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Device and method for testing contact stress of fresh concrete

A technology of contact stress and testing device, applied in the direction of measuring device, measuring force, instrument, etc., to achieve the effect of ensuring accuracy, convenient use, and simple calculation of contact stress

Active Publication Date: 2021-04-13
红河州元蔓高速公路投资建设开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of accurately testing the contact stress of fresh concrete, and propose a device and method for testing the contact stress of fresh concrete

Method used

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  • Device and method for testing contact stress of fresh concrete
  • Device and method for testing contact stress of fresh concrete
  • Device and method for testing contact stress of fresh concrete

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Embodiment Construction

[0049] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0050] Such as figure 1 As shown, the present invention provides a device for testing the contact stress of fresh concrete, including a steel ball 1, a mechanical sensor 2, a steel plate 3, a first LVDT4, a second LVDT5, a first steel pipe 6 and a second steel pipe 7;

[0051] The steel ball 1 is movably arranged on the surface of fresh concrete, and the steel ball 1 and the mechanical sensor 2 are fixedly connected through the first steel pipe 6; the second steel pipe 7 is fixedly arranged above the mechanical sensor 2; the first LVDT4 and the second LVDT5 are respectively fixed It is arranged on both sides of the mechanical sensor 2; the two ends of the steel plate 3 are respectively fixedly connected to the first LVDT4 and the second LVDT5;

[0052] The steel ball 1 is used to simulate coarse aggregate; the second steel pipe 7 is used to transmit the...

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Abstract

The invention discloses a device and method for testing contact stress of fresh concrete. The device comprises a steel ball, a mechanical sensor, a steel plate, a first LVDT, a second LVDT, a first steel pipe and a second steel pipe; the steel ball is used for simulating coarse aggregate; the second steel pipe is used for conducting the applied load; the mechanical sensor is used for testing the load applied to the concrete; and the first LVDT and the second LVDT are both used for measuring the depth of the steel ball permeating into the fresh concrete. According to the testing device, the steel plates are placed at the tail ends of the LVDT respectively, and the situation that a needle head of the LVDT makes contact with the surface of fresh concrete, and consequently testing errors are caused is prevented. Meanwhile, the penetration depth of the aggregate into the concrete can be measured, so that the contact area of the aggregate and the concrete at any moment can be obtained. The device is simple in structure and convenient to use.

Description

technical field [0001] The invention belongs to the technical field of construction, and in particular relates to a device and a method for testing the contact stress of freshly mixed concrete. Background technique [0002] As a high-efficiency and low-cost technical method, shotcrete has been widely used in tunnel construction, slope support and underground engineering. Since the advent of shotcrete, researchers have made great progress in material properties, mix ratio optimization, and concrete shotcrete process improvement. However, during the intrusion of shotcrete aggregates into concrete, due to the viscous resistance of concrete, contact stress will be formed around the aggregates that affects the intrusion of aggregates. The contact stress refers to the stress formed around the contact between the aggregate and the concrete due to the viscous resistance of the concrete that hinders the downward penetration of the aggregate when the aggregate penetrates into the fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/00
CPCG01L1/00
Inventor 张新尚陈爽唐登志张晓龙吴昊南李福海
Owner 红河州元蔓高速公路投资建设开发有限公司
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