The Effects of Diatomite as an Additive on the Macroscopic Properties and Microstructure of Concrete
Abstract
:1. Introduction
2. Experiments
2.1. Materials
2.2. Mix Proportion and Sample Preparation
2.2.1. Mix Proportion
2.2.2. Preparation of Samples
2.2.3. Curing Conditions
2.3. Test Procedures
2.3.1. Slump
2.3.2. Water Absorption
2.3.3. Compressive Strength
2.3.4. Coulomb Electric Flux
2.3.5. Mercury Intrusion Porosimetry (MIP)
2.3.6. Thermogravimetry
2.3.7. Fourier Transform Infrared Spectroscopy (FTIR)
2.3.8. Scanning Electron Microscope (SEM)
3. Results and Discussion
3.1. Physical and Mechanical Properties
3.1.1. Slump and Water Absorption
3.1.2. Compressive Strength at Different Curing Ages
3.2. Resistance of Concrete to Chloride Penetration
3.3. Effect of Diatomite on the Pore Structure of Concrete
3.4. Effect of Diatomite on the Microstructure of Concrete
3.4.1. TG Analysis
3.4.2. FTIR Analysis
3.4.3. SEM Analysis
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Chemical Material | CaO | SiO2 | Al2O3 | Fe2O3 | MgO | K2O | TiO2 | SO3 | Others |
---|---|---|---|---|---|---|---|---|---|
Cement | 69.89 | 17.30 | 3.14 | 3.76 | 2.09 | 0.64 | 0.18 | 2.25 | 0.75 |
Diatomite | 0.31 | 89.31 | 1.68 | 1.50 | 0.15 | 0.40 | 0.17 | 0.05 | 1.45 |
Particle Size (μm) | SiO2 Content (%) | Permeability | Ignition Loss (%) | Bulk Density (g/cm3) | PH |
---|---|---|---|---|---|
<100 | 89.3 | 3.0 | 0.3 | 0.3–0.4 | 9.8 |
Sample | Water (kg) | Cement (kg) | Diatomite (kg) | Sand (kg) | Aggregate (kg) | Water Reducer (kg) | Production (Group) |
---|---|---|---|---|---|---|---|
OPC | 176 | 440.0 | 0.0 | 678.0 | 1106.0 | 4.4 | 6 |
DC3 | 176 | 426.8 | 13.2 | 678.0 | 1106.0 | 4.4 | 6 |
DC5 | 176 | 418.0 | 22.0 | 678.0 | 1106.0 | 4.4 | 6 |
DC7 | 176 | 409.2 | 30.8 | 678.0 | 1106.0 | 4.4 | 6 |
CODE | Compressive Strength (MPa) | Variation vs. OPC (MPa) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
3 | 7 | 14 | 28 | Aa | 3 | 7 | 14 | 28 | ||
1 | OPC | 41.6 | 49.3 | 51.6 | 58.9 | 70.6 | - | - | - | - |
2 | DC3 | 45.0 | 49.7 | 54.3 | 59.3 | 75.9 | 3.4 | 0.4 | 2.7 | 0.4 |
3 | DC5 | 46.1 | 50.2 | 56.3 | 59.4 | 77.6 | 4.5 | 0.9 | 4.7 | 0.5 |
4 | DC7 | 39.0 | 45.5 | 48.6 | 54.8 | 71.2 | −2.6 | −3.8 | −3.0 | −4.1 |
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Li, C.; Li, G.; Chen, D.; Gao, K.; Cao, Y.; Zhou, Y.; Mao, Y.; Fan, S.; Tang, L.; Jia, H. The Effects of Diatomite as an Additive on the Macroscopic Properties and Microstructure of Concrete. Materials 2023, 16, 1833. https://doi.org/10.3390/ma16051833
Li C, Li G, Chen D, Gao K, Cao Y, Zhou Y, Mao Y, Fan S, Tang L, Jia H. The Effects of Diatomite as an Additive on the Macroscopic Properties and Microstructure of Concrete. Materials. 2023; 16(5):1833. https://doi.org/10.3390/ma16051833
Chicago/Turabian StyleLi, Chunqing, Guoyu Li, Dun Chen, Kai Gao, Yapeng Cao, Yu Zhou, Yuncheng Mao, Shanzhi Fan, Liyun Tang, and Hailiang Jia. 2023. "The Effects of Diatomite as an Additive on the Macroscopic Properties and Microstructure of Concrete" Materials 16, no. 5: 1833. https://doi.org/10.3390/ma16051833