Time Variation of Mechanical Properties of Ultra-High Pumped Self-Compacting Concrete Within One Year of Age

ZHOU Ji; CHEN Zongping; TANG Jiyu; CHEN Yuliang

doi:10.3969/j.issn.0258-2724.20200746

Journal of Southwest Jiaotong University > 2022 > 57(6): 1175-1183.

ZHOU Ji, CHEN Zongping, TANG Jiyu, CHEN Yuliang. Time Variation of Mechanical Properties of Ultra-High Pumped Self-Compacting Concrete Within One Year of Age[J]. Journal of Southwest Jiaotong University, 2022, 57(6): 1175-1183. doi: 10.3969/j.issn.0258-2724.20200746

Citation:

ZHOU Ji, CHEN Zongping, TANG Jiyu, CHEN Yuliang. Time Variation of Mechanical Properties of Ultra-High Pumped Self-Compacting Concrete Within One Year of Age[J]. Journal of Southwest Jiaotong University, 2022, 57(6): 1175-1183. doi: 10.3969/j.issn.0258-2724.20200746

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Time Variation of Mechanical Properties of Ultra-High Pumped Self-Compacting Concrete Within One Year of Age

doi: 10.3969/j.issn.0258-2724.20200746

ZHOU Ji^1
,,
CHEN Zongping^{1, 2
,
,},
TANG Jiyu^{1, 3},
CHEN Yuliang⁴

1.
College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
2.
College of Architecture and Civil Engineering, Nanning University, Nanning 530200, China
3.
China Construction Eighth Engineering Division Co., Guangxi Branch, Nanning 530004, China
4.
College of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou 545006, China

Received Date: 03 Nov 2020
Rev Recd Date: 28 Feb 2021

Available Online: 08 Aug 2022

Publish Date: 02 Mar 2021

Abstract

Abstract

In order to reveal the time-varying laws of the axial compressive strength, elastic modulus and splitting tensile strength of the pumped self-compacting concrete (SCC) in super high-rise buildings during the construction period, and to provide a basis for mechanical performance analysis of super high-rise buildings in construction stage, 120 specimens, including 96 cylindrical specimens and 24 cube specimens, were fabricated by pumping the SCC of a high-rise building over 400 m, their mechanical properties were tested at different ages, and the stress-strain curves of the ultra-high pumped SCC were obtained. Based on the tested results, formulas for calculating the time-varying relationship of the mechanical properties were proposed. The results show that the ultra-high pumped SCC has good compactness under vibration-free conditions. With the increase of age, the peak stress of the ultra-high pumped SCC increases, and the peak strain is significantly greater than that of ordinary concrete. The period of early 14 d is the key stage for the growth of various properties; the elastic modulus tends to stabilize after 90 d, while the axial compressive strength and split tensile strength still increase significantly after 28 d. When the age T ≤ 60 d, the axial compressive stiffness of the ultra-high pumped SCC increases with time, while the relative toughness decreases. When T > 60 d, both of them change little and tend to be stable. The improvement of strength of the pumped SCC in super high-rise buildings can accelerate the development of its early performance, and increase the axial compressive stiffness and relative toughness. The proposed calculation formulas of time-varying mechanical properties can provide a reliable basis for prediction and evaluation of mechanical performance of the pumped SCC in super high-rise buildings.
- high-rise buildings over 400 m,
- SCC,
- construction age,
- mechanical properties,
- time-varying regularity

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References(19)

References

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