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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 10 Abstracts search results
Document:
CI2411Rooke
Date:
November 1, 2002
Author(s):
Wally Rooke
Publication:
Concrete International
Volume:
24
Issue:
11
Abstract:
Concreting in the winter cold usually means supplementary heat is needed to keep the workers and the concrete warm. But what type of heaters should you be using to avoid carbonation damage to exposed concrete surfaces, such as floor slabs, during placing and the early stages of curing? Whether the heater is placed inside or outside the work enclosure, if the site heater doesn’t have a chimney discharging all combustion gases outside—if you can see the flames or can’t find a flue line to the outdoors—you must be aware of CO2 emissions if you are placing exposed concrete.
CI1904Richardson
April 1, 1997
H. Daryl Richardson and Lloyd E. Rodway
19
4
A detailed engineering assessment of a 32-year-old 300 ft tall, brick-lined reinforced concrete chimney is presented. Tools used for the assessment include infrared photography, Schmidt hammer mapping, x-ray diffraction analysis, strength testing of concrete cylinders, and structural analysis by finite element and classical methods. Design and performance deficiencies are reported, as is the use of high alumina cement concrete not indicated on the engineering drawings. The chimney was found to be suitable for continued service after minor repairs.
CI1612Killion
December 1, 1994
Mark Killion
16
12
Design of smoke stacks for electrical utilities presents a wide range of challenging design issues. Traditionally, these issues are addressed by looking up appropriate eduations in a handbook such as Roark's and generating a manual solution. Geometries which are too complex to fit a formula are normally addressed with general purpose finite element packages. In the last several years, two software packages which provide dramatic improvements over these methods have been used. These programs save time, produce more accurate designs, and minimize the need for testing.
SP138-15
September 1, 1993
Craig Ballinger, Toshikatsu Maeda, and Tokitaro Hoshijima
Symposium Papers
138
Presents information on the development and use of carbon fiber reinforced plastic (CFRP) to strengthen reinforced concrete chimneys, bridge piers, and beams in Japan; bridge beams in Switzerland; and ongoing structural research and use of fiber reinforced plastic (FRP) composite materials to strengthen such structures in the U.S. The concept and equipment for strengthening existing reinforced concrete chimneys by wrapping them with carbon reinforced plastic materials began in Japan. The procedure permitted earthquake-damaged chimneys to be repaired without taking them out of service. Research in Switzerland has led to the use of adhesively bonded sheets of carbon reinforced plastic laminates to strengthen existing bridges. This concept is an extension of use of bonded steel plates to strengthen many types of structures throughout Europe. Research, development, and some use of these techniques has been done in the U.S.
DOI:
10.14359/4263
SP126-47
August 1, 1991
Steven Gebler
126
Addresses shotcrete used primarily for rehabilitating concrete structures. Field experience has demonstrated that the use of detailed specifications and strict on-site surveillance can minimize workmanship problems that have been a concern with the shotcrete process. This paper discusses key points that make the specifications a useful tool. Types of shotcrete quality found in practice are illustrated. Preconstruction testing, ongoing quality control testing during construction, a core grading system, and tensile bond strength tests are discussed. Several brief case histories are presented where the use of the core grading system has proved successful. In the case histories, an independent laboratory conducted evaluations of in-place shotcrete, developed specifications for new work, and provided on-site surveillance during placement. The case histories include a drydock, cooling tower, parking garage, swimming pool, lighthouse, and two chimneys. The system adopted has resulted in structures that should provide durable, long-term service.
10.14359/3807
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