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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 14 Abstracts search results
Document:
CI4303Nelson
Date:
March 1, 2021
Author(s):
Yvonne Nelson
Publication:
Concrete International
Volume:
43
Issue:
3
Abstract:
The REACH is a 72,000 ft2 (6700 m2) expansion of the John F. Kennedy Center for the Performing Arts in Washington, DC, USA. It comprises three prominent pavilions connected by studios, classrooms, and a parking structure below an interwoven green roof. It was constructed using a variety of exposed concrete finishes and structural and architectural components. The article provides insights into the execution of some of the project’s outstanding features.
SP-343_22
October 1, 2020
Zani, G.; Colombo, M.; Failla, C.; di Prisco, M.
Symposium Papers
343
A new partially prefabricated elevated slab has been recently introduced in two different industrial buildings, to propose a viable alternative to the classical double tee deck with the addition of an in-situ RC topping. The solution is characterized by an adjustable spacing in the orthogonal direction, 40 mm thick FRC plates used as predalles and a cast-in-place FRC finishing, designed according to a continuous slab resting on the simply-supported beams. The proposed deck is a structural solution that tries to fit different issues like construction speed, transport and cost reduction, structural optimization, high fire resistance (R120) and quality performance. All elements are made of SFRC, characterized by different mix designs. This paper presents a design investigation on this kind of floor element, aimed at optimizing the global structural solution by minimizing the whole floor weight. Longitudinal and transverse bending, as well as vibration limit state, were considered in the design. The optimization strategy will be here presented, through the discussion of the parameters considered in the design, the variables taken into account and the constraints adopted within the procedure. A Model Code 2010 design approach was followed.
CI3607Belkowitz
July 1, 2014
Jon S. Belkowitz, Whitney B. Belkowitz, Matthew A. Best, and Frank T. Fisher
36
7
Colloidal silica (CS) is generally used as a finishing aid and densifier for concrete floors. Recently, tests were undertaken to evaluate CS as an admixture to mitigate alkali-silica reactivity (ASR) in dosages that would not retard early concrete strength development. The article presents development and evaluation of concrete mixtures with CS admixture in the laboratory and on a commercial job site. Field and laboratory tests showed that CS provided increased early strength of Class F fly ash mixtures while reducing ASR expansion.
SP249-08
March 1, 2008
C.A. Menzel
249
class="red">Due to copyright issues, this paper is only available by purchasing the SP-249.
DOI:
10.14359/20129
SP241-04
April 1, 2007
V.T. Cost and G. Knight
241
Abnormal early hydration resulting from "incompatibilities" of common concrete materials can result in erratic set and strength gain behavior and associated finishing, curing, and cracking issues. Contributing influences include high temperatures, cement sulfate levels, Class C fly ash content, chemical admixture use, and design approaches for retardation of hot-weather concrete. Simple, expedient test methods are needed to identify potentially incompatible materials and conditions and to verify appropriate modifications to concrete proportions. Thermal measurements of the early heat development of materials mixtures in the laboratory (semi-adiabatic calorimetry) have been shown very useful toward this end. Abnormal set and strength development of field concrete was reproduced in laboratory paste and mortar mixtures and studied using thermal measurements, verified by parallel mortar cube strengths. Sensitivities of various contributing influences were documented in extensive testing. Changing one or more of the key material or mixture characteristics was usually successful in restoring normal behavior. Recommendations are presented for avoiding related field issues and for the use of calorimetry testing programs for diagnosis of such problems.
10.14359/18650
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