Behaviour and Properties of Eco-Cement Pastes Elaborated with Recycled Concrete Powder from Construction and Demolition Wastes
Author/s
Caneda-Martínez, Laura; Monasterio, Manuel; Moreno-Juez, Jaime; Martínez-Ramírez, Sagrario; García, Rosario; [et al.]Date
2021-03-08Keywords
Construction and demolition waste
Supplementary cementitious materials
Circular economy
Eco-efficient cements
Abstract
This work analyses the influence of fine concrete fractions (<5 mm) of different natures
—calcareous (HcG) and siliceous (HsT)—obtained from construction and demolition waste (C&DW)
on the behaviour of blended cement pastes with partial replacements between 5 and 10%. The two
C&DW fractions were characterised by different instrumental techniques. Subsequently, their limefixing
capacity and the physico-mechanical properties of the blended cement pastes were analysed.
Lastly, the environmental benefits of reusing these fine wastes in the manufacture of future ecoefficient
cement pastes were examined. The results show that HsT and HcG exhibit weak pozzolanic
activity, owing to their low reactive silica and alumina content. Despite this, the new cement pastes
meet the physical and mechanical requirements of the existing regulations for common cements. It
should be highlighted that the blended cement pastes initially showed a coarser pore network, but
then they underwent a refinement ...
Type
journal article