Title:
Mechanism of Microcrack Formation in Concrete
Author(s):
Farhad Ansari
Publication:
Materials Journal
Volume:
86
Issue:
5
Appears on pages(s):
459-464
Keywords:
concretes; cracking (fracturing); interferometers; lasers; measurement; measuring instruments; microcracking; Materials Research
DOI:
10.14359/2040
Date:
9/1/1989
Abstract:
Formation and extent of microcracks in the fracture process zone of concrete are studied by laser speckle interferometry. Main emphasis is given to detection of microcracks, measurement of the width of microcracking zone, and assessment of process zone length. Crack opening displacements measured within the process zone were substantially higher than the values conventionally measured at the crack mouth. Measured critical process zone lengths (length of the microcracking region at peak load) were found to be specimen-size dependent.