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Intelligent concrete test block and its producing and use

A concrete test block, intelligent technology, applied in the direction of clay preparation device, test sample preparation, manufacturing tools, etc., can solve problems such as unstable resistivity, carbon fiber cannot be dispersed, test block conductivity decline, etc., to achieve rapid growth , the test data is stable and the effect of repeatability is strong

Inactive Publication Date: 2005-10-19
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

[0003] In view of the above situation, the object of the present invention is to provide an intelligent concrete test block and its production and application, so that it can not only overcome the defect of the test block's electrical conductivity decline, but also solve the problem that the carbon fiber cannot be dispersed, and can also replace the unstable concrete test block. Method for monitoring resistivity

Method used

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  • Intelligent concrete test block and its producing and use
  • Intelligent concrete test block and its producing and use
  • Intelligent concrete test block and its producing and use

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Embodiment Construction

[0040] In conjunction with accompanying drawing and chart, embodiment of the present invention is as follows:

[0041] One, the intelligent concrete test block of the present invention.

[0042] 1. The choice of ingredients. First select the carbon fiber raw material. In this embodiment, the PAN-based carbon fiber produced by a certain company is selected. Its physical and chemical properties can be seen from the physical and chemical properties table in Figure 2. The fine powder admixture is composed of 1% cement, 0.12-0.145% fly ash, and 0.12%-0.199% slag or silica fume. Among them, this embodiment adopts two different admixture ratio schemes, slag It is the granulated blast furnace slag of a certain Iron and Steel Group Co., Ltd. After drying and ball milling, the fineness of ball milling is 0.08mm sieve, the sieve allowance is 10.5%, and the loose bulk density after grinding is 1.41g / cm 3 , and its chemical composition is shown in Figure 3. During the proportioning proc...

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Abstract

The present invention discloses intelligent concrete test block and its making and application. The present invention makes the test block with carbon fiber, fine material powder and coarse aggregate through a two stage and three time process or a twice drying step and one wet step stirring process and uses capacitance as electric performance test parameter. The said technological scheme makes the test block possess sensitive reaction to compression stress, stable test data, fast capacitance increment with stress increment at low stress state and linear capacitance increment at stress over 4 MPa, and stable piezoelectric performance, high repeatability. The present invention is suitable for detection of stress in building structure.

Description

technical field [0001] The invention relates to a concrete test block, in particular to an intelligent concrete test block containing carbon fiber and its production and application. Background technique [0002] At present, traditional cement-based composite materials are mainly used for the mechanical properties of building load-bearing materials to be used for automatic monitoring of expressways and weighing in motion, large structures such as nuclear power plant facilities, micro-cracks of dams and seepage of dams. Monitoring for leakage etc. This ground-breaking development is largely along the lines of engineeringly exploitable changes in the electrical resistivity of carbon fiber-containing concrete products. And this change will endow concrete with new special functions. For example, carbon fibers of different qualities can be added to concrete, which can be configured to conduct electricity, shield magnetic field, shield electric field radiation and stress, strain ...

Claims

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Application Information

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IPC IPC(8): B28B1/08B28B11/24B28C5/00C04B14/38C04B18/04C04B28/04G01N1/28G01N27/22
CPCY02W30/91
Inventor 刘锡军凌敏
Owner HUNAN UNIV OF SCI & TECH
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