Resilient Modulus of Recycled Aggregates Obtained by Means of Dynamic Tests in a Triaxial Apparatus

Cerni, Gianluca; Colagrande, S.

doi:10.1016/j.sbspro.2012.09.898

Cited by 14 publications

(4 citation statements)

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“…Shape index is rarely studied in CDW recycling. As an example, Cerni and Colagrande have found a value of 28% as shape index for CDW aggregates [31]. Cardoso et al declared that, independent of the volume decreasing of previous mortar, two or more crushing stages typically lead to rounder and less sharp particles; if RCA only applied an initial crushing process, they will usually show higher shape and flakiness indexes than natural aggregates [16].…”

Section: Flakiness and Shape Indexesmentioning

confidence: 99%

“…Moreover, the same authors demonstrated that the CDW-RA mixture, even characterized by the presence of minor amounts of binding agents which add cohesive properties to it (such as lime), presented a resilient behavior very close to a common frictional material like a virgin quarry aggregate mixture. The characteristic which proposed such a similarity is low susceptibility to water [31]. Azam and Cameron demonstrated that adding recycled masonry aggregates to recycled concrete aggregates will decrease their resilient modulus and increase the permanent strain of the mixes under triaxial repeated test.…”

Section: Resilient Modulusmentioning

confidence: 99%

“…Particle size distribution curves of CDW recycled aggregates from previous researches[24,[28][29][30][31][32][33][34][35].…”

mentioning

confidence: 99%

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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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Section: Flakiness and Shape Indexesmentioning

confidence: 99%

Section: Resilient Modulusmentioning

confidence: 99%

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

et al. 2020

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“…Results from modified Proctor tests showed values of OMC from 8.0% for RAP to 11.2% for CB, and indicated that WR had the highest ρd,max while FRG had the lowest one. Bennert et al (2000), Molenaar and Niekerk (2002), Gabr and Cameron (2011), and Cerni and Colagrande (2012) used the resilient modulus test to estimate the stiffness of CDW. Results demonstrated that CDW performs similarly to and sometimes better than virgin unbound granular materials.…”

Section: Introductionmentioning

confidence: 99%

Short-Term and Long-Term Effects of Cement Kiln Dust Stabilization of Construction and Demolition Waste

Bassani

Riviera

Tefa

2017

J. Mater. Civ. Eng.

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High volumes of construction and demolition waste (CDW) are continuously produced worldwide.The European Commission aims to increase the recycling of non-hazardous CDW to a minimum of 70% in weight terms by 2020. Hence, there is increasing pressure on researchers to focus on the valorization of these alternative materials for use in the world of construction alongside traditional materials.CDW contains materials from excavation and/or demolition and are typically heterogeneous in terms of composition, grain size, and toughness; furthermore, some particles are more sensitive to degradation processes than others. One solution for an increase in durability while maintaining sufficient strength levels is chemical stabilization with cementitious binders.The paper illustrates the results of a laboratory investigation into the properties of CDW when subject to stabilization with cement kiln dust (CKD). Mixtures of CDW stabilized with ordinary Portland cement (OPC) were prepared for comparison purposes. The results obtained with CKD are encouraging since it increases the strength and stiffness of CDW, thus leading to a material completely made up of recycled wastes and by-products usable in the formation of pavement subbases and subgrades. As regards the curing time, all mixtures saw a significant increase in their mechanical parameters when passing from 7-28 days to 365 days of curing.

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Mechanical Behaviour of Asphalt Concrete Containing C&D Recycled Materials

Bocci¹,

Cerni²,

Colagrande³

2015

RILEM Bookseries

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Recycling of waste materials is actually one of the main targets in civil engineering, because of economic and environmental features. To this aim, the field of road engineering offers many technical solutions, including the use of re-cycled materials from construction and demolition of civil works (C&D) in pave-ment layers. These materials have been investigated to be used as aggregate in as-phalt concrete base layers for flexible road pavements. Different percentages (0%, 15%, 30% e 50%) of C&D materials were used in order to determine the most suitable solution. The scope was to evaluate both static and dynamic mechanical properties of the mixtures. In particular, a servo-hydraulic control static press was used to run indirect tensile tests and a Nottingham Asphalt Tester was used to determine indirect tensile stiffness modulus and fatigue strength. Specimens were manufactured by mixing the aggregate with 5% of bitumen and compacted with a shear gyratory compactor to a fixed height, in order to have a constant air voids content equal to 5%. Experimental results showed that C&D materials can conveniently be used in asphalt concrete for base layers (up to maximum 30%) without penalizing the mechanical performance of the mixture

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Resilient Modulus of Recycled Aggregates Obtained by Means of Dynamic Tests in a Triaxial Apparatus

Cited by 14 publications

References 1 publication

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

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

Short-Term and Long-Term Effects of Cement Kiln Dust Stabilization of Construction and Demolition Waste

Mechanical Behaviour of Asphalt Concrete Containing C&D Recycled Materials

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