Study of the consistence and mechanical behavior of recycled mortars

Title: Study of the consistence and mechanical behavior of recycled mortars
Author(s): M.B. Leite, P.R.L. Lima and A.C. Santos
Paper category : conference
Book title: 2nd International RILEM Conference on Progress of Recycling in the Built Environment
Editor(s): V.M. John, E. Vazquez, S.C. Angulo, C. Ulsen
e-ISBN: 978-2-35158-122-3
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 223 - 229
Total Pages: 7
Nb references: 9
Language: English

Abstract: The use of recycled fine aggregate (RFA) from construction and demolition waste (CDW) affects some properties of the mortar due irregular form, rougher surface texture and the highest absorption rate, when compared with natural aggregate. This led to increase the amount of water of the mixtures to improve workability. However, this practice can affect other properties of the mortar in the hardened state, like compressive strength. It must be found a balance between the workability and mechanical behavior of the recycled mortars in respect of the total water used in the mixtures. In this study were evaluated six different compensation rates (50, 60, 70, 80, 90 and 100%) of the water absorption rate in mortars with RFA. Mortars were produced with a cement/aggregate relation of 1:4, by weight, and a consistence of 260 ± 10 mm.
Recycled fine aggregate was used to replace natural sand at 0, 50 and 100% by weight.
The mortars were evaluated by the consistence index, compressive strength, at 28 days of age, and consistence loss with the time. The results showed that the use of CDW for the production of mortars is technically viable and that so much the substitution rate of fine aggregate, as the rate of compensation of the absorption of water of the RFA influences the properties of the mortars.

Online publication: 2012-02-08
Publication type : full_text
Public price (Euros): 0.00