Influence of Composite Antioxidants to Asphalt Anti-Aging Performance

2012 ◽  
Vol 562-564 ◽  
pp. 380-384
Author(s):  
Bian Hua Li ◽  
Qi Cheng Liu ◽  
Yan Juan Yu ◽  
Du Ming Gong
Keyword(s):  
Softening Point ◽  
Aging Process ◽  
Aging Effect ◽  
Pavement Performance ◽  
Aging Mechanism ◽  
Needle Penetration ◽  
Aging Resistance ◽  
Before And After ◽  
Stable Improvement ◽  
Aging Performance

The durability of the asphalt is of great significance to its pavement performance, so more and more effort has been addressed on improving the asphalt anti-aging performance. In this work, the effects of antioxidant type and formula on the asphalt anti-aging performance were investigated through various measurements before and after aging process including needle penetration, softening point and ductility. Furthermore, the aging mechanism was analyzed via the FTIR (Fourier Transform Infrared) test. As a result, composite antioxidant can observably improve aging resistance of the asphalt. When the formula is 1.2%B+1.5%C+1.2%D, the needle penetration, ductility, softening point are as follows: 39.4×10-1mm, 148.1cm, 52.1°C. FTIR shows that carbonyl absorption peak reduced. Moreover, composite antioxidant can be more stable improvement of asphalt aging effect due to the cooperativity.

UV Aging Performance of Asphalt Containing LDHs

2014 ◽  
Vol 599 ◽  
pp. 265-270 ◽  
Author(s):  
Pan Fei Liu ◽  
Jun Zheng ◽  
Shao Peng Wu
Keyword(s):  
Aging Process ◽  
Complex Modulus ◽  
Short Term ◽  
Uv Aging ◽  
Oven Test ◽  
Aging Properties ◽  
Aging Resistance ◽  
Before And After ◽  
Double Hydroxides

In this paper the effect of Layered double hydroxides (LDHs) on aging properties of asphalts was studied. The thin film oven test TFOT tests and ultraviolet (UV) aging process were used to simulate short-term and long-term aging of asphalts, respectively. After aging, the physical properties and dynamic shear rheological behaviors of LDHs modified asphalts were investigated. The viscosity of LDHs modified asphalts was measured by Brookfield viscometer before and after UV aging. After UV aging, with an increase of LDHs, softening point and viscosity value of modified asphalts decreased, while both of ductility and penetration increased, compared to base asphalts. Temperature sweep tests showed that the complex modulus of LDHs modified asphalts was lower than that of base asphalt, while phase angle was higher. The results showed that LDHs improved the UV aging resistance of the asphalt, and it could prevent asphalt from UV aging.

scholarly journals Effect of Deformation and Aging on Properties of Al-4.1%Cu-1.4%Mg Aluminum Alloy

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Hao Wang ◽  
Changsheng Li ◽  
Jing Li ◽  
Xinglong Wei ◽  
Ruibin Mei
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aging Effect ◽  
Al Alloy ◽  
Exfoliation Corrosion ◽  
Aging Mechanism ◽  
Orthogonal Experiments ◽  
Before And After ◽  
Peak Aging ◽  
Aging Mechanisms

Deformation scheme and preheat treatment of Al-4.1%Cu-1.4%Mg aluminum alloy are chosen, homogenizing annealing at 430°C for 1.5 h, cooling to 250°C in furnace at a cooling rate of less than 30°C/h and then cooling to room temperature to make Al-4.1%Cu-1.4%Mg aluminum alloy annealed fully. Heat treatment tests of Al-4.1%Cu-1.4%Mg aluminum alloy mainly consisting of rolling and aging were conducted, and the optimum peak of aging mechanism is 190°C/12 h. Through comparison of microstructure and mechanical properties with different deformation rates and aging mechanisms, effect of deformation rates and aging mechanism on properties of Al-4.1%Cu-1.4%Mg aluminum alloy was analyzed, and the optimum double peak of aging mechanism is 135°C/7 h + 185°C/14 h. Orthogonal experiments were carried out to analyze mechanical and electrical properties of tested materials before and after deformation, and the effect of aging mechanism on Al-4.1%Cu-1.4%Mg Al alloy was analyzed, and the optimum regression of aging mechanism is 190°C/12 h + 240°C/40 min + 190°C/12 h. Aging scheme is closely related to corrosion resistance of Al-4.1%Cu-1.4%Mg aluminum alloy, and three different aging schemes can improve the corrosion resistance. The exfoliation corrosion evaluation results show that the aging effect on exfoliation corrosion ability order is RRA > two-step aging > peak aging.

Analytical Investigation on the Aging Process of Vegetable Insulating Oil

2013 ◽  
Vol 683 ◽  
pp. 608-611
Author(s):  
Ning Zhang ◽  
Ying Hui Han ◽  
Xue Yang ◽  
Shuo Zhang ◽  
Song Wei
Keyword(s):  
Ignition Temperature ◽  
Aging Process ◽  
Analytical Investigation ◽  
Biodegradation Rate ◽  
Electric Industry ◽  
Environment Friendly ◽  
Academic Field ◽  
Insulating Oil ◽  
Aging Mechanism ◽  
Aging Resistance

Development and improvement of environment-friendly insulating oil is one of the hot topics in electric industry and academic field. Vegetable insulating oil (VIO) has the higher ignition temperature and higher flash point .The biodegradation rate of VIO is also higher, while its electrical properties are equal to mineral insulating oil. A lot of technologies, including the addition antioxidants, hydrogenation, microwave, and other related technologies, can enhance the aging resistance and improve the practicability of the VIO. In this paper, the aging mechanism of VIO was analyzed and the related modified measures were summarized, which lays the foundation for further studies.

scholarly journals Experimental study on aging performance of elevator polyurethane buffer

2021 ◽  
Vol 236 ◽  
pp. 01051
Author(s):  
Facai Ren ◽  
Tao Jiang ◽  
Xiao Liang ◽  
Shaoyi Hou
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Aging Process ◽  
Quality Change ◽  
Elongation At Break ◽  
Hygrothermal Aging ◽  
Hot Environment ◽  
Before And After ◽  
Hardness Change ◽  
Aging Performance

In this paper, the hygrothermal aging experiments of polyurethane buffer materials for elevator were carried out for 5 days, 10 days, 15 days, 20 days, 25 days and 33 days. The quality change, hardness change, tensile strength and elongation at break of the test materials before and after the experiment were compared and analyzed. The results show that the aging process of polyurethane materials is accelerated by the humid and hot environment.

Study on Aging Characteristics of Warm Mix Asphalt: Using Softening Point as a Parameter of the Aging Kinetics Model

2010 ◽  
Vol 34-35 ◽  
pp. 227-231 ◽  
Author(s):  
Jiu Peng Zhang ◽  
Jian Zhong Pei ◽  
Shi Cui Xu ◽  
Yu Feng Bi
Keyword(s):  
Softening Point ◽  
Aging Process ◽  
Reaction Rate ◽  
Warm Mix Asphalt ◽  
Reaction Rate Constant ◽  
Kinetics Model ◽  
Aging Behavior ◽  
Kinetics Parameters ◽  
Aging Kinetics ◽  
Aging Performance

In order to indicate the aging process and evaluate the aging resistance of warm mix asphalt, thin film oven tests of original asphalts and warm mix asphalts were conducted, and the softening points of different asphalts in aging process were compared. Then, using softening point as a parameter, the aging kinetics model was established and the kinetics parameters were also calculated to reflect the aging performance of different asphalts. It is indicated that warm mix asphalt has larger activation energies and lower reaction rate constant than those of original asphalt, and the aging performance of warm mix asphalt after are better. The aging behavior of warm mix asphalt could be well evaluated by the aging kinetics model.

Sunlight exposure: the effects on the performance of paragliding fabric

2018 ◽  
Vol 69 (05) ◽  
pp. 381-389
Author(s):  
MENGÜÇ GAMZE SÜPÜREN ◽  
TEMEL EMRAH ◽  
BOZDOĞAN FARUK
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Air Permeability ◽  
Sunlight Exposure ◽  
Test Results ◽  
Coating Materials ◽  
Strength Tests ◽  
Before And After ◽  
The Relationship ◽  
Dark Blue

This study was designed to explore the relationship between sunlight exposure and the mechanical properties of paragliding fabrics which have different colors, densities, yarn counts, and coating materials. This study exposed 5 different colors of paragliding fabrics (red, turquoise, dark blue, orange, and white) to intense sunlight for 150 hours during the summer from 9:00 a.m. to 3:00 p.m. for 5 days a week for 5 weeks. Before and after the UV radiation aging process, the air permeability, tensile strength, tear strength, and bursting strength tests were performed. Test results were also evaluated using statistical methods. According to the results, the fading of the turquoise fabric was found to be the highest among the studied fabrics. It was determined that there is a significant decrease in the mechanical properties of the fabrics after sunlight exposure. After aging, the fabrics become considerably weaker in the case of mechanical properties due to the degradation in both the dyestuff and macromolecular structure of the fiber

scholarly journals How Small Molecules Affect the Thermo-Oxidative Aging Mechanism of Polypropylene: A Reactive Molecular Dynamics Study

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1243
Author(s):  
Fan Zhang ◽  
Yufei Cao ◽  
Xuan Liu ◽  
Huan Xu ◽  
Diannan Lu ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Acetic Acid ◽  
Small Molecules ◽  
Aging Process ◽  
Experimental Studies ◽  
Hydroxyl Group ◽  
Oxidative Aging ◽  
Reactive Molecular Dynamics ◽  
Aging Mechanism ◽  
Effects Of Temperature

Understanding the aging mechanism of polypropylene (PP) is fundamental for the fabrication and application of PP-based materials. In this paper, we present our study in which we first used reactive molecular dynamics (RMD) simulations to explore the thermo-oxidative aging of PP in the presence of acetic acid or acetone. We studied the effects of temperature and oxygen on the aging process and discussed the formation pathways of typical small molecule products (H2, CO, CO2, CH4, C2H4, and C2H6). The effect of two infection agents, acetic acid and acetone, on the aging reaction was analyzed emphatically. The simulation results showed that acetone has a weak impact on accelerating the aging process, while acetic acid has a significant effect, consistent with previous experimental studies. By tracking the simulation trajectories, both acetic acid and acetone produced small active free radicals to further react with other fragment products, thus accelerating the aging process. The first reaction step of acetic acid is often the shedding of the H atom on the hydroxyl group, while the reaction of acetone is often the shedding of the H atom or the methyl. The latter requires higher energy at lower temperatures. This is why the acceleration effect of acetone for the thermo-oxidative aging of PP was not so significant compared to acetic acid in the experimental temperature (383.15 K).

Research Progress on Aging of Polymer Modified Asphalt

2011 ◽  
Vol 71-78 ◽  
pp. 5038-5041
Author(s):  
Chang Qing Fang ◽  
Min Zhang ◽  
Jing Bo Hu ◽  
Ying Zhang ◽  
Rui En Yu
Keyword(s):  
Asphalt Pavement ◽  
Present Situation ◽  
Research Progress ◽  
Pavement Performance ◽  
Modified Asphalt ◽  
Aging Mechanism ◽  
Characterization Techniques ◽  
Aging Properties ◽  
Polymer Modified Asphalt ◽  
At Home

Asphalt aging is inevitable to the asphalt pavement performance, which will lead asphalt to hardening gradually and becoming brittle. Therefore, aging progress shortens the life of asphalt, but the study on polymer asphalt improves the phenomenon. The present situation on aging of polymer modified asphalt is summarized and the aging mechanism of modified asphalts is analyzed in the paper. Otherwise, the research progress at home and abroad on the aging properties of modified asphalt is introduced by a series of characterization techniques, which include mechanics technique, rheology technique, FTIR, GPC and so on

Anti-Aging Effect of Siraitia grosuenorii by Enhancement of Hematopoietic Stem Cell Function

2016 ◽  
Vol 44 (04) ◽  
pp. 803-815 ◽  
Author(s):  
Lin Bai ◽  
Guiying Shi ◽  
Yajun Yang ◽  
Wei Chen ◽  
Lianfeng Zhang
Keyword(s):  
Aging Process ◽  
Cell Function ◽  
Whooping Cough ◽  
Aging Effect ◽  
Guangxi Province ◽  
Facs Analysis ◽  
Hematopoietic Stem ◽  
Associated Proteins

Anti-aging has always been a popular topic, and there are many claims about the existence of factors that can slow, stop, or even reverse the aging process. Siraitia grosuenorii, a local fruit in china, has been used for the treatment of gastritis, sore throats, and whooping cough in traditional Chinese medicine. The individuals who took the juice of Siraitia grosuenorii regularly had increased longevity in the Guangxi Province, which is located in the Southern part of China. In this paper, we fed mice with Siraitia grosuenorii for 10 months to identify the role of Siraitia grosuenorii in anti-aging and to investigate its corresponding mechanism. The results showed that mice fed with Siraitia grosuenorii displayed a slower aging process. The extension of the aging process was due to the enhanced function of HSCs. FACS analysis showed that the number of LSKs, LT-HSCs, ST-HSCs and MPPs from Siraitia grosuenorii mice was decreased. In vitro, a clonigenic assay showed that LT-HSCs from Siraitia grosuenorii mice increased the ability of self-renewal. Moreover, Siraitia grosuenorii mice maintained the quiescence of LSKs, decreased the level of ROS and reduced the amount of senescence associated β-gal positive cells. Furthermore, Siraitia grosuenorii mice decreased the expression of senescence-associated proteins. Siraitia grosuenorii maintained quiescence, decreased senescence and enhanced the function of HSCs, slowing the aging process of mice.

scholarly journals STANDARD INDICATORS OF MODIFIED BITUMENS

2020 ◽  
Vol 5 (443) ◽  
pp. 188-195
Author(s):  
Zhurinov M.Zh., ◽  
◽  
Teltayev B.B., ◽  
Rossi C.O., ◽  
Amirbayev Ye.D., ◽  
...  
Keyword(s):  
Softening Point ◽  
Polyphosphoric Acid ◽  
Crumb Rubber ◽  
Petrochemical Plant ◽  
Direct Oxidation ◽  
Temperature Resistance ◽  
Needle Penetration ◽  
Technical Specifications ◽  
Bituminous Binders

The main standard indicators (penetration at 25 °С, ductility at 25 °С, softening point, Fraas point) have been determined and analyzed in this work for bitumens of the grades BND 100-130, BND 130-200 and 21 modified bitumens. The neat bitumens of the grades BND 100-130 and BND 130-200 have been produced at Pavlodar petrochemical plant from the oil of Western Siberia (Russia) by method of direct oxidation and they satisfy the requirements of the standard of Kazakhstan ST RK 1373-2013 “Bitumens and bituminous binders. Oil road viscous bitumens. Technical specifications”. The polymers Elvaloy 4170, Elvaloy AM, Kraton, Calprene 501, Butonal NS 198, SBS (L30-01A), KUMHO, crumb rubber and polyphosphoric acid have been accepted as modifiers. The modification of the bitumens has been performed in the laboratory of Kazakhstan Highway Research Institute (KazdorNII). The manufactured modified bitumens satisfy the requirements of the standard of Kazakhstan ST RK 2534-2014 “Bitumens and bituminous binders. Oil modified road bitumens. Technical specifications”. The standard indicators of the neat and modified bitumens have been determined in the laboratory of KazdorNII according to the following standards of Kazakhstan; penetration at 25 °C - ST RK 1226-2003 “Oil bitumens and binder materials based on bitumen. Method for determination of needle penetration depth”; ductility at 25 °С - ST RK 1374-2005 “Bitumens and bituminous binders. Method for determination of ductility”; softening point - ST RK 1227-2003 ‘Bitumens and bituminous binders. Determination of softening point by ring and ball method”; Fraas point - ST RK 1229-2003 ‘Oil bitumens and bituminous binders. Method for determination of Fraas point”. It is found out that all the applied polymers and polyphosphoric acid when adding them to the bitumens decrease the penetration thereby changing the grade of the bitumens. After modification 43 % of the polymer bitumens convert to the next grade, 43 % change their grade for 2 units and 14 % have the grade more viscous for 3 units. All the considered polymers and polyphosphoric acid increase the softening point thereby improving the high temperature resistance of the bitumens. It is determined that at modification of the bitumens of the grades BND 100-130 and BND 130-200 the increase of the Fraas point is 32-45 % and 28-93 % respectively. Most (71 %) of the polymers and polyphosphoric acid increase the Fraas point (decrease the low temperature resistance). In four cases out of twenty-one (19 %) the modification does not practically vary the Fraas point. The positive effect has been obtained only in two cases (10 %) for the modification of the bitumen of the grade BND 130-200 - the decrease of the Fraas point. The increase of the ductility for the bitumens has been recorded only in three cases (14 %) for their modification. In four cases (19 %) the initial ductility remains constant. In other cases (67 %) the ductility of the bitumens is decreased from 26 % to 86 %.

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