The basic performance of a novel high-efficiency spontaneous imbibition agent (SXJ-2) was investigated in this study. The mechanisms of spontaneous imbibition and wettability reversal of an oil-wet sandstone surface (OSS) by SXJ-2 were studied by infrared (IR) analysis, scanning electron microscopy (SEM), zeta potential determination, wetting angle experiment, and spontaneous imbibition determination in this work. The interfacial tension between oil and water for the SXJ-2 system is relatively low. SXJ-2 has a better performance than other systems in altering the surface wettability and has a higher imbibition recovery under the same time interval than the other systems. Spontaneous imbibition recoveries of cores with high permeability are greater than that of cores with low permeability for the same surfactant solution. Spontaneous imbibition recoveries decrease as the surfactant concentrations decrease, and the spontaneous imbibition recovery is the highest when the concentration is fixed at 0.5 wt %. The higher the initial water saturation the lower the spontaneous imbibition recovery is. The ultimate imbibition recoveries of cores increase with the decrease of core length. The spontaneous imbibition recovery at room temperature is higher than that at 80 °C. At the initial and later stages of imbibition, the experimental process is controlled by capillary force and gravity, respectively. While at the intermediate stage, the process of imbibition is jointly controlled by capillary force and gravity. The absorption peak at 1170 cm–1 is caused by the sulfone −SO2– stretching vibration, indicating that the surfactant molecule SXJ-2 is adsorbed on the surface of sandstone. Due to the adsorption of the surfactant SXJ-2 on the rock surface, the size of asphaltenes was reduced, rendering the solid surface more water-wet. Thus, the mechanism of the wettability reversal of the OSS by SXJ-2 was indirectly verified by IR analysis and SEM scanning.
According to the impact of fumes generated by asphalt pavement construction under poor air ventilation conditions on environment and operators at pavement construction and mechanism of asphalt fumes generation this article provides the method of addition of addictives in asphalt to suppress fumes due to asphalt pavement construction. Through in house test the variation law of asphalt fumes with heating temperature and heating time. The result shows that with an increase of heating time, the yield of asphalt fumes appears increasing tendency. During the initial stage, the smoke yielding rate is fast; in later stage the variation slows down; and finally the variation becomes stable. With higher heating temperature, the yield of asphalt fumes is greater. Partial addictives are selected for smoke suppression effect test from flame retardant agent, plastic smoke suppression agent, physical adsorbent, polymer modified agent and aging resistant agent. SBS and nanometer calcium carbonate compound type modifying agent of better smoke suppression effects are selected for test and asphalt fumes is reduced around 29.0% in total.
In study of waste old plastic modified asphalt majority study staff generally cut and then directly the waste old plastic recycled into asphalt for shear cutting, mixing modifying. The modified asphalt made by this kind of method easily segregates, and makes a poor stability and uniformed property of modified asphalt. This obviously has become a difficult problem of waste old plastic modified asphalt. This article through DSC (Differential Scanning Calorimeter) test studies the property of domestic waste old plastic modifying agent and granular waste old plastic modifying agent made by special method. A study by comparison on the fundamental property and storage stability of this two types modifying agent modified asphalt is made. The result from study shows that the crystallization degree of specially made waste old plastic modifying agent decreases compared with decrease of molecule amount and molecule amount distribution becomes wide and inner cohesive energy becomes small and branching degree becomes great and flexibility is reduced. The waste old plastic modifying agent (PMB) can not only improve softening point of asphalt but also has sound storage stability without segregation and solve the segregation problem of modified asphalt. The mechanism of segregation of waste old plastic modified asphalt is analyzed. The study achievement has certain reference and applicable values in respects of recycling for use of waste old plastic and cost saving of modified asphalt and improving road pavement property
By in house experiment a study is made on the asphalt modifying agent made from plastic basin, stool and bucket so on domestic waste plastic and the effect of modifying asphalt. The result shows: (1) the modifying agent made of waste plastic can considerably improve softening point of asphalt and reduce needle penetration; (2) for the modifying asphalt made from waste plastic by different making method its storage stability differs and PMA modifying asphalt made from waste plastic grain by plastic extruder has severe segregation and poor storage stability. But the PMB waste plastic modifier specially made under given study can not only improve the high temperature stability of asphalt but also no segregation of modifying asphalt and has sound storage stability; (3) Waste plastic can apparently improve the degree of stability of asphalt mixture and the effect of stability degree improvement of PMB is better than that of PMA and the improvement of flow value is not obvious. The achievement of study has referential application value for reuse of waste plastic and improvement of asphalt road pavement performance.
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