Design Guide For Improved Quality Of Roadway Subgrades And Subbases
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Design Guide for Improved Quality of Roadway Subgrades and Subbases
The performance of a pavement depends on the quality of its subgrade layers; these foundational layers play a key role in mitigating the effects of climate and the stresses generated by traffic. Therefore, building a stable subgrade and a properly drained subbase is vital for constructing an effective and long lasting pavement system. This manual has been developed to help Iowa highway engineers improve the design, construction, and testing of a pavement system's subgrade and subbase layers, thereby extending pavement life. The manual synthesizes current and previous research conducted in Iowa and other states into a practical geotechnical design guide (proposed as Chapter 6 of the SUDAS Design Manual) and construction specifications (proposed as Section 2010 of the SUDAS Standard Specifications) for subgrades and subbases. Topics covered include the important characteristics of Iowa soils, the key parameters and field properties of optimum foundations, embankment construction, geotechnical treatments, drainage systems, and field testing tools, among others.
Proceedings of the 2025 12th International Conference on Geological and Civil Engineering
This book presents selected papers from 2025 12th International Conference on Geological and Civil Engineering, held in Sapporo, Japan, March 7-9, 2025. The event aims to provide opportunities for the delegates to exchange new ideas and application experiences face to face, to establish business or research relations, and to find global partners for future collaboration. The recent developments in the area of geological and civil engineering are briefly discussed. The topics covered in this book include seismic response and liquefaction modeling, pavement materials and roadway stabilization, advanced design, optimization, and evaluation for concrete and structural systems, intelligent sensing and data-driven solutions for civil infrastructure. The book will be useful for researchers and scholars who are working in the field of geological and civil engineering.