The study of disorder and nanocrystallinity in C-S-H, supplementary cementitious materials and geopolymers using pair distribution function analysis

Date

2011-07-01

Author

Akgül, Çağla
Monteiro, Paulo JM

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

169
views

0
downloads

Significant progress was achieved with the application of Rietveld method to characterize the crystalline phases in portland cement paste. However, to obtain detailed information on the amorphous or poorly crystalline phases, it is necessary to analyze the total scattering data. The pair distribution function (PDF) method has been successfully used in the study of liquids and amorphous solids. The method takes the Sine Fourier transform of the measured structure factor over a wide momentum transfer range, providing a direct measure of the probability of finding an atom surrounding a central atom at a radial distance away. The obtained experimental characteristic distances can be also used to validate the predictions by the theoretical models, such as, molecular dynamics, ab initio simulations and density functional theory. The paper summarizes recent results of PDF analysis on silica fume, rice husk ash, fly ash. ASR gel, C-S-H and geopolymers.

Subject Keywords

Amorphous material, Calcium-Silicate-Hydrate (C-S-H), X-ray diffraction, Alkali-aggregate reaction, Geopolymer

URI

https://hdl.handle.net/11511/38780

Journal

CEMENT AND CONCRETE RESEARCH

DOI

https://doi.org/10.1016/j.cemconres.2011.03.027

Collections

Department of Civil Engineering, Article

Suggestions

OpenMETU
Core

The Investigation of the Addition of Sodium Lignosulfonate to Lime Column Used For Improving the Expansive Soils Ozkan, Ilyas; Çokça, Erdal (2023-1-01) The lime column (LC) technique has been commonly used for the improvement of expansive soils. The achievement of this technique depends on the lime diffusion into the expansive soils, but lime diffusion into the expansive soil is generally a slow process due to the low permeability of these soils. In this study, sodium lignosulfonate, which is used as a superplasticizer in the concrete industry, was added to lime columns to accelerate the diffusion of lime particles. First, treated expansive clay specimens ...
A laboratory study of anisotropy in engineering properties of Ankara clay İspir, Mustafa Erdem; Ergun, Mehmet Ufuk; Department of Civil Engineering (2011) Anisotropy in engineering properties of soils occurs due to the depositional process forming the soil fabric and/or different directional stresses in soil history. This study investigates the anisotropy in undrained shear strength and drained compressibility of preconsolidated, stiff and fissured Ankara Clay. The compressibility behavior is determined using standard oedometer testing while the shear strength anisotropy is investigated through large diameter unconsolidated-undrained triaxial testing on undis...
A Study on Characterization of Light-Induced Electroless Plated Ni Seed Layer and Silicide Formation for Solar Cell Application Takaloo, Ashkan Vakilipour; Joo, Seung Ki; ES, FIRAT; Turan, Raşit; LEE, Doo Won (2018-03-01) Light-induced electroless plating (LIEP) is an easy and inexpensive method that has been widely used for seed layer deposition of Nickel/Copper (Ni/Cu)-based metallization in the solar cell. In this study, material characterization aspects of the Ni seed layer and Ni silicide formation at different bath conditions and annealing temperatures on the n-side of a silicon diode structure have been examined to achieve the optimum cell contacts. The effects of morphology and chemical composition of Ni film on its ...
Effects of chain extension and branching on the properties of recycled poly(ethylene terephtkalate)-organoclay nanocomposites Keyfoğlu, Ali Emrah; Yılmazer, Ülkü; Department of Chemical Engineering (2004) In this study, the effects of chain extension and branching on the properties of nanocomposites produced from recycled poly(ethylene terephthalate) and organically modified clay were investigated. As the chain extension/branching agent, maleic anhydride (MA) and pyromellitic dianhydride (PMDA) were used. The nanocomposites were prepared by twin-screw extrusion, followed by injection molding. Recycled poly(ethylene terephthalate), was mixed with 2, 3 and 4 weight % of organically modified montmorillonite. Du...
The modified Vlasov model on a nonhomogeneous and nonlinear soil layer Isbuga, Volkan; Cerezci, Mehmet; Aşık, Mehmet Zülfü (2022-09-01) © 2022 Elsevier LtdThis study presents a novel approach to account for the soil nonlinearity of nonhomogeneous soil deposits in foundation deflection analyses in the context of a modified Vlasov foundation model. We present an extension of the previously proposed formulation by developing a new formulation employing an improved algorithm that takes the modulus degradation curves at varying strain levels into account in an iterative manner. This new model, which takes the nonlinear soil behavior into account...

Citation Formats

Ç. Akgül and P. J. Monteiro, “The study of disorder and nanocrystallinity in C-S-H, supplementary cementitious materials and geopolymers using pair distribution function analysis,” CEMENT AND CONCRETE RESEARCH, pp. 696–710, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38780.