Storage stability of SBS/sulfur modified bitumens at high temperature: Influence of bitumen composition and structure

Utilization of waste corn stalks (CS) has seized extensive attention due to high annual output and hazardous impact of piling aside or direct combustion on environment. However, previously there has been a lot of emphasis on improvement of its energy efficiency as solid fuel while limited investigations are available which explore the possibility of applying corn stalks as performance enhancer in asphalt binder. The purpose of this study is to examine the potential of employing hydrochar as modifiers in asphalt binder by a series of experimental tests. In this study, two hydrochar were produced from corn stalks by a novel process called hydrothermal carbonization at a different reaction temperature. The two hydrochar and their responding hydrochar-modified asphalt (HCMA) were tested by chemical and rheological tests. Chemical analysis detected the interaction between hydrochar and binder factions, resulting in poor compatibility but satisfying anti-aging property. Even though hydrochar increased the viscosity of bitumen, implying worse workability, and caused poor storage stability, ameliorated performance of asphalt binder at high temperature by incorporating hydrochar was verified by various criteria such as higher performance grade (PG) failure temperature and lower non-recoverable creep compliance (Jnr). Moreover, higher reaction temperature makes hydrochar’s particles smaller and more homogeneous, which results in slightly lower enhanced high temperature performance, more satisfying workability, better storage stability, and greater anti-aging effect of hydrochar-modified asphalt. Eventually, this study provided a promising win-win solution to environment problems concerning corn stalk treatment and shortage of asphalt binder. Further exploration of methods to improve HCMA’s storage stability, real-scale corroboration on trial section and life cycle assessment of asphalt pavement containing hydrochar modifiers will be followed in the future.

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PHYSIOLOGICAL RESPONSE AND POLLEN VIABILITY OF PISUM SATIVUM GENOTYPES UNDER HIGH TEMPERATURE INFLUENCE

Acta Horticulturae ◽

10.17660/actahortic.2009.830.96 ◽

2009 ◽

pp. 665-672 ◽

Cited By ~ 9

Author(s):

V. Petkova ◽

V. Nikolova ◽

S.H. Kalapchieva ◽

V. Stoeva ◽

E. Topalova ◽

...

Keyword(s):

High Temperature ◽

Pisum Sativum ◽

Physiological Response ◽

Pollen Viability ◽

Temperature Influence

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The influence of reinforcement temperature on stiffness of reinforced concrete beams in fire conditions

Budownictwo i Architektura ◽

10.35784/bud-arch.2181 ◽

2013 ◽

Vol 12 (1) ◽

pp. 115-122

Author(s):

Michał Głowacki ◽

Marian Abramowicz ◽

Robert Kowalski

Keyword(s):

High Temperature ◽

Cross Section ◽

Static Load ◽

Concrete Beams ◽

Bending Moment ◽

Reinforced Concrete Beams ◽

Temperature Influence ◽

Calculation Results ◽

Tensile Zone ◽

In Fire

This paper describes the analysis of high temperature influence on beams with heated tensile zone. High temperature experiments were preformed under the static load of 50 or 70% of the destructive force ensuring constant value of bending moment in the central part of the heated beam. Beams with 2 reinforcement ratios – 0.44 and 1.13% were examined. In total four series of beams, three in each series (12 elements) were used. This paper analyses the reduction of relative beam cross section stiffness depending on reinforcement temperature. Experimentally obtained stiffness values calculated in two ways (element maximal deflection and deflection measured in three points of analysed element) were compared to calculation results made according to Eurocode. The performed analysis shows that reduction of the stiffness of element based on Eurocode calculations is slightly bigger than the experimentally obtained one.

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SBS/Carbon Black Compounds Give Asphalts with Improved High-Temperature Storage Stability

Polymers and Polymer Composites ◽

10.1177/096739110301100606 ◽

2003 ◽

Vol 11 (6) ◽

pp. 477-485 ◽

Cited By ~ 7

Author(s):

Shifeng Wang ◽

Yong Zhang ◽

Yinxi Zhang

Keyword(s):

Mechanical Properties ◽

High Temperature ◽

Carbon Black ◽

Storage Stability ◽

Dynamic Rheology ◽

High Temperature Storage ◽

Storage Behavior ◽

Styrene Butadiene ◽

Storage Properties ◽

Temperature Storage

Styrene-butadiene-styrene tri-block copolymer (SBS) modified asphalts are usually unstable during high-temperature storage, which presents an obstacle to their application. In this paper, SBS modified asphalts with improved high-temperature storage stability were prepared by incorporating carbon black (CB) into the SBS compounds. The effect of CB on the high-temperature storage properties, dynamic rheology, mechanical properties (softening point, viscosity etc.) and the morphologies of the modified asphalts were studied. It was found that the ratio of SBS to CB in the compound had a great effect on the high-temperature storage behavior. The modified asphalts were stable when the ratio of SBS/CB was around 2. CB had almost no effect on the dynamic rheology or the mechanical properties of the modified asphalts. The improvement in high-temperature storage behavior could be caused by decreasing the density difference and improving the compatibility between SBS and asphalt.

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Influence of Biochar Composition and Micro-Structure on the Denitration of Flue Gases at High Temperature

Applied Sciences ◽

10.3390/app10061920 ◽

2020 ◽

Vol 10 (6) ◽

pp. 1920

Author(s):

Yali Wang ◽

Nannan Qin ◽

Suping Cui ◽

Xiaoyu Ma ◽

Siyu Peng

Keyword(s):

High Temperature ◽

Functional Groups ◽

Rice Husk Ash ◽

No Reduction ◽

Fixed Bed ◽

Flue Gases ◽

Composition And Structure ◽

O2 Concentration ◽

Denitration Rate ◽

Positive Effect

Biochar materials are good reducers of nitrogen oxides. The composition and structure of biochar affect significantly its ability to reduce C–NO. In order to study the denitration of flue gases by biochar at high temperature, three kinds of biochar (bamboo charcoal (BC), rice husk ash (RHA), and straw charcoal (SC)) were mixed with cement raw meal in a fixed-bed quartz reactor at the temperature of 800–900 °C and O2 concentration of 0.5%–2%. The results showed that the initial denitration rate of BC was higher than that of RHA, and that of SC was the lowest. RHA had the largest specific surface area, and BC the smallest. The elements C, N, and O and the functional groups of the three types of biochar had a greater influence on the denitration rate than their structures. The denitration rate decreased faster as the O/C ratio increased, and the increase in the relative content of the N element induced the formation of nitrogen-containing functional groups catalyzing C–NO reduction. The content of the C–C bond affected directly the rate of denitration, and both (NCO)x and C–O bonds had a positive effect on the reduction capability of biochar. It can be concluded that the composition of biochar has an important effect on the reduction of C–NO.

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Investigation on the Short-Term Aging-Resistance of Thermoplastic Polyurethane-Modified Asphalt Binders

Polymers ◽

10.3390/polym10111189 ◽

2018 ◽

Vol 10 (11) ◽

pp. 1189 ◽

Cited By ~ 4

Author(s):

Ruien Yu ◽

Xijing Zhu ◽

Maorong Zhang ◽

Changqing Fang

Keyword(s):

Thermal Properties ◽

High Temperature ◽

High Speed ◽

Storage Stability ◽

Thermoplastic Polyurethane ◽

Short Term ◽

Modified Asphalt ◽

Aging Resistance ◽

High Temperature Storage ◽

Temperature Storage

In this reported work, thermoplastic polyurethane (TPU) was used as a reactive polymer modifying agent to prepare a modified-asphalt, using a high-speed shearing method. Physical performance tests of the TPU-modified asphalt were conducted before and after short-term aging, and the aging resistance was examined by the change in materials properties. In addition, low-temperature rheological properties, thermal properties, the high-temperature storage stability, and the aging mechanism of TPU-modified asphalt were also investigated. The results showed that the addition of TPU improved the aging resistance of base asphalt, which was evidenced by the increased penetration ratio and decreased softening point of the asphalt, after aging. Similarly, Fourier Transform infrared (FTIR) spectroscopy results verified that TPU improved the asphalt aging resistance. It was found that the TPU functional groups played a role in improving thermal properties, high-temperature storage stability, and in the dispersion of modified asphalt.

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