Effect of Fly Ash and Silica Fume Contents on Mechanical Properties of Alkali-Activated Slag-Based Concrete

XIA Dongtao; WU Chen; CUI Kai; WU Fanghong; LI Biao; WANG Yu; YU Shiting; LI Yaowei

doi:10.3969/j.issn.0258-2724.20230036

Volume 59 Issue 5

Oct. 2024

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Journal of Southwest Jiaotong University > 2024 > 59(5): 1113-1122.

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XIA Dongtao, WU Chen, CUI Kai, WU Fanghong, LI Biao, WANG Yu, YU Shiting, LI Yaowei. Effect of Fly Ash and Silica Fume Contents on Mechanical Properties of Alkali-Activated Slag-Based Concrete[J]. Journal of Southwest Jiaotong University, 2024, 59(5): 1113-1122. doi: 10.3969/j.issn.0258-2724.20230036

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Effect of Fly Ash and Silica Fume Contents on Mechanical Properties of Alkali-Activated Slag-Based Concrete

doi: 10.3969/j.issn.0258-2724.20230036

XIA Dongtao^{1, 2
,},
WU Chen¹,
CUI Kai³,
WU Fanghong⁴,
LI Biao^{1, 2
,
,},
WANG Yu¹,
YU Shiting¹,
LI Yaowei¹

1.
School of Civil Engineering, Architecture, and Environment, Hubei University of Technology, Wuhan 430068, China
2.
Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education, Hubei University of Technology, Wuhan 430068， China
3.
School of Civil Engineering, Wuhan University, Wuhan 430072, China
4.
School of Transportation, Civil Engineering & Architecture, Foshan University, Foshan 528225, China

Received Date: 06 Feb 2023
Rev Recd Date: 22 Aug 2023

Available Online: 05 Aug 2024

Publish Date: 28 Sep 2023

Abstract

Abstract

In order to study the effect of fly ash and silica fume contents on the properties of alkali-activated slag-based concrete (AASC), the changes in setting time, cubic compressive strength, cubic splitting tensile strength, flexural strength, and elastic modulus of AASC were investigated by conducting tests on setting time and basic mechanical properties. Based on the test results, a regression analysis method was used to establish the conversion relationship equation of cubic splitting tensile strength, flexural strength, and elastic modulus with cubic compressive strength, and the effect of fly ash and silica fume on the properties of AASC was revealed according to the microstructure and phase composition. The results show that the fly ash and silica fume can prolong the setting time of AASC; the mechanical property indicators of AASC tend to strengthen and then weaken with the increase in the contents of fly ash and silica fume, and the optimal contents of fly ash and silica fume are 20% and 10%, respectively. The proposed empirical formulae for cubic splitting tensile strength, flexural strength, and elastic modulus of AASC have a high fitting precision. The appropriate contents of fly ash (silica fume≤20%) and silica fume (silica fume≤10%) can promote the hydration reaction of AASC and the denser microstructures.
- alkali-activated slag-based concrete,
- fly ash,
- silica fume,
- mechanical property,
- microstructures

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References(40)

References

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