Effect of PCE on Properties of MMA-Based Repair Material for Concrete
Abstract
:1. Introduction
2. Materials and Methods
2.1. Raw Materials
2.2. Preparation of the MMA-Based Repair Material
2.3. Testing Procedures
2.3.1. Viscosity
2.3.2. Shrinkage
- S: the shrinkage of the sample, %;
- m1: the quality of the sample after curing, g;
- V1: the volume of the sample after curing, mL;
- m01: the mass of the small tube, g;
- m02: the mass of the small test tube + the sample, g;
- V2: the volume of the small test tube, mL.
2.3.3. Bending Strength
- fm: the ultimate bending strength of the material, MPa;
- Fmax: the maximum load of bending failure of the material, N;
- L: the distance of force between two points of the material, m;
- b: the width of the section of the material specimen, m;
- h: the height of the section of the material specimen, m.
2.3.4. Durability
3. Results and Discussion
3.1. Viscosity
3.2. Shrinkage
3.3. Bending Strength
3.4. Ultraviolet Aging Resistance
3.5. Chemical Corrosion Resistance
3.6. Thermal Shock Aging Resistance
3.7. Thermal Shock Aging Resistance
4. Conclusions
- The addition of PCE can hinder the polymerization reaction of the system to a certain extent, and make the reaction rate slow down.
- The addition of CaCO3 can effectively reduce the shrinkage of the MMA-based repair material, and this can also increase the viscosity of the repair material. The viscosity of the material is approximately 500 mPa·s, and the shrinkage ratio can be reduced to approximately 10% when CaCO3 with a mass fraction of 30% is added.
- The MMA and MMA modified by PCE repair materials both have good mechanical properties, and the bending strength at 28 days can reach up to 28.38 MPa and 29.15 MPa, respectively. The bending strength decreased after the addition of CaCO3, and the largest decrease was approximately 25%, when CaCO3 with a mass fraction of 50% was added.
- The present study revealed that the durability of MMA and MMA modified by PCE repair materials is good. After the addition of HS-770 light stabilizer with a mass fraction of 0.4%, the retention ratios for the bending strength of materials with the ratios of P0 and P3 after 1440 h of ultraviolet irradiation could reach up to 91.11% and 89.94%, respectively. The retention ratios for the bending strength of the two ratios of P0 and P3 could reach above 95% after soaking in the NaCl solution with a mass fraction of 5%, and the MgSO4 solution with a mass fraction of 5%, for 90 days. After the addition of the polypropylene fiber with a mass fraction of 1.5%, the retention ratios for the bending strength of the two ratios of P0 and P3 after 300 thermal shock cycles could reach up to 87.01% and 86.74%, respectively. Furthermore, the retention ratios for the bending strength of the two ratios of P0 and P3 could reach up to 97.29% and 95.13%, respectively, after 200 freeze-thaw cycles.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Content of CaCO3% ≥ | Content of Moisture% ≤ | Content of Fe2O3% ≤ | Content of SiO2% ≤ | Average Size/μm | Specific Surface Area cm2/g ≤ | Whiteness ≥ |
---|---|---|---|---|---|---|
98.80 | 0.40 | 0.02 | 0.01 | 4.20 | 16,000.00 | 94.00 |
NO. | MMA/g | Initiator/g | Plasticizer/g | Accelerator/g | PCE/g |
---|---|---|---|---|---|
P0 | 100.00 | 0.60 | 30.00 | 0.60 | 0 |
P1 | 100.00 | 0.60 | 30.00 | 0.60 | 5.00 |
P2 | 100.00 | 0.60 | 30.00 | 0.60 | 7.50 |
P3 | 100.00 | 0.60 | 30.00 | 0.60 | 10.00 |
P4 | 100.00 | 0.60 | 30.00 | 0.60 | 12.50 |
P5 | 100.00 | 0.60 | 30.00 | 0.60 | 15.00 |
Proportion of CaCO3/% | 0 | 10 | 20 | 30 | 40 | 50 |
---|---|---|---|---|---|---|
Viscosity of P0/mPa·s | 90 | 160 | 290 | 460 | 580 | 760 |
Viscosity of P3/mPa·s | 80 | 170 | 310 | 500 | 610 | 750 |
NO. | Three Days Weight Gain/% | 90 Days Weight Gain/% | ||||
---|---|---|---|---|---|---|
Clear Water | 5%NaCl Solution | 5%MgSO4 Solution | Clear Water | 5%NaCl Solution | 5%MgSO4 Solution | |
Blank sample | 1.24 | 1.13 | 1.37 | 12.79 | 2.72 | 3.82 |
P0 | 0.47 | 0.34 | 0.41 | 3.03 | 1.34 | 1.72 |
P3 | 0.42 | 0.37 | 0.39 | 3.12 | 1.27 | 1.81 |
NO. | Bending Strength Retention Ratio/% | ||
---|---|---|---|
Clear Water | 5%NaCl Solution | 5%MgSO4 Solution | |
P0 | 98.27 | 97.34 | 98.38 |
P3 | 96.62 | 96.13 | 99.12 |
NO. | Initial Bending Strength/MPa | Bending Strength after Thermal Shock/MPa | Strength Retention Ratio/% |
---|---|---|---|
P0 | 28.38 | 18.55 | 65.36 |
P3 | 29.15 | 17.85 | 61.23 |
Ratio | Freeze Thaw Cycles Zero Times | Freeze Thaw Cycles 50 Times | Freeze Thaw Cycles 200 Times | ||
---|---|---|---|---|---|
Bending Strength/MPa | Bending Strength/MPa | Bending Strength Retention Ratio/% | Bending Strength/MPa | Bending Strength Retention Ratio/% | |
P0 | 28.38 | 28.04 | 98.8 | 27.61 | 97.29 |
P3 | 29.15 | 29.02 | 99.55 | 27.73 | 95.13 |
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Han, J.; Xu, L.; Feng, T.; Shi, X.; Zhang, P. Effect of PCE on Properties of MMA-Based Repair Material for Concrete. Materials 2021, 14, 859. https://doi.org/10.3390/ma14040859
Han J, Xu L, Feng T, Shi X, Zhang P. Effect of PCE on Properties of MMA-Based Repair Material for Concrete. Materials. 2021; 14(4):859. https://doi.org/10.3390/ma14040859
Chicago/Turabian StyleHan, Jian, Lingling Xu, Tao Feng, Xin Shi, and Pan Zhang. 2021. "Effect of PCE on Properties of MMA-Based Repair Material for Concrete" Materials 14, no. 4: 859. https://doi.org/10.3390/ma14040859