A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Physical and Mechanical Properties of Mortar Made with Recycled Fine Aggregate
Construction and demolition waste recycling is generally limited to the use of the coarser fraction as aggregate for new concrete. The recovery of fine aggregates requires a cleaning by removing the hydrated cement waste. These fines, however, are normally discarded, despite being the by-product of the highest costing component of the original concrete, both in economic and in environmental terms. This paper investigates the properties of mortar containing recycled fine aggregate (RFA) as natural aggregate replacement. The RFA was obtained in laboratory by crushing mechanically hydrated cement waste, and then sieved. Five mixtures were made with natural and/or RFA and physical, mechanical and durability (based on drying shrinkage test) behavior was studied. Natural aggregate was replaced with RFA contents between 25% and 100% and a control mixture (with 100% natural aggregate) was also developed. Results indicate an elevated porosity, water absorption and shrinkage of mortars by using RFA, but a strong reduction in density, flexural and compressive strength. However, even with these reductions, the mixtures studied obtained the minimum values established in standards for the use as masonry mortars or other purposes with lower density or strength level. In addition, by using 100% RFA in mortar mixture can be an effective strategy to maximize the hydrated cement waste recycling and enhancing the sustainability index of mortars.
Physical and Mechanical Properties of Mortar Made with Recycled Fine Aggregate
Construction and demolition waste recycling is generally limited to the use of the coarser fraction as aggregate for new concrete. The recovery of fine aggregates requires a cleaning by removing the hydrated cement waste. These fines, however, are normally discarded, despite being the by-product of the highest costing component of the original concrete, both in economic and in environmental terms. This paper investigates the properties of mortar containing recycled fine aggregate (RFA) as natural aggregate replacement. The RFA was obtained in laboratory by crushing mechanically hydrated cement waste, and then sieved. Five mixtures were made with natural and/or RFA and physical, mechanical and durability (based on drying shrinkage test) behavior was studied. Natural aggregate was replaced with RFA contents between 25% and 100% and a control mixture (with 100% natural aggregate) was also developed. Results indicate an elevated porosity, water absorption and shrinkage of mortars by using RFA, but a strong reduction in density, flexural and compressive strength. However, even with these reductions, the mixtures studied obtained the minimum values established in standards for the use as masonry mortars or other purposes with lower density or strength level. In addition, by using 100% RFA in mortar mixture can be an effective strategy to maximize the hydrated cement waste recycling and enhancing the sustainability index of mortars.
Physical and Mechanical Properties of Mortar Made with Recycled Fine Aggregate
RILEM Bookseries
Amziane, Sofiane (editor) / Merta, Ildiko (editor) / Page, Jonathan (editor) / da Magalhães, Margareth Silva (author) / Pinto, Wallace Alves (author)
International Conference on Bio-Based Building Materials ; 2023 ; Vienna, Austria
2023-06-14
10 pages
Article/Chapter (Book)
Electronic Resource
English
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