82 resultados para Processing times
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The IPERB newsletter is published by the Public Employment Relations Board. The opinions expressed should not be considered official opinions of the Iowa PERB.
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Newsletter produced by Deaf Services Commission of Iowa
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The IPERB newsletter is published by the Public Employment Relations Board. The opinions expressed should not be considered official opinions of the Iowa PERB.
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The IPERB newsletter is published by the Public Employment Relations Board. The opinions expressed should not be considered official opinions of the Iowa PERB.
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The IPERB newsletter is published by the Public Employment Relations Board. The opinions expressed should not be considered official opinions of the Iowa PERB.
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The IPERB newsletter is published by the Public Employment Relations Board. The opinions expressed should not be considered official opinions of the Iowa PERB.
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The IPERB newsletter is published by the Public Employment Relations Board. The opinions expressed should not be considered official opinions of the Iowa PERB.
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The IPERB newsletter is published by the Public Employment Relations Board. The opinions expressed should not be considered official opinions of the Iowa PERB.
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The IPERB newsletter is published by the Public Employment Relations Board. The opinions expressed should not be considered official opinions of the Iowa PERB.
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Newsletter produced by Deaf Services Commission of Iowa
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Maps of Iowa's Biodiesel and Ethanol Processing Plants.
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The Office of Special Investigations at Iowa Department of Transportation (DOT) collects FWD data on regular basis to evaluate pavement structural conditions. The primary objective of this study was to develop a fully-automated software system for rapid processing of the FWD data along with a user manual. The software system automatically reads the FWD raw data collected by the JILS-20 type FWD machine that Iowa DOT owns, processes and analyzes the collected data with the rapid prediction algorithms developed during the phase I study. This system smoothly integrates the FWD data analysis algorithms and the computer program being used to collect the pavement deflection data. This system can be used to assess pavement condition, estimate remaining pavement life, and eventually help assess pavement rehabilitation strategies by the Iowa DOT pavement management team. This report describes the developed software in detail and can also be used as a user-manual for conducting simulation studies and detailed analyses. *********************** Large File ***********************
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Newsletter produced by Deaf Services Commission of Iowa
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The objectives of this research were the collection and evaluation of the data pertaining to the importance of concrete mixing time on air content and distribution, consolidation and workability for pavement construction. American Society for Testing and Materials (ASTM) standard C 94 was used to determine the significance of the mixing time on the consistency of the mix being delivered and placed on grade. Measurements of unit weight, slump, air content, retained coarse aggregate and compressive strength were used to compare the consistency of the mix in the hauling unit at the point of mixing and at the point placement. An analysis of variance was performed on the data collected from the field tests. Results were used to establish the relationship between selected mixing time and the portland cement concrete properties tested. The results were also used to define the effect of testing location (center and side of truck, and on the grade) on the concrete properties. Compressive strength test concepts were used to analyze the hardened concrete pavement strength. Cores were obtained at various locations on each project on or between vibrator locations to evaluate the variance in each sample, between locations, and mixing times. A low-vacuum scanning electron microscope (SEM) was used to study air void parameters in the concrete cores. Combining the data from these analysis thickness measurements and ride in Iowa will provide a foundation for the formulation of a performance based matrix. Analysis of the air voids in the hardened concrete provides a description of the dispersion of the cemtitious materials (specifically flyash) and air void characteristics in the pavement. Air void characteristics measured included size, shape and distribution.
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Newsletter produced by Deaf Services Commission of Iowa
