Use of Recycled Aggregates Made from Construction and Demolition Waste in Sustainable Road Base Layers

Teijón-López-Zuazo, Evelio; Vega-Zamanillo, Ángel; Calzada-Pérez, Miguel Ángel; Robles-Miguel, Ángel

doi:10.3390/su12166663

Cited by 15 publications

(7 citation statements)

References 5 publications

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“…This fact notwithstanding, large quantities of BOF slag can meet the needs of aggregates for road construction. The use of waste and by-products is one of the most promising techniques for sustainable roads, as it provides a double benefit [16]. On the one hand, it reduces the extraction and production of raw materials, reducing the consumption of water, electricity and diesel, as well as the generation of other diffuse emissions such as noise and dust.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Steel Slag as Aggregate for Road Construction: Experimental Testing and Environmental Impact Assessment

et al. 2021

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Blast Oxygen Furnace (BOF) slag represents one of the largest waste fractions from steelmaking. Therefore, slag valorisation technologies are of high importance regarding the use of slag as a secondary resource, both in the steel sector and in other sectors, such as the construction or cement industries. The main issue regarding the use of BOF slag is its volumetric instability in the presence of water; this hampers its use in sectors and requires a stabilisation pre-treatment. These treatments are also cost-inefficient and cause other environmental issues. This paper analyses the use of untreated BOF slag from a technical and environmental point of view, suggesting it as an alternative to natural aggregates in road surface layers and asphalt pavements. A comprehensive analysis of the requirements to be met by raw materials used in asphalt mixes was performed, and a pilot test was carried out with two different mixtures: one mix with limestone as coarse aggregate and another with 15% BOF slag. Furthermore, the global warming impacts derived from each mix with different aggregates were measured by Life Cycle Analysis (LCA), and a transport sensitivity analysis was also performed. The results show how the utilization of BOF slag as coarse aggregate in road construction improves the technical performance of asphalt mixtures (Marshall Quotient 4.9 vs. 6.6). Moreover, the introduction of BOF slag into the asphalt mix as a coarse aggregate, instead of limestone, causes a carbon emissions reduction rate of more than 14%.

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Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Steel Slag as Aggregate for Road Construction: Experimental Testing and Environmental Impact Assessment

et al. 2021

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“…The development of concrete or pavement by utilizing waste has been carried out by several researchers, especially recycled material waste. Some researchers use the concrete waste from building demolition as a substitute for coarse aggregate as a road pavement layer [6][7][8]. The results of this study indicate that the recycled aggregate can be used as a coarse base or sub-base on road pavements that are passed by light to medium volume vehicles such as residential roads or parking lots.…”

Section: Figure 1 Unused Construction Demolition Wastementioning

confidence: 84%

The development of permeable pavement from demolished construction waste

Ulfiana

Suripin

Wulandari

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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In Indonesia, paving blocks are one of the most extensively used building materials. Paving blocks are ideal for making roads, parks, and parking lots because they are easy to install, durable, and weather-resistant. The high demand for paving blocks contributes to the increasing demand for aggregate as the main material for paving blocks. This has an indirect impact on the environment. On the other hand, building demolition waste is increasing. The majority of these building materials are non-biodegradable, such as concrete, plaster, brick walls, and tiles, which could harm the environment. Therefore, this study aims to see the possibility of using demolished concrete, brick walls, and tiles as a substitute for the aggregate in the production of permeable paving blocks. Each substitute material is then sampled and evaluated with compressive strength and infiltration rate to find the most optimum permeable paving block design. Based on the analysis, permeable paving blocks that use concrete as a substitute for coarse aggregate have better permeability and compressive strength compared to paving blocks that use brick walls and tiles waste. This paving block has an infiltration rate of 858 mm/hour and compressive strength of 11.68 MPa which is suitable for use in the park.

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“…At the same time, to accelerate the sustainable development of resources, there is also a current research hotspot surrounding the crushing and screening of the waste concrete blocks produced by building demolition into recycled aggregates, which are then applied in road engineering [ 18 , 19 , 20 , 21 ]. Teijon et al [ 22 ] and Garach et al [ 23 ] first confirmed the feasibility of recycled aggregate as a road base. Then, Chiranjeevi et al [ 24 ] and Tefa et al [ 25 ] tested the road performance of a cement-stabilized recycled aggregate mixture and found that it had good compressive strength and could be used for low-grade roads.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Mechanism Analysis of Stainless Steel AOD Slag Mixture Base Materials

Huang,

Wei,

Lan

et al. 2024

Materials

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To promote resourceful utilization of argon oxygen decarburization (AOD) slag, this research developed a new three-ash stabilized recycled aggregate with AOD slag, cement, fly ash (FA), and recycled aggregate (RA) as raw materials. The AOD slag was adopted as an equal mass replacement for fly ash. The application of this aggregate in a road base layer was investigated in terms of its mechanical properties and mechanistic analysis. First, based on a cement: FA ratio of 1:4, 20 sets of mixed proportion schemes were designed for four kinds of cement dosage and AOD slag replacement rates (R/%). Through compaction tests and the 7-day unconfined compressive strength test, it was found that a 3% cement dosage met the engineering requirements. Then, the unconfined compressive strength test, indirect tensile strength test, compressive rebound modulus test, and expansion rate test were carried out at different age thresholds. The results showed that the mixture’s strength, modulus, and expansion rate increased initially and then stabilized with age, while the strength and modulus initially increased and then decreased with increasing R. Secondly, based on X-ray diffraction (XRD) and scanning electron microscopy (SEM) used to analyze the mechanism, it was found that the strength, modulus, and expansion rate of the new material can be promoted by blending AOD slag, due to its ability to fully stimulate the hydration reaction and pozzolanic reaction of the binder. Finally, based on the strength and modulus results, R = 3% was identified as the optimal ratio, which provides a reference point for the effective application of AOD slag and RA in road base materials.

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Use of Recycled Aggregates Made from Construction and Demolition Waste in Sustainable Road Base Layers

Cited by 15 publications

References 5 publications

Comprehensive Analysis of Steel Slag as Aggregate for Road Construction: Experimental Testing and Environmental Impact Assessment

Comprehensive Analysis of Steel Slag as Aggregate for Road Construction: Experimental Testing and Environmental Impact Assessment

The development of permeable pavement from demolished construction waste

Preparation and Mechanism Analysis of Stainless Steel AOD Slag Mixture Base Materials

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