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Apparatus and method for measuring pumpability of highly fluid concrete
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A technology of concrete and high flow state, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., and can solve problems such as measurement error, limited pressure measurement range, and inability to accurately control
Active Publication Date: 2020-06-05
SHANGHAI CONSTRUCTION GROUP
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[0004] Aiming at the problem that the existing rotary rheometer can only indirect calculation when measuring the pumpability of high-flow concrete, and the measurement results have errors, and the sliding tube friction meter simulates the flow of concrete in the pump pipe. The measurement range of speed and pressure is limited and cannot be accurately controlled. The present invention provides a device and method for measuring the pumpability of high-fluid concrete, which can convert the relationship between torque and rotation number under the experimental conditions of fresh concrete into Provide a scientific basis for the pumping flow in actual pumping conditions, the pumping pressure required by the pump, and the pumping pressure-pumping flow curve for concrete pumping construction
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Embodiment 1
[0051] see figure 1 , this embodiment provides a device for measuring the pumpability of high-fluid concrete, including: a base 1, a circular base 2, a motor 3, a support frame 4, a torque sensor 5, a container 6, a blade-type rotor 7, Transparent cover plate 8, speedometer 9.
[0052] Such as figure 1 As shown, the base 1 is used to fix the circular base 2 and the support frame 4 . The circular base 2 is arranged on the base 1 and can rotate along the axis. A groove is arranged in the middle, and an internal thread is arranged in the groove. The motor 3 is connected with the circular base 2 and can drive the circular base 2 to rotate. As an example, the base 1 is provided with a cavity for accommodating the motor 3, the motor 3 is located in the cavity of the base 1, and is fixedly connected to the axis of the circular base 2 through a transmission shaft.
[0053] The support frame 4 includes a vertical bar 4a and a cross bar 4b, the bottom of the vertical bar 4a is suppo...
Embodiment 2
[0065] This embodiment provides a method for measuring the pumpability of high fluid concrete using the device in Embodiment 1, combined below Figure 1 to Figure 7 This method is further explained. The method specifically includes the following steps:
[0066] S1. If figure 1 As shown, a device for measuring the pumpability of high-fluid concrete is provided, and the fresh concrete is poured into the container 6 and covered with a transparent cover plate 8 .
[0067] S2. If figure 2 As shown, start the motor 3 to drive the circular base 2 and the container 6 to rotate at a certain speed N, and the linear velocity at the tube wall of the container 6 is v 0 = 2πNr o ;
[0068] S3. If image 3 As shown, until the concrete rotates stably, at radius r i ≤ro In the region, a plug flow region (r i ≤rp ), shear region (r p ≤rS ) and lubricating layer r S ≤ro , respectively measure the radius r at the boundary of the plug flow zone and the shear zone p And the radius r at ...
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Abstract
The invention relates to a device and a method for measuring pumpability of high-flow-state concrete. The device comprises a pedestal, a round base, a motor, a supporting frame, a torque sensor, a container, a speed measuring instrument, a fan blade type rotor and a transparent cover plate, wherein the motor can drive the round base and the container to rotate; the torque sensor can measure the action torque, acting on the fan blade type rotor, of concrete in the container; the speed measuring instrument can measure tangential speed distribution of the concrete in the container in a radius direction, so that the flow Q of the concrete in the actual pumping work condition and the total pressure P which a pump machine needs to output are calculated through related formulas, a P-Q curve is drawn and the pumping work is guided. By the method, the torque and revolution relationship (namely T-N) under the newly mixed concrete experiment working condition is converted into the pumping flow inthe actual pumping working condition and the pumping pressure (P-Q) needed by the pump machine, and scientific basis is provided for concrete pumping construction through the pumping pressure-pumpingflow curve.
Description
technical field [0001] The invention relates to a device and a method for measuring the pumpability of high-fluid concrete, belonging to the technical field of construction engineering. Background technique [0002] In the field of engineering and construction, the transportation of fresh concrete is an important link in the construction of structures. Modern pumping equipment and technology have significantly improved the efficiency of concrete delivery, so they are widely used in large-scale projects. In the field of large-scale projects such as super-high building construction, accurate evaluation of the "pumpability" (pumping flow rate - pumping pressure) of concrete mixtures is the prerequisite for formulating pumping construction plans. However, the calculation formulas in the current industry standards are mainly for traditional low-flow concrete (slump below 150mm). With the development and change of concrete performance and engineering complexity, especially the i...
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