ACI 533.5R-20 (IN-LB, SI) PDF Download

ACI 533.5R-20 is a standard titled "Guide for Precast Concrete Tunnel Segments." The standard addresses the growing trend towards mechanization and automation in construction, particularly in tunneling projects. It highlights the advantages of using precast concrete segmental lining in mechanized tunneling, such as improved occupational health and safety, faster progress rates, and reduced labor requirements.

The standard acknowledges the lack of comprehensive industry-wide guidance for precast concrete tunnel segments and aims to fill this gap. It incorporates the latest developments and practical experience in the field, as well as information on all aspects of design and construction. The guidelines provided in the standard are based on the knowledge and experience gained from various precast tunnel projects in the United States, as well as relevant national and international references commonly used in the industry.