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One of the main breakthroughs in the concrete technology in the 20th century was the development of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) as a new generation of sustainable construction material. This paper is presented in two parts. The analysis and design procedures as well as the Environmental Impact Calculations (EIC) of the precast UHPFRC cantilever retaining walls as a sustainable alternative approach to conventional precast Reinforced Concrete (RC) cantilever retaining walls were presented in the first part (Part I) of this paper. In this part (Part II), the reliability of the precast UHPFRC cantilever retaining walls were evaluated through full scale experimental testing. In the experimental tests, four full-scale UHPFRC wall specimens with the dimensions of 2.5 m in height, 2 m in length, and 2 m in width were cast. The area of the steel bars used in the wall stem of the specimens, and the volumetric ratio of the steel fibers used in the UHPFRC mix design were the test parameters. The experimental results proved that the precast cantilever retaining walls manufactured from UHPFRC as a sustainable alternative solution has superior properties in all aspects compared to the conventional precast RC cantilever retaining wall.

Ultra-high Performance Fiber Reinforced Concrete (UHPFRC) is a new generation of cementitious based construction material developed in the mid 1990s that its unique characteristics such as high durability and impermeability, negligible shrinkage/creep and high impact resistance lead to almost maintenance free and direct enhancement of the life-span of a structure. UHPFRC is an ecofriendly and environmentally green construction material which has the capacity to compete not only with conventional Reinforced Concrete (RC) or prestressed concrete design, but it is also able to compete with conventional steel design. This paper is presented in two parts. The first part (Part I) of this paper presents the analysis and design procedures of the precast UHPFRC cantilever retaining walls as a sustainable alternative approach to conventional precast RC cantilever retaining walls. Further, the Environmental Impact Calculations (EIC) of the precast UHPFRC cantilever retaining walls were compared against the conventional precast RC cantilever retaining walls as the benchmark. The second part (Part II) of this paper evaluates the reliability of the precast UHPFRC cantilever retaining walls through experimental tests on full scale UHPFRC wall specimens. The EIC results proved that cantilever retaining walls fabricated from UHPFRC are generally more environmentally sustainable than those built of the conventional RC with respect to the reduction of CO2 emissions, Embodied Energy (EE) and Global Warming Potential (GWP). Finally, advantages of the precast UHPFRC cantilever retaining walls versus the conventional precast RC walls were presented.