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Displaying 5976 - 6000 of 13218

Mitigating Autogeneous Shrinkage by Internal Curing

October 1, 2002
Author(s)
M R. Geiker, O M. Jensen
… highly effective means of mitigating autogenous shrinkage in cement mortars (w/s = 0.35, 8 % silica fume). Two … rates, the SAP system is seen to be more efficient in reducing autogenous shrinkage at later ages, most likely … microstructure. A comparison of the water distribution in the different systems, based on computer modeling and …

Effects of Crosslink Density on Surface and Interface Properties of Amine-Cured Epoxy

February 1, 2002
Author(s)
Xiaohong Gu, Tinh Nguyen, Mark R. VanLandingham, D T. Raghavan
… substrate are used for the analysis. All samples are cured in CO 2 -free air. The crosslink density is measured by … dynamic mechanical analysis (DMA). Both the film surface in contact with air and that in contact with the silicon substrate (the interface) of …

The Impact-Echo Method: An Overview

May 1, 2001
Author(s)
Nicholas J. Carino
… The impact-echo method is a technique for flaw detection in concrete. It is based on monitoring the surface motion … many of the barriers associated with flaw detection in concrete based on ultrasonic methods. The purpose of this … technique and to discuss the important parameters involved in this type of testing. One of the key features of the …

Characterization of Polyester Degradation Using Tapping Mode Atomic Force Microscopy; 1. Exposure in Alkaline at Room Temperature

January 1, 2001
Author(s)
Xiaohong Gu, D T. Raghavan, Tinh Nguyen, Mark R. VanLandingham, D Yebassa
… of polyester materials is their sensitivity to hydrolysis. In this paper, tapping mode atomic force microscopy (AFM) has … the degradation mode and mechanism of polyester coatings in alkaline media. … AFM, alkaline, building technology, degradation, FTIR, hydrolysis, LC/MS, phase …

Estimation of Absorbed Photolytic Dosage and Quantum Yields Using UV-Vis and FTIR spectroscopies

March 1, 2000
Author(s)
Jonathan W. Martin, Tinh Nguyen, E Byrd, N Embree
… through the apparent quantum yield, has a firm basis in the priciples of photochemistry. The primary inputs into this model are radiation dosage absorbed in the material and material damage, and the outputsare … environments to which a coating is expected to be exposed in the field and to allow the effects of competing …

SEM/X-Ray Imaging of Cement-Based Materials

August 1, 1999
Author(s)
Dale P. Bentz, Paul E. Stutzman, C Haecker, S Remond
… powder and fly ash. By combining the information available in the backscattered electron and relevant X-ray images, an … the image acquisition and processing techniques used in performing this analysis, as well as the statistics that … fractions, surface fractions, and correlation functions. In addition, two applications are presented: 1) the imaging …

A Liquefaction Evaluation Procedure Based on Shear Wave Velocity

May 14, 1999
Author(s)
R D. Andrus, K H. Stokoe
… data from 26 earthquakes and over 70 measurement sites in soils ranging from sand to sandy gravel with cobbles to … U.S.-Japan Cooperative Program in Natural Resources; Panel on Wind and Seismic Effects (UJNR) … building technology, earthquakes, in situ measurements, seismic …

Relating Thermoplastic Olefin (TPO) Microstructure to Paint Adhesion

May 1, 1999
Author(s)
Mark R. VanLandingham
… Advances in the use of the atomic force microscope (AFM) to … contrast enhancement of topographic features and, in some cases, revealing heterogeneity in the polymer microstructure that is not apparent in the … atomic force microscopy, building technology, nanoindentation, phase imaging, polymer blend, …

Draft Guidelines for Evaluating Liquefaction Resistance Using Shear Wave Velocity Measurements and Simplified Procedures

March 1, 1999
Author(s)
R D. Andrus, K H. Stokoe, R M. Chung, C H. Juang
… the liquefaction resistance of soil is an important step in the engineering design of new and the retrofit of existing structures in earthquake-prone regions. The procedure currently used in the U.S. and throughout much of the world to predict … building technology, earthquakes, in-situ measurements, seismic …

Process Engineering Data STEP Application Protocol, Version 1.0

June 1, 1998
Author(s)
S W. Kline, Mark E. Palmer, J Fielding, M Gilbert, T Teague, D Witherall
… (ISO) standard. The clauses and annexes contained in this document are those required by ISO for Committee … application protocol, building technology, equipment, process design, process engineering …

Automation Infrastructure System for a Robotic 30-Ton Bridge Crane

April 1, 1998
Author(s)
William C. Stone, L E. Pfeffer
… and industrial plants, e.g. girders, tanks, and pipes. In order to achieve six degree-of-freedom manipulation of the … needed to supply that information to remote sites in real-time. … bridge cranes, building technology, construction automation, construction simulators, …

Assessment of Wind Load Factors for Hurricane-Prone Regions.

January 1, 1998
Author(s)
Emil Simiu, T M. Whalen
… study the issue of whether the wind load factors specified in the ASCE 7-95 Standard for hurricane-prone regions on the … for wind loads inducing the design strength results in (1) safety levels that are considerably lower for … wind engineering, wind velocity, weather effects, building technology, codes, standards, structural reliability …

Intracycle Evaporative Cooling in a Vapor Compression Cycle (NISTIR 5873)

September 1, 1996
Author(s)
B. S. Kim, Piotr A. Domanski
… by a semi-theoretical simulation model and experimentally in an instrumented laboratory heat pump at the cooling mode … profiles of refrigerant and heat-transfer fluid in the heat exchangers are reported. The laboratory measured … cooling, air conditioning, building technology, coefficient of performance, heat pumps, …

Application of Digital-Image-Based Models to Microstructure, Transport Properties, and Degradation of Cement-Based Materials.

January 1, 1996
Author(s)
Dale P. Bentz, Edward J. Garboczi, Nicos Martys
… or percolation of each phase or any combination of phases. In addition, physical properties such as diffusivity and … of the importance of volume fraction and phase topology in determining physical properties will be presented for each … observed. These techniques are seen as one critical link in developing sound scientific relationships between the …
Displaying 5976 - 6000 of 13218
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