The modification effects of a nano-silica slurry on microstructure, strength, and strain development of recycled aggregate concrete applied in an enlarged structural test

Hongru Zhang; Yuxi Zhao; Tao Meng; Surendra P. Shah

doi:10.1016/j.conbuildmat.2015.07.089

The modification effects of a nano-silica slurry on microstructure, strength, and strain development of recycled aggregate concrete applied in an enlarged structural test

Hongru Zhang, Yuxi Zhao^*, Tao Meng, Surendra P. Shah

^*Corresponding author for this work

Civil and Environmental Engineering

Research output: Contribution to journal › Article › peer-review

83 Scopus citations

Abstract

The modification effects of a nano-silica slurry on properties of recycled aggregate concrete (RAC) were experimentally studied. Together with natural aggregate concrete (NAC), non-modified and modified RAC were applied in three beams in a real project. The beneficial effects of the nano-silica slurry on RAC's mechanical properties were certificated. In situ strain monitoring in the target beams showed the improved resistance to cracking of RAC after modification. Nanoindentation tests proved that the nano-silica slurry enhanced the new interface transition zone (ITZ) between the old and new mortars in RAC, and surface-strengthened the old mortar, while the old ITZ between old aggregate was not strengthened.

Original language	English (US)
Pages (from-to)	721-735
Number of pages	15
Journal	Construction and Building Materials
Volume	95
DOIs	https://doi.org/10.1016/j.conbuildmat.2015.07.089
State	Published - Jul 31 2015

Keywords

In situ concrete strain
Nano-silica
Nanoindentation
Recycled aggregate concrete (RAC)

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Materials Science(all)

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10.1016/j.conbuildmat.2015.07.089

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title = "The modification effects of a nano-silica slurry on microstructure, strength, and strain development of recycled aggregate concrete applied in an enlarged structural test",

abstract = "The modification effects of a nano-silica slurry on properties of recycled aggregate concrete (RAC) were experimentally studied. Together with natural aggregate concrete (NAC), non-modified and modified RAC were applied in three beams in a real project. The beneficial effects of the nano-silica slurry on RAC's mechanical properties were certificated. In situ strain monitoring in the target beams showed the improved resistance to cracking of RAC after modification. Nanoindentation tests proved that the nano-silica slurry enhanced the new interface transition zone (ITZ) between the old and new mortars in RAC, and surface-strengthened the old mortar, while the old ITZ between old aggregate was not strengthened.",

keywords = "In situ concrete strain, Nano-silica, Nanoindentation, Recycled aggregate concrete (RAC)",

author = "Hongru Zhang and Yuxi Zhao and Tao Meng and Shah, {Surendra P.}",

note = "Funding Information: Financial support from the National Specialized Research Fund for Doctoral Program (20120101110025) and New Century Excellent Talents in University (NCET-12-0493) are gratefully acknowledged. The authors also would like to thank Dr. Gajendra Shekhawat from Northwestern University and M. Eng. Yongnian Zhu from the Zhejiang College of Construction for their kind guidance and support. The nanoindentation tests in this work used the NIFTI facility (NUANCE Center-Northwestern University). Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd. All rights reserved.",

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doi = "10.1016/j.conbuildmat.2015.07.089",

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AU - Zhang, Hongru

AU - Zhao, Yuxi

AU - Meng, Tao

AU - Shah, Surendra P.

N1 - Funding Information: Financial support from the National Specialized Research Fund for Doctoral Program (20120101110025) and New Century Excellent Talents in University (NCET-12-0493) are gratefully acknowledged. The authors also would like to thank Dr. Gajendra Shekhawat from Northwestern University and M. Eng. Yongnian Zhu from the Zhejiang College of Construction for their kind guidance and support. The nanoindentation tests in this work used the NIFTI facility (NUANCE Center-Northwestern University). Publisher Copyright: © 2015 Elsevier Ltd. All rights reserved.

PY - 2015/7/31

Y1 - 2015/7/31

N2 - The modification effects of a nano-silica slurry on properties of recycled aggregate concrete (RAC) were experimentally studied. Together with natural aggregate concrete (NAC), non-modified and modified RAC were applied in three beams in a real project. The beneficial effects of the nano-silica slurry on RAC's mechanical properties were certificated. In situ strain monitoring in the target beams showed the improved resistance to cracking of RAC after modification. Nanoindentation tests proved that the nano-silica slurry enhanced the new interface transition zone (ITZ) between the old and new mortars in RAC, and surface-strengthened the old mortar, while the old ITZ between old aggregate was not strengthened.

AB - The modification effects of a nano-silica slurry on properties of recycled aggregate concrete (RAC) were experimentally studied. Together with natural aggregate concrete (NAC), non-modified and modified RAC were applied in three beams in a real project. The beneficial effects of the nano-silica slurry on RAC's mechanical properties were certificated. In situ strain monitoring in the target beams showed the improved resistance to cracking of RAC after modification. Nanoindentation tests proved that the nano-silica slurry enhanced the new interface transition zone (ITZ) between the old and new mortars in RAC, and surface-strengthened the old mortar, while the old ITZ between old aggregate was not strengthened.

KW - In situ concrete strain

KW - Nano-silica

KW - Nanoindentation

KW - Recycled aggregate concrete (RAC)

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The modification effects of a nano-silica slurry on microstructure, strength, and strain development of recycled aggregate concrete applied in an enlarged structural test

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Keywords

ASJC Scopus subject areas

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