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A pressure slide tube device and evaluation method for detecting the pumpability of concrete

A technology of concrete and sliding tube instrument, which is applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of large deviation in pumpability, and achieve the effects of convenient operation, simple structure and low technical requirements.

Active Publication Date: 2021-10-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Regarding the test methods for the pumpability of fresh concrete, for a long time, qualitative methods such as slump or slump spread have been used to characterize them. There is often a large deviation in its pumpability

Method used

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  • A pressure slide tube device and evaluation method for detecting the pumpability of concrete
  • A pressure slide tube device and evaluation method for detecting the pumpability of concrete
  • A pressure slide tube device and evaluation method for detecting the pumpability of concrete

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] When the present invention is in use, first put the freshly mixed concrete to be tested into the slide pipe 2, and move the slide pipe up and down 5-10 times to form a lubricating layer between the slide pipe and the concrete. Insert the piston 5 along the central bolt tube, then insert the hollow jack 4 into the central bolt rod 3 and place it on the piston, place the backing plate 6, and finally tighten the nut. The jack is used to pressurize the fresh concrete by means of a manual oil pump. Then different counterweights are applied to make the sliding tube fall freely, the pressure data is collected by the pressure sensor, the displacement change is collected by the displacement sensor 11, and the pressure-flow relationship diagram is drawn.

[0040] In order to fully explain the implementation of the present invention, sev...

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PUM

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Abstract

The invention discloses a pressure sliding tube instrument device and evaluation method for testing the pumpability of concrete by applying pipe wall pressure. The device includes a base, a sliding tube, a central bolt rod, a piston, a hollow jack, a backing plate, a high-strength nut, a bottom plate, and a top And bottom pressure sensor, slide tube side pressure sensor, displacement sensor and data acquisition instrument. During the test, the pressure is applied by the jack to compress the concrete in the pipe. The compression and expansion of the concrete will cause different lateral pressures on the pipe wall, so that the slide pipe will fall freely. The data is collected by the data acquisition instrument, and the pressure-flow curve is drawn to calculate the yield stress of the concrete lubricating layer and Plastic viscosity was used to evaluate the pumpability of concrete. The invention can truly and accurately evaluate the pumpability of concrete.

Description

technical field [0001] The invention relates to the field of concrete work performance testing, in particular to a device and an evaluation method for testing the pumpability of concrete. [0002] At present, commercial concrete is widely used in concrete, and the pumping construction method is generally used in actual projects, that is, the concrete is pumped from the delivery pipeline (pump pipe) to a height of several hundred meters through a concrete pump, especially in super high-rise pumping. Concrete is subjected to a huge pumping pressure in the pumping pipeline, usually up to 15-20MPa, which requires the concrete to have good pumpability, including good cohesion and fluidity. Therefore, it is very important to evaluate the pumpability of concrete for modern concrete construction. Therefore, the present invention is proposed, which can more accurately predict the pumpability of concrete. Background technique [0003] Regarding the test methods for the pumpability o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 李悦李亚强金彩云
Owner BEIJING UNIV OF TECH