Moisture Resistance of Sulfur-Extended Asphalt Concrete. Results of the Study and Features of Definition

Le, Huu Tuan; Gladkikh, Vitaliy; Korolev, Evgeniy; Grishina, Anna

doi:10.31659/0585-430x-2021-789-3-39-44

Cited by 1 publication

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“…Further improvement of the technology Materials 2021, 14, 7218 2 of 10 of sulfur asphalt concrete is presented in [18]. Nevertheless, in works [19][20][21] it is shown that sulfur-asphalt concrete is characterized by insufficiently high water resistance with prolonged water saturation. The reasons for this may be [21]:…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, in works [19][20][21] it is shown that sulfur-asphalt concrete is characterized by insufficiently high water resistance with prolonged water saturation. The reasons for this may be [21]:…”

Section: Introductionmentioning

confidence: 99%

“…Further improvement of the technology of sulfur asphalt concrete is presented in [ 18 ]. Nevertheless, in works [ 19 , 20 , 21 ] it is shown that sulfur-asphalt concrete is characterized by insufficiently high water resistance with prolonged water saturation. The reasons for this may be [ 21 ]: Chemical interaction of sulfur and toxic gases formed during the interaction of sulfur with bitumen [ 21 , 22 ], with dispersed phases with the formation of water-soluble compounds (chemical hypothesis); The processes of crystallization of sulfur in the volume of the sulfur-bitumen binder and the formation of capillaries that increase the permeability of asphalt concrete for liquid media (physical hypothesis).…”

Section: Introductionmentioning

confidence: 99%

“…Chemical interaction of sulfur and toxic gases formed during the interaction of sulfur with bitumen [ 21 , 22 ], with dispersed phases with the formation of water-soluble compounds (chemical hypothesis);…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%