Review Article
Ensuring Quality and Consistency in OPC-53 Cement Testing: A Comprehensive Proficiency Testing Evaluation
Shwet Vashishtha*
Issue:
Volume 9, Issue 4, December 2024
Pages:
191-201
Received:
18 September 2024
Accepted:
4 October 2024
Published:
29 October 2024
Abstract: The proficiency testing (PT) program is a critical part of quality assurance in laboratories, especially within industries like construction where cement testing is essential. This study provides a comprehensive evaluation of the fifth PT scheme for Ordinary Portland Cement (OPC) grade 53, conducted by the Nodal Laboratory. The key parameters assessed in this program were standard consistency, compressive strength, and soundness using the Le-Chatelier method. Twenty-four laboratories participated, and their performance was analyzed using advanced statistical methods, adhering to ISO 17043:2010 and ISO 13528:2015 standards. The results showed that most laboratories performed satisfactorily, with only one outlier identified in the soundness test. This paper covers all aspects of the PT program, from sample preparation to the distribution of materials, as well as the homogeneity and stability tests conducted on the samples. Statistical evaluation was carried out using Z-scores, which allowed the laboratories to be ranked according to their performance in each parameter. This method highlights discrepancies and provides a clear framework for participating laboratories to improve their testing procedures. Proficiency testing is essential for maintaining high standards in laboratory performance. It helps standardize testing methods across multiple laboratories, ensuring that OPC-53 cement meets strict quality and performance specifications. The program enables laboratories to identify performance gaps and take corrective actions, ensuring the reliability and accuracy of results. Participation in PT programs is a step toward continuous improvement, keeping laboratories aligned with international standards, ultimately benefiting the broader construction industry by ensuring the structural integrity of buildings and infrastructure. This study underscores the importance of regular PT participation. It not only provides a benchmark for laboratory performance but also ensures compliance with ISO standards. This fosters the consistent quality of cement used in large-scale construction, reducing the risk of structural failures and contributing to long-term safety and durability. The findings demonstrate the positive impact of PT programs on overall testing accuracy and laboratory reliability, emphasizing their role in advancing best practices in the construction industry.
Abstract: The proficiency testing (PT) program is a critical part of quality assurance in laboratories, especially within industries like construction where cement testing is essential. This study provides a comprehensive evaluation of the fifth PT scheme for Ordinary Portland Cement (OPC) grade 53, conducted by the Nodal Laboratory. The key parameters asses...
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Research Article
A Comparative Study on Characteristics and Properties of Food Packaging Film from Cassava Starches of Different Varieties Grown in Ethiopia
Dawit Mamiru,
Endale Werako,
Tayto Mindahun*
Issue:
Volume 9, Issue 4, December 2024
Pages:
202-214
Received:
16 November 2024
Accepted:
28 November 2024
Published:
16 December 2024
Abstract: The present study investigates cassava starches from different Ethiopian varieties for the development of biodegradable food-packaging films. Cassava is a vital food crop in Ethiopia and is, therefore, regarded as a very friendly and renewable raw material for replacing synthetic plastic packaging due to its high starch content. This research work aimed at investigating, comparing the physicochemical, mechanical, and barrier properties of films developed from two different cassava varieties, namely Kello and Qulle. The methodology followed the isolation of starches from cassava root, the evaluation of their characteristics, as well as the pasting behavior. Edible films were prepared by using a casting technique and their mechanical properties included tensile strength and elongation at break, and barrier properties such as water vapor transmission and solubility were determined. From the test results, it can be obtained that Kello variety absorbed more water and had greater swelling power; therefore, it performed better in terms of flexibility. On the other hand, Qulle has a greater tensile strength and less solubility; hence, it will be suitable for dry food packaging. Again, both varieties fulfill minimum mechanical and barrier requirements for the different applications of packaging. Further research is suggested to refine production processes and broaden their applications in the food industry.
Abstract: The present study investigates cassava starches from different Ethiopian varieties for the development of biodegradable food-packaging films. Cassava is a vital food crop in Ethiopia and is, therefore, regarded as a very friendly and renewable raw material for replacing synthetic plastic packaging due to its high starch content. This research work ...
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