Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Quality Assurance for Rapid Airfield Construction
This investigation was conducted to formalize a quality assurance (QA) process for rapid airfield construction. The specific aspects of QA that were addressed included compaction operations and the assessment of strength for both soil and stabilized soil layers. The QA for compaction relies on the construction of a test section for determining optimum number of compaction coverages and target soil properties. The essential pieces of equipment for the compaction QA process include a microwave oven, a Clegg hammer, and tools necessary to conduct a volume-replacement density test for in-place soil. This density test, which was developed during this investigation, involves the use of steel shot as the volume replacement material. The use of steel shot, instead of a conventional sand cone apparatus, was found to make the test both simpler and quicker. The Clegg hammer results are the primary means ofjudging compaction; thus, the requirements for density tests are minimized through a stepwise acceptance procedure. Statistical criteria for evaluating Clegg hammer and density measurements are also included herein. For estimating soil strength in terms of California bearing ratio, the conventional use of the dual-mass dynamic cone penetrometer is recommended. For estimating the strength of cement- stabilized soil and cement plus fiber-stabilized soil, a correlation between Clegg hammer results and unconfined compressive strength was developed.
Quality Assurance for Rapid Airfield Construction
This investigation was conducted to formalize a quality assurance (QA) process for rapid airfield construction. The specific aspects of QA that were addressed included compaction operations and the assessment of strength for both soil and stabilized soil layers. The QA for compaction relies on the construction of a test section for determining optimum number of compaction coverages and target soil properties. The essential pieces of equipment for the compaction QA process include a microwave oven, a Clegg hammer, and tools necessary to conduct a volume-replacement density test for in-place soil. This density test, which was developed during this investigation, involves the use of steel shot as the volume replacement material. The use of steel shot, instead of a conventional sand cone apparatus, was found to make the test both simpler and quicker. The Clegg hammer results are the primary means ofjudging compaction; thus, the requirements for density tests are minimized through a stepwise acceptance procedure. Statistical criteria for evaluating Clegg hammer and density measurements are also included herein. For estimating soil strength in terms of California bearing ratio, the conventional use of the dual-mass dynamic cone penetrometer is recommended. For estimating the strength of cement- stabilized soil and cement plus fiber-stabilized soil, a correlation between Clegg hammer results and unconfined compressive strength was developed.
Quality Assurance for Rapid Airfield Construction
R. B. Freeman (Autor:in) / T. A. Mann (Autor:in) / L. W. Mason (Autor:in) / C. A. Gartrell (Autor:in) / V. M. Moore (Autor:in)
2008
123 pages
Report
Keine Angabe
Englisch
Air Transportation , Management Practice , Civil Engineering , Construction Equipment, Materials, & Supplies , Materials , Landing fields , Quality assurance , Compacting , Stabilization , Density , Measurement , Sand , Cements , Acceptability , Compressive strength , Construction , Soils , Soil mechanics , Test equipment , Optimization , Layers
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