Examination of gamma‐irradiated calcium silicate hydrates. Part I: Chemical‐structural properties

Abstract

The chemical‐structural properties of synthetic calcium silicate hydrate (C‐S‐H) with C/S (Ca/Si) ratios of 0.75, 1 and 1.33 were studied after gamma irradiation‐absorbed doses ranging from 0.145 to 0.784 MGy and compared with those of control specimens. The results showed that the total water content given by thermogravimetric analysis and the dimension of the basal spacing given by x‐ray diffraction were comparable for control and irradiated samples, which indicate that the interlayer water content did not change. The morphology, C/S ratios, and silicate mean chain length were also found to be unaltered by the absorbed gamma doses.

Simulation of radiation damage via alpha decay in BFS:PC grouts using 4He2+ ion acceleration

“…Examination of similar 20-year-old cement formulations showed the distribution of hydrotalcite in areas tentatively thought to represent the outer product in terms of texture [33], and significant microstructural refinement is expected to occur as time and hydration progress. This is important because the impact of radiation on the system could be altered, depending on the microstructure, which could affect the performance of the material differently (e.g., in terms of creep behaviour [41]).…”

Composite Powders Synthesized from the Water Solutions of Sodium Silicate and Different Calcium Salts (Nitrate, Chloride, and Acetate)

“…There are some articles devoted to the syntheses of hydrated calcium silicates or wollastonite using colloidal SiO 2 or Si(OC 2 H 5 ) 4 (TEOS) as precursors of SiO 3 2− ions. For example, the synthesis of hydrated calcium silicates with different CaO/SiO 2 mass ratios of 0.75, 1.0, and 1.33 was conducted using the mechanochemical conditions from silica (Aerosil 200) and freshly obtained CaO from CaCO 3, mixing them in deionized water using a roller mill for 2 days [35]. Mechanochemical synthesis was used for the synthesis of calcium silicate from CaCO 3 and silica at room temperature [36].…”