Investigating States of Locally Manufactured Steel Reinforced Bars through Mechanical and Chemical Analysis

2020 ◽  
Vol 1013 ◽  
pp. 125-131
Author(s):  
Taha Waqar ◽  
Faramarz Djavanroodi
Keyword(s):  
Tensile Strength ◽  
Chemical Composition ◽  
Control Charts ◽  
Experimental Tests ◽  
International Standards ◽  
Accurate Information ◽  
Steel Bars ◽  
Different Types ◽  
Reinforced Steel ◽  
Manufacturing Stage

Steel reinforced bars are increasingly becoming important and demanding for their role in reinforced concrete structures for which accurate information about their properties and chemical composition is becoming essential during the manufacturing stage. The minimum required properties of the bars is determined with the aid of international standards such as ASTM A615 within Saudi Arabian manufacturers. In this work, the variation within the mechanical properties and chemical composition of various reinforced steel produced in KSA was evaluated. Experimental tests were performed on ASTM A615 Grade 60 samples to obtain their yield, tensile strength, elongation and chemical composition. Statistical analysis showed the selected properties follow different types of continuous distributions for their respective cases. Finally, control charts have been generated to identify results falling above and below 3-sigma. Results showed that 1.5%, 3% and 7.3% of samples failed to meet the minimum ASTM criteria for yield, tensile strength and weight; while less than 3% of steel bars failed to meet ASTM standards for chemical composition.

Mechanical Behaviour of CoCrMo Alloy with Si Content

2015 ◽  
Vol 754-755 ◽  
pp. 1017-1022 ◽  
Author(s):  
Petrică Vizureanu ◽  
Mirabela Georgiana Minciună ◽  
Dragoş Cristian Achiţei ◽  
Andrei Victor Sandu ◽  
Kamarudin Hussin
Keyword(s):  
Tensile Strength ◽  
Chemical Composition ◽  
Testing Machine ◽  
Base Material ◽  
Optical Emission ◽  
Experimental Tests ◽  
Optical Emission Spectrometry ◽  
Emission Spectrometry ◽  
Standard Samples

.The paper present aspects about the obtaining of non-precious dental alloys (type CoCrMo and CoCrMoSi7), the determination of chemical composition by optical emission spectrometry and the experimental tests for determining the tensile strength, made on standard plate samples. The base material used in experiments was a commercial alloy, from CoCrMo system, which belongs to the class of dental non-precious alloys, intended to medical applications. The obtaining of studied alloy was made on arc re-melting installation, under vacuum, type MRF ABJ 900. The process followed to realize a rapid melting, with a maximum admissible current intensity. The samples for tests were obtained by casting in an electric arc furnace, under vacuum, in optimal conditions for melting and solidification and processing by electro-erosion, to eliminate all the disturbing factors which come by processing conditions for the samples. The determination of chemical composition for cobalt based alloys, by optical emission spectrometry, was made on SpectromaxX equipment with spark. The electrical discharge is made with the elimination of an energy quantity, fact which determine plasma forming and light issue. Tensile tests for standard samples, made from cobalt based alloy, was made on Instron 3382 testing machine, and assisted by computer. The obtained results are: elongation, elasticity modulus, tensile strength and offer complete information about the analyzed mechanical properties. For the certitude of obtained experimental results, the tests were made on samples with specific dimensions according ISO 6892-1:2009(E) standard, both for the tensile strength, and also machine operation.

scholarly journals The Influence of Hot-Dip Galvanizing on the Mechanical Properties of High-Strength Steels

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5219
Author(s):  
Milan Šmak ◽  
Jaroslav Kubíček ◽  
Jiří Kala ◽  
Kamil Podaný ◽  
Jan Vaněrek
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Chemical Composition ◽  
Yield Strength ◽  
High Strength Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Steel Members ◽  
Different Types ◽  
Standard Quality

Modern high-strength steels achieve their strength exclusively through the manufacturing process, as the chemical composition of these steels is very similar to the composition of standard-quality steels. Typically, hot-dip galvanizing is used to form a protective zinc layer on the steel parts of structures; nonetheless, the material is exposed to high temperatures during the process. With high-strength steels, this can lead to deterioration of the mechanical properties. This study aims to experimentally examine and evaluate the extent of deterioration of the mechanical properties of high-strength-steel members. The effect was studied on specimens made of three different types of steel with the yield strength ranging from 460 to 1250 MPa. For each type of steel, selected mechanical properties—yield strength, tensile strength, and hardness—were determined on specimens with and without hot-dip galvanization, and the obtained results were mutually compared. Our study shows a significant impact of the hot-dip galvanization process on the mechanical properties of some high-strength steels. With the studied types of steel, the yield strength decreased by up to 18%, the tensile strength by up to 13%, and the hardness by up to 55%.

Mechanical Properties Evaluation of Render Mortars with Different Waterproof Additive Compositions

2021 ◽  
Vol 880 ◽  
pp. 161-167
Author(s):  
Joaquin Humberto Aquino Rocha ◽  
Fernando Palacios Galarza
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Flexural Strength ◽  
Direct Effect ◽  
Compression Strength ◽  
Negative Impact ◽  
Experimental Tests ◽  
Strength Tests ◽  
Different Types ◽  
The Common

Waterproof additives and bonding agent mixtures are commonly employed in the setting up of render mortars. This practice often shows beneficial results, enhancing the properties of the common mortars. Yet, the use of these additives does not seem to have a direct effect on the mechanical properties of the mortars. This study thus aims to evaluate the influence of the use of waterproof and adhesion additives on the mechanical properties of render mortars. Based on their chemical composition, three different types of mortar admixtures were evaluated, using fourfold additive-mortar weight ratios: 0%, 1.5%, 3%, and 5%. Compressive and flexural strength tests were conducted after 28 days. The results showed a negative impact on the mechanical properties of the mortars. The lowest flexural and compression strength values reported are 1.52 and 4.57 (MPa), respectively. However, all compressive and flexural strength values lied within the limit range recommended by the “Mortars applied on walls and ceilings” construction code (i.e., ABNT NBR 13281). It is compulsory to continue the experimental tests to determine render mortars mechanical properties with higher waterproof additive-mortar weight ratios since higher ratios might produce mortars with non-allowed mechanical properties.

Influence of small intestine wall changes after electrically welded anastomoses of different types for the anastomotic tensile strength

2018 ◽  
Vol 0 (3) ◽  
pp. 57-62
Author(s):  
S. S. Podpriatov ◽  
S. E. Podpryatov ◽  
S. G. Gichka ◽  
V. G. Getman ◽  
A. V. Makarov ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Small Intestine ◽  
Different Types

CRIMINAL LAW IN PROTECTION OF HEALTH FROM THE ABUSE OF DRUGS IN SERBIA

2018 ◽  
Vol 28 (6) ◽  
pp. 1939-1946
Author(s):  
Miodrag Simović ◽  
Dragan Jovašević ◽  
Marina M. Simović
Keyword(s):  
United Nations ◽  
Criminal Law ◽  
International Standards ◽  
Individual State ◽  
Criminal Sanctions ◽  
Criminal Offenses ◽  
Different Types ◽  
The Republic ◽  
To Come ◽  
Practical Sense

Based on international standards adopted within the framework and under the Organisation of the United Nations, all national legislations recognise several different types and forms of criminal acts regarding misuse of narcotics. It is the matter of various activities of unauthorized production, traffic and other forms of inciting or enabling others to come into possession of narcotics for immediate use, which seriously endangers the health and life.Depending on the needs of each individual state, the distinction is made between the offenses, for the perpetrators are given different types and measures of penalties and other criminal sanctions. A similar situation exists in the Republic of Serbia.The paper analyzes the system of criminal offenses in various types and forms of manifestation in the theoretical and practical sense for whose offenders that are prescribed serious criminal sanctions.

The Chemical Decontamination Process Intensification, using Ultrasounds

2008 ◽  
Vol 59 (9) ◽  
Author(s):  
Eugenia Pantru ◽  
Gheorghit Jinescu ◽  
Rozalia R�dulescu ◽  
Antoneta Filcenco Olteanu ◽  
Cosmin Jinescu
Keyword(s):  
Chemical Composition ◽  
Process Intensification ◽  
Sulphuric Acid Solution ◽  
Liquid Ratio ◽  
Polluted Soils ◽  
Chemical Decontamination ◽  
First Case ◽  
Ultrasound Field ◽  
Different Types ◽  
Main Factors

This paper presents an intensive procedure used for the decontamination of the soils, which were radioactively contaminated by uranium, due to the occurrence of some antropic accidents, in order to limit the area�s pollution. The procedure used for the chemical decontamination of the polluted soils was the washing one and the decontamination degree is comparatively presented depending on the ultrasounds� presence and absence. The lab testes were performed on five types of soils , which were characterized from the granulometric, structural and chemical composition viewpoint, all these aspects represent the main factors, which determine the applied decontamination procedure�s limits and performances correlated with its utilization costs. The decontamination procedure�s kinetics for each type of soils was analyzed, using successively three different types of reagents (water, 0.1 M sulphuric acid solution and chloro-sodic solution � 100 g/L sodium chloride + 10 g/L sodium carbonate in water) for a solid to liquid ratio of 1:2, during 2 h, at a temperature of 20oC in a mechanic stirring system respectively in ultrasounds field. It was observed that the decontamination degree increases with up to 15-20% in case of the ultrasound field utilization comparing to the first case.

Sign in / Sign up

Export Citation Format

Share Document