Improving Strength and Structure of Backfill Material with Silica Fume
Author Information
Author(s): Shao Xiaoping, Wang Zhengchun, Tang Renlong, Zhao Bingchao, Ning Jianbo, Tian Chuang, Wang Wei, Zhang Yibo, Du Xing
Primary Institution: Xi’an University of Science and Technology
Hypothesis
Can silica fume enhance the medium-term strength and microstructure of fly ash-cement paste backfill?
Conclusion
Using 5% silica fume significantly improves the medium-term strength of backfill material while maintaining reasonable flowability.
Supporting Evidence
- Increasing silica fume content improves medium-term strength up to 5%.
- Excessive silica fume reduces flowability and strength.
- Optimal silica fume content leads to better microstructure.
- Silica fume enhances the formation of calcium silicate hydrate gel.
Takeaway
Adding silica fume to backfill material helps it become stronger and better structured, but too much can make it weaker.
Methodology
The study tested different amounts of silica fume in fly ash-cement paste to analyze its effects on flowability, strength, and microstructure.
Limitations
The study primarily focused on short-term effects and did not explore long-term durability.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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