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Ultra-Lightweight Cement Summary Report July 8, 2005 Fred Sabins Issued July 8, 2005 DOE Award Number DE-FC26-00NT40919 Submitted by CSI Technologies 2202 Oil Center Court Houston, TX 77073 Abstract The objective of this project is to develop an improved ultra-lightweight cement. Focus during the project has been on use of ultra-lightweight hollow glass spheres (ULHS) as well as other, more traditional lightweight cement additives to create candidate compositions. These candidate compositions were evaluated in the laboratory through a series of design and performance tests. Field applications of promising ULHS compositions were conducted. This report includes a summary of all results obtained throughout the project.