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Surface Properties of Cement Paste Evaluated by Scanning Probe Microscopy

Open Journal of Civil Engineering 2016年第4期6卷 643-652页

作者： yuya sakai Institute of Industrial Science The University of Tokyo Tokyo Japan

The microscopic physical properties of Hardened Cement Paste (HCP) surfaces were evaluated by using Scanning Probe Microscopy (SPM). The cement pastes were cured under a hydrostatic pressure of 400 MPa and the contacting surfaces with a slide glass during the curing were studied. Scanning Electron Microscope (SEM) observation at a magnification of 7000 revealed smooth surfaces with no holes. The surface roughness calculated from the SPM measurement was 4 nm. The surface potential and the frictional force measured by SPM were uniform throughout the measured area 24 h after the curing. However, spots of low surface potential and stains of low frictional force and low viscoelasticity were observed one month after curing. This change was attributed to the carbonation of hydrates.

关键词： Cement Paste Scanning Probe Microscopy Surface Potential Frictional Resistance Viscoelasticity

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Non-Destructive Imaging of Water Permeation through Cementitious Materials Using MRI

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Open Journal of Civil Engineering 2017年第3期7卷 378-388页

作者： yuya sakai Yuki Yokoyama Toshiharu Kishi Institute of Industrial Science The University of Tokyo Tokyo Japan

In this study, water permeation through cementitious materials was observed using magnetic resonance imaging (MRI). The influence of cement type on the magnetic resonance signal was studied subsequent to determining the parameters required for imaging. Consequently, adequate imaging of water permeating through hardened cement paste (HCP) made with white Portland cement was achieved, while water permeation through ordinary Portland cement-based HCP yielded poor signal. HCPs maintained at various levels of relative humidity (RH) were observed, and the signal was detected only from those maintained at an RH of higher than 85%. The water permeation depths in HCP were observed by using MRI, and the measured depths were compared to those measured via a spraying water detector on the split surface of the specimens. As a result, good agreement was confirmed between the two methods. Additionally, MRI was applied to concrete specimens;although it was found that water was not detected when a lightweight aggregate was used, water permeation through concrete with limestone aggregate was detectable via MRI. MRI will help in understanding how water permeation causes and accelerates concrete deteriorations such as rebar corrosion and freezing and thawing.

关键词： MRI Cement Paste Concrete Water Permeation Non-Destructive Testing

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Enhancement of Magneto-Optic Effect in Optical Isolator with Semiconductor Guiding Layer by Selective Oxidation of AlInAs

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光学学报 2003年第S1期23卷 179-180页

作者： Takashi sakai yuya Shoji Hideki Yokoi Tetsuya Mizumoto Department of Electrical and Electronic Engineering Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 JapanDepartment of Electrical and Electronic Engineering Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 JapanDepartment of Electrical and Electronic Engineering Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 JapanDepartment of Electrical and Electronic Engineering Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 Japan

Selective oxidation of an AlInAs layer was investigated for enhancement of magneto-optic effect in an optical isolator. Twelve times nonreciprocal phase shift enhancement was estimated from a measured AlInAs-oxide ref... 详细信息

关键词： of by with in YIG Figure

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