Research on Damage and Deterioration of Fiber Concrete under Acid Rain Environment Based on GM(1,1)-Markov
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and Mixture Proportions
2.2. Experimental Methods
2.3. Testing Procedure
3. Results and Discussion
3.1. Evaluation Parameters of Compressive Strength
3.2. Evaluation Parameters of Relative Mass
3.3. Evaluation Parameters of Relative Dynamic Elastic Modulus
3.4. Microstructure Investigation
3.5. Pore Structure
3.6. Microhardness Analysis
4. GM(1,1)-Markov Prediction Model
4.1. Derivation of the GM(1,1)-Markov Model
4.2. Analysis of Prediction Result
5. Conclusions
- (1)
- Incorporation of steel fibers and basalt fibers can play an inhibiting role in the deterioration of damage to concrete under the effect of acid rain corrosion. The best effect is achieved when the volume dose of SF is 2% and the volume dose of BF is 0.1%.
- (2)
- The microscopic test results show that the fibers share the expansion stress caused by corrosion products to a certain extent, improve the pore structure, reduce the thickness of ITZ, make the concrete micro-structure more dense, and enhance the resistance to acid rain corrosion.
- (3)
- The GM(1,1)-Markov model has a high prediction accuracy and can effectively predict the damage deterioration trend of fiber concrete, which provides a good theoretical basis for the repair and reinforcement of concrete in acid rain areas.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Material | Al2O3 | CaO | K2O | IL | MgO | MnO | SO3 | Fe2O3 | SiO2 |
---|---|---|---|---|---|---|---|---|---|
Cement | 9.2 | 50.5 | 1.2 | 1.8 | 3.3 | 0.3 | 2.1 | 4.2 | 26.5 |
Fly ash | 31.2 | 6.0 | 1.5 | 2.2 | 1.1 | 0.2 | 0.6 | 6.5 | 48.5 |
Type | Length/mm | Diameter/μm | Elastic Modulus/GPa | Tensile Strength/MPa | Density/kg·m−3 | Shape |
---|---|---|---|---|---|---|
SF | 30 | 500 | 200 | 1270 | 7800 | Wavy |
BF | 12 | 20 | 100 | 4500 | 2700 | Monofilament dispersion |
Mix | OPC | S1B0.1 | S1B0.2 | S2B0.1 | S2B0.2 |
---|---|---|---|---|---|
Cement/(kg·m−3) | 400 | 400 | 400 | 400 | 400 |
Sand/(kg·m−3) | 633 | 633 | 633 | 633 | 633 |
Stone/(kg·m−3) | 1167 | 1167 | 1167 | 1167 | 1167 |
Water/(kg·m−3) | 200 | 200 | 200 | 200 | 200 |
Fly ash/(kg·m−3) | 100 | 100 | 100 | 100 | 100 |
Superplasticizer/(kg·m−3) | 0.65 | 0.65 | 0.65 | 0.65 | 0.65 |
SF/% (by volume fraction) | / | 1.0 | 1.0 | 2.0 | 2.0 |
BF/% (by volume fraction) | / | 0.1 | 0.2 | 0.1 | 0.2 |
Compressive strength/MPa | 44.2 | 48.3 | 47.9 | 51.2 | 48.5 |
pH Value | H+ | SO42− | NH3+ | NO3− |
---|---|---|---|---|
3.0 | 1.0 × 10−3 | 1.37 × 10−3 | 2.0 × 10−4 | 1.0 × 10−3 |
Time/d | Raw Data | GM(1,1) | P(x) | GM(1,1)-Markov | |||
---|---|---|---|---|---|---|---|
Fitting Value | Relative Error | Fitting Value | Relative Error | ||||
0 | 1.0000 | 1.0000 | 0.00% | 0.0000 | + | 1.0000 | 0.00% |
20 | 1.0065 | 1.0496 | 4.28% | 0.0431 | - | 1.0169 | 1.03% |
40 | 0.9889 | 0.9788 | 1.02% | 0.0101 | + | 1.0059 | 1.72% |
60 | 0.9426 | 0.9128 | 3.16% | 0.0298 | + | 0.9353 | 0.78% |
80 | 0.8752 | 0.8513 | 2.73% | 0.0239 | + | 0.8699 | 0.60% |
100 | 0.7966 | 0.7939 | 0.33% | 0.0027 | + | 0.8094 | 1.61% |
120 | 0.7559 | 0.7404 | 2.05% | 0.0155 | + | 0.7532 | 0.36% |
140 | 0.6815 | 0.6905 | 1.32% | 0.0090 | - | 0.6799 | 0.24% |
160 | 0.6350 | 0.6439 | 1.41% | 0.0089 | - | 0.6351 | 0.02% |
180 | 0.5910 | 0.6005 | 1.61% | 0.0095 | - | 0.5932 | 0.38% |
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Yu, J.; Qiao, H.; Zhu, F.; Wang, X. Research on Damage and Deterioration of Fiber Concrete under Acid Rain Environment Based on GM(1,1)-Markov. Materials 2021, 14, 6326. https://doi.org/10.3390/ma14216326
Yu J, Qiao H, Zhu F, Wang X. Research on Damage and Deterioration of Fiber Concrete under Acid Rain Environment Based on GM(1,1)-Markov. Materials. 2021; 14(21):6326. https://doi.org/10.3390/ma14216326
Chicago/Turabian StyleYu, Jianqiao, Hongxia Qiao, Feifei Zhu, and Xinke Wang. 2021. "Research on Damage and Deterioration of Fiber Concrete under Acid Rain Environment Based on GM(1,1)-Markov" Materials 14, no. 21: 6326. https://doi.org/10.3390/ma14216326