Anti-segregation evaluation device for lightweight concrete
By designing a lightweight concrete segregation evaluation device that incorporates aluminum profiles and polymethyl methacrylate materials, the problem that existing devices cannot accurately reflect the quality differences of lightweight concrete is solved, achieving high-precision segregation evaluation and simplifying the operation process.
Patent Information
- Application Number
- CN202422910510.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Existing concrete segregation evaluation devices cannot effectively reflect the quality differences of lightweight concrete, are difficult to operate, and produce inaccurate test results.
An evaluation device was designed, comprising a vibration table base, a buffer device, a placement platform, a vibration motor, and an anti-segregation analysis device. The device uses aluminum profiles and polymethyl methacrylate materials, combined with a buffer device and rubber plugs to ensure the stability and sealing of the device. The vibration motor simulates the vibration environment in actual applications, and the degree of segregation of concrete is evaluated by layered weighing.
It improves the accuracy and repeatability of segregation resistance evaluation of lightweight concrete, simplifies the operation process, and provides scientific data support for the improvement of lightweight concrete materials.
Smart Images
Figure CN223565497U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to concrete technical field, specifically disclose a kind of anti-segregation evaluation device for lightweight concrete. BACKGROUND
[0002] With the rapid development of technology and environmental problems increasingly highlighted, sustainable environmental protection building materials are increasingly urgent in the field of concrete. To meet this demand, lightweight concrete needs to use less material in production, reduce greenhouse gas emissions, and meet the needs of building projects at low cost. With the development of lightweight building, lightweight concrete is widely used, especially in situations where the structure weight is reduced. Its low density and high thermal insulation performance help improve building efficiency, especially in projects that require insulation or thermal insulation. However, lightweight concrete needs to pay special attention to mixing uniformity.
[0003] One of the potential factors that cause concrete damage is the unevenness of concrete. Proper mixing scheme can ensure mixing uniformity, so more attention needs to be paid to the segregation resistance of the mixture. Common methods for evaluating the segregation resistance of ordinary concrete mixtures include analyzing the quality ratio of the upper layer of concrete mortar, in addition to ultrasonic measurement, radioactive element labeling, layer uniformity and segregation degree. These methods are mainly static evaluation methods, which are not suitable for evaluating the floating segregation of lightweight aggregates. By pouring the mixture into a prismatic mold and vibrating it, the center of gravity of the mixture can be measured, and the direction and degree of segregation can be evaluated according to the change in the position of the center of gravity. This method takes into account the effect of vibration on segregation, but it is not easy to operate to determine the center of gravity. In addition, the coarse aggregate vibration segregation rate is used in the "Application Technical Specification for Self-compacting Concrete" (JGJ / T 283-2012) to evaluate the segregation resistance of the mixture. This method divides the mixture into three layers, each 100mm high, simulates the dynamic process of the mixture by vibrating, and evaluates the mass difference between the three layers of the mixture, providing ideas for evaluating the segregation resistance. Due to the lightweight nature of lightweight concrete, the height of this test device is quite low, and it cannot well reflect the mass difference. SUMMARY
[0004] The utility model aims at providing a kind of anti-segregation evaluation device for lightweight concrete, to solve the problem that the existing concrete segregation resistance evaluation cannot well reflect the mass difference of lightweight concrete, further optimize operation process, reduce the operation difficulty of lightweight concrete segregation resistance evaluation, accurately evaluate the segregation resistance of lightweight concrete.
[0005] In order to realize the above-mentioned utility model purposes, the utility model adopts the technical scheme as follows: an anti-segregation evaluation device for lightweight concrete, characterized in that the surface of the vibration table base is fixedly connected with a buffer device around, one side surface of the buffer device is provided with a placing table, the placing table is fixedly connected to the one side surface of the buffer device, the buffer devices are all fixedly connected below the placing table, a vibration motor is fixedly connected below the placing table, an anti-segregation analysis device is fixedly connected above the placing table, and the anti-segregation analysis device comprises a cylinder and a rubber plug.
[0006] Preferably, the vibration table base is fixedly connected by 12 aluminum profiles.
[0007] By adopting the above technical scheme, the aluminum profile has good strength and rigidity, the fixed connection can effectively increase the structural strength of the base, the vibration table is more stable during work, and structural deformation during vibration is reduced.
[0008] Preferably, the buffer device comprises a spring and an angle pad plate, the angle pad plate and the spring are fixedly connected, the buffer device is fixedly connected with the placing table through an internal hexagonal countersunk head screw, and the buffer device is fixedly connected with the vibration table base through four internal hexagonal round head screws.
[0009] By adopting the above technical scheme, the buffer device can effectively absorb and relieve vibration and impact, reduce the influence of the outside on the inside of the device, prolong the service life of the equipment, reduce maintenance and replacement costs, the buffer device can stabilize the vibration frequency, prevent external interference, and improve the accuracy and consistency of experimental data.
[0010] Preferably, the anti-segregation analysis device comprises a cylinder and a rubber plug, and the anti-segregation analysis device is fixedly connected with the placing table.
[0011] By adopting the above technical scheme, the transparent polymethyl methacrylate material facilitates observation of the position and state of the mixture in the cylinder, the circular shape reduces the influence of the equipment boundary on the mixture, and the circular rubber plug can satisfy the sealing property of the cylinder.
[0012] Preferably, the outer diameter of the cylinder is 115 mm, the inner diameter is 100 mm, the cylinder outflow hole diameter is 30 mm, the hole spacing is 100 mm, there are four holes in each layer, the total height is 700 mm, and the effective test height is six layers.
[0013] By adopting the technical scheme, the aperture ensures the appropriate amount of mixture required for single test, the size of the outflow aperture ensures that the test object can pass through easily, the 100mm hole spacing can ensure sufficient equipment strength and appropriate height, since lightweight concrete is lighter, the 700mm height fully reflects the difference between layers, in order to reduce experimental errors of the device, an additional layer is added as an auxiliary layer to ensure the uniform volume of each layer.
[0014] As preferred, the vibration motor and the placement table are fixedly connected through four internal hexagon countersunk head screws, and the vibration motor is of a 220V-40W-ASSY type.
[0015] By adopting the technical scheme, the fixed connection ensures the stability of the device during operation, the vibration motor has moderate power, can meet the requirements of lightweight concrete segregation resistance test, can control power consumption, save power, and improve the overall energy efficiency of the device.
[0016] Compared with the prior art, the anti-segregation evaluation device for lightweight concrete has the following beneficial effects:
[0017] The anti-segregation evaluation device for lightweight concrete effectively solves the problem that the existing device has low height and cannot well reflect the quality difference, and optimizes the operation process. The device has a simple structure, high accuracy and repeatability of experimental results, the cylinder and rubber plug structure in the anti-segregation analysis device can effectively determine the segregation degree of lightweight concrete, provide accurate anti-segregation data, and provide a scientific basis for improvement of lightweight concrete materials. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 Fig. 2 is a schematic view of the appearance split structure of the second embodiment of the device;
[0019] Figure 2 Fig. 3 is a schematic view of the anti-segregation analysis device assembly structure of the device;
[0020] Wherein: 1, vibration table base; 2, buffer device; 3, placement table; 4, anti-segregation analysis device; 401, cylinder; 402, rubber plug; 5, vibration motor. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the device will be clearly and completely described below with reference to the drawings in the embodiments of the device. Obviously, the described embodiments are only part of the embodiments of the device, rather than all the embodiments. Based on the embodiments in the device, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the device.
[0022] Please refer toFigure 1 The utility model provides a technical scheme: a kind of anti-segregation evaluation device for lightweight concrete, the surface of the vibration table base 1 is uniformly fixedly connected with buffer device 2, one side surface of the buffer device 2 is provided with placing table 3, the placing table 3 is fixedly connected on the one side surface of buffer device 2, the buffer device 2 is fixedly connected below placing table 3, vibration motor 5 is fixedly connected below the placing table 3, and anti-segregation analysis device 4 is fixedly connected above the placing table 3.
[0023] Wherein: vibration table base 1 is fixedly connected by 12 aluminum profiles, buffer device 2 includes spring and angle backing plate, and angle backing plate and spring are fixedly connected, buffer device 2 is fixedly connected with placing table 3 by internal hexagon countersunk head screw, and buffer device 2 is fixedly connected with vibration table base 1 by 4 internal hexagon round head screws.The anti-segregation analysis device includes cylinder and rubber plug, and anti-segregation analysis device 4 is fixedly connected with placing table 3.The material of cylinder 401 is polymethyl methacrylate, the material of rubber plug 402 is rubber, and cylinder 401 and rubber plug 402 form tight fit between each other.The outer diameter of cylinder 401 is 115mm, the inner diameter is 100mm, the flow hole diameter of cylinder 401 is 30mm, the hole spacing is 100mm, there are 4 holes in each layer, the total height is 700mm, and the effective test height is 6 layers.
[0024] The inner and outer surfaces of the cylinder 401 are coated with mortar having the same water-cement ratio as the concrete to ensure that the concrete does not come into direct contact with the surface of the cylinder 401 during vibration, preventing it from adhering to the wall of the cylinder. The flow outlet of the cylinder is sealed with a rubber plug 402 to prevent the mixture from flowing out, and the mixture is uniformly filled into the cylinder through the top opening. Start the vibration motor to make the mixture in the cylinder vibrate at a speed of 2000 to 4000 rpm and an amplitude range of 0.3 to 2 mm for 60 seconds. The vibration promotes the different components in the mixture, such as aggregates and cement paste, to separate under the action of centrifugal force and gravity. After the vibration is completed, the top layer of concrete that is not vibrated is removed, and then the concrete is released layer by layer from top to bottom, forming six layers of samples numbered 1#, 2#, 3#, 4#, 5#, and 6#. The weight of each layer of sample is weighed to evaluate the degree of concrete separation. By weighing the weight of each layer, the density or composition difference of the mixture at different heights is analyzed. The degree of segregation of the concrete can be quantitatively evaluated by the weight difference of each layer. A larger weight difference indicates a higher degree of segregation of the concrete, while a close weight indicates a lower degree of segregation.
[0025] Example 1
[0026] A lightweight concrete is composed of the following components:
[0027] Water, cement, fly ash, granulated blast furnace slag, wood, sand, alkali activator, copper ammonia preservative.
[0028] Wherein, the cement is ordinary Portland cement, Southern cement, P.O 42.5.
[0029] Wherein, the wood as light aggregate, comes from furniture processing plant, particle size 5-20mm.
[0030] Wherein, the sand comes from the market, particle size 30-50 mesh.
[0031] Wherein, the alkali activator is a compound of sodium hydroxide and sodium silicate.
[0032] Sodium hydroxide comes from the market, content 98%, CAS number: 1310-73-2.
[0033] Sodium silicate comes from the market, mass fraction 44.6%, CAS number: 1344-09-8.
[0034] Wherein, the copper ammonia preservative is copper ammonia quaternary ammonium salt, which comes from the market.
[0035] Mix 150kg wood evenly in 0.25% copper ammonia quaternary ammonium salt solution for pressure impregnation for 12h, ensure that the preservative penetrates into the wood, and the treated wood is fully aired for 1 week to obtain the preservative wood.
[0036] Mix 150kg preservative wood and 350kg sand evenly with a mixer, speed 45r / min, stirring for 20min. Mix 100kg cement and 45kg water evenly, speed 45r / min, stirring for 10min. Ensure that the two are fully mixed. Mix the combined preservative wood and sand with the combination of cement, fly ash and granulated blast furnace slag, speed 60r / min, stirring for 10min to form a mixture.
[0037] Mix 16kg sodium silicate and 8kg sodium hydroxide to obtain alkali activator, slowly add the alkali activator to the mixture of the previous step, 45r / min, stirring for 10min to ensure uniform mixing, to obtain low consumption and environmentally friendly lightweight concrete.
[0038] The mortar matrix is applied to the inner and outer surfaces of the cylinder; the outflow hole of the cylinder is sealed with a rubber plug and wrapped with transparent tape to fix the rubber plug; the mixture is filled into the cylinder through the top opening; the air cylinder is placed on the vibration table, the driving device is started to vibrate the workbench, the speed range of the driving device is 2000-4000 rpm, the amplitude range is 0.3-2 mm, and the mixture in the air cylinder is vibrated for 60 seconds; the top layer of concrete is removed, and the remaining six layers of concrete are released from top to bottom in turn, numbered 1#, 2#, 3#, 4#, 5# and 6#, and the six parts are weighed. The specific test data is shown in Table 1.
[0039] Example 2
[0040] A lightweight concrete is composed of the following components:
[0041] Water, cement, fly ash, granulated blast furnace slag, wood, sandstone, alkali activator, copper ammonia preservative.
[0042] Among them, the cement is ordinary Portland cement, Southern Cement, P.O 42.5.
[0043] Among them, the wood as lightweight aggregate, from furniture processing plant, particle size 5-20mm.
[0044] Among them, the sandstone is commercially available, with a particle size of 30-50 mesh.
[0045] Among them, the alkali activator is a complex of sodium hydroxide and sodium silicate.
[0046] Sodium hydroxide is commercially available, with a content of 98%, CAS number: 1310-73-2.
[0047] Sodium silicate is commercially available, with a mass fraction of 44.6%, CAS number: 1344-09-8.
[0048] Among them, the copper ammonia preservative is copper ammonia quaternary ammonium salt, which is commercially available.
[0049] 150kg of wood is uniformly mixed in a 0.25% copper ammonia quaternary ammonium salt solution for pressure impregnation for 12h, to ensure that the preservative penetrates into the wood. The treated wood is fully aired for 1 week to obtain preservative wood.
[0050] Use a mixer to mix 150kg of preservative wood and 350kg of sandstone uniformly, at a speed of 45r / min, and stir for 20min. Mix 100kg of cement and 75kg of water uniformly, at a speed of 45r / min, and stir for 10min. Ensure that the two are fully mixed. Mix the combined preservative wood and sandstone with the combination of cement, fly ash and granulated blast furnace slag, at a speed of 60r / min, and stir for 10min to form a mixture.
[0051] Mix 16 kg sodium silicate and 8 kg sodium hydroxide to obtain an alkaline activator, slowly add the alkaline activator to the mixture of the previous step, stir at 45 r / min for 10 min to ensure uniform mixing, to obtain low-consumption environment-friendly lightweight concrete.
[0052] The mortar matrix is applied to the inner and outer surfaces of the cylinder; the outflow hole of the cylinder is sealed with a rubber plug and wrapped with transparent tape to fix the rubber plug; the mixture is filled into the cylinder through the top opening; the air cylinder is placed on the vibration table, and the driving device is started to vibrate the workbench, the speed range of the driving device is 2000-4000 rpm, and the amplitude range is 0-2 mm, so that the mixture in the air cylinder is vibrated for 60 seconds; the top layer of concrete is removed, and the remaining six layers of concrete are released from top to bottom in sequence, numbered as 1#, 2#, 3#, 4#, 5# and 6#, and the six parts are weighed. The specific detection data of the experiment is shown in Table 1.
[0053] Table 1
[0054]
[0055] The working principle of the utility model is: in the vibration process, different particles (such as sand, stone, cement mortar, etc.) in the concrete will produce relative movement due to the joint action of gravity and vibration force. The heavier particles (such as stone) tend to sink, while the lighter components (such as cement mortar) tend to float, resulting in stratification. In the anti-segregation experimental device, the lightweight concrete sample will stratify after a certain time under vibration. Through the driving of the vibration motor, the sample is vibrated under controlled frequency and amplitude to simulate the vibration environment in actual application. After the experiment, according to the mass difference of the stratification of the concrete sample from top to bottom, the stratification degree of the concrete can be quantified.
[0056] In the experiment, by weighing the mass of each layer of concrete, the change of the distribution of its particles can be observed. The concrete with good anti-segregation performance has small weight difference between each layer after vibration, indicating that the particle distribution is uniform and no significant stratification occurs; while the concrete with poor anti-segregation performance has significantly increased particles in the bottom layer after vibration, resulting in the bottom layer being heavier than the top layer, and the segregation phenomenon is obvious.
[0057] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. An apparatus for evaluating resistance to segregation of lightweight concrete, characterized by, The surface of the vibration table base (1) is fixedly connected with buffer devices (2) around, one side surface of the buffer device (2) is provided with a placing table (3), the placing table (3) is fixedly connected to one side surface of the buffer device (2), the buffer device (2) is fixedly connected below the placing table (3), the vibration motor (5) is fixedly connected below the placing table (3), the anti-segregation analysis device (4) is fixedly connected above the placing table (3), the anti-segregation analysis device comprises a cylinder (401) and a rubber plug (402).
2. A segregation evaluation device for lightweight concrete according to claim 1, characterized in that: The cylinder (401) is made of polymethyl methacrylate, the rubber plug (402) is made of rubber, and the cylinder (401) and the rubber plug (402) are tightly matched.
3. A segregation evaluation device for lightweight concrete according to claim 1, characterized in that: The buffer device (2) comprises a spring and an angle pad plate, the angle pad plate and the spring are fixedly connected, the buffer device is fixedly connected with the placing table through an internal hexagonal countersunk head screw, and the buffer device is fixedly connected with the vibration table base through an internal hexagonal round head screw.
4. The segregation evaluation device for lightweight concrete according to claim 1, characterized by: The placing table (3) is movably connected between the buffer device (2) and the vibration table base (1), and the buffer devices (2) are distributed at four corners of one side surface of the vibration table base (1).
5. A segregation evaluation device for lightweight concrete according to claim 1, characterized in that: The vibration motor (5) and the placing table (3) are fixedly connected through four internal hexagonal countersunk head screws.
6. A segregation evaluation device for lightweight concrete according to claim 1, characterized by: The vibration table base (1) is fixedly connected by aluminum profiles.