corresponding split aggregate proportion as a reference, and calculating to obtain the aggregate-mortar interface strength change condition based on the comparison when the type of concrete is influenced by different factors.
Further, in the step (1), a splitting tensile strength test is carried out on the concrete sample according to the standard GB/T50081-2002 of common concrete mechanical property test methods.
Specifically, the step (3) includes the steps of:
(3a) according to the surface characteristic properties of the split aggregate and the desizing aggregate, sequentially selecting the split aggregate and the desizing aggregate by using an image processing tool;
(3b) and calculating the number of pixel points of the selected area to respectively obtain the areas of the split aggregate and the desized aggregate.
Further, in the step (3a), when the desized aggregate region is selected, the desized aggregate region and the mortar region need to be simultaneously selected, and the area of the desized aggregate region and the mortar region is calculated by taking the sum of the two regions as the region of the desized aggregate.
Specifically, in the step (7), the change of the strength of the aggregate-mortar interface based on the reference piece when the concrete is influenced by different factors is calculated according to the following formula:
in the formula, X is the reduction or increase proportion of the aggregate-mortar interface strength of the selected concrete sample relative to the comparison piece, R is the split aggregate proportion of the comparison piece, and R' is the split aggregate proportion of the selected concrete sample.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method is based on a concrete splitting tensile strength test, combines splitting plane image acquisition and analysis, calculates the areas of the split aggregate and the desizing aggregate and the split aggregate proportion, then fits a mapping relation graph according to the relation between the split aggregate proportion and the splitting tensile strength, and finally obtains the aggregate-mortar interface strength change condition of the same type of concrete under the influence of different external factors according to the fitted relation graph.
(2) The method for calculating the areas of the split aggregate and the desized aggregate is simple, ingenious and quick, the respective areas of the split aggregate and the desized aggregate can be quickly selected by utilizing the existing image processing tool and combining the surface characteristic properties of the split aggregate and the desized aggregate, and then the split aggregate proportion is accurately calculated based on the areas.
(3) The invention also considers the situation of complementary splitting surfaces according to the characteristics of the desized aggregate, ensures the accuracy of calculating the area of the desized aggregate and provides a good bedding for accurately calculating the proportion of the split aggregate.
(4) The links of the invention are annularly buckled and supplemented with each other, and the effective acquisition of the change condition of the bonding strength of the aggregate-mortar interface is realized by the cooperation of the links. The method is convenient, direct and efficient to obtain, and for the same type of concrete, the more the set influence factors are, the more the test samples and the test times are, the closer the split aggregate proportion-split tensile strength relation diagram fitted by the invention is to the real situation, and the more accurate basis can be provided for the subsequent research and engineering practice aiming at the type of concrete member. For example, when a person skilled in the art needs to research a certain type of concrete under the influence of a certain factor, under the condition of obtaining the fracture compressive strength value, the fracture aggregate proportion can be quickly known according to the fracture aggregate proportion-fracture compressive strength relation diagram provided by the invention, and then the change condition of the concrete relative to the contrast aggregate-mortar interface strength under the condition is calculated according to the fracture aggregate proportion-fracture compressive strength relation diagram, so that the next research can be carried out according to the change condition.
(5) The invention has reasonable design and convenient operation, provides a reference basis for obtaining the change condition of the concrete aggregate-mortar interface strength by a low-cost technical means, and can completely realize self-correction (mainly correction of a split aggregate proportion-split compressive strength relation graph) by combining the application of statistics, thereby finally forming an industrial guide standard. Therefore, the invention well realizes the balance between the technology and the cost, and is very suitable for large-scale popularization and application.
Drawings
FIG. 1 is a schematic view of the microstructure of the transition zone of the concrete aggregate-mortar interface.
FIG. 2 is a schematic flow chart of the present invention.
Fig. 3-5 are schematic diagrams of propagation paths of cracks in the split tensile strength test, wherein fig. 3 is a schematic diagram of crack propagation in the split, fig. 4 is a schematic diagram of crack propagation along an interface, and fig. 5 is a schematic diagram of crack penetration through aggregate.
FIG. 6 is a graph showing the relationship between split aggregate ratio and relative tensile strength in an example of the present invention.
Fig. 7 is a graph showing the relationship between the split aggregate ratio and the relative tensile strength in another example of the present invention.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Examples
The invention provides a scheme capable of directly and effectively obtaining the change condition of the bonding strength of an aggregate-mortar interface in concrete, which is characterized in that the bonding strength of the aggregate-mortar interface in the concrete is indirectly obtained by calculating the area proportion of split aggregates on the splitting surface of a concrete split tensile test piece, the relationship between the split aggregate proportion and the split compressive strength is drawn up, and finally the change condition of the aggregate-mortar interface strength is confirmed by calculation. As shown in FIG. 2, the implementation process of the invention mainly comprises a concrete sample splitting tensile strength test, splitting surface image acquisition, splitting aggregate and desizing aggregate area calculation, splitting aggregate proportion-splitting compressive strength relation chart fitting, and aggregate-mortar interface strength change situation calculation according to the relation chart, and the processes are introduced in turn.
Concrete specimen splitting tensile strength test
And (3) performing a splitting tensile strength test on the concrete sample, splitting the concrete sample into two parts with complementary splitting surfaces, wherein the splitting tensile strength test is executed according to the standard of the test method for the mechanical properties of common concrete GB/T50081 plus 2002. And two splitting surfaces of the split test piece are complementary.
When the concrete sample is split, the crack can expand along a tensile zone, and when the concrete sample meets the aggregate, the crack has two expansion paths, or expands along the interface of the aggregate mortar, or directly splits the aggregate to penetrate through the aggregate to expand, as shown in figures 3-5. The path of propagation of a crack depends on how easily it is cracked along this path.
If the strength of the aggregate is higher than the bonding strength of the aggregate-mortar interface, cracks tend to propagate along the aggregate-mortar interface, and at this time, aggregate desizing is shown on cleavage planes, i.e., the aggregate is completely separated from the mortar, a complete aggregate is left on one cleavage plane, and the mortar combined with the complete aggregate is left on the other cleavage plane. If the strength of the aggregate is lower than the bond strength of the aggregate-mortar interface, cracks tend to develop through the aggregate, leaving a portion of the aggregate cleaved on each of the two cleavage planes.
Therefore, the split aggregate proportion on the splitting surface of the concrete sample is the result of the competitive relationship of the crack propagation path, namely the result of the relationship between the strength of the aggregate and the strength of the aggregate-mortar interface.
Two, split plane image acquisition
Based on the theory of the first point, since the two cleavage planes of the test piece are complementary, it is possible to perform image acquisition (for example, taking a photograph with a high-precision industrial camera) on only one of the cleavage planes, and then perform image analysis.
Third, area calculation of split aggregate and desizing aggregate
The key point of the step is that the cleavage aggregate and the desizing aggregate are selected in sequence by an image processing tool according to the surface characteristic properties of the cleavage aggregate and the desizing aggregate, and then the cleavage aggregate and the desizing aggregate in the image are counted to obtain the areas of the cleavage aggregate and the desizing aggregate.
Firstly, the split aggregate is very obvious from the desized aggregate, and generally speaking, the split aggregate has a clean surface, a clear boundary and a bright color, while the desized aggregate has a dull color and a fuzzy boundary. The split aggregate can therefore be very easily selected from the picture using image processing tools (e.g. the quick selection tool in Photoshop) and then the desized aggregate can be selected in the same way.
And then, calculating the number of pixel points of the selected area to respectively obtain the areas of the split aggregate and the desized aggregate. It should be noted that when selecting the desized aggregate, not only the desized aggregate region but also the mortar region need to be selected, because the desized aggregate region complementary to the mortar region exists on the other complementary cleavage plane, the area of the desized aggregate region needs to be calculated by taking the sum of the two regions as the desized aggregate region, and the accuracy of the desized aggregate area can be ensured.
Fourth, split aggregate proportion calculation
After respective areas of the split aggregate and the desized aggregate are calculated, the proportion of the split aggregate is calculated according to the following formula:
in the formula, RsTo split the aggregate proportion, AsTo split the aggregate area, AdIs the desized aggregate area.
In this embodiment, each group can calculate the split aggregate proportion of the three split surfaces, and then take the average value as the proportion of the group of split aggregates.
Fifthly, fitting a split aggregate proportion-split compressive strength relation graph
Aiming at the limited concrete samples of the same type, different measures (such as setting different temperatures) are adopted to damage the aggregate-mortar interface, and then the corresponding split aggregate proportion and the split compressive strength are obtained according to the process one by one.
And then, fitting all the obtained split aggregate proportions with the corresponding split compressive strength to obtain a split aggregate proportion-split compressive strength relation graph.
Sixthly, calculating and obtaining the change condition of the interface strength of the aggregate-mortar according to the relational graph
Obtaining the corresponding split aggregate proportion of the same type of concrete under different split compressive strengths according to a split aggregate proportion-split compressive strength relation diagram, then setting a comparison (for example, taking a concrete sample which is not subjected to damage operation as the comparison), and taking the corresponding split aggregate proportion as a reference, namely calculating the aggregate-mortar interface strength change condition based on the comparison when the type of concrete is influenced by different factors. The invention adopts the following formula to calculate the change condition of the aggregate-mortar interface strength based on the contrast when the concrete is influenced by different factors:
in the formula, X is the reduction or increase proportion of the aggregate-mortar interface strength of the selected concrete sample relative to the comparison piece, R is the split aggregate proportion of the comparison piece, and R' is the split aggregate proportion of the selected concrete sample.
The invention is described below in a case:
the selected concrete test piece specification is as follows:
shape: cube, side length: 100mm, prepared according to the formula of Table 1.
TABLE 1 mix proportion (kg/m) of concrete test pieces selected for the examples3)
| Cement | Fly ash | Sand | Water reducing agent | Water (W) | Coarse aggregate | w/c | 90 days compressive strength (MPa) |
| 412 | 103 | 571 | 1.545 | 149 | 1162 | 0.29 | 73.2 |
After the pouring of the test piece is finished, the test piece is cured in a mold (no more than 24 hours), then the mold is removed, and the test piece is placed in an environment with the temperature of 20 ℃ and the relative humidity of 95% for curing for 28 days, and finally the test piece is cured in an indoor environment for 90 days.
And carrying out damage operation on an aggregate-mortar interface in the concrete sample by utilizing the high-temperature action. The set high temperature action temperatures are 400 ℃ and 600 ℃, respectively, so that the aggregate-mortar interface strength of the concrete test piece is damaged. The high temperature action is carried out in a box type resistance furnace, the temperature rising speed is 5 ℃/min, the temperature is kept for 60 minutes after the temperature is raised to the target temperature, and then the test piece is cooled to the room temperature along with the furnace.
Then, dividing the cooled test pieces into two groups, wherein one group is directly used for carrying out the splitting tensile strength test; and the other group is soaked in water for 30 days for re-curing, so that the dehydrated products in the other group are rehydrated, and after the aggregate-mortar interface of the concrete is repaired, the splitting tensile strength test is carried out. Meanwhile, a group of test pieces without high temperature effect are adopted to carry out the splitting tensile strength test as a comparison.
The areas of the cleaved aggregate and the desized aggregate of the three test pieces are counted, the ratio of the cleaved aggregate is calculated, and the result is shown in table 2.
Table 2 example split aggregate statistics
The tensile strength at split of the test piece subjected to the high temperature treatment was converted to the relative tensile strength at split, that is, the percentage of the tensile strength of the test piece subjected to the high temperature treatment to the tensile strength of the control test piece (that is, 56.8%, 73.7%, 35.2%, 53.8% in table 2).
The relative cleavage tensile strength and the cleavage aggregate proportion are fitted to obtain a relationship between the relative cleavage tensile strength (percentage value) and the cleavage aggregate proportion, as shown in fig. 6 and 7, fig. 6 is a relationship diagram between the relative cleavage tensile strength and the cleavage aggregate proportion of the concrete sample after being subjected to a high temperature action at 400 ℃, and fig. 7 is a relationship diagram between the relative cleavage tensile strength and the cleavage aggregate proportion of the concrete sample after being subjected to a high temperature action at 600 ℃. It can be seen that a good composite linear relationship exists between the split aggregate proportion and the split tensile strength, and the correlation coefficient is greater than 0.97, so that the split tensile strength and the split aggregate proportion are considered to be in a linear relationship.
According to the scheme design of the invention, the change condition of the aggregate-mortar interface strength of the concrete test piece is calculated compared with that of a control test piece after the concrete test piece is subjected to the high temperature actions of 400 ℃ and 600 ℃.
Compared with a control test piece, after the concrete is acted at 400 ℃, the reduction degree of the aggregate-mortar interface strength is as follows:
(58.47-25.5)/58.47×100％＝56.39％；
namely, the aggregate mortar-interface strength is reduced to 43.61% without high temperature action.
After re-curing, the interface strength of the aggregate-mortar is recovered, and the recovery degree is as follows:
(58.47-36.2)/58.47×100％＝38.09％；
namely, the interface strength of the aggregate mortar is recovered to 61.91 percent of that without high temperature action.
In the same way, after the concrete is acted at the temperature of 600 ℃, the reduction degree of the aggregate-mortar interface strength is as follows:
(58.47-15.74)/58.47×100％＝73.08％；
namely, the interface strength of the aggregate mortar is reduced to 26.92 percent without high temperature effect.
After curing, the recovery degree of the aggregate-mortar interface strength is as follows:
(58.47-34.08)/58.47×100％＝41.71％；
namely, the aggregate mortar-interface strength is recovered to 58.29 percent without high temperature action.
Therefore, the change condition of the aggregate-mortar interface strength of the concrete of the type after the action of high temperature of 400 ℃ and 600 ℃ can be obtained.
In conclusion, the scheme of the invention can embody and digitize the change situation of the aggregate mortar-interface strength, which provides a good reference standard for subsequent research. The invention obtains related objects to be detected (cleavage planes) by using the existing standard test, then fits a cleavage aggregate proportion-cleavage tensile strength relation graph suitable for the concrete according to the conditions of a plurality of objects to be detected, and finally can directly calculate the change condition of the aggregate-mortar interface strength according to the relation graph.
The scheme of the invention is seemingly simple, is not easy to think, and can fully integrate the known technical means in a simple and efficient manner only by deeply researching and understanding the characteristics of the concrete, particularly the change characteristics of the aggregate mortar-interface strength, so as to quickly obtain the change condition of the concrete aggregate mortar-interface strength. Compared with the prior art, the technical scheme designed by the invention realizes unexpected technical effects. Moreover, for the same type of concrete, the more the set influence factors are, the more the test samples and the test times are, the closer the split aggregate proportion-split tensile strength relation graph fitted by the method is to the real situation, and the accurate reference basis can be provided for the subsequent research and engineering practice aiming at the type of concrete.
The above examples are only one of the preferred embodiments of the present invention and various modifications to these examples will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the invention should not be limited to the embodiments shown herein.
Claims (5)
1. A method for obtaining the change condition of the bonding strength of aggregate-mortar in concrete is characterized by comprising the following steps:
(1) performing a splitting tensile strength test on the concrete sample, and splitting the concrete sample into two parts with complementary splitting surfaces;
(2) acquiring an image of one cleavage plane;
(3) counting the split aggregate and the desizing aggregate in the image to obtain the areas of the split aggregate and the desizing aggregate;
(4) calculating the proportion of the split aggregate according to the following formula:
in the formula (I), the compound is shown in the specification,R s in order to split the proportion of the aggregate,A s in order to split the area of the aggregate,A d is the desized aggregate area;
(5) aiming at a limited number of concrete samples of the same type, firstly adopting different high-temperature action means to damage an aggregate-mortar interface, and then executing the steps (1) to (4) one by one to obtain corresponding splitting proportion and splitting compressive strength;
(6) fitting all obtained split aggregate proportions with corresponding split compressive strength to obtain a split aggregate proportion-split compressive strength relation graph;
(7) obtaining the corresponding split aggregate proportion of the same type of concrete under different split compressive strengths according to a split aggregate proportion-split compressive strength relation diagram, then setting a comparison, taking the corresponding split aggregate proportion as a reference, and calculating to obtain the aggregate-mortar interface strength change condition based on the comparison when the type of concrete is influenced by different high temperatures.
2. The method for obtaining the aggregate-mortar bond strength change condition in concrete according to claim 1, wherein in the step (1), the concrete specimen is subjected to the splitting tensile strength test according to the general concrete mechanical property test method standard GB/T50081-2002.
3. A method for obtaining aggregate-mortar bond strength variation in concrete according to claim 1 or 2, characterized in that said step (3) comprises the following steps:
(3a) according to the surface characteristic properties of the split aggregate and the desizing aggregate, sequentially selecting the split aggregate and the desizing aggregate by using an image processing tool;
(3b) and calculating the number of pixel points of the selected area to respectively obtain the areas of the split aggregate and the desized aggregate.
4. The method for obtaining aggregate-mortar bond strength variation in concrete according to claim 3, wherein in the step (3a), when the desized aggregate area is selected, the desized aggregate area and the mortar area are simultaneously selected, and the area is calculated by taking the sum of the two areas as the area of the desized aggregate.
5. The method for obtaining the aggregate-mortar bond strength change in the concrete according to claim 4, wherein in the step (7), the aggregate-mortar interface strength change based on the reference piece when the concrete is affected by different high temperatures is calculated according to the following formula:
in the formula (I), the compound is shown in the specification,
the ratio of the reduction or the increase of the aggregate-mortar interface strength of the selected concrete test piece relative to the reference piece is determined,
the split aggregate ratio for the control,
the split aggregate proportion of the selected concrete sample.
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