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Over the past four decades, significant advances have been achieved in material science and construction technologies for the construction of dams. Among these, MgO concrete, rock-filled concrete, and roller-compacted concrete have been applied on an increasing trend in the construction of concrete dams. The application of these innovative materials and technologies in arch dam construction makes it possible to omit transverse and longitudinal contraction joints, which can speed up construction progress and reduce project costs. This paper discusses the design and construction features of arch dams constructed without contraction joints, highlighting the role of innovative materialsand associated construction methods.
Available in the following language(s): Spanish
Reefs provide many ecosystem services, such as fish habitats, coastal buffers that help break wave energy, and homes for filter-feeding oysters that improve water quality. Over the last few decades, environmentalists around the world have been incorporating precast concrete into the construction of purpose-built reefs and living shorelines, restoring habitats for marine life and protecting fragile coastlines from storm devastation. The Reef Ball Foundation in Athens, GA, USA, is using precast concrete to revive coastal ecosystems by mimicking natural reefs. This article highlights the foundation’s strategies and projects for worldwide reef restoration.
Available in the following language(s): Spanish
This article addresses questions regarding limestone calcined clay cement (LC3) and calcined clay + Type IL cement (CCIL), answered at the ACI Foundation’s 2025 Concrete Innovation Forum, including what they are, their setting behaviors, how their fresh properties compare to Type I/IL cement, their performance across key durability metrics, and the future of these blends in the concrete industry.
Available in the following language(s): Spanish
This paper re-evaluates existing definitions of tensile strain hardening in ultra-high-performance concrete (UHPC) materials and provides practical guidance for interpreting and reporting tensile stress–strain data, including identification of key parameters relevant to structural applications. This paper provides engineers with an overview of existing methods and recommends an approach that enables objective, consistent interpretation and reporting of the UHPC tensile stress–strain curve to qualify tensile strain-hardening properties for structural applications.
Available in the following language(s): Spanish
The ACI Officers and Board of Direction Members for 2026-2027 were announced, including ACI President Scott M. Anderson, ACI Vice President Anton K. Schindler, and four new Directors elected by the ACI membership. These designations took effect at the conclusion of the Spring 2026 ACI Board of Direction meeting.
Available in the following language(s): Spanish