Measuring, Monitoring and Modeling Concrete Properties, 2006
In this work criteria and methodology are proposed for the diagnosis of the durability of steel r... more In this work criteria and methodology are proposed for the diagnosis of the durability of steel reinforcement’s in restored monuments. An integrated methodology is applied for the assessment, of traditional buildings from several areas of Greece, such as Rhodes (Kallithea Spa), Chios (Nea Moni Monastery) and Symi (The Bell Tower of St. John Prodromos). Non-destructive techniques were applied in situ
The addition of industrial by-products such as fly ash, blast furnace slag and silica fume in cem... more The addition of industrial by-products such as fly ash, blast furnace slag and silica fume in cement and concrete is an entrenched procedure that improves the resistance of concrete to various chemical attacks and therefore its long-term durability. Cement Kiln Dust (CKD) has been used in previous studies as filler in cement and concrete. The proportions of CKD and pozzolanic materials used in these studies did not provide any additional protection against corrosion as was initially expected. The aim of this research is the examination of the performance of CKD together with Blast Furnace Slag (BFS) and corrosion inhibitors as additives and the determination of their optimum proportions. Electrochemical and mass loss measurements were performed in order to evaluate the performance of mortar specimens with various proportions of additives and embedded steel bars when exposed in the corrosive environment of 3.5% wt. NaCl solution. Results indicated that the combined use of CKD with BFS in mortar specimens led to lower corrosion rates than the reference ones and the addition of the corrosion inhibitor further improved the anticorrosive performance of the composite cements.
Measuring, Monitoring and Modeling Concrete Properties, 2006
In this work criteria and methodology are proposed for the diagnosis of the durability of steel r... more In this work criteria and methodology are proposed for the diagnosis of the durability of steel reinforcement’s in restored monuments. An integrated methodology is applied for the assessment, of traditional buildings from several areas of Greece, such as Rhodes (Kallithea Spa), Chios (Nea Moni Monastery) and Symi (The Bell Tower of St. John Prodromos). Non-destructive techniques were applied in situ
Measuring, Monitoring and Modeling Concrete Properties, 2006
... steel have been evaluated by electrochemical measurements and compared with that obtained fro... more ... steel have been evaluated by electrochemical measurements and compared with that obtained from metal loss determination. ... According to the guidelines involved in ASTM C 876, the probability of corrosion initiation is greater than 90 ... Organic corrosion inhibitor effectiveness ...
ABSTRACT The use of coatings (organic and inorganic) for the protection of reinforced concrete is... more ABSTRACT The use of coatings (organic and inorganic) for the protection of reinforced concrete is widespread. The advantages of inorganic coatings are that they are stable in UV-radiation, non-combustible, do not foul and have a microcrystalline texture, while organic coatings have the advantage of low permeability of carbon dioxide, sulphur dioxide and water. The aim of the present work was to compare, in the presence of chloride ions, the performance of an acrylic dispersion and a silicate coating, when the latter was or was not combined with a corrosion inhibitor (N-N’-dimethylaminoethanol). The behaviour of the silicate coating was examined as its use is increasing due to environmental reasons and as it can be applied for the rehabilitation of old structures. Half-cell potential measurements, mass loss and carbonation depth measurements, as well as chloride diffusion rate revealed that the acrylic dispersion provides better protection of reinforcing steel in concrete than the silicate coating, but the combination of the silicate coating with the corrosion inhibitor provides the best level of concrete protection.
ABSTRACT The purpose of this work was to investigate the possibilities for the exploitation of th... more ABSTRACT The purpose of this work was to investigate the possibilities for the exploitation of the powder by-product of oxygen convertor slag from the ferronickel industry as pigment in anticorrosive non-toxic paints. The chemical composition of the powder shows a large content of Fe3O4 and a high value of pH, two features favouring its use in anticorrosive paints. Paints with this powder, either unrefined or processed, as a pigment and chlorinated rubber resin were produced and tested by the following methods: half-cell potential, mass loss, chloride diffusion and EIS. The results indicated that protection of steel was achieved to a satisfactory level, especially with the processed material.
ABSTRACT The objective of this paper is to investigate the possibility of introducing a natural p... more ABSTRACT The objective of this paper is to investigate the possibility of introducing a natural pozzolan named porfiritis, a natural waste product from the gold mines located in N.E. Chalkidiki Greece, as a supplementary cementing material. Blended cement was produced by replacing PC with 20% w/w porfiritis for the evaluation of the pozzolanic cement properties. Reinforced mortar specimens were either partially immersed in 3.5% w/w NaCl solution or exposed to atmospheric conditions, for a period of 6 months. The experimental methods used were: corrosion potential, corrosion rate by the Linear Polarization method, mass loss, carbonation depth and compressive strength. Based on the results of this study, it is concluded that the use of the porfiritic deposit as a blended cement constituent improves the corrosion behaviour of the mortar specimens, while no serious detrimental effect on the mechanical behaviour of the concrete is detected. Keywords: porfiritis, pozzolanic cements, chlorides corrosion, carbonation. 1 Introduction The blended cement industry is a relatively new and rapidly growing field. The literature on blended cements is extensive, as measurements at laboratory and pilot-plant scale have been carried out over a period of about 50 years. Blended cements provide specific technical advantages in comparison with ordinary Portland cement, with regard to durability in various corrosion environments. One of the most common materials classified as cementitious is natural pozzolans, natural material containing silica in a reactive form [1–3].
Measuring, Monitoring and Modeling Concrete Properties, 2006
In this work the cases of Archaeological Museums of Rethimnon and Herakleion are examined. Corros... more In this work the cases of Archaeological Museums of Rethimnon and Herakleion are examined. Corrosion examination has been succeeded with non destructive techniques such as Fiber Optics Microscopy (FOM), Infra Red Thermography (IR - Th), Ultrasound Velocity (US), Determination of Reinforce Corrosion Potential, Concrete Specific Electrical Resistance and Concrete Carbonation Depth. Destructive techniques were also applied in lab such as
... X. BALEC, V, MURAT, M, The emanation thermal analysis of kaolinite clay minerals, Thermochimi... more ... X. BALEC, V, MURAT, M, The emanation thermal analysis of kaolinite clay minerals, Thermochimica Acta, 282, 1996, pp 385-397. ... 19. GALLIAS, JL, KARA-ALI, R, BIGAS, JP, The effect of fine mineral admixtures on water requirement of cement pastes, Cement and Concrete ...
Measuring, Monitoring and Modeling Concrete Properties, 2006
In this work criteria and methodology are proposed for the diagnosis of the durability of steel r... more In this work criteria and methodology are proposed for the diagnosis of the durability of steel reinforcement’s in restored monuments. An integrated methodology is applied for the assessment, of traditional buildings from several areas of Greece, such as Rhodes (Kallithea Spa), Chios (Nea Moni Monastery) and Symi (The Bell Tower of St. John Prodromos). Non-destructive techniques were applied in situ
The addition of industrial by-products such as fly ash, blast furnace slag and silica fume in cem... more The addition of industrial by-products such as fly ash, blast furnace slag and silica fume in cement and concrete is an entrenched procedure that improves the resistance of concrete to various chemical attacks and therefore its long-term durability. Cement Kiln Dust (CKD) has been used in previous studies as filler in cement and concrete. The proportions of CKD and pozzolanic materials used in these studies did not provide any additional protection against corrosion as was initially expected. The aim of this research is the examination of the performance of CKD together with Blast Furnace Slag (BFS) and corrosion inhibitors as additives and the determination of their optimum proportions. Electrochemical and mass loss measurements were performed in order to evaluate the performance of mortar specimens with various proportions of additives and embedded steel bars when exposed in the corrosive environment of 3.5% wt. NaCl solution. Results indicated that the combined use of CKD with BFS in mortar specimens led to lower corrosion rates than the reference ones and the addition of the corrosion inhibitor further improved the anticorrosive performance of the composite cements.
Measuring, Monitoring and Modeling Concrete Properties, 2006
In this work criteria and methodology are proposed for the diagnosis of the durability of steel r... more In this work criteria and methodology are proposed for the diagnosis of the durability of steel reinforcement’s in restored monuments. An integrated methodology is applied for the assessment, of traditional buildings from several areas of Greece, such as Rhodes (Kallithea Spa), Chios (Nea Moni Monastery) and Symi (The Bell Tower of St. John Prodromos). Non-destructive techniques were applied in situ
Measuring, Monitoring and Modeling Concrete Properties, 2006
... steel have been evaluated by electrochemical measurements and compared with that obtained fro... more ... steel have been evaluated by electrochemical measurements and compared with that obtained from metal loss determination. ... According to the guidelines involved in ASTM C 876, the probability of corrosion initiation is greater than 90 ... Organic corrosion inhibitor effectiveness ...
ABSTRACT The use of coatings (organic and inorganic) for the protection of reinforced concrete is... more ABSTRACT The use of coatings (organic and inorganic) for the protection of reinforced concrete is widespread. The advantages of inorganic coatings are that they are stable in UV-radiation, non-combustible, do not foul and have a microcrystalline texture, while organic coatings have the advantage of low permeability of carbon dioxide, sulphur dioxide and water. The aim of the present work was to compare, in the presence of chloride ions, the performance of an acrylic dispersion and a silicate coating, when the latter was or was not combined with a corrosion inhibitor (N-N’-dimethylaminoethanol). The behaviour of the silicate coating was examined as its use is increasing due to environmental reasons and as it can be applied for the rehabilitation of old structures. Half-cell potential measurements, mass loss and carbonation depth measurements, as well as chloride diffusion rate revealed that the acrylic dispersion provides better protection of reinforcing steel in concrete than the silicate coating, but the combination of the silicate coating with the corrosion inhibitor provides the best level of concrete protection.
ABSTRACT The purpose of this work was to investigate the possibilities for the exploitation of th... more ABSTRACT The purpose of this work was to investigate the possibilities for the exploitation of the powder by-product of oxygen convertor slag from the ferronickel industry as pigment in anticorrosive non-toxic paints. The chemical composition of the powder shows a large content of Fe3O4 and a high value of pH, two features favouring its use in anticorrosive paints. Paints with this powder, either unrefined or processed, as a pigment and chlorinated rubber resin were produced and tested by the following methods: half-cell potential, mass loss, chloride diffusion and EIS. The results indicated that protection of steel was achieved to a satisfactory level, especially with the processed material.
ABSTRACT The objective of this paper is to investigate the possibility of introducing a natural p... more ABSTRACT The objective of this paper is to investigate the possibility of introducing a natural pozzolan named porfiritis, a natural waste product from the gold mines located in N.E. Chalkidiki Greece, as a supplementary cementing material. Blended cement was produced by replacing PC with 20% w/w porfiritis for the evaluation of the pozzolanic cement properties. Reinforced mortar specimens were either partially immersed in 3.5% w/w NaCl solution or exposed to atmospheric conditions, for a period of 6 months. The experimental methods used were: corrosion potential, corrosion rate by the Linear Polarization method, mass loss, carbonation depth and compressive strength. Based on the results of this study, it is concluded that the use of the porfiritic deposit as a blended cement constituent improves the corrosion behaviour of the mortar specimens, while no serious detrimental effect on the mechanical behaviour of the concrete is detected. Keywords: porfiritis, pozzolanic cements, chlorides corrosion, carbonation. 1 Introduction The blended cement industry is a relatively new and rapidly growing field. The literature on blended cements is extensive, as measurements at laboratory and pilot-plant scale have been carried out over a period of about 50 years. Blended cements provide specific technical advantages in comparison with ordinary Portland cement, with regard to durability in various corrosion environments. One of the most common materials classified as cementitious is natural pozzolans, natural material containing silica in a reactive form [1–3].
Measuring, Monitoring and Modeling Concrete Properties, 2006
In this work the cases of Archaeological Museums of Rethimnon and Herakleion are examined. Corros... more In this work the cases of Archaeological Museums of Rethimnon and Herakleion are examined. Corrosion examination has been succeeded with non destructive techniques such as Fiber Optics Microscopy (FOM), Infra Red Thermography (IR - Th), Ultrasound Velocity (US), Determination of Reinforce Corrosion Potential, Concrete Specific Electrical Resistance and Concrete Carbonation Depth. Destructive techniques were also applied in lab such as
... X. BALEC, V, MURAT, M, The emanation thermal analysis of kaolinite clay minerals, Thermochimi... more ... X. BALEC, V, MURAT, M, The emanation thermal analysis of kaolinite clay minerals, Thermochimica Acta, 282, 1996, pp 385-397. ... 19. GALLIAS, JL, KARA-ALI, R, BIGAS, JP, The effect of fine mineral admixtures on water requirement of cement pastes, Cement and Concrete ...
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