Scale Effect in Direct Shear Tests on Recycled Concrete Aggregate

Soból, Emil; Sas, Wojciech; Szymański, Alojzy

doi:10.1515/sgem-2015-0019

Cited by 11 publications

(6 citation statements)

References 10 publications

(10 reference statements)

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“…The maximu max) was equal to 1.94 g/cm 3 and was achieved at the optimum moisture about 9.5%. Very similar results to those are presented here, but for the b 0.05 to 2 mm can be found in Soból et al [33]. Based on the results of com be concluded that the tested RCA is compacted in a similar way to na where a characteristic value of the optimum moisture content is observe non of the strong linkage between wopt with ρd, max, and with the narrow content noticeable in this study is a determinant of coarse-grained soils centage of fine particles content.…”

Section: Physical Properties Resultssupporting

confidence: 92%

Physical, Deformation, and Stiffness Properties of Recycled Concrete Aggregate

2021

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The construction sector is currently struggling with the reuse of waste originating from the demolition and modernization of buildings and roads. Furthermore, old buildings are gradually being replaced by new structures. This brings a significant increase of concrete debris to waste landfills. To prevent this, many studies on the possibilities of recycling concrete, known as recycled concrete aggregate (RCA), have been done. To broaden the applicability of reused concrete, an understanding of its properties and engineering behavior is required. A difficulty in sustainable, proper management of RCA is the shortage of appropriate test results necessary to assess its utility. For this reason, in the present study, the physical, deformation, and stiffness properties of RCA with gravely grain distribution were analyzed carefully in the geotechnical laboratory. To examine the mentioned properties, an extensive experimental program was planned, which included the following studies: granulometric analysis, Proctor and oedometer tests, as well as resonant column tests. The obtained research results show that RCA has lower values of deformation and stiffness parameters than natural aggregates. However, after applying in oedometer apparatus repetitive cycles of loading/unloading/reloading, some significant improvement in the values of the parameters studied was noticed, most likely due to susceptibility to static compaction. Moreover, some critical reduction in the range of linear response of RCA to dynamic loading was observed.

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Section: Physical Properties Resultssupporting

confidence: 92%

Physical, Deformation, and Stiffness Properties of Recycled Concrete Aggregate

2021

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“…First, the internal friction angles of the soils were determined according to ASTM D3080 [26] with the traditional direct shear test method, but using a different-sized shear box (100 x 100 x 40 mm 3 ) [27][28][29][30]. The friction angle of the soil -GM interfaces was determined according to ASTM D5321 [31] using a direct shear apparatus.…”

Section: Methodsmentioning

confidence: 99%

Effects of soil and geomembrane types on interface and shear strength behaviour

2024

JCE

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The interface shear behaviour between the geomembranes and soils was studied. Sand/bentonite (80/20), crushed sand, river sand, crushed gravel, and river gravel were used in this study. Polyvinyl chlorides were cured in the 0.5 molar saltwater and high-density polyethylene was cured in municipal solid waste leachate for eight months. Direct shear experiments were performed using cured GMs. This study recommends the use of crushed gravel in projects that use polyvinyl chloride and high-density polyethylene. The interface friction angles, which were exposed to the effects of saltwater and municipal solid waste leachate, decreased even after eight months, and this reduction effect should be considered in future projects. When designing projects involving GMs exposed to MSW leachate, particularly in landfills, potential damage over time should be considered, and appropriate design parameters should be selected. Failure to do so can lead to disasters that cause the loss of life and property.

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“…The resilient modulus representing the behavior of pavement layers under repeated traffic loads, which is primarily used for determining the structural thickness of the road and evaluating the performance of this structure, was investigated and compared with the results of other studies 66 – 69 . It has also been shown in previous studies that the MR of all samples varies with the total stress as a result of resilient modulus tests; and as has been shown in this study, it is almost linear to the and the MR values 70 , 71 .…”

Section: Experimental Studymentioning

confidence: 99%

The effect of RCA pavements on the liquefaction-induced settlement

Akbaş¹,

Subasi²,

İyisan³

2023

Sci Rep

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The use of recycled concrete aggregates (RCA) not only reduces the demand for natural aggregates (NA) but also might improve the behavior of soil under earthquake loading. In this study, the behavior of the pavement constructed using 100% RCA and NA on a sandy soil layer with high liquefaction potential under dynamic loads was investigated by numerical analysis and compared with free field conditions. For this purpose, first, the classical geotechnical properties of 100% RCA and NA materials were obtained, and then the stiffness properties were determined by resilient modulus and permanent deformation tests. In the second stage, three different models were created with pavement with NA and RCA and without pavement on high liquefaction potential sand, and dynamic analyses were carried out by PM4Sand. Numerical analyses show that constructing a subbase and base layers significantly reduces liquefaction-induced settlement on the surface of flexible pavements built on liquefied soils. Moreover, when the case of using RCA instead of NA in the subbase and base layers built on the liquefied soil is examined, the liquefaction-induced settlement values on the surface are obtained either lower or very close. Consequently, this study proposes a new alternative to the use of RCA waste materials instead of NA. It is expected the use of these waste materials will reduce the need for storage space and also reduce the negative environmental effects associated with storage.

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Scale Effect in Direct Shear Tests on Recycled Concrete Aggregate

Cited by 11 publications

References 10 publications

Physical, Deformation, and Stiffness Properties of Recycled Concrete Aggregate

Physical, Deformation, and Stiffness Properties of Recycled Concrete Aggregate

Effects of soil and geomembrane types on interface and shear strength behaviour

The effect of RCA pavements on the liquefaction-induced settlement

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