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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Browse from hundreds of recorded presentations from ACI Conventions and other concrete industry events.
Tensile Behavior of UHPFRC with Nano-Scale Functionalizing Constituents for Structural Applications in Extremely Aggressive Environments Characterized by Chlorides and Acids
by Liberato Ferrara, Politecnico di Milano
UHPC and UHPFRC: Innovations in Combining High Tensile Strength and High Ductility (ACI Spring 2019 Convention, Québec City, QC, Canada) Current solutions for new concrete constructions in Extremely Aggressive Exposures, as recommended and enforced by design codes, are not considering new cement‐based construction materials, such as Ultra High‐Performance Fiber Reinforced Concrete, neither new constituents specifically conceived to improve the concrete durability, because of the lack of standards and technical awareness by most designers and contractors. The H2020 ReSHEALience project will upgrade to the concept of Ultra High Durability Concrete (UHDC), combining nano‐scale constituents (nano‐cellulose, alumina nanofibers) and self‐healing promoters (crystalline admixtures). The paper will present the approach pursued in the project to design the tensile performance of UHDC mixes as a function of the type and scenario of application, together with a synopsis of the results of ongoing research.
July 13 - 19
Recent Supertall Concrete Towers in the Middle East
by Robert Sinn; and John Peronto, Thornton Tomasetti
International Workshop Session: Design of Super-tall Reinforced Concrete Structures (ACI Fall 2019 Convention, Cincinnati, OH) The Middle East is a location where the will to build tall is readily apparent. Cast-in-place reinforced concrete is the material of choice there for supertall towers to an almost exclusive degree. Two projects—the Jeddah Tower in Saudi Arabia and the Dubai Multi Commodities Centre (DMCC) Uptown development in Dubai—are presented as outstanding examples of contemporary supertall and ultra-tall concrete structures supporting a modern architectural aesthetic of iconic exterior forms. The development of the structural systems as well as details of the high-strength concrete material and construction technology implementation are highlighted for these two large master-planned developments.
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