A Joint Experiment and Discussion for Strength Characteristics of Cemented Paste Backfill Considering Curing Conditions
Abstract
:1. Introduction
2. Experimental Materials and Methods
2.1. Materials
2.1.1. Tailings
2.1.2. Binders
2.1.3. Water
2.2. Preparation and Mix Proportion of CPB
2.3. UCS Tests
3. Results and Discussion
3.1. Influence of Curing Stress on UCS
3.2. Influence of Curing Temperature on UCS
3.3. Coupled Effects of Curing Conditions on UCS
4. Mathematical Strength Model
4.1. Establish of the Mathematical Strength Model
4.2. Comparison of Experimental Results and Theoretical Model for UCS
4.3. Verification of the Mathematical Strength Model
5. Conclusions
- (1)
- The results show that the function of quadratic polynomial with one variable can represent the correlation between the UCS and the curing stress well. Moreover, the correlation between the UCS and curing temperature shows the power function.
- (2)
- It is found that the trend of the three curves under different curing ages for the UCS are extremely similar, indicating that there exists a regular rule for the UCS with different curing conditions. The established mathematical strength model for CPB considering the curing conditions is developed.
- (3)
- The established mathematical strength model is verified by the engineering data, the prediction error between the measured UCS and the prediction UCS is less than 15%, all of the specimen points are in the range of prediction bands for 95%, indicating that the prediction results are in agreement with the experiment results under different curing ages, therefore, the established mathematical strength model is rational, which can provide some technical support for the mix proportion design of CPB.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Parameter | Al2O3 (%) | CaO (%) | FeO3 (%) | MgO (%) | P2O5 (%) | SiO2 (%) | TiO2 (%) | Na2O (%) | K2O (%) |
---|---|---|---|---|---|---|---|---|---|
Tailings | 1.04 | 44.05 | 2.89 | 5.02 | 0.18 | 43.55 | 0.35 | 0.10 | 2.82 |
OPC | 5.37 | 66.18 | 3.36 | 3.01 | 0.11 | 21.12 | 0.20 | 0.2 | 0.45 |
Curing Time (d) | Curing Temperature (°C) | UCS Growth Rate (%) | ||||||
---|---|---|---|---|---|---|---|---|
0 kPa | 90 kPa | 180 kPa | 270 kPa | 360 kPa | 450 kPa | 540 kPa | ||
7 | 20 | 0 | 49.53 | 25.63 | 18.91 | 10.88 | 5.66 | 6.79 |
35 | 0 | 53.37 | 19.78 | 11.01 | 7.44 | 5.90 | 5.81 | |
50 | 0 | 25.85 | 11.74 | 7.88 | 8.72 | 5.60 | 5.65 | |
14 | 20 | 0 | 45.27 | 22.33 | 11.41 | 9.90 | 5.59 | 4.41 |
35 | 0 | 44.64 | 16.91 | 8.88 | 7.69 | 3.68 | 5.43 | |
50 | 0 | 24.13 | 9.42 | 6.23 | 6.21 | 5.36 | 2.93 | |
28 | 20 | 0 | 38.58 | 16.48 | 7.55 | 7.60 | 4.35 | 4.17 |
35 | 0 | 35.96 | 10.08 | 7.09 | 5.56 | 3.24 | 3.14 | |
50 | 0 | 19.91 | 8.11 | 4.54 | 4.51 | 3.99 | 3.38 |
Curing Time (d) | Curing Temperature (°C) | UCS Growth Rate (%) | ||||||
---|---|---|---|---|---|---|---|---|
0 kPa | 90 kPa | 180 kPa | 270 kPa | 360 kPa | 450 kPa | 540 kPa | ||
7 | 20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
35 | 66.36 | 70.63 | 62.69 | 51.88 | 47.17 | 47.50 | 46.15 | |
50 | 82.58 | 49.82 | 39.76 | 35.81 | 37.44 | 37.05 | 36.84 | |
14 | 20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
35 | 57.43 | 56.74 | 49.81 | 46.42 | 43.48 | 40.88 | 42.25 | |
50 | 72.53 | 48.07 | 38.58 | 35.20 | 33.33 | 35.49 | 32.28 | |
28 | 20 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
35 | 48.22 | 45.42 | 37.42 | 36.84 | 34.24 | 32.81 | 31.50 | |
50 | 51.37 | 33.50 | 31.12 | 27.99 | 26.72 | 27.65 | 27.95 |
Curing Time (d) | Parameters | R2 | |||
---|---|---|---|---|---|
e | |||||
7 | 0.108 | 3.446 × 10−4 | −2.663 × 10−7 | 0.847 | 0.977 |
14 | 0.175 | 4.854 × 10−4 | −7.603 × 10−7 | 0.782 | 0.972 |
28 | 0.345 | 7.009 × 10−4 | −7.009 × 10−7 | 0.637 | 0.970 |
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Chen, S.; Wang, W.; Yan, R.; Wu, A.; Wang, Y.; Yilmaz, E. A Joint Experiment and Discussion for Strength Characteristics of Cemented Paste Backfill Considering Curing Conditions. Minerals 2022, 12, 211. https://doi.org/10.3390/min12020211
Chen S, Wang W, Yan R, Wu A, Wang Y, Yilmaz E. A Joint Experiment and Discussion for Strength Characteristics of Cemented Paste Backfill Considering Curing Conditions. Minerals. 2022; 12(2):211. https://doi.org/10.3390/min12020211
Chicago/Turabian StyleChen, Shunman, Wei Wang, Rongfu Yan, Aixiang Wu, Yiming Wang, and Erol Yilmaz. 2022. "A Joint Experiment and Discussion for Strength Characteristics of Cemented Paste Backfill Considering Curing Conditions" Minerals 12, no. 2: 211. https://doi.org/10.3390/min12020211