Method for measuring stressed deformation of cement-base composite material

A composite material and detection method technology, applied in the direction of material resistance, using stable tension/pressure to test material strength, etc., can solve problems such as uneven shrinkage cracks, and achieve the effect of good adhesion

Inactive Publication Date: 2002-08-14
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0004] The defects of cement-based composite materials include: (1) cracks caused by uneven shrinkage during the solidification process of cement-based

Method used

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  • Method for measuring stressed deformation of cement-base composite material
  • Method for measuring stressed deformation of cement-base composite material
  • Method for measuring stressed deformation of cement-base composite material

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Experimental program
Comparison scheme
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Embodiment 1

[0093] Embodiment 1: 1, sample preparation

[0094] 1), polypropylene fine denier short fiber reinforced cement mortar

[0095] Ratio: cement: standard sand: water = 1:2.5:0.44

[0096] Dosage of polypropylene fine denier short fibers:

[0097] Polypropylene fine denier short fiber: cement mortar = 1:1000 (volume ratio)

[0098] Stirring time: cement + fiber 1.5min

[0099] Cement + fiber + standard sand + water 3min

[0100] Vibration time; 2min

[0101] The standard curing time is 24 hours, demoulding, and natural curing for 28 days.

[0102] 2), the surface of the sample is coated with a conductive film

[0103] After the cement mortar and the polypropylene fine-denier short-fiber-reinforced cement mortar are naturally cured to age, the surface of the sample is treated with conductive adhesive to form a conductive film sensor, as shown in Figure (8). Figure (8) is a schematic diagram of a mortar sample coated with a conductive film on the surface.

[0...

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Abstract

The invention relates to a method for checking and measuring the distortion of cement-based composite material caused by force. A conducting film as sensor, which is composed of short-cut carbon fiber, graphite power and adhesion agent, is coated on the surface of specimen of cement-based composite material. Circuit signal collector in bridge type is adopted in the invention. With the specimen ofcement-based composite material being forced, loaded and impacted, uneven distortion and cracking in the specimen of cement-based composite material can be detected by checking and measuring variation of voltage and current caused by the variation of resistance of said conducting film.

Description

technical field [0001] The invention relates to a detection method for stress deformation of a cement-based composite material, which belongs to the technical category of building materials. Background technique [0002] Cement-based composite materials are prepared from cement, water, sand aggregates and a little auxiliary materials. The hydration reaction of cement produces gelation, which constitutes the continuous phase of cement-based composite materials, and coagulates sand and gravel aggregates and auxiliary materials together to form a solid artificial stone. It is currently the largest and most widely used building material. [0003] According to the different aggregates used, cement-based composite materials can be divided into two categories: cement mortar and concrete: cement mortar is mainly prepared from cement, water and fine aggregate (sand); the preparation of concrete also needs to include coarse aggregate, that is, sand stone. Although ordinary cement-b...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N27/04
Inventor 王家君王笃金赵莹周勇胡先波徐端夫
Owner INST OF CHEM CHINESE ACAD OF SCI
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