Life cycle assessment of concrete made with high volume of recycled concrete aggregates and fly ash

Kurda, Rawaz; Silvestre, José Dinis

doi:10.1016/j.resconrec.2018.07.004

Cited by 202 publications

(67 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Several additions have been used together with C&DW as recycled aggregates, mainly with concrete recycled aggregates. Most of the results conclude that the combination of recycled concrete aggregate and fly ash [24,25] is not very beneficial for the mechanical resistance of concrete. A previous work limits the percentage of fly ash to 10% [25].…”

Section: Introductionmentioning

confidence: 99%

On the Possibility of Using Recycled Mixed Aggregates and GICC Thermal Plant Wastes in Non-Structural Concrete Elements

et al. 2019

View full text Add to dashboard Cite

Industrial wastes are often used as aggregate in concrete production to promote a more sustainable construction and to reduce production costs. This article presents the results of an experimental campaign on the influence of replacing natural aggregate with several construction and demolition wastes (C&DW) as recycled aggregate, as well as the use of fly ash and slag, wastes produced in Gas Incinerator Combined Cycle (GICC) thermal power plants, in the mix design of non-structural concrete. Different percentages of natural aggregates were substituted with recycled aggregates either coming from construction and demolition wastes, or from the coarse fraction of the slags from thermic plants in the manufacture of concrete. The mechanical properties, capillary water absorption, density, carbonation, chloride ingress and sulphate resistance have been tested. The results show a decrease in properties when C&DW are used. Fine fraction of slag and fly ash has an important advantage, and can even improve the long term properties of concrete prepared with natural aggregates. Coarse fraction of slag as a recycled aggregate generally improves most of the properties of manufactured concretes.

show abstract

Section: Introductionmentioning

confidence: 99%

On the Possibility of Using Recycled Mixed Aggregates and GICC Thermal Plant Wastes in Non-Structural Concrete Elements

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Rawaz Kurda et al [11] compared the environmental impacts of concrete mixes, which contain different incorporation ratios of fly ash and recycled concrete aggregates, with and without Superplasticizer. Mayuri Wijayasundara et al [12] attempted to simulate the manufacturing set up to produce RAC by integrating processes involved in concrete waste recycling and concrete production environments.…”

Section: Literature Reviewmentioning

confidence: 99%

Analysis of Life Cycle Environmental Impact of Recycled Aggregate

et al. 2019

View full text Add to dashboard Cite

This study assessed the influence of matter discharged during the production (dry/wet) of recycled aggregate on global warming potential (GWP) and acidification potential (AP), eutrophication potential (EP), ozone depletion potential (ODP), biotic resource depletion potential (ADP), photochemical ozone creation potential (POCP) using the ISO 14044 (LCA) standard. The LCIA of dry recycled aggregate was 2.94 × 10−2 kg-CO2eq/kg, 2.93 × 10−5 kg-SO2eq/kg, 5.44 × 10−6 kg-PO43eq/kg, 4.70 × 10−10 kg-CFC11eq/kg, 1.25 × 10−5 kg-C2H4eq/kg, and 1.60 × 10−5 kg-Antimonyeq/kg, respectively. The environmental impact of recycled aggregate (wet) was up to 16~40% higher compared with recycled aggregate (dry); the amount of energy used by impact crushers while producing wet recycled aggregate was the main cause for this result. The environmental impact of using recycled aggregate was found to be up to twice as high as that of using natural aggregate, largely due to the greater simplicity of production of natural aggregate requiring less energy. However, ADP was approximately 20 times higher in the use of natural aggregate because doing so depletes natural resources, whereas recycled aggregate is recycled from existing construction waste. Among the life cycle impacts assessment of recycled aggregate, GWP was lower than for artificial light-weight aggregate but greater than for slag aggregate.

show abstract

“…For example, Panesar et al (2017) defined a functional unit where the volume of the BC concrete is multiplied by its compressive strength and the chloride ion penetration resistance, and compared to the FU of an equivalent OPC concrete. Similarly, Kurda et al (2018) multiplied the "relative environmental impact of FA concrete compared to that of an OPC concrete" by the "relative chloride penetration coefficient" in order to optimize concrete mixes in terms of durability and environmental impact. Additionally, the same two mentioned parameters were also used by Celik et al (2015) when comparing durability based environmental impact of conventional concrete with concrete mixes containing both FA and lime.…”

Section: 3mentioning

confidence: 99%

A proposed performance based approach for life cycle assessment of reinforced blended cement concrete

Hafez¹,

Cheung²,

Nagaratnam³

et al. 2019

Sustainable Construction Materials and Technologies (SCMT)

Self Cite

View full text Add to dashboard Cite

The use of supplementary cementitious materials (e.g. fly ash and ground granulated blast furnace slag) as a partial replacement of ordinary Portland cement (OPC) in blended cement (BC) concrete has been established in recent years. However, an optimum mix design of BC concrete should not only achieve the targeted mechanical properties but also aim at minimizing the cost as well as environmental impacts. The first step towards an accurate estimate of BC concrete's environmental impacts is to define an indicative functional unit. Unfortunately, most of the research that uses life cycle assessment (LCA) to compare OPC and BC concrete, selects a simple functional unit without taking into consideration the difference in mechanical properties and durability characteristics. Although several efforts were found integrating the durability characteristics in the environmental impact assessment over the whole life cycle, no consensus was found. In this study, a novel approach to quantifying the environmental impact of BC concrete compared to OPC concrete as a part of a decision making process on the type and mixing proportions of concrete to minimize its environmental impact. Using LCA, the method proposes that performance based parameters are defined: a targeted compressive strength and service life. Predictions should be made of these parameters based on generic user-input data like type of BC, water/binder ratios, binder content and OPC replacement rates. The comparative environmental impact is then quantified accordingly. It is believed that this novel approach allows the user to accurately select and proportion a blended cement concrete mix with the objective of minimizing its environmental impact.

show abstract

Life cycle assessment of concrete made with high volume of recycled concrete aggregates and fly ash

Cited by 202 publications

References 16 publications

On the Possibility of Using Recycled Mixed Aggregates and GICC Thermal Plant Wastes in Non-Structural Concrete Elements

On the Possibility of Using Recycled Mixed Aggregates and GICC Thermal Plant Wastes in Non-Structural Concrete Elements

Analysis of Life Cycle Environmental Impact of Recycled Aggregate

A proposed performance based approach for life cycle assessment of reinforced blended cement concrete

Contact Info

Product

Resources

About