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AHEAD OF PRINT

Volume 67 (2020): Issue 4 (December 2020)

Volume 67 (2020): Issue 3 (September 2020)

Volume 67 (2020): Issue 2 (June 2020)

Volume 67 (2020): Issue 1 (March 2020)

Volume 66 (2019): Issue 4 (December 2019)

Volume 66 (2019): Issue 3 (December 2019)

Volume 66 (2019): Issue 2 (June 2019)

Volume 66 (2019): Issue 1 (March 2019)

Volume 65 (2018): Issue 4 (December 2018)

Volume 65 (2018): Issue 3 (September 2018)

Volume 65 (2018): Issue 2 (September 2018)

Volume 65 (2018): Issue 1 (March 2018)

Volume 64 (2017): Issue 4 (December 2017)

Volume 64 (2017): Issue 3 (September 2017)

Volume 64 (2017): Issue 2 (July 2017)

Volume 64 (2017): Issue 1 (March 2017)

Volume 63 (2016): Issue 4 (December 2016)

Volume 63 (2016): Issue 3 (September 2016)

Volume 63 (2016): Issue 2 (July 2016)

Volume 63 (2016): Issue 1 (May 2016)

Journal Details
Format
Journal
eISSN
1854-7400
First Published
30 Mar 2016
Publication timeframe
4 times per year
Languages
English

Search

Volume 67 (2020): Issue 1 (March 2020)

Journal Details
Format
Journal
eISSN
1854-7400
First Published
30 Mar 2016
Publication timeframe
4 times per year
Languages
English

Search

5 Articles
Open Access

In Memoriam – Assoc. Prof. Dr Ranko Todorović (30 November 1942–11 December 2019)

Published Online: 18 May 2020
Page range: 1 - 2

Abstract

Original scientific paper

Open Access

Environmental Impacts of Mixed Aggregates for use in Unbound Layers in Road Construction

Published Online: 18 May 2020
Page range: 3 - 11

Abstract

Abstract

During carbon steel manufacturing, large amounts of electric arc furnace (EAF) slag are generated. EAF slag, if properly treated and processed into aggregate, is an alternative source of high-quality material, which can substitute the use of natural aggregates in most demanding applications in the construction sector, mostly for wearing asphalt courses. In this screening process of high-quality aggregates, a side material with grain size 0/32 mm is also produced, which can be used as an aggregate for unbound layers in road construction. In this study, the environmental impacts of slag aggregate (fraction 0/32 mm) were evaluated in mixed natural/slag aggregates. Different mixtures of natural/slag aggregates were prepared from aged (28 days) and fresh slag, and their environmental impacts were evaluated using leaching tests. It was shown that among the elements, chromium (Cr) was leached from some mixed aggregates in quantities that exceeded the criterion for inert waste. The data from the present investigation revealed that mixed aggregates, prepared from aged slag (fraction 0/32 mm) and natural stone in the ratio 10/90, are environmentally acceptable and can be safely used in unbound materials for road construction.

Keywords

  • electric arc furnace slag
  • natural aggregate
  • mixed aggregates
  • environmental impacts
  • unbound materials for road construction

Ključne besede

  • žlindra iz elektroobločne peči
  • naravni agregat
  • mešani agregati
  • okoljski vplivi
  • nevezani materiali v cestogradnji
Open Access

Production and Investigation of New Cast Aluminium Alloy with Lithium Addition

Published Online: 13 Jun 2020
Page range: 13 - 19

Abstract

Abstract

Lithium additions to Al offer the promise of substantially reducing the weight of alloys, since each 1 wt. % Li added to Al reduces density by 3 % and increases elastic modulus. In the present work, the effect of 1.46 wt. % Li addition to AlSi7Mg (containing 7.05 wt. % Si and 0.35 wt. % Mg) was studied. The alloy showed reduced density and higher hardness after natural ageing. Experimental work showed that micro-structural and mechanical properties changed with Li addition. It was observed that 0.80 wt. % Li addition resulted in formation of new phase AlLiSi which has a great effect to increase hardness of AlSi7Mg. According to Scanning Electron Microscope (SEM) and X-ray diffraction analysis it was confirmed that the addition of Li causes formation of different phases which are: α-Al, β-Si and AlLiSi.

Keywords

  • aluminium
  • ageing
  • microstructural constituents
  • precipitation
  • mechanical properties

Ključne besede

  • aluminij
  • staranje
  • mikrostrukturne sestavine
  • precipitacija
  • mehanske lastnosti
Open Access

Engineering Site Investigation and Shallow Foundation Design in Ore Area of Ondo State, Nigeria

Published Online: 29 Jun 2020
Page range: 21 - 33

Abstract

Abstract

The study integrates geophysical and geotechnical methods for subsoil evaluation and shallow foundation design. The study involved six vertical electrical sounding and geotechnical investigation involving cone penetration test and laboratory soil analysis. Three major geologic units were delineated; the topsoil, weathered layer and partly weathered/fractured/fresh bedrock. The overburden thickness is in between 15.2–32.9 m. Based on resistivity (16–890 ohm-m) and thickness (12.7–32 m) the weathered layer is competent to distribute structural load to underlying soil/rock. The groundwater level varies from 4.5 to 12.3 m. Therefore an average allowable bearing capacity of 200 kPa is recommended and would be appropriate for design of shallow foundation in the area, at a depth not less than 1.0 m with an expected settlement ranging from 9.03–48.20 mm. The ultimate bearing and allowable bearing capacity for depth levels of 1–3 m vary from 1403–2666 kPa and 468–889 kPa for strip footing while square footing varies in between 1956–3489 kPa and 652–1163 kPa respectively.

Keywords

  • cone penetration test
  • vertical electrical sounding
  • settlement analysis
  • bearing capacity
  • Ore southwestern

Ključne besede

  • preizkus s statičnim konusnim penetrometrom
  • navpično električno sondiranje
  • analiza posedkov
  • nosilnost tal
  • JZ Ore
Open Access

The Deposition Temperature Dependence on the Crystallite Size of NiO Thin Films

Published Online: 15 Jun 2020
Page range: 35 - 38

Abstract

Abstract

In this article, we have investigated a fitting proposal model for calculating the crystallite size of pure NiO thin films by varying the structural parameters, such as full width at half-maximum β, lattice parameter a and differences in aa0. The experimental data of NiO thin films were prepared at several deposition temperatures in the range of 380–460°C. All estimated values of crystallite sizes are proportional to the experimental data. Thus, the measurement of the crystallite size values by this proposed model is compatible with practical measurements qualitative.

Keywords

  • NiO thin films
  • deposition temperature
  • crystallite size
  • defect structure
  • fitting

Ključne besede

  • tanke plasti NiO
  • temperatura nanosa
  • velikost kristalnega zrna
  • strukturne napake
  • ujemanje
5 Articles
Open Access

In Memoriam – Assoc. Prof. Dr Ranko Todorović (30 November 1942–11 December 2019)

Published Online: 18 May 2020
Page range: 1 - 2

Abstract

Original scientific paper

Open Access

Environmental Impacts of Mixed Aggregates for use in Unbound Layers in Road Construction

Published Online: 18 May 2020
Page range: 3 - 11

Abstract

Abstract

During carbon steel manufacturing, large amounts of electric arc furnace (EAF) slag are generated. EAF slag, if properly treated and processed into aggregate, is an alternative source of high-quality material, which can substitute the use of natural aggregates in most demanding applications in the construction sector, mostly for wearing asphalt courses. In this screening process of high-quality aggregates, a side material with grain size 0/32 mm is also produced, which can be used as an aggregate for unbound layers in road construction. In this study, the environmental impacts of slag aggregate (fraction 0/32 mm) were evaluated in mixed natural/slag aggregates. Different mixtures of natural/slag aggregates were prepared from aged (28 days) and fresh slag, and their environmental impacts were evaluated using leaching tests. It was shown that among the elements, chromium (Cr) was leached from some mixed aggregates in quantities that exceeded the criterion for inert waste. The data from the present investigation revealed that mixed aggregates, prepared from aged slag (fraction 0/32 mm) and natural stone in the ratio 10/90, are environmentally acceptable and can be safely used in unbound materials for road construction.

Keywords

  • electric arc furnace slag
  • natural aggregate
  • mixed aggregates
  • environmental impacts
  • unbound materials for road construction

Ključne besede

  • žlindra iz elektroobločne peči
  • naravni agregat
  • mešani agregati
  • okoljski vplivi
  • nevezani materiali v cestogradnji
Open Access

Production and Investigation of New Cast Aluminium Alloy with Lithium Addition

Published Online: 13 Jun 2020
Page range: 13 - 19

Abstract

Abstract

Lithium additions to Al offer the promise of substantially reducing the weight of alloys, since each 1 wt. % Li added to Al reduces density by 3 % and increases elastic modulus. In the present work, the effect of 1.46 wt. % Li addition to AlSi7Mg (containing 7.05 wt. % Si and 0.35 wt. % Mg) was studied. The alloy showed reduced density and higher hardness after natural ageing. Experimental work showed that micro-structural and mechanical properties changed with Li addition. It was observed that 0.80 wt. % Li addition resulted in formation of new phase AlLiSi which has a great effect to increase hardness of AlSi7Mg. According to Scanning Electron Microscope (SEM) and X-ray diffraction analysis it was confirmed that the addition of Li causes formation of different phases which are: α-Al, β-Si and AlLiSi.

Keywords

  • aluminium
  • ageing
  • microstructural constituents
  • precipitation
  • mechanical properties

Ključne besede

  • aluminij
  • staranje
  • mikrostrukturne sestavine
  • precipitacija
  • mehanske lastnosti
Open Access

Engineering Site Investigation and Shallow Foundation Design in Ore Area of Ondo State, Nigeria

Published Online: 29 Jun 2020
Page range: 21 - 33

Abstract

Abstract

The study integrates geophysical and geotechnical methods for subsoil evaluation and shallow foundation design. The study involved six vertical electrical sounding and geotechnical investigation involving cone penetration test and laboratory soil analysis. Three major geologic units were delineated; the topsoil, weathered layer and partly weathered/fractured/fresh bedrock. The overburden thickness is in between 15.2–32.9 m. Based on resistivity (16–890 ohm-m) and thickness (12.7–32 m) the weathered layer is competent to distribute structural load to underlying soil/rock. The groundwater level varies from 4.5 to 12.3 m. Therefore an average allowable bearing capacity of 200 kPa is recommended and would be appropriate for design of shallow foundation in the area, at a depth not less than 1.0 m with an expected settlement ranging from 9.03–48.20 mm. The ultimate bearing and allowable bearing capacity for depth levels of 1–3 m vary from 1403–2666 kPa and 468–889 kPa for strip footing while square footing varies in between 1956–3489 kPa and 652–1163 kPa respectively.

Keywords

  • cone penetration test
  • vertical electrical sounding
  • settlement analysis
  • bearing capacity
  • Ore southwestern

Ključne besede

  • preizkus s statičnim konusnim penetrometrom
  • navpično električno sondiranje
  • analiza posedkov
  • nosilnost tal
  • JZ Ore
Open Access

The Deposition Temperature Dependence on the Crystallite Size of NiO Thin Films

Published Online: 15 Jun 2020
Page range: 35 - 38

Abstract

Abstract

In this article, we have investigated a fitting proposal model for calculating the crystallite size of pure NiO thin films by varying the structural parameters, such as full width at half-maximum β, lattice parameter a and differences in aa0. The experimental data of NiO thin films were prepared at several deposition temperatures in the range of 380–460°C. All estimated values of crystallite sizes are proportional to the experimental data. Thus, the measurement of the crystallite size values by this proposed model is compatible with practical measurements qualitative.

Keywords

  • NiO thin films
  • deposition temperature
  • crystallite size
  • defect structure
  • fitting

Ključne besede

  • tanke plasti NiO
  • temperatura nanosa
  • velikost kristalnega zrna
  • strukturne napake
  • ujemanje

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