Evaluation of compressive strength, porosity and interstitial transition zone in mortars with recycled fine aggregates

Materia

article

Matheus Ian Castro Sousa¹  Thiago da Silva Santana¹  Cássia Aparecida Rabelo Corrêa¹  João Henrique da Silva Rêgo¹  Cláudio Henrique de Almeida Feitosa Pereira¹ 

[1] Universidade de Brasília

关键词: Microstructure;    Mechanical Properties;    Scanning Electron Microscopy;   

DOI  :  10.1590/S1517-707620220002.1398

学科分类：工程和技术（综合）

来源: Universidade Federal do Rio de Janeiro * Coordenacao dos Programas de Pos-Graduacao de Engenharia

【 摘 要 】

The use of recycled aggregates in substitution to natural materials is increasing in civil construction, aiming to solve problems from the construction industry regarding supply of natural raw materials and cost of providing adequate destination for waste materials. While the use of coarse aggregate is already relatively accepted, the viable application of recycled fine aggregate still demands more research. The present work had the objective of evaluating a recycled fine aggregate originated from construction and demolition waste available at Distrito Federal. Therefore, two mortars were produced, one reference (ARN) using all fractions of Brazilian standard sand, and one using recycled aggregate (AR1). Those mortars were subjected to compressive strength tests and mercury intrusion porosimetry at 3, 7, and 28 days of curing, and to scanning electron microscopy, only at 28 days. It was observed that the use of recycled aggregates increased the total porosity of the mortars, decreased the pore structure refinement and increased the width of microcracks located in the transition zone. As a consequence, mechanical performance was 15% inferior to the reference mortar at all ages.

【 授权许可】

CC BY