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- MakaleAçık Erişim2019Some Physical and Mechanical Properties of Impregnated Chestnut Wood with Natural and Chemical Agent Exposed to Outdoor Conditions
Yasar, Mehmet; Altunoiv, Mustafa
Wood preservatives have been widely used to extend the service life of wood. The most objectionable environment for wood is outdoor conditions. In this study, test specimens prepared from chestnut wood (Castanea sativa Mill) were impregnated with natural and chemical impregnation agent. It was aimed to determine the effect of outdoor conditions on physical and mechanical properties of wood material by keeping them under these conditions for one year. As natural impregnation material pine tannin and acorn tannins, as chemical impregnation material imersol aqua and timbercare aqua were used. The retention amount, air-dried density, bending strength, modulus of elasticity, compression strength parallel to fibers, adhesion strength parallel to fibers, screw withdrawal strength were determined. As a result, it can be said that the physical and mechanical test values can compare wood impregnated with natural impregnation materials to wood impregnated with chemical impregnation materials after one year exposed to outdoor conditions.
AtıfWoS5OpenAlex4TR Dizin4İncele - Yüksek Lisans TeziAçık Erişim2018Polen, propolis ve nohut ilavesiyle üretilen organik kestane balı sirkelerinin fiziksel, kimyasal ve biyoaktif bileşenlerinin tespiti
Havva Nur Kobya
Bu çalışma, Organik kestane balına farklı oranlarda ekmek mayası, propolis, polen, elma sirkesi, nohut ilave edilerek yüzey kültür yöntemi ile üretilen 11 çeşit bal sirkesinin bazı fiziksel, kimyasal ve biyoaktif özelliklerinin belirlenmesi ve standartlara uygunluğunun belirlenmesi amacıyla yapılmıştır. Ayrıca biyoaktif özellikler açısından da elma ve üzüm sirkeleri ile karşılaştırılmıştır. Bu amaçla 110 g organik kestane balı içeren kavanozların briksi su ile % 15 olacak şekilde toplam 11 adet örnek hazırlanmıştır. Polen ve propolis örneklere başlangıçta ve sonradan (etil alkol fermantasyonu tamamlandıktan sonra) olmak üzere iki şekilde ilave edilmiştir. Örnekler S1 ( sade kestane balı) S2 (15 g propolis ), S3 (15 gr polen), S4 (10 gr ekmek mayası), S5 ( 110 mL elma sirkesi), S6 ( 15 g nohut ve polen), S7 ( 15 g nohut ve propolis), S8 ( 15 g nohut ve sonradan polen), S9 ( 15 g nohut ve sonradan propolis ), S10 ( 15 g sonradan polen ), S11 (15 g sonradan propolis) organik bal sirkesi üretmek üzere hazırlandı. Hazırlanan tüm numuneler 28-30 °C 'de etüve konulularak onbeş günde bir asitlik artışı takip edildi. Beklenen asitlik değerine ulaşılmasına yakın alkol analizi yapılarak % 0.50 altında alkol kaldığında fermantasyon bitirildi. Sirkeleşme 4-14 haftada tamamlandı ve analiz yapılıncaya kadar buzdolabında 4°C'de saklandı. Örneklerde fiziksel (renk), kimyasal (kül, alkol, pH, toplam asit, şeker, uçar ve uçar olmayan asit, kurumadde, iyot sayısı, oksidasyon sayısı, serbest mineral asit, ester) ve biyoaktif özellik olarakta antioksidan ve toplam fenolik madde miktarına bakılmıştır. Elde edilen sonuçlara göre, örneklerin renk değerleri L* 21.70-33.96, a* 3.63-10.21 ve b* 0.80-9.28 olarak ölçülmüştür. Toplam asitlik değerleri asetik asit cinsinden 4.09±0.03-4.55±0.07 g/L, kül 0.05±0.08-0.89±0.03 g/mL, alkol 0.06±0.00-0.34±0.13g/mL ve pH değerleri ise 2.35±0.01-3.41±0.09 arasında belirlenmiştir. Biyoaktif özellik olarak ise bal sirkelerinde; antioksidan kapasite 61.65±1.28-305.93±6.18 mg AAE/L ve toplam fenolik madde içeriği 43.78±1.68-182.86±0.01 mg GAE /L olarak bulunmuştur. Üretilen sirke örneklerinde toplam asit miktarı en fazla elma sirkeli kestane balı sirkesinde (S5), antioksidan değeri ise en fazla sonradan polen ilave edilen kestane balı sirkesinde ( S10) bulunmuştur. Antioksidan bakımından üzüm (55.11±0.27) ve elma (48.12±0.39) sirkeleri ile karşılaştırıldığında en yüksek değer sonradan polenli kestane balı sirkesinde (S10) bulunmuştur. Sonuç olarak üretilen tüm örneklerin sirkelerde önemli bir kalite kriteri olan asitlk açısından Türk Gıda Kodeksi mevzuatına uygun olduğu, fenolik madde içeriği zengin ve yüksek antioksidan kapasiteye sahip olduğu tespit edilmiştir.
- MakaleAçık Erişim2016Scopus SJRQ2Combustion Characteristics of Impregnated and Surface-treated Chestnut (Castanea sativa Mill.) Wood Left Outdoors for One Year
Fidan, Muhammed Said; Yaşar, Şekip Şadiye; Yaşar, Mehmet; Atar, Musa; Alkan, Elif
Treating wood with impregnating materials in order to improve resistance to burning is a commonly employed safety measure. In this study, chestnut (Castanea sativa Mill.) wood samples were impregnated using either Tanalith-E or Wolmanit-CB according to ASTM-D 1413-76 and surface-treated using water-based or synthetic varnish according to ASTM-D 3023. These samples were used to investigate the combustion characteristics of samples left outdoors for one year as detailed in ASTM-E 160-50. The combustion temperatures of the samples left outdoors were similar upon impregnation with either Tanalith-E or Wolmanit-CB. However, the combustion temperature of the samples treated with synthetic varnish was lower than those that were treated with water-based varnish. The time to collapse and the total duration of combustion of the samples left outdoors were shorter for those impregnated with Wolmanit-CB. Weight loss of the samples left outdoors was higher for those that were impregnated with Tanalith-E and treated with water-based varnish. Gas analysis of the samples that were left outdoors indicated that the O2 content of flue gas from samples that were impregnated with Wolmanit-CB and treated with synthetic varnish was high and the CO content of flue gas from the same samples was low.
AtıfScopus5WoS4OpenAlex8İncele - MakaleYalnız künye2016Scopus SJRQ2Influences of seasonal alterations on the burning characteristics of impregnated and surface treated chestnut (Castanea sativa mill ) wood
Yasar, S. Sadiye; Fidan, Muhammed Said; Yasar, Mehmet; Atar, Musa; Alkan, Elif
Wood material is generally preferred due to its resilience against earthquakes, aesthetic properties, and its warmth as well as being natural. One of the major problems of employing this natural and breathable product is its ease of combustibility. Despite this adverse characteristic, its high resistance against burning and its ability to maintain its weight bearing characteristics until the very end does not lead to sudden collapses as is seen in steel and concrete systems. Treating wood with impregnating materials in order to improve its resistance against burning is an improved safety measure for the prevention of ignition. This study investigate seasonal effects on the ignition characteristics of chestnut wood samples impregnated using either Tanalith-E or Wolmanit-CB as detailed in ASTM-D 1413-76 and surface-treated using water-based or synthetic varnish as detailed in ASTM-D 3023- 88. The temperature of burning process was the highest in the investigated samples, in those impregnated with Wolmanit-CB and those that were treated with water-based varnish. The results of the study indicated that weight loss was lower during winter (84.59 %), for samples that were impregnated using Wolmanit-CB (84.46 %) and in those that were treated with water-based varnish (84.18 %). On the other hand, the O2 content was determined to be the highest and the CO content the lowest in winter samples that were impregnated using Wolmanit-CB and treated with synthetic varnish.
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