Experimental Study on High-Temperature Damage Repair of Concrete by Soybean Urease Induced Carbonate Precipitation
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Preparation and Treatment of Specimen
2.2.1. Specimen Preparation
2.2.2. High-Temperature Treatment
2.3. Test Methods
2.3.1. Extraction of Soybean Urease
2.3.2. Different Repair Methods
2.3.3. SEM and EDS Experiments
2.3.4. Surface Film Thickness
2.3.5. Infrared Thermal Image
2.3.6. Water Absorption Test
2.3.7. Compressive Strength Test
2.3.8. Specimens’ Information
3. Results and Discussion
3.1. Apparent Characteristics
3.2. EDS Analysis
3.3. SEM Analysis
3.4. Surface Film Thickness
3.5. Average Infrared Temperature Increase
3.6. Water Absorption
3.7. Compressive Strength
4. Conclusions
- (1)
- From the results of EDS and SEM, CaC2O4 and CaCO3 crystals are formed, CaCO3 crystals are larger, and the depose effect is better; these two kinds of crystals make the concrete denser.
- (2)
- From the results of apparent characteristics, surface film thickness, and average infrared temperature increase, SICP has a good effect on the surface repair of high-temperature damage of concrete; the repair effect of the negative pressure method is slightly better than that of the immersion method.
- (3)
- From the results of water absorption and compressive strength, SICP has a certain effect on the recovery of mechanical properties and durability of damaged concrete; the repair effect of the negative pressure method is obviously better than that of the immersion method.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Cement (kg/m3) | Water (kg/m3) | Aggregate (kg/m3) | Sand (kg/m3) | Superplasticizer (kg/m3) | w/b | Slump (mm) |
---|---|---|---|---|---|---|
430 | 165 | 1130 | 720 | 1.15 | 0.38 | 152 |
Test | Sample Size (mm) | Repair Methods | Damage Temperature (°C) | Repair Time (h) |
---|---|---|---|---|
Apparent characteristics | 40 × 40 × 40 | Negative pressure method | 600 | 72 |
EDS | White sediments from the surface of repaired specimen | Negative pressure method | 600 | 72 |
SEM | Small blocks from the interior of repaired specimens | Immersion and negative pressure methods | 600 | 72 |
Surface film thickness | 40 × 40 × 40 | Immersion and negative pressure methods | 300, 400, 500, 600 | 24, 48, 72 |
Infrared thermal image | 40 × 40 × 40 | Immersion and negative pressure methods | 300, 400, 500, 600 | 72 |
Water absorption | 40 × 40 × 40 | Immersion and negative pressure methods | 300, 400, 500, 600 | 72 |
Compressive strength | 40 × 40 × 40 | Immersion and negative pressure methods | 300, 400, 500, 600 | 72 |
Sample | C | O | Ca | Total |
---|---|---|---|---|
upper | 28.08 | 57.82 | 14.10 | 100 |
bottom | 18.82 | 64.03 | 17.14 | 100 |
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Wei, H.; Fan, Y.; Sun, L.; Du, H.; Liang, R. Experimental Study on High-Temperature Damage Repair of Concrete by Soybean Urease Induced Carbonate Precipitation. Materials 2022, 15, 2436. https://doi.org/10.3390/ma15072436
Wei H, Fan Y, Sun L, Du H, Liang R. Experimental Study on High-Temperature Damage Repair of Concrete by Soybean Urease Induced Carbonate Precipitation. Materials. 2022; 15(7):2436. https://doi.org/10.3390/ma15072436
Chicago/Turabian StyleWei, Hong, Yanan Fan, Lei Sun, Hongxiu Du, and Renwang Liang. 2022. "Experimental Study on High-Temperature Damage Repair of Concrete by Soybean Urease Induced Carbonate Precipitation" Materials 15, no. 7: 2436. https://doi.org/10.3390/ma15072436