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Testing and Analysis of Ultra-High Toughness Cementitious Composite-Confined Recycled Aggregate Concrete under Axial
Li He1, Sheng Peng2,3, Yong-Sheng Jia2,3
1Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Wuhan 430065, China.
Materials (Basel, Switzerland)
|October 14, 2023
Summary
Ultra-high-toughness cementitious composite (UHTCC) effectively confines recycled aggregate concrete (RAC), significantly enhancing its axial compressive properties and load-bearing capacity. Steel fibers further boost performance, making UHTCC-confined RAC a viable construction material.
Area of Science:
- Civil Engineering
- Materials Science
- Structural Engineering
Background:
- Recycled aggregate concrete (RAC) presents an opportunity for sustainable construction but often exhibits reduced mechanical properties compared to traditional concrete.
- Ultra-high-toughness cementitious composite (UHTCC) offers superior ductility and strength, suggesting potential for reinforcing weaker concrete materials.
Purpose of the Study:
- To investigate the effectiveness of UHTCC as a confining material for recycled aggregate concrete (RAC).
- To analyze the impact of UHTCC confinement thickness and fiber reinforcement on the axial compressive properties of RAC specimens.
- To evaluate UHTCC-confined RAC for its suitability in engineering applications.
Main Methods:
- Design and manufacturing of UHTCC-confined RAC components adhering to GB/T50081-2002 standards.
- Experimental analysis including surface failure observation, load-displacement curve recording, and scanning electron microscopy (SEM).
- Parametric analysis to quantify the effects of UHTCC confinement thickness and fiber type (steel fiber, polyvinyl alcohol fiber) on mechanical performance.
Main Results:
- UHTCC confinement significantly improves the mechanical properties and controls surface failure of RAC structures.
- Increasing UHTCC confinement thickness from 10 mm to 20 mm resulted in peak load increases of 44.61% and 79.27%, respectively.
- The performance enhancement order for fibers in UHTCC was steel fiber (SF) > polyvinyl alcohol fiber (PVAF) > polyvinyl alcohol fiber (PEF) > no fiber.
Conclusions:
- UHTCC confinement is an effective method for enhancing the axial compressive properties of RAC.
- Steel fibers provide the most significant improvement in the axial compression performance of UHTCC-confined RAC.
- UHTCC-confined RAC demonstrates potential for use in structural applications requiring improved mechanical properties, with fiber selection tailored to specific performance needs.
Keywords:
confinementengineering practicerecycled aggregate concrete (RAC)scanning electron microscope (SEM)ultra-high toughness cementitious composite (UHTCC)More Related Videos
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