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Using Reclaimed Cement Concrete in Pavement Base Mixes with Foamed Bitumen Produced in Cold Recycling Technology
Justyna Stępień1, Krzysztof Maciejewski1
1Department of Transportation Engineering, Faculty of Civil Engineering and Architecture, Kielce University of Technology, Aleja Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland.
Materials (Basel, Switzerland)
|July 28, 2022
Summary
Reclaimed cement concrete in cold-recycled mixes showed slightly higher compressive strength, but the effect was not statistically significant. This suggests secondary cementation is limited in road base applications.
Area of Science:
- Civil Engineering
- Materials Science
- Sustainable Construction
Background:
- Reclaimed cement concrete (RCC) offers a sustainable alternative to natural aggregates in road construction.
- Potential secondary cementation from non-hydrated cement in RCC could impact long-term pavement performance.
- Cold recycling with foamed bitumen is an environmentally friendly pavement rehabilitation technique.
Purpose of the Study:
- To investigate the use of RCC in cold-recycled mixes with foamed bitumen.
- To evaluate the time evolution of compressive strength in these mixes.
- To determine if secondary cementation occurs and affects material properties.
Main Methods:
- Preparation of two mixtures: a reference mix and a mix with 25% RCC.
- Testing uniaxial compressive strength at various curing periods (3, 4, 7, 14, and 28 days).
- Comparative analysis of strength development between the reference and RCC-containing mixtures.
Main Results:
- Mixtures with RCC exhibited marginally higher average uniaxial compressive strengths (11.5 kPa increase).
- Specific strength at 28 days: 498 kPa (reference) vs. 506 kPa (RCC).
- Statistical analysis revealed no significant differences in compressive strength between the mixtures.
Conclusions:
- The incorporation of RCC into cold-recycled mixes with foamed bitumen did not lead to statistically significant increases in compressive strength.
- The limited effect is likely due to the time lag between demolition and reuse, and the presence of bitumen as a binder.
- Secondary cementation from RCC in this application appears minimal under typical conditions.
Keywords:
cold recyclingfoamed bitumenreclaimed aggregatereclaimed asphalt pavementreclaimed cement concreteroad base mixessecondary settingMore Related Videos
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