Download or read book Durability Studies of Controlled Low Strength Material Using Native Soils as Fine Aggregates written by Durga Praveen Reddy Vanga and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Controlled Low Strength Material is a self compacted cementitious material used in the field as backfill material, bedding material, trench filling material, bridge abutment and embankment materials. CLSM using native soils as fine aggregates is an effective option in addressing issues relating to strength requirements, sustainability, and project costs. Using native soil in the place of conventional aggregate will reduce the overall project costs and will enhance the sustainability of the project as it eliminates dumping of excavated material in a landfill. CLSM mixes, designed for the particular flowing characteristics as well as the compressive strength requirements should maintain targeted engineering properties throughout its design life period to minimize maintenance costs. Though CLSMs do meet the short term strength requirements, their long-term performance should be verified in order to be successfully used at the actual site, especially when these materials are subjected to seasonal variations such as wetting and drying periods. This research attempts to assess the long-term performance of CLSM through durability studies. CLSMs using native soils from Woodbine, Eagle Ford, Austin Chalk and Queen City Sand geological formations were analyzed in terms of unconfined compressive strength, volumetric strain changes, weight changes and calcium concentration loss through wetting/drying and leachate collection. The effects of soil type and calcium concentration loss on the long-term performance of CLSMs are addressed .Comparative studies between test results on field and laboratory prepared CLSM specimens are conducted to study the effects of preparation methods on the performance of CLSMs. A total of six different CLSM mixes including four CLSMs prepared in the field and two prepared in the laboratory with mix designs developed by a local geotechnical firm were studied in this research. Each of these samples were subjected to durability studies comprising of both wetting/drying durability and leaching. Test results and analysis indicated that CLSM with high plasticity clay was less durable when compared with CLSMs of other soil types. Further recommendations are made for field monitoring of the CLSM sections to validate the laboratory test results.