Experimental and statistical exploring for mixed-mode (I&amp;II) fracture behavior of cement emulsified asphalt mortar under freeze–thaw cycles and aging condition

Najjar, Shima; Moghaddam, Abolfazl Mohammadzadeh; Sahaf, Ali; Aliha, M.R.M.

doi:10.1016/j.tafmec.2022.103643

Cited by 19 publications

(7 citation statements)

References 39 publications

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“…After 28 days of curing, the UCS values of modified CAM mixtures, particularly those containing epoxy resin, show comparable or slightly lower strength compared to the control mixture. This strength performance is consistent with the findings of Shima et al [29], who investigated the effects of aging conditions on asphalt emulsion-based mixtures. Related research also reported that while epoxy resin initially slowed down strength development, the long-term strength was similar to or exceeded that of unmodified mixtures.…”

Section: Strength Developmentsupporting

confidence: 92%

Enhancing Railway Track Stabilization with Epoxy Resin and Crumb Rubber Powder-Modified Cement Asphalt Mortar

Lee,

Yun,

2023

Polymers

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This research investigates the quantitative impact of incorporating epoxy resin and crumb rubber powder (CRP) into cement asphalt mortar (CAM) for railway track stabilization. The study reveals significant improvements in various key parameters compared to conventional CAM. The modified CAM exhibits a 12.7% reduction in flow time, indicative of enhanced flowability, and a substantial 62.4% decrease in the mixing stability gap, demonstrating superior mixing stability. Additionally, the modified CAM displays remarkable early-age compressive strength, with increases of up to 15.3% compared to traditional CAM formulations. Importantly, the modified CAM showcases robust resistance to challenging environmental conditions, with only a 6.7% strength reduction after exposure to sulfuric acid, highlighting its acid resistance, and exceptional freeze–thaw resistance, with a mere 1.5% strength reduction after undergoing six cycles. In a mock-up test simulating real-world conditions, the modified CAM effectively prevents ballast layer settlement, underscoring its potential to enhance the durability of railway track infrastructure. These quantitative findings not only endorse the practical feasibility of epoxy resin and CRP-enhanced CAM but also suggest its potential to contribute significantly to railway track longevity, reduce maintenance expenditures, and ensure operational reliability.

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Section: Strength Developmentsupporting

confidence: 92%

Enhancing Railway Track Stabilization with Epoxy Resin and Crumb Rubber Powder-Modified Cement Asphalt Mortar

Lee,

Yun,

2023

Polymers

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“…These two indexes can be determined experimentally using suitable laboratory samples. Review of available works reveals that some test specimens including SCB, [87][88][89][90][91][92][93][94][95][96][97] short and long cracked beams subjected to three-or four-point bending, 57,[98][99][100][101][102][103] center cracked Brazilian disk under diametric compression, 104,105 and the ENDB 52,64,[106][107][108][109][110][111][112][113][114][115][116] are among the common used test samples for investigating mixed modes I and II fracture in asphaltic materials. Among them, the ENDB specimen is the newest developed sample and has some advantages such as ease of manufacturing and testing.…”

Section: Mode I and Mode Ii Fracture Test Configurationsmentioning

confidence: 99%

Comparative cracking resistance‐cost study for the hot mix asphalt (HMA) mixtures made of natural and recycled asphaltic materials

Ghoroghi,

Haghighatpour,

Aliha

et al. 2023

Fatigue Fract Eng Mat Struct

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Cracking performance of control and RAPed hot mix asphalt (HMA) mixtures was studied under low and medium temperatures. The effects of recycled asphalt pavement (RAP) content (0 and 50%), compaction method, and temperature (−20, 0 and +20°C) on KIf and KIIf were investigated. Cracking resistances of both modes showed similar trends. The fracture toughness of RAPed mixture at +20°C was higher than the control mixture. However, at −20°C, KIf and KIIf obtained from the RAPed mixture were about 22% lower than control mixture. A cost analysis was performed to compare the manufacturing costs of both mixtures. Accordingly, the cost of HMA mixture containing 50% RAP was 26% less than the control mixture. The proposed life‐cost index in the RAPed mixture was 10, 25, and 100% greater than the control mixture at −20, 0, and +20°C, respectively. Temperature and RAP content had the most important impacts on fracture toughness and cost, respectively.

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“…Currently, there are two main methods for conducting freeze-thaw cycling tests on cementitious materials: rapid freezing and slow freezing [22,23]. The rapid freezing method uses a "water freezing and thawing" process, where the test samples are submerged in water during the entire testing process to simulate freeze-thaw cycles through ice formation and melting [5]. The slow freezing method uses an "air freezing and thawing" process, where the samples are exposed to both air and water during the testing process and freeze in the air before melting in water to simulate freeze-thaw cycles [24][25][26].…”

Section: Freeze-thaw Cycling Testmentioning

confidence: 99%

“…The frost resistance of cement-based grouting materials is an important aspect of performance evaluation, and in recent years, many scholars have focused on research at low or ultra-low temperatures [4][5][6], as shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Study on Anchoring Characteristics and Freeze–Thaw Degradation Law of the Cement-Based Early-Strength Anchor in Freeze–Thaw Regions

2023

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This article focuses on the effect of freeze–thaw cycling on a cement-based early-strength anchor material, the compressive strength of which at 24 h is 14 times that of ordinary cement, and the compressive strength at 7 h is twice that of ordinary cement. The setting time required to achieve the expected strength is 1/7 of that of ordinary cement. Through indoor freeze–thaw cycling tests, the appearance changes, quality loss, strength loss, and microstructure changes in the early-strength anchor after 0, 5, 15, 25, 50, 75, and 100 cycles were studied, revealing the evolution of the mechanical properties and micromechanisms of the cement-based early-strength anchor material under freeze–thaw cycling conditions. The sample freeze–thaw failure criteria were determined, evaluation indicators reflecting the degree of damage were defined, and their relationships with the number of freeze–thaw cycles were fitted to assess the durability of the cement-based early-strength anchor material under freeze–thaw environments. This provides a theoretical reference for further improvements in material properties and adaption to different environments.

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Experimental and statistical exploring for mixed-mode (I&II) fracture behavior of cement emulsified asphalt mortar under freeze–thaw cycles and aging condition

Cited by 19 publications

References 39 publications

Enhancing Railway Track Stabilization with Epoxy Resin and Crumb Rubber Powder-Modified Cement Asphalt Mortar

Enhancing Railway Track Stabilization with Epoxy Resin and Crumb Rubber Powder-Modified Cement Asphalt Mortar

Comparative cracking resistance‐cost study for the hot mix asphalt (HMA) mixtures made of natural and recycled asphaltic materials

Study on Anchoring Characteristics and Freeze–Thaw Degradation Law of the Cement-Based Early-Strength Anchor in Freeze–Thaw Regions

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