Physical, Deformation, and Stiffness Properties of Recycled Concrete Aggregate

Gabryś, Katarzyna; Soból, Emil; Sas, Wojciech

doi:10.3390/su13084245

Cited by 8 publications

(4 citation statements)

References 24 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Repurposing structural components to produce "new" items is difficult. Therefore, researchers are exploring approaches to repurpose recycled concrete including as construction materials e.g., [33][34][35], and geotechnical applications e.g., [36][37][38]. However, consumers may be hesitant to use these materials and applications because the minimum specifications have not been met.…”

Section: Low Demand For Recycled Concretementioning

confidence: 99%

Main Challenges to Concrete Recycling in Practice

et al. 2021

View full text Add to dashboard Cite

While concrete recycling is crucial to protecting the environment, its implementation in practice is low in many countries. This study aims to highlight challenges to concrete recycling. To achieve that aim, the study objectives are (1) to identify the main challenges to concrete recycling in construction projects; (2) to compare the main challenges between small–medium enterprises (SMEs) and large enterprises (LEs); and (3) to determine the underlying groups among the main challenges. Potential challenges were identified through a systematic literature review of journal articles and semi-structured interviews with fifteen industry practitioners. Then, the identified challenges were inserted into a questionnaire survey and distributed to industry practitioners. Eighty-nine valid responses were collected and analyzed using the mean score ranking, normalization, agreement analysis, and factor analysis techniques. The analyses show thirteen main challenges to concrete recycling. The main challenges include increased project duration, lack of national programs, lack of comprehensive rules and regulations, increased project cost, low demand for recycled concrete, low cost-effectiveness of concrete recycling, and increased transportation cost. However, there is no consensus on the criticality between SMEs and LEs. For example, increased project cost is the main challenge for SMEs but is only middlingly ranked for LEs. Finally, the main challenges can be categorized into three interrelated groups: people and technical, legal and environmental, and economic challenges. This study contributes to the literature by analyzing challenges that hinder concrete recycling in practice. The findings allow researchers and practitioners to develop strategies to reduce concrete recycling rejection.

show abstract

Section: Low Demand For Recycled Concretementioning

confidence: 99%

Main Challenges to Concrete Recycling in Practice

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Traces of human activity are often the criterion that shows the anthropogenic origin of geological layers. Due to the many possibilities of anthropogenic soil usage, the research aims and scopes are extremely diverse [20,21]. When it comes to engineering constructions, as with natural or native soils, it is crucial to investigate compaction parameters, as well as the choice of equipment and compaction technology [22], but it is also important to take into account the possible geochemical transitions of built-in soils and the degree of their aggressiveness towards concrete and steel constructions.…”

Section: Figurementioning

confidence: 99%

Evaluation of Anthropogenic Substrate Variability Based on Non-Destructive Testing of Ground Anchors

et al. 2021

View full text Add to dashboard Cite

The purpose of this paper is to describe the variability of soil rheological properties based on research carried out using load tests of ground anchors under complex geotechnical conditions. The heterogeneity of soil should always be considered when designing geotechnical constructions. In the present case, the earthwork created at the Warsaw Slope revealed an embankment of anthropogenic origin, located in a geologically and geomorphologically complex area of the Vistula valley slope. Excavation protection was anchored mainly in soils of anthropogenic origin. When the acceptance tests of the ground anchor were completed, the subsoil randomness was confirmed using nondirect, geostatistical methods. A standard solid rheological model with nonlinear fitting to the data was used. This model was established to describe the creeping activity of the ground anchor more accurately. The characteristics of man-made embankments were described using the parameters obtained with the rheological model of the subsoil.

show abstract

“…The increasingly common use of RCA for road foundations, working platforms, or soft soil improvement (dynamic replacement), among other applications, has forced researchers to determine its dynamic properties in terms of the range of small deformations [ 13 ]. The response of the soil under dynamic loading is strongly controlled by the mechanical properties of the soil, which include parameters such as the small-strain shear stiffness (G max ), the shear modulus (G), and its degradation with increasing shear strain (G/G max = f(γ)), the small-strain damping ratio (D min ), the damping ratio (D), and its variation with the level of strain (D/D min = f(γ)).…”

Section: Introductionmentioning

confidence: 99%

Effect of a Fine Fraction on Dynamic Properties of Recycled Concrete Aggregate as a Special Anthropogenic Soil

et al. 2023

Self Cite

View full text Add to dashboard Cite

The literature confirms that fine recycled concrete aggregate (fRCA) can be used as a replacement for natural soil in new concrete, offering many advantages. Despite these advantages, there are also critical barriers to the development of fRCA in new mixes. Among these, the first challenge is the variability of fRCA properties, in both physical, chemical, and mechanical terms. Many individual studies have been carried out on different RCA or fRCA properties, but little investigative work has been performed to analyze their dynamic properties. Therefore, the influence of the non-cohesive fine fraction content of RCA on the dynamic properties of this waste material, when used as a specific anthropogenic soil, has been studied in laboratory conditions, employing a standard resonant column apparatus, as well as piezoelectric elements. In the present research, special emphasis has been placed on the dynamic shear modulus, dynamic damping ratio, small-strain shear modulus, and small-strain damping ratio, as well as shear modulus degradation G(γ)/Gmax, the damping ratio increase D(γ)/Dmin, and the threshold shear strain amplitudes γtl and γtv. Artificially prepared fRCAs with varying fine fraction contents (0% ≤ FF ≤ 30%, within increments of 5%) have been tested at different pressures (p′ = 90, 180, and 270 kPa) and relative densities of Dr > 65%. This study also examined the effect of two tamping-based sample preparation methods, i.e., dry and wet tamping. The results presented herein indicate that the analyzed anthropogenic material, although derived from concrete and produced by human activities, behaves very similarly to natural aggregate when subjected to dynamic loading. The introduction of a fine fraction content to fRCA leads to changes in the dynamic properties of the tested mixture. Concrete material with lower stiffness but, at the same time, with stronger damping properties can be obtained. A fine fraction content of at least 30% is sufficient to cause a significant loss of stiffness and, at the same time, a significant increase in the damping properties of the mixture. This study can serve as a reference for designing fRCA mixtures in engineering applications.

show abstract

Physical, Deformation, and Stiffness Properties of Recycled Concrete Aggregate

Cited by 8 publications

References 24 publications

Main Challenges to Concrete Recycling in Practice

Main Challenges to Concrete Recycling in Practice

Evaluation of Anthropogenic Substrate Variability Based on Non-Destructive Testing of Ground Anchors

Effect of a Fine Fraction on Dynamic Properties of Recycled Concrete Aggregate as a Special Anthropogenic Soil

Contact Info

Product

Resources

About