Green sulfur-extended asphalt concrete: mix design of the complex binder

Gladkikh, Vitaliy; Korolev, Evgeniy; Gladkikh, Valentina

doi:10.1051/matecconf/20168604023

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…The authors of works [ 1 , 2 , 3 , 4 , 5 , 6 ] have shown that the use of sulfur as a modifier for asphalt concrete is a promising direction, allowing the expansion of the temperature range of operation of asphalt concrete pavements in the area of high positive temperatures. In addition, in works [ 5 , 6 , 7 ] it is shown that the introduction of sulfur provides a decrease in the amount of bitumen in the asphalt concrete mixture, as well as a decrease in the temperature of preparation and laying The use of sulfur improves not only the operational properties of sulfur asphalt concrete (SEA) but also the technological properties of the mixture. Thus, in [ 8 ], the rheological properties of a bitumen-sulfur melt were investigated and it was shown that the introduction of sulfur significantly reduces the viscosity of such melts.…”

Section: Introductionmentioning

confidence: 99%

Reasons for Reduced Moisture Resistance of Sulfur-Extended Asphalt Concrete

Le¹,

Korolev²,

Grishina³

et al. 2021

Materials

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The paper presents the results of a study of the mechanism for reducing the moisture resistance of sulfur-extended asphalt concrete. It is shown that a decrease in moisture resistance occurs due to the occurrence of chemical and physical processes. At the same time, it was found that during the manufacture of sulfur-bitumen composites, toxic gases H2S and SO2 are formed, which are capable of interacting with a mineral filler, as well as the interaction of sulfur with a mineral powder with the formation of sulfur-containing water-soluble salts, the extraction of which leads to a decrease in the moisture resistance of sulfur-bitumen materials. The change in the rate of leaching of these substances from the composite is due to the physical process caused by the crystallization of sulfur and the formation of a capillary structure, which significantly increases the rate of leaching of calcium and magnesium salts, which are products of dissolution or hydrolytic decomposition of water-soluble products of the interaction of sulfur, H2S and SO2 gases with calcium and magnesium carbonates. The intensity of chemical and physical processes intensifies with an increase in the amount of sulfur in sulfur-bitumen materials.

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Section: Introductionmentioning

confidence: 99%

Reasons for Reduced Moisture Resistance of Sulfur-Extended Asphalt Concrete

Le¹,

Korolev²,

Grishina³

et al. 2021

Materials

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“…Sulfur-extended asphalt is of improved physical, mechanical and operational properties. In particular, such asphalt is characterized by improved fatigue life under cyclic loads and increased resistance to rutting [5][6][7][8][9]. It is also resistant to the effects that are caused by various aqueous solutions and petrochemicals -gasoline and motor oils [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Structure and physical properties of sulfur with nanoscale carbon modifiers

2019

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It is known that sulfur-extended asphalt is of improved operational properties. Binders with higher content of polymeric sulfur are characterized by higher operational properties. Unfortunately, many sulfur modifiers are volatile and toxic. The objective of article is to investigate the structure of sulfur with admixtures of saturated aliphatic hydrocarbon and two types of nanoscale carbon modifiers. It was shown that such admixtures lead to formation of the fine-crystalline structure of high uniformity; average size of crystals decreases in order of magnitude. Structural changes are accompanied by notable improvement of compressive strength (the values of compressive strength increases in about 3 times). The practical value of the conducted studies is due to possible application of nanomodified sulfur in road construction.

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“…In particular, such materials are characterized by high resistance to rutting, extended fatigue life and corrosion resistance [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introduction and Prior Workmentioning

confidence: 99%

Viscosity of plasticized sulfur-extended asphalt: two-factor sequential optimization

et al. 2017

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Abstract. The compounding properties of construction materials for pavements strongly depend on dynamic viscosity of the binder. The favorable class of binder is plasticized sulfur-extended asphalt. Unfortunately, the viscosity of such a binder has not been studied in detail. In the present work we have performed experimental two-factor sequential constrained optimization of the viscosity. The binders under examination were made of asphalt, sulfur and paraffin. It was revealed that the addition of sulfur and paraffin leads to a significant decrease of the dynamic viscosity. The obtained results allowed us to estimate mixture and temperature that correspond to optimal compounding properties of the sulfur-extended asphalt concrete. In particular, for plasticized asphalt concrete with 30% of sulfur and 5% of paraffin, the optimal processing temperature is 25 0 C lower than for ordinary asphalt. Since low preparation temperatures correspond to low emission of toxic gases and low processing costs, we can consider the concretes that will be based on plasticized sulfur-extended asphalt as green paving materials.

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Green sulfur-extended asphalt concrete: mix design of the complex binder

Cited by 5 publications

References 8 publications

Reasons for Reduced Moisture Resistance of Sulfur-Extended Asphalt Concrete

Reasons for Reduced Moisture Resistance of Sulfur-Extended Asphalt Concrete

Structure and physical properties of sulfur with nanoscale carbon modifiers

Viscosity of plasticized sulfur-extended asphalt: two-factor sequential optimization

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