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Elastic modulus measuring method and device for flexible concrete with strength of 1-5MPa

A flexible concrete and elastic modulus technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems that flexible concrete cannot be fully reflected, the elastic modulus cannot be accurately calculated, and the preloading operation is difficult to master. To achieve the effect of easier mastery, wide application range and convenient transportation

Inactive Publication Date: 2014-12-03
WATER RESOURCES RES INST OF SHANDONG PROVINCE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0034] The problems in the above elastic modulus testing method and device are as follows: (1) the test process needs to be repeatedly preloaded, which is not suitable for flexible concrete with a strength as low as 1-5MPa, and the flexible concrete specimen is easily damaged in the process of repeated preloading. And the preloading operation is not easy to master; (2) The measurement gauge length is a part of the specimen, which cannot fully and truly reflect the deformation of flexible concrete; (3) For flexible concrete, because its maximum stress is small (1MPa~5MPa), so More often, the maximum stress of 0.4 (0.4MPa~2MPa) or 1 / 3 of the maximum stress (0.3MPa~1.67MPa) is even lower than 0.5MPa, and the elastic modulus cannot be accurately calculated by using the above elastic modulus test method and device. quantity

Method used

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  • Elastic modulus measuring method and device for flexible concrete with strength of 1-5MPa
  • Elastic modulus measuring method and device for flexible concrete with strength of 1-5MPa
  • Elastic modulus measuring method and device for flexible concrete with strength of 1-5MPa

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Embodiment 1

[0064] Such as figure 1 As shown, a flexible concrete modulus of elasticity measuring device includes an axial press frame, and the axial press frame is composed of a base 1, a column 2 connected to the base 1, and a crossbeam 3 positioned at the upper end of the column 2; The axial force measuring device 4 is located in the axial pressure frame, and one end of the axial force measuring device 4 is connected with the crossbeam 3 of the axial pressure frame, and the other end is connected with the upper pressure plate 5; the upper pressure plate 5 is connected with the lower pressure plate An axial displacement meter 8 is connected between the pressure plates 7, and a runner 9 is provided on the base 1 of the axial pressurization frame, and the lower transmission pressure plate 7 and the runner 9 pass through the conical shaft located in the base 1 of the axial pressurization frame. The gear transmission connection realizes the lifting of the lower transmission pressure plate 7...

Embodiment 2

[0083] Comparative Test:

[0084] The maximum stress of the flexible concrete specimen to be tested is 1.13MPa, and the maximum stress of 0.4 times or 30% of the maximum stress is less than 0.5Mpa. The calculation method of elastic modulus in GB50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", SL352-2006 "Test Regulations for Hydraulic Concrete", and DL5150-2001 "Test Regulations for Hydraulic Concrete" cannot be obtained correctly. Elastic modulus data.

[0085] According to the method of the present invention, the stress-strain relationship graph obtained is as follows image 3 As shown, calculate according to Ec=(ΔP / A)×(L / ΔL), the result is as follows:

[0086] Ec=(1.12-0.2)×(150 / 0.65-0.044)=228MPa

[0087] Calculated according to the calculation method of elastic modulus in GB50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", SL352-2006 "Test Regulations for Hydraulic Concrete", and DL5150-2001 "Test...

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Abstract

The invention discloses an elastic modulus measuring method and device for flexible concrete with the strength of 1-5MPa. The device comprises an axial pressurizing frame, wherein the axial pressurizing frame is connected with an axial auxiometer; the axial auxiometer is connected with an upper pressure transferring plate; an axial displacement meter is connected between the upper pressure transferring plate and a lower pressure transferring plate; the lower pressure transferring plate is in transmission connection with a conical gear of a rotating wheel, so as to enable the lower pressure transferring plate to be lift up and down. The invention further discloses the elastic modulus measuring method for the flexible concrete with the strength of 1-5MPa. In the method, the device is adopted. Compared with a large-scale universal experimental machine and an experimental method of the large-scale universal experimental machine, the elastic modulus measuring device is simple to operate, relatively high in accuracy, and convenient to transport and can be rapidly applied to construction site operation; the experimental theory is based on the Hooke law; according to a stress-strain relation curve chart, the stress value at a starting point of a straight section and the slope of a stress-strain curve are taken as the elastic modulus; compared with other methods, for the method disclosed by the invention, no repeated pre-pressurizing operation is needed; elements to be tested are not damaged because of pre-pressurizing; the method is easy to master and suitable for measuring the elastic modulus of the flexible concrete with the low strength (1-5MPa).

Description

technical field [0001] The invention relates to a method and device for measuring the elastic modulus of flexible concrete with a strength of 1-5 MPa. Background technique [0002] Concrete is an important building material in major factories such as industry, national defense, civil construction, bridges, tunnels and power stations. The precise test of the mechanical properties of concrete, and the quantitative method to scientifically detect the quality of building raw materials, structural components and processed semi-finished products, It is the key to ensure the quality of construction projects. Elastic modulus is an important mechanical property of concrete. It reflects the relationship between the stress and strain of concrete. It is one of the parameters necessary to calculate the deformation of reinforced concrete structures, crack development and temperature stress of mass concrete. [0003] At present, the methods for determining the modulus of elasticity of con...

Claims

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Application Information

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IPC IPC(8): G01N3/08
Inventor 许尚杰王飞杨萌张禾朱传磊刘珊文张爱民张广贞
Owner WATER RESOURCES RES INST OF SHANDONG PROVINCE
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