Geotechnical Properties of Blends of Recycled Clay Masonry and Recycled Concrete Aggregates in Unbound Pavement Construction

Azam, Abdelhalim; Cameron, D. A.

doi:10.1061/(asce)mt.1943-5533.0000634

Cited by 79 publications

(23 citation statements)

References 22 publications

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“…The air jig is assembled by different parallelepipedic boxes (without bottom) one over the other (seeFigure 3), where particles are stratified during the tests. The dimension of each box is 500 x 500 x 50 mm3 .…”

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confidence: 99%

The potential of using air jigging to sort recycled aggregates

Cazacliu

Sampaio

Miltzarek

et al. 2014

Journal of Cleaner Production

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The recycling of inert construction and demolition materials (C&D) remains problematic if these materials are used to process high-quality recycled aggregates suitable for manufacturing new concrete. Even when selective demolition is employed, the crushing and classification of C&D produces recycled aggregates with an unacceptable level of impurities, with the content of gypsum being the biggest concern. Another concern is the percentage of brick content that decreases the density of the recycled aggregate as well as its homogeneity. The present work studies an air-jig sorting method to separate out concrete particles from a C&D mixture that contains high amount of gypsum (22% mass) and brick (24% mass) particles. The mixture of aggregates studied had a 4 to 20 mm grading. After sorting, the bottom third of the mixture had less than 1% mass of gypsum and more than 90% mass of concrete particles. In contrast, the upper third of the sorted material contained gypsum in proportion of nearly 80% mass. The separation mechanism appears to be governed by both particle density and bulk density of individual components. These results are very encouraging and prove that the air-jigging method is a promising technology for the use in C&D recycling plants. Further research is warranted. Highlights Sorting the recycled aggregates (RA) may improve the quality of this material. Air jig prospective test on RA provided better results than previous wet jig tests. RA resulting from the jigging are of suitable quality to be used for secondary concrete. Both particle density and bulk density govern the separation process.

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confidence: 99%

The potential of using air jigging to sort recycled aggregates

Cazacliu

Sampaio

Miltzarek

et al. 2014

Journal of Cleaner Production

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“…Whatman No 1 filter papers were used. More details about the application of the filter paper method are available in Azam and Cameron (2013a). The hanging water column technique was used to condition samples to matric suctions less than 10 kPa (refer ASTM D 6836 2003).…”

Section: Methodsmentioning

confidence: 99%

“…Arulrajah et al, 2012, Gabr et al, Page 2 2013, Gabr and Cameron, 2012, Azam and Cameron, 2013a, Azam and Cameron, 2013b, Jitsangiam et al, 2009.…”

Section: Introductionmentioning

confidence: 99%

Matric Suction in Recycled Unbound Granular Materials

Azam¹,

Cameron²,

Gabr³

et al. 2014

Geo-Congress 2014 Technical Papers

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The matric suction within unbound granular materials (UGMs) can be small when compared with cohesive soil, however suction can influence the engineering behavior of UGMs. Unfortunately, there are few studies on the potential matric suction in UGMs. This paper presents matric suctions for seven recycled products and one virgin aggregate. The products were recycled concrete aggregate (RCA) and recycled clay masonry blended with RCA. The percentage of masonry in the blended materials varied between 10% and 30% by mass. Soil water characteristic curves (SWCC) were established for each material by preparing samples at various moisture contents and measuring matric suction with filter papers in contact with the soil. In order to define the wet end of the SWCC, further samples were conditioned on a tension plate using a hanging water column. The recycled products had suctions higher than the virgin aggregate at an equivalent moisture state. Air entry values and residual suctions were determined for each material. Three published models were applied to fit SWCCs to the experimental data. Generally these models provided good fits to the data for each UGM. The influence of matric suction on both resilient modulus and permanent strain of the recycled materials are presented.

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“…Statik yöntem, dinamik yönteme kıyasla daha hızlı, daha basit ve kolay olduğundan son yıllarda daha yaygın bir numune hazırlama yöntemi olmaya başlamıştır (Azam & Cameron, 2013).…”

Section: Introductionunclassified

Kompaksi̇yon Yöntemi̇ni̇n Kohezyonlu Zemi̇nleri̇n Serbest Basinç Mukavemeti̇ne Etki̇si̇

Akan¹,

Keskin²

2018

Mühendislik Bilimleri Ve Tasarım Dergisi

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Geoteknik yapılarının tasarımı esnasında en önemli parametrelerden biri zeminlerin kayma mukavemeti değeridir. Bu değeri belirlemek için laboratuvarda en yaygın kullanılan deney serbest basınç deneyidir. Laboratuvarda numuneler hazırlanırken ve arazide iyileştirme çalışması olarak zeminlere kompaksiyon uygulanmaktadır ve uygulanan kompaksiyon yöntemini zeminlerin kayma mukavemetini etkilemektedir. Bu çalışmada statik ve dinamik enerji uygulanarak hazırlanan kil numunelerinin serbest basınç dayanımları incelenmiştir. Sonuçlar göstermiştir ki, plastik limit su muhtevasında hem statik hem de dinamik olarak sıkıştırılan numuneler birbirine yakın serbest basınç dayanımlarına sahiptirler ancak su muhtevası plastik limit değerinden ıslak ya da kuru tarafa ilerledikçe statik ve dinamik olarak sıkıştırılan numunelerin serbest basınç değerleri birbirlerinden uzaklaşmaktadır.

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Geotechnical Properties of Blends of Recycled Clay Masonry and Recycled Concrete Aggregates in Unbound Pavement Construction

Cited by 79 publications

References 22 publications

The potential of using air jigging to sort recycled aggregates

The potential of using air jigging to sort recycled aggregates

Matric Suction in Recycled Unbound Granular Materials

Kompaksi̇yon Yöntemi̇ni̇n Kohezyonlu Zemi̇nleri̇n Serbest Basinç Mukavemeti̇ne Etki̇si̇

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