Title:
Workability and Strength of Ultra-High-Performance Concrete Containing Nano-Ca(OH)2-Modified Recycled Fine Aggregates
Author(s):
Binbin Zhang, Tao Ji, Yu Ma, Yu Yang, and Yantong Hu
Publication:
Materials Journal
Volume:
119
Issue:
5
Appears on pages(s):
165-174
Keywords:
nano calcium hydroxide (nano-CH); recycled fine aggregate (RFA); strength; ultra-high-performance concrete (UHPC); workability
DOI:
10.14359/51735953
Date:
9/1/2022
Abstract:
To improve the surface properties of recycled fine aggregates
(RFAs), it is better to replace natural aggregates for the preparation of ultra-high-performance concrete (UHPC). The feasible modification method of RFA carbonization after being soaked in nano calcium hydroxide (nano-CH) solution (ICRFA) is investigated. Untreated RFA (URFA) and carbon dioxide-treated RFA were the control groups. The results revealed that the pores of RFA were filled by calcium carbonate (CaCO3) generated from the carbonization of nano-CH. The total porosity and the contents of harmful pores and multi-harmful pores of UHPC were reduced. Furthermore, the effective water-binder ratio (w/b) of UHPC with RFA was higher than that of UHPC with ICRFA. Therefore, the compressive strength of UHPC with ICRFA at 28 days was significantly higher than that of UHPC with URFA. The modification method of ICRFA is a more effective and economical method for improving compressive
strength than that of CO2-treated RFA (CRFA).
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