Mechanical and Durability Performance Improvement of Natural Hydraulic Lime-Based Mortars by Lithium Silicate Solution
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Preparation
2.3. Test Methods
3. Results and Discussion
3.1. The Effect on Mechanical Properties
3.2. The Effect on Air Permeability
3.3. Effect of LS on Water Absorption of NHL-Based Mortar
3.4. The Analysis of Morphology
3.5. Effect of LS Pretreatment on FTC Resistance
3.6. Pore Structures
3.7. TG Analysis Results
4. Conclusions
- The NHL-based mortar’s compressive strength can be improved after being impregnated in LS solution for 8 h. The growth rate of compressive strength was maintained between 32.7% and 52.0%.
- After spraying LS on the sample’s surface (about 0.2 kg/m2), the surface hardness increased by up to 10 grades.
- The sample surface was densified by LS, and the FTC resistance was improved. In particular, compared with the control samples after 30 FTC tests, the weight loss of sample N1-3, N2-3, and N3-3 decreased by 43.0%, 31.6%, and 43.8%, respectively.
- LS can consume existing or newly generated CH to form C-S-H, which refines the NHL-based mortar’s pore structure, leading to a decrease in API value and water absorption.
Author Contributions
Funding
Conflicts of Interest
References
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Chemical Composition | SiO2 | CaO | Fe2O3 | MgO | Al2O3 |
---|---|---|---|---|---|
NHL2 | 9.48 | 78.66 | 1.98 | 4.51 | 3.12 |
Samples | Composition of Mixture (kg/m3) | LS Concentration (%) | ||||
---|---|---|---|---|---|---|
Sand/NHL2 | Water/NHL2 | NHL2 | Sand | Water | ||
N1-0 | 1:1 | 0.5 | 450 | 450 | 225 | 0 |
N1-1 | 5 | |||||
N1-2 | 10 | |||||
N1-3 | 15 | |||||
N2-0 | 2:1 | 0.5 | 450 | 900 | 225 | 0 |
N2-1 | 5 | |||||
N2-2 | 10 | |||||
N2-3 | 15 | |||||
N3-0 | 3:1 | 0.5 | 450 | 1350 | 225 | 0 |
N3-1 | 5 | |||||
N3-2 | 10 | |||||
N3-3 | 15 |
Concentration of LS | Group N1 | Group N2 | Group N3 |
---|---|---|---|
0% | 25.58 | 29.84 | 37.71 |
5.0% | 23.58 | 29.20 | 36.72 |
10.0% | 23.11 | 28.38 | 34.72 |
15.0% | 20.12 | 26.38 | 31.83 |
Group | Samples | Water Bound to C-S-H | CH | CC |
---|---|---|---|---|
N1 | N1-0 | 3.4 | 31.4 | 24.5 |
N1-1 | 4.6 | 28.3 | 23.3 | |
N1-2 | 4.8 | 26.5 | 19.2 | |
N1-3 | 5.3 | 23.1 | 21.0 | |
N2 | N2-0 | 3.5 | 32.4 | 24.6 |
N2-1 | 4.3 | 29.2 | 23.7 | |
N2-2 | 4.5 | 27.3 | 19.8 | |
N2-3 | 5.2 | 23.8 | 18.0 | |
N3 | N2-0 | 3.3 | 32.3 | 24.0 |
N2-1 | 4.7 | 29.3 | 23.0 | |
N2-2 | 4.6 | 27.4 | 19.1 | |
N2-3 | 5.3 | 24.1 | 18.2 |
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Song, Z.; Lu, Z.; Lai, Z. Mechanical and Durability Performance Improvement of Natural Hydraulic Lime-Based Mortars by Lithium Silicate Solution. Materials 2020, 13, 5292. https://doi.org/10.3390/ma13225292
Song Z, Lu Z, Lai Z. Mechanical and Durability Performance Improvement of Natural Hydraulic Lime-Based Mortars by Lithium Silicate Solution. Materials. 2020; 13(22):5292. https://doi.org/10.3390/ma13225292
Chicago/Turabian StyleSong, Zijian, Zhongyuan Lu, and Zhenyu Lai. 2020. "Mechanical and Durability Performance Improvement of Natural Hydraulic Lime-Based Mortars by Lithium Silicate Solution" Materials 13, no. 22: 5292. https://doi.org/10.3390/ma13225292