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Concrete automatic impact tester and test method thereof

A test method and technology for concrete specimens, applied in the direction of applying repetitive force/pulse force to test the strength of materials, etc., can solve the problems of low efficiency, easy deformation and scrapping of steel balls, etc., to improve service life, high test efficiency, and complete reduction The effect of the number of times of destruction

Active Publication Date: 2011-08-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims to solve the problems of low efficiency and easy deformation and scrapping of steel balls existing in the current concrete impact resistance performance tester, and provides a high-efficiency automatic concrete impact tester and its testing method

Method used

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  • Concrete automatic impact tester and test method thereof
  • Concrete automatic impact tester and test method thereof
  • Concrete automatic impact tester and test method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An automatic impact tester for concrete, comprising a specimen base 1, an external frame 11 is installed on the base 1, an impact hammer guide rod 6 is vertically erected inside the external frame 11, and the lower end of the impact hammer guide rod 6 Connected with an impact transmission device 2, the impact transmission device 2 is a rod-shaped device with a hemisphere at one end and a cylinder at the other end, the hemispherical end of which is in contact with the test piece; the impact hammer 4 is set on the impact hammer guide rod 6, so The impact hammer 4 is fixed on the top of the impact transmission device 2 through the impact hammer suspension mechanism 5 and contacts with its cylindrical end surface; the impact hammer 4 is equipped with an impact hammer lifting device 8, and the impact hammer lifting device 8 is fixed on the transmission device 7, the transmission device 7 is fixed in the outer frame 11 and connected with a control device 10; the impact hammer ...

Embodiment 2～5

[0039] Use PO52.5 cement, 5-10mm gravel, natural medium sand (fineness modulus 3.0), steel fiber (S f) and naphthalene series high-efficiency water reducer (FDN) to prepare fiber concrete. The concrete mix ratio is shown in Table 1. After mixing and molding and curing for 28 days, the concrete automatic impact tester prepared in Example 1 was used to test. For fiber concrete, stop once every 10 impacts to check the cracking of the concrete specimen. For concrete mixed with steel fibers, stop once every 25 impacts to check the cracking of the concrete specimen. 1. It can be seen from Table 1 that when the strength of concrete increases, its impact resistance also increases, but the number of first crack impacts is very close to the number of failure impacts, indicating that concrete without steel fibers does not have crack resistance. After the addition of steel fibers, the impact resistance of concrete is greatly improved, and the number of first-crack impacts and damage impa...

Embodiment 6

[0043] The difference between this embodiment and Embodiment 1 is that: the distance between the impact hammer ejection device 9 and the impact transfer device 2 is 1000mm; in the test method adopted, for concrete without steel fibers, step (2) The preset number of impacts in is 5; for concrete mixed with steel fibers, the steps

[0044] The preset number of impacts in (2) is 25 times.

[0045] This example takes PO42.5 cement, 5-10mm gravel, natural medium sand (fineness modulus 2.60), polypropylene fiber (PF) and naphthalene-based high-efficiency water reducer (FDN) to prepare fiber concrete as an example. The concrete mix ratio is C: W: S: G: FDN: PF = 1: 0.45: 1.95: 2.44: 0.01: 0.0075. After mixing and curing for 28 days, the concrete automatic impact tester is used to test the parameters. When setting, stop once every time there are 5 impacts, and finally measure the number of first-crack impacts as 25 times and the number of destructive impacts as 55 times. It can be s...

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Abstract

The invention relates to a concrete automatic impact tester, which comprises a test-piece base. A n external frame is arranged on the base; an impact hammer guide rod is erected vertically in the external frame; an impact action transfer device is connected to the lower end of the impact hammer guide rod; the impact action transfer device is a rod-shaped device of which one end is a hemisphere and the other end is a cylinder, and the hemispherical end of the rod-shaped device contacts test pieces; an impact hammer is sleeved on the impact hammer guide rod; the impact hammer is fixed above theimpact action transfer device through an impact hammer suspension gear to contact the cylindrical end face of the impact action transfer device; an impact hammer lifting device is arranged on the impact hammer; the impact hammer lifting device is fixed on a transmission device; the transmission device is fixed in the external frame and is connected with a control device; and an impact hammer take-off device is arranged on the impact hammer guide rod. The concrete automatic impact tester has the advantages that: (1) the number of times of observing the incipient crack and complete damage of concrete is reduced, and the test efficiency is high; and (2) the service life of the impact action transfer device is prolonged greatly.

Description

technical field [0001] The invention relates to an automatic concrete impact tester and a test method thereof, belonging to the technical field of concrete material testing. Background technique [0002] The impact resistance of concrete is an important indicator to measure the mechanical properties of concrete, especially high-toughness concrete. However, there is no standard test method for the impact resistance of concrete in China. Usually, the laboratory uses ACI-544 "fiber concrete" recommended by the American Concrete Institute. According to the performance test method of the "Performance Test Method", the method stipulates that the impact hammer with a mass of 4.45kg falls freely from a height of 457mm or 1000mm, and the impact is transmitted through a steel ball with a diameter of 63.5mm. The impact thickness is 64mm, For concrete specimens with a diameter of 150 mm, record the number of impacts when the surface of the specimen begins to produce visible cracks and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/34
Inventor 孔德玉姜俊王晓栋
Owner ZHEJIANG UNIV OF TECH
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