Determination of Cement Content in Soil Cement Mixtures and Concrete.

摘要

The interim report summarizes the results from laboratory work conducted to establish the nesessary analytical parameters for determination of cement content in soil-cement mixtures. The technique of activation analysis using neutrons from an isotopic source was selected for this application. The type,size,and spectrum of the neutron source,the sample size,source-sample geometry,and detector size are the most important parameters determined in this effort. The report also describes other less successful approaches that were explored such as sample analysis using prompt capture gamma rays. Additionally,the suitability of activation and measurement hardware is considered. The laboratory experiments described determined the baseline parameters needed for the required sensitivity and precision. Typical data influencing the configuration of the field system are presented. Design and operational considerations for the field system,especially the activation/shield assembly,follow the discussion of laboratory experiments. One section deals with equipment recommendations with the specific sources of commercially available hardware used in this system being noted. Some preliminary data on the determination of cement in concrete are also given. (Author)