Effects of Expansive Agents on the Early Hydration Kinetics of Cementitious Binders
Abstract
:1. Introductions
2. Materials and Methods
2.1. Materials
2.2. Test Methods
2.3. Early Hydration Kinetics
3. Results and Discussion
3.1. Characteristics of Early Hydration Heat of Composite Binders
3.2. Analysis of Early Hydration Kinetic Parameters
3.3. Mechanical Properties and Deformation of Mortars
3.4. Comparisons with Other Expansive Cementitious Binders
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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Materials | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | SO3 | Na2Oeq | f-CaO | LOI |
---|---|---|---|---|---|---|---|---|---|
Cement | 21.62 | 4.35 | 3.45 | 64.40 | 3.45 | 2.25 | 0.50 | 0.90 | 1.25 |
Fly ash | 46.89 | 24.53 | 13.55 | 1.35 | 2.07 | 0.63 | 1.57 | - | 5.68 |
Slag | 32.70 | 14.03 | 0.50 | 39.00 | 8.99 | 0.20 | 0.52 | - | 0.78 |
ZY | 7.24 | 13.66 | 2.23 | 32.13 | 2.50 | 33.71 | 0.12 | - | 6.83 |
Sample | W/B | Cement | Fly Ash | Slag | ZY-type™ Expansive Agent |
---|---|---|---|---|---|
Cement | 0.4 | 100 | 0 | 0 | 0 |
Cement + ZY | 0.4 | 94 | 0 | 0 | 6 |
FA20 | 0.4 | 74 | 20 | 0 | 6 |
FA40 | 0.4 | 54 | 40 | 0 | 6 |
BS20 | 0.4 | 74 | 0 | 20 | 6 |
BS40 | 0.4 | 54 | 0 | 40 | 6 |
Samples | n | K1′ | K2′ | K3′ | Kinetics Mechanism |
---|---|---|---|---|---|
Cement | 1.946 | 0.0489 | 0.0133 | 0.00269 | NG-I-D |
Cement + ZY | 1.818 | 0.0451 | 0.0121 | 0.00266 | NG-I-D |
FA 20 | 1.792 | 0.0417 | 0.0105 | 0.00216 | NG-I-D |
FA 40 | 1.741 | 0.0386 | 0.00961 | 0.00201 | NG-I-D |
BS 20 | 1.788 | 0.0404 | 0.00955 | 0.00191 | NG-I-D |
BS 40 | 1.649 | 0.0332 | 0.00715 | 0.00147 | NG-I-D |
Samples | 3 d | 7 d | 28 d | 90 d |
---|---|---|---|---|
Cement | 28.5 | 37.7 | 54.2 | 64.9 |
Cement + ZY | 35.2 | 42.2 | 59.8 | 69.0 |
FA 20 | 23.7 | 34.6 | 50.4 | 58.2 |
FA 40 | 21.1 | 28.2 | 39.7 | 51.7 |
BS 20 | 25.9 | 35.3 | 53.9 | 63.7 |
BS 40 | 25.4 | 32.2 | 49.9 | 59.3 |
Study | Expansive Agent | Early Hydration Kinetics | Technical Use * |
---|---|---|---|
Cao et al. [19] | MgO | n.a. | Yes |
Winnefeld et al. [27] | CaSO4 | n.a. | Yes |
Wang et al. [28] | Sewage sludge | NG-D | Yes |
Our study | ZY-type™ | NG-I-D | Yes |
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Miao, M.; Liu, Q.; Zhou, J.; Feng, J. Effects of Expansive Agents on the Early Hydration Kinetics of Cementitious Binders. Materials 2019, 12, 1900. https://doi.org/10.3390/ma12121900
Miao M, Liu Q, Zhou J, Feng J. Effects of Expansive Agents on the Early Hydration Kinetics of Cementitious Binders. Materials. 2019; 12(12):1900. https://doi.org/10.3390/ma12121900
Chicago/Turabian StyleMiao, Miao, Qingyang Liu, Jian Zhou, and Jingjing Feng. 2019. "Effects of Expansive Agents on the Early Hydration Kinetics of Cementitious Binders" Materials 12, no. 12: 1900. https://doi.org/10.3390/ma12121900