CN115372123A - Method for evaluating toughness of basalt fiber cold-mixed epoxy SMA-10 mixture - Google Patents

Method for evaluating toughness of basalt fiber cold-mixed epoxy SMA-10 mixture Download PDF

Info

Publication number
CN115372123A
CN115372123A CN202210987286.1A CN202210987286A CN115372123A CN 115372123 A CN115372123 A CN 115372123A CN 202210987286 A CN202210987286 A CN 202210987286A CN 115372123 A CN115372123 A CN 115372123A
Authority
CN
China
Prior art keywords
mixture
test piece
sma
basalt fiber
cold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210987286.1A
Other languages
Chinese (zh)
Inventor
任全生
韩方元
肖鹏
王业
康爱红
薛晓薇
邬惠娟
杨洋
郭瑞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Tianlong Continuous Basalt Fiber Co ltd
Yangzhou University
Ningxia Communications Constructions Co Ltd
Original Assignee
Jiangsu Tianlong Continuous Basalt Fiber Co ltd
Yangzhou University
Ningxia Communications Constructions Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Tianlong Continuous Basalt Fiber Co ltd, Yangzhou University, Ningxia Communications Constructions Co Ltd filed Critical Jiangsu Tianlong Continuous Basalt Fiber Co ltd
Priority to CN202210987286.1A priority Critical patent/CN115372123A/en
Publication of CN115372123A publication Critical patent/CN115372123A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/26—Bituminous materials, e.g. tar, pitch
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/32—Polishing; Etching
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/36—Embedding or analogous mounting of samples
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/38—Diluting, dispersing or mixing samples
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/42—Low-temperature sample treatment, e.g. cryofixation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/44—Sample treatment involving radiation, e.g. heat
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • G01N2001/2873—Cutting or cleaving
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0062—Crack or flaws
    • G01N2203/0066—Propagation of crack
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0298—Manufacturing or preparing specimens
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
    • G01N2203/0647—Image analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle

Landscapes

  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Road Paving Structures (AREA)

Abstract

The invention discloses a method for evaluating the toughness of a basalt fiber cold-mixed epoxy SMA-10 mixture, which comprises the following steps of 1) preparing a basalt fiber cold-mixed epoxy SMA-10 mixture, adding coarse and fine aggregates and fibers into a mixing pot; and (3) adding the cold-mixed epoxy asphalt after uniform stirring, adding the mineral powder after uniform stirring, and forming a test piece after uniform stirring. 2) Evaluating the toughness of the mixture, cutting and processing the test piece to obtain an LTTB test piece; performing LTTB test, and simultaneously recording the cracking process of the test piece by using a high-speed camera to obtain a mixture slice image; analysis was performed using the Ncorr program in Matlab software; acquiring the displacement and the strain of a test piece; calculating and analyzing related indexes; further, the toughness of the mixed material was evaluated. The basalt fiber cold-mixed epoxy SMA-10 mixture prepared by the invention can be used for quick maintenance and filling of pavement layers of high-grade pavements and heavy-duty steel bridge decks, and the evaluation method can accurately evaluate the toughness of the mixture.

Description

Method for evaluating toughness of basalt fiber cold-mixed epoxy SMA-10 mixture
Technical Field
The invention relates to the technical field of highway and bridge engineering, in particular to a method for evaluating the toughness of a basalt fiber cold-mix epoxy SMA-10 mixture.
Background
The steel bridge pavement is a special pavement structure on a steel bridge, and is becoming a main way for China to provide a passage for crossing large obstacles. The epoxy asphalt mixture has high strength, good toughness, good aging resistance and chemical erosion resistance, has elasticity at the typical pavement use temperature of 50 ℃ and provides high fatigue resistance, and is widely applied to pavement engineering of heavy-duty traffic road sections, airports and steel bridge decks. At present, the production process of introducing hot-mix epoxy asphalt into a mixture is complex, the requirement on a test piece and temperature is extremely high in construction due to the thermosetting property of the hot-mix epoxy asphalt, the construction quality is difficult to guarantee, and a large amount of asphalt smoke and carbon dioxide are generated. With the popularization of the national carbon peak reaching and carbon neutralization concepts, the cold-mixed epoxy asphalt has the advantages of convenience in construction, short maintenance time, energy conservation, environmental friendliness and the like, and becomes a vital steel bridge deck pavement material.
The asphalt mastic macadam mixture (SMA) has excellent performance, such as rutting resistance, reflection cracking resistance, fatigue resistance and the like, and is widely applied to engineering practice. The biggest difference from the common asphalt mixture lies in the high requirement of asphalt performance, on one hand, the asphalt is prevented from dripping and leaking, on the other hand, the temperature sensitivity of the asphalt is reduced, the viscosity of the cementing material is improved, and therefore the pavement performance of the mixture is comprehensively improved.
Compared with the common epoxy asphalt mixture, the fiber serving as a high-performance reinforced material can be uniformly dispersed in the epoxy asphalt mixture to form a net structure, the single-doped polyester fiber has good adsorbability on asphalt, and the single-doped polyester fiber can effectively adsorb free asphalt in the mixture when being added in a proper amount. With the continuous increase of traffic load, the single-doped polyester fiber can not meet the cracking resistance of the pavement layers of high-grade pavements and heavy-load steel bridge decks. In recent years, related researches show that the singly doped basalt fiber has a retarding effect on the generation and the propagation of cracks of the epoxy asphalt mixture, and the pavement performance of the epoxy asphalt mixture can be further improved on the basis of the singly doped fiber by carrying out fiber compound doping on the mixture in view of the performance difference among different fibers.
At present, the main test methods for evaluating the toughness of the epoxy asphalt mixture comprise a low-temperature trabecular bending test, an indirect tensile asphalt cracking test, a semicircular bending test and the like. While the chosen method can effectively distinguish toughening effects in multiple modes, it is difficult to track and describe the toughness of the mix.
Disclosure of Invention
The invention aims to provide a method for evaluating the toughness of a basalt fiber cold-mixed epoxy SMA-10 mixture, which can improve the high-temperature stability, the crack resistance and the fatigue resistance of the mixture by doping short basalt fibers and short polyester fibers into the SMA-10 mixture in proportion, and greatly improve the comprehensive performance of the mixture compared with the method of doping one fiber singly. And the real displacement and strain distribution on the surface of the mixture are accurately captured by combining DIC technology, and the toughness of the basalt fiber cold-mix epoxy SMA-10 mixture is evaluated by calculating the real-time crack propagation length of the test piece.
The purpose of the invention is realized by the following technical scheme: a method for evaluating the toughness of a basalt fiber cold-mixed epoxy SMA-10 mixture comprises the following steps:
step 1: molding a basalt fiber cold-mixed epoxy SMA-10 mixture test piece by adopting a wheel rolling method, and cutting and processing the test piece; step 2: performing LTTB test, and shooting the cut test piece in real time to obtain a mixture slice image;
and 3, step 3: and extracting image characteristic parameters based on the slice images, calculating related indexes, and evaluating the toughness of the mixture based on DIC technology.
Further, a basalt fiber cold-mix epoxy SMA-10 mixture test piece with the size of 300mm multiplied by 50mm is formed by a wheel milling method, then a cutting machine is adopted to cut the test piece, and the quadrangular prism test piece with the size of 250mm multiplied by 30mm multiplied by 35mm is obtained after the test piece is cut.
Further, a basalt fiber cold-mixed epoxy SMA-10 mixture test piece is formed by a wheel milling method, the test piece is cut, the polished surface is sprayed with black paint, and the black paint is kept stand for 15min to spray white paint.
Further, the basalt fiber cold-mixed epoxy SMA-10 mixture comprises the following components in percentage by mass: 6.15 to 6.54 percent of cold-mixed epoxy asphalt, 0.286 to 0.346 percent of fiber and 93.11 to 93.56 percent of mineral aggregate.
Furthermore, the mineral aggregate comprises mineral powder and coarse and fine aggregates, wherein the mineral powder accounts for 11% of the total mass of the mineral aggregate, and the 1# material, the 2# material, the 3# material and the 4# material in the coarse and fine aggregates respectively account for 3%, 53%, 11% and 22% of the total mass of the mineral aggregate.
Furthermore, the fibers comprise chopped basalt fibers and chopped polyester fibers, the length of each fiber is 6mm, the diameter of each fiber is 7 microns, and the mass ratio of the basalt fibers to the polyester fibers is 2.
Furthermore, the basalt fiber cold-mixed epoxy SMA-10 mixture is prepared by the following steps:
(1) Preheating coarse and fine aggregates and mineral powder at 105 +/-5 ℃ for more than 5 hours, taking out the coarse and fine aggregates and mineral powder, and cooling to room temperature;
(3) And adding the cooled coarse and fine aggregate into a mixing pot, adding fibers, uniformly mixing for 90s, adding cold-mixed epoxy asphalt, uniformly mixing for 90s, and finally adding mineral powder, uniformly mixing for 90s to prepare the basalt fiber cold-mixed epoxy SMA-10 mixture. Further, an UTM-25 machine is adopted to carry out LTTB test on the cut test piece, and a high-speed camera is used for recording the cracking process of the test piece until the test piece is completely broken.
Further, an Ncor program in Matlab software is used for analyzing, image characteristic parameters are extracted, calculation of related indexes is carried out, and calculation results of displacement and strain of the test piece are checked: u, V, strain E xx Strain E yy And strain E xy And evaluating the toughness of the basalt fiber cold-mixed epoxy SMA-10 mixture by calculating the real-time crack propagation length of the test piece, wherein the calculation formula of the real-time crack propagation length L is as follows:
Figure BDA0003802319710000031
in the formula: x is a radical of a fluorine atom i+1 ，y i+1 Respectively the horizontal real-time tip coordinate and the vertical real-time tip coordinate of the i +1 slice images; x is a radical of a fluorine atom i ，y i Respectively the horizontal real-time tip coordinate and the vertical real-time tip coordinate of the i slice images; delta refers to the slice image sizeA conversion factor of the pixel; n refers to the number of slice images.
Compared with the prior art, the invention has the following advantages:
(1) The basalt fiber cold-mixed epoxy SMA-10 mixture can effectively improve the high-temperature stability, crack resistance and fatigue resistance of the mixture, can effectively reduce the emission of asphalt smoke and carbon dioxide in mixing, transportation and construction, and can further accelerate the national carbon peak-reaching and carbon neutralization processes;
(2) The chopped basalt fibers and the chopped polyester fibers are doped into the SMA-10 mixture according to the mass ratio of 2, so that the advantages of the two fibers can be fully exerted, the comprehensive performance of the SMA-10 mixture is obviously improved compared with the single doping of one fiber, and the SMA-10 mixture has important social significance and economic benefit.
(3) The LTTB test piece manufactured by indoor tests is used for analysis, and the toughness of the basalt fiber cold-mix epoxy SMA-10 mixture can be effectively reflected on the basis of DIC technology. The method has the advantages of short testing time, simplicity in operation and high precision, and provides a new method and parameters for crack resistance research of pavement layers of high-grade pavements and heavy-load steel bridge decks.
Drawings
FIG. 1 is a flow chart of the method for evaluating the toughness of the basalt fiber cold-mix epoxy SMA-10 mixture.
FIG. 2 is a schematic diagram of image data information acquisition of the basalt fiber cold-mix epoxy SMA-10 mixture.
In the figure: the test device comprises a semicircular test piece 1, a high-speed camera 2, an image acquisition system 3, an image analysis system 4 and a load control system 5.
Detailed Description
The method for evaluating the toughness of the basalt fiber cold-mix epoxy SMA-10 mixture is further described with reference to fig. 1 and fig. 2 and specific embodiments.
DIC technology has advantages such as non-contact, commonality, robustness and ease of use, has well solved the defect of prior art, can track displacement and the strain of full field, and discerns the change situation in whole process. Therefore, DIC technology is a reasonable method for evaluating the toughness of epoxy asphalt mixtures.
The selected cold-mixed epoxy asphalt is high-toughness cold-mixed epoxy asphalt developed by Jiangsu Zhonglu engineering technology limited, the basalt fiber is chopped basalt fiber with the length of 6mm and the diameter of 7 mu m produced by Jiangsu Tianlong basalt continuous fiber component limited, and the polyester fiber is chopped polyester fiber with the length of 6mm and the diameter of 7 mu m produced by Hunan Changshuangxiang building materials limited.
Example 1
Heating 11173.2g of mineral aggregates (wherein the mass of the 1# material, the 2# material, the 3# material and the 4# material and the mass of the mineral powder are 335.20, 5921.80, 1229.05, 2458.10 and 1229.05 respectively) for more than 5 hours at 105 +/-5 ℃, taking out the aggregates and the mineral powder, and cooling for one day until the temperature reaches the room temperature. And adding the cooled coarse and fine aggregate into a mixing pot, uniformly mixing the cooled coarse and fine aggregate with 11.44g of chopped polyester fibers and 22.88g of chopped basalt fibers in the mixing pot for 90s, then adding 738.00g of cold-mixed epoxy asphalt, uniformly mixing for 90s, finally adding 1229.05g of mineral powder, and uniformly mixing for 90s to prepare the basalt fiber cold-mixed epoxy SMA-10 mixture.
Example 2
11227.2g of mineral aggregates (wherein the mass of the 1# material, the 2# material, the 3# material and the 4# material and the mass of the mineral powder are 336.82, 5950.42, 1234.99, 2469.98 and 1234.99 respectively) are preheated for more than 5 hours at the temperature of 105 +/-5 ℃, and the aggregates and the mineral powder are taken out and cooled for one day till the room temperature. And adding the cooled coarse and fine aggregate into a stirring pot, uniformly stirring the cooled coarse and fine aggregate with 13.84g of chopped polyester fibers and 27.68g of chopped basalt fibers for 90s in the stirring pot, then adding 784.80g of cold-mixed epoxy asphalt, uniformly stirring for 90s, finally adding 1234.99g of mineral powder, and uniformly stirring for 90s to prepare the basalt fiber cold-mixed epoxy SMA-10 mixture.
Example 3
11200.2g of mineral aggregates (1 # material, 2# material, 3# material and 4# material, the mass of the mineral powder is 336.01, 5936.11, 1232.02, 2464.04 and 1232.02 respectively) are preheated for more than 5 hours at the temperature of 105 +/-5 ℃, and the aggregates and the mineral powder are taken out and cooled for one day till the room temperature. And adding the cooled coarse and fine aggregate into a mixing pot, uniformly mixing the cooled coarse and fine aggregate with 12.64g of chopped polyester fibers and 25.28g of chopped basalt fibers in the mixing pot for 90s, then adding 761.40g of cold-mixed epoxy asphalt, uniformly mixing for 90s, finally adding 1232.02g of mineral powder, and uniformly mixing for 90s to prepare the basalt fiber cold-mixed epoxy SMA-10 mixture.
Comparative example 1
11200.2g of mineral aggregates (1 # material, 2# material, 3# material and 4# material, the mass of the mineral powder is 336.00, 5936.10, 1232.04, 2464.04 and 1232.02 respectively) are preheated for more than 5 hours at the temperature of 105 +/-5 ℃, and the aggregates and the mineral powder are taken out and cooled for one day till the room temperature. And adding the cooled coarse and fine aggregate into a mixing pot, uniformly mixing the cooled coarse and fine aggregate with 25.15g of chopped polyester fibers and 12.58g of chopped basalt fibers in the mixing pot for 90s, then adding 761.40g of cold-mixed epoxy asphalt, uniformly mixing for 90s, finally adding 1232.02g of mineral powder, and uniformly mixing for 90s to prepare the basalt fiber cold-mixed epoxy SMA-10 mixture.
Comparative example 2
11088.2g of mineral aggregates (wherein the mass of the 1# material, the 2# material, the 3# material and the 4# material and the mass of the mineral powder are 332.65, 5876.74, 1219.70, 2439.41 and 1219.70 respectively) are preheated for more than 5 hours at the temperature of 105 +/-5 ℃, and the aggregates and the mineral powder are taken out and cooled for one day until the temperature reaches the room temperature. And adding the cooled coarse and fine aggregate into a stirring pot, uniformly stirring the cooled coarse and fine aggregate and 37.54g of short-cut polyester fiber for 90s in the stirring pot, then adding 753.79g of cold-mixed epoxy asphalt for uniformly stirring for 90s, finally adding 1219.70g of mineral powder and uniformly stirring for 90s, and preparing the cold-mixed epoxy SMA-10 mixture.
Comparative example 3
Pre-heating 11312.2g of mineral aggregates (wherein the mass of the 1# material, the 2# material, the 3# material and the 4# material and the mass of the mineral powder are 339.37, 5995.47, 1244.34, 2488.68 and 1244.34 respectively) for more than 5 hours at the temperature of 105 +/-5 ℃, and taking out the aggregates and the mineral powder to cool for one day until the temperature reaches the room temperature. And adding the cooled coarse and fine aggregate into a mixing pot, uniformly mixing the cooled coarse and fine aggregate with 37.92g of chopped basalt fibers in the mixing pot for 90s, then adding 769.01g of cold-mixed epoxy asphalt, uniformly mixing for 90s, finally adding 1244.34g of mineral powder, and uniformly mixing for 90s to prepare the basalt fiber cold-mixed epoxy SMA-10 mixture.
And carrying out road performance test and toughness evaluation on the basalt fiber cold-mixed epoxy SMA-10 mixture prepared in each embodiment and comparative example.
The toughness evaluation of the basalt fiber cold-mixed epoxy SMA-10 mixture prepared by the invention is carried out, the process is shown as figure 1, and the method specifically comprises the following steps:
step 1: a basalt fiber cold-mixed epoxy SMA-10 mixture test piece with the size of 300mm multiplied by 50mm is formed by a wheel milling method. Cutting asphalt mixture test pieces by a high-precision double-faced saw or a small-sized cutting machine, cutting 6 quadrangular prism test pieces with the size of 250mm multiplied by 30mm multiplied by 35mm, spraying black paint on the polished surface of the formed test pieces, standing for 15min and spraying white paint;
and 2, step: the test instrument adopts a UTM-25 machine, a quadrangular prism test piece is placed in a symmetrical direction relative to the supporting steel roller, is vertical to the placed supporting steel roller and is vertical to a horizontal plane, and applied force vertically penetrates through the center of the test piece. The temperature in the instrument was adjusted to-10 ℃ for the LTTB test. Meanwhile, a high-speed camera is used for recording the cracking process of the test piece until the test piece is completely broken so as to obtain a mixed material slice image, and a schematic image of image data information acquisition is shown in fig. 2.
And step 3: and (3) analyzing by using a Ncor program in Matlab software based on the slice image in the step (2), and solving a real-time orthogonal displacement field in the ROI area of the crack tip in the fracture process of the composite material. Firstly, inputting a code: handles ncorr ～ ncorr, inputting a reference image and a current image, setting a target area of the image, setting DIC parameters and a nucleus position, extracting image characteristic parameters, calculating related indexes, and converting displacement data into strain data by using a Cauchy equation. Viewing the displacement and strain calculation results of the test piece: u, V, strain E xx Strain E yy And strain E xy And evaluating the toughness of the basalt fiber cold-mixed epoxy SMA-10 mixture by calculating the real-time crack propagation length of the test piece.
Taking a horizontal displacement cloud chart as an example, the calculation formula of the real-time crack propagation length L is as follows:
Figure BDA0003802319710000051
the grey correlation analysis aims at researching the strength of the influence of various factors on each index, and the importance of all the factors is ranked by a matrix calculation arrangement method. And (3) optimally selecting the road performance and the real-time crack propagation length result of the basalt fiber cold-mixed epoxy SMA-10 mixture by adopting a grey correlation analysis method, and determining the optimal complex doping proportion. Firstly, a mixture prepared in examples 1-3 and comparative examples 1-3 is constructed into a scheme set, a constructed matrix is subjected to normalized matrix, then weight determination is carried out, and finally optimization selection is carried out.
TABLE 1 road Performance and toughness results
Figure BDA0003802319710000061
The invention discloses a method for evaluating the toughness of a basalt fiber cold-mixed epoxy SMA-10 mixture, which comprises the following components in percentage by mass, 6.15-6.54% of cold-mixed epoxy asphalt, 0.286-0.346% of fiber and 93.11-93.56% of mineral aggregate. Compared with the existing preparation technology of the single-doped fiber mixture, the chopped basalt fiber and the chopped polyester fiber are uniformly mixed and doped into the mixture according to the mass proportion, so that the following effects are realized: the effect of high oil absorption rate of the polyester fiber is fully found, the excessive free asphalt in the cold-mixed epoxy SMA-10 mixture is adsorbed, and the adhesiveness of the asphalt cement is effectively increased, so that the water stability of the mixture is improved. The basalt fiber has the effects of reinforcing and toughening in the cold-mixed epoxy SMA-10 mixture, can obviously improve the high-temperature anti-rutting capability of the mixture, and greatly enhances the anti-fatigue cracking capability of the mixture. And evaluating the toughness of the basalt fiber cold-mixed epoxy SMA-10 mixture by combining LTTB test with DIC technology. The performance of the asphalt mixture is comprehensively evaluated by adopting a grey correlation degree analysis method, and the overall performance of the cold-mixed epoxy SMA-10 mixture which is formed by compounding the chopped basalt fibers and the polyester fibers according to the mass ratio of 2.
It should be noted that the above-mentioned embodiments are preferred embodiments of the present invention, and the present invention is not limited in any way. Although the present invention has been described with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes, modifications, substitutions, combinations and simplifications may be made without departing from the scope of the invention.

Claims (8)

1. The method for evaluating the toughness of the basalt fiber cold-mixed epoxy SMA-10 mixture is characterized by comprising the following steps of:
step 1: molding a basalt fiber cold-mixed epoxy SMA-10 mixture test piece by adopting a wheel rolling method, and cutting and processing the test piece;
and 2, step: performing LTTB test, and shooting the cut test piece in real time to obtain a mixture slice image;
and step 3: and extracting image characteristic parameters based on the slice images, calculating related indexes, and evaluating the toughness of the mixture based on DIC technology.
2. The method according to claim 1, wherein the basalt fiber cold mix epoxy SMA-10 mixture test piece having a size of 300mm x 50mm is formed by a wheel milling method, and then the test piece is cut by a cutter to obtain a quadrangular prism test piece having a size of 250mm x 30mm x 35 mm.
3. The method of claim 1, wherein the basalt fiber cold mix epoxy SMA-10 mixture test piece is formed by a wheel rolling method, the test piece is cut, the polished surface is sprayed with black paint, and the black paint is left standing for 15min to spray white paint.
4. The method of claim 1, wherein the basalt fiber cold mix epoxy SMA-10 mixture comprises the following components in percentage by mass: 6.15 to 6.54 percent of cold-mixed epoxy asphalt, 0.286 to 0.346 percent of fiber and 93.11 to 93.56 percent of mineral aggregate.
5. The method of claim 4, wherein the mineral aggregate comprises 11% mineral fines by mass of the total mineral aggregate, and the 1# feed, 2# feed, 3# feed, and 4# feed of the coarse and fine aggregate comprise 3%, 53%, 11%, and 22% of the total mineral aggregate, respectively.
6. The method of claim 4, wherein the fibers comprise chopped basalt fibers and chopped polyester fibers, the fibers each have a length of 6mm and a diameter of 7 μm, and the mass ratio of the basalt fibers to the polyester fibers is 2.
7. The method of claim 1 or 4, wherein the basalt fiber cold mix epoxy SMA-10 compound is prepared by the steps of:
(1) Preheating coarse and fine aggregates and mineral powder at 105 +/-5 ℃ for more than 5 hours, taking out the coarse and fine aggregates and mineral powder, and cooling to room temperature;
(3) And adding the cooled coarse and fine aggregate into a mixing pot, adding fibers, uniformly mixing for 90s, adding cold-mixed epoxy asphalt, uniformly mixing for 90s, adding mineral powder, and uniformly mixing for 90s to prepare the basalt fiber cold-mixed epoxy SMA-10 mixture. Further, an UTM-25 machine is adopted to carry out LTTB test on the cut test piece, and a high-speed camera is used for recording the cracking process of the test piece until the test piece is completely broken.
8. The method of claim 1, wherein the image feature parameters are extracted and the correlation indices are calculated using the Ncorr program in Matlab software to look up the displacement and strain calculation results of the test piece: u, V, strain E xx Strain E yy And strain E xy Evaluating the toughness of the basalt fiber cold-mixed epoxy SMA-10 mixture by calculating the real-time crack propagation length of the test pieceThe formula for L is as follows:
Figure FDA0003802319700000021
in the formula: x is the number of i+1 ，y i+1 Respectively the horizontal real-time tip coordinate and the vertical real-time tip coordinate of the i +1 slice images; x is a radical of a fluorine atom i ，y i Respectively the horizontal real-time tip coordinate and the vertical real-time tip coordinate of the i slice images; δ refers to the conversion coefficient of the slice image size pixel; n refers to the number of slice images; δ refers to the conversion coefficient of the slice image size pixel; n refers to the number of slice images.
CN202210987286.1A 2022-08-17 2022-08-17 Method for evaluating toughness of basalt fiber cold-mixed epoxy SMA-10 mixture Pending CN115372123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210987286.1A CN115372123A (en) 2022-08-17 2022-08-17 Method for evaluating toughness of basalt fiber cold-mixed epoxy SMA-10 mixture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210987286.1A CN115372123A (en) 2022-08-17 2022-08-17 Method for evaluating toughness of basalt fiber cold-mixed epoxy SMA-10 mixture

Publications (1)

Publication Number Publication Date
CN115372123A true CN115372123A (en) 2022-11-22

Family

ID=84065226

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210987286.1A Pending CN115372123A (en) 2022-08-17 2022-08-17 Method for evaluating toughness of basalt fiber cold-mixed epoxy SMA-10 mixture

Country Status (1)

Country Link
CN (1) CN115372123A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116819054A (en) * 2023-06-13 2023-09-29 扬州大学 Method for determining complex blending proportion of asphalt mixture fibers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116819054A (en) * 2023-06-13 2023-09-29 扬州大学 Method for determining complex blending proportion of asphalt mixture fibers

Similar Documents

Publication Publication Date Title
Cui et al. Morphological characteristics of aggregates and their influence on the performance of asphalt mixture
Fang et al. Aggregate gradation theory, design and its impact on asphalt pavement performance: a review
Stewart et al. Effect of specimen thickness on the fracture resistance of hot mix asphalt in the disk-shaped compact tension (DCT) configuration
Judycki et al. Investigation of low-temperature cracking in newly constructed high-modulus asphalt concrete base course of a motorway pavement
CN115372123A (en) Method for evaluating toughness of basalt fiber cold-mixed epoxy SMA-10 mixture
CN106242378A (en) Hot in-plant reclaimed asphalt mixture and preparation method thereof
CN113024161B (en) Mix proportion design method of plant-mixed hot recycled asphalt mixture
Cheng et al. Effect of waste glass aggregate on performance of asphalt micro-surfacing
Wang et al. Effect of different coarse aggregate surface morphologies on cement emulsified asphalt adhesion
Mehdinejad et al. Comparison of two criteria of stress intensity factor and fracture energy to investigate the behavior of asphalt mixtures under combined tensile-shear loading modes-A statistical approach
Tang et al. Effect of 3D roughness characteristics on bonding behaviors between concrete substrate and asphalt overlay
Garcia et al. Assessing crack susceptibility of asphalt concrete mixtures with overlay tester
Xu et al. Application of fog-seal technology with waterborne thermosetting additive in asphalt pavement
Jin et al. Investigation of interlayer bonding performance between asphalt concrete overlay and Portland cement concrete using inclined shear fatigue test
Liang et al. Use of digital images for fracture performance evaluation of asphalt mixtures
He et al. Characterization of Interlayer Bonding Mechanism Based on Interface Morphology in Double-Layered Asphalt Systems
CN104003656B (en) A kind of SMA mixture and its preparation method and application
Song et al. Low-temperature crack resistance of basalt fiber-reinforced phase-change asphalt mixture based on digital-image correlation technology
Zarei et al. Fracture behavior of semiflexible pavement containing cement asphalt emulsion paste
Luo et al. Effects of dioctyl phthalate on performance of asphalt sealant
Ji et al. Properties of direct coal liquefaction residue modified asphalt mixture
Kanellopoulos et al. Mechanical and fracture properties of cement-based bi-materials after thermal cycling
Peng et al. Application of statistical methods in evaluating asphalt mixture homogeneity
Jiang et al. Preparation Process and Performance of Polyurethane-Modified Bitumen for Ultrathin Asphalt Layers
Zofka et al. Laboratory study on the influence of casting on properties of ultra-high performance fibre reinforced concrete (UHPFRC) specimens

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination