Torsional Shear Device for Testing the Dynamic Properties of Recycled Material

Gabryś, Katarzyna; Sas, Wojciech; Soból, Emil; Głuchowski, Andrzej

doi:10.1515/sgem-2016-0027

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…The smallest squares indicate the average value for the measured and calculated damping ratio. It can be seen that the mean measured damping ratio is similar to the calculated by Equations (5), (7), and (8). The mean damping ratio estimated by Equation (9) is slightly below the measured result.…”

Section: The Statistical Reliability Of the Proposed Modelsupporting

confidence: 72%

The New Empirical Equation Describing Damping Phenomenon in Dynamically Loaded Subgrade Cohesive Soils

et al. 2019

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The damping ratio (D) is one of the key soil parameters in geotechnical issues where the soil is subjected to dynamic loads, like machines foundation, city tram and subway traffic, and driving of sheet pile or precast pile. Each of the abovementioned geotechnical problems is connected with significant damping, so its effect should be included in the dynamical analysis. Therefore, this article focuses on the damping phenomenon in cohesive soils from the capital of Poland, which is described by damping ratio (D). In this research, a set of the damping tests by free vibration method in resonant column device were conducted, and the influence of four selected factors, i.e., shear strain (γ), effective stress (p’), plasticity index (PI), and void ratio (e) on damping ratio in wide strain range was investigated and discussed. Based on the laboratory tests, the shear strain has the most impacts on the damping ratio characteristics; the plasticity index and the effective stress also have a significant influence. Based on the performed analysis, the authors propose the empirical equations with two sets of variables, the first for low and medium cohesive soil (PI < 20%) and the second for very cohesive soils (PI > 20%).

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Section: The Statistical Reliability Of the Proposed Modelsupporting

confidence: 72%

The New Empirical Equation Describing Damping Phenomenon in Dynamically Loaded Subgrade Cohesive Soils

et al. 2019

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“…RCA, which is an alternative, granular material used in soil constructions, has a grain size distribution that allows classifying the mixtures as non-cohesive soil. The particle size curve of such materials is characterized by parameters describing the curvature and soil grain size, i.e., C U -coefficient of uniformity and C C -coefficient of curvature [22,23].…”

Section: Physical Properties Analysismentioning

confidence: 99%

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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“…He and Senetakis [19] also obtained a similar value of shear wave velocity. For determination maximum shear modulus, shear modulus degradation curve, and minimal damping ratio of RCA, resonant column apparatus in cyclic torsional shear mode was employed in Gabryś et al [20] article. They obtained maximum shear modulus from 62 MPa at 45 kPa effective stress to 220 MPa at 225 kPa effective stress and minimal damping ratio from 0.5 to about 3%.…”

Section: Introductionmentioning

confidence: 99%

Permeability and Leaching Properties of Recycled Concrete Aggregate as an Emerging Material in Civil Engineering

et al. 2018

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In this article, a study of the threshold gradient and leaching properties for recycled material, namely, recycled concrete aggregate (RCA), was conducted. The RCA in this study is a material that comes from recycling concrete debris. A series of tests in permeameter apparatus in a constant head manner were conducted. The test method has been improved to eliminate common mistakes, which occur when the constant head method is used. During the following study, aggregates with gradations equal to 0–8, 0–16, and 0.05–16 mm were tested. The tests were conducted on gradients ranging from 0.2 to 0.83. This range of tested gradients led to the evaluation of the flux velocity and indicated non-Darcian flow. For engineering applications, the threshold gradients for three RCA blends were calculated using a statistical analysis. The average coefficient of permeability, kavg, for linear flow was equal to 1.02 × 10−4–1.89 × 10−4 m/s. In this paper, suffosion analysis was also conducted for the three blends in order to eliminate the possibility of particle movement. Moreover, for RCA blend 0–16 mm, leaching properties was examined. It was found that the concentration of chlorides, sulphates, and heavy metals in the water solution does not exceed the permissible standards. This paper ends with conclusions and proposals concerning the threshold gradients obtained from the statistical analysis, suffosion analysis, and flux velocity.

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Torsional Shear Device for Testing the Dynamic Properties of Recycled Material

Cited by 7 publications

References 5 publications

The New Empirical Equation Describing Damping Phenomenon in Dynamically Loaded Subgrade Cohesive Soils

The New Empirical Equation Describing Damping Phenomenon in Dynamically Loaded Subgrade Cohesive Soils

Physical, Deformation, and Stiffness Properties of Recycled Concrete Aggregate

Permeability and Leaching Properties of Recycled Concrete Aggregate as an Emerging Material in Civil Engineering

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