Device for testing different cracking conditions of interior of cement-based material and method

A cement-based material and test piece technology, applied in the direction of material resistance, can solve the problem of difficult detection of deep internal defects in concrete

Active Publication Date: 2013-03-27
BEIJING UNIV OF TECH
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of infrared penetration ability, it is difficult to detect the internal defects in the deep layer of concrete

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Device for testing different cracking conditions of interior of cement-based material and method
  • Device for testing different cracking conditions of interior of cement-based material and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] In order to verify that AC impedance spectroscopy can be used to test different cracking conditions inside cement-based materials, the test specimens of cement paste and fly ash cement paste were selected in the test, and the water-cement ratio was 0.3 and 0.35 respectively. Four levels of load are applied inside, and the test is carried out in accordance with the following steps in conjunction with the attached drawings.

[0023] 1. Make 2 identical groups and each group has 4 standard cement-based material specimens 1 with a size of 40×40×160mm. The specimen numbers and mix design are shown in Table 1. Cured in a water bath for 3 days according to the standard method, then took it out, and wiped the surface of the specimen with a dry and clean rag. The first group of specimens were wrapped and sealed with plastic film around them, and the flexural strength of the second group of specimens was measured in parallel.

[0024] 2. Fix each test piece 1 in the second group...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a device for testing different cracking conditions of the interior of a cement-based material and a method, belonging to the testing field of a building material. The testing method comprises the following steps: the periphery of a cement-based material test specimen (1) with the standard size of 40*40*160mm is wrapped and sealed by a plastic film and fixed in an anti-fracture testing machine (2); two stainless steel electrodes (3) are respectively fixed on two opposite 40*40mm parallel surfaces of the test specimen (1); and the two stainless steel electrodes (3) and a constant potential rectifier are respectively connected by a working electrode (5) and a reference electrode (6). During testing, the anti-fracture testing machine (2) applies different grades of bending loads to the test specimen (1) so as to lead the test specimen (1) to reach different cracking conditions and complete a test procedure of the alternating current impedance spectroscopy of the constant potential rectifier (4); and impedance parameters collected by a computer (7) are used for reflecting different cracking conditions of the interior of the cement-based material. The testing method can rapidly and accurately reflect different cracking conditions of the interior of the cement-based material and is simple and practical.

Description

technical field [0001] The invention belongs to the technical field of building material detection. It is a device and method for testing different cracking conditions inside cement-based materials. Background technique [0002] Cracks are one of the common defects of cement concrete, which are very harmful to buildings, especially internal cracks, which are relatively hidden and more harmful. However, the currently commonly used non-destructive testing methods can only detect cracks in a relatively shallow range (20cm-30cm), and the range is limited, and so far there is no method that can achieve real-time monitoring and study the dynamic changes of crack defects in concrete. [0003] At present, the commonly used detection methods are: ultrasonic detection, radar detection, optical fiber sensing detection, impact echo method and infrared imaging method, etc. Different methods have different problems. [0004] 1) Ultrasonic method. It is the relative change of parameter...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/20
Inventor 李悦随春娥李学辉
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap