Pub Date : 2016-10-17DOI: 10.5755/J01.CT.55.2.16445
N. Galvanauskaitė, E. Griškonis, A. Sulcius
Preparation of stable manganese electrolyte with Te(VI) additive was investigated. The best Te(VI) additive was found to be orthotelluric acid H6TeO6 which does not muddle the manganese electrolyte at pH < 3.7. Orthotelluric acid was obtained from sodium tellurate Na2TeO4·2H2O solution during its acidification with concentrated sulphuric acid. The influence of Te(VI) additive on cathode polarization in manganese electrolyte was investigated. At low (0.55–2.20 mmol/l) concentrations of Te(VI) additive, electrodeposition of manganese, electrochemical and chemical Te(VI) reduction to Te(IV) and elemental Te take place on the surface of the steel cathode. The current efficiency of manganese coatings electrodeposited from acid manganese electrolyte with 2.20 mmol/l Te(VI) additive reached 35%, and the concentration of tellurium inserted in coatings was 0.85%. No manganese coating from electrolyte without Te(VI) additive was obtained.
{"title":"Mn–Te ELECTROLYTIC DEPOSITION: SEARCH OF ELECTROLYTE AND INVESTIGATION OF POLARISATION","authors":"N. Galvanauskaitė, E. Griškonis, A. Sulcius","doi":"10.5755/J01.CT.55.2.16445","DOIUrl":"https://doi.org/10.5755/J01.CT.55.2.16445","url":null,"abstract":"Preparation of stable manganese electrolyte with Te(VI) additive was investigated. The best Te(VI) additive was found to be orthotelluric acid H6TeO6 which does not muddle the manganese electrolyte at pH < 3.7. Orthotelluric acid was obtained from sodium tellurate Na2TeO4·2H2O solution during its acidification with concentrated sulphuric acid. The influence of Te(VI) additive on cathode polarization in manganese electrolyte was investigated. At low (0.55–2.20 mmol/l) concentrations of Te(VI) additive, electrodeposition of manganese, electrochemical and chemical Te(VI) reduction to Te(IV) and elemental Te take place on the surface of the steel cathode. The current efficiency of manganese coatings electrodeposited from acid manganese electrolyte with 2.20 mmol/l Te(VI) additive reached 35%, and the concentration of tellurium inserted in coatings was 0.85%. No manganese coating from electrolyte without Te(VI) additive was obtained.","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"9 1","pages":"13-17"},"PeriodicalIF":0.0,"publicationDate":"2016-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85310999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-17DOI: 10.5755/J01.CT.55.2.16454
Mindaugas Dubininkas, G. Buika, Darius Minelga
A new approach to the utilization of organic wastes discharged after biofuel production is proposed. Different amounts of glycerol-containing poly(vinyl acetate) glue samples were prepared and tested in order to examine the mechanical, rheological properties and stability to freeze / thaw cycles. Small amounts (up to 5%) of crude glycerol were found to improve freeze / thaw stability of dispersion and the elasticity of films. Samples containing up to 15% of crude glycerol fulfil D2 class requirements according to EN 204 and could be further used as a wood adhesive.
{"title":"PHYSICAL BEHAVIOUR OF WATER DISPERSION GLUE SYSTEM MODIFIED WITH ORGANIC WASTES","authors":"Mindaugas Dubininkas, G. Buika, Darius Minelga","doi":"10.5755/J01.CT.55.2.16454","DOIUrl":"https://doi.org/10.5755/J01.CT.55.2.16454","url":null,"abstract":"A new approach to the utilization of organic wastes discharged after biofuel production is proposed. Different amounts of glycerol-containing poly(vinyl acetate) glue samples were prepared and tested in order to examine the mechanical, rheological properties and stability to freeze / thaw cycles. Small amounts (up to 5%) of crude glycerol were found to improve freeze / thaw stability of dispersion and the elasticity of films. Samples containing up to 15% of crude glycerol fulfil D2 class requirements according to EN 204 and could be further used as a wood adhesive.","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"15 1","pages":"68-73"},"PeriodicalIF":0.0,"publicationDate":"2016-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90978819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-17DOI: 10.5755/j01.ct.55.2.16449
G. Navickaitė, R. Paleckienė, A. Sviklas
Molasses is a natural bioactive material from sugar industry, containing a lot of organic acids such as formic, lactic, acetic. Interaction between formic acid and urea is very important in the production fertilizers with bioactive materials. Interaction between urea and formic acid was found to occur at different ratios of the components. CO(NH 2 ) 2 ·HCOOH and CO(NH 2 ) 2 ·2HCOOH were obtained when the molar ratio was equal 1 : 1 and 1 : 2, respectively. Crystallization of CO(NH 2 ) 2 ·HCOOH lasts 15 days, but CO(NH 2 ) 2 ·2HCOOH crystallization duration is equal to 7 days. Urea solubility increased when at higher concentrations of formic acid. The various structures of urea formiates was confirmed by different instrumental methods. The urea and formic acid interaction products are stable at room temperature.
{"title":"INTERACTION OF BIOACTIVE MATERIAL FROM MOLASSES WITH UREA","authors":"G. Navickaitė, R. Paleckienė, A. Sviklas","doi":"10.5755/j01.ct.55.2.16449","DOIUrl":"https://doi.org/10.5755/j01.ct.55.2.16449","url":null,"abstract":"Molasses is a natural bioactive material from sugar industry, containing a lot of organic acids such as formic, lactic, acetic. Interaction between formic acid and urea is very important in the production fertilizers with bioactive materials. Interaction between urea and formic acid was found to occur at different ratios of the components. CO(NH 2 ) 2 ·HCOOH and CO(NH 2 ) 2 ·2HCOOH were obtained when the molar ratio was equal 1 : 1 and 1 : 2, respectively. Crystallization of CO(NH 2 ) 2 ·HCOOH lasts 15 days, but CO(NH 2 ) 2 ·2HCOOH crystallization duration is equal to 7 days. Urea solubility increased when at higher concentrations of formic acid. The various structures of urea formiates was confirmed by different instrumental methods. The urea and formic acid interaction products are stable at room temperature.","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"49 1","pages":"36-43"},"PeriodicalIF":0.0,"publicationDate":"2016-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77529338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-13DOI: 10.5755/j01.ct.56.3-4.16409
G. P. Kutas, L. Kliučininkas, D. Matuzevičius
1940 m., suskilus Technikos fakultetui į du – Statybos ir Technologijos – fakultetus, Santechnikos kabineto pagrindu Statybos fakultete 1940-08-15 įsteigta Miestų sanitarijos katedra. Statybos fakulteto taryba 1940-10-09 sios katedros vedėju paskyrė prof. S. Kairį, o santechnikos kabineto vedėju jaunesnįjį asistentą S. Vabalevicių.
{"title":"Kauno technologijos universiteto Inžinerinės ekologijos katedrai – 70 metų: nuo sanitarinės technikos iki aplinkosaugos inžinerijos","authors":"G. P. Kutas, L. Kliučininkas, D. Matuzevičius","doi":"10.5755/j01.ct.56.3-4.16409","DOIUrl":"https://doi.org/10.5755/j01.ct.56.3-4.16409","url":null,"abstract":"1940 m., suskilus Technikos fakultetui į du – Statybos ir Technologijos – fakultetus, Santechnikos kabineto pagrindu Statybos fakultete 1940-08-15 įsteigta Miestų sanitarijos katedra. Statybos fakulteto taryba 1940-10-09 sios katedros vedėju paskyrė prof. S. Kairį, o santechnikos kabineto vedėju jaunesnįjį asistentą S. Vabalevicių.","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"20 1","pages":"5-10"},"PeriodicalIF":0.0,"publicationDate":"2016-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89177945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-13DOI: 10.5755/J01.CT.56.3-4.16415
Jūlija Brovkina, G. Shulga, J. Ozoliņš
One of the most significant sectors of forest industry in Latvia is the production of wood boards, especially plywood. Latvia is the biggest producer of plywood in Eastern Europe. One of the plywood production steps is a hydrothermal treatment of birch wood. Wastewater from plywood hydrothermal pools is characterized by a high contamination level. One of the main contaminants is birch lignin which accounts for the color of water and high chemical oxygen demand (COD). Insufficient efficiency of purification from high molecular weight components requires application and development of physical-chemical methods (coagulation method). The aim of this work was to find the optimal conditions for coagulation of lignin compounds in hydrolysate of a model birch wood hydrolysis in the presence of aluminium salts. The obtained model hydrolysate imitated wastewater from the plywood hydrothermal basin. Optimal conditions of lignin compounds recovery by aluminium salts were studied by varying the dose of the coagulant and the pH of the systems, which are important technological parameters. The coagulation process was produced by mixing equal volumes of the coagulant and the model hydrolysate. The aggregation stability and coagulation of lignin compounds in the presence of aluminium salts was studied by spectrophotometry. The efficiency of coagulation in a wide range of pH and coagulant dose was determined after 2 h of settling and filtration of the system. It was established that using aluminium sulfate at the optimal dose of 230 mg/l at pH 5.0 and at a temperature of model of 22 °C, the COD reduction was 40.1%, the removal of dissolved solids 80.2%, and colour reduction about 87.3%. The optimum dose and pH for aluminium chloride were 130 mg/l and 6.0, respectively, the decrease of COD being 45.1%, the dissolved solids removal 82.1%, and colour reduction 82.7%. The experiments give the possibility to get the complete information about the efficiency of lignin compounds coagulation and to define the more optimal parameters for the purification of wastewater from hydrothermal basins in plywood industry.
{"title":"Recovery of lignin and extractive substances from the hydrolysate of model birch wood hydrolysis with aluminium","authors":"Jūlija Brovkina, G. Shulga, J. Ozoliņš","doi":"10.5755/J01.CT.56.3-4.16415","DOIUrl":"https://doi.org/10.5755/J01.CT.56.3-4.16415","url":null,"abstract":"One of the most significant sectors of forest industry in Latvia is the production of wood boards, especially plywood. Latvia is the biggest producer of plywood in Eastern Europe. One of the plywood production steps is a hydrothermal treatment of birch wood. Wastewater from plywood hydrothermal pools is characterized by a high contamination level. One of the main contaminants is birch lignin which accounts for the color of water and high chemical oxygen demand (COD). Insufficient efficiency of purification from high molecular weight components requires application and development of physical-chemical methods (coagulation method). The aim of this work was to find the optimal conditions for coagulation of lignin compounds in hydrolysate of a model birch wood hydrolysis in the presence of aluminium salts. The obtained model hydrolysate imitated wastewater from the plywood hydrothermal basin. Optimal conditions of lignin compounds recovery by aluminium salts were studied by varying the dose of the coagulant and the pH of the systems, which are important technological parameters. The coagulation process was produced by mixing equal volumes of the coagulant and the model hydrolysate. The aggregation stability and coagulation of lignin compounds in the presence of aluminium salts was studied by spectrophotometry. The efficiency of coagulation in a wide range of pH and coagulant dose was determined after 2 h of settling and filtration of the system. It was established that using aluminium sulfate at the optimal dose of 230 mg/l at pH 5.0 and at a temperature of model of 22 °C, the COD reduction was 40.1%, the removal of dissolved solids 80.2%, and colour reduction about 87.3%. The optimum dose and pH for aluminium chloride were 130 mg/l and 6.0, respectively, the decrease of COD being 45.1%, the dissolved solids removal 82.1%, and colour reduction 82.7%. The experiments give the possibility to get the complete information about the efficiency of lignin compounds coagulation and to define the more optimal parameters for the purification of wastewater from hydrothermal basins in plywood industry.","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"56 1","pages":"30-34"},"PeriodicalIF":0.0,"publicationDate":"2016-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81447064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-05DOI: 10.5755/J01.CT.67.1.16366
R. Šiaučiūnas, R. Kaminskas
This issue of ”Chemine technologija” (Chemical Technology) is actually the proceedings of the 7th Baltic Conference on Silicate Materials, hosted by the Department of Silicate Technology, Kaunas University of Technology on 26–27 May, 2016.
{"title":"The 7th Baltic Conference on Silicate Materials BaltSilica 2016","authors":"R. Šiaučiūnas, R. Kaminskas","doi":"10.5755/J01.CT.67.1.16366","DOIUrl":"https://doi.org/10.5755/J01.CT.67.1.16366","url":null,"abstract":"This issue of ”Chemine technologija” (Chemical Technology) is actually the proceedings of the 7th Baltic Conference on Silicate Materials, hosted by the Department of Silicate Technology, Kaunas University of Technology on 26–27 May, 2016.","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"7 1","pages":"6-6"},"PeriodicalIF":0.0,"publicationDate":"2016-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88715613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-05DOI: 10.5755/J01.CT.67.1.15823
D. Heinz, L. Urbonas
The aim of this study was to determine the effect of CO 2 treatment conditions and cement composition (i.e. alkali and C 3 A content, cement fineness) on the microstructure, phases and the strength of hardened cement paste and mortar. The results show that CO 2 treatment at elevated pressures produces significant changes in the microstructure of hardened cement paste. The decomposition of the hydrates and, to some extent, non-hydrated clinker minerals to form CaCO 3 phases (mainly calcite) produces a dense microstructure and increases strength significantly. The strength increased with CO 2 pressure and the duration of treatment. A further increase in strength occurred during the subsequent storage of carbonated specimens in water or in air at 20 °C and 65 %RH owing to the ongoing hydration of residual clinker minerals. Specimens treated with supercritical CO 2 and then stored at 20 °C and 65 %RH reached a 28 d compressive strength which almost doubled the standard 28 d standard strength. The use of cements with a higher fineness (strength class) reduced the carbonation rate and therefore the gain in strength, owing to the lower porosity of the initial material made with these cements. The higher alkali contents of the cement led to a slower carbonation. The largest depth of carbonation and the highest increase in strength were obtained for cements with low C 3 A and alkali contents. DOI: http://dx.doi.org/10.5755/j01.ct.67.1.15823
{"title":"Modification of cementitious building materials by treatment with CO2","authors":"D. Heinz, L. Urbonas","doi":"10.5755/J01.CT.67.1.15823","DOIUrl":"https://doi.org/10.5755/J01.CT.67.1.15823","url":null,"abstract":"The aim of this study was to determine the effect of CO 2 treatment conditions and cement composition (i.e. alkali and C 3 A content, cement fineness) on the microstructure, phases and the strength of hardened cement paste and mortar. The results show that CO 2 treatment at elevated pressures produces significant changes in the microstructure of hardened cement paste. The decomposition of the hydrates and, to some extent, non-hydrated clinker minerals to form CaCO 3 phases (mainly calcite) produces a dense microstructure and increases strength significantly. The strength increased with CO 2 pressure and the duration of treatment. A further increase in strength occurred during the subsequent storage of carbonated specimens in water or in air at 20 °C and 65 %RH owing to the ongoing hydration of residual clinker minerals. Specimens treated with supercritical CO 2 and then stored at 20 °C and 65 %RH reached a 28 d compressive strength which almost doubled the standard 28 d standard strength. The use of cements with a higher fineness (strength class) reduced the carbonation rate and therefore the gain in strength, owing to the lower porosity of the initial material made with these cements. The higher alkali contents of the cement led to a slower carbonation. The largest depth of carbonation and the highest increase in strength were obtained for cements with low C 3 A and alkali contents. DOI: http://dx.doi.org/10.5755/j01.ct.67.1.15823","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"34 1","pages":"46-52"},"PeriodicalIF":0.0,"publicationDate":"2016-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79290665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-08DOI: 10.5755/J01.CT.67.1.14896
A. Sičáková, M. Kováč, Martina Draganovska
Utilization of the construction and demolition waste (CD the a mount of water as well as the dosage of plasticizer were adjusted during mixing in order to keep the standard criteria. Next, a positive impact on the properties of hardened concrete was expected due to the effect of micro-fillers in the concrete microstructure . The results of these properties are presented and discussed in the paper, namely density, compressive strength, water absorption capacity and frost resistance. The analysis of the results is focused on the effect of an individual powdered material, on the interaction of the resulting properties of concretes, as well as on the changes of those properties in time, since the data were collected at 7, 28 and 365 days of hardening. Positive effect of fine-grain form of brick, glass and concrete on the compressive strength and partially on the frost resistance was found compared to the reference concrete, while it is not the case of water absorption capacity. DOI: http://dx.doi.org/10.5755/j01.ct.67.1.14896
{"title":"Interactions among the characteristics of concretes containing a high portion of micro-filler","authors":"A. Sičáková, M. Kováč, Martina Draganovska","doi":"10.5755/J01.CT.67.1.14896","DOIUrl":"https://doi.org/10.5755/J01.CT.67.1.14896","url":null,"abstract":"Utilization of the construction and demolition waste (CD the a mount of water as well as the dosage of plasticizer were adjusted during mixing in order to keep the standard criteria. Next, a positive impact on the properties of hardened concrete was expected due to the effect of micro-fillers in the concrete microstructure . The results of these properties are presented and discussed in the paper, namely density, compressive strength, water absorption capacity and frost resistance. The analysis of the results is focused on the effect of an individual powdered material, on the interaction of the resulting properties of concretes, as well as on the changes of those properties in time, since the data were collected at 7, 28 and 365 days of hardening. Positive effect of fine-grain form of brick, glass and concrete on the compressive strength and partially on the frost resistance was found compared to the reference concrete, while it is not the case of water absorption capacity. DOI: http://dx.doi.org/10.5755/j01.ct.67.1.14896","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"10 1","pages":"13-18"},"PeriodicalIF":0.0,"publicationDate":"2016-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84741640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-08DOI: 10.5755/J01.CT.67.1.15002
A. Eštoková, M. Smolakova, A. Luptáková, J. Strigáč
Bio-corrosion refers to the corrosion influenced by the presence of microorganisms on the surface of different concrete structures. Sulphate-reducing bacteria (SRB) and sulphur-oxidizing bacteria (SOB) belong to the best studied microorganisms causing bio-corrosion. Concrete sewer pipes, waste water collection systems and treatment plants ensure a suitable environment for the growth and activity of these microorganisms. Sulphur-oxidizing bacteria produce the biogenic sulphuric acid which may cause a significant structural damage to the sewage infrastructure by inducing the deterioration of concrete sewer pipes. This paper discusses the effects of SOB bacterial activity represented by Acidithiobacillus thiooxidans on parameters affecting the durability of cement mortar composites. Two mortar mixtures were used in the experiment: samples with a share of ground granulated blast furnace slag (65 % cement replacement) and the reference samples without any waste addition. The composites were exposed to an aggressive sulphate environment with sulphur-oxidizing bacteria for 60 days. Parameters such as the pH of liquid media and the leachability of the basic inorganic compounds from the cementitious matrix due to the aggressive environment were studied. The better durability of cement mortar samples, based on furnace slag addition, against the biogenic sulphate attack was not confirmed. DOI: http://dx.doi.org/10.5755/j01.ct.67.1.15002
{"title":"Performance of cement mortars with waste-material addition in microbiological sulphate environment","authors":"A. Eštoková, M. Smolakova, A. Luptáková, J. Strigáč","doi":"10.5755/J01.CT.67.1.15002","DOIUrl":"https://doi.org/10.5755/J01.CT.67.1.15002","url":null,"abstract":"Bio-corrosion refers to the corrosion influenced by the presence of microorganisms on the surface of different concrete structures. Sulphate-reducing bacteria (SRB) and sulphur-oxidizing bacteria (SOB) belong to the best studied microorganisms causing bio-corrosion. Concrete sewer pipes, waste water collection systems and treatment plants ensure a suitable environment for the growth and activity of these microorganisms. Sulphur-oxidizing bacteria produce the biogenic sulphuric acid which may cause a significant structural damage to the sewage infrastructure by inducing the deterioration of concrete sewer pipes. This paper discusses the effects of SOB bacterial activity represented by Acidithiobacillus thiooxidans on parameters affecting the durability of cement mortar composites. Two mortar mixtures were used in the experiment: samples with a share of ground granulated blast furnace slag (65 % cement replacement) and the reference samples without any waste addition. The composites were exposed to an aggressive sulphate environment with sulphur-oxidizing bacteria for 60 days. Parameters such as the pH of liquid media and the leachability of the basic inorganic compounds from the cementitious matrix due to the aggressive environment were studied. The better durability of cement mortar samples, based on furnace slag addition, against the biogenic sulphate attack was not confirmed. DOI: http://dx.doi.org/10.5755/j01.ct.67.1.15002","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"61 1","pages":"35-39"},"PeriodicalIF":0.0,"publicationDate":"2016-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83243133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-08DOI: 10.5755/J01.CT.67.1.14800
M. Konon, T. Antropova, T. Kostyreva, I. Drozdova, I. Polyakova
The leaching behavior of heat-treated phase-separated iron-containing sodium borosilicate glasses within the range of compositions of 8Na 2 O·(22 – х )B 2 O 3 ·70SiO 2 · х Fe 2 O 3 , where х varies from 0.3 to 10 mol.%, and (8 – x )Na 2 O∙22B 2 O 3 ∙70SiO 2 · x Fe 2 O 3 , where х varies from 2 to 6 mol.%, in the 3M aqueous HCl solution at boiling, was studied. It has been shown that the introduction of Fe 2 O 3 in these phase-separated glasses increases their chemical durability, the values of porosity and the average pore diameter, but reduces the specific surface area in the porous glasses based on them, compared with glass without Fe 2 O 3 . The compositions suitable for producing porous glasses were determined. DOI: http://dx.doi.org/10.5755/j01.ct.67.1.14800
热处理的浸出行为分离的含铁钠硼硅玻璃的成分范围内8 Na 2 O·2(22 -х)B O·70 sio 2·х菲2 O 3,х变化从0.3到10 mol. %,和(8 - x) Na 2 O∙∙22 B 2 O 70 sio 2·x菲2 O 3,х变化从2到6 mol. %, 3 m盐酸水溶液在沸腾,进行了研究。结果表明，与不含fe2o3的玻璃相比，fe2o3的引入提高了这些相分离玻璃的化学耐久性、孔隙率和平均孔径值，但降低了基于fe2o3的多孔玻璃的比表面积。确定了适于生产多孔玻璃的组合物。DOI: http://dx.doi.org/10.5755/j01.ct.67.1.14800
{"title":"Leaching of phase-separated glasses in the Na2O-B2O3-SiO2-Fe2O3 system","authors":"M. Konon, T. Antropova, T. Kostyreva, I. Drozdova, I. Polyakova","doi":"10.5755/J01.CT.67.1.14800","DOIUrl":"https://doi.org/10.5755/J01.CT.67.1.14800","url":null,"abstract":"The leaching behavior of heat-treated phase-separated iron-containing sodium borosilicate glasses within the range of compositions of 8Na 2 O·(22 – х )B 2 O 3 ·70SiO 2 · х Fe 2 O 3 , where х varies from 0.3 to 10 mol.%, and (8 – x )Na 2 O∙22B 2 O 3 ∙70SiO 2 · x Fe 2 O 3 , where х varies from 2 to 6 mol.%, in the 3M aqueous HCl solution at boiling, was studied. It has been shown that the introduction of Fe 2 O 3 in these phase-separated glasses increases their chemical durability, the values of porosity and the average pore diameter, but reduces the specific surface area in the porous glasses based on them, compared with glass without Fe 2 O 3 . The compositions suitable for producing porous glasses were determined. DOI: http://dx.doi.org/10.5755/j01.ct.67.1.14800","PeriodicalId":22505,"journal":{"name":"the Chemical Technology","volume":"71 1","pages":"7-12"},"PeriodicalIF":0.0,"publicationDate":"2016-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85209520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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