Integrated device for concrete curing and early-age strength testing under laboratory simulated temperature and load combination environment

Abstract

The present invention relates to an integrated device for concrete curing and early-age strength testing under a laboratory simulated temperature load combination environment, which is composed of a first vertical plate, a second vertical plate, a first fixed plate, a second fixed plate, a casting base, a resistance heating plate, a semiconductor cooling plate, a temperature control system, a pressure control system, etc. The present invention uses a resistance heating plate, a semiconductor cooling plate and a pressure control system to achieve a different temperature load combination curing environment for concrete, simulating the early casting and curing state of concrete structures in actual engineering. At the same time, it can realize the integration of concrete casting and mechanical properties testing, effectively solving the error influence on the mechanical properties testing of concrete caused by objective factors such as demolding, and arranging temperature measuring points inside the concrete to obtain the temperature change law at the temperature measuring points over time, which is conducive to mastering the heat release of concrete hydration under the temperature load combination. The present invention can provide an important means for concrete testing under the temperature load combination curing environment in actual engineering.

Description

Technical Field

[0001] The invention relates to the technical field of concrete curing tests, and in particular to an integrated device for concrete curing and early-age strength testing in a laboratory simulated temperature-load combination environment. Background Art

[0002] The on-site curing environment during concrete engineering construction is complex and diverse, and there is a big difference compared with the standard laboratory curing environment (temperature 20±2℃, relative humidity 95%). For example, during the freezing method of well drilling construction, the concrete near the well wall is in a low-temperature load curing environment, while the concrete located in the center of the well wall is in a high-temperature load curing environment. Even in the construction and curing stage of some special projects, one side of the concrete is in low-temperature load curing and the other is in high-temperature load curing. At present, it is relatively easy to simulate the temperature or load alone in the concrete curing stage in the laboratory, but under actual working conditions, temperature and load often act at the same time. The effects of the two are definitely not simply superimposed, and there should be mutual coupling. Then it is key to design a test device that can simulate the temperature and load combination environment of the concrete curing stage. At the same time, the early age strength of concrete largely determines the construction speed. At present, when conducting concrete strength tests under the action of temperature or load alone during the construction and curing stage in the laboratory, the concrete specimens are first taken out of the simulated curing environment, and then placed in a room temperature environment and tested for strength using a pressure testing machine. Obviously, the influence of the curing environment was not taken into account during the strength test, so the test results obtained were also quite different from the actual working conditions. In response to the above technical problems, the present invention has developed a concrete curing device that can simulate the temperature load combination environment in the laboratory, and based on the low strength of early-age concrete, it can also be used to test the early strength of concrete under the simulated curing environment. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an integrated device for concrete curing and early age strength testing under a laboratory simulated temperature and load combination environment. The test device is equipped with temperature control equipment and loading equipment, which can not only be used to simulate the concrete curing conditions under high and low temperature load environments on site, but also can perform strength tests on concrete under complex early age curing environments, thereby obtaining early age concrete mechanical performance parameters that are closer to actual working conditions, and providing experimental basis and scientific theory for concrete structure design and safe use under corresponding working conditions.

[0004] To achieve the above purpose, the technical solution of the present invention is as follows:

[0005] The invention discloses an integrated device for concrete curing and early-age strength testing under a laboratory simulated temperature load combination environment, comprising a first vertical plate, a second vertical plate, a first fixed plate, a second fixed plate, a casting base, a first vertical plate extension block, a resistance heating plate, a semiconductor cooling plate, a temperature control system, a pressure control system, a large nut, a small nut, a reaction base, a screw rod, a hydraulic loading cylinder and a vertical plate slide bar. The casting base is connected to the first fixed plate and the second fixed plate. The first fixed plate and the second fixed plate are both connected to the vertical plate slide bar to form a whole and are fixedly connected to the first vertical plate and the second vertical plate through a small nut to form a concrete mold. The reaction base, the screw rod, the large nut and the hydraulic loading cylinder are interconnected to form a loading system. The temperature control system is connected to the temperature measuring point in the concrete mold through a temperature measuring line. The resistance heating plate and the semiconductor cooling plate are connected to the temperature control system through a wire. A square groove is arranged on one side of the first vertical plate, and a square convex groove and a square groove are respectively arranged on both sides of the first vertical plate extension block.

[0006] Preferably, in the above-mentioned integrated device for concrete curing and early age strength testing under a laboratory simulated temperature load combination environment, scale lines are set on the inner surface of the first fixed plate, and the first vertical plate, the first vertical plate extension block, the first fixed plate, the second vertical plate, and the second fixed plate are all embedded with resistance heating plates and semiconductor cooling plates, and the resistance heating plates and semiconductor cooling plates are arranged alternately, the maximum test heating temperature of the resistance heating plates is 100°C, and the minimum test temperature of the semiconductor cooling plates is -20°C.

[0007] The integrated device for concrete curing and early-age strength testing under a laboratory simulated temperature load combination environment described in the present invention, wherein the first upright plate, the second upright plate, the first fixed plate, the second fixed plate, the casting base, and the first upright plate extension block are all composed of Q275 steel material, and the dimensions of the second upright plate, the first fixed plate, the second fixed plate, and the casting base are 300mm (length) × 300mm (width) × 25mm (thickness), the dimensions of the first upright plate and the first upright plate extension block are 300mm (length) × 100mm (width) × 25mm (thickness), and the side lengths of the square grooves and square convex grooves are 15mm.

[0008] The integrated device for concrete curing and early-age strength testing under a laboratory simulated temperature and load combination environment described in the present invention has an end face diameter of the hydraulic loading cylinder of 75 mm and a maximum loading pressure of the pressure control system of up to 500 kN.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The device of the present invention can apply different temperatures and loads to the concrete material at an early stage through the resistance heating plate, the semiconductor cooling plate and the loading system, and is used to simulate the concrete curing environment at different positions of the well wall during early pouring during the freezing method construction, and can also simulate the early construction and curing environment of the temperature loads that occur in other concrete projects. At the same time, the device realizes the integration of concrete pouring and mechanical testing, and effectively solves the error influence of human factors such as the falling edges and uneven end faces during the demolding process of early-age concrete on the mechanical properties test of concrete; in addition, the temperature measuring points are arranged inside the concrete to obtain the temperature change law at the temperature measuring points over time, and the hydration heat release of the concrete under temperature load curing is clarified to facilitate the prediction of later performance development. In short, the device of the present invention can simulate the actual temperature load curing environment of complex engineering, making the concrete curing process and test results more realistic, and the obtained performance parameters are more convincing and instructive. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural connection diagram of the embodiment described in the present invention.

[0012] Figure 2 This is a schematic structural diagram of an integrated device for concrete curing and early-age strength testing in a laboratory simulated temperature and load combination environment described in the present invention.

[0013] Figure 3 It is a schematic diagram of the structure of the loading system described in the present invention.

[0014] Figure 4 This is a schematic structural diagram of the first vertical plate extension block described in the present invention.

[0015] Figure 5 This is a schematic diagram of the first vertical plate structure described in the present invention.

[0016] Figure 6 It is a schematic structural diagram of the first vertical plate and the first vertical plate extension block after being combined according to the present invention.

[0017] Figure 7 It is a schematic diagram of the vertical plate sliding rod structure of the present invention.

[0018] Explanation of the numbers in the figure: 1-screw, 2-large nut, 3-reaction base, 4-pressure control system, 5-vertical plate slide rod, 6-semiconductor refrigeration plate, 7-casting base, 8-second vertical plate, 9-hydraulic loading cylinder, 10-second fixed plate, 11-resistance heating plate, 12-temperature control system, 13-first vertical plate, 14-first fixed plate, 15-first vertical plate extension block, 16-small nut, 17-square groove, 18-square convex groove. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0021] In the description of the present invention, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Embodiment 1:

[0023] like Figure 1The device is an integrated device for concrete curing and early-age strength testing under a laboratory simulated temperature load combination environment, comprising a first vertical plate 13, a second vertical plate 8, a first fixed plate 14, a second fixed plate 10, a casting base 7, a first vertical plate extension block 15, a resistance heating plate 11, a semiconductor cooling plate 6, a temperature control system 12, a pressure control system 4, a large nut 2, a small nut 16, a reaction base 3, a screw 1, a hydraulic loading cylinder 9 and a vertical plate slide bar 5. The casting base 7 is connected to the first fixed plate 14 and the second fixed plate 10. The first fixed plate 14 and the second fixed plate 10 are connected to the first fixed plate 14 and the second fixed plate 10. They are all connected to the vertical plate slide rod 5 to form a whole and are fixedly connected to the first vertical plate 13 and the second vertical plate 8 through a small nut 16 to form a concrete mold. The reaction base 3, the screw 1, the large nut 2, and the hydraulic loading cylinder 9 are interconnected to form a loading system. The temperature control system 12 is connected to the temperature measuring point in the concrete mold through a temperature measuring line. The resistance heating plate 11 and the semiconductor refrigeration plate 6 are connected to the temperature control system 12 through a wire. A square groove 17 is set on one side of the first vertical plate 13, and a square convex groove 18 and a square groove 17 are respectively set on both sides of the first vertical plate extension block 15. Scale lines are set on the inner surface of the first fixed plate 14, and the first vertical plate 13, the first vertical plate extension block 15, the first fixed plate 14, the second vertical plate 8, and the second fixed plate 10 are all embedded with resistance heating plates 11 and semiconductor cooling plates 6, and the resistance heating plates 11 and the semiconductor cooling plates 6 are arranged alternately. The maximum test heating temperature of the resistance heating plates 11 is 100°C, and the minimum test temperature of the semiconductor cooling plates 6 is -20°C. The first vertical plate 13, the second vertical plate 8, the first fixed plate 14, the second fixed plate 10, the casting base 7, and the first vertical plate extension block 15 are made of Q275 steel material, and the side length of the square groove 17 and the square convex groove 18 is 15mm.

[0024] The specific steps are as follows:

[0025] (a) According to the concrete specimen size determined in the test plan, the size of the concrete mold is adjusted to the required size by adjusting the second vertical plate 8 and adding a plurality of first vertical plate extension blocks 15 to the first vertical plate 13;

[0026] (b) Tighten the small nuts 16 to fix the first vertical plate 13 and the second vertical plate 8 respectively, and arrange the temperature measuring points inside the concrete mold according to the test plan. Each temperature measuring point is arranged at equal intervals and a temperature measuring line is buried;

[0027] (c) pouring the freshly mixed concrete slurry into the mold, placing the device of the present invention on a vibration table for vibration, observing the scale line on the first fixed plate 14 in real time, and continuously adding concrete slurry into the mold until the height of the designed size of the specimen is reached;

[0028] (d) adjusting the resistance heating plate 11 and the semiconductor cooling plate 6 embedded in the first fixed plate 14, the first vertical plate 13, the second vertical plate 8 and the second fixed plate 10 respectively through the temperature control system 12 so that their temperatures are designed to meet the test design temperature environment requirements, starting the temperature control system 12 to start heating or cooling, and monitoring the temperature changes at each measuring point in real time to simulate the temperature environment of the concrete during on-site construction;

[0029] (e) Two reaction bases 3 are connected by screw rods 1 and large nuts 2. Several hydraulic loading cylinders 9 are evenly distributed and fixed on the reaction bases 3 according to the size of the mold, and the other ends are respectively in contact with the first fixed plate 14 and the first vertical plate 13, so that the specimen is evenly stressed;

[0030] (f) Unscrewing the small nut 16 located on the first vertical plate 13 in the vertical plate slide rod 5, starting the pressure control system 4, and applying different degrees of early age loads to the specimen through the first fixed plate 14 and the first vertical plate 13 to simulate the external load environment of the concrete material during the construction and maintenance stage;

[0031] (g) Real-time recording of internal temperature changes of concrete during the curing stage under temperature load combination environment;

[0032] (h) After the test is completed, the pressure of the hydraulic loading cylinder 9 is released, the temperature control system 12 is turned off, the test data is saved, and the test data is sorted and analyzed.

[0033] Embodiment 2:

[0034] like Figure 1The device is an integrated device for concrete curing and early-age strength testing under a laboratory simulated temperature load combination environment, comprising a first vertical plate 13, a second vertical plate 8, a first fixed plate 14, a second fixed plate 10, a casting base 7, a first vertical plate extension block 15, a resistance heating plate 11, a semiconductor cooling plate 6, a temperature control system 12, a pressure control system 4, a large nut 2, a small nut 16, a reaction base 3, a screw 1, a hydraulic loading cylinder 9 and a vertical plate slide bar 5. The casting base 7 is connected to the first fixed plate 14 and the second fixed plate 10. The first fixed plate 14 and the second fixed plate 10 are connected to the first fixed plate 14 and the second fixed plate 10. They are all connected to the vertical plate slide rod 5 to form a whole and are fixedly connected to the first vertical plate 13 and the second vertical plate 8 through a small nut 16 to form a concrete mold. The reaction base 3, the screw 1, the large nut 2, and the hydraulic loading cylinder 9 are interconnected to form a loading system. The temperature control system 12 is connected to the temperature measuring point in the concrete mold through a temperature measuring line. The resistance heating plate 11 and the semiconductor refrigeration plate 6 are connected to the temperature control system 12 through a wire. A square groove 17 is set on one side of the first vertical plate 13, and a square convex groove 18 and a square groove 17 are respectively set on both sides of the first vertical plate extension block 15. Scale lines are set on the inner surface of the first fixed plate 14, and the first vertical plate 13, the first vertical plate extension block 15, the first fixed plate 14, the second vertical plate 8, and the second fixed plate 10 are all embedded with a resistance heating plate 11 and a semiconductor cooling plate 6. The maximum test heating temperature of the resistance heating plate 11 is 100°C, and the minimum test temperature of the semiconductor cooling plate 6 is -20°C. The first vertical plate 13, the second vertical plate 8, the first fixed plate 14, the second fixed plate 10, the casting base 7, and the first vertical plate extension block 15 are made of Q275 steel material, and the side length of the square groove 17 and the square convex groove 18 is 15mm.

[0035] The specific steps are as follows:

[0036] (a) According to the concrete specimen size determined in the test plan, the size of the concrete mold is adjusted to the required size by adjusting the second vertical plate 8 and adding a plurality of first vertical plate extension blocks 15 to the first vertical plate 13;

[0037] (b) Tighten the small nuts 16 to fix the first vertical plate 13 and the second vertical plate 8 respectively, and arrange the temperature measuring points inside the concrete mold according to the test plan. Each temperature measuring point is arranged at equal intervals and a temperature measuring line is buried;

[0038] (c) pouring the freshly mixed concrete slurry into the mold, placing the device of the present invention on a vibration table for vibration, observing the scale line on the first fixed plate 14 in real time, and continuously adding concrete slurry into the mold until the height of the designed size of the specimen is reached;

[0039] (d) adjusting the resistance heating plate 11 and the semiconductor cooling plate 6 embedded in the first fixed plate 14, the first vertical plate 13, the second vertical plate 8 and the second fixed plate 10 respectively through the temperature control system 12 so that their temperatures are designed to meet the test design temperature environment requirements, starting the temperature control system 12 to start heating or cooling, and monitoring the temperature changes at each measuring point in real time to simulate the temperature environment of the concrete during on-site construction;

[0040] (e) Two reaction bases 3 are connected by screw rods 1 and large nuts 2. Several hydraulic loading cylinders 9 are evenly distributed and fixed on the reaction bases 3 according to the size of the mold, and the other ends are respectively in contact with the first fixed plate 14 and the first vertical plate 13, so that the specimen is evenly stressed;

[0041] (f) Unscrewing the small nut 16 located on the first vertical plate 13 in the vertical plate slide rod 5, starting the pressure control system 4, and applying different degrees of early age loads to the specimen through the first fixed plate 14 and the first vertical plate 13 to simulate the external load environment of the concrete material during the construction and maintenance stage;

[0042] (g) Real-time recording of internal temperature changes of concrete during the curing stage under temperature load combination environment;

[0043] (h) When the designed curing period (1 day, 3 days, 7 days) is reached, the early age strength test of concrete is carried out, and the pressure control system 4 is adjusted to load the specimen to failure to obtain the strength index;

[0044] (i) After the test is completed, the pressure of the hydraulic loading cylinder 9 is released, the temperature control system 12 is turned off, the test data is saved, and the test data is sorted and analyzed.

[0045] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. An integrated device for concrete curing and early-age strength testing under a laboratory simulated temperature load combination environment, comprising a first vertical plate, a second vertical plate, a first fixed plate, a second fixed plate, a casting base, a first vertical plate extension block, a resistance heating plate, a semiconductor refrigeration plate, a temperature control system, a pressure control system, a large nut, a small nut, a reaction base, a screw rod, a hydraulic loading cylinder and a vertical plate slide rod, wherein the casting base is connected to the first fixed plate and the second fixed plate, the first fixed plate and the second fixed plate are both connected to the vertical plate slide rod to form a whole and are fixedly connected to the first vertical plate and the second vertical plate through a small nut to form a concrete mold, and the reaction base, the screw rod, the large nut and the hydraulic loading cylinder are mutually connected to form a curing mold. The load system is configured to: a temperature control system connected to a temperature measuring point in the concrete mold through a temperature measuring line, the resistance heating sheet and the semiconductor cooling sheet are connected to the temperature control system through a wire, a square groove is arranged on one side of the first vertical plate, a square convex groove and a square groove are arranged on both sides of the first vertical plate extension block, a scale line is arranged on the inner surface of the first fixed plate, the first vertical plate, the first vertical plate extension block, the first fixed plate, the second vertical plate, and the second fixed plate are all embedded with resistance heating sheets and semiconductor cooling sheets, the resistance heating sheets and the semiconductor cooling sheets are arranged alternately, the maximum test heating temperature of the resistance heating sheet is 100°C, and the minimum test temperature of the semiconductor cooling sheet is -20°C.

2. The integrated device for concrete curing and early-age strength testing under laboratory simulated temperature and load combination environment according to claim 1, characterized in that: The first vertical plate, the second vertical plate, the first fixed plate, the second fixed plate, the casting base and the first vertical plate extension block are all made of Q275 steel material. The dimensions of the second vertical plate, the first fixed plate, the second fixed plate and the casting base are 300mm long × 300mm wide × 25mm thick. The dimensions of the first vertical plate and the first vertical plate extension block are 300mm long × 100mm wide × 25mm thick. The end face diameter of the hydraulic loading cylinder is 75mm, and the side length of the square groove and square convex groove is 10mm.

3. The integrated device for concrete curing and early-age strength testing under laboratory simulated temperature and load combination environment according to claim 1, characterized in that: The end diameter of the hydraulic loading cylinder is 75 mm, and the maximum loading pressure of the pressure control system can reach 500 kN.

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