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Displaying 2776 - 2800 of 3873

Architecture for Discrete Construction Component Tracking

September 22, 1999
Author(s)
K M. Furlani, William C. Stone
Accurate and timely identification and tracking of construction components are critical to operating a well-managed and cost efficient construction project. Establishing standards to support identification and tracking technologies has the potential to

Finned-Tube Evaporator Model With a Visual Interface

September 19, 1999
Author(s)
Piotr A. Domanski
This paper presents a finned-tube evaporator model and its utility when equipped with a window-based interface. The modeling scheme is tube-by-tube and allows for specification of complex refrigerant circuits, modeling refrigerant distribution between

Cumulative Seismic Damage of Circular Bridge Columns: Variable Amplitude Tests

September 1, 1999
Author(s)
A El-Bahy, S K. Kunnath, William C. Stone, A W. Taylor
The findings from an experimental study to investigate cumulative seismic damage in reinforced concrete circular bridge piers is presented. Twelve identical quarter-scale bridge columns, designed in accordance with current AASHTO specifications, were

Global Model for Predicting the Burning Rates of Liquid Pool Fires (NISTIR 6381)

September 1, 1999
Author(s)
Anthony P. Hamins, Jiann C. Yang, Takashi Kashiwagi
A global model is presented which predicts the mass burning flux for pool fires consuming liquid fuels in a quiescent environment. the model assumes constant bulk properties such as flame temperature, soot volume fraction, and species concentration. The

Non-Intrusive Scanning Technology for Construction Assessment

September 1, 1999
Author(s)
Geraldine S. Cheok, William C. Stone
Work at the National Institute of Standards and Technology on laser radar imaging of a construction site is described. The objective of the research is to make measurements required in a construction project quicker and cheaper than current practice and to

Transport Properties and Durability of Concrete: Literature Review and Research Plan

September 1, 1999
Author(s)
Dale P. Bentz, J R. Clifton, Chiara F. Ferraris, Edward J. Garboczi, J M. Torrents
The increased emphasis on life cycle cost analysis for building projects requires that new attention be focused on the service life and durability of concrete structures. While concrete is typically specified based on compressive strength and slump, it is

Chemistry and Structure of Hydration Products

August 1, 1999
Author(s)
Paul E. Stutzman
This chapter covers papers published and abstracted in 1996 relating to cement hydration and the chemistry and structure of hydration products.

Effects of Cement PSD on Porosity Percolation and Self-Desiccation

August 1, 1999
Author(s)
Dale P. Bentz
The degree of self-desiccation in field concrete depends on the availability of external water to replace that consumed due to the chemical shrinkage that occurs during cement hydration. As the cement hydrates, the capillary porosity depercolates

Optimization of Polymer Concrete Composites: Final Report

August 1, 1999
Author(s)
L Czarnecki, A Garbacz, P Lukowski, J R. Clifton
The main aim of the study was the development of a method for the design and optimization of polymer concrete composites, using a fundamental approach based on a material model of polymer concrete. The polymer concrete materials were characterized via

SEM/X-Ray Imaging of Cement-Based Materials

August 1, 1999
Author(s)
Dale P. Bentz, Paul E. Stutzman, C Haecker, S Remond
Scanning electron microscopy and X-ray imaging techniques have been developed for imaging the complex microstructure of cement-based materials such as cement powder and fly ash. By combining the information available in the backscattered electron and

Mixed Layer Pyrolysis Model for Polypropylene

July 5, 1999
Author(s)
Kathryn M. Butler
A one-dimensional model describing the melting, degradation, and bubbling behavior of polypropylene exposed to a high heat flux is presented. The region of vigorous bubbling observed in experiment is represented as a mixed layer of uniform temperature

Modeling of Sprinkler, Vent and Draft Curtain Interaction

July 5, 1999
Author(s)
Kevin B. McGrattan, Anthony P. Hamins, Glenn P. Forney
The International Fire Sprinkler, Smoke & Heat Vent, Draft Curtain Fire Test Project organized by the National Fire Protection Research Foundation (NFPRF) brought together a group of industrial sponsors to support and plan a series of large scale tests to

Particulate Entry Lag in Spot-Type Smoke Detectors

July 5, 1999
Author(s)
Thomas G. Cleary, Artur A. Chernovsky, William L. Grosshandler, Michael D. Anderson
It is well documented that alarm signals from spot-type smoke detectors (ionization and photoelectric) are delayed when the threshold value has been achieved outside the detector housing as a result of convective transport of smoke through the detector to

Digital Images and Computer Modelling

July 1, 1999
Author(s)
Edward J. Garboczi, Dale P. Bentz, Nicos Martys
This chapter describes how digital images of porous materials can be analyzed to give information about the structure and properties of the material, describes various ways 3-D digital-image-based models can be generated to help understand real materials.

Dispersed Liquid Agent Fire Suppression Screen Apparatus

July 1, 1999
Author(s)
Jiann C. Yang, Michelle K. Donnelly, William L. Grosshandler, N C. Prive
The design, construction, demonstraion and operation of a bench-scale device capable of screening the fire suppression efficiency of liquid agents are described in detail in this report. The apparatus is based on a well-characterized flame, a means to
Displaying 2776 - 2800 of 3873
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