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Coherent diffraction study of calcite crystallization during the hydration of tricalcium silicate

DOI: 10.1016/j.matdes.2018.07.031 DOI Help

Authors: Xianping Liu (Tongji University; State Scholarship Fund of China) , Wei Lin (Tongji University) , Bo Chen (Tongji University; Research Complex at Harwell) , Fucai Zhang (Research Complex at Harwell; University College London; Southern University of Science and Technology) , Piqi Zhao (University of Jinan) , Aaron Parsons (Diamond Light Source) , Christoph Rau (Diamond Light Source) , Ian Robinson (Brookhaven National Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Materials & Design

State: Published (Approved)
Published: July 2018
Diamond Proposal Number(s): 9642

Abstract: The aim of this work is using Bragg coherent X-ray diffraction imaging (BCDI) to study the calcite crystallization during carbonation of hydrated tricalcium silicate (C3S). Portland cement is a very complex synthesized product whose 50–70% mass is composed of C3S, which is the most important phase to produce calcium silicate hydrates and calcium hydroxide. Hence, its hydration contributes greatly to the hydration of cement and later to the carbonation of cement products when it reacts with CO2, often from the air, to form calcium carbonates. BCDI has emerged in the last decade as a promising high-resolution lens-less imaging approach for characterization of various samples. It has made significant progress with the development of X-ray sources and phase-retrieval algorithms. BCDI allows for imaging the whole three-dimensional structure of micro- and sub-micro- crystalline materials and can show the strain distribution at the nanometer spatial resolution. Results show that calcite crystallization follows a through-solution reaction and the growth model of the calcite crystal can be explained by using “phase domain” theory. During carbonation, calcite crystals grow by increasing the number of phase domains within them while the domain size remains at about 200–300 nm.

Journal Keywords: Carbonation; Bragg coherent X-ray diffraction imaging (BCDI); Calcite crystallization; Tricalcium silicate (C3S)

Subject Areas: Materials, Engineering

Instruments: I13-1-Coherence

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