Nondestructive measurement method for water content of roller-compacted concrete

A technology of roller compacted concrete and measurement method, which is applied to measuring devices, instruments, material analysis by electromagnetic means, etc., can solve problems such as low work efficiency, long work cycle, radioactive pollution, etc., and achieve high work efficiency and high resolution. Effect

Inactive Publication Date: 2017-06-30
HOHAI UNIV
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Problems solved by technology

[0004] The traditional method of measuring the moisture content of RCC, such as direct sampling and drying, the traditional sampling and drying method to investigate the moisture content of RCC has a long working cycle, high cost, great destructiveness and discontinuous detection, which seriously af

Method used

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  • Nondestructive measurement method for water content of roller-compacted concrete
  • Nondestructive measurement method for water content of roller-compacted concrete
  • Nondestructive measurement method for water content of roller-compacted concrete

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Embodiment 1

[0019] The non-destructive measurement process of the moisture content of the roller compacted concrete described in this embodiment is as follows: figure 1 As shown, the specific measurement method is as follows:

[0020] The dielectric constant of the upper and lower surface layers of RCC is obtained through the electromagnetic reflection intensity, and then the moisture content is obtained by calculating the dielectric constant; the relationship between the dielectric constant and the moisture content is:

[0021]

[0022] In formula (1), is the water content, ε is the dielectric constant, b, a 1 , a 2 , a 3 is a coefficient, which is determined according to different concrete mix ratios.

[0023] The relational expression of described reflection intensity and dielectric constant is:

[0024]

[0025] In formula (2), A 0 is the reflection intensity of RCC surface, A s is the reflection intensity of the iron plate surface, and ε is the dielectric constant.

[...

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Abstract

The invention discloses a nondestructive measurement method for water content of roller-compacted concrete. According to the method, dielectric constants of an upper surface layer and a lower surface layer of the roller-compacted concrete are acquired according to electromagnetic reflection strength, and the water content is calculated on the basis of the dielectric constants. Compared with the prior art, the nondestructive measurement method has the advantages as follows: (1), surface reflection strength of the upper layer and the lower layer of the roller-compacted concrete is measured with a ground penetrating radar technology, the dielectric constants of the upper layer and the lower layer of the concrete are calibrated by means of the reflection strength, and the water content of the upper layer and the lower layer of the concrete is predicated according to the dielectric constants, and the method has the characteristics of rapidness and accuracy and can realize overall control on construction quality of the roller-compacted concrete to the greatest extent; (2), the measurement method has the advantages of high working efficiency, high resolution ratio, nondestructive performance and the like.

Description

technical field [0001] The invention belongs to the technical field of hydraulic structure detection, and relates to a method for measuring the moisture content of roller compacted concrete, in particular to a method for rapidly and nondestructively measuring the moisture content of roller compacted concrete based on ground penetrating radar technology. Background technique [0002] Roller compacted concrete is a kind of dry hard concrete with poor cement. It is mixed with water, cement, admixture, admixture, fine aggregate and graded and controlled coarse aggregate to make dry hard concrete without slump. It is mainly used for pouring concrete dam. Roller compacted concrete not only has the characteristics of small size, high strength, good self-defense performance, and overflow, but also has the advantages of simple, fast, economical construction procedures and the use of large general-purpose machinery. [0003] Roller compacted concrete is an important building material...

Claims

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Application Information

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IPC IPC(8): G01N27/22
CPCG01N27/223
Inventor 许军才田正宏沈振中
Owner HOHAI UNIV
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