Micro-meter measurement of cracks to compare blast and environmental effects

Charles H. Dowding, Michael Louis

Research output: Contribution to journalConference articlepeer-review


Concern over construction vibration-induced cracking has led to development of a new approach to vibration monitoring called autonomous crack measurement (ACM) and illustrated in Figure 1. This paper describes the concept as well as sensor performance in the first test house fitted an ACM system. Response of three cracks in this concrete masonry unit (CMU) house was measured as part of the system verification. ACM employs a single sensor that measures both weather-induced micrometer changes in crack width and those produced by habitation and ground motion-induced vibration. This comparison is displayed in real time via the Internet without human interaction. Graphic display through the Internet provides a new pathway for communication with the public. Such visual comparison of changes in crack width provides a simple alternative to the present system of comparison of measured and allowable vibration time histories. Measurements reported herein show that weather-induced response of cracks is greater than that caused by presently allowable construction-induced vibration.

Original languageEnglish (US)
Pages (from-to)245-261
Number of pages17
JournalProceedings of the Annual Conference on Explosives and Blasting Technique
StatePublished - Jul 21 2003
EventProceedings of the Twenty-Ninth Conference on Explosives and Blasting Technique - Nashville, TN, United States
Duration: Feb 2 2003Feb 5 2003

ASJC Scopus subject areas

  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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