Industrial Waste Materials as Alternative Fillers in Asphalt Mixtures

Dimulescu, Catalina; Burlacu, Adrian

doi:10.3390/su13148068

Cited by 21 publications

(9 citation statements)

References 45 publications

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“…The layers of road structures at their upper level, asphalt pavement, deteriorate and deform progressively due to the exceeding of the strength of the used materials and the bearing capacity under heavy traffic. Therefore, technologies to save and re-use existing resources are more sought after than ever [1].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the cold recycling asphalt pavements method from Romania

Forton,

Stirb,

Marc

2024

MATEC Web Conf.

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The present paper presents a documentation on the realization of the dosages from recycled mixtures, highlighting the change in the test methods regarding the composition and the determination of the physical-mechanical characteristics according to the latest technical regulations. Practically, the structure of the new norm for cold recycled road materials aligns with the new European requirements in accordance with the provisions that the mixtures must meet, but still the problem remains on how to prepare the samples in the laboratory and determine the value of the stiffness modulus of the considered mixture, value which practically in the norm is considered based on good practice. Determining the real value of the stiffness modulus is a decisive factor in the dimensioning of the road structure reinforcement because it can considerably influence the thickness of the layers that make up the resistance structure. Therefore, the paper presents a study on the new methods of making samples in the laboratory and values of the stiffness modulus taken into account when dimensioning the reinforcement of road structures according to the composition of the considered materials.

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Section: Introductionmentioning

confidence: 99%

Analysis of the cold recycling asphalt pavements method from Romania

Forton,

Stirb,

Marc

2024

MATEC Web Conf.

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“…These byproducts from the steel industry can be used in road concrete mixes, but require proper evaluation to ensure that their properties do not adversely affect fresh and hardened concrete [55]. Applying reusable artificial materials and new technologies will positively impact on the environment by protecting non-renewable materials and reducing production costs [56,57].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Blast Furnace Slag on Cement Concrete Road by Microstructure Characterization and Assessment of Physical-Mechanical Resistances at 150/480 Days

et al. 2023

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The results presented in this paper on the appropriateness of using of blast furnace slag (BFS) in the composition of roads make an original contribution to the development of sustainable materials with the aim to reduce the carbon footprint and the consumption of natural resources. The novelty of this work consists of determining the optimal percentage of BSF in road concrete, in order to: increase mechanical resistances, reduce contractions in the hardening process, and ensure increased corrosion resistances, even superior to classic cement-based mixtures. Thus, the physical-mechanical characteristics and the microstructure of some road concretes were studied in the laboratory for three different recipes. We kept the same amount of ground granulated blast furnace slag (GGBS) as a substitute for Portland cement, respectively three percentages of 20%, 40%, 60% air-cooled blast furnace slag (ACBFS) and crushed as sand substitute from now on called S54/20, S54/40, S54/60. Drying shrinkage, mechanical resistances, carbonation-induced corrosion, microstructure characterization of hardened concretes, and degree of crystallinity by SEM and XRD measurements were analyzed after a longer curing period of 150/480 days. The obtained results on the three BSF mixtures indicated a reduction of drying shrinkage and implicitly increased the tensile resistance by bending to 150 days well above the level of the blank composition. The degree of crystallinity and the content of the majority phases of the mineralogical compounds, albites, quartz, and tobermorite out of the three BSF samples justifies the increase in the compressive strengths at the age of 480 days in comparison with the test samples. Scanning electron microscope (SEM) and X-ray diffraction measurements showed the highest compactness and lowest portlandite crystal content for the S54/20 slag composite. Future research concerns are the realization of experimental sections in situ, the study of the influence of BFS on the elasticity module of road concrete, and the opportunity to use other green materials that can contribute to the reduction of the carbon footprint, keeping the physical and mechanical properties of road concrete at a high level.

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“…The uncontrolled consumption of natural resources may have led to the climate and economic changes we are already facing, which are the result of the still-existing linear economies in certain areas of the world [4]. The increasingly large volume of waste in landfills, the lack of storage space, and the stringent reduction of non-renewable natural resources are strong motivations for researchers to mobilize and support recyclers in finding innovative ways to use recycled waste as raw materials in new concrete mixes, which represents one of the most eco-friendly options [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Eco-Innovative Concrete for Infrastructure Obtained with Alternative Aggregates and a Supplementary Cementitious Material (SCM)

Corbu,

Puskas,

Dragomir

et al. 2023

Coatings

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Concrete is a heterogeneous material, one of the most widely used materials on the planet, and a major consumer of natural resources. Its carbon emissions are largely due to the extensive use of cement in its composition, which contributes to 7% of global CO2 emissions. Extraction and processing of aggregates is another source of CO2 emissions. Many countries have succeeded in moving from a linear economy to a circular economy by partially or fully replacing non-renewable natural materials with alternatives from waste recycling. One such alternative consists of partially replacing cement with supplementary cementitious materials (SCMs) in concrete mixes. Thus, this work is based on the experimental investigation of the fresh and hardened properties of road concrete in which crushed river aggregates were replaced with recycled waste aggregates of uncontaminated concrete. At the same time, partial replacement of cement with a SCM material in the form of glass powder improved the durability characteristics of this sustainable concrete. The microstructure and compositional features of the selected optimum mix have also been investigated using polarized light optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction by the Powder method (PXRD) for the qualitative analysis of crystalline constitutive materials.

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Industrial Waste Materials as Alternative Fillers in Asphalt Mixtures

Cited by 21 publications

References 45 publications

Analysis of the cold recycling asphalt pavements method from Romania

Analysis of the cold recycling asphalt pavements method from Romania

The Influence of Blast Furnace Slag on Cement Concrete Road by Microstructure Characterization and Assessment of Physical-Mechanical Resistances at 150/480 Days

Eco-Innovative Concrete for Infrastructure Obtained with Alternative Aggregates and a Supplementary Cementitious Material (SCM)

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