Using Microwave Heating to Completely Recycle Concrete
Open Access
- 1 January 2014
- journal article
- Published by Scientific Research Publishing, Inc. in Journal of Environmental Protection
- Vol. 05 (07), 583-596
- https://doi.org/10.4236/jep.2014.57060
Abstract
The aim of this study was to develop a technique for the complete recycling of concrete based on microwave heating of surface modification coarse aggregate (SMCA) with only inorganic materials such as cement and pozzolanic materials (silica fume, fly ash). The mechanical properties of SMCA, which was produced using original coarse aggregate (OCA) and inorganic admixtures, as well as its separation from the cement matrix and recovery performance were quantitatively assessed. The experimental results showed that micro structural reinforcement of the interfacial transition zone, which is a weak part of concrete, by coating the surface of the OCA with cement and admixtures such as pozzolanic materials can help suppress the occurrence of micro-cracks and improve the mechanical performance of the OCA. Microwave heating was observed to cause micro-cracking and hydrate decomposition. Increasing the void volume and weakening the hydrated cement paste led to the effective recovery of recycled coarse aggregate.Keywords
This publication has 7 references indexed in Scilit:
- Effective Recycling of Surface Modification Aggregate using Microwave HeatingJournal of Advanced Concrete Technology, 2014
- COMPLETELY RECYCLABLE CONCRETE OF AGGREGATE-RECOVERY TYPE BY A NEW TECHNIQUE USING AGGREGATE COATINGJournal of Structural and Construction Engineering (Transactions of AIJ), 2010
- Application of Conventionally Recycled Coarse Aggregate to Concrete Structure by Surface Modification TreatmentJournal of Advanced Concrete Technology, 2007
- An Advanced Concrete Recycling Technology and its Applicability Assessment through Input-Output AnalysisJournal of Advanced Concrete Technology, 2005
- Influence of aggregate size, water cement ratio and age on the microstructure of the interfacial transition zoneCement and Concrete Research, 2003
- Shear bond testing of concrete repairsCement and Concrete Research, 1999
- A unified failure envelope from the evaluation of concrete repair bond testsMagazine of Concrete Research, 1995