X‐ray Diffraction Investigations of Microstructure of Calcium Hydroxide Crystallites in the Interfacial Transition Zone of Concrete

Abstract

This work presents theoretical and experimental X‐ray diffractometry investigations of the morphology and deformation state of calcium hydroxide (Ca(OH)2, CH) crystallites in the interfacial transition zone of concrete. Based on the developed theoretical approach, the distributions of CH crystallites and their coherent domains over strains and sizes are reconstructed. The average amounts of planar defects, cracks, and possible stacking faults within a CH crystallite are estimated. A comparative analysis is conducted for the morphology of CH texture depending on the type of aggregate particles (granite and smoky quartz) used.

Exploration of Waterproofness of Concrete and Alkali-Aggregate Using Hydrophobic Impregnation and Coating

“…ITZ with lower compactness is often filled with larger crystals. Larger crystals have poor bonding ability, not only because of the weak of van der Waals' force but also because there is the tendency to form a preferred orientation layer [41].…”

A Review on Microscopic Property of Concrete’s Aggregate-Mortar Interface Transition Zone

“…At the earliest, Farran adopted optical microscope to observe the existence of the interfacial transition zone between aggregate and cement paste in cement mortar [2] . With the development of technology, fluorescence microscope, scanning electron microscope (SEM) [3], X-ray diffraction (XRD) [4], mercury intrusion method (MIP) [5], infrared spectroscopic analysis, acoustic emission technique (AE) [6], AC impedance spectroscopy method (ACIS) [7], nuclear magnetic resonance method (NMR), CT test method [8], differential thermal analysis (DTA) [9], indentation test technique [10] and later computer simulation method have been introduced to the studies on interface problems. Among these instruments and equipment, some can directly observe the microstructure changes of the interfacial transition zone.…”