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Title: Property investigation of calcium–silicate–hydrate (C–S–H) gel in cementitious composites

Calcium–silicate–hydrate (C–S–H) gel, the main product of cement hydration, contributes the most to engineering properties of concrete. Hence, the microstructural physical and mechanical properties of C–S–H gel present in cementitious composites were investigated by the coupled nanoindentation and scanning electron microscope analysis. The physical and mechanical properties were linked through the micro-poromechanical approach. Through this study, an insight was provided into the microstructural features of C–S–H gel present in cementitious composites. It is found that C–S–H gel is a multi-scale composite composed of C–S–H solid, pore and intermixtures at the scale of nanoindentation on C–S–H gel, and the physical and mechanical properties of C–S–H gel can be influenced by the porosity and volume fraction of the intermixtures. - Highlights: • A coupled nanoindentation and scanning electron microscope technique was applied. • The physical and mechanical properties were linked by the proposed model. • The porosity and poroelastic parameters were reported for the first time. • The influence of water to cement ratio was studied.
Authors:
 [1] ; ; ;  [2] ;  [1]
  1. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong (China)
  2. Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing (China)
Publication Date:
OSTI Identifier:
22403541
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 95; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM; CEMENTS; CONCRETES; GELS; HYDRATES; HYDRATION; MECHANICAL PROPERTIES; MICROSTRUCTURE; POROSITY; SCANNING ELECTRON MICROSCOPY; SILICATES; SOLIDS