Recycling of RAP and steel slag aggregates into the warm mix asphalt: A performance evaluation

Fakhri, Mansour; Ahmadi, Amin

doi:10.1016/j.conbuildmat.2017.04.117

Cited by 74 publications

(19 citation statements)

References 33 publications

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“…Other studies, however, found greater stiffness and related those results to better interlock of SSA in comparison with natural aggregates (19,21). Fakhri and Ahmadi (18) stated that the effect of adhesion between binder and aggregates on the resilient modulus could be more important than interlock of aggregates. Since the samples in this study were tested at intermediate temperature (25°C), there might be a synergistic effect of adhesion and particle interlock, with some small negative outcomes due to adhesion but positive results due to better aggregate interlock.…”

Section: Resultsmentioning

confidence: 99%

“…In the past, several studies have verified the possibility of adding steel slag aggregate in paving applications ( 2 – 13 ). More recently, research efforts have been ongoing to verify the effects of steel slag as aggregate in different types of asphalt mixtures, such as conventional, warm, and/or stone mastic asphalt ( 14 – 22 ). Most studies report that steel slag aggregates (SSA) present favorable frictional properties, high stability, and good durability, with resistance to stripping and rutting, however, the heterogeneity and expansive characteristics of SSA are still the major issues that limit their use in paving applications.…”

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confidence: 99%

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Expansion Level of Steel Slag Aggregate Effects on Both Material Properties and Asphalt Mixture Performance

Teixeira

Schumacher

Pires

et al. 2019

Transportation Research Record: Journal of the Transportation R

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The influence of steel slag expansion level on the early stage performance of hot mix asphalt (HMA) is evaluated. Initially, samples of Linz-Donawitz type steel slag with different levels of expansion (6.71%, 3.16%, 1.33%) were submitted to physical, mechanical, and morphological characterization to assess the effects of expansion on individual material properties. Steel slag was then used as aggregate in HMA to verify the effects of its expansion characteristics on the volumetric and mechanical performance of the asphalt mixture. Four different asphalt mixtures were designed based on Marshall mix design, using asphalt cement (pen. grade 50/70), natural aggregate (granite), and steel slag (in three different levels of expansion). The mechanical characteristics of the asphalt mixture were evaluated based on results from Marshall stability, indirect tensile strength, and resilient modulus testing. A modified Pennsylvania testing method (PTM) was also performed on the studied asphalt mixtures to verify the potential of asphalt binder film to minimize the expansive reactions of steel slag. It was observed that the level of steel slag expansion changes some of the material’s individual properties, which can affect the volumetric parameters of the mix design. The use of steel slag as aggregate in HMA also improves the mechanical properties of non-aged asphalt mixtures. Moreover, the expansive characteristics of this material could be minimized when combined with other asphalt mixture components.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Expansion Level of Steel Slag Aggregate Effects on Both Material Properties and Asphalt Mixture Performance

Teixeira

Schumacher

Pires

et al. 2019

Transportation Research Record: Journal of the Transportation R

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show abstract

“…Studies have also been conducted on the application of steel slag in asphalt mixtures. The results of this research have shown that the use of steel slag could increase the strength of the mixture against moisture sensitivity [14][15], resistance to fatigue cracking [16], permanent deformation [15], and resistance to rutting and dynamic creep [17].…”

Section: Introductionmentioning

confidence: 89%

Influences of Surface Characteristics and Modified Asphalt Binders on Interface Shear Strength

Shafabakhsh

Ahmadi

2019

IJE

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Weak bonding between layers of pavement leads to damages on the composite pavement. Bonding plays an important role in the durability and maintenance of composite pavement layers. The present study evaluates the factors effective in bond strength of the interface between concrete and asphalt pavements. The factors considered for this purpose include steel slag percentage in the concrete pavement, different types of modified bitumen, and rates of tack-coat. To measure the bond properties, direct shear and shear fatigue tests were carried out. In addition, texture depth and abrasion resistance were used in accordance with EN 1338 standard to measure the roughness properties of concrete pavement. The test results showed that 50% replacement of steel slag with aggregate resulted in an increase in physical properties and texture depth of concrete pavement. Moreover, the results of the shear strength test of composite pavement revealed that the optimal rate of using tack-coat varies between 0.6 and 0.9 l/m 2 and depends on the type of tack-coat. Finally, a higher shear strength was obtained for crumb rubber bitumen containing hydrated lime compared to crumb rubber modified bitumen and control bitumen.

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“…Atualmente, diversas medidas e estudos experimentais estão sendo realizados para sua redução, assim como sua aplicação em material cerâmico, descoberta por KLEPAet al [1], com potenciais características, tanto para absorção quanto para reflexão de energia e excelente para refletir o calor. O resíduo da construção pode ser útil também como reuso na terraplanagem de estradas e na compactação de solos em diversos tipos de construções [2,3].…”

Section: Introductionunclassified

Economic viability of a thermal blanket produced from asphalt waste used in roof covering

et al. 2019

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RESUMO Este trabalho apresenta os resultados obtidos em um projeto de construção civil, no qual se dimensiona a isolação térmica do telhado de uma pousada na região de São Joaquim, SC, considerada uma das regiões mais frias do Brasil. Propôs-se o uso de um isolante produzido à base de asfalto reciclado, apontando sua eficiência de isolação térmica e viabilidade econômica com relação aos isolantes comumente usados pela construção civil brasileira. Os resultados obtidos demonstraram que a manta de asfalto reciclado reduz a perda de calor do telhado entre 68 e 72% e o seu custo com material é de duas a cinco vezes menor que as demais mantas estudadas. Além disso, o material do qual o produto é feito é mais ecológico do que as demais mantas térmicas. Assim, este projeto mostrou que o uso da manta de asfalto reciclado é viável economicamente, além de ser muito mais eficiente do que as mantas comercializadas atualmente no Brasil.

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Recycling of RAP and steel slag aggregates into the warm mix asphalt: A performance evaluation

Cited by 74 publications

References 33 publications

Expansion Level of Steel Slag Aggregate Effects on Both Material Properties and Asphalt Mixture Performance

Expansion Level of Steel Slag Aggregate Effects on Both Material Properties and Asphalt Mixture Performance

Influences of Surface Characteristics and Modified Asphalt Binders on Interface Shear Strength

Economic viability of a thermal blanket produced from asphalt waste used in roof covering

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