Mechanical and Durability Characterization of Hybrid Recycled Aggregate Concrete

Mechanical and Durability Characterization of Hybrid Recycled Aggregate Concrete

The recycling of construction and demolition waste (CDW) for the extraction of recycled concrete aggregates (RCAs) to be used to produce recycled aggregate concrete (RAC) is widely acknowledged internationally. However, CDW not only contains concrete debris but may also contain burnt clay bricks. Th...

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Bibliographic Details
Published in:Materials Vol. 17; no. 7; p. 1571
Main Authors: Hameed, Rashid, Tahir, Muhammad, Abbas, Safeer, Sheikh, Haseeb Ullah, Kazmi, Syed Minhaj Saleem, Munir, Muhammad Junaid
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 01-04-2024
Subjects:
Aggregates
Bricks
burnt clay bricks
Chloride
Clay
Compressive strength
Concrete
Concrete aggregates
Construction industry
Developing countries
Durability
Earthquakes
Emission standards
Emissions
Fly ash
hybrid form
Infrastructure
Landfill
LDCs
Mechanical properties
mechanical strength
Modulus of rupture
Natural resources
Pakistan
recycled aggregates
Recycled materials
Recycling (Waste, etc.)
United Kingdom
Waste disposal
Water absorption
United Kingdom
Pakistan
Nepal
concrete
mechanical strength
hybrid form
recycled aggregates
durability
burnt clay bricks
sustainability
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Summary:The recycling of construction and demolition waste (CDW) for the extraction of recycled concrete aggregates (RCAs) to be used to produce recycled aggregate concrete (RAC) is widely acknowledged internationally. However, CDW not only contains concrete debris but may also contain burnt clay bricks. The recycling of such CDW without the segregation of different components would result in recycled aggregates having different proportions of concrete and brick aggregates. The utilization of these aggregates in concrete requires a detailed investigation of their mechanical and durability properties. In this regard, the present study focused on investigating the mechanical and durability properties of hybrid recycled aggregate concrete (HRAC) made by the 100% replacing of natural aggregates with recycled brick (RBAs) and RCA in hybrid form. The partial replacement of cement with fly ash was also considered to reduce the corban footprint of concrete. An extensive experimental program was designed and carried out in two phases. In the first phase, a total of 48 concrete mixes containing coarse RBA and RCA in mono and hybrid forms were prepared and tested for their compressive strength. The test results indicated that the compressive strength of HRAC is greatly affected by the proportion of coarse RBA and RCA. In the second phase, based on the results of the first phase, eight concrete mixes with the most critical proportions of RBA and RCA in hybrid form were selected to evaluate their mechanical and durability performance. In addition, four mixes with natural aggregates were also prepared for comparison purposes. To evaluate the mechanical properties of the concrete mixes, compressive strength and modulus of rupture (MOR) tests were performed, while for the evaluation of durability properties, water absorption and behavior after exposure to aggressive conditions of acidic and brine solutions were studied. The results revealed that a 20% replacement of cement with fly ash resulted in acceptable mechanical and durability properties of HRAC intended to be used for making concrete bricks or pavers.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma17071571