Martin Mengede - Academia.edu (original) (raw)

Papers by Martin Mengede

Research paper thumbnail of Efficacy of lime, hydrogen peroxide and azamethiphos as potential control treatments against the proliferation of the invasive ascidian Didemnum vexillum

Management of Biological Invasions, 2024

Research paper thumbnail of Optimizing the use of quicklime (CaO) for sea urchin management — A lab and field study

Ecological Engineering, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Transformation Kinetics of Burnt Lime in Freshwater and Sea Water

Materials, Nov 2, 2020

Calcium oxide (CaO), also known as burnt lime, is being considered as a possible treatment to red... more Calcium oxide (CaO), also known as burnt lime, is being considered as a possible treatment to reduce the negative impact of sea urchins on tare forests in northern coastal waters and blue-green algal blooms in the surrounding of fish-farms. In this respect, the reaction kinetics of burnt lime in contact with sea water has been elucidated and compared to its behaviour in fresh water. In the first minutes of contact between burnt lime and water, it "slaked" as CaO reacted with water to yield calcium hydroxide (Ca(OH) 2). Subsequently, calcium hydroxide reacted with magnesium, sulphate and carbonate from the sea water to yield magnesium hydroxide (Mg(OH) 2), calcium sulphate dihydrate (gypsum, CaSO 4 •2H 2 O) and calcium carbonate (CaCO 3), respectively. In a closed system of 1% CaO in natural sea water (where the supply of sulphate, magnesium and carbonate is limited), more than 90% reacted within the first 5 h. It is foreseen that in an open system, like a marine fjord, it will react even faster. The pH 8 of sea water close to the CaO particle surface will immediately increase to a theoretical value of about 12.5 but will, in an open system with large excess of sea water, rapidly fall back to pH 10.5 being equilibrium pH of magnesium hydroxide. This is further reduced to <9 due to the common ion effect of dissolved magnesium in sea water and then be diluted to the sea water background pH, about 8. Field test dosing CaO particles to sea water showed that the pH of water between the particles stayed around 8.

Research paper thumbnail of Lime-cement stabilisation of Trondheim clays and its impact on carbon dioxide emissions

Research paper thumbnail of Optimizing the use of quicklime (CaO) for sea urchin management — A lab and field study

Ecological Engineering, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Effects of fillers on the rheological/mechanical performance of mastics/asphalt mixes

This paper summarises the effects of four different fillers on the rheological properties of mast... more This paper summarises the effects of four different fillers on the rheological properties of mastics and mechanical properties of asphalt mixtures produced with these four different types of added fillers. The main aim of the study is to evaluate rheological properties of the mastic that control the asphalt performance (i.e. rutting, fatigue cracking and thermal cracking). The second objective of the study is to evaluate some of the mechanical properties of the asphalt mixtures produced with the studied fillers as well as the optimum bitumen content for a certain aggregates, grading curve and filler content. Therefore, in addition to a preliminary characterization of the fillers based on the evaluation of the Specific Surface Area (SSA) and Rigden voids, the study is divided in two main sections. Firstly four different mastics have been prepared in order to conduct Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) tests and therefore obtain information about the rheolog...

Research paper thumbnail of Determining the risk of calcium oxide (CaO) particle exposure to marine organisms

Marine Environmental Research

Research paper thumbnail of Transformation Kinetics of Burnt Lime in Freshwater and Sea Water

The reaction kinetics of burnt lime (CaO) in contact with sea water has been elucidated and compa... more The reaction kinetics of burnt lime (CaO) in contact with sea water has been elucidated and compared to its behaviour in fresh water. In the first minutes of contact between burnt lime and water, it "slaked" as CaO reacted with water to yield calcium hydroxide (Ca(OH)2). Subsequently, calcium hydroxide reacted with magnesium, sulphate and carbonate from the sea water to yield magnesium hydroxide (Mg(OH)2), calcium sulphate dihydrate (gypsum, CaSO4·2H2O) and calcium carbonate (CaCO3), respectively. In a closed system of 1% CaO in natural sea water (where the supply of sulphate, magnesium and carbonate is limited), more than 90% reacted within the first 5 hours. It is foreseen that in an open system, like a marine fjord, it will react even faster. The pH 8 of sea water close to the CaO particle surface will immediately increase to a theoretical value of about 12.5 but will, in an open system with large excess of sea water, rapidly fall back to pH 10.5 being equilibrium pH of...

Research paper thumbnail of Efficacy of lime, hydrogen peroxide and azamethiphos as potential control treatments against the proliferation of the invasive ascidian Didemnum vexillum

Management of Biological Invasions, 2024

Research paper thumbnail of Optimizing the use of quicklime (CaO) for sea urchin management — A lab and field study

Ecological Engineering, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Transformation Kinetics of Burnt Lime in Freshwater and Sea Water

Materials, Nov 2, 2020

Calcium oxide (CaO), also known as burnt lime, is being considered as a possible treatment to red... more Calcium oxide (CaO), also known as burnt lime, is being considered as a possible treatment to reduce the negative impact of sea urchins on tare forests in northern coastal waters and blue-green algal blooms in the surrounding of fish-farms. In this respect, the reaction kinetics of burnt lime in contact with sea water has been elucidated and compared to its behaviour in fresh water. In the first minutes of contact between burnt lime and water, it "slaked" as CaO reacted with water to yield calcium hydroxide (Ca(OH) 2). Subsequently, calcium hydroxide reacted with magnesium, sulphate and carbonate from the sea water to yield magnesium hydroxide (Mg(OH) 2), calcium sulphate dihydrate (gypsum, CaSO 4 •2H 2 O) and calcium carbonate (CaCO 3), respectively. In a closed system of 1% CaO in natural sea water (where the supply of sulphate, magnesium and carbonate is limited), more than 90% reacted within the first 5 h. It is foreseen that in an open system, like a marine fjord, it will react even faster. The pH 8 of sea water close to the CaO particle surface will immediately increase to a theoretical value of about 12.5 but will, in an open system with large excess of sea water, rapidly fall back to pH 10.5 being equilibrium pH of magnesium hydroxide. This is further reduced to <9 due to the common ion effect of dissolved magnesium in sea water and then be diluted to the sea water background pH, about 8. Field test dosing CaO particles to sea water showed that the pH of water between the particles stayed around 8.

Research paper thumbnail of Lime-cement stabilisation of Trondheim clays and its impact on carbon dioxide emissions

Research paper thumbnail of Optimizing the use of quicklime (CaO) for sea urchin management — A lab and field study

Ecological Engineering, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Effects of fillers on the rheological/mechanical performance of mastics/asphalt mixes

This paper summarises the effects of four different fillers on the rheological properties of mast... more This paper summarises the effects of four different fillers on the rheological properties of mastics and mechanical properties of asphalt mixtures produced with these four different types of added fillers. The main aim of the study is to evaluate rheological properties of the mastic that control the asphalt performance (i.e. rutting, fatigue cracking and thermal cracking). The second objective of the study is to evaluate some of the mechanical properties of the asphalt mixtures produced with the studied fillers as well as the optimum bitumen content for a certain aggregates, grading curve and filler content. Therefore, in addition to a preliminary characterization of the fillers based on the evaluation of the Specific Surface Area (SSA) and Rigden voids, the study is divided in two main sections. Firstly four different mastics have been prepared in order to conduct Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) tests and therefore obtain information about the rheolog...

Research paper thumbnail of Determining the risk of calcium oxide (CaO) particle exposure to marine organisms

Marine Environmental Research

Research paper thumbnail of Transformation Kinetics of Burnt Lime in Freshwater and Sea Water

The reaction kinetics of burnt lime (CaO) in contact with sea water has been elucidated and compa... more The reaction kinetics of burnt lime (CaO) in contact with sea water has been elucidated and compared to its behaviour in fresh water. In the first minutes of contact between burnt lime and water, it "slaked" as CaO reacted with water to yield calcium hydroxide (Ca(OH)2). Subsequently, calcium hydroxide reacted with magnesium, sulphate and carbonate from the sea water to yield magnesium hydroxide (Mg(OH)2), calcium sulphate dihydrate (gypsum, CaSO4·2H2O) and calcium carbonate (CaCO3), respectively. In a closed system of 1% CaO in natural sea water (where the supply of sulphate, magnesium and carbonate is limited), more than 90% reacted within the first 5 hours. It is foreseen that in an open system, like a marine fjord, it will react even faster. The pH 8 of sea water close to the CaO particle surface will immediately increase to a theoretical value of about 12.5 but will, in an open system with large excess of sea water, rapidly fall back to pH 10.5 being equilibrium pH of...