Analysis of the Effect of Layer Height on the Interlayer Bond in Self-Compacting Concrete Mix in Slab Elements
Abstract
:1. Introduction
2. Materials and Methods
2.1. Concrete Mixture
2.2. Specimens and Basic Modules
2.3. Test Procedures
3. Results and Discussion
3.1. Fresh Mix Properties and Concrete Strength
3.2. Interlayer Bond Strength
4. Conclusions
- In the context of the multilayer casting of slab elements, the delay in placing the top layer has a significant impact on the interlayer bond strength. It has been demonstrated that the interlayer bond strength is influenced by both the height of the top layer and its free-flow distance from the mix casting point.
- The study revealed that the lower the top layer, the more pronounced the impact of distance from the casting location on the decrease in interlayer bond strength. The maximum decrease in interlayer bond strength along the element compared to the monolithic specimen was observed for layers of 50, 75, and 100 mm, at 38.2%, 27.3%, and 13.0%, respectively.
- The study revealed significant differences in the mixing pattern of the concrete layers depending on the height of the top layer. The greater the height of the top layer, the more irregular the course of the layer contact and the more intense the mixing of the layers within the element cross-section. The mixing of the layers thus produced precludes the possibility of a continuous structural weakening of the structure.
- In the case of multilayer SCC placement, it is recommended that the free flow of the mix over the previously placed layer be restricted when concreting is interrupted for longer periods. This is particularly pertinent to areas where the flow speed is reduced, such as corners, narrowing in the formwork, and so forth. An alternative approach is to adjust the height of subsequent layers to align with the free-flow distance. In accordance with the test conditions presented in this study, the top layer should be at least 125 mm in height.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Row Designation (See Figure 1) | Monolithic Sample | Height of the Top Layer | ||||||
---|---|---|---|---|---|---|---|---|
50 mm | 75 mm | 100 mm | ||||||
fct,sp [MPa] | SD [MPa] | fct,sp [MPa] | SD [MPa] | fct,sp [MPa] | SD [MPa] | fct,sp [MPa] | SD [MPa] | |
1 | 3.85 | 0.40 | 3.77 | 0.24 | 3.82 | 0.17 | 3.96 | 0.18 |
2 | 3.44 | 0.24 | 3.62 | 0.20 | 3.73 | 0.14 | ||
3 | 3.04 | 0.19 | 3.11 | 0.21 | 3.54 | 0.23 | ||
4 | 2.78 | 0.29 | 3.01 | 0.23 | 3.35 | 0.16 | ||
5 | 2.38 | 0.30 | 2.80 | 0.28 | 3.35 | 0.17 |
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Dybeł, P.; Kucharska, M. Analysis of the Effect of Layer Height on the Interlayer Bond in Self-Compacting Concrete Mix in Slab Elements. Materials 2024, 17, 4005. https://doi.org/10.3390/ma17164005
Dybeł P, Kucharska M. Analysis of the Effect of Layer Height on the Interlayer Bond in Self-Compacting Concrete Mix in Slab Elements. Materials. 2024; 17(16):4005. https://doi.org/10.3390/ma17164005
Chicago/Turabian StyleDybeł, Piotr, and Milena Kucharska. 2024. "Analysis of the Effect of Layer Height on the Interlayer Bond in Self-Compacting Concrete Mix in Slab Elements" Materials 17, no. 16: 4005. https://doi.org/10.3390/ma17164005