17 results about "Compressive strength test" patented technology

The utility model discloses a kind of compressive strength testing devices for building materials, belong to building material inspection technical field, including support platform, electric push rod is provided on support platform, the output end of electric push rod is arranged with pressing plate, further include the blocking and protecting structure for blocking the building material fragments of splashing arranged on support platform, blocking and protecting structure includes the blocking and protecting box arranged on support platform and slidingly sleeved on the output end of electric push rod. The utility model, when building material is crushed under pressure, the setting of blocking and protecting box can block the splashing residue, avoid residue leakage, when residue needs to be cleaned, only need to pull mounting plate, make support slide plate from the below of material placing flap disengagement, at this time material placing flap will be turned down, make residue fall into the material receiving box below, to clean and recycle residue, by setting the turnover of material placing flap, residue in blocking and protecting box can be cleaned more thoroughly, to carry out subsequent compressive strength test quickly.

This invention discloses a method for obtaining the strength of a pillar considering friction factors, comprising: preparing rock samples with different aspect ratios and configuring contact surface materials with different tribological properties; determining the cohesion and friction coefficient of each contact surface material through shear testing, conducting compressive strength tests on rock samples with different contact surface materials to obtain rock sample strength data under different friction levels and aspect ratios; selecting a pillar strength calculation formula corresponding to the actual contact conditions between the pillar and the surrounding rock, calculating the strength of the target pillar under design conditions, and calculating the load on the pillar itself based on the pillar area bearing theory; calculating the pillar safety factor based on the pillar strength and the load, and optimizing the pillar design accordingly.

This invention discloses a concrete sample compressive strength testing device, relating to the field of concrete testing technology. It includes a base plate, with a testing cylinder and a vertical rod fixedly connected to the upper side of the base plate. A top plate is fixedly connected to the upper end of the vertical rod, and a hydraulic cylinder is fixedly connected to the upper side of the top plate. A cleaning unit is provided at the lower output end of the hydraulic cylinder. The cleaning unit includes a fixed frame, which is fixedly connected to the lower output end of the hydraulic cylinder. A fixed cylinder is fixedly connected to the lower side of the fixed frame, and a rotating shaft is rotatably connected to the inner side of the fixed cylinder. A mounting plate is fixedly connected to the lower end of the rotating shaft. This concrete sample compressive strength testing device uses a hydraulic cylinder to control the descent of the testing head to test the concrete sample. After testing, the testing head is controlled to rise, bringing a flexible scraper into contact with the testing head, and the testing head is controlled to rotate, cleaning debris from the surface of the testing head. The operation is simple and convenient for subsequent tests.

The present application relates to the technical field of geological exploration, and discloses a rock mass compressive strength testing device, which comprises a rack, a working chamber is formed in the rack, a hydraulic cylinder is installed on the top of the rack, the output end of the hydraulic cylinder is located in the working chamber, and a pressing head is installed on the output end of the hydraulic cylinder; a placing table is installed on the bottom of the rack and used for placing a sample; and an automatic placing assembly is installed on the placing table and used for automatically moving the sample to the center of the top surface of the placing table. The present application can automatically adjust the position of the sample, quickly place the sample on the detection position on the placing table, and is safe and reliable to use, and the present application can conveniently clean the surface of the placing table, avoid the surface of the placing table from being covered with rock particles, and is more convenient to use.

This invention relates to the field of paper testing, and more particularly to a compressive strength testing device for kraft paper production. The device includes a testing platform with top frames fixed to both sides of its upper end. Support rods are fixed between the upper end of the testing platform and the top frames. A set of flattening rollers is rotatably mounted on the upper end of the top frames. Kraft paper passes through the gaps between the flattening rollers. A set of clamping plates is provided at both the upper and lower ends inside the top frames. The clamping plates are installed in clamping brackets at both ends, with the upper clamping bracket fixed to the top frame and the lower clamping bracket slidably mounted on the support rods at both ends. A pressure-applying component is provided on one side of the top frame, and a testing component is provided below the testing platform. This invention utilizes a single testing device to simultaneously perform tensile and compressive strength tests on kraft paper, achieving high testing accuracy and good testing results. Furthermore, it effectively prevents the clamping plates from loosening during testing, thereby greatly improving the clamping stability of the kraft paper and preventing it from loosening and detaching.

This invention relates to the field of cement building materials technology, specifically disclosing a method for improving the strength of silicate clinker based on mineral and crystal composition analysis. The method involves collecting 3-day and 28-day compressive strength test data of silicate clinker and quantitatively analyzing the mineral and crystal composition data using XRD. A mineral composition and strength zoning statistical method is employed to obtain appropriate C3S or C2S content to maintain a relatively good overall level of 3-day and 28-day compressive strength of the clinker. Then, a stepwise multiple linear regression analysis is used to establish the relationship between the 3-day and 28-day compressive strength of the clinker, clinker liter weight, f-CaO, the content of other chemical components, and the mineral composition and crystal content of the clinker. Specific analytical methods are used to determine optimization measures, further optimizing and improving the clinker strength. Using the above method, the 3-day and 28-day compressive strength of silicate clinker can be improved simultaneously.

This utility model discloses a compressive strength testing device for cement-modified mudstone. The device includes a base, a test plate on the upper surface of the base, a pressure sensor fixed at the connection between the lower surface of the test plate and the upper surface of the base, and top frames fixedly installed at both ends of the upper surface of the base. Two cylinders are fixedly installed at the top of the top frames, and pressure plates are fixedly installed inside the top frames at the ends of the two cylinders. By designing a cleaning and scraping mechanism, when cement particles remain on the surfaces of the pressure plates and test plates after testing, the moving frame and scraper can be stably moved so that the scrapers on both sides contact the surfaces of the test plates and pressure plates respectively to scrape and clean them. This facilitates cleaning, and allows for accurate testing of mudstone placed stably on the surface of the test plate during subsequent tests. This improves the convenience and accuracy of cleaning the main body of the compressive strength testing device during cement-modified mudstone compressive strength testing.

This invention discloses a method for constructing a constitutive model of interface bond-slip in salt-eroded masonry structures of ancient pagodas, belonging to the fields of interface deterioration prediction methods and computational mechanics for immovable cultural relics. This method involves conducting interface bond-slip tests on un-salted masonry, salt aging tests with different cycles, mortar compressive strength tests, and interface double-sided shear tests. Key parameters such as normal stress, mortar strength, and the number of salt erosion cycles are introduced to establish calculation models for interface bond strength and corresponding slip, respectively. These models are then fitted to obtain a coupled constitutive model of interface bond-slip in salt-eroded masonry. This invention considers the impact of salt erosion damage on the mechanical properties of the masonry interface, and the calculation results have small errors compared to experimental values, providing accurate mechanical parameter basis for the structural stability assessment of ancient pagodas and other historical masonry buildings.

This invention proposes a method for testing the compressive strength of carbonized seawater sand concrete, comprising: preparing seawater sand concrete specimens and carbonizing them until fully carbonized; preloading and then unloading the specimens on a testing machine, followed by displacement-controlled loading; collecting data through strain gauges during the ascending phase, and switching to a displacement extensometer to collect deformation during the descending phase when the load reaches 70-80% of the peak load, while simultaneously reducing the loading rate until the specimen is completely destroyed; performing dimensionless processing on the two data segments, and using a two-segment model of polynomial ascending phase and rational fractional descending phase for least squares fitting to construct a full-curve constitutive relationship, effectively solving the data discontinuity problem caused by strain gauge detachment during the descending phase of highly brittle materials; the obtained model has a high goodness of fit and the physical meaning of the parameters is clear.

The application discloses a performance detection method and system of ultra-high performance concrete, and particularly relates to the technical field of building material performance detection, and is used for solving the problem of strength test discreteness caused by the neglect of the time effect after high-temperature curing in the existing detection method; the first time point at which a test piece completes room temperature cooling and the second time point at which a press machine loads are recorded, dual quantitative analysis of the fiber pull-out fragment proportion and the crack fractal dimension in the damage process image is combined, and a comprehensive time effect factor is generated; the strength correction coefficient is matched from a preset table according to the time effect factor, and the first compressive strength test result is dynamically calibrated; the accurate correlation between the time effect damage mechanism and the macro strength is realized, and the reliability evaluation precision of the ultra-high performance concrete in major projects is significantly improved.

This invention discloses a method and related apparatus for predicting the strength of cement-stabilized soil, relating to the field of building materials. The prediction method includes determining the normalized unconfined compressive strength index I of cement-stabilized soil based on the solidification test parameters and basic physical properties of the cement-stabilized soil sample; determining the unconfined compressive strength test value of the cement-stabilized soil; fitting I and the test value into a formula, calculating the values ​​of a and b, and substituting them into the formula to obtain the prediction model formula, which can be used to predict the unconfined compressive strength of cement-stabilized soil. Based on the physical properties of the solidified soil, the solidification test parameters, and the unconfined compressive strength test value, this application constructs a prediction model formula for the unconfined compressive strength of cement-stabilized soil with this strength index as the sole predictor variable, thereby achieving rapid prediction of the strength of cement-stabilized soil, reducing on-site testing costs, and improving construction efficiency and quality.

This invention discloses a method and system for optimizing the proportion of tailings cementitious materials based on response surface methodology, relating to the field of tailings recycling technology. The method includes: using lead-zinc tailings content, fly ash content, sand-cement ratio, and water-cement ratio as process parameters, determining multiple cementitious material formulations based on response surface methodology; preparing physical cementitious material test blocks according to these formulations; conducting compressive strength tests to obtain the compressive strength results; establishing a compressive strength prediction model based on the results using regression analysis; and determining a target combination of process parameters based on the compressive strength prediction model, with a target compressive strength or target cost-effectiveness ratio as the objective. The target combination of process parameters is the proportion of lead-zinc tailings content, fly ash content, sand-cement ratio, and water-cement ratio. The cementitious material is then produced using this target combination of process parameters. This invention systematically optimizes the proportion of tailings cementitious materials through response surface methodology, establishing a compressive strength prediction model to achieve controllable performance prediction, providing a scientific solution for tailings resource utilization.

The utility model belongs to corrugated board application technical field, specifically disclose environmental protection moistureproof fire -resistant type corrugated board compressive strength testing device, including pry mounting type pedestal, motor installation platform, PLC controller, horizontal table board, power motor, coupling, sliding slot, sliding block, sliding block screw hole, screw rod, crosspiece, a plurality of transition plates, pressure -exerting portion, horizontal pressure -bearing plate, a plurality of pressure sensor installation groove, with signal line pressure sensor and transition pressure -bearing boss etc. Among them, power motor, with signal line pressure sensor are connected with PLC controller respectively. The utility model discloses environmental protection moistureproof fire -resistant type corrugated board compressive strength testing device's beneficial effect lies in: 1, has the advantages such as reasonable structure design and low production cost, 2, simple operation, safety, realize corrugated board multiple parts's synchronous use environment under simulation compressive strength detection, 3, can realize semi -automatic intelligent compressive strength test, satisfy accurate and efficient test use.

This utility model relates to the field of compressive strength testing technology, specifically a compressive strength testing device for recycled concrete samples. It includes: a body comprising a support platform and a telescopic cylinder; a support frame is fixedly connected to the surface of the support platform, and a pressure plate is connected to the output shaft of the telescopic cylinder; and a support mechanism including a connecting frame, which is fixedly connected to the upper surface of the support platform. An adjustment groove is formed on the surface of the support platform, and a sliding groove is formed through the surface of the connecting frame. This utility model, through the connection of the movable rod and the stop rod, allows the stop rod and the limiting plate to change position within the adjustment groove, achieving a supporting effect on the sample placed on the support platform. This prevents the sample from shifting position during compressive strength testing, thus affecting the test results. The connection of the clamping plate and the clamping groove provides support for the pressure plate's position, thereby enabling rapid assembly and disassembly between the telescopic cylinder and the pressure plate, improving testing efficiency and performance.

This utility model relates to the field of concrete sample testing technology, and discloses a concrete sample compressive strength testing device, including a base, a lower pressure plate disposed in the middle of the upper side of the base, columns disposed at the four corners of the upper part of the base, the upper ends of the columns being installed at the four corners of the lower part of a support plate, a hydraulic rod being installed in the middle of the support plate, and a centering mechanism disposed in the upper part of the support plate. In this concrete sample compressive strength testing device, a reduction motor drives a drive gear, a transmission gear ring, and a driven gear in a coordinated manner, causing the threaded rod and connecting plate to move up and down. Furthermore, through the connecting rod and push rod of the pushing assembly, rollers apply pushing force to the workpiece from four directions, ensuring that the workpiece is in the center position corresponding to the upper and lower pressure plates. This symmetrical and synchronous positioning method avoids uneven pressure caused by workpiece misalignment, improving the accuracy of the inspection.

This invention discloses an instrument and method for compacting permeable concrete specimens. The instrument includes a base, a rotating impact mechanism, a specimen preparation mold, a gantry frame, and a lifting and adjusting mechanism. The rotating impact mechanism includes a bearing block and a rotating component. The specimen preparation mold is installed on top of the bearing block. The hammering mechanism includes a guide rod and a heavy hammer. The compaction mechanism includes a connecting block and a concrete tamping rod. The lifting and adjusting mechanism can clamp the heavy hammer or the connecting block. The method includes the following steps: 1. Installing the specimen preparation mold; 2. Installing the concrete tamping rod on the lifting and adjusting mechanism; 3. Compacting the permeable concrete specimen; 4. Installing the hammering mechanism on the lifting and adjusting mechanism; 5. Compacting the permeable concrete specimen; 6. Testing the permeable concrete specimen. This invention is reasonably designed and can obtain data on the preparation of permeable concrete specimens and the testing of their permeability coefficient and compressive strength under different compaction times, heavy hammer weights, heavy hammer heights, and hammering times.

This invention relates to the field of composite material performance testing technology, and discloses a press and testing method for testing the performance of adhesive samples of aluminum-copper composite plates, solving the problem of low testing accuracy. The press includes a support mechanism, a pressure applying mechanism at the top of the support mechanism, a heating mechanism at the top of the pressure applying mechanism, a positioning mechanism on the side of the support mechanism, and a testing mechanism on the side of the support mechanism. The pressure applying mechanism uses a hydraulic rod to drive a pressure plate to apply pressure to the sample. The heating mechanism uses symmetrically arranged heating plates. The testing mechanism includes a two-dimensional laser profile scanner and a high-frequency planar focusing ultrasonic probe. This device is specifically designed for small-sized aluminum-copper composite plate samples. It is small in size, low in energy consumption, and easy to operate, requiring no large production equipment resources. It can quickly complete high-temperature compressive strength tests and defect detection of small samples in the laboratory, resulting in low testing costs and significantly reducing the cost of process development and quality verification.