scholarly journals SIGNIFICANT LEVELS OF STEEL SLAG CONCRETE PRODUCED WITH VARYING WATER CEMENT RATIOS

2021 ◽  
Vol 27 (1) ◽  
pp. 13-20
Author(s):  
SOLOMON IDOWU ADEDOKUN ◽  
MUKAILA ABIOLA ANIFOWOSE ◽  
SAMSON OLALEKAN ODEYEMI ◽  
JOHNSON ROTIMI OLUREMI
Keyword(s):  
Analysis Of Variance ◽  
Steel Slag ◽  
P Values ◽  
Anova Test ◽  
Concrete Properties ◽  
Slag Content

This study investigated the significance of steel slag concrete created with varying water cement ratios. Steel slag from Prism Nigeria Limited was used to replace granite (at 0, 40, 50 and 60 %) in concrete. Properties of this modified concrete were examined and its results were exposed to measurable test utilizing Analysis of Variance (ANOVA). The outcome indicated that the compressive and flexural qualities of the concrete increased with increased in slag content but consistently decreased as the water-cement ratios increased. The p-values of the ANOVA test for the models term are significant because they are less than 0.05.

scholarly journals Populasi Telur Nyamuk Aedes sp. Pada Ovitrap yang Diberi Fermentasi Gula sebagai Atraktan Alami di Lingkungan Kampus FMIPA Universitas Lampung

2020 ◽  
Vol 12 (2) ◽  
pp. 109-113
Author(s):  
Sekar Pratiwi ◽  
Emantis Rosa ◽  
Priyambodo Priyambodo ◽  
Tugiyono Tugiyono
Keyword(s):  
Carbon Dioxide ◽  
Key Words ◽  
Research Design ◽  
Analysis Of Variance ◽  
Brown Sugar ◽  
Anova Test ◽  
Random Design ◽  
Sugar Fermentation ◽  
Repeated Analysis

Diseases transmitted by mosquito especially Aedes sp. there’s still happens in many areas of both city and village in Indonesia, until reducing Aedes sp. requires controlled effort. Attractant is a compound that can effect the behavior of mosquito even to decrease the population of mosquito directly.  Sugar fermentation can be a natural attractant, this solution can produce carbon dioxide compound that can be a attract for mosquito, until mosquitoes are attracted to ovitrap.  The purposes of this research was to determined the sugar fermentation to total of Aedes sp. eggs at ovitrap.  The research design used is a Complete Random Design (CRD) with 5 repeated. Analysis of data using Analysis of Variance (ANOVA) and if there are the significant differences of treatment then test continued with BNT test signification levels α = 5%.  The result is indicate that fermentation formula P1 (50 gr brown sugar+ 1 g yeast) found up to 15 mosquitos eggs at ovitrap with a percentage of 50% more than any other formula, ANOVA test indicate that the value of p<0,05 that’s mean there is none significant differences between the treatment.  Key words: Aedes sp.; attractant; sugar fermentation

Effect of Steel Slag on Shrinkage Characteristics of Calcium Sulfoaluminate Cement

2021 ◽  
Vol 1036 ◽  
pp. 263-276
Author(s):  
Hao Ran Huang ◽  
Yi Shun Liao ◽  
Siraj Ai Qunaynah ◽  
Guo Xi Jiang ◽  
Da Wei Guo ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Relative Humidity ◽  
Cement Paste ◽  
Steel Slag ◽  
Autogenous Shrinkage ◽  
Drying Shrinkage ◽  
Chemical Shrinkage ◽  
Calcium Sulfoaluminate Cement ◽  
Calcium Sulfoaluminate ◽  
Slag Content

The effects of steel slag with 0, 10%, 20 % and 40% content on the chemical shrinkage, autogenous shrinkage, internal relative humidity, and drying shrinkage of calcium sulfoaluminate cement paste were studied. The results show that the compressive strength of calcium sulfoaluminate cement paste at an early stage decreases gradually when the content of steel slag increases. When the steel slag content is 0 and 10%, the compressive strength of hardened cement pastes gradually decreases at 90 and 180 days, but the samples with steel slag content of 20% and 40% maintain the compressive strength growth within 180 d. With the extension of curing period, the gap of compressive strength is gradually narrowed. The autogenous shrinkage decreases with the increase of steel slag content and has a good linear relationship with the relative humidity inside the paste. The proportion of autogenous shrinkage to chemical shrinkage is deficient, and most chemical shrinkage occurs in the form of the pore volume. Although the trends of drying shrinkage and autogenous are consistent, the former is more severe than the latter.

scholarly journals Some Insights to the Reuse of Dredged Marine Soils by Admixing with Activated Steel Slag

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Chee-Ming Chan ◽  
Ainun Nazhirin Abdul Jalil
Keyword(s):  
Unconfined Compressive Strength ◽  
Soil Structure ◽  
Marine Ecosystem ◽  
Steel Slag ◽  
Strength Test ◽  
Curing Time ◽  
Strength Gain ◽  
Weak Soil ◽  
Compressive Strength Test ◽  
Slag Content

Regular dredging is necessary for the development of coastal regions and the maintenance of shipping channels. The dredging process dislodges sediments from the seabed, and the removed materials, termed dredged marine soils, are generally considered a geowaste for dumping. However, disposal of the dredged soils offshores can lead to severe and irreversible impact on the marine ecosystem, while disposal on land often incurs exorbitant costs with no guarantee of zero-contamination. It is therefore desirable to reuse the material, and one option is solidification with another industrial waste, that is, steel slag. This paper describes the exploratory work of admixing dredged marine soil with activated steel slag for improvement of the mechanical properties. An optimum activation concentration of NaOH was introduced to the soil-slag mixture for uniform blending. Specimens were prepared at different mix ratios then left to cure for up to 4 weeks. The unconfined compressive strength test was conducted to monitor the changes in strength at predetermined intervals. It was found that the strength does not necessarily increase with higher steel slag content, indicating an optimum slag content required for the maximum solidification effect to take place. Also, regardless of the slag content, longer curing time produces greater strength gain. In conclusion, steel slag addition to dredged sediments can effectively strengthen the originally weak soil structure by both the “cementation” and “filler” effects, though the combined effects were not distinguished in the present study.

Research on Performance of Steel Slag and Porous Cement Concrete Made by Steel Slag Aggregate

2011 ◽  
Vol 214 ◽  
pp. 306-311 ◽  
Author(s):  
Qun Di Liu ◽  
Jia Ying Sun ◽  
Ying Han
Keyword(s):  
Mechanical Properties ◽  
Steel Slag ◽  
Engineering Application ◽  
Physical And Mechanical Properties ◽  
Analysis Method ◽  
Cement Concrete ◽  
Normal Concrete ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
Concrete Properties

Porous cement concrete, which has some superiority in environmental protection compared with normal concrete, has been more widely applied. Performance of Steel Slag and influence of the steel slag aggregate on physical and mechanical properties and durability of porous cement concrete were studied in this paper. Based on study of porous cement concrete properties, the paper puts forward several typical pavement structure forms in engineering application of porous cement concrete from finite element analysis method.

scholarly journals Concrete Properties Comparison When Substituting a 25% Cement with Slag from Different Provenances

2018 ◽  
Author(s):  
María Eugenia Parrón-Rubio ◽  
María Dolores Rubio-Cintas ◽  
Francisca Pérez-García ◽  
Antonio Gonzalez-Herrera
Keyword(s):  
Blast Furnace ◽  
Environmental Sustainability ◽  
Blast Furnace Slag ◽  
Construction Material ◽  
Steel Slag ◽  
High Energy ◽  
Stainless Steel Slag ◽  
Concrete Properties ◽  
Furnace Slag ◽  
By Products

Concrete consumption greatly exceeds the use of any other material in engineering. This is due to its good properties as construction material and the availability of its components. Nevertheless, the present worldwide construction increase and the high-energy consumption for cement production means a high environmental impact. On the other hand, one of the main problem in iron and steel industry is waste generation and by-products that must be properly processed or reused to promote the environmental sustainability. One of these by-products are blast furnace slag. Cement substitution by slag strategy achieves two goals, raw materials consumption reduction and waste management. In the present work, four different concrete mixtures are evaluated. 25% cement is substituted by different blast furnace slag. Tests are made to evaluate the advantages and drawbacks of each mixture. Depending on the origin, characteristics and treatment of the slag, concrete properties change. Certain mixtures provide proper concrete properties. Stainless steel slag produces a fluent mortar that reduces the water consumption whit a slight mechanical strength loss. Mixture with electric arc slag furnace properties are better to the reference concrete (without slag) when slag is treated similarly to the cement.

scholarly journals AMSM-Analysis Of Variance (ANOVA)- Chapter Nine

2018 ◽  
Author(s):  
Mohammed R. Dahman
Keyword(s):  
Conceptual Model ◽  
Analysis Of Variance ◽  
Anova Test

In this chapter we discus in details the introduction of analysis of variance. Followed by the discussion of the Conceptual Model of ANOVA. The four assumptions of ANOVA test have been mentioned as well. Finding ANOVA and conducting the test using an example is done as well.

scholarly journals Study on the Optimum Steel Slag Content of SMA-13 Asphalt Mixes Based on Road Performance

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1436
Author(s):  
Wei Chen ◽  
Jincheng Wei ◽  
Xizhong Xu ◽  
Xiaomeng Zhang ◽  
Wenyang Han ◽  
...  
Keyword(s):  
Dynamic Modulus ◽  
Steel Slag ◽  
Temperature Stability ◽  
Shear Resistance ◽  
High Temperature Stability ◽  
Asphalt Mixes ◽  
Asphalt Mix ◽  
Wheel Tracking ◽  
Temperature Crack ◽  
Slag Content

To reduce the use of aggregates such as limestone and basalt, this paper used steel slag to replace some of the limestone aggregates in the production of SMA-13 asphalt mixes. The optimum content of steel slag in the SMA-13 asphalt mixes was investigated, and the performance of these mixes was evaluated. Five SMA-13 asphalt mixes with varying steel slag content (0%, 25%, 50%, 75%, and 100%) were designed and prepared experimentally. The high-temperature stability, low-temperature crack resistance, water stability, dynamic modulus, shear resistance, and volumetric stability of the mixes were investigated using the wheel tracking, Hamburg wheel tracking, three-point bending, freeze–thaw splitting, dynamic modulus, uniaxial penetration, and asphalt mix expansion tests. The results showed that compared to normal SMA-13 asphalt mixes, the high-temperature stability, water stability, and shear resistance of the SMA-13 asphalt mixes increased and then decreased as the steel slag content increased. All three performance indicators peaked at 75% steel slag content, and the dynamic stability, freeze–thaw splitting ratio, and uniaxial penetration strength increased by 90.48%, 7.39%, and 88.08%, respectively; however, the maximum bending tensile strain, which represents the low-temperature crack resistance of the asphalt mix, decreased by 5.98%. The dynamic modulus of the SMA-13 asphalt mixes increased with increasing steel slag content, but the volume expansion at a 75% steel slag content was 0.446% higher than at a 0% steel slag content. Based on the experimental results, the optimum content of steel slag for SMA-13 asphalt mixes was determined to be 75%.

scholarly journals Misuse of topical corticosteroids in women in Hail region Saudi Arabia

2019 ◽  
Vol 6 (5) ◽  
pp. 1880
Author(s):  
Shumoukh S. Alafnan ◽  
Shooq A. Alhussaini ◽  
Alya A. Alshammarie ◽  
Rasha S. Alshammari ◽  
Halima M. Elagib
Keyword(s):  
Social Media ◽  
Saudi Arabia ◽  
Skin Color ◽  
Age Group ◽  
P Values ◽  
Anova Test ◽  
Statistical Comparison ◽  
Topical Corticosteroids ◽  
Electronic Questionnaires

Background: A lot of women seek to get beautified. Consequently, some of the women often resort to using the products contained corticosteroids (CS) and other kinds of cosmetics, and this significantly increased with year 2018, due to the influence of social media. Despite the benefits, that excessive use of corticosteroids leads to serious side effects.Methods: 769 electronic questionnaires were completed by women for using corticosteroids in Hail, Saudi Arabia. Statistical comparison was done using SPSS (ANOVA test) was used to compare the answers given by the participants and P values less than 0.05 were considered significant.Results: 769 women responded. More than 30.3% of the patients were in the age group 31 to 40 years. The main reason for using the topical corticosteroids was to lighten skin color and reduce wrinkles.Conclusions: Misuse of topical corticosteroids is widely spread among women in Hail city, and this due to various reasons, the most important of which is to get bleaching and get rid of skin blemishes. 

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