scholarly journals Reasons for Reduced Moisture Resistance of Sulfur-Extended Asphalt Concrete

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7218
Author(s):  
Huu Tuan Le ◽  
Evgenij V. Korolev ◽  
Anna N. Grishina ◽  
Vitaly A. Gladkikh
Keyword(s):  
Asphalt Concrete ◽  
Water Soluble ◽  
Moisture Resistance ◽  
Physical Processes ◽  
Capillary Structure ◽  
Hydrolytic Decomposition ◽  
Magnesium Salts ◽  
Calcium And Magnesium ◽  
Sulfur Containing ◽  
Decomposition Of Water

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.

scholarly journals Complex character of the influence of polycarboxylic and phosphonic acids on the crystallization of calcium and magnesium salts in dynamic conditions

2021 ◽  
Vol 65 (2) ◽  
pp. 168-177
Author(s):  
E. V. Vorobieva ◽  
A. D. Vorobiev ◽  
I. V. Shestak ◽  
D. V. Cherednichenko ◽  
S. V. Bucha
Keyword(s):  
Induction Period ◽  
Phase Formation ◽  
Water Soluble ◽  
Electron Microscopic ◽  
Phosphonic Acids ◽  
Dynamic Conditions ◽  
Influence Of Water ◽  
Microscopic Studies ◽  
Magnesium Salts ◽  
Calcium And Magnesium

The influence of water-soluble organic compounds (adipic, polyaspartic and phosphonic acids) and their compositions on the crystallization of calcium and magnesium salts in dynamic conditions has been studied. It is found that the induction period of phase formation increases in the presence of polyaspartic and phosphonic acids 2.3–5.2 times in the range of their content from 0.05 to 0.2 ppm. The results of XRD and electron microscopic studies confirm the change in the phase composition and morphology of the crystalline precipitate that is formed. The dibasic carboxylic acid influence on the induction period, composition and structure of the precipitate is much less. It is established that the composition of organic acids also increases the induction period of phase formation. The complex inhibitor provides an increase in the critical supersaturation level in the system. The phosphonic and carboxyl groups of the inhibitor interact with calcium and magnesium ions and block the crystallization nuclei. When interacting with the dicarboxylic acid and polyacid adsorption on the surface of the formed crystals, the microcrystals dissolve.

DETERMINATION OF CORROSION INFLUENCE ON FUEL METAL, OBTAINED FROM SECONDARY POLYMER RAW MATERIALS

2021 ◽  
pp. 48-56
Author(s):  
K. Сhevchenko ◽  
A. Grigorov ◽  
I. Sinkevich
Keyword(s):  
Raw Materials ◽  
Petroleum Products ◽  
Copper Plate ◽  
Water Soluble ◽  
Synthetic Fuels ◽  
Laboratory Setup ◽  
Corrosive Effect ◽  
Preliminary Preparation ◽  
Sulfur Containing

The article proposes to determine the corrosion effect on fuel metals under dynamic conditions, when washing the prepared copper plate of a certain size, a significant amount of fuel at a certain speed and temperature of the study. This approach will significantly reduce the duration of the study (up to 100 minutes) and is closer to the real conditions of contact of the fuel with a metal surface, in comparison with the standardized method, which is widely used today. Using the proposed laboratory setup, the study was subjected to fuel (200–360 °C), which was obtained by thermal destruction of secondary polymer raw materials, in particular polypropylene. The obtained results showed that the investigated fuel, despite the temperature, the amount of circulating fuel and its water content, does not have a corrosive effect on the copper plate, which can be explained by the absence of corrosive substances in the fuel: water-soluble mineral acids and alkalis, active sulfur compounds and organic acids. However, it should be kept in mind that in polyolefin raw materials, in the form of contamination, there may be products made of other materials, such as rubber and polyvinyl chloride. This can happen when the sorting technology is violated or during the preliminary preparation of raw materials and, in turn, will contribute to the increase in sulfur-containing and chlorine-containing compounds in the fuel, which are characterized by high corrosion activity and should be necessarily removed from the fuel. Note that the fuel obtained from secondary polymer raw materials, in the absence of sulfur-containing and chlorine-containing compounds, is quite promising for the creation on its basis of modern synthetic fuels, analogues of classic petroleum products.

Studies on a new water-soluble sulfur-containing cellulose derivative

1994 ◽  
Vol 54 (13) ◽  
pp. 1989-1995 ◽  
Author(s):  
Huiyang Zeng ◽  
Wei Li ◽  
Zhuomei Li
Keyword(s):  
Water Soluble ◽  
Cellulose Derivative ◽  
Sulfur Containing

Production and bioavailability of calcium and magnesium salts of omega-3 fatty acids

2009 ◽  
Vol 1 (2) ◽  
pp. 217-221 ◽  
Author(s):  
Jaroslav A. Kralovec ◽  
H. Stephen Ewart ◽  
Jeffrey H.D. Wright ◽  
Lynn V. Watson ◽  
Dorothy Dennis ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Omega 3 Fatty Acids ◽  
Omega 3 ◽  
Magnesium Salts ◽  
Calcium And Magnesium

Decomposition of water-soluble mononitrosyl iron complexes with dithiocarbamates and of dinitrosyl iron complexes with thiol ligands in animal organisms

Nitric Oxide ◽  
2008 ◽  
Vol 18 (3) ◽  
pp. 195-203 ◽  
Author(s):  
Vladimir A. Serezhenkov ◽  
Alexander A. Timoshin ◽  
Tsvetina R. Orlova ◽  
Vasak D. Mikoyan ◽  
Lioudmila N. Kubrinа ◽  
...  
Keyword(s):  
Iron Complexes ◽  
Dinitrosyl Iron Complexes ◽  
Water Soluble ◽  
Thiol Ligands ◽  
Dinitrosyl Iron ◽  
Decomposition Of Water

Mechanistic studies on the decomposition of water soluble azo-radical-initiators

1998 ◽  
pp. 2009-2018 ◽  
Author(s):  
Roy U. Rojas Wahl ◽  
Liansheng Zeng ◽  
Stephen A. Madison ◽  
Richard L. DePinto ◽  
Brian J. Shay
Keyword(s):  
Water Soluble ◽  
Mechanistic Studies ◽  
Radical Initiators ◽  
Decomposition Of Water

Antioxidant and antiinflammatory activity of new water-soluble sulfur-containing phenolic compounds

2007 ◽  
Vol 72 (6) ◽  
pp. 644-651 ◽  
Author(s):  
N. K. Zenkov ◽  
E. B. Menshchikova ◽  
N. V. Kandalintseva ◽  
A. S. Oleynik ◽  
A. E. Prosenko ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Antiinflammatory Activity ◽  
Water Soluble ◽  
Sulfur Containing

scholarly journals Absence of one component of spectrin adenosine triphosphatase in hereditary spherocytosis

Blood ◽  
1975 ◽  
Vol 46 (6) ◽  
pp. 945-954 ◽  
Author(s):  
FH Kirkpatrick ◽  
GM Woods ◽  
PL La Celle
Keyword(s):  
Atpase Activity ◽  
Soluble Protein ◽  
Adenosine Triphosphatase ◽  
Hereditary Spherocytosis ◽  
Water Soluble ◽  
Water Soluble Protein ◽  
Normal Water ◽  
Calcium And Magnesium ◽  
Low Levels ◽  
Increased Activity

Abstract The stimulation by calcium and magnesium of ATPase activity of isolated ghosts, of water-soluble protein (spectrin), and of residual vesicles, derived from normal erythrocytes and from hereditary spherocytes (H.S.), has been measured. The ATPase activity found in normal water- soluble protein (WSP) at low levels of calcium (0.1–2.0 mM) is essentially absent in H.S. water-soluble protein, but the ATPase activity with magnesium and with high levels of calcium (60-100 mM) is the same in H.S. and normal WSP. Compared to normal, H.S. ghosts have increased Mg2+-stimulated activity. This increased activity is retained by the sedimentable vesicles (“residue”) after extraction of the ghosts with 0.025 mM EDTA. The Ca2+, Mg2+-ATPase associated with the calcium pump is not significantly different in H.S.

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