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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-10 of 26706 Abstracts search results
August 16, 2019
ACI Committee 563
This is a Reference Specification that the Architect/Engineer can apply to any construction repair and rehabilitation project involving structural concrete by citing it in the Project Specifications. Mandatory requirements and Optional requirements checklists are provided to assist the Architect/Engineer in supplementing the provisions of this Specification, as required or needed, by designating or specifying individual project requirements. The first section covers general construction requirements for all repair Work. The second section covers shoring and bracing of the structure or member to be repaired, and addresses sequencing of repair Work as the structure is unloaded and reloaded. The third section covers concrete removal and preparation of the concrete substrate for repair, and defines common equipment and methods. The next five sections cover materials and proportioning of concrete; proprietary cementitious and polymer repair materials; reinforcement; production, placing, finishing, and curing of repair materials; formwork performance criteria and construction; treatment of joints; embedded items; repair of surface defects; mockups; and finishing of formed and unformed surfaces. Provisions governing testing, evaluation, and acceptance of repair materials as well as acceptance of the repair Work are included. Sections 9 and 10 incorporate by reference two other specifications—ACI 503.7 and ACI 506.2—into this ACI Standard to cover crack repair by epoxy injection and shotcrete, respectively.
August 8, 2019
The responsibilities for parties involved in a repair project may be significantly different than those traditionally encountered in new concrete construction. The new ACI 562 Code Requirements for Assessment, Repair and Rehabilitation of Concrete Buildings and corresponding ACI 563 Specifications for Repair of Concrete in Buildings identify requirements for the Licensed Design Professional and the contractor’s Specialty Engineer during repair programs. Differing lines of authority in repair are presented through industry practice recommendations and case studies, along with identification of industry needs, informing parties engaged in concrete evaluation and repair projects.
August 5, 2019
ACI Committee 562
ACI 562-19, “Code Requirements for Assessment, Repair and Rehabilitation of Existing Concrete Structures,” was developed to provide design professionals a code for the assessment of the damage and deterioration, and the design of appropriate repair and rehabilitation strategies. The code provides minimum requirements for assessment, repair, and rehabilitation of existing structural concrete buildings, members, systems and where applicable, nonbuilding structures. ACI 562-19 was specifically developed to work with the International Existing Building Code (IEBC) or to be adopted as a stand-alone code.
August 1, 2019
Selecting a curing method for concrete depends on product type and local climate conditions. Polarmatic Oy from Tampere, Finland, provides thermal-energy units for various curing applications including warm, moist air; circulating warm water; and turbosteam. A Polarmatic unit is used by a precast concrete producer in Canada for heating aggregates, curing concrete, heating mixing water, and heating its buildings.
The Peleke Nui, the largest concrete floating dry dock ever built in Southeast Asia, is currently serving international clients from the owner’s base in Hawaii. Shortly after putting the dry dock to sea, it was discovered that the concrete hull was leaking. The owner chose Alchemco’s TechCrete® technology as the repair solution.
The Sustainability Awards program of the National Precast Concrete Association (NPCA) recognizes member companies for contributing to sustainable construction projects and for instituting sustainable practices in their plants.
Jack P. Moehle
ACI Committee 318 has completed the technical work for “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19).” For the present Code cycle, the committee focused on technical changes to improve safety, economy, and sustainability, while introducing new technologies and ideas to advance the concrete industry. The article summarizes some of the key changes for the ACI 318-19 Code.
David M. Mante
Since more designers specify minimum required values for modulus of elasticity (Ec) of concrete, direct measurement of Ec is often justified to confirm adherence to a designer-specified elastic modulus or to validate design assumptions. The purpose of this article is to provide background information regarding Ec, a summary of ASTM C469/C469M testing procedures, and guidance to help test operators avoid common errors associated with this test method.
Ronald L. Kozikowski, Scott M. Tarr, Kevin Rowswell, and Bruce A. Suprenant
Concrete can be exposed to rain at various stages of placements. Being prepared for a rain event allows potential risk to be managed effectively. The article discusses the harmful properties of rainstorms and potential types of damage that can occur. It also provides situational based protection options for managing placements exposed to rain as well as repair methods that can be used if superficial damage occurs despite protective actions.
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