scholarly journals Effect of Amorphous Metallic Fibers on Strength and Drying Shrinkage of Mortars with Steel Slag Aggregate

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5403
Author(s):  
Ji-Hwan Kim ◽  
Sung-Ho Bae ◽  
Se-Jin Choi
Keyword(s):  
Sustainable Development ◽  
Construction Industry ◽  
Steel Slag ◽  
Control Sample ◽  
Reduction Rate ◽  
Drying Shrinkage ◽  
Fine Aggregate ◽  
Remarkable Effect ◽  
The Difference ◽  
Metallic Fibers

Recently, with increasingly stringent environmental regulations and the depletion of natural aggregate resources, high-quality aggregates have become scarce. Therefore, significant efforts have been devoted by the construction industry to improve the quality of concrete and achieve sustainable development by utilizing industrial by-products and developing alternative aggregates. In this study, we use amorphous metallic fibers (AMFs) to enhance the performance of mortar with steel slag aggregate. Testing revealed that the 28-day compressive strength of the sample with steel slag aggregate and AMFs was in the range of 48.7–50.8 MPa, which was equivalent to or higher than that of the control sample (48.7 MPa). The AMFs had a remarkable effect on improving the tensile strength of the mortar regardless of the use of natural aggregates. With AMFs, the drying shrinkage reduction rate of the sample with 100% steel slag aggregate was relatively higher than that of the sample with 50% natural fine aggregate. Furthermore, the difference in the drying shrinkage with respect to the amount of AMFs was insignificant. The findings can contribute to sustainable development in the construction industry.

scholarly journals Green building as a direction of sustainable development: essence, tasks, principles, benefits, prospects

2021 ◽  
pp. 64-71
Author(s):  
V. Bilotil
Keyword(s):  
Climate Change ◽  
Sustainable Development ◽  
Construction Industry ◽  
Green Building ◽  
Sustainable Construction ◽  
Green Construction ◽  
Current State ◽  
Development Goals ◽  
The Difference ◽  
The Impact

The construction industry plays an important role in achieving the UN Sustainable Development Goals and reducing the impact on climate change through the introduction of green building principles. So the article has been devoted to this type of construction as an important area of sustainable development. The interaction of climate change and construction activities has been substantiated in the article. Tasks and principles of sustainable construction have been analyzed. The economic, ecological and social benefits of green construction have been studied. The difference between traditional and green construction has been described. The current state of development of sustainable construction in Ukraine and the world has been considered. Prospects for green construction in Ukraine have been identified. The urgency and necessity of its implementation in our country have been proved.

scholarly journals Comparison of Drying Shrinkage of Concrete Specimens Recycled Heavyweight Waste Glass and Steel Slag as Aggregate

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5084
Author(s):  
So Yeong Choi ◽  
Il Sun Kim ◽  
Eun Ik Yang
Keyword(s):  
Prediction Models ◽  
Steel Slag ◽  
Drying Shrinkage ◽  
Shrinkage Strain ◽  
Waste Glass ◽  
Fine Aggregate ◽  
Model Code ◽  
Fundamental Properties ◽  
Substitution Ratio ◽  
Experimental Values

This study analyzed the fundamental properties of concrete using steel slag, to test its viability as an aggregate material. An experimental investigation into the effect of steel slag as a coarse aggregate, and heavyweight waste glass as a fine aggregate, on the drying shrinkage of concrete was performed. The calculated shrinkage strain was compared to five different shrinkage prediction models, namely, the ACI 209, B3, KCI 2012, EC 2 and GL 2000 model codes, to evaluate their ability to accurately predict shrinkage behavior. From the results, the elastic modulus of concrete increased with the increase in steel slag substitution ratio, however drying shrinkage decreased. The predictive value of the existing prediction model of drying shrinkage differed from the experimental values, and requires correction to improve its accuracy. The B3 model code showed the best prediction results of drying shrinkage.

scholarly journals Risk Perception in the Construction Industry: Differences Between Italian and Migrant Workers Before and After a Targeted Training Intervention

2021 ◽  
Vol 31 (1) ◽  
pp. 65-71
Author(s):  
Federico Ricci ◽  
Giulia Bravo ◽  
Alberto Modenese ◽  
Fabrizio De Pasquale ◽  
Davide Ferrari ◽  
...  
Keyword(s):  
Risk Perception ◽  
Construction Industry ◽  
Migrant Workers ◽  
Construction Workers ◽  
Construction Sites ◽  
Visual Tool ◽  
Occupational Risks ◽  
Linguistic Barriers ◽  
Before And After ◽  
The Difference

We developed a visual tool to assess risk perception for a sample of male construction workers (forty Italian and twenty-eight immigrant workers), just before and after a sixteen-hour training course. The questionnaire included photographs of real construction sites, and workers were instructed to select pictograms representing the occupational risks present in each photograph. Points were awarded for correctly identifying any risks that were present, and points were deducted for failing to identify risks that were present or identifying risks that were not present. We found: (1) Before the course, risk perception was significantly lower in immigrants compared to Italians ( p < .001); (2) risk perception improved significantly ( p < .001) among all workers tested; and (3) after the training, the difference in risk perception between Italians and immigrants was no longer statistically significant ( p = .1086). Although the sample size was relatively small, the results suggest that the training is effective and may reduce the degree to which cultural and linguistic barriers hinder risk perception. Moreover, the use of images and pictograms instead of words to evaluate risk perception could also be applied to nonconstruction workplaces.

scholarly journals Post-Industrial Tourism as a Driver of Sustainable Development

2021 ◽  
Vol 13 (15) ◽  
pp. 8145
Author(s):  
Aleksandra Kuzior ◽  
Oleksii Lyulyov ◽  
Tetyana Pimonenko ◽  
Aleksy Kwilinski ◽  
Dariusz Krawczyk
Keyword(s):  
Sustainable Development ◽  
Tourism Development ◽  
Tourism Industry ◽  
Digital Marketing ◽  
Gender And Education ◽  
Development Goals ◽  
The Difference ◽  
Post Industrial ◽  
The Impact ◽  
Industrial Tourism

The accepted Sustainable Development Goals aim at reorienting the tourism industry to sustainable tourism and enhancing post-industrial tourism. In this case, it is necessary to identify the statistically significant determinants which affect post-industrial tourism development. In this paper, we aim to analyse: (1) the impact of economic and environmental dimensions, and of digital marketing on supporting post-industrial tourism development and (2) the difference between attitude to post-industrial tourism on the gender, age, and education dimensions and digital channels on post-industrial tourism development. The data was collected from questioning 2334 respondents during April–November 2020. The study applied the following methods: frequencies, percentages, t-test, and one-way ANOVA and multiple regression analysis. The findings confirmed the statistically significant impact of the economic and environmental dimensions, as well as digital marketing on post-industrial tourism development. The results of the analysis justified that digital marketing was a catalysator of post-industrial tourism development. In addition, the findings confirmed that there is no difference in attitudes towards post-industrial tourism with respect to the dimensions of age, gender, and education.

scholarly journals Effect of Fly Ash on Compressive Strength, Drying Shrinkage, and Carbonation Depth of Mortar with Ferronickel-Slag Powder

2021 ◽  
Vol 11 (3) ◽  
pp. 1037
Author(s):  
Se-Jin Choi ◽  
Ji-Hwan Kim ◽  
Sung-Ho Bae ◽  
Tae-Gue Oh
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Construction Industry ◽  
Bituminous Coal ◽  
Raw Materials ◽  
Drying Shrinkage ◽  
The Other ◽  
Test Results ◽  
Slag Powder ◽  
Ferronickel Slag

In recent years, efforts to reduce greenhouse gas emissions have continued worldwide. In the construction industry, a large amount of CO2 is generated during the production of Portland cement, and various studies are being conducted to reduce the amount of cement and enable the use of cement substitutes. Ferronickel slag is a by-product generated by melting materials such as nickel ore and bituminous coal, which are used as raw materials to produce ferronickel at high temperatures. In this study, we investigated the fluidity, microhydration heat, compressive strength, drying shrinkage, and carbonation characteristics of a ternary cement mortar including ferronickel-slag powder and fly ash. According to the test results, the microhydration heat of the FA20FN00 sample was slightly higher than that of the FA00FN20 sample. The 28-day compressive strength of the FA20FN00 mix was approximately 39.6 MPa, which was higher than that of the other samples, whereas the compressive strength of the FA05FN15 mix including 15% of ferronickel-slag powder was approximately 11.6% lower than that of the FA20FN00 mix. The drying shrinkage of the FA20FN00 sample without ferronickel-slag powder was the highest after 56 days, whereas the FA00FN20 sample without fly ash showed the lowest shrinkage compared to the other mixes.

scholarly journals Construction Sector Contribution to Economic Stability: Malaysian GDP Distribution

2021 ◽  
Vol 13 (9) ◽  
pp. 5012
Author(s):  
Wesam Salah Alaloul ◽  
Muhammad Ali Musarat ◽  
Muhammad Babar Ali Rabbani ◽  
Qaiser Iqbal ◽  
Ahsen Maqsoom ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Construction Industry ◽  
Pearson Correlation ◽  
Impulse Response Function ◽  
Equilibrium Analysis ◽  
Construction Sector ◽  
Causality Test ◽  
Vector Error Correction ◽  
The World ◽  
Pearson Correlation Test

The construction sector exerts an exceptional impact on economic development all over the world. Adequate buildings and infrastructures made by the construction sector ensure that a country reaches certain targets like social development, industrialization, freight transportation, sustainable development, and urbanization. This study aims to determine the construction sector’s connectivity with other sectors through complex linkages that contribute immensely to the economy and gross domestic product (GDP). The data were collected from the Department of Statistics Malaysia and the World Bank from the year 1970 to 2019, and the Pearson correlation test, the cointegration test, and the Granger causality test were conducted. The vector error correction model (VECM) was created for short-term and long-term equilibrium analysis and impulse response function (IRF) was performed to study construction industry behavior. Afterwards, the forecasting was done for the year 2020 to 2050 of the Malaysian economy and GDP for the required sectors. It was revealed that some sectors, such as agriculture and services, have forward linkages while other sectors, such as manufacturing and mining, are independent of construction sector causality, which signifies the behavior of the contributing sectors when a recession occurs, hence generating significant revenue. The Malaysian economy is moving towards sustainable production with more emphasis on the construction sector. The outcome can be used as a benchmark by other countries to achieve sustainable development. The significance of this study is its usefulness for experts all over the world in terms of allocating resources to make the construction sector a sustainable sector after receiving a shock. A sustainable conceptual framework has been suggested for global application that shows the factors involved in the growth of the construction industry to ensure its sustainable development with time.

scholarly journals Towards Sustainable Development: Building’s Retrofitting with PCMs to Enhance the Indoor Thermal Comfort in Tropical Climate, Malaysia

2021 ◽  
Vol 13 (7) ◽  
pp. 3614
Author(s):  
Zeyad Amin Al-Absi ◽  
Mohd Isa Mohd Hafizal ◽  
Mazran Ismail ◽  
Azhar Ghazali
Keyword(s):  
Climate Change ◽  
Sustainable Development ◽  
Thermal Comfort ◽  
Phase Change Materials ◽  
Thermal Environment ◽  
High Energy ◽  
Transition Temperatures ◽  
Indoor Thermal Environment ◽  
Adaptive Thermal Comfort ◽  
The Difference

Building sector is associated with high energy consumption and greenhouse gas emissions, which contribute to climate change. Sustainable development emphasizes any actions to reduce climate change and its effect. In Malaysia, half of the energy utilized in buildings goes towards building cooling. Thermal comfort studies and adaptive thermal comfort models reflect the high comfort temperatures for Malaysians in naturally conditioned buildings, which make it possible to tackle the difference between buildings’ indoor temperature and the required comfort temperature by using proper passive measures. This study investigates the effectiveness of building’s retrofitting with phase change materials (PCMs) as a passive cooling technology to improve the indoor thermal environment for more comfortable conditions. PCM sheets were numerically investigated below the internal finishing of the walls. The investigation involved an optimization study for the PCMs transition temperatures and quantities. The results showed significant improvement in the indoor thermal environment, especially when using lower transition temperatures and higher quantities of PCMs. Therefore, the monthly thermal discomfort time has decreased completely, while the thermal comfort time has increased to as high as 98%. The PCM was effective year-round and the optimum performance for the investigated conditions was achieved when using 18mm layer of PCM27-26.

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