This report summarizes the findings of an experimental evaluation into alkali silica reaction (ASR) in cement free alkali-activated slag and fly ash binder concrete. The susceptibility of alkali-activated fly ash and slag concrete binders to deleterious ASR was evaluated in accordance with relevant ASTM standards.
Alkali-activated concrete (AAC) is an emerging technology in the construction materials sector. Being cement-free, AAC is a promising environmentally-friendly alternative to ordinary portland cement (OPC) concrete. Despite the improved performance and sustainability of AAC that has been established through various studies, some major technical challenges still remain in its realization as a viable construction material. One of them is the uncertainty with respect to the alkali-silica reactivity (ASR) durability performance of AAC.
The objective of this research was to develop a systematic methodology to understand overall demand, destination type choice, and route choice decisions in the aftermath of a hurricane. It will consider transportation, social and other relevant factors such as actions of agencies dealing with emergency operations. Data collected from past hurricanes will be used to estimate and calibrate the evacuation demand and behavior models. This research is focused on the New York/New Jersey metropolitan area, and will utilize available data sources in this area to conduct the proposed work.
This research aims to evaluate the different parking conditions that drivers face in critical areas of New York City, to examine the variables that impact their curbside behavior, and to develop recommendations to improve curb management.
The goal of this project is to develop a portable system for determining the mineralogical composition of aggregates in the field for quality control. Laser Induced Breakdown Spectroscopy (LIBS), which involves firing a laser pulse at a sample to determine its composition from light spectra emitted and interpreted using a spectrometer and a custom program, was chosen to be the basis of the portable system.
In this study, a fully immersive Virtual Reality (VR) based driving simulator was developed to serve as a “proof-of-concept” that VR can be utilized to assess the level of fatigue (or drowsiness) truck drivers typically experience during real-life driving conditions. This study also involved examining the impact of varying driving conditions (i.e., weather conditions and driving time (day or night)) on drivers’ fatigue measure.
Purpose: Develop a fully-immersive truck driving simulator using Virtual Reality to assess the truck driver’s level of fatigue typically experience during real-life varying driving conditions.
Background: Driver fatigue is a significant contributing factor to numerous fatal traffic crashes resulting in death or injury every year. Fatigue is invisible and there is no single symptom that can be exclusively identified to assess it in advance.
Skew of the supports in steel I-girder bridges cause undesirable torsional effects, increase cross-frame forces, and generally increase the difficulty of designing and constructing a bridge. The girders experience differential deflections due to the skewed supports, and undesirable effects arise when the girders are linked transversely. Before the placement of the deck, the main method of linking the girders transversely is through the use of cross-frames.
Between 1981and 2011, the State of Florida and private corporations, sometimes jointly, sometimes alone, made four different attempts to implement very high speed rail lines between Miami, Orlando, and Tampa, on which trains would run at very high speed, between 150 and 220 miles per hour. Yet, at present, the only new passenger line that is likely to begin operations between these cities is not very high speed, and will not run on dedicated track. Why did all the earlier attempts at very high speed lines fail, while a moderate speed line appears likely to succeed?
