Physical and Mechanical Properties of High-Strength Concrete Modified with Supplementary Cementitious Materials after Exposure to Elevated Temperature up to 1000 °C
Abstract
:1. Introduction
2. Experimental Details
2.1. Materials
2.1.1. Cement and SCMs Used
2.1.2. Aggregate
2.1.3. Admixture
2.2. Mixture and Preparation
2.3. Test Methods
3. Results and Discussion
3.1. Workability
3.2. Mechanical Properties at the AT
3.2.1. Compressive Strength
3.2.2. Flexural Strength
3.3. Mechanical Properties Subjected to Elevated Temperatures
3.4. Physical Properties Subjected to Elevated Temperatures
3.4.1. Physical Appearance
3.4.2. Loss Mass
3.4.3. Water Absorption
3.4.4. Porosity
3.5. Relation Between Residual Compressive Strength and Physical Properties
3.5.1. Relation Between Residual Compressive Strength and Loss Mass
3.5.2. Relation Between Residual Compressive Strength and Water Absorption
3.5.3. Relation Between Residual Compressive Strength and Porosity
4. Conclusions
- (1)
- The slump value of fresh concrete increased with addition of SCMs, compared with the control mix. The addition of FA showed more effective than that of the UFFA or combined usage of SCMs in increasing the workability of HSC.
- (2)
- The influence of SCMs on early-age (3 d) compressive strength of HSC was limited, while it had a significant influence on the long-term strength of HSC. The combined usage of SCMs can provide excellent synergetic effects on mechanical properties of HSC.
- (3)
- Two distinct stages of evolution of residual strength of the specimen subjected to elevated temperatures: a slight increase of residual compressive strength at 400 °C, and a sharp drop beyond 400 °C. The combining usage of SCMs had a positive effect on the residual compressive strength of HSC, for specimens containing UFFA-MK and FA-UFFA-MK at 1000 °C, the residual strength retained 18.5 MPa and 23.3 MPa, respectively.
- (4)
- The loss mass of concrete at 400 °C increased approximately by 10 times that of at the AT. The specimen containing FA-UFFA-MK showed the best physical properties when the temperature rose above 600 °C. A strongly correlated relation between residual strength and physical properties of HSC exposed to elevated temperatures.
Author Contributions
Funding
Conflicts of Interest
References
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Physical Properties | Setting Time /min | Flexural Strength /MPa | Compressive Strength /MPa | ||||
---|---|---|---|---|---|---|---|
Density /(g·cm−3) | Specific Surface /(cm2·g−1) | Initial | Final | 3 d | 28 d | 3 d | 28 d |
3.05 | 4610 | 113.0 | 146.0 | 5.7 | 9.2 | 28.7 | 60.1 |
Label | CaO | SiO2 | Al2O3 | Fe2O3 | SO3 |
---|---|---|---|---|---|
Cement | 59.7 | 21.5 | 5.8 | 4.0 | 2.0 |
FA | 4.1 | 50.8 | 25.0 | 2.6 | 0.3 |
UFFA | 4.4 | 59.5 | 28.6 | 2.6 | 0.3 |
MK | 0.4 | 46.9 | 44.3 | 4.4 | 0.2 |
Cement | Water | Fine Aggregate | Coarse Aggregate | SP |
---|---|---|---|---|
600 | 126 | 634 | 1126 | 6 |
Concrete ID | Mass of Cement Substituted by Cementitious Materials SCMs/% | ||
---|---|---|---|
FA | UFFA | MK | |
Control mix | 0 | 0 | 0 |
S1-HSC | 30 | 0 | 0 |
S2-HSC | 0 | 30 | 0 |
S2-S3-HSC | 0 | 30 | 5 |
S1-S2-S3-HSC | 10 | 20 | 5 |
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Zhou, J.; Lu, D.; Yang, Y.; Gong, Y.; Ma, X.; Yu, B.; Yan, B. Physical and Mechanical Properties of High-Strength Concrete Modified with Supplementary Cementitious Materials after Exposure to Elevated Temperature up to 1000 °C. Materials 2020, 13, 532. https://doi.org/10.3390/ma13030532
Zhou J, Lu D, Yang Y, Gong Y, Ma X, Yu B, Yan B. Physical and Mechanical Properties of High-Strength Concrete Modified with Supplementary Cementitious Materials after Exposure to Elevated Temperature up to 1000 °C. Materials. 2020; 13(3):532. https://doi.org/10.3390/ma13030532
Chicago/Turabian StyleZhou, Jianwei, Dong Lu, Yuxuan Yang, Yue Gong, Xudong Ma, Baoying Yu, and Baobao Yan. 2020. "Physical and Mechanical Properties of High-Strength Concrete Modified with Supplementary Cementitious Materials after Exposure to Elevated Temperature up to 1000 °C" Materials 13, no. 3: 532. https://doi.org/10.3390/ma13030532