oven test
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2021 ◽  
Vol 23 (3) ◽  
pp. 227
Author(s):  
P. Caputo ◽  
M. Porto ◽  
V. Loise ◽  
A. Abe ◽  
B. Teltayev ◽  
...  

The organic fraction derived from the differentiated collection of urban waste is mainly composed of fatty acids, medium molecular weight hydrocarbons and cellulose. This peculiar composition gave us insight into the possible use of organic waste to improve bitumen’s characteristics (possible antioxidant, regenerating and/ or viscosifying additive for road pavements). The issue of the disposal of organic waste is a global one and it’s constantly of increasing concern. This study looks to alleviate this problem by finding ways for this waste fraction to be utilized for the greater good- in this case, as an additive for bitumen binder in road pavements. The present study is focused on the use of waste as it is and waste treated by the FENTON process (treatment with ferrous sulphate and hydrogen peroxide solution). Dynamic Shear Rheology (DSR) and aging tests (Rolling Thin Film Oven Test, RTFOT) showed that two of the additives tested in this study proved effective: one can be utilised as a viscosifying agent and the other can be us ed as a filler.


2021 ◽  
Vol 11 (14) ◽  
pp. 6528
Author(s):  
Paolino Caputo ◽  
Cesare Oliviero Rossi

To date, few methods allow distinguishing a fluxing effect of an additive for bitumen from a regenerating effect. This research aims at identifying a method to accurately establish whether an oxidized bitumen has been regenerated or has simply been fluxed by a softener. Oxidized bitumens, simulating the aging process that results in road pavement lifetime, were prepared by the Rolling thin film oven test (RTFOT) procedure for 225 min and the Pressure Aging Vessel (PAV) procedure. Their asphaltene parts were extracted and analyzed by calorimetry (Differential Scanning Calorimetry DSC), and the results were compared with the presence and absence of a fluxing agent and real rejuvenators. The self-consistent results showed that the thermal properties of the asphaltene fractions is a sound probe to monitor the effect of rejuvenation clearly distinguishable from the mere fluxing effect. This preliminary study might allow the creation of standard protocols capable of identifying a priori the rejuvenating effect of an additive in the future. Furthermore, given the widespread use of calorimetry for the characterization, it tends to become a widely accessible and useful tool for this purpose in material characterization laboratories.


2021 ◽  
Vol 4 (1) ◽  
pp. 955-964
Author(s):  
Phan Thi Phuong Thao ◽  
Tran Thi Thu Hang ◽  
Pham Le Nguyet Anh ◽  
Vu Hong Son

This study examined the effectiveness of different antioxidative compounds, namely 0.2% BHA (Butylated hydroxyanisole) + BHT (butylated hydroxytoluene), 0.03% α – tocopherol, and 3% and 6% tea seed oil (TSO) on the oxidative stability of vegetable oils. Four commonly used oils, viz. rapeseed oil (RSO), peanut oil (PNO), sunflower oil (SFO),  and soybean oil (SBO), were assessed by the Schall Oven test method and monitored during the 12-day preservation period under 60°C. The total oxidation values (TOTOX) of the samples treated with 6% TSO were lower than those treated with 0.2% BHA+BHT. The results indicated the potential of TSO as a novel natural antioxidant for dietary vegetable oils. Our study also suggested that TSO could serve as an effective substitution for currently used synthetic antioxidants such as BHA and BHT.


2020 ◽  
Vol 9 (11) ◽  
pp. e83091110366
Author(s):  
Lidiana souza correia Lima ◽  
Nhaiara Monteiro de Farias Lima ◽  
Gizele Almada Cruz ◽  
Francisca Lívia de Oliveira Machado ◽  
Rinaldo dos Santos Araújo ◽  
...  
Keyword(s):  

A manteiga pode ter o tempo de consumo reduzido em virtude da suscetibilidade à oxidação e à rancidez hidrolítica, mas a degradação dos lipídios pode ser inibida por meio da ação de antioxidantes naturais ou sintéticos. A própolis é uma substância natural produzida pelas abelhas e reconhecida por seu potencial bioativo. Este trabalho objetivou avaliar a capacidade antioxidante da solução hidroalcoólica de própolis como conservante natural na manteiga. As amostras (A) controle, (B) manteiga com extrato de própolis 100 ppm, (C) manteiga com extrato de própolis 200 ppm e (D) manteiga com hidroxitolueno butilado (BHT) foram submetidas a testes de estabilidade oxidativa em tempo acelerado (Schaal Oven Test), análises físico-químicas, microbiológicas e sensoriais. Os resultados para o Índice de Peróxido nas amostras C e D indicaram eficiência antioxidante semelhante entre própolis e BHT. As amostras A e C apresentaram elevada frequência de respostas na faixa de aceitação, contudo a amostra A exibiu a maior porcentagem de preferência pelos provadores. O teste de intenção de compra mostrou porcentagem de respostas positivas superiores a 50% para ambas as amostras. Conclui-se que a própolis pode atuar de forma eficaz como antioxidante na manteiga, contudo a forma de extrato alcóolico agrega características sensoriais que afetam o sabor do produto.


2020 ◽  
Vol 9 (10) ◽  
pp. e4229107841
Author(s):  
Marcela Donato ◽  
Camila Duarte Ferreira Ribeiro ◽  
Jane Mara Block ◽  
Itaciara Larroza Nunes
Keyword(s):  

O objetivo do presente trabalho foi avaliar o efeito da adição de óleo de palma bruto nanoencapsulado (OPB-NE) como antioxidante em molho para salada em teste de oxidação acelerada (Schaal Oven Test). O OPB-NE foi caracterizado quanto a eficiência de encapsulamento (EE), tamanho de partícula (TP), potencial Zeta (pZ) e índice de polidispersibilidade (PDI). O Óleo de palma bruto livre (OPB-L) e OPB-NE foram avaliados quanto aos carotenoides totais (CT) e atividade antioxidante (AA). Foram desenvolvidos três molhos para salada sabor mostarda (A-molho base controle/B-molho base + OPB-NE/C-molho base + BHA e BHT). Nos molhos foram determinadas a composição centesimal e o teor de CT. OPB-L, OBP-NE e os molhos foram submetidos ao Schaal Oven Test em estufa (60 ± 5º C/15 dias/circulação de ar). Após este período os índices de acidez (IA), peróxidos (IP) e dienos (DC) e trienos (TC) conjugados foram determinados. O OPB-NE apresentou EE de 95,66%, TP de 0,29 µm, heterogeneidade de tamanhos de partícula (PDI 1,00), pZ de -41,80 mV, e 12,11% de AA. O OPB-NE e o molho B apresentaram teor de CT de 561,77 ± 10,97 e 442,31 ± 12,14 µg.g-1, respectivamente. Os molhos não tiveram diferença na composição centesimal. OPB-NE apresentou maior IA do que o OPB-L, valores de IP e DC inferiores, e TC semelhantes ao final de 15 dias. Nos molhos houve diferença apenas no IP, com maior estabilidade do molho C, seguido pelo B, mais estável que o A. Concluiu-se que o OPB-NE pode ser uma alternativa aos antioxidantes sintéticos BHA e BHT em molhos para salada.


2019 ◽  
Vol 6 (1) ◽  
pp. 10
Author(s):  
Devita Cahyaningsih ◽  
Nina Ariesta ◽  
Rizki Amelia

PHYSICAL PROPERTIES OF LIQUID SHOWER SOAP CONTAINED OF SODIUM LAURETH SULFATE (SLES) SURFACTANTSoap could be produced by saponification and neutralization process. It was contained of fatty acid, KOH, glycerin, and surfactan. The properties of surfactant determined physical properties of soap as the quality parameter of soap.  The study was conducted to examine some of the physical parameters of liquid bath soap (stability test: color, aroma, viscosity, homogeneity, viscosity and pH) in accordance with applicable standards. The study was conducted using soap which was contained of SLES surfactants (Sodium Laureth Ether Sulfate). The results were pH 8.61 and viscosity 55254 cps on stability test include oven test, cycle test, room test, and sun test.Keywords: liquid shower, Sodium Laureth Ether Sulfate, soap stability ABSTRAKSabun yang merupakan salah satu kosmetik pembersih dapat dibuat melalui dua proses, yaitu saponifikasi dan netralisasi. Sabun tersusun dari berbagai bahan, seperti asam lemak, KOH, gliserin, dan surfaktan. Sifat surfaktan dalam sabun menentukan sifat fisik dari sabun yang dihasilkan dan sebagai salah satu faktor penentu mutu. Tujuan dari penelitian ini adalah untuk menguji beberapa parameter fisik sabun mandi cair (uji stabilitas: warna, aroma, kekentalan, homogenitas, viskositas dan pH) sesuai dengan standar yang berlaku, sehingga dapat dilanjutkan ke tahap pengujian berikutnya. Penelitian ini dilakukan dengan menggunakan surfaktan SLES (Sodium Laureth Ether Sulfate). Beberapa parameter fisik terukur adalah pH 8,61 dan viskositas 55254 cps pada pengujian stabilitas meliputi oven test, cycle test, room test, dan sun test.Kata Kunci: sabun cair, Sodium Laureth Ether Sulfate, stabilitas sabun


Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1039 ◽  
Author(s):  
Bo Li ◽  
Jianing Zhou ◽  
Zhihao Zhang ◽  
Xiaolong Yang ◽  
Yu Wu

Effective approaches are required to be developed to solve the poor compatibility and thermal stability problems of crumb rubber-modified asphalt (CRMA). This study focuses on a method called microwave activation. However, seldom researches pay attention to the properties of MACRMA after aging. The objective of this study was to prepare microwave-activated CRMA (MACRMA) and investigate the performance of asphalt after aging. The samples were subjected to thin-film oven test (TFOT) at different times and temperatures. The effect of heat aging on the properties of MACRMA was evaluated by three indicator tests: viscosity, dynamic shear rheology test (DSR), and repeat creep recovery test (RCRT). The test results indicated that the MACRMA after two aging conditions had noticeably lower performance values (e.g., penetration, ductility) compared to unaged samples, and thus, the need to control temperature and time for mixing and construction was verified to be important. In addition, the G*/sin δ and phase angle values were largely influenced by the TFOT aging temperature and time. The MACRMA’s ability to recover was improved after aging. Compared with the aging temperature, the aging time had a more significant effect on the deformation and recovery ability of MACRMA.


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