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Effect of carbon-negative aggregates on the strength properties of concrete for permeable pavements

Monrose, John; Tota-Maharaj, Kiran; Mwasha, A; Hills, C.D

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Authors

A Mwasha

C.D Hills



Abstract

Permeable pavements are engineered to temporarily store water to reduce flooding during rainfall events. Permeable pavements are distinguished primarily based on their surface materials which can vary from concrete, asphalt, clay brick, concrete pavers or plastic grids. This paper examined the effect of lightweight carbon-negative aggregates (CNA) on the behaviour of concrete intended for use as solid concrete block pavers in permeable pavements. Performance indicators targeted compressive strength, splitting tensile strength, density and water absorption. CNA were produced and sourced from manufacturing firm Carbon8 Systems in Kent U.K which applies patented accelerated carbonation technology to solidify incinerated ash into useful eco-friendly aggregates. The methodology involved substituting natural aggregates (NA) by mass, with CNA at percentages varying from 0 to 100. A scanning electron microscope was used to examine the aggregate–mortar interface. Both the compressive and tensile strengths decreased exponentially with the addition of CNA. Average 28-day compressive and splitting tensile strengths ranged from 69 MPa (10,000 PSI) to 18 MPa (2600 PSI) and 3.84 MPa (560 PSI) to 1.23 MPa (178 PSI) respectively. Density values decreased linearly with the addtion of CNA with average values ranging from 2200–2600 kg/m3. ⁠Conversely, water absorption increased with increases in CNA with average values ranging from 1.66% to 9.17%. Depending on the loading requirements, CNA can replace NA in solid permeable pavement blocks by up to 100%.

Journal Article Type Article
Journal International Journal of Pavement Engineering
Print ISSN 1029-8436
Electronic ISSN 1477-268X
Publisher Taylor & Francis (Routledge)
Peer Reviewed Peer Reviewed
APA6 Citation Monrose, J., Tota-Maharaj, K., Mwasha, A., & Hills, C. (in press). Effect of carbon-negative aggregates on the strength properties of concrete for permeable pavements. International Journal of Pavement Engineering, https://doi.org/10.1080/10298436.2019.1567924
DOI https://doi.org/10.1080/10298436.2019.1567924
Keywords microstructure, lightweight concrete, compressive strength, permeable pavements, carbon-negative aggregate
Publisher URL https://doi.org/10.1080/10298436.2019.1567924
Additional Information Additional Information : This is an Accepted Manuscript of an article published by Taylor & Francis in International Journal of Pavement Engineering on 24/01/2019, available online: https://doi.org/10.1080/10298436.2019.1567924

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