ASSESSMENT OF FINE RECYCLED AGGREGATES IN MORTAR

In this study, the influence of fine recycled concrete aggregates as replacement for sand in mortar and the use as cement replacement and filler is investigated. Mortar with fine recycled aggregates is examined on its mechanical and physical properties. The samples are also examined on a microscopic scale. The fine recycled concrete aggregates are made with one-year old concrete made in the laboratory. Fine recycled aggregates (FRCA) are added as a cement replacement (0 %, 10 % and 20 %), as a sand replacement replacing different fractions of natural sand, and as a filler (5 %, 10 % and 25 %). For the cement replacement and filler, the fines are made as fine as possible: (< 0,32 and < 0,16 mm). Fine recycled concrete aggregates used as a cement replacement have a negative influence on all properties. For the use as a sand replacement, the mixtures show an increase in strength, but a significant decrease in workability. The use as a filler is proven feasible for mix proportion using up to 10 % of fine recycled concrete aggregates. This has a positive influence on the properties of mortar.

ISBN:978-80-271-0248-8

Publication year:2016

Accessibility:Open