scholarly journals Investigation of inhomogeneous properties of backfill samples to explore a new quantitative criterion for cemented paste backfill identification

2021 ◽  
Author(s):  
Xiaopeng Peng ◽  
Li Jie Guo ◽  
Guangsheng Liu ◽  
Xiaocong Yang ◽  
C Wan
Keyword(s):  
Cemented Paste Backfill ◽  
Quantitative Criterion ◽  
Paste Backfill ◽  
Inhomogeneous Properties

Effects of temperatures and pH values on rheological properties of cemented paste backfill

2021 ◽  
Vol 28 (6) ◽  
pp. 1707-1723
Author(s):  
Qin-li Zhang ◽  
Yi-teng Li ◽  
Qiu-song Chen ◽  
Yi-kai Liu ◽  
Yan Feng ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Cemented Paste Backfill ◽  
Ph Values ◽  
Paste Backfill

Recycling flue gas desulfurisation gypsum and phosphogypsum for cemented paste backfill and its acid resistance

2021 ◽  
Vol 275 ◽  
pp. 122170
Author(s):  
Shiyu Zhang ◽  
Yingliang Zhao ◽  
Hangxing Ding ◽  
Jingping Qiu ◽  
Zhenbang Guo
Keyword(s):  
Flue Gas ◽  
Acid Resistance ◽  
Cemented Paste Backfill ◽  
Paste Backfill

scholarly journals Strengthening Behavior of Cemented Paste Backfill Using Alkali-Activated Slag Binders and Bottom Ash Based on the Response Surface Method

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 855
Author(s):  
Qi Sun ◽  
Xueda Wei ◽  
Tianlong Li ◽  
Lu Zhang
Keyword(s):  
Response Surface ◽  
Bottom Ash ◽  
Hydration Product ◽  
Cemented Paste Backfill ◽  
Alkali Activated Slag ◽  
Surface Method ◽  
Optimal Mix ◽  
Paste Backfill ◽  
Activated Slag ◽  
Alkali Activated

A new type of cemented paste backfill (CPB) was prepared by using the bottom ash (BA) from a thermal power plant as an aggregate, alkali-activated slag as a binder, and an air-entraining agent as an admixture. Based on the central composite design (CCD) response surface method, the mix ratio was optimized, and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) was performed on the optimal mix ratio. ImageJ software was utilized to determine the porosity of the experimental samples at various curing ages. The results indicate that the optimal mix ratio of the aggregate-binder ratio is 3.28, the alkali dosage is 3%, the solid content is 67.44%, and the air-entraining agent dosage is 0.1%. As the curing age increases, the porosity of CPB gradually decreases. A calcium aluminosilicate hydrate (C-A-S-H) gel is the main hydration product of alkali-activated slag. At the beginning of the hydration reaction, the slag gradually dissolves, and the C-A-S-H product binds the BA together. At 14 d, complete calcium hydroxide (CH) crystals appeared in the hydration product. Finally, the degree of C-A-S-H crystallization increased further to form a dense structure.

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