Abstract
Comprehensive microstructural investigations were performed on normal-strength (33 MPa) and relatively high-strength concrete (43 MPa) as well as concrete specimens with and without restraint against drying shrinkage movement. The effects of different load and environmental damaging phenomena (cold and hot environment) on concrete microcrack system were detected. Fluorescent and environmental scanning electron microscopy (ESEM) techniques with image analysis methodologies were employed to quantify microcrack attributes on planar sections. Stereological aspects were used to derive information on spatial (3-D) microcrack systems in terms of planar (2-D) quantitative data generated on perpendicular sections. Statistical analysis of data was used to determine the differences in microcrack characteristics between normal-strength versus relatively high-strength and unrestrained versus restrained specimens.
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