Open AccessMixed Low-density Demolition Waste in Production of Lightweight Cement-based Composites
Author(s) -
Jaroslav Pokorný,
Jiří Šál,
Radek Ševčík
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1066/1/012008
Subject(s) - materials science , demolition waste , composite material , curing (chemistry) , porosity , flexural strength , compressive strength , cement , demolition , aggregate (composite) , civil engineering , engineering
Lightweight concretes are traditionally used composites intended for non-bearing applications. In their composition, various types of lightweight natural as well as industrially produced aggregates are employed. Regard to the considerable aggregates consumption, the potential application of mixed low-density demolition waste (MDW) in production of cement-based composites was studied in this paper. In mixes with maintained workability, silica sand was replaced by MDW in the amount of 0 – 100 vol. %. On hardened developed composites, basic physical properties, strength properties and dynamic moduli were determined and compared with control material after 28 days of water curing. Due to reduced weight of waste aggregate compared with the silica sand, hardened composites showed importantly lower bulk density. However, their increasing porosity induced by higher MDW additions led to the decrease of compressive and flexural strengths and dynamic moduli values. With respect to the maintaining of mechanical resistance, quantities of incorporated MDW not exceeding 25 % were chosen as an optimal replacements ratio.