Research on the Water Absorption and Release Characteristics of a Carbonized γ-C2S Lightweight Aggregate in Lightweight and High-Strength Concrete
Abstract
:1. Introduction
2. Raw Materials and Experimental Methods
2.1. Raw Materials
2.2. Design of Mix Proportions
2.3. Experimental Method
2.3.1. Test of the Water Absorption Rate of Lightweight Aggregates within a Specific Time Range
2.3.2. Development of the Water Absorption Curve of Lightweight Aggregates
2.3.3. Test of the Water Release Rate of Lightweight Aggregates Over a Specific Time Period
2.3.4. Development of the Water Release Curve of Lightweight Aggregates
2.3.5. Test of the Internal Humidity in Cementitious Slurry
2.3.6. Test of the Free Water Content of Cement Paste Surrounding Aggregates
3. Results and Discussion
3.1. The Water Absorption Characteristics of Different Types of Lightweight Aggregates
3.1.1. The Water Absorption Curves of Different Types of Lightweight Aggregates
3.1.2. Establishment of Water Absorption Models for Various Types of Lightweight Aggregates
3.2. The Moisture Release Characteristics of High-Performance Lightweight Aggregates in Air
3.2.1. The Moisture Release Curves of Various Types of Prewetted Lightweight Aggregates
3.2.2. The Moisture Release Behavior of High-Performance Lightweight Aggregates under Varying Temperature and Humidity Conditions
The Moisture Release Curves of High-Performance Lightweight Aggregates at Different Temperatures
The Moisture Release Curves of High-Performance Lightweight Aggregates at Varying Humidities
The Moisture Release Process of High-Performance Lightweight Aggregates under Varying Temperature and Humidity Conditions
3.3. The Moisture Release Characteristics of High-Performance Lightweight Aggregates in Low Water–Binder Ratio Mortar
3.3.1. Cement Paste Internal Humidity
3.3.2. The Gradient Distribution of Free Water in the Transition Zone between Cement Paste and Lightweight Aggregates
3.3.3. The Water Release Model of Prewetted Lightweight Aggregates in Cementitious Materials
4. Conclusions
- (1)
- The water absorption rates of self-made high-performance lightweight aggregates (CCs), magnesia lightweight aggregates (MCs), and shale lightweight aggregates (SCs) initially increase and then stabilize with increasing water absorption time, following the typical Boxlucas equation pattern.
- (2)
- Under ambient conditions, the water release time of prewetted lightweight aggregates is in the order of CC > MC > SC.
- (3)
- The water storage performance of prewetted SCs is relatively poor; non-pre-wetted or 50% prewetted CCs absorb a certain amount of water during the mixing process, resulting in a reduction in the local water–cement ratio of the slurry; and 100% prewetted CCs have good water storage performance during the mixing phase.
- (4)
- Adding 100% prewetted lightweight aggregates can significantly increase the free water content in the interface transition zone, which helps improve the degree of hydration in the transition zone and the compensatory shrinkage efficiency of the expansion agent, thereby improving the mechanical strength and volume stability of cement-based materials.
- (5)
- In low water–cement ratio cement-based materials, the water release process of prewetted lightweight aggregates can be simply divided into three stages: Stage I—initial hydration stage; Stage II—increase in hydration degree; and Stage III—late hydration stage.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Raw Materials | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | SO3 | K2O | Na2O | Loss |
---|---|---|---|---|---|---|---|---|---|
cement | 20.87 | 4.87 | 3.59 | 64.47 | 2.13 | 2.52 | 0.65 | 0.11 | 0.77 |
silica fume | 96.34 | 0.61 | 0.16 | 0.54 | 0.25 | 0.13 | 0.21 | 0.08 | 1.68 |
fly ash microspheres | 58.50 | 32.40 | 3.01 | 1.60 | 0.53 | 0.33 | 1.72 | 0.42 | 1.22 |
Lightweight Aggregate | Degree of Compaction | Bulk Density (kg·m−3) | Cylinder Compressive Strength (MPa) | |||
---|---|---|---|---|---|---|
Wa (%) | Pa (%) | Db (kg·m3) | Drel (%) | |||
CC | 17.12 | 35.90 | 1331 | 54.87 | 716 | 6.74 |
MC | 12.41 | 24.27 | 1548 | 61.56 | 948 | 7.24 |
SC | 8.16 | 15.76 | 1483 | 53.42 | 793 | 6.15 |
Degree of Prewetting | Cement (g) | Silica Fume (g) | Fly Ash (g) | Water- Cement Ratio | Internal Curing Water (g) | Lightweight Aggregate (g) | Water Reducer (%) |
---|---|---|---|---|---|---|---|
non-pre-wetting | 334 | 98 | 77 | 0.18 | 0 | 266 | 2.0 |
50% prewetting | 334 | 98 | 77 | 0.18 | 22.7 | 266 | 2.0 |
100% prewetting | 334 | 98 | 77 | 0.18 | 45.4 | 266 | 2.0 |
T | RH | α | β | R2 |
---|---|---|---|---|
20 °C | 50% | 0.9568 | 5.5121 | 0.9899 |
60% | 0.8920 | 7.8542 | 0.9956 | |
70% | 0.8148 | 13.6511 | 0.9989 | |
40 °C | 50% | 0.8940 | 4.0359 | 0.9872 |
60% | 0.8578 | 4.2263 | 0.9901 | |
70% | 0.8393 | 5.3776 | 0.9931 | |
60 °C | 50% | 1.0001 | 0.3662 | 0.9885 |
60% | 1.0004 | 0.4342 | 0.9905 | |
70% | 1.0005 | 0.5880 | 0.9960 |
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Share and Cite
Yu, Z.; Liu, C.; Li, J.; Wu, J.; Ma, X.; Cao, Y.; Cao, J.; Xiang, W.; Wang, H.; Ding, Q. Research on the Water Absorption and Release Characteristics of a Carbonized γ-C2S Lightweight Aggregate in Lightweight and High-Strength Concrete. Coatings 2024, 14, 1056. https://doi.org/10.3390/coatings14081056
Yu Z, Liu C, Li J, Wu J, Ma X, Cao Y, Cao J, Xiang W, Wang H, Ding Q. Research on the Water Absorption and Release Characteristics of a Carbonized γ-C2S Lightweight Aggregate in Lightweight and High-Strength Concrete. Coatings. 2024; 14(8):1056. https://doi.org/10.3390/coatings14081056
Chicago/Turabian StyleYu, Zi, Chenxi Liu, Jinhui Li, Jing Wu, Xueting Ma, Yugui Cao, Jierong Cao, Weiheng Xiang, Hua Wang, and Qingjun Ding. 2024. "Research on the Water Absorption and Release Characteristics of a Carbonized γ-C2S Lightweight Aggregate in Lightweight and High-Strength Concrete" Coatings 14, no. 8: 1056. https://doi.org/10.3390/coatings14081056