Experimental Research on Properties of UHPC Based on Composite Cementitious Materials System
Abstract
:1. Introduction
2. Experimental Program
2.1. Materials
2.2. Preparation of Geopolymer Recycled-Aggregate Pervious Concrete
2.2.1. Mixture Proportions
2.2.2. Specimen Preparation
2.2.3. Testing Methods
- (1)
- Working performance and mechanical properties
- (2)
- Shrinkage and hydration temperature
- (3)
- Mineralogical compositions and microstructure
3. Results
3.1. Working Performance
3.2. Mechanical Performance
3.3. Mineralogical Compositions and Microstructure
3.4. Shrinkage and Hydration Temperature
4. Conclusions
- (1)
- In UHPC based on composite cementitious materials system, SAC can contribute to improving the working performance, PC and SAC can promote their hydration process mutually, so as to greatly shorten the setting time. In the PC-SAC composite cementing material system, the effect of shortening the setting time with the ratio of SAC of 0.1 is far better with the ratio of SAC of 0.2;
- (2)
- When the ratio of SAC is between 0.1 and 0.2 in PC-SAC composite cement material system, its flexural strength has a certain degree of decrease with excellent mechanical properties still remaining. UHPC based on composite cementitious materials system has potential to apply in repair of highway and bridge. Depending on the actual requirements of the different application, the ratio of SAC can be varied in the PC-SAC composite cement material system;
- (3)
- The micro analysis of UHPC based on composite cementitious materials system can further prove that SAC plays a role in promoting the hydration of the system. The relatively dense microstructure assures the mechanical properties of UHPC based on composite cementitious materials system. However, more SAC is not better for the properties of UHPC based on composite cementitious materials system. The experimental results showed that UHPC based on composite cementitious materials system would have better properties when the ratio of SAC is 0.1~0.2;
- (4)
- UHPC will provide excellent mechanical performance indoors. However, the flexural strength of UHPC is not decreased outdoors. The rate of hydration is faster in UHPC outdoor so that more C-S-H gel produced will wrap in some extent. The decomposition of is promoted so that more C-A-H gel and other products are produced due to the unstable temperature outdoors. Moreover, C-A-H gel will also wrap in some extent. So, there was more C-S-H gel, C-A-H gel, in UHPC outdoor. The hydration of UHPC was not complete outdoors. The outdoor performance of UHPC will be optimized by the proper ratio of SAC in PC-SAC composite cement system;
- (5)
- The macroscopic properties and micro analysis of UHPC based on composite cementitious materials system could verify the influence of SAC on PC-SAC composite cement system and the influence of curing conditions on UHPC. It can also be the basic method on the analysis of the composite cementitious materials system. In the research, there are no comprehensive investigations of the UHPC based on composite cementitious materials system in the numerical simulation method. In the future, the research of UHPC based on composite cementitious materials system can be investigated in the numerical simulation method so that the research can be improved and universal in the research of UHPC for repair of highway and bridge.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Material | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | SO3 | Loss |
---|---|---|---|---|---|---|---|
PC 1 | 27.94 | 6.85 | 2.53 | 53.65 | 6.85 | / | 3.02 |
SAC 2 | 7.64 | 26.63 | 4.28 | 45.88 | 0.84 | 4.97 | 4.08 |
SF 3 | 98.74 | 0.64 | 0.05 | 0.13 | 0.43 | / | 6.02 |
FA 4 | 62.66 | 21.73 | 4.45 | 4.98 | 1.47 | / | 1.11 |
Specimen | W/B Ratio | PC | SAC | SF | FA | F | QS | SP |
---|---|---|---|---|---|---|---|---|
A1 | 0.18 | 1.00 | / | 0.23 | 0.24 | 0.16 | 1.32 | 0.05 |
A2 | 0.95 | 0.05 | ||||||
A3 | 0.90 | 0.10 | ||||||
A4 | 0.80 | 0.20 | ||||||
A5 | 0.70 | 0.30 | ||||||
A6 | / | 1.00 |
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Kong, F.; Xu, F.; Xiong, Q.; Xu, S.; Li, X.; Fu, W.; Guo, Z. Experimental Research on Properties of UHPC Based on Composite Cementitious Materials System. Coatings 2022, 12, 1219. https://doi.org/10.3390/coatings12081219
Kong F, Xu F, Xiong Q, Xu S, Li X, Fu W, Guo Z. Experimental Research on Properties of UHPC Based on Composite Cementitious Materials System. Coatings. 2022; 12(8):1219. https://doi.org/10.3390/coatings12081219
Chicago/Turabian StyleKong, Fansheng, Fang Xu, Qiuyang Xiong, Songji Xu, Xiang Li, Wenxiang Fu, and Zhijiong Guo. 2022. "Experimental Research on Properties of UHPC Based on Composite Cementitious Materials System" Coatings 12, no. 8: 1219. https://doi.org/10.3390/coatings12081219