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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 319 Abstracts search results
Document:
SP356_10
Date:
October 1, 2022
Author(s):
Roberto Rodriguez, Vanessa Benzecry, Steven Nolan, and Antonio Nanni
Publication:
Symposium Papers
Volume:
356
Abstract:
Glass fiber-reinforced polymer (GFRP) bars show promise as a non-corrosive reinforcement alternative for coastal marine applications. Designers are reluctant to use new material systems without guidance or case studies demonstrating successful implementation. For the case of precast concrete piles, the current practice is prestressing with carbon steel strands. In this paper, a seawall replacement project in South Florida allowed for the demonstration of the use of reinforced concrete (RC) piles using GFRP bars and spirals. The field performance of the GFRP-RC piling system was validated by collecting data during driving by means of a pile driving analyzer (PDA). The measured internal stresses in the pile were compared with code requirements and concrete compressive strength determined from laboratory tests. The structural design used for these GFRP-RC piles and field-collected data on pile resistance, stresses, and integrity is presented and discussed in this paper.
DOI:
10.14359/51737269
SP-355_01
July 1, 2022
Gilberto Artioli, Anna Bravo, Stefano Broggio, Giorgio Ferrari, Francesco Santonicola, Francesco Surico, Luca Torelli, Luca Valentini, Andrea Zecchini
355
The new San Giorgio bridge replaced the Polcevera viaduct, built between 1963 and 1967 and collapsed during a storm in summer 2018. The new bridge was designed by Renzo Piano and is made by 19 steel spans supported by 18 concrete pillars. Beside the architectural aspects, special attention was devoted to the mix-design of the pillars, to ensure the production of durable concrete in the marine environment. The use of slag cement combined with limestone filler and polycarboxylate superplasticizers allowed to cast flowable concrete associated with low water to cement ratio and high final compressive strength. A new generation accelerating admixtures, working on the homogeneous nucleation technology, was used to accelerate the cement hydration and gain early compressive strength to speed-up the elevation of the pillars. In the present paper, the advantage of using the new admixture is discussed both in terms of early strength development and microstructure of the cement paste. Beside the improvement of the early strength development, the new admixture reduced the water permeability and the chloride diffusion and improved the resistance to carbonation of the concrete used for the pillars, with further advantages for the durability of this structure.
10.14359/51736007
CI4205ConcreteQA
May 1, 2020
Concrete International
42
Issue:
5
I’m designing a foundation to support a liquefied natural gas (LNG) tank in a marine environment, and I want to use epoxy-coated reinforcement (ECR). In case of a major spill, the pier will be exposed to LNG at cryogenic temperatures. However, per Section 4.7.1 of ACI 376-11,1 deformed reinforcement at service temperatures equal or greater than 0°F (–18°C) must be uncoated. How can I meet the code and protect the reinforcement?
CI4204HistoricConcreteRepair
April 1, 2020
Keith A. Tosolt
4
A workshop held at the 2019 Association for Preservation Technology International conference in Miami, FL, included hands-on demonstrations and presentations. Topics included preservation considerations, developing a guide to historic concrete rehabilitation, investigating deterioration and selecting a repair approach, surface preparation and repair techniques, and preservation of Miami Marine Stadium.
SP337
January 30, 2020
ACI Committee 357 – Offshore and Marine Concrete Structures, Mohammad S. Khan
337
Offshore and marine concrete structures have not received enough attention in the recent past, at least in the United States. The complexity and safety concerns associated with these structures are such that they probably need more attention compared to many other types of concrete structures. Also, offshore and marine concrete structures are so global in nature that there is a higher need for better coordination and synchronization of design, construction, inspection, and maintenance practices in different parts of the world. A two-part session, titled “Offshore and Marine Concrete Structures: Past, Present, and Future,” was held at the Spring 2019 ACI Concrete Convention and Exposition on March 24-28 in Quebec City, Quebec, Canada. The session, sponsored by ACI Committee 357, Offshore and Marine Concrete Structures, highlighted accomplishments of the past, current state-of-the-practice, and a path for the future. This ACI Special Publication (SP) is a compilation of select papers presented at the session. The efforts of all the reviewers in assuring the quality of this publication is greatly acknowledged.
10.14359/51724587
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