Identification of transversely isotropy of calcium silicate hydrate using nanoindentation and finite element analysis. (20th November 2020)

• Record Type: Journal Article
• Authors: Vimonsatit, Vanissorn; Lee, Hyuk; Huen, Wai Yeong; Mendis, Priyan; Baduge, Shanaka Kristombu; Thilakarathna, Sadeep
• Is Part Of: Construction & building materials. Volume 261(2020)
• Publication Date: 2020-11-20
• Subjects: Nanoindentation -- CSH -- Cement -- Mechanical properties -- Porosity; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2020.119900
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Establishing dimensional functions for developing a transversely isotropic material model. The present full back analysis incorporates Artificial Neural Networks to achieve a robust procedure for determining transversely isotropic material properties. The solid stiffness exhibits an isotopic behaviour and the strength properties of the solid-to-solid contact of CSH show the non-negligible friction and cohesion in different directions. The solid elementary in CSH possesses an isotropic elasticity behaviour and anisotropic strength behaviour. Abstract: Understanding the mechanical behaviour of Calcium Silicate Hydrate (CSH) is a key to fundamental and engineering advances in improving the performance of cementitious materials. It is well known that CSH exists in two forms that low-density CSH (LD CSH) and high-density CSH (HD CSH). Herein, this paper focuses on transversely isotropic properties of two form of CSH using nanoindentation technique, finite element (FE) analysis, dimensional analysis and artificial neural networks (ANNs) with microporomechanics to investigate its elastic properties, packing density and cohesive strength properties. The finding of this paper demonstrates that nanoindentation technique could reveal the transversely isotropic properties of materials and its elementary solid in elasticity and strength behaviour. The obtained results show that the solid elementary present in CSH possesses an isotropic elasticity behaviour and anisotropic strength behaviour.