2023 Volume 21 Issue Special_Issue Pages S1-S81
One of the primary concerns of concrete engineers in the 21st century is the simultaneous improvement of resilience and sustainability of civil infrastructure. High-performance fiber-reinforced cementitious composites (HPFRCC) are a unique class of fiber-reinforced concrete exhibiting a pseudo strain-hardening (PSH) behavior in tension after first cracking, accompanied by multiple cracking up to relatively high strain levels. The PSH behavior of HPFRCC leads to significant improvement of fracture toughness and energy absorption capacity of the material, which prevents catastrophic failure during extreme events, such as earthquakes and projectile impacts. High cement content is, however, used in ordinary HPFRCC, resulting in high autogenous shrinkage, heat of hydration, and cost. In addition, the associated increase in carbon emissions and embodied energy arising from producing ordinary Portland cement (OPC) can compromise the sustainability credentials of HPFRCC. To tackle this issue, several studies have been conducted in recent years to develop high-performance fiber-reinforced geopolymer composites (HPFRGC) as a sustainable alternative to HPFRCC by completely replacing OPC with geopolymer. Geopolymers, including alkali-activated materials, are sustainable alternative binders to OPC. The development and application of HPFRGC are expected to support the resilience and sustainability of our civil infrastructure simultaneously. This special issue is planned to present the recent advances in the development and application of HPFRGC for sustainable and resilient construction. This special issue includes five pertinent manuscripts. The first manuscript (S-1) focuses on the characterization of HPFRGC, while the second manuscript (S15) presents a micromechanics analysis of HPFRGC. The third manuscript (S28) reports the static and dynamic properties of HPFRGC reinforced with hybrid PVA and recycled steel fibers. The fourth and fifth papers (S43 and S56) focus on the performance of HPFGC reinforced with polypropylene fibers. We hope this special issue inspires concrete researchers and practitioners worldwide toward future research and development in HPFRGC.