Study of the Mechanical Behavior of High-Strength Lightweight Concrete and Its Application to Bridge Pavements
Abstract
:1. Introduction
2. Experimental Tests
2.1. Materials
2.2. Mix Proportions and Strength Calculation
2.3. Uniaxial Compression Test Results of Shale Ceramsite Concrete
3. Mechanical Behavior of the HSLC Slab
3.1. Model Preparation
3.2. Analysis of Early Deformation Characteristics
3.3. Flexural Performance Test of Bridge Deck Pavement Slabs
- (1)
- Load-Deflection Behavior
- (2)
- Load–Strain Behavior
4. Field Applications
4.1. Field Instrumentations
4.2. Results Analysis
5. Conclusions
- 1.
- Physical uniaxial compression tests revealed that the compressive strength of HSLC decreases as the shale ceramsite content increases;
- 2.
- By appropriately installing and deploying FBG sensors, the deformation performance of concrete in actual engineering projects was monitored. The results indicated that the trend of shrinkage deformation of the on-site concrete was largely consistent with that observed indoors. As the concrete strength increased, its shrinkage deformation tended to stabilize. This indirectly demonstrates that the on-site concrete has good deformation stability and mechanical properties, making it suitable for normal use in field conditions;
- 3.
- According to on-site monitoring results, the shrinkage strain of the concrete was more pronounced than indoors, particularly noticeable during the first three days. Therefore, it is necessary to enhance early-stage curing of the concrete to reduce drying shrinkage deformation. Given the impact of external environmental factors and construction practices, it is reasonable to observe some differences in shrinkage deformation between indoor and outdoor lightweight aggregate concrete.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Aggregate | Mud Content(%) | Cylinder Compressive Strength (MPa) | Apparent Density (kg/m3) | Bulk Density (kg/m3) | Water Absorption (%) | Bulk Void Ratio (%) | Maximum Particle Size (mm) |
---|---|---|---|---|---|---|---|
60 min | |||||||
Shale ceramsite | 0.8 | 6.8 | 1350 | 780 | 3 | 35 | 5~20 |
No. | Gel Materials (kg) | Cement (kg) | Water–Cement Ratio | Sand Ratio | Fly Ash (kg) | Silica Fume (kg) | Water Reducer (kg) | Ceramsite Ratio | Slump (mm) | 28-Day Strength (Mean) (MPa) |
---|---|---|---|---|---|---|---|---|---|---|
① | 510 | 408 | 0.28 | 43% | 76.5 | 25.5 | 7.65 | 100% | 108 | 56.3 |
② | 510 | 408 | 0.3 | 43% | 76.5 | 25.5 | 7.65 | 100% | 164 | 55.4 |
③ | 510 | 408 | 0.32 | 43% | 76.5 | 25.5 | 7.65 | 100% | 224 | 52.5 |
④ | 510 | 408 | 0.34 | 43% | 76.5 | 25.5 | 7.65 | 100% | 245 | 41.24 |
Cement (kg/m3) | Silica Fume (kg/m3) | Fly Ash (kg/m3) | Shale Ceramsite (kg/m3) | Medium Sand (kg/m3) | Net Water Amount (kg/m3) | Water Reducer (kg/m3) | Slump (mm) |
---|---|---|---|---|---|---|---|
408 | 25.5 | 76.5 | 517.2 | 745.8 | 163.2 | 7.65 | 224 |
Specimen | Aggregate kg/m3 | Gel material kg/m3 | Additive kg/m3 | Water kg/m3 | ||||
---|---|---|---|---|---|---|---|---|
Ceramsite | Basalt | Sand | Cement | Silica Fume | Flyash | Water Reducer | ||
LWSCC-0% | / | 1015.4 | 745.8 | 408 | 25.5 | 76.5 | 7.65 | 163.2 |
LWSCC-25% | 129.3 | 761.55 | 745.8 | 408 | 25.5 | 76.5 | 7.65 | 163.2 |
LWSCC-50% | 258.6 | 507.7 | 745.8 | 408 | 25.5 | 76.5 | 7.65 | 163.2 |
LWSCC-75% | 387.9 | 253.85 | 745.8 | 408 | 25.5 | 76.5 | 7.65 | 163.2 |
LWSCC-100% | 517.2 | / | 745.8 | 408 | 25.5 | 76.5 | 7.65 | 163.2 |
No. | Initial Wavelength (nm) | kε | kT (nm/°C) |
---|---|---|---|
Strain sensor 1 | 1538.386 | 0.00712 | 0.0168 |
Strain sensor 2 | 1548.087 | 0.00712 | 0.0163 |
Strain sensor 3 | 1559.650 | 0.00712 | 0.0162 |
Temperature 1 | 1535.969 | - | 0.0097 |
Temperature 2 | 1553.737 | - | 0.0096 |
Temperature 3 | 1541.932 | - | 0.0098 |
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Song, Q.; Qin, Y.; Hou, C.; Gao, H.; Li, M. Study of the Mechanical Behavior of High-Strength Lightweight Concrete and Its Application to Bridge Pavements. Buildings 2024, 14, 2783. https://doi.org/10.3390/buildings14092783
Song Q, Qin Y, Hou C, Gao H, Li M. Study of the Mechanical Behavior of High-Strength Lightweight Concrete and Its Application to Bridge Pavements. Buildings. 2024; 14(9):2783. https://doi.org/10.3390/buildings14092783
Chicago/Turabian StyleSong, Qi, Yue Qin, Chuantan Hou, Hongwu Gao, and Mengzhao Li. 2024. "Study of the Mechanical Behavior of High-Strength Lightweight Concrete and Its Application to Bridge Pavements" Buildings 14, no. 9: 2783. https://doi.org/10.3390/buildings14092783