Searched for: subject%3A%22Silica%22
(1 - 20 of 60)

Pages

document
Roza, Rintati (author)
This thesis aims to find out whether electrokinetic transport of a calcium chloride solution can be controlled by adding sodium ions by performing molecular dynamics simulations. The idea that electrokinetic transport control is a possibility originates from research that found that charge inversion is reduced when monovalent ions are added to a...
master thesis 2021
document
Oesch, Tyler (author), Weise, Frank (author), Marx, Heidi (author), Kositz, Mario (author), Huenger, Klaus-Juergen (author)
Intensified Alkali-Silica Reaction (ASR) damage has occurred on German roadways in recent years, leading to requirements for compulsory pre-construction investigation of aggregate alkali sensitivity using concrete tests with external alkali supply. However, since these tests are time-consuming and cost-intensive, there is interest in replacing...
conference paper 2021
document
Takahashi, Yuya (author), Gong, Fuyuan (author), Maekawa, Koichi (author)
Using numerical simulations, this study investigated the concrete expansion damage caused by the coupled action of freeze-thaw cycles (FTC) and alkali silica reactions (ASR). In the authors’ previous experiments, it was shown that a preceding ASR definitely accelerated the succeeding expansion by FTC. Further, even if the specimens have...
conference paper 2021
document
Wang, Wei (author), Zhang, Shizhe (author), Guang, Ye (author), Noguchi, Takafumi (author)
Alkali activated materials (AAMs) have received worldwide attention due to its lower embodied energy and environmental impact than that of traditional cementitious materials. However, the activators with high alkalinity may raise the risk of alkali silica reaction (ASR) induced deterioration when reactive aggregates are used, which thereby...
conference paper 2021
document
Ni, Chenxin (author), Yu, Zhuqing (author), Shen, Xiaodong (author)
As one of the mineral admixtures, silica fume (SF) with high pozzolanic reactivity is generally used to improve the properties of concrete. Most commercial silica fume used in concrete project is dry densified silica fume (DSF). It consists of a good deal of agglomerates of sizes ranging from 10 μm to several millimeters. The size of the...
conference paper 2021
document
Liu, Qing-feng (author), Mao, Li-xuan (author), Hu, Zhi (author)
Existing reinforced concrete structures experience severe durability degradation when subjected to alkali–silica reaction (ASR) and chloride attack. A special electrochemical rehabilitation treatment, containing lithium compound anolyte, has been developed to drive lithium ions into concrete as well as remove chlorides simultaneously, for...
conference paper 2021
document
Shi, Zhenguo (author), Lothenbach, Barbara (author)
Using Al-rich supplementary cementitious materials to partially replace Portland cement is a well-established empirical approach to mitigate expansion of concrete caused by alkali-silica reaction (ASR). However, the mechanisms behind it are still not completely understood. Synthesis of ASR products in the laboratory provides a unique opportunity...
conference paper 2021
document
Kongshaug, Simen Sørgaard (author), Larssen, Rolf Magne (author), Hendriks, M.A.N. (author), Kanstad, Terje (author), Markeset, Gro (author)
Material modelling, from the micro to the macro level, of concrete affected by alkali–silica reaction (ASR) has been devoted a lot of research. However, the application of the material models in structural analyses of reinforced concrete (RC) structures, showing the structural implications/consequences of ASR, has got little attention in the...
journal article 2021
document
Sharma, Anuvansh (author), Foppen, Jan Willem (author), Banerjee, Abhishek (author), Sawssen, Slimani (author), Bachhar, Nirmalya (author), Peddis, Davide (author), Bandyopadhyay, S. (author)
Abstract: To monitor and manage hydrological systems such as brooks, streams, rivers, the use of tracers is a well-established process. Limited number of potential tracers such as salts, isotopes and dyes, make study of hydrological processes a challenge. Traditional tracers find limited use due to lack of multiplexed, multipoint tracing and...
journal article 2021
document
Doekhi-Bennani, Y. (author), Mir Leilabady, N. (author), Fu, Mingyan (author), Rietveld, L.C. (author), van der Hoek, J.P. (author), Heijman, Sebastiaan (author)
Continuous development of industry and civilization has led to changes in composition, texture and toxicity of waste water due to the wide range of pollutants being present. Considering that the conventional wastewater treatment methods are insufficient for removing micropollutants and nutrients to a high level, other, alternative, treatment...
journal article 2021
document
Zheng, X. (author), Jiang, N. (author), Zheng, Huaili (author), Wu, Yuyang (author), Heijman, Sebastiaan (author)
One framework type of high-silica zeolite only can effectively remove a limited range of organic micropollutants (OMPs) from water. In order to extend the OMP removal range, different types of high-silica zeolites need to be combined in the adsorption process. In this study, Mordernite (MOR) and ZSM-5 (MFI) high-silica zeolite powders were mixed...
journal article 2021
document
Qiu, Xiujiao (author), Chen, J. (author), Deprez, Maxim (author), Cnudde, Veerle (author), Ye, G. (author), De Schutter, Geert (author)
The microstructure of alkali-reactive aggregates, especially the spatial distribution of the pore and reactive silica phase, plays a significant role in the process of the alkali silica reaction (ASR) in concrete, as it determines not only the reaction front of ASR but also the localization of the produced expansive product from where the...
journal article 2021
document
Wang, Wei (author), Zhang, S. (author), Ye, G. (author), Noguchi, Takafumi (author)
Alkali activated materials (AAMs) have received worldwide attention due to its lower embodied energy and environmental impact than that of traditional cementitious materials. However, the activators with high alkalinity may raise the risk of alkali silica reaction (ASR) induced deterioration when reactive aggregates are used, which thereby...
conference paper 2021
document
Westerbaan van der Meij, Fenna (author)
In the pursuit of gaining a better understanding of the mechanisms of oxide-electrolyte interfaces, this thesis presents a working model that mimics a dynamic surface charge distribution by introducing protonation and deprotonation events using MD simulation. Due to the limitations of measurement equipment that operate on an atomic scale,...
master thesis 2020
document
Flambouris, Stelios (author)
Reverse osmosis (RO) is considered the most reliable and cost-effective membrane desalination technologyworldwide. However, it suffers significant performance limitations due to mainly inorganic foulinggenerated in the highly concentrated brine. Especially, scaling caused by silica and silicates depositionsresults in irreversible damages with...
master thesis 2020
document
Liu, Z. (author), Bode, Vincent (author), Hadayati, Pegah (author), Onay, Hayati (author), Sudhölter, Ernst J. R. (author)
We have investigated the conditions of colloidal stability of silica nanoparticles smaller than 100 nm for their applications in enhanced oil recovery (EOR), especially pertaining to chemical flooding processes. Using zeta sizer and dynamic light scattering techniques, the stability of silica nanoparticle (SNP) dispersions has been...
journal article 2020
document
Kongshaug, Simen Sørgaard (author), Oseland, Oddbjørn (author), Kanstad, Terje (author), Hendriks, M.A.N. (author), Rodum, Eva (author), Markeset, Gro (author)
The alkali silica reaction (ASR) in concrete causes internal localized swelling and micro cracking, which result in expansion and correlated deterioration of the concrete material. The stress state of the concrete is known to affect expansion due to ASR, with an anisotropic stress state giving rise to anisotropic expansion. Similarly, the...
journal article 2020
document
Schmitt, Julien (author), Zeeuw, Jan Joost (author), Zeeuw, Jan Joost (author), Plomp, J. (author), Bouwman, W.G. (author), Washington, Adam L. (author), Duif, C.P. (author), Thijs, M.A. (author), Parnell, S.R. (author)
The initial formation stages of surfactant-templated silica thin films which grow at the air-water interface were studied using combined spin-echo modulated small-angle neutron scattering (SEMSANS) and small-angle neutron scattering (SANS). The films are formed from either a cationic surfactant or nonionic surfactant (C16EO8) in a dilute...
journal article 2020
document
Poltorak, L. (author), van der Meijden, Nienke (author), Skrzypek, Sławomira (author), Sudhölter, Ernst J. R. (author), de Puit, M. (author)
In this work, we have simultaneously examined, electrochemically driven deposition of three proteins (haemoglobin, acid phosphatase, and α-amylase) and silica films at a polarized liquid–liquid interface. The interfacial adsorption of the proteins occurs efficiently within the acidic pH range (pH = 2–4). The interfacial charge transfer...
journal article 2020
document
Jiang, N. (author), Shang, R. (author), Heijman, Sebastiaan (author), Rietveld, L.C. (author)
High-silica zeolites can be used for adsorption of organic compounds (OCs) from water. The adsorption efficacy could vary with the properties of OCs, as well as the porous and surface features of high-silica zeolites. In this study, the adsorption of triclosan, trichlorophenol (TCP) and phenol by ten high-silica zeolites were investigated. The...
journal article 2020
Searched for: subject%3A%22Silica%22
(1 - 20 of 60)

Pages