Influence of Restrained Condition on Mechanical Properties, Frost Resistance, and Carbonation Resistance of Expansive Concrete
Abstract
:1. Introduction
2. Experimental Program
2.1. Experimental Materials and Mix Proportions
2.2. Test Methods
2.2.1. Length Change Ratio and Expansion Strain Tests
2.2.2. Mercury Intrusion Porosimetry Test
2.2.3. Underwater Weighing Test
2.2.4. Compressive Strength Test
2.2.5. Freeze–thaw Test
2.2.6. Accelerated Carbonation Test
3. Results and Discussion
3.1. Fresh Concrete
3.2. Length Change Ratio and Expansion
3.3. Pore Structure
3.4. Total Porosity
3.5. Compressive Strength of Concrete
3.6. Frost Resistance of Concrete
3.7. Carbonation Depth of Concrete
4. Conclusions
- (1)
- The length change ratio and expansion strain of concrete with and without an expansive additive were controlled by the restrained condition.
- (2)
- Under the restrained condition, the pore size distribution of the expansive mortar shifted to a smaller size, which can be explained by two hypotheses. First, the microspore in the cement–expansive paste is filled with crystal ettringite. Second, the effect of chemical stress is caused by the expansive additive hydration.
- (3)
- The total porosity of the expansive concrete was decreased by the restraining when the amount of EX was 40 kg/m3 of concrete at a w/b ratio of 0.5. The compressive strength of the restrained concrete was 12% higher than that of the unrestrained concrete at 28 days.
- (4)
- The enhanced frost resistance of the expansive concrete was clearly observed at the w/b ratio of 0.3. However, at the w/b ratio of 0.5, the frost resistance of the expansive concrete was enhanced by restraining for EX40.
- (5)
- The concrete carbonation depth was not observed at the w/b ratio of 0.3. For the w/b of 0.5, the carbonation resistance of the expansive concrete was improved by restraining.
- (6)
- It is essential considering the effect of the restrained conditions in evaluating the various experimental results of the expansive concrete with a large expansive additive dosage (i.e., over 20 kg/m3 concrete) or concrete combining EX with other cement replacement materials (e.g., fly ash and blast furnace slag).
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Materials | Symbol | Properties |
---|---|---|
Ordinary Portland cement | C | Density: 3.15 g/cm3; Specific surface area: 3490 cm2/g |
Expansive additive | EX | Ettringite-gypsum type; Density: 3.05 g/cm3; Specific surface area: 3260 cm2/g |
Coarse aggregate | G | Density: 2.68 g/cm3; Absorption: 2.17% |
Fine aggregate | S | Density: 2.68 g/cm3; Absorption: 1.78% |
Water | W | Tap water |
Admixtures | Ads | w/b 0.5: AE water-reducing agent (Master Pozzolith No. 70) w/b 0.3: High-performance water-reducing agents (SP8SV) and AE agent (Master air 101) |
Series | Symbol | w/b | Unit Weight, kg/m3 | Ads | ||||
---|---|---|---|---|---|---|---|---|
W | C | EX | S | A | ||||
Series 1 | OPC | 0.3 | 175 | 583 | − | 616 | 981 | SP8SV (B × 1.2%) Master air 101 (B × 0.001%) |
EX20 | 563 | 20 | ||||||
EX40 | 543 | 40 | ||||||
Series 2 | OPC | 0.5 | 185 | 370 | − | 855 | 959 | No. 70 (250 mL/B = 100 kg) |
EX20 | 350 | 20 | ||||||
EX40 | 330 | 40 |
Series | Sample | w/b | Slump (cm) | Flow (cm) | Air Content (%) | |
---|---|---|---|---|---|---|
Series 1 | OPC | 0.3 | − | 66 | 4.7 | 19.5 |
EX20 | − | 65.5 | 5.5 | 19.5 | ||
EX40 | − | 66 | 5.8 | 20 | ||
Series 2 | OPC | 0.5 | 20 | − | 4.8 | 15.0 |
EX20 | 19.4 | − | 4.9 | 15.5 | ||
EX40 | 19.5 | − | 4.9 | 16.2 |
Sample | w/b 0.3 | w/b 0.5 | ||
---|---|---|---|---|
Unrestrained | Restrained | Unrestrained | Restrained | |
OPC | 28.11 | 24.28 | 35.95 | 33.28 |
EX20 | 30.77 | 26.05 | 33.89 | 33.89 |
EX40 | 28.26 | 26.24 | 48.38 | 40.81 |
Sample | w/b 0.3 | w/b 0.5 | ||
---|---|---|---|---|
Unrestrained | Restrained | Unrestrained | Restrained | |
OPC | 0 | 0 | 1.15 | 0.95 |
EX20 | 0 | 0 | 2.90 | 1.78 |
EX40 | 0 | 0 | 3.60 | 2.80 |
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Duc Van, N.; Kuroiwa, E.; Kim, J.; Choi, H.; Hama, Y. Influence of Restrained Condition on Mechanical Properties, Frost Resistance, and Carbonation Resistance of Expansive Concrete. Materials 2020, 13, 2136. https://doi.org/10.3390/ma13092136
Duc Van N, Kuroiwa E, Kim J, Choi H, Hama Y. Influence of Restrained Condition on Mechanical Properties, Frost Resistance, and Carbonation Resistance of Expansive Concrete. Materials. 2020; 13(9):2136. https://doi.org/10.3390/ma13092136
Chicago/Turabian StyleDuc Van, Nguyen, Emika Kuroiwa, Jihoon Kim, Hyeonggil Choi, and Yukio Hama. 2020. "Influence of Restrained Condition on Mechanical Properties, Frost Resistance, and Carbonation Resistance of Expansive Concrete" Materials 13, no. 9: 2136. https://doi.org/10.3390/ma13092136