Microstructural evolution of asphalt induced by chloride salt erosion

Long, Zhengwu; Guo, Nanning; Tang, Xianqiong; Ding, Yonghui; You, Lihua; Fang, Xu

doi:10.1016/j.conbuildmat.2022.128056

Cited by 30 publications

(3 citation statements)

References 61 publications

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“…The common roughness indices are S a , S q , and S Z , which are shown in Table 5 [57]. As shown in Figure 11, it can be seen that the three indicators are consistent for the roughness changes with different dosages of CR powder.…”

Section: Micromorphological Analysesmentioning

confidence: 77%

Investigations on Adhesion Characteristics between High-Content Rubberized Asphalt and Aggregates

et al. 2022

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The use of waste tires to prepare rubberized asphalt has been a hot trend in recent years, and the characteristics of adhesion between rubberized asphalt and aggregates are important factors affecting the performance of asphalt pavement. However, there is a lack of uniform results on the adhesion characteristics of rubberized asphalt. Therefore, crumb-rubber-modified asphalt (CRMA) with 15%, 20%, and 25% rubber contents was prepared in this work, and the basic rheological parameters and cohesive energy of the rubberized asphalt were characterized by DSR. The adhesion properties between rubberized asphalt and aggregates were characterized based on macroscopic binder bond strength (BBS), surface free energy (SFE) theory, and nanoscale atomic force microscopy (AFM) tests. The results show that crumb rubber (CR) can improve the high-temperature elastic properties of asphalt; secondly, CR can have a negative impact on the maximum tensile strength of asphalt and aggregates. CR can improve the SFE parameter of asphalt. The work of adhesion of rubberized asphalt and limestone is the highest, followed by basalt and, finally, granite. Finally, CR can cause the catanaphase in asphalt to gradually break down and become smaller, and the adhesion of rubberized asphalt can be reduced. Overall, CR can reduce the adhesion performance of asphalt, and this work provides a reference for the application of rubberized asphalt.

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Section: Micromorphological Analysesmentioning

confidence: 77%

Investigations on Adhesion Characteristics between High-Content Rubberized Asphalt and Aggregates

et al. 2022

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“…Nonetheless, the NaCl solution permeating the asphalt mixture induces erosion damage, with an observed residual stability loss of roughly 7% and a TSR decrement of about 14%. This could be due to the formation of an unstable, water-soluble amorphous film by chloride salts on the asphalt surface, encapsulating the honeycomb structure and thereby impairing the mixture's integrity, leading to diminished water stability [35]. As the temperature plunges to −25 • C, surpassing the freezing point of the 20% NaCl solution, a pronounced decline in both residual stability (approximately 17%) and TSR (about 31%) is noted.…”

Section: Water Stability Of the Asphalt Mixture After Freeze-thaw Cyclesmentioning

confidence: 99%

Influence of Deicer on Water Stability of Asphalt Mixture under Freeze–Thaw Cycle

Guo,

Kovalskiy,

Nian

et al. 2023

Sustainability

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In seasonal frozen soil areas, the repeated freeze–thaw cycle of internal moisture in asphalt mixture in winter and spring will accelerate the peeling of asphalt film and aggravate the water damage of asphalt pavement. It is of great significance to carry out the attenuation law of mechanical properties of asphalt mixture under freeze–thaw cycles to prevent and reduce the economic losses caused by water damage to asphalt pavement. This study will investigate the impact of deicer application on the water stability of asphalt mixtures within the climatic conditions prevalent in Northwest China. Specifically, freeze–thaw cycle tests were administered to two types of dense-graded asphalt mixtures under three distinct deicer solutions and three disparate low-temperature environments. The Marshall water immersion test and freeze–thaw splitting test were employed to evaluate the water stability of asphalt mixtures subject to multiple factors, and the relative importance of each factor was statistically analyzed using the acquired data. Results demonstrated that AC-13 and AC-16 asphalt mixtures (AC is asphalt-concrete, which is asphalt concrete, and 13 or 16 represents the maximum particle size of aggregate (13 mm or 16 mm)), saturated in 15% CH4N2O, 20% NaCl, and 20% CH2CH3OH solutions, underwent a varying number of freezing–thawing cycles (0, 5, 10, 15, 20, 25, and 30) at temperatures of −5 °C, −15 °C, and −25 °C, respectively, displayed a discernible decline in their residual stability MS0 and freeze–thaw splitting tensile strength ratio TSR. This decline was particularly marked when temperatures dropped below the solution’s freezing point. Disregarding the fixed factors of weather variation (different low-temperature environments) and road service duration (number of freezing–thawing cycles), the aggregate grading imposed a more pronounced influence on asphalt mixture water stability than the presence of deicers.

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“…The complex salt environment has continued to have a negative impact on the performance of engineering materials [ 15 , 16 , 17 ]. Among them, sulfate erosion is one of the important factors that induces the failure of cement-stabilized soils [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Durability Degradation of Geopolymer-Stabilized Soil under Sulfate Erosion

Wang

Chen²,

Xia

et al. 2022

Materials

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In this study, the potential application of slag-fly ash-based geopolymers as stabilizers for soft soil in sulfate erosion areas was investigated to promote environmental protection and waste residue recycling. The changes in the physical and mechanical properties and microstructure characteristics of cement-stabilized soil/geopolymer-stabilized soil under sulfate erosion were comparatively studied through tests such as appearance change, mass change, strength development, and microscopic examination. The results show that the sulfate resistance of stabilized soil is significantly affected by the stabilizer type. In the sulfate environment, the cement-stabilized soil significantly deteriorates with erosion age due to the expansion stress induced by AFt, while the geopolymer-stabilized soil exhibits excellent sulfate resistance. The slag-fly ash ratio (10:0, 9:1, 8:2 and 7:3) is an important factor affecting the sulfate resistance of geopolymer-stabilized soils, and the preferred value occurs at 9:1 (G-2). When immersed for 90 d, the unconfined compressive strength value of G-2 is 7.13 MPa, and its strength retention coefficient is 86.6%. The N-A-S-H gel formed by the polymerization in the geopolymer contributes to hindering the intrusion of sulfate ions, thereby improving the sulfate resistance of stabilized soil. The research results can provide a reference for technology that stabilizes soil with industrial waste in sulfate erosion areas.

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Microstructural evolution of asphalt induced by chloride salt erosion

Cited by 30 publications

References 61 publications

Investigations on Adhesion Characteristics between High-Content Rubberized Asphalt and Aggregates

Investigations on Adhesion Characteristics between High-Content Rubberized Asphalt and Aggregates

Influence of Deicer on Water Stability of Asphalt Mixture under Freeze–Thaw Cycle

Experimental Study on Durability Degradation of Geopolymer-Stabilized Soil under Sulfate Erosion

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