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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 1-5 of 18 Abstracts search results
Document:
SP143-03
Date:
May 1, 1994
Author(s):
R.L. Nigbor
Publication:
Symposium Papers
Volume:
143
Abstract:
This review paper discusses current and near-future technologies for measurement of full-scale structural performance. Modern instrumentation and measurement methodologies can provide signals and data for use in evaluating the performance of civil structures. Applications exist in model verification, extreme event monitoring, health monitoring, and serviceability monitoring. Examples are provided, and future developments are discussed.
DOI:
10.14359/10046
SP143
Editors: David J. Stevens and Mohsen A. Issa
SP-143 Concrete is a truly unique material, exhibiting a wide range of mechanical, physical, and chemical properties, which in turn, are affected by the type of load condition, the constituents, the local environment, the processing method, the structural application, etc. Because of this complex behavior, it is crucial that accurate and meaningful experimental methods be developed and used, in order to efficiently utilize concrete, to guarantee the public's safety, and to minimize cost. This is particularly true in the 1990s, as new and novel concretes, admixtures, and reinforcements are developed.
10.14359/14183
SP143-04
B. Massicotte and A. Picard
Describes details of an extensive monitoring program carried out during the strengthening of the Grand Mere Bridge, a cast-in-place post-tensioned segmental box girder structure built in 1977. The testing program comprised various measurements taken before, during, and after the prestressing application. Electrical strain gages, mechanical strain gages, vibrating wire gages, and thermocouples were among the measuring instruments used. A bridge testing data acquisition system in a vehicle and an autonomous data acquisition system were used, together with manual reading devices. The field measurement program was carried out during strengthening. Some instruments used allow the monitoring of the bridge over a long-term period.
10.14359/4608
SP143-06
M. Sugita, H. Yanagida, and N. Muto
Carbon fiber glass fiber reinforced plastic (CFGFRP) is used in concrete structures as a reinforcement material. Appropriate materials design indicates that CFGFRP should be a hybrid of a conductive material with a small ultimate elongation value and an insulating material with a large ultimate elongation value. In the present study, the authors evaluated three types of carbon fiber tows used in CFGFRP composites. They observed a very clear and significant change in electrical resistance at the transition point where carbon fiber tows fractured, and found that this point could be easily controlled though the use of carbon fibers with different ultimate elongation values. The electrical resistance characteristics of CFGFRP-reinforced concrete change along with changing loads. Furthermore, a permanent residual electrical resistance could be observed after the removal of load, and its change was dependent on the maximum load applied. The information on the fracture position was obtained by the arrangement of the CFGFRP composites. Monitoring changes in electrical resistance during and after loading is thus a promising method for anticipating the fracture of CFGFRP-reinforced concrete.
10.14359/4317
SP143-12
S. Popovics, R. Silva-Rodrigez, J. S. Popovics, and V. Martucci
Describes a laboratory investigation of an ultrasonic method that has the potential to become, through further research, a valuable tool for the nondestructive quality control of concrete during construction. The primary objective of the work is to characterize the development of internal structure of the portland cement paste portion of concrete from very early ages on by making use of the behavior of propagated ultrasonic pulses. To do that, however, a suitable ultrasonic method first had to be developed, since quite a few publications reported difficulties with such measurements in fresh pastes due to high attenuation. Velocity and attenuation of longitudinal ultrasonic pulses were measured at regular intervals in fresh concretes. The first measurements were usually performed 10 min after mixing and continued up to the age of 28 days. Three concretes of different compositions were tested. This paper concentrates on measurements at very early ages. The instrumentation, test setup, and testing procedure are described. The velocity and attenuation results, as well as their interpretation, are then presented. For instance, it is shown that the time of initial set is close to a minimum on the pulse velocity-versus-age relationship, as well as a maximum on the attenuation-versus-age relationship.
10.14359/4318
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