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Displaying 2701 - 2725 of 3902

Performance Data on Cold Temperature Dispersion of CF3I

May 2, 2000
Author(s)
Jiann C. Yang, Thomas G. Cleary, Michelle K. Donnelly
Tritluoroiodomethane (CF3I) has been proposed as a potential replacement for Halon 1301 in aircraft engine nacelle and dry bay fire protection applications. The potential use of CF3I in fuel tank ullage inerting has also been considered recently. Before

Performance of a Fast Response Agent Concentration Meter

May 2, 2000
Author(s)
Erik L. Johnsson, George W. Mulholland, Gerald T. Fraser, A Zuban, I I. Leonov
There is a need for monitoring the concentration of potential halon replacement chemicals with millisecond response time [I]. One scenario of great concern to the Air Force is the penetration of an enemy shell into the fuel tank of an aircraft. To prevent

SCREENING OF CANDIDATE FIRE SUPPRESSANTS

May 2, 2000
Author(s)
Marc R. Nyden, Jiann C. Yang, J D. Mather
Exploratory research has indicated that the following chemical families are likely 10 contain chemicals possessing both a high degree of fire suppression efficiency and low environmental impact: the bromoalkenes, bromoethers, and phosphorus-containing

Critical Gaps in Durability Data for FRP Composites in Civil Infrastructure

May 1, 2000
Author(s)
V M. Karbhari, Joannie W. Chin, D R. Reynaud
Although fiber reinforced polymer (FRP) composites are increasingly being used for the renewal of civil infrastructure, there are still some major questions related to the durability of these materials in a civil engineering environment. This concern is

Fibers, Percolation, and Spalling of High-Performance Concrete

May 1, 2000
Author(s)
Dale P. Bentz
While the strength and durability of high performance concretes (HPCs) are often greatly superior to conventional concretes under ambient conditions, their failure is sometimes rapid and dramatic during exposure to a fire, characterized by the explosive

Fire Performance of High Strength Concrete: Research Needs

May 1, 2000
Author(s)
Long T. Phan, Nicholas J. Carino
A compilation of fire test data which shows distinct behaviroal differences between HSC and NSC at elevated temperature is presented. The differences are most pronounced in the temperature range of 20 {degrees}C to 400 {degrees}C. What is more important is

Modeling the Microstructure and Elastic Properties of Complex Materials

May 1, 2000
Author(s)
A P. Roberts, Edward Garboczi
This document is derived from three reviewed papers by the same authors: (1)Elastic properties of a tungsten-silver composite by reconstruction and computation; (2)Elastic properties of model porous ceramics; and (3)Elastic properties of model random three

Shear Strength of High-Strength Concrete Walls and Deep Beams

May 1, 2000
Author(s)
Dat Duthinh
In the last 30 years, the compressive strength of concrete that can be produced reliably in the field has more than doubled, from 35 MPa (5000 psi) to 85 MPa (12 000 psi). Strengths as high as 140 MPa (20 000 psi) can be achieved in the laboratory and, on

Spot Test Kits for Detecting Lead in Household Paint: A Laboratory Evaluation

May 1, 2000
Author(s)
Walter J. Rossiter Jr, M Vangel, M E. McKnight, G Dewalt
A laboratory study was conducted to determine the reliability of spot test kits for detecting the presence of lead in household paint when tests were conducted by certified lead inspectors or risk assessors. Reagent solutions were applied to paint

Full-Scale House Fire Experiment for InterFIRE VR, May 6, 1998. Report of Test.

April 10, 2000
Author(s)
Anthony D. Putorti Jr., Jay A. McElroy
A public/private partnership involving multiple federal agencies and private industry was assembled to develop a comprehensive fire investigation training tool. The partnership consisted of the following federal agencies: the Bureau of Alcohol, Tobacco and

Compositional Analysis of NIST Reference Material Clinker 8486

April 1, 2000
Author(s)
Paul E. Stutzman, Germain Lespinasse, Stefan D. Leigh
Certification of the phase compositions of the NIST Reference Clinkers often is based upon more than one independent method. The current certificate values were established using an optical microscope examination, and additional microscope data taken from

Retrofit of Pre-Northridge Moment-Resisting Connections

April 1, 2000
Author(s)
S A. Civjan, M D. Engelhardt, John L. Gross
An experimental program was undertaken to evaluate methods to retrofit existing steel moment connections for improved seismic performance. Six full-scale subassemblages were tested under cyclic loading. Typical pre-Northridge connections were retrofit by
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