Non destructive determination of the free chloride content in cement based materials

The purpose of this study is to establish an analytical formulation for determination of the critical chloride content in concrete. In this study, factors affecting the critical chloride content such as mix proportion, environment, chemical evolution of pore solution with time, carbonation and so on are taken into account. The numerical simulation program of cementitious materials, HYMOSTRUC was utilized for the construction of the formulation. This was expressed as a free chloride content in a mass unit of concrete as a time function.

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Characterization of Impressed Current Technique to Model Corrosion of Reinforcement in Concrete

Journal of Engineering Science ◽

10.3329/jes.v11i1.49551 ◽

2020 ◽

Vol 11 (1) ◽

pp. 93-99

Author(s):

Abu Zakir Morshed ◽

Sheikh Shakib ◽

Tanzim Jahin

Keyword(s):

Immersion Time ◽

Chloride Content ◽

Engineering Science ◽

Coastal Regions ◽

Faraday’S Law ◽

Current Technique ◽

Corrosion Cell ◽

Impressed Current

Corrosion of reinforcement is an important durability concern for the structures exposed to coastal regions. Since corrosion of reinforcement involves long periods of time, impressed current technique is usually used to accelerate the corrosion of reinforcement in laboratories. Characterization of impressed current technique was the main focus of this research,which involved determination of optimum chloride content and minimum immersion time of specimens for which the application of Faraday’s law could be efficient. To obtain optimum chloride content, the electrolytes in the corrosion cell were prepared similar to that of concrete pore solutions. Concrete prisms of 200 mm by 200 mm by 300 mm were used to determine the minimum immersion time for saturation. It was found that the optimum chloride content was 35 gm/L and the minimum immersion time for saturation was 140 hours. Accounting the results, a modified expression based on Faraday’s law was proposed to calculate weight loss due to corrosion. Journal of Engineering Science 11(1), 2020, 93-99

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Stoichiometric Determination of Graphite Intercalation Compounds Using Rutherford Backscatiering Spectrometry

MRS Proceedings ◽

10.1557/proc-27-481 ◽

1983 ◽

Vol 27 ◽

Author(s):

L. Salamanca-Riba ◽

B.S. Elman ◽

M.S. Dresselhaus ◽

T. Venkatesan

Keyword(s):

Experimental Error ◽

Rutherford Backscattering Spectrometry ◽

Rutherford Backscattering ◽

Intercalation Compounds ◽

Graphite Intercalation Compounds ◽

X Ray ◽

Donor And Acceptor ◽

Graphite Intercalation ◽

Non Destructive

ABSTRACTRutherford backscattering spectrometry (RBS) is used to characterize the stoichiometry of graphite intercalation compounds (GIC). Specific application is made to several stages of different donor and acceptor compounds and to commensurate and incommensurate intercalants. A deviation from the theoretical stoichiometry is measured for most of the compounds using this non-destructive method. Within experimental error, the RBS results agree with those obtained from analysis of the (00ℓ) x-ray diffractograms and weight uptake measurements on the same samples.

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Application of EDS Technique for OSP Film Thickness Measurement

ISTFA 2006: Conference Proceedings from the 32nd International Symposium for Testing and Failure Analysis ◽

10.31399/asm.cp.istfa2006p0193 ◽

2006 ◽

Author(s):

Prong Kongsubto ◽

Sirarat Kongwudthiti

Keyword(s):

Thin Film ◽

Quantitative Analysis ◽

Joint Strength ◽

Critical Factor ◽

Thickness Measurement ◽

Ic Manufacturing ◽

And Control ◽

Film Thickness Measurement ◽

Non Destructive

Abstract Organic solderability preservatives (OSPs) pad is one of the pad finishing technologies where Cu pad is coated with a thin film of an organic material to protect Cu from oxidation during storage and many processes in IC manufacturing. Thickness of OSP film is a critical factor that we have to consider and control in order to achieve desirable joint strength. Until now, no non-destructive technique has been proposed to measure OSP thickness on substrate. This paper reports about the development of EDS technique for estimating OSP thickness, starting with determination of the EDS parameter followed by establishing the correlation between C/Cu ratio and OSP thickness and, finally, evaluating the accuracy of the EDS technique for OSP thickness measurement. EDS quantitative analysis was proved that it can be utilized for OSP thickness estimation.

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