Assessment of reclaimed asphalt pavement (RAP) as recycled aggregate for concrete

Masi, Giulia; Michelacci, Alessandra; Manzi, Stefania; Bignozzi, Maria

doi:10.1016/j.conbuildmat.2022.127745

Cited by 11 publications

(4 citation statements)

References 51 publications

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“…Roesler et al [ 28 ] fractionated the RAP aggregates on a 4.75 mm sieve to separate coarse and finer fractions whereas Zhu et al [ 52 ] considered 2.36 mm sieve passing as fine RAP recycled aggregates from the characterization technique. Masi et al [ 53 ] characterized the RAP recycled aggregate as having greater than 4 mm as coarse RAP (CR) fraction and less than the same size as fine RAP (FR). A fine aggregate to be used in the production of cement concrete mixes should contain a minimum of 35% finer fraction passing through 600 microns IS sieve for gradation perspective [ 54 ].…”

Section: Physical Characterization Of Rapmentioning

confidence: 99%

Feasibility Study of Reclaimed Asphalt Pavements (RAP) as Recycled Aggregates Used in Rigid Pavement Construction

et al. 2023

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Reclaimed Asphalt Pavement (RAP) as recycled aggregates is a relatively new construction process of rigid pavements due to the scarcity and degradation of natural aggregates. This study aims at the sequential characterization of RAP aggregate to obtain optimized proportions for strength. For this purpose, RAP aggregates were used for the replacement of natural aggregates (NA) in the concrete mix which was achieved by varying from 0–100%. Furthermore, zirconia silica fume (ZSF) was used as a partial replacement of the cement in the concrete mix, replacing Ordinary Portland Cement (OPC). Experimental studies have shown that the incorporation of washed RAP (WRAP) slightly reduces the compressive strength of concrete by 2.7–37.35% as compared to the reference control concrete mix. Although the 7-days, 28-days and 56-day compressive strength of WRAP recycled aggregate-based concrete is slightly better than the 7-days, 28-days and 56-day compressive strength of dirty RAP (DRAP) recycled aggregate-based concrete. A similar trend was observed in the flexural strength and split tensile strength of WRAP recycled aggregate-based. Overall, the results show that 40% WRAP recycled aggregates with 10% ZSF as a replacement for cement outperform DRAP aggregates in concrete mixes. According to the ANOVA results, the combination of ZSF and WRAP aggregates met the cement concrete pavement strength standard, thereby contributing to sustainable development. Reclaimed Asphalt Concrete Pavements (RACP) are now seen as a potential and long-term answer to the present environmental and economic crisis.

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Section: Physical Characterization Of Rapmentioning

confidence: 99%

Feasibility Study of Reclaimed Asphalt Pavements (RAP) as Recycled Aggregates Used in Rigid Pavement Construction

et al. 2023

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“…However, since road maintenance interventions occur more frequently than new road construction and complete recycling is not permitted, there is a surplus of RAP in developed countries, creating great amounts of readily available material that can potentially be reused [18]. This is important in Italy, which has the second-highest quantity of available RAP in the EU (9.5 Mt) [21], yet only 20% of that material is reused [19] due to regulatory limits, which, depending on the bitumen type, allow only a maximum of 30%, 25%, and 15% of RAP to be used in bases, base-binders and binders, and wear courses, respectively [22][23][24]. Finding another way to employ RAP can help valorize valuable waste that otherwise will be lost.…”

Section: Introductionmentioning

confidence: 99%

“…In general, the slump of RAP concrete was lower than the control mix [31], and the mixes containing 100% RAP resulted in high stiffness [32]; however, for reduced RAP content, the admixtures reached the same class as control concrete [32], and in some cases, even registered a slump increase [33]. The air content experimented with This is important in Italy, which has the second-highest quantity of available RAP in the EU (9.5 Mt) [21], yet only 20% of that material is reused [19] due to regulatory limits, which, depending on the bitumen type, allow only a maximum of 30%, 25%, and 15% of RAP to be used in bases, base-binders and binders, and wear courses, respectively [22][23][24]. Finding another way to employ RAP can help valorize valuable waste that otherwise will be lost.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the fine aggregate particles were fully incorporated within the asphalt matrix, and the presence of micro filler and agglomerated dust films on the surface of coarse RAP was observed, which were responsible for increased water absorption and limited strength properties [32,42]. In addition, the bituminous layer was responsible for RAP concrete's hydrophobic behavior [22].…”

Section: Introductionmentioning

confidence: 99%

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Economical Assessment of Recycled Asphalt Pavement (RAP) Aggregate for Structural Concrete Production in Italy

Peduzzi,

Franco,

De Luca

et al. 2023

Buildings

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Structural concrete aggregate can be substituted with sustainable alternatives from construction and demolition waste, such as reclaimed asphalt pavement (RAP). This contribution assesses the RAP aggregate production chain and aims to investigate the economic aspect of RAP aggregate, evaluating the costs associated with its production and comparing them with the ones necessary to produce NA and recycled concrete aggregate (RCA). This analysis aims to provide additional information on the possible advantages of RAP aggregate use in order to promote sustainable construction. The evaluation was developed using a four-step methodology consisting of (i) determining the RAP aggregate production procedure; (ii) selecting a case study; (iii) defining the mix design; and (iv) performing a cost evaluation and comparing it to the cost of NA and RCA production. The results of the cost analysis of three concretes containing different RAP percentages (0%, 30%, and 45%) demonstrated that RAP’s presence led to more expensive admixtures, with the RAP unit cost being higher than NA (+155.39%). Some strategies were proposed to diminish RAP’s cost, resulting in a reduction of −39.64% with respect to NA’s cost and ranging from 45.13% to 67.30% when compared to RCA’s cost.

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The Challenge of Replacing Natural Aggregate with Artificial Aggregate for Structural Concrete

Russo

Lollini

2023

Lecture Notes in Civil Engineering

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Assessment of reclaimed asphalt pavement (RAP) as recycled aggregate for concrete

Cited by 11 publications

References 51 publications

Feasibility Study of Reclaimed Asphalt Pavements (RAP) as Recycled Aggregates Used in Rigid Pavement Construction

Feasibility Study of Reclaimed Asphalt Pavements (RAP) as Recycled Aggregates Used in Rigid Pavement Construction

Economical Assessment of Recycled Asphalt Pavement (RAP) Aggregate for Structural Concrete Production in Italy

The Challenge of Replacing Natural Aggregate with Artificial Aggregate for Structural Concrete

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