Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Flexural behaviour of functionally graded reinforced concrete slabs with vertical or horizontal layers
Concrete floor and ground slabs in building frames represent a significant embodied CO2 footprint. One promising way to reduce the environmental impact is to tailor the concrete properties within a slab to meet spatially varied performance requirements such that concrete with a higher cement content is used only where necessary. An experimental programme to investigate simply-supported functionally layered slabs with either horizontal or vertical layers was undertaken to ascertain whether a desired serviceability performance can be achieved in tandem with a relatively lower embodied CO2. The test matrix compared three single mix slabs, two horizontally layered slabs with different layer thicknesses and two vertically layered slabs with different zonations. The slabs were 1200 mm long by 500 mm wide and either 120 or 160 mm thick. Conventional concrete materials consisting of a high strength (target compressive strength of 60 MPa) and a low strength (target compressive strength of 20 MPa) concrete mix were layered. The influence of the concrete mix properties, the tensile horizontal high strength layer thickness (20 mm or 56 mm) and the location of the high strength concrete (in the interior 233 mm width or exterior 133 mm wide regions) in a slab with vertical interfaces were probed. The layers were cast in the fresh-state with less than a 30 min pour delay to promote hydration across the interfaces. The one-way spanning slabs were tested in four-point bending where the distance between supports was 1000 mm and the shear span was 250 mm. The horizontally layered slab with a 56 mm high strength concrete layer had a higher elastic stiffness and provided an uplift in first cracking moment of around 60% relative to an analogous single mix low strength concrete slab. Beneficial restraint between weaker and stronger mixes across vertical interfaces led to an approximately 30% increase in cracking load relative to the single mix lower strength slab. It was observed that the placement of the stronger mix in the exterior ...
Flexural behaviour of functionally graded reinforced concrete slabs with vertical or horizontal layers
Concrete floor and ground slabs in building frames represent a significant embodied CO2 footprint. One promising way to reduce the environmental impact is to tailor the concrete properties within a slab to meet spatially varied performance requirements such that concrete with a higher cement content is used only where necessary. An experimental programme to investigate simply-supported functionally layered slabs with either horizontal or vertical layers was undertaken to ascertain whether a desired serviceability performance can be achieved in tandem with a relatively lower embodied CO2. The test matrix compared three single mix slabs, two horizontally layered slabs with different layer thicknesses and two vertically layered slabs with different zonations. The slabs were 1200 mm long by 500 mm wide and either 120 or 160 mm thick. Conventional concrete materials consisting of a high strength (target compressive strength of 60 MPa) and a low strength (target compressive strength of 20 MPa) concrete mix were layered. The influence of the concrete mix properties, the tensile horizontal high strength layer thickness (20 mm or 56 mm) and the location of the high strength concrete (in the interior 233 mm width or exterior 133 mm wide regions) in a slab with vertical interfaces were probed. The layers were cast in the fresh-state with less than a 30 min pour delay to promote hydration across the interfaces. The one-way spanning slabs were tested in four-point bending where the distance between supports was 1000 mm and the shear span was 250 mm. The horizontally layered slab with a 56 mm high strength concrete layer had a higher elastic stiffness and provided an uplift in first cracking moment of around 60% relative to an analogous single mix low strength concrete slab. Beneficial restraint between weaker and stronger mixes across vertical interfaces led to an approximately 30% increase in cracking load relative to the single mix lower strength slab. It was observed that the placement of the stronger mix in the exterior ...
Flexural behaviour of functionally graded reinforced concrete slabs with vertical or horizontal layers
Giménez Fernández, M (Autor:in) / Lees, JM (Autor:in)
01.01.2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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