纳米偏高岭土及细骨料对UHPC力学性能的影响

doi:10.11896/cldb.22070261

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Abstract Using good mineral admixtures and green fine aggregates to partially replace cements and quartz sands to prepare ecological ultra high performance concrete (UHPC) can optimize its properties and reduce the carbon emission during material preparation. There is a lack of research about the tensile strain hardening behavior of ecological UHPC. The influence of nano-metakaolin contents (0%, 3% and 6%) and fine aggregate types (quartz sand, river sand and manufactured sand) on the mechanical properties of UHPC was studied via uniaxial tensile tests, compressive strength tests and workability measurements. Finally, the tensile strain hardening mechanism of UHPC incorporated with nano-metakaolin and manufactured sand was clarified based on microstructural analysis. The results show that nano-metakaolin can improve the bond behavior of steel fiber-UHPC matrix interface, and increase the strain hardening capacity of UHPC and raise the recovery efficiency of steel fiber effective anchorage. The promotion space of the strain hardening capacity of UHPC incorporated with manufactured sands is relatively low due to that manufactured sands can improve the high cracking strength of UHPC. The drawing resistance provided by manufactured sands for steel fibers is insufficient during steel fiber pulling out, and the scratch grooves are unobvious and the crushed debris of UHPC matrix is slight on the surface of the pulled-out steel fibers. This makes the tensile strain softening rate of UHPC accelerated.

Key words： ultra high performance concrete (UHPC) nano-metakaolin manufactured sand tensile strain hardening microstructural analysis

Published: 10 December 2023 Online: 2023-12-08

CLC number:

TU528

Fund:Department of Transportation of Zhejiang Province (2021030), the National Natural Science Foundation of China (52078358, 52108239), China Postdoctoral Science Foundation (2020M671215).

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	Articles by authors
	BIAN Chen
	GUO Junyuan
	XIAO Jianzhuang
	ZHAO Changjun

Cite this article:

BIAN Chen,GUO Junyuan,XIAO Jianzhuang, et al. Effect of Nano-metakaolin and Fine Aggregate on the Mechanical Behavior of Ultra High Performance Concrete[J]. Materials Reports, 2023, 37(23): 22070261-5.

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http://www.mater-rep.com/EN/10.11896/cldb.22070261 OR http://www.mater-rep.com/EN/Y2023/V37/I23/22070261

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