Evaluating the performance of self compacting concretes made with recycled coarse and fine aggregates using non destructive testing techniques

Singh, Navdeep; Singh, Surinder P.

doi:10.1016/j.conbuildmat.2018.06.039

Cited by 77 publications

(32 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This happens due to the lower density of the recycled aggregates, thus interfering in the propagation speed of the ultrasonic waves. For RAC-G100 it was observed a decrease close to 30% in UPV, the same behaviour observed by other researchers that reported a decrease of about 5% in UPV with 50% replacement of fine aggregate from RA [26][27][28].…”

Section: Ultrassonic Pulse Velocity (Upv) Testssupporting

confidence: 89%

Preliminary Analysis of the Use of Construction Waste to Replace Conventional Aggregates in Concrete

et al. 2021

View full text Add to dashboard Cite

This work aims to study the influence of using construction and demolition waste in the replacement of coarse and fine aggregate to produce recycled aggregate concrete (RAC). A moderate compressive strength concrete made with usual fine and coarse aggregate was used as a benchmark material. Compressive and split tensile tests were performed using 120 cylindrical concrete specimens with 150 mm diameter and 300 mm length. Four-point flexural tests in reinforced beams made with conventional concrete and RAC were performed. The results obtained showed that the use of recycled fine aggregates, in both percentages of substitution investigated—50% and 100%— did not generate any deleterious influence on the values of compressive strength and split tensile strength of the RACs produced. Tin fact, the mechanical strengths of RACs produced with recycled fine aggregate were equal or higher than those from the reference concrete. The same behavior was not observed, however, when the recycled coarse aggregate was used. For this case, decreases in concrete mechanical strengths were observed, especially in compressive strength, with values around 35% lower when compared to the reference concrete. Tensile mechanical tests results confirmed the excellent behavior of all RACs made with replacement of usual fine aggregates by recycled. Bending tests performed in reinforced RAC beams had as objective to evaluate the deformation profile of the beams. The obtained results showed that RAC beams with full replacement of usual fine aggregate by the recycled aggregates have presented little changes in the global behavior, an aspect that encourages its use.

show abstract

Section: Ultrassonic Pulse Velocity (Upv) Testssupporting

confidence: 89%

Preliminary Analysis of the Use of Construction Waste to Replace Conventional Aggregates in Concrete

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In order to determine the durability performance of UHDC and R-UHDC based on recycled aggregates (Singh and Singh, 2018), tests were performed including direct methods for the determination of durability including capillary suction, rapid chloride ion penetration test (RCPT), and non-steady-state chloride migration coefficient, together with indirect methods including vacuum saturation porosity. In addition, the surface resistivity and ultrasonic pulse velocity (UPV) were determined.…”

Section: Durability Characteristics Of Recycled Ultra-high Durability Concretementioning

confidence: 99%

Performance Assessment of Ultra-High Durability Concrete Produced From Recycled Ultra-High Durability Concrete

Borg

Cuenca

Garofalo

et al. 2021

Front. Built Environ.

View full text Add to dashboard Cite

The purpose of the work reported in this paper is to assess the performance of recycled ultra-high durability concrete (R-UHDC), produced using different fractions of recycled aggregate obtained from crushed ultra-high durability concrete (UHDC), as a substitute for the natural aggregate. Four different recycled ultra-high durability concrete (R-UHDC) mixes were designed and manufactured with a reference mix based on the natural aggregate and three mixes with the natural aggregate replaced using recycled UHDC according to two percentage replacement values (50 and 100%). The effect of environmental degradation of the recycled parent concrete was also addressed, using recycled aggregates subjected to accelerated carbonation (replacement percentage equal to 50%). The work has been conducted in the framework of the activities of the Horizon 2020 ReSHEALience Project in ultra-high durability concrete. One key objective of the project was to formulate the concept and experimentally validate the performance of ultra-high durability concrete for structures and infrastructures exposed to extremely aggressive scenarios. The ReSHEALience consortium has defined UHDC as a “strain-hardening (fiber-reinforced) cementitious material with functionalizing micro- and nano-scale constituents especially added to deliver high durability in the cracked state under extremely aggressive exposure conditions.” In this context, the research was conducted to investigate the potential of recycling the UHDC mixes, developed and validated in previous research and employing them as a partial or even total replacement of the natural fine aggregate in the production of new UHDC. This supports the cradle-to-cradle approach in life cycle engineering applications. The research confirmed the effective regeneration of new UHDC based on the recycled aggregate obtained from crushed UHDC, attaining the required rheological characteristics, mechanical properties (compressive strength, flexural strength, and toughness), and durability performance (chloride penetration resistance, chloride migration, water capillary suction, and resistivity). This work is intended as the first step toward the sustainability assessment of the end of life of UHDC materials and structures and the potential of recycled UHDC for new structures and retrofit structural applications.

show abstract

“…Recently, there was a shift in the direction of the research concerning recycled aggregates focusing more on RFA made with glass, lightweight materials, etc. The reason is that these studies [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] recommended not to include CDW as RFA anymore just on the basis of its functional properties. For that reason, in this study, the applicability of RFA in concrete in terms of all parameters (quality, environmental impact, energy consumption, toxicity and cost) was considered.…”

Section: Introductionmentioning

confidence: 99%

A Critical Review on the Influence of Fine Recycled Aggregates on Technical Performance, Environmental Impact and Cost of Concrete

Hafez

Kurda

et al. 2020

Applied Sciences

View full text Add to dashboard Cite

The aim of this critical review is to show the applicability of recycled fine aggregates (RFA) in concrete regarding technical performance, environmental impact, energy consumption and cost. It is not possible to judge the performance of concrete by considering one dimension. Thus, this study focussed on the fresh and hardened (e.g., mechanical and durability) properties and environmental and economic life cycle assessment of concrete. Most literature investigated showed that any addition of recycled fine aggregates from construction and demolition waste as a replacement for natural fine aggregates proves detrimental to the functional properties (quality) of the resulting concrete. However, the incorporation of recycled fine aggregates in concrete was proven to enhance the environmental and economic performance. In this study, an extensive literature review based multi criteria decision making analysis framework was made to evaluate the effect of RFA on functional, environmental, and economic parameters of concrete. The results show that sustainability of RFA based concrete is very sensitive to transportation distances. Several scenarios for the transportation distances of natural and recycled fine aggregates and their results show that only if the transportation distance of the natural aggregates is more than double that of RFA, e the RFA based concrete alternatives would be considered as more sustainable.

show abstract

Evaluating the performance of self compacting concretes made with recycled coarse and fine aggregates using non destructive testing techniques

Cited by 77 publications

References 21 publications

Preliminary Analysis of the Use of Construction Waste to Replace Conventional Aggregates in Concrete

Preliminary Analysis of the Use of Construction Waste to Replace Conventional Aggregates in Concrete

Performance Assessment of Ultra-High Durability Concrete Produced From Recycled Ultra-High Durability Concrete

A Critical Review on the Influence of Fine Recycled Aggregates on Technical Performance, Environmental Impact and Cost of Concrete

Contact Info

Product

Resources

About