Assessment of Toughness Performance of Recycled Aggregates for Use in Highway Pavement

Ayan, Vahid; Azadani, Seyed Masoud Nasr; Omer, Joshua R.; Limbachiya, Mukesh

doi:10.1061/9780784413005.108

Cited by 3 publications

(6 citation statements)

References 6 publications

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“…It is likely that the porous layer described above, in addition to residual unhydrated cement, lead to an increase in the water absorption rate of RCA [1]. As the density of cement mortar (around 1.0 -1.6 Mg/ m 3 ) [14] is less than that of stone particles of about 2.60 September 2014 | Vol ume 1 | e605 Mg/m 3 , the smaller the particle density, the higher the cement mortar content adhering to the RCA.…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…The reason for the particle densities being lower in RCA as compared to NA is due to the relatively high porosity and low density of the cement paste adhering to the RCA particles. High porosity between the RCA part icles would be filled with void or cement instead of denseportions [1].…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…In one hand, it seems that adding 50% RAP to RCA decreases the water absorption rate and makes it suitable for subbase applications. But, on the other hand our further researches [1] showed that this replacement decreased the strength property of subbase such as CBR values. This is why, it is needed an optimu m mix design of RAP and RCA both decrease the water absorption and increase strength and durability.…”

Section: Conclusion and Recommendationsmentioning

confidence: 99%

“…In another research by author [1] performed tests on RCA such as durability and strength tests showed that the higher water absorption can directly influence these properties. Durability test like soundness of subbase aggregates by use of sodium/magnesiu m sulphate and strength tests like co mpaction and California Bearing Ratio (CBR) are very significant requirements in construction of base and subbase layer of h ighways.…”

Section: Conclusion and Recommendationsmentioning

confidence: 99%

“…RA and RCA are subjects of debate in so far as applicat ion in road bases and subbases are concerned. Evaluat ion showed that RCA and RA fro m different sou rces have different mechanical properties based on their origin [1].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Water Absorption Study Recycled Aggregates for Use Pavement Material

Ayan¹,

Omer²,

Azadani³

et al. 2014

OALib

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Water absorption properties of recycled materials play an important role in pavement performance. The performance of aggregates changes after absorbing water, then it affects highways layers such as base, subbase, capping. This is why these materials must comply requirements of codes and standards. With regard to the increasing trend of application of recycled aggregates in highways layers, this issue needs more investigation. This research is only a part of our large research programm e on three different purposed mixes of unb ound subbase m ixture b elow: 1) 100% Recycled Concrete Aggregate (R CA); 2) 100% Lime Stone (NA); 3) 50% RCA + 50% Reclaimed Asphalt Pavement (R AP). Water absorption for each mix has been performed in different size fraction with pyknometer and wire basket methods. The relationship between density, gra ding and water absorption and its comparison for mixes would be indicating the changes in beha viour of aggregates and future performance of subbase. Laboratory testing showed that 100% Lime Stone had the higher densities than other mixes and water absorption value of 100% RCA was about 40% higher than 50% RCA + 50% RAP in 31.5 mm -4 mm fraction.

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Section: Test Results and Discussionmentioning

confidence: 99%

Section: Test Results and Discussionmentioning

confidence: 99%

Section: Conclusion and Recommendationsmentioning

confidence: 99%

Section: Conclusion and Recommendationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Water Absorption Study Recycled Aggregates for Use Pavement Material

Ayan¹,

Omer²,

Azadani³

et al. 2014

OALib

View full text Add to dashboard Cite

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Study and Analysis of Characteristics of Construction and Demolition Waste in Highway Pavements

Jain

Goyal

2019

Lecture Notes in Civil Engineering

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Using Recycled Aggregates from Construction and Demolition Waste in Unbound Layers of Pavements

et al. 2020

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Pavements are an expensive part of transportation infrastructures, as their construction and maintenance require large amounts of resources and materials every year and all over the world. A sustainable solution for considering environmental concerns about roads and pavements, in general, is utilizing recycled materials for their construction. This has been shown to lower the carbon footprint of the construction sector and to result in natural resource conservation, in reduction of harmful emissions and in minimization of overall costs for pavement construction and maintenance. One of the main groups of recycled materials which has attracted much attention since the end of the last century is construction and demolition waste aggregates (CDW). This paper reviews the completed studies referring to the use of the construction and demolition waste aggregates in unbound layers of pavements and compare the in-hand results from various engineering assessments of these aggregates and mixes. A number of tests and evaluations are applied in order to enhance the required quality and durability of the pavements under given traffic volumes traffic loads and climate actions. Today, unbound recycled aggregates (RA) are mainly used in the lower layers, such as subgrade, capping, sub-base and base, but in rural roads they can be adopted also for bound layers, towards the surface of the structure and may be constituents of bound layers and of novel surfacing applications.

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Assessment of Toughness Performance of Recycled Aggregates for Use in Highway Pavement

Cited by 3 publications

References 6 publications

Water Absorption Study Recycled Aggregates for Use Pavement Material

Water Absorption Study Recycled Aggregates for Use Pavement Material

Study and Analysis of Characteristics of Construction and Demolition Waste in Highway Pavements

Using Recycled Aggregates from Construction and Demolition Waste in Unbound Layers of Pavements

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