Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 35, Issue -, Pages 1045-1055Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2012.06.022
Keywords
Recycled Aggregate Concrete (RAC); Two-stage Mixing Approach (TSMA); Interfacial Transition Zone (ITZ); Nanoindentation; Microstructure
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Funding
- National Natural Science Foundation of China [51178340]
- Shanghai Science and Technology Committee [10231202000]
- Kwang-Hua Foundation
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Interfacial Transition Zone (ITZ) is an important phase that influences the mechanical properties of Recycled Aggregate Concrete (RAC). This paper is devoted to an investigation of the effect of different mixing; approaches on the properties of ITZs in RAC. Nanoindentation and Scanning Electron Microscopy (SEM) were implemented to characterize nanomechanical properties and microstructures of the old and new ITZs. The results indicate that the indentation modulus of ITZs have different distribution trends when using different mixing approaches. It reveals that the Two-Stage Mixing Approach (TSMA) can improve the nanomechanical properties of the new ITZ by reducing the volume fraction of voids and Calcium Hydroxide (CH). The SEM observation also indicates that an obviously denser and more homogeneous microstructure was achieved in the new ITZ prepared by TSMA compared to a Normal Mixing Approach (NMA). Correlating the nanoindentation and SEM results with the compressive strength, it can be concluded that TSMA has a beneficial influence on the mechanical properties of RAC by improving the properties of the new ITZ. (C) 2012 Elsevier Ltd. All rights reserved.
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