Experimental Investigation into Lightweight High Strength Concrete with Shale and Clay Ceramsite for Offshore Structures
Abstract
:1. Introduction
2. Raw Material
2.1. Cement
2.2. Supplementary Cementitious Materials
2.3. Aggregates
2.4. Water Reducer
3. Mix Proportions and Specimen Preparation
3.1. Mix Proportions
3.2. Specimen Preparation
4. Experimental Methodology and Process
5. Results and Discussions
5.1. Compressive Strength and Densities
5.2. Freeze–Thaw Resistance
5.3. Water Penetration Resistance
5.4. Carbonization Resistance
5.5. Chloride Penetration Resistance
5.6. Discussions
- i.
- Attempting to address the current domestic and international applications of lightweight aggregate concrete, where breakthroughs in strength grade have been elusive, with the highest strength grade remaining LC60. Achieving lightweight aggregate concrete with a dry apparent density below 1950 kg/m3 at 28 days and a standardized strength exceeding 50 MPa remains an arduous endeavor.
- ii.
- Employing a novel approach—combining clay and shale ceramic particles as coarse aggregate—unprecedented in the literature (Table 7). This innovation not only reduces concrete’s self-weight but also optimizes aggregate gradation and diminishes voids, ensuring concrete strength.
- iii.
- Distinguishing itself by systematically investigating the durability aspects of lightweight aggregate concrete in marine environments, encompassing freeze–thaw resistance, water infiltration resistance, carbonation, and chloride ion infiltration resistance, which have received limited attention in existing research. These comprehensive durability tests are meticulously conducted in Section 5.2, Section 5.3, Section 5.4 and Section 5.5.
6. Conclusions
- (1)
- Substituting clay ceramsite for shale ceramsite leads to a decrease in compressive strength and oven dry density by 2.3–14.2 Mpa and 50–110 kg/m3, respectively. Conversely, an increase in cement content results in an enhancement of 3.2–12.7 Mpa and 40 kg/m3.
- (2)
- The compressive strength of LWHSC increases first and then decreases with an increase in pre-wetting time. The optional pre-wetting time of approximately 0.5 hours is determined for shale ceramsite by clay ceramsite.
- (3)
- LWHSC exhibits a higher brittleness compared to conventional concrete.
- (4)
- Decreasing the proportions of shale and clay ceramsite light aggregates leads to an increased resistance against freeze–thaw, carbonation, water penetration, and chloride penetration.
- (5)
- The LWHSC prepared herein is suitable for the harsh seawater environment of offshore oil platforms, although its applicability is constrained to regions with minimal freeze–thaw resistance requirements.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Composite | Mass (%) | ||
---|---|---|---|
Cement | Fly Ash | Slag Powder | |
CaO | 65.12 | 2.98 | 39.58 |
SiO2 | 22.41 | 50.17 | 36.85 |
Al2O3 | 4.75 | 37.78 | 9.33 |
Fe2O3 | 3.41 | 4.79 | - |
SO3 | 0.95 | 1.0 | 0.25 |
K2O | - | - | - |
MgO | 2.40 | 1.08 | 7.75 |
Loss on ignition (LOI) | - | 1.52 | 0.41 |
Insoluble | - | 0.95 | - |
Composite | C2S | C3S | C3A | C4AF | Fineness | Specific Gravity |
---|---|---|---|---|---|---|
Mass (%) | 12.10% | 59% | 10.60% | 10.4% | 4100 cm2/g | 3.15 |
Nominal Grain Size/mm | Cumulative Sieve Residue of Each Sieve Number (by Mass)/% | |||||||
---|---|---|---|---|---|---|---|---|
Square Hole Sieve Aperture | ||||||||
37.5 mm | 31.5 mm | 26.5 mm | 19.0 mm | 16.0 mm | 9.50 mm | 4.75 mm | 2.36 mm | |
5~25 | 0 | 3 | 5 | — | 70 | — | 97 | 100 |
Nominal Grain Size/mm | Cumulative Sieve Residue of Each Sieve Number (by Mass)/% | |||||||
---|---|---|---|---|---|---|---|---|
Square Hole Sieve Aperture | ||||||||
37.5 mm | 31.5 mm | 26.5 mm | 19.0 mm | 16.0 mm | 9.50 mm | 4.75 mm | 2.36 mm | |
5~20 | 0 | 3 | — | 9 | — | 76 | 95 | 100 |
Light Aggregates | Gradation (mm) | Bulk Density (kg/m3) | Oven Dry Density (kg/m3) | Water Absorption (%) | Cylinder Compressive Strength (MPa) | Note | |
---|---|---|---|---|---|---|---|
1 h | 24 h | ||||||
Clay ceramsite | 5~25 | 700 | 1230 | 2.7 | 3.8 | 9.8 | Made from clay, sub-clay, and other main raw materials after processing, granulating, and sintering |
Shale ceramsite | 5~20 | 862 | 1340 | 3.0 | 4.3 | 10.9 | Refined from shale as raw material through high temperature and roasting. |
Properties | Appearance | Density | pH Value | Solid Content | Chloride Content |
---|---|---|---|---|---|
Value | liquid | 1.05 kg/Lit | 7.0 | 26% by weight | ≤0.6% |
Mixture | Cement kg/m3 | Fly Ash kg/m3 | Slag Powder kg/m3 | Sand kg/m3 | Shale Ceramsite kg/m3 | Clay Ceramsite kg/m3 | Total Water Consumption kg/m3 | Volume Rate of Sand |
---|---|---|---|---|---|---|---|---|
NC | 350 | 75 | 75 | 632 | 603 * | 0 | 158.1 | |
BM | 350 | 75 | 75 | 632 | 603 | 0 | 158.1 | 0.35 |
SY1 | 350 | 75 | 75 | 632 | 543 | 55 | 158.4 | 0.35 |
SY2 | 371 | 80 | 80 | 614 | 528 | 54 | 166.3 | 0.35 |
SY3 | 371 | 80 | 80 | 702 | 513 | 75 | 166.6 | 0.40 |
SY4 | 371 | 80 | 80 | 702 | 380 | 149 | 165.5 | 0.40 |
SY5 | 451 | 80 | 80 | 702 | 380 | 149 | 162.8 | 0.38 |
Concrete | Oven Dry Density (kg/m3) | Compressive Strength (MPa) | |
---|---|---|---|
7 Day | 28 Day | ||
NC | 2310 | 38.3 | 61.3 |
BM | 2040 | 52.7 | 73.3 |
SY1 | 1930 | 40.7 | 60.1 |
SY2 | 1970 | 43.9 | 72.8 |
SY3 | 2000 | 49.0 | 75.2 |
SY4 | 1950 | 46.7 | 60.6 |
SY5 | 1956 | 46.8 | 67.3 |
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Li, P.; Li, J.; Fan, L.; Mi, S.; Li, J.; Liu, H.; Peng, S.; Huang, W. Experimental Investigation into Lightweight High Strength Concrete with Shale and Clay Ceramsite for Offshore Structures. Sustainability 2024, 16, 1148. https://doi.org/10.3390/su16031148
Li P, Li J, Fan L, Mi S, Li J, Liu H, Peng S, Huang W. Experimental Investigation into Lightweight High Strength Concrete with Shale and Clay Ceramsite for Offshore Structures. Sustainability. 2024; 16(3):1148. https://doi.org/10.3390/su16031148
Chicago/Turabian StyleLi, Pei, Jie Li, Ling Fan, Shendong Mi, Junyi Li, Haoqi Liu, Shuquan Peng, and Wanqi Huang. 2024. "Experimental Investigation into Lightweight High Strength Concrete with Shale and Clay Ceramsite for Offshore Structures" Sustainability 16, no. 3: 1148. https://doi.org/10.3390/su16031148