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Method for detecting elastic modulus of concrete material in reinforced concrete member

A material elastic modulus, reinforced concrete technology, applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems such as inaccurate building structure safety, differences in static elastic modulus, and potential safety hazards

Active Publication Date: 2015-02-11
四川升拓检测技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 1. The difference between dynamic and static elastic modulus;
[0007] 2. The wave speed obtained by different test methods is different;
[0008] 3. Influence of Rebar on Test Results
Therefore, it is inaccurate to use this result as the elastic modulus of concrete materials to evaluate the safety of civil engineering and building structures, and there are potential safety hazards.

Method used

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  • Method for detecting elastic modulus of concrete material in reinforced concrete member
  • Method for detecting elastic modulus of concrete material in reinforced concrete member
  • Method for detecting elastic modulus of concrete material in reinforced concrete member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] In this embodiment, the size of the reinforced concrete member is 0.2m×0.2m×1m, the stirrup is D10, the spacing is 200mm, and the longitudinal reinforcement is 4×D20.

[0096] 1. Wave speed detection steps:

[0097] The double-sided penetration method is used for the detection of reinforced concrete members, as follows: image 3 shown. The thickness of the reinforced concrete member 1 is known, and its thickness is H=1m, and there are spaces on both sides where testing instruments can be placed. An impact hammer 2 is arranged on one side of the reinforced concrete member 1, and a sensor 4 is arranged on the other side of the reinforced concrete member 1, and the impact hammer 2 and the sensor 4 are arranged oppositely. The impact hammer 2 excites the side of the reinforced concrete member 1 to generate an impact elastic wave, which propagates to the other side and is received by the sensor 4 . get as Image 6 The waveform curve of the shock elastic wave propagating...

Embodiment 2

[0120] test using figure 2 The modulus of elasticity of reinforced concrete members for the one-sided propagation method shown The calculation formula is: , while the modulus of elasticity of the concrete material in the reinforced concrete member The calculation method is exactly the same as in Example 1.

Embodiment 3

[0122] test using figure 1 The one-sided reflection method shown carries out the detection of the modulus of elasticity of the concrete material in the reinforced concrete member.

[0123] In this embodiment, the reinforced concrete member is a one-way slab of 3m×3m×0.1m, and the longitudinal reinforcement is a single row of D20 with a spacing of 0.2m.

[0124] 1. Wave speed detection steps:

[0125] The single-sided reflection method is used to detect the reinforced concrete members, specifically as figure 1 shown. Thickness of reinforced concrete member 1 It is known that it is 0.1m. The hammer 3 is used to excite the upper surface of the reinforced concrete member 1 to generate a shock elastic wave, which propagates to the lower surface of the reinforced concrete member 1 and is reflected back to the upper surface of the reinforced concrete member 1, and is located on the reinforced concrete member 1 The sensor 4 (generally an acceleration sensor) can be used to rece...

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Abstract

The invention discloses a method for detecting an elastic modulus of a concrete material in a reinforced concrete member. The method comprises the steps of wave velocity detection: detecting the transmission velocity of an impact elastic wave in the reinforced concrete member by one of a single-surface reflection method, a single-surface transmission method, a double-surface transmittance method or a surface wave method; elastic modulus calculation: calculating a movable tangent elastic modulus of the reinforced concrete member according to the transmission velocity of the impact elastic wave in the reinforced concrete member; correction: correcting the movable tangent elastic modulus of the reinforced concrete member to obtain a static elastic modulus of the concrete material in the reinforced concrete member. The method disclosed by the invention has the advantages that by the adding of the correction step for eliminating the influence of rebars on the detection of the elastic modulus, the elastic modulus of the concrete material is obtained, so that the safety of a construction / building structure is accurately evaluated.

Description

technical field [0001] The invention relates to the field of civil engineering and construction, in particular to a method for detecting the elastic modulus of concrete materials in reinforced concrete components. Background technique [0002] Reinforced concrete structure is the most important civil and architectural structure, and occupies a pivotal position in social infrastructure. However, in the process of use, various aging and deterioration phenomena (such as cracks, reduction of concrete strength, etc.) will inevitably appear. At the same time, if the construction quality is not well guaranteed, it will accelerate the deterioration of the structure, resulting in social and economic losses. [0003] There are many indicators to evaluate the quality of concrete, but the most important indicators are its axial compressive strength and elastic modulus. Among them, the axial compressive strength is generally measured by a cubic standard specimen, the concept is clear, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
Inventor 吴佳晔吴曾炜
Owner 四川升拓检测技术股份有限公司
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