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Measurement of water sorption and desorption in granite blocks
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
2005 (English)Report (Other academic)
Place, publisher, year, edition, pages
2005. , 26 p.
Series
Trita-IIP, ISSN 1650-1888 ; 2005:07
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
URN: urn:nbn:se:kth:diva-8967OAI: oai:DiVA.org:kth-8967DiVA: diva2:14476
Note
QC 20101222Available from: 2005-12-27 Created: 2005-12-27 Last updated: 2010-12-22Bibliographically approved
In thesis
1. Development of techniques for measurements of shock wave response and moisture content in granite
Open this publication in new window or tab >>Development of techniques for measurements of shock wave response and moisture content in granite
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

For measuring small, fast deformations on a micrometre scale optical methods are common. Various forms of interferometry are available, and holography is another possibility. However, if there are complications such as limited space and hazardous environments special demands arise. In our case a granite block was subject to a detonation from a small explosive charge, sending shock waves through the block. In some cases there was risk of expulsion with flying rock shards, with possible damage to expensive optics. Therefore a robust solution with no expensive, fragile parts near the test surface was needed.

A fast four-channel fibre-optic sensor for measuring dynamic surface displacements was developed. Light from an LED is sent through a plastic optic fibre and reflected from the observed surface back into the fibre. A photodetector is used to measure the intensity of the reflected light, which gives the distance to the surface. Based on simple principles, micrometre and microsecond resolution was achieved. The only parts near the test surface were the fibres, easy to replace.

The sensor was used for measuring the propagation velocity of the shock wave, the surface displacement and its particle velocity. One of the most important factors for the wave transmission in granite is the water content of the rock material. The pores in the granite allow for about 0.1% of the granite’s weight to come from liquid water. This is enough to affect the aforementioned measured quantities, from a few percent in some cases to over 100% in other cases. Therefore an investigation was undertaken aiming to control the water content of the granite blocks. Several series of small blocks were both soaked in water and dried, the water content measured with a high performance balance, to ensure well-controlled blasting experiments.

On a larger scale, the aim with the project of which this thesis is a part was to gain systematic knowledge on the effects of penetrating weapons on granite rock shelters. This thesis shows how the raw data was obtained, presents the data itself and exemplifies its application.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 53 p.
Series
Trita-IIP, ISSN 1650-1888 ; 05:10
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:kth:diva-573 (URN)91-7178-236-2 (ISBN)
Presentation
2005-12-09, M311, Brinellvägen 66, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101222Available from: 2005-12-27 Created: 2005-12-27 Last updated: 2010-12-22Bibliographically approved

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Citation style
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Output format
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