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Showing 1 to 20 of 20 for “"calcium silicate hydrate (C-S-H)"”.
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Synthesis and nano-mechanical characterization of calcium silicate hydrate (C-S-H)
Calcium Silicate Hydrate (C-S-H) constitutes two-thirds of hydrated cement paste by volume. Having a better understanding of the mechanical properties of C-S-H will significantly aid in future effort for making concrete by design' for specific applications such as blast resistance. C-S-H is an …
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Silicon-29 and oxygen-17 nuclear magnetic resonance investigation of the structure of calcium-silicate-hydrate
This thesis investigates the structure of calcium-silicate-hydrate (C-S-H), a major hydration product of Portland cement, using primarily $\sp{29}$Si and $\sp{17}$O MAS and $\sp1$H-$\sp{29}$Si CPMAS NMR, XRD, chemical and thermal analysis. It presents a comprehensive defect-tobermorite structural …
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Nano-ChemoMechanical assessment of Rice Husk Ash cement by wavelength dispersive spectroscopy and nanoindentation
… with portlandite to form different types of calcium silicate hydrate (C-S-H). It is found that C-S-H in RHA cement has lower Ca/Si ratios compared to pure ordinary portland cement (OPC) samples prepared under the same conditions. Incorporation of RHA has minor effect on the mechanical …
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Investigation of Shrinkage Mechanisms in Hydrated and Carbonated Tricalcium Silicate Systems
… determinations, were obtained on fully hydrated tricalcium silicate (C(,3)S) paste that had original water/cement (w/c) ratios of 0.4 and 0.6. The surface area of the calcium silicate hydrate (C-S-H) phase determined by water is considered to be the single most important microstructural …
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Sulfate attack on cement paste with volcanic ash : durability analysis
… 30 days. The effect of gradual decomposition of calcium-silicate-hydrate (C-S-H) gel was examined using Raman spectroscopy and Magic Angle Nuclear Magnetic Resonance (MAS NMR), while the mechanical properties were determined using nanoindentation and compression tests. Exposure to magnesium …
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Synthesis and Multi-Scale Characterization of Calcium Silicate Hydrate at Multiple CaO/SiO2 Mixture Ratios
Calcium Silicate Hydrate (C-S-H) is the primary binding agent that is responsible for setting and hardening, strength, dimensional stability, and durability of Portland cement paste. Although Portland cement hydration produces C-S-H, Calcium hydroxide (CH), ettringite, and other hydration products …
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Phosphate-doped borosilicate enamel coating used to protect reinforcing steel from corrosion
<p>"Phosphate-doped sodium borosilicate glasses were developed for enamel coatings to provide corrosion protection for reinforcing steel in concrete. Phosphates have low solubilities in borosilicate glasses, generally less than about 4 mol%, and are incorporated mainly as isolated …
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Effects of elevated temperature exposure on cement-based composite materials
… x-ray analysis (SEM-EDS). Thermal degradation of calcium silicate hydrate (C-S-H) is assessed based on AFM image analysis and a statistical analysis of static and dynamic nanoindentation. Furthermore, the application of combined nanoindentation/SEM-EDS successfully overcomes the difficulty of …
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Characterization of calcium-silicate-hydrate and calcium-alumino-silicate-hydrate
… objectives of this thesis were to synthesize calcium silicate hydrate (C-S-H) and calcium aluminosilicate hydrate (C-A-S-H) and characterize their structures with varying Ca/Si ratios and aluminum content. As a secondary objective, carbonation behavior in synthesized C-S-H was studied. C-S-H …
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Hierarchical modeling of structure and mechanics of cement hydrate
… of the smallest building block of concrete, Calcium- Silicate-Hydrate (C-S-H). Given the variable stoichiometry and morphology of C-S-H, no accurate models were ever developed that could link electronic information at one end to the C-S-H molecular properties at the other end. This thesis …
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Probing water properties and cationic exchange in calcium-silicate-hydrate : an atomistic modeling study
… in the nano-pores of the highly disordered calcium-silicate-hydrate (C-S-H) which is the major binding phase of cement. The microscopic structure and dynamics of water confined in C-S-H have important implications on describing the cohesion and mechanical behavior of cement from its setting …
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Molecular Crosslinking of Calcium-Silicate-Hydrate with Organosilanes: Toward Engineering of Cementitious Matrices with High Thermal Resistance
… phenomena in which the galleries of inorganic calcium-silicate-hydrate (C-S-H), the main product of cement hydration, are directly bridged with bis-organosilanes molecules. The crosslinking with organic molecules provides C-S-H with attributes imperative for the reduced thermal conductivity …
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Influence of calcium-(alumino)-silicate-hydrate nanostructure on viscoelastic behavior
… advancing technology and methods. Currently, calcium-silicate-hydrate (C-S-H) is thought to be the phase responsible for viscoelasticity in concrete. Advances in small-scale mechanical testing in the past decade have allowed numerous studies to be conducted on both elastic and viscoelastic …
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A multiscale computational framework for cement paste
… We begin with the layered molecular structure of calcium-silicate-hydrate (C-S-H), the fundamental building block that is the binding phase in cementitious materials. Through combined loading simulations of the planar geometry, we find that a water-filled interface between calcium-silica layers …
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Calcium-Silicate-Hydrate in cementitious systems : chemomechanical correlations, extreme temperature behavior, and kinetics and morphology of in-situ formation
… material. A fundamental component known as Calcium-Silicate-Hydrate which forms from the reaction between cement and water is the binding phase in concrete. Curiously, this is the least understood component of concrete because of its porous amorphous structure. Further, beyond mere …
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Investigation of microstructure of disordered colloidal systems by small-angle scattering
… under various conditions. They are the calcium-silicate-hydrate (C-S-H) gel, magnesium-silicate-hydrate (M-S-H) gel, and micellar solution formed by Pluronics triblock copolymers. C-S-H is the main binding phase of ordinary Portland cements. An elaborate analytical model for the form …
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Stabilisation of clay subgrade soils using ground granulated blastfurnace slag
… test soil comprises 80% River Aire soil and 20% calcium montmorillonite. The main objectives of this research were to investigate the effect of GGBS, with and without lime, on the engineering behaviour (plasticity characteristics, compaction, unconfined compressive strength (UCS) and swelling …
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Characterisation and properties of alkali activated pozzolanic materials.
… has investigated the alkali activation of low calcium fly ashes. These form very poor pozzolans and the alkali activation of the fly ash offers the opportunity for the large scale use of fly ash. Water glass was selected as a suitable activator for the fly ash. A comprehensive series of tests …
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Synthesis of zeolites from geological materials and industrial wastes for potential application in environmental problems
… zeolite researchers are seeking cheaper aluminosilicate bearing raw materials, such as clay minerals, to produce synthetic zeolites. This research concerns the synthesis of zeolites and zeotypes derived from low-cost materials like kaolinite (KAO), natural clinker (NC) and fly ash (FA). The …
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Investigation on the Mechanical, Microstructural, and Electrical Properties of Graphene Oxide-Cement Composite
… are mineralogical counterpart of disordered Calcium-Silicate-Hydrate (C-S-H), increases from 3 d to 28 d, representing the crystallite growth due to continued hydration. However, the crystallite size of GOCC-0.05% was smaller than that of GOCC-0.01% at both 3 d and 28 d, indicating finer …