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Carnot L. Nogueira

Bio: Carnot L. Nogueira is an academic researcher from University of Colorado Denver. The author has contributed to research in topics: Ultimate tensile strength & Computer science. The author has an hindex of 5, co-authored 20 publications receiving 106 citations. Previous affiliations of Carnot L. Nogueira include Federal University of Pernambuco.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a methodology called Bridge Evaluation using Nondestructive Testing (BENT) helps systematically integrate NDE methods and conventional bridge management systems by using a Markovian deterioration model.
Abstract: The City and County of Denver (CCD) Public Works Department owns, inspects, and maintains 531 bridges in its inventory of which 264 are considered major structures spanning over 6.1 m in length. In this paper, a methodology using the CCD major bridge network for the application of nondestructive evaluation (NDE) methods in bridge inspections is explained. The methodology, called Bridge Evaluation using Nondestructive Testing (BENT) helps systematically integrate NDE methods and conventional bridge management systems by using a Markovian deterioration model. Although the BENT method can be applied to timber, steel, and concrete bridges, in this paper the application of the method will be restricted to concrete bridges. The BENT system is part of a comprehensive geographic information system whereby database queries can be completed using a map interface. The database contains a wide array of information in the CCD infrastructure inventory including bridges, pavements, alleys, and street subsystems.

52 citations

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TL;DR: In this article, the authors used ultrasound to evaluate expanded polystyrene (EPS) concrete and found that EPS beads strongly affect the waveforms, leading to a decrease in both longitudinal and shear pulse velocities, and shifting the frequency spectra to lower values.

21 citations

Journal ArticleDOI
TL;DR: A project that has been recently undertaken between the University of Colorado at Denver and the CCD Public Works Department regarding a bridge management system is reported on, providing structure for overall bridge management and also helps preserve and manage historical bridge files.
Abstract: The city and county of Denver, Colorado, (CCD) Public Works Department is in charge of maintaining and inspecting the entire public infrastructure, including approximately 750 bridges. The purpose of this paper is to report on a project that has been recently undertaken between the University of Colorado at Denver and the CCD Public Works Department regarding a bridge management system. The pilot study utilized in the initial stages of this study was applied to bridges located within a small area inside the CCD boundaries. The final prototype is a geographic information system whereby queries on the bridge database can be conducted using a map interface. Ultimately, the geographic information system prototype will become the primary bridge management system for the CCD, containing a wide array of information for all bridges in the CCD's inventory. This includes an application of a Markovian deterioration model for condition assessment prediction and hence budget allocation preparation for all applicable bridges. In general, the system provides structure for overall bridge management and also helps preserve and manage historical bridge files.

11 citations

Journal ArticleDOI
TL;DR: In this paper, the relationship between compressive and shear strength with ultrasonic pulse velocity was examined, and both longitudinal and transverse pulse speeds undergo little variation while applied shear stresses increase.

10 citations

Journal ArticleDOI
TL;DR: Aluminum has become a structural material widely used not only in mechanical and aerospace engineering, but also, more recently, in civil engineering as mentioned in this paper, because of its structural properties, it is a suitable material for many applications.
Abstract: Aluminum has become a structural material widely used not only in mechanical and aerospace engineering, but also, more recently, in civil engineering. Because of its structural properties—s...

9 citations


Cited by
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01 Jan 2004
TL;DR: In this paper, the authors review the research to date related to probabilistic models for maintaining and optimizing the lifecycle performance of deteriorating structures and formulates future directions in this field.
Abstract: Summary In comparison with the well-researched field of analysis and design of structural systems, the lifecycle performance prediction of these systems under no maintenance as well as under various maintenance scenarios is far more complex, and is a rapidly emergent field in structural engineering. As structures become older and maintenance costs become higher, different agencies and administrations in charge of civil infrastructure systems are facing challenges related to the implementation of structure maintenance and management systems based on life-cycle cost considerations. This article reviews the research to date related to probabilistic models for maintaining and optimizing the lifecycle performance of deteriorating structures and formulates future directions in this field.

332 citations

Journal ArticleDOI
TL;DR: In this paper, the authors reviewed the research to date related to probabilistic models for maintaining and optimizing the life-cycle performance of deteriorating structures and formulates future directions in this field.
Abstract: In comparison with the well-researched field of analysis and design of structural systems, the life-cycle performance prediction of these systems under no maintenance as well as under various maintenance scenarios is far more complex, and is a rapidly emergent field in structural engineering As structures become older and maintenance costs become higher, different agencies and administrations in charge of civil infrastructure systems are facing challenges related to the implementation of structure maintenance and management systems based on life-cycle cost considerations This article reviews the research to date related to probabilistic models for maintaining and optimizing the life-cycle performance of deteriorating structures and formulates future directions in this field

318 citations

Journal ArticleDOI
TL;DR: In this paper, the authors reviewed several available NDT methods developed and used in the last few decades for monitoring the condition of concrete infrastructures and evaluated the effectiveness of these methods.
Abstract: The deterioration of concrete structures in the last few decades calls for effective methods for condition evaluation and maintenance. This resulted in development of several nondestructive testing (NDT) techniques for monitoring civil infrastructures. NDT methods have been used for more than three decades for monitoring concrete structures; now it has been recognized that NDT plays an important role in the condition monitoring of existing RC structures. NDT methods are known to be better to assess and evaluate the condition of RC structures practically. This paper reviewed several available NDT methods developed and used in the last few decades.

137 citations

Journal ArticleDOI
TL;DR: In this paper, a comparative study of different curing regimes, namely, standard curing (SC), internal curing (IC) with polyethylene glycol (PEG) and air curing (AC), used in ultra-high-performance concrete (UHPC) premixed with different types of nanomaterials was presented.
Abstract: This research presents a comparative study of different curing regimes, namely, standard curing (SC), internal curing (IC) with polyethylene glycol (PEG) and air curing (AC), used in ultrahigh-performance concrete (UHPC) premixed with different types of nanomaterials. Four types of nano waste materials were prepared, i.e. milled nano-metakaolin (NMK), nano waste glass (NWG) and nano rice husk ash (NRHA) and chemically prepared nano silica (NS). Several UHPC mixes with nanomaterial dosages (1%, 2% and 3%) were investigated. Compressive strength , ultrasonic pulse velocity , sulphate attack and microstructure were analysed. Results indicated the similarity between the performance of SC and IC in NS, NWG and NMK. Moreover, the addition of PEG exerted a negative effect on NRHA. Compressive strength increased by 17%, 24%, 14% and 13% under IC in NWG, NRH, NMK and NS, respectively. By contrast, sorptivity decreased by 84%, 60%, 48% and 60% in NS, NMK, NWG and NRHA under IC.

87 citations

Journal ArticleDOI
TL;DR: In this article, the optical and contactless DIC technique was used for the examination of fracture processes in concrete with fly ash under shear loading, and the results showed that unmodified concrete are characterised by greater brittleness, whereas composites made on the basis of the binary binder behave as quasi-plastic materials in the fracture process.

79 citations