229 results about "Compressive strength test" patented technology

The invention discloses a wharf armor block quality detection method, and belongs to the technical field of concrete structure detection.The method comprises the steps that a surface model is constructed through a movable three-dimensional laser scanning device, and a high-risk defect area is recognized; performing encryption scanning and impact echo detection in the high-risk area by adopting a frequency-adjustable dual-mode flaw detection device to generate a three-dimensional defect distribution diagram; a core sample is drilled in the defect area for compressive strength testing, and the material performance is analyzed in combination with a non-contact infrared spectrum; and establishing a dynamic evaluation model, calculating a safety coefficient by integrating surface defects, internal defects and material discreteness data, and generating a three-dimensional visual report. The problems that a traditional detection method is low in efficiency, insufficient in internal defect positioning precision, one-sided in material performance evaluation and the like are solved, full-dimensional detection from the surface to the interior and from the macroscopic level to the microscopic level is achieved through a multi-source data fusion and closed-loop feedback mechanism, and the reliability of structural safety evaluation and the scientificity of maintenance decision are remarkably improved.

The invention relates to the technical field of concrete quality control, in particular to a concrete strength prediction system and method based on SVR. According to the invention, multi-dimensional data of rebound test, compressive strength test and carbonization depth value measurement are collected through the data acquisition module, rich input characteristics are provided for the model, and the prediction capability of the model is enhanced; and abnormal data is eliminated by adopting a Grubbs criterion, so that the quality and consistency of input data are ensured, and the influence of noise on model training is reduced. According to the method, a concrete rebound curved surface regression equation and a support vector regression model are established respectively and serve as prediction criteria, data fusion is carried out through a Kalman filter, and the prediction precision and reliability are further improved. Through automatic and standardized data processing procedures including data acquisition, preprocessing, regression prediction, SVR prediction, data fusion and the like, rapid prediction of the concrete strength is realized, and the prediction efficiency is improved.

The invention discloses a steel slag improved marine facies sludge curing agent proportion determination method based on a response surface method, which comprises the following steps: carrying out a shear strength test on waste steel slag improved marine dredged sludge under a freezing and thawing cycle, and determining the optimal curing agent mixing amount of the marine dredged sludge; performing an unconfined compressive strength test based on the optimal mixing amount of the curing agent of the marine dredged sludge to obtain the optimal mixing amount range of each component of the curing agent; testing by taking the mixing amount of each component of the curing agent as a main variable and taking 7d compressive strength and 14d compressive strength as response amounts to obtain response value test results under different mixing ratios; performing nonlinear fitting on a response value test result, and establishing a response surface model; obtaining an expected value of each response quantity based on the response surface model; and obtaining the optimal mix proportion of the curing agent based on the expected value of each response amount. Under the condition of considering each index, the optimal mix proportion is found, and the overall performance and the construction effect are improved.

The invention discloses a polystyrene plastic plate compression resistance testing device and method for refrigerator liner production, and relates to the technical field of refrigerator liner production. The device comprises a testing machine and a plastic plate, and further comprises a positioning unit which comprises a positioning assembly and a moving assembly; the pressure control hydraulic cylinder is arranged on the testing machine; the pressure applying testing unit comprises an adjusting assembly and a testing assembly, the adjusting assembly is used for adjusting the size of the pressed face of the plastic plate to achieve multi-area pressure applying, and the testing assembly is used for detecting and judging the testing result. The device has the advantages that the size of the compression surface of the plastic plate can be flexibly changed when the compression resistance of the polystyrene plastic plate is detected, the compression resistance of the plastic plate under different compression surfaces can be tested, the stress position of the plastic plate can be flexibly changed, the plastic plate cannot be damaged during testing, multi-position testing can be realized on the same plastic plate, and the testing efficiency is improved. The number of test samples is larger, and the test result is more accurate.

The invention discloses a precursor alkali-activated reaction activity prediction method based on physicochemical properties and molecular simulation. The method comprises the following steps: acquiring physicochemical properties of a plurality of different alkali-activated precursor materials; acquiring molecular dynamics parameters of the precursor materials under the corresponding physicochemical properties; obtaining the strength activity index of each precursor material through a traditional unconfined compressive strength test; sequencing the physicochemical properties and the molecular dynamics parameters according to the significant degree of the influence on the strength activity index of the precursor material, rejecting non-significant parameters, and retaining significant influence parameters; and based on the corresponding relationship between the significant influence parameter and the strength activity index of each precursor material, establishing a precursor alkali-activated reaction activity index pre-estimation model taking the significant influence parameter as a variable by combining multiple linear regression with an artificial neural network algorithm. According to the method, the accuracy is ensured, and meanwhile, the alkali excitation reaction activity of the precursor material is rapidly predicted.

The invention relates to the technical field of geotechnical engineering material modification and industrial solid waste resource utilization, in particular to an industrial solid waste curing agent formula screening method for salinized loess improvement, which comprises the following steps: constructing a curing system with different industrial solid waste (such as fly ash, slag and steel slag) composite proportions, identifying the salt type and salt concentration of salinized loess, and determining the salt concentration of the salinized loess. The method comprises the following steps: preparing, maintaining and curing a sample, carrying out unconfined compressive strength test and X-ray diffraction (XRD) analysis, extracting peak areas of main reaction products, and calculating a structure-performance coupling mechanism index Mi = S / f7 (S is the XRD peak area, and f7 is the compressive strength of 7 days). The Mi value and the 28-day strength are used as judgment criteria, and a preferable formula with good structural product master control and strength development is screened out. The screening method provided by the invention has the advantages of distinguishable mechanism, quantifiable index, generalizable process and the like, and is suitable for formula design and engineering application of the industrial solid waste-based curing agent under the conditions of different salt concentrations and ion types.

The invention belongs to the technical field of concrete testing, and particularly provides mechanical property testing equipment and a detection method for recycled aggregate concrete. The mechanical property testing equipment for the recycled aggregate concrete comprises a machine body, a reversing unit, a pressure testing unit and two tension testing units, the pressure testing unit is arranged in the vertical direction, and the two tension testing units are arranged in the horizontal direction and do not interfere with each other in spatial position. The reversing unit can clamp a test piece and drive the test piece to move between the vertical direction and the horizontal direction, the placement state of the recycled aggregate concrete test piece is switched and changed in real time, and the flexibility of the equipment during mechanical property testing is improved; the recycled aggregate concrete test piece can meet the requirements of two different test items of compressive strength test and tensile strength test.

The invention relates to a method for detecting the strength of ultra-high performance concrete through a core drilling method with the diameter of 52 mm. The method comprises the following steps that S1, steel bar distribution is detected on a to-be-detected ultra-high performance concrete member through a steel bar detector, and a steel bar distribution grid is drawn; s2, core samples with the diameter of 52 mm are drilled in the grids; s3, after processing the core sample, carrying out a compressive strength test to obtain a compressive strength value of the core sample; and S4, presuming the structural concrete strength by utilizing a correction coefficient formula according to the compressive strength value of the ultra-high performance concrete core sample. According to the method, the optimal core sample size of UHPC sampling is obtained through a contrast test, a correction coefficient formula suitable for the UHPC optimal core sample is obtained according to test data, the obtained optimal core sample size meets the standard requirements, damage to the UHPC component is minimum, and the strength of the UHPC component can be obtained.

The invention discloses a cement mortar test piece strength automatic test system and an automatic test method, and belongs to the technical field of cement mortar test piece fracture resistance and compression resistance tests, the cement mortar test piece strength automatic test system comprises a test piece storage device, a fracture resistance testing machine, a compression resistance testing machine, a fracture resistance cleaning mechanism, a compression resistance cleaning mechanism, a mechanical arm and an upper computer; the mechanical arm can grab the cement mortar test piece on the test piece storage device according to a preset program and place the cement mortar test piece on an objective table of the anti-bending testing machine for carrying out an anti-bending strength test, and the mechanical arm can also grab the cement mortar test piece which is folded into two sections after the anti-bending strength test is completed to the anti-compression testing machine for carrying out a compressive strength test; the upper computer is in signal connection with the anti-bending testing machine and the anti-compression testing machine, and can record the anti-bending strength and compressive strength data of the cement mortar test piece. The full-automatic operation for testing the fracture resistance and the compressive strength of the cement mortar test piece is realized, the productivity is improved, and the problem that the accuracy of a test result is influenced by traditional manual operation is avoided.

The invention discloses a performance detection method and system for ultra-high performance concrete, particularly relates to the technical field of building material performance detection, and aims to solve the problem of strength test discreteness caused by neglecting of an aging effect after high-temperature maintenance in an existing detection method. The method comprises the following steps: recording a first time point when a test piece is cooled at room temperature and a second time point when a press machine is loaded, and generating a comprehensive aging factor in combination with double quantitative analysis of a fiber pull-out fragment proportion and a crack fractal dimension in a damage process image; matching a strength correction coefficient from a preset table according to the aging factor, and dynamically calibrating a first compressive strength test result; accurate association between the aging damage mechanism and the macroscopic strength is achieved, and the reliability evaluation precision of the ultra-high performance concrete in major engineering is remarkably improved.

The invention discloses a recycled aggregate cement stabilized macadam subbase design method based on grading recombination, which comprises the following steps: improving aggregate crushing technical parameters based on evaluation and verification indexes of working performance, collecting recycled aggregates in grades, and judging whether the recycled aggregates meet the specified requirements of technical specifications for construction of a cement stabilized macadam subbase or not; screening regenerated aggregates meeting the specified requirements; screening the regenerated aggregate and the primary aggregate by adopting a water washing method, and synthesizing an initial target grading of the regenerated aggregate according to upper and lower limit ranges of each grade of aggregate suggested by specifications, so as to obtain a regenerated aggregate cement stabilized macadam mixture; and performing a heavy compaction test and a 7d unconfined compressive strength test, determining the mix proportion of the regenerated aggregate cement stabilized macadam subbase based on a test result, and obtaining the cement dosage required by design according to the mix proportion. According to the method, by proposing the parting crushing coefficient, the recombination gradation of the recycled aggregate can be predicted, and the problem of long time consumption of crushing and re-screening in site construction is solved.

The invention discloses a concrete depth performance detection method, and relates to the technical field of concrete performance detection.The device comprises a shell, a top cover, a combined pressurizing mechanism, a combined supporting mechanism, a water inlet pipe, a camera, a controller and a high-pressure water supply device; the method comprises a compressive strength test mode, a permeability resistance test mode and a test piece permeability detection mode after different pressure loads. Through the design, observation and research on permeability change of the test piece after loading can be realized, and data reference is provided for actual engineering. Meanwhile, the device disclosed by the invention can be used for carrying out compressive strength test and permeability resistance test, so that the applicability of the device is effectively improved, the application range is widened, and convenience is provided for in-depth research of concrete performance.

The invention relates to a deep learning springback and audio-based rock compressive strength determination method. The method comprises the following steps: S1, collecting rock springback, springback instrument striking audio recording and rock uniaxial compressive strength test results through a large sample test; s2, carrying out data processing on the collected rock springback data and the springback striking audio set; s3, establishing a neural network calculation model based on the collected rock springback value, the characteristic value of the springback striking audio spectrum and the corresponding data of the uniaxial compressive strength of the rock; and S4, by collecting a rock rebound value and a characteristic value of a rebound strike audio spectrum, based on the established neural network calculation model, substituting the rock rebound value and the characteristic value of the rebound strike audio spectrum obtained by testing into the prediction model, and calculating the rock uniaxial compressive strength of the rock. The method performs deep learning training to obtain information and summarizes rules to establish the rock strength prediction model, and is suitable for various types of rocks.

The invention relates to the technical field of compressive strength detection equipment, in particular to aluminum profile compressive strength detection equipment which comprises a base, an inverted-U-shaped plate is connected to the top of the base, an electric clamp used for clamping and fixing an aluminum profile is arranged at the top of the base, and a display mechanism used for displaying the deformation sunken depth of the aluminum profile is arranged on the inverted-U-shaped plate. After the deformation sunken position of the aluminum profile extruded by the pressing block is aligned with the U-shaped push plate, the U-shaped push plate can be pushed under the action of the spring I to pull the piston rod to move downwards through the push-pull plate, so that the colored liquid in the measuring cylinder is pumped into the cylinder body through the liquid conveying pipe, and the liquid level variation of the colored liquid in the measuring cylinder is the deformation sunken depth of the extruded aluminum profile; the deformation sunken depth of the aluminum profile can be visually displayed through the scales on the measuring cylinder, so that the intuition and the convenience of the compressive strength detection of the aluminum profile are greatly improved, and the detection precision can be improved.

The invention discloses a concrete member compressive strength test device and test method, and relates to the technical field of road test equipment. The concrete member compressive strength test device comprises a stand column, a pressure applying assembly, a pressure bearing assembly and an adaptive assembly, the adaptive assembly comprises a first sleeve, a second sleeve and a supporting unit; the supporting unit can slide longitudinally; the first sleeve is used for limiting the first sandy soil layer; the second sleeve is used for limiting the second sandy soil layer. The supporting unit temporarily supports the first sleeve, so that the first containing cavity is formed, a user can free hands to grab sandy soil and fill the sandy soil into the first containing cavity, single-person operation is achieved, the test efficiency is improved, and the labor cost is reduced. When the pressure applying assembly moves downwards and applies pressure to the cylindrical component, the supporting unit and the first sleeve are in a separated state, and the problem that friction force between stand columns of the supporting unit has adverse effects on final test data can be avoided.

The invention discloses a mixing design-based ratio optimization method for a multi-source solid waste cementing material containing alkaline residues, which is used for optimizing to obtain an optimal ratio of five solid waste components according to a preset cementing material performance target, the alkaline residues are used as an alkaline excitation component, a D optimal mixing design method is adopted to determine a test point, a three-order normative polynomial model is established, and the optimal ratio of the five solid waste components is obtained. Setting constraint conditions of each solid waste component, testing the three-day compressive strength and 28-day compressive strength of the neat paste for each test point, obtaining a first fitting model based on compressive strength response and a second fitting model based on response according to test data, and according to a preset performance target, the first fitting model and the second fitting model, calculating the compressive strength of the neat paste according to the first fitting model and the second fitting model. Solving through a multi-objective optimization algorithm to obtain an optimal proportion of five solid waste components; according to the method, the problems of low efficiency and high cost of a traditional trial and error method are solved, and scientization and standardization of the proportion design of the multi-source solid waste cementing material are realized.

The invention provides a strength detection device for mineral solid waste admixture concrete preparation, and relates to the technical field of concrete detection.The strength detection device comprises a base, four supports are fixedly connected to the side wall of the base, four supporting columns are fixedly connected to the upper surface of the base, an upper mounting plate is fixedly connected to the upper surfaces of the supporting columns, and a hydraulic cylinder is mounted on the upper surface of the upper mounting plate; the lower end of the hydraulic cylinder is provided with an output rod, the lower end of the output rod is provided with an experimental pressure head, the upper surface of the base is fixedly connected with an experimental box, a clamping assembly is arranged in the experimental box, and the upper end of the experimental box is slidably connected with two protective covers in the left-right direction. When a concrete compressive strength test is carried out, a concrete test block is put into the test box, and the four groups of clamping jaw assemblies synchronously move towards the center, so that the concrete test block is automatically centered and positioned, the installation stability of the concrete test block and the accuracy of the installation position are ensured, the accuracy of a loading position is ensured, and the accuracy of a test result is improved.

The invention belongs to the technical field of cables, and particularly relates to a power cable insulation performance rapid detection device and method.The power cable insulation performance rapid detection device comprises a base, a mounting plate is fixedly connected to the upper surface of the base, a transverse plate is fixedly connected to the outer wall of the mounting plate, and a plurality of conducting rods are fixedly connected to the side, away from the mounting plate, of the transverse plate; a mounting frame is fixedly connected to the upper surface of the base, a baffle is fixedly connected to the inner wall of the mounting frame, and a gear motor is fixedly connected to the outer wall of the mounting frame. The cable winding and unwinding device can detect an insulating layer of a cable in the cable winding and unwinding process, defects in the insulating layer can be effectively detected, meanwhile, compressive strength testing can be conducted on the cable, and the cable winding and unwinding device is high in practicability. According to the cable insulation layer detection device, potential insulation layer defects can be found easily, detection personnel can be helped to find some potential insulation layer defects or defects difficult to find directly, such as tiny holes, cracks or bubbles, of the insulation layer, and the detection efficiency of the cable insulation layer detection device is improved.

The invention discloses a 3D printing concrete quality regulation and control method, which comprises the following steps: S1, obtaining a plurality of same to-be-detected 3D printing concrete and component proportions, and flattening to form a cubic test piece; s2, obtaining the setting time of the concrete; s3, carrying out a penetration test on the solidified concrete to obtain the height of a water mark; s4, carrying out anti-erosion test on the solidified concrete to obtain the mass conversion amount and the volume conversion amount of the concrete; s5, testing the compressive strength of the solidified concrete to obtain crack occurrence time and crushing time; s6, changing the proportion of each component of the concrete, and repeating a plurality of groups of experiments to obtain detection values of the plurality of groups of experiments; s7, calculating values obtained by multiple groups of experiments to obtain an average value; and S8, comparing different detection values of different components with the average value to obtain the most suitable concrete. The stability of the performance of the concrete required by 3D printing is ensured, and the problems of cracks, water seepage and the like caused by improper mixing proportion are avoided.

The invention relates to the technical field of concrete performance testing, in particular to a high-strength pervious concrete strength testing device which comprises a pressure testing machine, a testing table is arranged on the left side of the pressure testing machine, and a fixing unit used for fixing a concrete test piece is arranged at the upper end of the testing table. A testing unit for testing the compressive strength and the breaking strength of the concrete test piece is arranged above the testing table. The fixing unit used by the invention can accurately and stably fix the concrete test piece at the upper end of the test table, accurately align and stably fix the cubic test piece and the cuboid test piece, ensure that the loading force uniformly acts on the surface of the test piece, and avoid stress concentration caused by position deviation or inclination of the test piece; therefore, the authenticity and reliability of the test result are ensured. According to the invention, the structure of the fixing unit can be flexibly adjusted to adapt to the compressive strength test of the cube test piece and the breaking strength test of the cuboid test piece, so that one machine has two purposes.

The invention provides a compressive strength testing device for an autoclaved aerated concrete block, and relates to the field of block strength testing, the compressive strength testing device comprises a testing assembly, the testing assembly is composed of a pressure applying mechanism and a transmission mechanism, when the testing assembly is used for testing the compressive strength of the block, the testing assembly has initial testing pressure, and when the testing assembly is used for testing the compressive strength of the block, the testing assembly is used for testing the compressive strength of the block; in other words, the pressure of the testing assembly does not start from zero during pressurization, so that the time consumed when a traditional press starts to conduct pressurization testing from zero is saved, testing is rapid, testing efficiency is high, the testing assembly has the protection function, and when the building blocks are broken, the testing assembly can be self-locked. The test assembly is prevented from being damaged due to elastic impact generated by losing the support of the building block, and the problems that the pressure exerted on the building block by the existing compressive strength test device of the aerated concrete building block always starts from zero, a certain time is needed to reach the required pressure value, the test efficiency is low, and the test cost is low especially when a large batch of building blocks are detected are solved. And the consumed time is long.

The invention belongs to the field of coal seam coal rock mechanical property testing, and particularly relates to an accurate fidelity testing method for three-resistance strength parameters of coal rock before heat injection and permeability increase. Comprising the following steps: S1, sample preparation; s2, testing equipment configuration; s3, environment control; testing in the testing cover, setting the temperature and humidity in the testing cover to be consistent with the original sample environment, setting the temperature fluctuation range to be less than or equal to + / -1 DEG C, and maintaining parameter stability through an automatic adjusting system; s4, testing compressive strength; loading at a constant speed of 0.5 MPa / s, recording a failure load and calculating compressive strength c = Fc / A; s5, tensile strength testing; stretching at the speed of 1MPa / s, recording the fracture load and calculating the tensile strength r = 2Fr / piDt; s6, testing the shear strength; loading shear force at a constant speed, recording a failure load and calculating shear strength; S7, analyzing data; and after abnormal values are removed, generating a strength parameter curve, and comparing mechanical property data in different stress states. The accurate fidelity testing method for the three-resistance strength parameters of the coal rock before coal seam heat injection and permeability increase has the advantages of being easy and convenient to operate, rapid in testing, accurate in data and the like.

The invention relates to the technical field of concrete strength detection, in particular to comprehensive concrete compressive strength detection equipment. Comprising a base and a top base supported by supporting columns on the upper surface of the base. A rotating groove is formed in the center of the upper surface of the base; a rotating disc is rotationally and hermetically connected into the rotating groove; the center of the lower surface of the turntable is driven by a first motor; a left detection seat and a right detection seat are symmetrically arranged on the upper surface of the base relative to the rotating groove; a left driven groove is formed in one surface, facing the center of the turntable, of the left detection seat; through inclined plane transmission between a left driving block and a left driven block in the left detection seat, a pressure head on a hydraulic cylinder can transmit force in the vertical direction to the horizontal direction, and through cooperation with rotation of a turntable, compression resistance detection of a concrete test block in three directions is realized, detection personnel do not need to turn over the concrete test block, and the detection efficiency is improved. The safety and the operation convenience of concrete compressive strength detection are greatly improved.

The invention relates to the technical field of concrete detection, in particular to a recycled concrete sample compressive strength testing device which is arranged to conveniently clamp and fix the center of a recycled concrete sample, so that the testing result of the recycled concrete sample is ensured. Comprising a workbench, a fixing frame, a strength testing device, a fine adjustment device and a clamp assembly, the fixing frame is installed at the top end of the workbench, the strength testing device is installed at the top of the fixing frame, and the fine adjustment device is installed at the top end of the workbench; the clamp assembly comprises a placing table, two first two-way screws, two clamping plates, four first sliding blocks, two second two-way screws, four clamping plates, four second sliding blocks, two belt wheels, a belt, a motor and a mounting frame, the placing table is connected with the fine adjustment device in a matched mode, and the four first sliding blocks are mounted on the front sides and the rear sides of the bottom ends of the two clamping plates correspondingly; the motor is mounted at the inner end of the mounting frame which is mounted on the right rear side of the bottom end of the placement table.

The invention discloses a strength prediction model construction method based on a solidified soil micro-pore structure, and relates to the technical field of dredged sludge solidification construction.The strength prediction model construction method based on the solidified soil micro-pore structure comprises the steps that sludge, rice hull ash and carbide slag are mixed according to a preset proportion, and a mixture is obtained; adding water into the mixture and curing to a preset age to obtain a cylindrical sample; performing unconfined compressive strength test on the cylindrical sample to obtain a damaged sample; cutting out a section center 5 mm * 5 mm area from the destroyed sample, and extracting the porosity; establishing a strength prediction model according to the mixing amount of the rice hull ash, the mixing amount of the carbide slag, the preset age and the porosity; according to the invention, the strength prediction model construction method based on the solidified soil micro-pore structure is established, so that the strength of the sludge solidified soil is predicted. Theoretical guidance and parameter optimization basis are provided for sludge solidification treatment engineering, and theoretical basis is provided for resource utilization of dredged sludge.

The invention provides a mortar compressive strength prediction model construction method based on a low-field magnetic resonance relaxation technology. The method comprises the following steps: 1, preparing a standard mortar test piece, and carrying out maintenance and water saturation treatment; 2, carrying out low-field magnetic resonance relaxation test analysis on the standard mortar test piece; 3, testing the compressive strength of the standard mortar test piece; 4, determining a relation model of the standard mortar test piece and the pore structure; according to the mortar compressive strength prediction method based on the low-field magnetic resonance relaxation technology, firstly, low-field magnetic resonance relaxation test analysis is performed on a to-be-tested mortar test piece, and then the compressive strength of the to-be-tested mortar test piece is predicted through a compressive strength prediction model obtained through the mortar compressive strength prediction model construction method based on the low-field magnetic resonance relaxation technology. The mortar compressive strength prediction model based on the low-field magnetic resonance relaxation technology is high in applicability and good in stability, and the mortar compressive strength prediction method based on the low-field magnetic resonance relaxation technology minimizes damage to buildings while accurately predicting the mortar compressive strength.

The invention relates to the technical field of asphalt concrete detection, in particular to an asphalt concrete strength detection device which comprises a press machine, an upper pressing plate and a lower placing table, the protective cover is movably arranged in a base of the press machine; the gas injection mechanism is linked with the protective cover and is driven by the upward movement of the protective cover; the annular air bag is arranged on the periphery of the lower placement table and communicated with the air injection mechanism, automatic centering of the concrete sample is achieved through radial pushing of the annular air bag, and the problem that it is difficult to guarantee that the sample and the pressing plate are strictly coaxial through traditional manual placement is solved; the air bag is completely deflated and shrunk before being pressurized and is separated from the side wall of the sample, so that the interference of lateral supporting force on a detection result is thoroughly eliminated, the phenomenon that the strength value is virtually high due to constraint stress is avoided, and the accuracy and repeatability of the compressive strength test are effectively improved.

The invention discloses a chitin-silicon-calcium-based modified material for rammed earth wall repair and a weather resistance evaluation method thereof, and belongs to the technical field of rammed earth wall repair, the chitin-silicon-calcium-based modified material comprises metakaolin, calcium oxide, quartz and chitin; the ratio of chitin to metakaolin to calcium oxide to quartz is 1: 1: 2: 4; the method comprises the following steps: pre-treating at the earlier stage of a test, evaluating freeze-thaw cycle performance, evaluating dry-wet cycle performance, evaluating salt corrosion resistance, analyzing association between a microstructure and a strength performance, and finally, revealing a material degradation rule and mechanism by combining scanning electron microscope observation, unconfined compressive strength test and crack rate analysis. When the freezing and thawing cycle number N is less than or equal to 5, the dry and wet cycle number I is less than or equal to 9, and the salt solution concentration c is less than or equal to 0.3 mol / L, the characteristics of freezing and thawing resistance, dry and wet resistance, salt erosion resistance and the like of the modified material are obviously improved; after the modified material is added, internal pores of plain soil can be filled, unconfined compressive strength of a soil body is enhanced, and long-term durability of the soil body is improved.