CN111751188B - Macroscopic fracture mechanical analysis method for large-mixing-amount rubber concrete - Google Patents
Macroscopic fracture mechanical analysis method for large-mixing-amount rubber concrete Download PDFInfo
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Abstract
The invention discloses a microscopic fracture mechanics analysis method of large-doped rubber concrete, which comprises the following steps: preparing a test piece, pretreating the test piece, slicing and scanning the test piece, simulating a microscopic structure of the test piece, and analyzing and comparing a real test with a simulated test; according to the invention, the cubic test piece with different rubber doping amounts is prepared through reasonable raw material proportion, the test piece is pretreated to be conveniently scanned by a full-automatic panoramic fluorescence microscope, so that the porosity of concrete is conveniently observed, the influence of the rubber doping amount on the mechanical property of the rubber concrete is further analyzed based on a microstructure, then the microstructure of the test piece is simulated according to a scanning image of a sample slice to generate a microstructure model of the rubber concrete, and then the real test of the test piece is analyzed and compared with the simulation test of the microstructure model of time, so that the influence of the rubber doping amount on the macroscopic fracture performance of the rubber concrete is analyzed based on the microstructure, and the method has better applicability and accuracy.
Description
Technical Field
The invention relates to the technical field of material performance analysis, in particular to a microscopic fracture mechanics analysis method for large-doped rubber concrete.
Background
The rubber concrete is prepared by mixing, molding and curing rubber emulsion, auxiliary additives and cement when cement mortar or concrete is prepared, has excellent impact resistance and wear resistance, and can better solve the problem of recycling waste rubber products at the same time;
in order to promote the popularization and application of the large-doped rubber concrete in actual engineering such as water conservancy, civil engineering, traffic and the like, the fracture performance of the rubber concrete needs to be analyzed to reveal the fracture performance mechanism of the rubber concrete and prolong the service life of a rubber concrete structure, but the analysis on the fracture process mechanism of the large-doped rubber concrete is less at present, the analysis result is mostly not representative, and the macroscopic performance of the material performance is often indistinguishable from the microscopic mechanics, and the microscopic numerical simulation can effectively reflect the deformation and the cracking state of the structure under the load action, so the invention provides the microscopic fracture mechanics analysis method of the large-doped rubber concrete to solve the problems in the prior art.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a microscopic fracture mechanics analysis method for large-doped rubber concrete, the method comprises the steps of firstly, regarding the rubber concrete as a multiphase composite material consisting of rubber, coarse aggregate, a mortar matrix, a rubber-mortar interface transition area, a coarse aggregate-mortar interface transition area and interface initial defects, and then, establishing a two-dimensional rubber concrete microscopic structure based on a real microscopic structure of a rubber concrete interface so as to represent the influence of the rubber doping on the macroscopic fracture performance of the rubber concrete through the microscopic structure, so that the analysis method has better applicability and accuracy.
In order to achieve the purpose of the invention, the invention is realized by the following technical scheme: a mechanical analysis method for microscopic fracture of large-doped rubber concrete comprises the following steps:
the method comprises the following steps: preparation of test pieces
Putting portland cement, fine aggregate, coarse aggregate, rubber particles and water into a stirrer according to a specified proportion for stirring and mixing, pouring and molding after uniform mixing to obtain rubber concrete cubic test pieces with length, width and height of 100 multiplied by 100mm and different rubber particle mixing amounts, and then putting the poured rubber concrete cubic test pieces with different rubber particle mixing amounts into a standard curing chamber for curing, wherein the curing age is 28 days;
step two: pretreatment of test pieces
According to the first step, taking out a cubic test piece which is reached in the maintenance age, cutting a test piece slice with the length, width and height of 100 multiplied by 15mm, polishing the observation surface of the test piece slice by using an automatic polishing machine, cleaning the polished test piece slice, wiping the surface water stain after the cleaning is finished, putting the wiped test piece slice into a vacuum drying box for fully drying, putting the dried test piece slice into a vacuum impregnation box for vacuumizing, filling epoxy resin doped with fluorescent powder for finishing impregnation, taking out the test piece slice after the impregnation is finished, coating a layer of epoxy resin on the observation surface of the test piece slice, standing for 35 minutes, scraping the residual epoxy resin on the surface, and performing secondary polishing on the test piece slice;
step three: specimen slice scanning
According to the second step, firstly, scanning panoramic microscopic images of sample slices with different rubber mixing amounts after secondary polishing through a full-automatic panoramic fluorescence microscope, obtaining the panoramic microscopic images of observation surfaces of the sample slices, and observing the porosity of the sample slices with different mixing amounts through the obtained panoramic microscopic images to obtain the influence of the mixing amount of the rubber particles on the mechanical property of the rubber concrete;
step four: test piece mesoscopic structure simulation
According to the third step, firstly, according to a panoramic microscopic image, throwing the coarse aggregate and the rubber on a two-dimensional plane through Matlab software, simplifying the coarse aggregate into a polygon based on a real structure, simplifying the rubber into a circle, establishing a model, writing a particle flow analysis program based on Matlab software by means of a Monte Carlo method according to the distribution rule of the coarse aggregate and the rubber to generate a two-dimensional rubber concrete rubber and coarse aggregate structural model, further acquiring position information of the generated rubber and coarse aggregate particles, expanding the position information to a certain width, then writing the program to generate a rubber-mortar interface and a coarse aggregate-mortar interface, adjusting the center coordinates and the radius of the rubber and rubber-mortar interface after running, obtaining the multipoint position coordinates of the coarse aggregate and the coarse aggregate-mortar interface, then carrying out parametric design language based on ANSYS software after obtaining the position coordinates of each phase of materials, completing establishment of a mortar matrix and rubber, the coarse aggregate, the rubber-mortar interface transition area and the coarse aggregate-mortar interface transition area, and finally generating a rubber concrete microscopic structural model;
step five: analysis and comparison of real test and simulation experiment
According to the fourth step, firstly, a universal testing machine is adopted to carry out real fracture resistance tests on cubic test pieces with different rubber mixing amounts and record the test results, then the rubber concrete mesoscopic structure model is subjected to simulated fracture resistance tests according to the real tests and the test conclusions are stored, and then the real test results and the simulated test conclusions are compared and analyzed to obtain the relation between mesoscopic mechanics and macroscopic expressions of the rubber concrete fracture properties with different mixing amounts.
The further improvement lies in that: in the first step, the coarse aggregate is formed by mixing small limestone stones with the particle size of 5-10mm and large limestone stones with the particle size of 10-20mm according to the proportion of 3.
The further improvement is that: in the second step, in the polishing process of the sample slice, firstly polishing for 20 minutes by using the abrasive with the specification of 300#, then polishing for 10 minutes by using the abrasive with the specification of 800#, and finally polishing for 5 minutes by using the abrasive with the specification of 1000#, wherein the rotating speed of the automatic polishing machine is set to be 50r/min in the polishing process.
The further improvement lies in that: and in the second step, the vacuum degree in the vacuum drying oven is kept above 0.9, the temperature of the vacuum drying oven is set to be 40 ℃, sample slices are taken out every 6 hours in the drying process and weighed, and when the mass loss of the sample slices in 24 hours is less than 0.1g, the drying is finished.
The further improvement is that: in the third step, when the sample slice is scanned, the observation area of the selected sample slice is within the range of 90mm multiplied by 90mm, meanwhile, the observation area is equally divided into nine equal parts for observation, and the image obtained by scanning is formed by splicing nine sub-images of which the pixels are 12664 multiplied by 12664.
The further improvement lies in that: in the fourth step, a two-dimensional conversion formula which is derived by a Walraven J.C method based on probability statistics and accords with a three-dimensional Fuller grading curve is adopted to ensure the convenience of numerical simulation of the two-dimensional rubber concrete, and the formula is
In the formula P c The diameter d of any point on the cross section of the rubber concrete is less than d 0 Probability of (P) K The volume of the particles is the percentage of the total volume of the rubber concrete, d is the actually required particle diameter of the particles, d 0 For a defined particle size, d max The largest particle size.
The invention has the beneficial effects that: the invention firstly prepares a rubber concrete cubic test piece with different rubber mixing amounts through reasonable raw material proportion, then cuts, polishes, cleans, dries, vacuum impregnates and polishes the test piece for the second time to make the test piece slice convenient to be scanned and observed by a full-automatic panoramic fluorescence microscope, thus being convenient to observe the porosity of the concrete, and then analyzes the influence of the mixing amount of the rubber on the mechanical property of the rubber concrete based on the microstructure, then simulates the microscopic structure of the test piece according to the scanned image of the test piece and generates a rubber concrete microscopic structure model, and then analyzes and contrasts the real test of the test piece and the simulation test of the microscopic structure model of the time, thereby analyzing the influence of the rubber mixing amount on the macroscopic fracture property of the rubber concrete based on the microscopic structure.
Drawings
FIG. 1 is a flow chart of the steps of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
According to the illustration in fig. 1, the embodiment provides a mechanical analysis method for microscopic fracture of large-content rubber concrete, which includes the following steps:
the method comprises the following steps: preparation of test pieces
Mixing fine aggregate consisting of portland cement and natural river sand, limestone small stones with the particle size of 5-10mm and limestone large stones with the particle size of 10-20mm in a ratio of 3;
step two: pretreatment of test pieces
According to the first step, a cube test piece which is reached in the maintenance age is taken out and cut into test piece slices with the length, width and height of 100 multiplied by 15mm, an observation surface of the test piece slices is polished by an automatic polishing machine, a grinding material with the specification of 300# is firstly polished for 20 minutes in the polishing process, a grinding material with the specification of 800# is then polished for 10 minutes, and finally a grinding material with the specification of 1000# is polished for 5 minutes, the rotating speed of the automatic polishing machine is set to be 50r/min in the polishing process, the polished test piece slices are cleaned and the surface is wiped with water after being cleaned, the wiped test piece slices are put into a vacuum drying box to be fully dried, the vacuum degree in the vacuum drying box is kept to be more than 0.9 in the drying process, the temperature is set to be 40 ℃, the test piece slices are taken out every 6 hours in the drying process to be weighed, when the mass loss of the test piece slices is less than 0.1g in the drying process, the dried test piece slices are put into a vacuum impregnation box to be vacuumized and put into the epoxy resin in the epoxy impregnation box to be impregnated into the epoxy resin, the epoxy resin layer is taken out, the test piece slices, the epoxy resin is soaked in the epoxy resin layer, the epoxy resin layer is taken out, the epoxy resin layer is scraped and the epoxy resin layer, the epoxy resin layer is scraped and the epoxy resin layer is left on the surface of the test piece, and the epoxy resin layer is scraped and the epoxy resin layer, and the epoxy resin layer is scraped for 35 minutes after the observation surface;
step three: specimen slice scanning
According to the second step, firstly, scanning panoramic microscopic images of sample slices with different rubber mixing amounts after secondary grinding through a full-automatic panoramic fluorescence microscope and obtaining the panoramic microscopic images of observation surfaces of the sample slices, when the sample slices are scanned, selecting sample slice observation areas within a range of 90mm multiplied by 90mm, equally dividing the observation areas into nine equal parts for observation, splicing nine sub-images with 12664 multiplied by 12664 pixels to obtain images obtained through scanning, and observing the porosity of the sample slices with different mixing amounts through the obtained panoramic microscopic images to obtain the influence of the mixing amount of rubber particles on the mechanical property of the rubber concrete;
step four: microscopic structure simulation of test piece
According to the third step, firstly, according to a panoramic microscopic image, throwing coarse aggregate and rubber on a two-dimensional plane through Matlab software, simplifying the coarse aggregate into a polygon based on a real structure, simplifying the rubber into a circle, establishing a model, then writing a particle flow analysis program based on Matlab software by means of a Monte Carlo method according to the distribution rule of the coarse aggregate and the rubber to generate a two-dimensional rubber concrete rubber and coarse aggregate structure model, further acquiring position information of the generated rubber and coarse aggregate particles, expanding the position information to a certain width, then writing the program to generate a rubber-mortar interface and a coarse aggregate-mortar interface, adjusting the center coordinates and the radius of the rubber and rubber-mortar interface after running, obtaining the multipoint position coordinates of the coarse aggregate and the mortar interface, then carrying out parametric design language based on ANSYS software after acquiring the position coordinates of each phase of materials, completing establishment of a transition area between the mortar matrix and the rubber, the coarse aggregate, the rubber-mortar interface and the transition area, and the coarse aggregate-mortar interface, and finally generating a rubber concrete microstructure model, and deducing a three-dimensional probability formula based on a Fulley statistical formula of a WalveJ
In the formula P c The diameter d of any point on the cross section of the rubber concrete is less than d 0 Probability of (P) K The volume of the particles is the percentage of the total volume of the rubber concrete, d is the actually required particle diameter of the particles, d 0 To a defined particle size, d max The largest particle size;
step five: analysis and comparison of real test and simulation experiment
According to the fourth step, firstly, a universal testing machine is adopted to carry out real fracture resistance tests on cubic test pieces with different rubber mixing amounts and record the test results, then simulated fracture resistance tests are carried out on the microscopic structure models of the rubber concrete according to the real tests and the test conclusions are stored, and then the real test results and the simulated test conclusions are compared and analyzed to obtain the relationship between microscopic mechanics and macroscopic performances of the fracture performance of the rubber concrete with different mixing amounts.
The microscopic fracture mechanical analysis method of the large-doping-amount rubber concrete comprises the steps of preparing a cubic rubber concrete test piece with different rubber doping amounts through reasonable raw material proportion, cutting, polishing, cleaning, drying, vacuum impregnation and secondary polishing treatment on the test piece to enable a sample slice to be conveniently scanned and observed by a full-automatic panoramic fluorescence microscope, so that the porosity of concrete can be conveniently observed, further the influence of the doping amount of rubber on the mechanical property of the rubber concrete can be analyzed based on a microstructure, then simulation of a microscopic structure of the test piece is carried out according to a scanning image of the sample slice to generate a microscopic rubber concrete structure model, then a real test of the test piece is compared with a simulation test of the microscopic structure model in time, so that the influence of the doping amount of the rubber on the macroscopic fracture property of the rubber concrete can be analyzed based on the microscopic structure, the two-dimensional rubber concrete is established by regarding the rubber concrete as a composite material consisting of a rubber, a coarse aggregate matrix, a multiphase rubber-mortar interface transition area, a coarse aggregate-mortar interface transition area and an interface initial defect, so that the microscopic structure has good applicability to the macroscopic fracture property of the rubber concrete by regarding the rubber concrete as a method for characterizing the microscopic structure.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A method for analyzing the microscopic fracture mechanics of large-doped rubber concrete is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: preparation of test pieces
Putting portland cement, fine aggregate, coarse aggregate, rubber particles and water into a stirrer according to a specified proportion for stirring and mixing, pouring and molding after uniform mixing to obtain rubber concrete cubic test pieces with length, width and height of 100 multiplied by 100mm and different rubber particle mixing amounts, and then putting the poured rubber concrete cubic test pieces with different rubber particle mixing amounts into a standard curing chamber for curing, wherein the curing age is 28 days;
step two: pretreatment of test pieces
According to the first step, taking out a cubic test piece which is reached in the maintenance age, cutting a test piece slice with the length, width and height of 100 multiplied by 15mm, polishing the observation surface of the test piece slice by using an automatic polishing machine, cleaning the polished test piece slice, wiping the surface water stain after the cleaning is finished, putting the wiped test piece slice into a vacuum drying box for fully drying, putting the dried test piece slice into a vacuum impregnation box for vacuumizing, filling epoxy resin doped with fluorescent powder for finishing impregnation, taking out the test piece slice after the impregnation is finished, coating a layer of epoxy resin on the observation surface of the test piece slice, standing for 35 minutes, scraping the residual epoxy resin on the surface, and performing secondary polishing on the test piece slice;
step three: specimen slice scanning
According to the second step, firstly, scanning panoramic microscopic images of sample slices with different rubber mixing amounts after secondary polishing through a full-automatic panoramic fluorescence microscope, obtaining the panoramic microscopic images of observation surfaces of the sample slices, and observing the porosity of the sample slices with different mixing amounts through the obtained panoramic microscopic images to obtain the influence of the mixing amount of the rubber particles on the mechanical property of the rubber concrete;
step four: test piece mesoscopic structure simulation
According to the third step, firstly, according to a panoramic microscopic image, throwing the coarse aggregate and the rubber on a two-dimensional plane through Matlab software, simplifying the coarse aggregate into a polygon based on a real structure, simplifying the rubber into a circle, establishing a model, writing a particle flow analysis program based on Matlab software by means of a Monte Carlo method according to the distribution rule of the coarse aggregate and the rubber to generate a two-dimensional rubber concrete rubber and coarse aggregate structural model, further acquiring position information of the generated rubber and coarse aggregate particles, expanding the position information to a certain width, then writing the program to generate a rubber-mortar interface and a coarse aggregate-mortar interface, adjusting the center coordinates and the radius of the rubber and rubber-mortar interface after running, obtaining the multipoint position coordinates of the coarse aggregate and the coarse aggregate-mortar interface, then carrying out parametric design language based on ANSYS software after obtaining the position coordinates of each phase of materials, completing establishment of a mortar matrix and rubber, the coarse aggregate, the rubber-mortar interface transition area and the coarse aggregate-mortar interface transition area, and finally generating a rubber concrete microscopic structural model;
step five: analysis and comparison of real test and simulation experiment
According to the fourth step, firstly, a universal testing machine is adopted to carry out real fracture resistance tests on cubic test pieces with different rubber mixing amounts and record the test results, then simulated fracture resistance tests are carried out on the microscopic structure models of the rubber concrete according to the real tests and the test conclusions are stored, and then the real test results and the simulated test conclusions are compared and analyzed to obtain the relationship between microscopic mechanics and macroscopic performances of the fracture performance of the rubber concrete with different mixing amounts.
2. The method for mechanical analysis of microscopic fracture of rubber concrete with large content according to claim 1, wherein the method comprises the following steps: in the first step, the coarse aggregate is formed by mixing small limestone stones with the particle size of 5-10mm and large limestone stones with the particle size of 10-20mm according to the proportion of 3.
3. The method for mechanical analysis of microscopic fracture of rubber concrete with large content according to claim 1, wherein the method comprises the following steps: in the second step, in the polishing process of the sample slice, firstly polishing for 20 minutes by using the abrasive with the specification of 300#, then polishing for 10 minutes by using the abrasive with the specification of 800#, and finally polishing for 5 minutes by using the abrasive with the specification of 1000#, wherein the rotating speed of the automatic polishing machine is set to be 50r/min in the polishing process.
4. The method for mechanical analysis of microscopic fracture of rubber concrete with large content according to claim 1, wherein the method comprises the following steps: and in the second step, the vacuum degree in the vacuum drying oven is kept above 0.9, the temperature of the vacuum drying oven is set to be 40 ℃, sample slices are taken out every 6 hours in the drying process and weighed, and when the mass loss of the sample slices in 24 hours is less than 0.1g, the drying is finished.
5. The method for mechanical analysis of microscopic fracture of rubber concrete with large content according to claim 1, wherein the method comprises the following steps: in the third step, when the sample slice is scanned, the observation area of the selected sample slice is within the range of 90mm multiplied by 90mm, meanwhile, the observation area is equally divided into nine equal parts for observation, and the image obtained by scanning is formed by splicing nine sub-images of which the pixels are 12664 multiplied by 12664.
6. The method for mechanical analysis of microscopic fracture of rubber concrete with large content according to claim 1, wherein the method comprises the following steps: in the fourth step, a two-dimensional conversion formula which is derived by a Walraven J.C probability statistics-based method and accords with a three-dimensional Fuller grading curve is adopted to ensure the convenience of numerical simulation of the two-dimensional rubber concrete, and the formula is
In the formula P c The diameter d of any point on the cross section of the rubber concrete is less than d 0 Probability of (P) K The volume of the particles is the percentage of the total volume of the rubber concrete, d is the actually required particle diameter of the particles, d 0 For a defined particle size, d max The largest particle size.
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