Study on the Preparation and Properties of Bridge Concrete Using Low Carbon Aggregates
2. Materials and Methods
2.2. Mix Proportion
2.3. Test Method
2.3.2. Mechanical Properties
2.3.3. Chloride Ion Permeability Resistance
2.3.4. Freeze–Thaw Resistance
2.3.5. The Air-Void Parameters
- − Spacing factor L (mm).
- − Specific surface α (mm−1).
- − Air content A (%).
3. Results and Discussion
3.2. Mechanical Properties
3.3. Chloride Ion Permeability Resistance
3.4. Frost Resistance and Air-Void Parameters
- Low carbon aggregates from tunnel muck affects the workability of fresh concrete through its characteristics and the changes in air content in fresh concrete. Therefore, the mix ratio should be optimized to obtain concrete prepared using low carbon aggregate with a better working performance in actual engineering applications.
- The GM specimens show higher compressive strength. At 90 d, the compressive strength of GM was 14.6% higher than that of GR. The flexural strength of concrete prepared with manufactured sand is basically equivalent to that with natural sand. Compared to the GR specimens, the splitting tensile strength of GM decreased by 15%~20%. In addition, low carbon aggregates from tunnel muck reduces concrete’s elastic modulus because of the low elastic modulus of coarse granite aggregate; the elastic modulus of the GM specimens is 26.3% lower than those of LM at 5 d.
- The ability to resist chloride ion penetration in concrete prepared using manufactured sand is better. Compared with river sand (GR), the electric flux and chloride ion diffusion coefficient of the specimens with granite manufactured sand (GM) decreased by 30% and 24.6%, respectively.
- Concrete specimens with low carbon aggregates show better frost resistance properties. The concrete with the limestone aggregate (LM) could withstand the freeze–thaw cycle 150 times; however, the concrete samples with low carbon aggregates (GM or GR) could withstand the freeze–thaw cycle 300 times, indicating that low carbon aggregates can be used in special service environments.
- In actual projects, low carbon aggregates prepared from tunnel muck can be used to prepare high-strength, high-performance, and durable concrete that meets the requirements of the project by controlling the quality of the granite manufactured sand and selecting a reasonable mix ratio.
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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|Standard Consistency Water Consumption/%||Setting Time/h||Flexural Strength/MPa||Compressive Strength/MPa||SO3 Content/%||Other Substances/%|
|Initial||Final||3 d||28 d||3 d||28 d|
|Type||Accumulated Screen Residue/%||Fineness Modulus||<75 μm Content/%||Water Absorption/%|
|Sample||Coarse Aggregate||Sand||Content (kg/m3)|
|Cement||Fly Ash||Sand||Aggregate||Water||Water Reducer|
|Specimens||A (%)||α (mm−1)||L (mm)|
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Jiang, R.; Xing, Y.; Liu, S.; Guo, Y.; Guo, B. Study on the Preparation and Properties of Bridge Concrete Using Low Carbon Aggregates. Materials 2023, 16, 245. https://doi.org/10.3390/ma16010245
Jiang R, Xing Y, Liu S, Guo Y, Guo B. Study on the Preparation and Properties of Bridge Concrete Using Low Carbon Aggregates. Materials. 2023; 16(1):245. https://doi.org/10.3390/ma16010245Chicago/Turabian Style
Jiang, Ruishuang, Youjia Xing, Shuai Liu, Yongzhi Guo, and Baolin Guo. 2023. "Study on the Preparation and Properties of Bridge Concrete Using Low Carbon Aggregates" Materials 16, no. 1: 245. https://doi.org/10.3390/ma16010245