Long-Term Performance of Conductive-Paint Anodes in Cathodic Protection Systems for Inland Concrete Piers in Virginia

Author(s):  
Gerardo G. Clemeña ◽  
Donald R. Jackson

As part of continuous efforts to identify effective and durable anodes for use in cathodic protection (CP) of reinforced concrete bridge members, a water-based, electrically conductive paint was evaluated for use as the secondary anode in CP systems for inland concrete piers. The paint was used in two CP systems—one designed and built approximately 6 years ago and the other 8 years ago—to protect the concrete piers of two pairs of twin bridges in Virginia. When adjusted properly, the two systems provided more than sufficient protection to the reinforcing steel. Natural paint deterioration occurred in both systems. In the 8-year-old system, this deterioration ranged from 0 to 0.37 percent. In the 6-year-old system, it ranged from 0 to 0.14 percent. Most of the deterioration occurred at the ends of the pier caps, where the concrete is not sheltered from rain by a deck overhang. The overall performance of the conductive paint in these CP systems was better than expected. Its effectiveness could last for at least 15 years, even longer if minor paint deterioration is touched up as early as possible. This type of conductive paint should, therefore, be considered a suitable secondary anode for use in CP of inland concrete piers.

Author(s):  
Robert Worthingham ◽  
Matt Cetiner

TransCanada Pipelines has been using fusion bond epoxy (FBE) external coatings for large diameter line pipe since the early 1980’s. Overall, this coating type, when applied in accordance to the CSA Z245.20 standard provides excellent protection and long term service life. However, some reports from the field described the periodic occurrence of blistering and disbondment of the coating. In order to understand the magnitude and causes of these phenomena, an investigative program was initiated. Laboratory tests and a program of field examinations were carried out. Some of the variables considered were: age of the coating; service temperature; cathodic protection (CP) levels; and soil type. No evidence of a pipeline integrity threat associated with fusion bond epoxy deterioration was found at any of the locations examined. Observations and correlations of coating to exposure conditions will be presented.


2021 ◽  
Author(s):  
Michael Darter

Rapid Strength Concrete (RSC) slabs on six California jointed plain concrete pavement (JPCP) highway projects were surveyed. These projects had been previously surveyed in 2008 at 3-years of age and by 2018 had reached a service life of 13-years. Of the initial 5430 slabs examined in 2008, a total of 1493 RSC slabs, located on 12 traffic lanes, were observed and distress types recorded again in 2018. These slabs included both CTS and 4x4 RSC located in both inner and outer lanes. Only a small percentage (1.4%) of the 5,430 RSC slabs exhibited any distress in 2008 after 3-years' service and the increases were small over the next 10 years of service with the exception of transverse fatigue cracks. The transverse (top down fatigue) type of cracking had the highest percentage and largest increase of any distress type. The heavy truck outside lanes exhibited 21% transversely cracked RSC slabs and the inner passing lanes 3%. The outer truck lanes carried over 3 times more trucks than inner lanes. The RSC slabs were mostly 200-223 mm thick and thus susceptible to fatigue damage. The overall performance of the RSC slabs (both CTS and 4x4 RSC materials) were similar and considered to be outstanding over 13 years with a large majority expected to survive many more years.


1997 ◽  
Vol 506 ◽  
Author(s):  
Vinod Vallikat ◽  
S. David Sevougian ◽  
Jerry A. McNeish

A methodology was developed to determine the effectiveness of different components/barriers in isolating waste from the accessible environment for the potential nuclear waste repository at Yucca Mountain, Nevada [1]. Quantifying the performance offered by different barriers aids in prioritizing the testing and analysis activities aimed at resolving uncertainty in processes and parameters of greatest significance to long-term performance. If a substantial fraction of the overall performance of a repository system may be attributed to the performance of a particular barrier, then it is prudent to devote the necessary resources toward enhancing the confidence in our predictive ability regarding that barrier (through more in-depth characterization and testing).


SIMULATION ◽  
2018 ◽  
Vol 95 (9) ◽  
pp. 873-891
Author(s):  
Xuhui Yu ◽  
Guolei Tang ◽  
Zijian Guo ◽  
Xiangqun Song

The ever-increasing worldwide container throughput and the intensified port competition have demanded better terminal operational performance, which is usually measured by the gross crane rate (GCR). In this paper, a multiagent-based simulation model is proposed to investigate how the block length of the storage yard and the tactical-level stacking policy affect the operational performance of non-transshipment container terminals over the long term. Experiments consider seven block lengths, two yard truck fleet sizes and two stacking policies. The results demonstrate that the best block length yielding the highest GCR is dependent on the stacking policy and the yard truck fleet size, and the separate stacking policy is essentially superior to the scattered stacking policy. Specifically, only when 9-yard trucks are deployed per quay crane under the separate stacking policy, can the typical 42-slot block length achieve the highest GCR. Although the experiments are not exhaustive, they do provide the first fundamental insights, with respect to the effects of block lengths and stacking policies, on the long-term performance at a manually controlled non-transshipment container terminal.


2021 ◽  
Vol 42 ◽  
pp. 102467
Author(s):  
Naveen Krishnan ◽  
Deepak K. Kamde ◽  
Zameel Doosa Veedu ◽  
Radhakrishna G. Pillai ◽  
Dhruvesh Shah ◽  
...  

1999 ◽  
Vol 5 (S2) ◽  
pp. 826-827
Author(s):  
W.K. Collins ◽  
S.D. Cramer ◽  
B.S. Covino ◽  
R.D. Govier ◽  
G.R. Holcomb ◽  
...  

Microanalysis has proved crucial in developing thermal-sprayed metal coatings on the surface of reinforced concrete to serve as anodes in impressed current (ICCP) and galvanic (GCP) cathodic protection systems and in understanding their long-term performance. Corrosion of reinforcing bar in concrete bridges is the primary cause of structural deterioration in high chloride environments such as coastal locations and colder climates where roads are deiced with salt. Over 40 pet of more than 500,000 bridges surveyed in the U.S. are in need of repair or rehabilitation. Cathodic protections is the most effective method of mitigating the effects of corrosion due to chloride contaminated concrete. While a young technology, consumable thermal sprayed zinc anodes (see Figure 1 for a schematic of the process) totaling over 40,000 m2 (430,00 ft2) have been installed on the Oregon coast, primarily on the Depoe Bay, Yaquina Bay, and Cape Creek bridges.


2004 ◽  
Vol 29 (2) ◽  
pp. 39-54
Author(s):  
Ravindra H Dholakia ◽  
Akhilesh S Kumar

In the era of globalization and liberalization, important investment and business decisions have to carefully consider long-term performance and prospects of different national economies. National governments would also compete with one another on the strength of their economic performance and policies. Several organizations make regular efforts to evaluate prospects and rank countries for different purposes but research identifying the top performing economies considering different dimensions of their long-term performance is conspicuous by its absence. Using seven indicators of economic performance of 187 countries, this paper identifies the top 50 performers during the decades of 1981-90 and 1991-2000. Five of these indicators are the trend rates of growth over a decade in imports, foreign direct investment (FDI), capital formation, per capita income, and forex reserves. Average inflation rate and Human Development Index (HDI) are the remaining indicators. The selected indicators are very distinct from one another not only during the decade of eighties but also during the nineties. It is found that economic performance of countries, which was already specialized in a few dimensions, is becoming more specialized and focused during the nineties when compared to the eighties. This paper also examines the inter-relationship among the indicators over time. This study has generated findings for national policy making and for businesses to assess macroeconomic prospects. There are 26 common countries in the two sets of top 50 performers during the eighties and the nineties. High performance on the consumer inflation and/or human development front has emerged practically as a pre-condition for consistently good overall performance. On this count, it appears that a large number of the new entrants to the club of 50 top performers during the nineties are not likely to hold on to their position in the coming decade. Such emerging economies may prove to be risky. The experience of the eighties and the nineties suggests that high inflation during a decade does not deter the solid real economic performance on other dimensions during the same decade but may create problems of maintaining consistency of relative performance over time, if not checked. For predicting the overall performance of countries, past performance does not help in general. However, three indicators, viz., growth of per capita income, growth of FDI, and HDI can be predicted to some extent through past performance on various dimensions. The findings suggest the following: A trade-off exists between high inflation and future high growth and between high inflation and future high HDI. Long-term growth of investment may negatively affect the future long-term growth of output and long-term growth of forex reserves may negatively affect future long-term growth of FDI in a country. Growth causes human capital and not vice-versa. Based on the prediction of partial performance, the study identifies 15 economies likely to be among the top 50 performers in the first decade of the 21st century. Since four of the seven performance indicators do not depend on past performance, the remaining 35 top performers may spring genuine surprises. Economic environment and policies of countries during the decade would decide their relative performance.


2014 ◽  
Vol 10 (1) ◽  
pp. 31
Author(s):  
H. R. Anwar Yamin ◽  
Willy Pravianto ◽  
Hikma Dewita

Preblended asbuton is one of a kind bitumen modification that used in Indonesia. From the results of laboratory tests and field trials scale, obtained that paved using asphalt mixture has better technical properties than conventional asphalt mix made bu asphalt Pen 60. Therefore, in the General Specifications of Highways 2011, this type of asphalt used for dense and  heavy trafficed road. Although the long-term performance of asphaltic mixtures  using preblended asbuton have not been surely known, but until now there has been a lot of road sections in Indonesia have used it. The purpose of this study was to evaluate the long-term field performance of preblended asbuton asphaltic mixtures. To achieve these objectives, filed conditions survey, testing and sampling tests have conducted on several roads that use different preblended asbuton (further named Code-O and Code-B), which has served the traffic from one to three years. In this study, the filed long-term performance of the preblended asbuton asphaltic layer  viewed from the level of damage and aging asphalt development that occurs in the field. Some conclution derived from this study were that preblended asbuton Code-O or Code-B has a good rutting resistance but preblended asbuton Code-B has a better cracking resistance than  Code-O. In terms of short-term aging point of view, preblended asbuton Code-O are better than asphalt Pen 60 and contrary to the Code-B, but for long-term the aging resistance either of preblended asbuton Code-O  or Code-B was relative similar to asphalt Pen 60.


2012 ◽  
Vol 5 (20) ◽  
pp. 587-596 ◽  
Author(s):  
Miroslav Karlíček ◽  
Peter Drábik

Abstract Marketing is a fundamental business function which is directly connected to the company’s long-term performance. However, the marketing function seems to be marginalized in many companies. The main reasons for the relatively low power of the marketing function within the private sector are insufficient control of CMOs over marketing strategy and the marketing mix, lack of convenient measures for capturing the effectiveness and efficiency of marketing investments, the tactical and short-termed orientation of marketing departments, and last but not least the low reputation of the marketing profession. This study analyzes these four factors and proposes steps which can be undertaken by CEOs, marketers themselves and business faculties to leverage the influence of the marketing function and therefore also the overall performance of a company


Author(s):  
Carl Malings ◽  
Rebecca Tanzer ◽  
Aliaksei Hauryliuk ◽  
Provat K. Saha ◽  
Allen L. Robinson ◽  
...  

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