Influence of Mechanical Screened Recycled Coarse Aggregates on Properties of Self-Compacting Concrete
2. Materials and Methods
2.1. Materials and Sample Preparation
2.2. 3D Model
2.3. Physical Characteristic Testing of Aggregates
2.4. Fresh and Hardened Properties of RA-SCC
3.1. Characteristics of RA
3.1.1. Particle Size Distribution
3.1.2. Aggregate Crushing Value
3.1.3. Water Absorption
3.1.4. The Surface Structure of RAs
3.2. Properties of RA-SCC
3.2.3. Compressive Strength
3.2.4. Tensile Test
3.2.5. Elastic Modulus
3.2.6. Microstructure Observation
- The size distribution results revealed that unscreened RA contains a large number of fine aggregates with high porosity and consequently a higher water absorption.
- Screening improved the crushing values of RA, and all of the screened RA lie well within standard limits (20–30%) following AS 1141.21.
- The water absorption of RA decreased as the number of screening increased due to the removal of a greater amount of adhered mortar from the surface of RA. The water absorption of RA reduced from 6.12% to 5.34% after screening two times.
- SCC mixes with screened RA had higher maximum flow diameters (Dmax) than those containing unscreened RA. The slump flow times of all SCC mixes fell within the standard range of 2–7 s.
- Screening increased the 28-day compressive strength of SCC mixes by 15–28% on average, compared to the mixes with unscreened RA. The results of tensile strength and elastic modulus show similar patterns. However, increasing the screening more than twice might increase micro-cracks along the old ITZs, affecting the mechanical properties.
- The microstructure of concrete samples containing screened RAs was generally comparable to that of the control concrete, with minimal pores, voids and cracks along the interfacial transition zones.
- Based on mechanical performance, 50RA mixes with RA screened either once or twice performed the best among the RA mixes. Therefore, once or twice screening is recommended to the recycling facility plant to remove the adequate amount of adhered mortar and reduce fines from the RA.
- The mechanical screening is a practical approach to improve the quality of RA and the final concrete, owing to its contribution to removing adhered mortar on the surface of RA. However, the environmental impacts of screening need to be examined further, as each incurs expenses, takes time, and consumes energy. Nevertheless, the residual fines after screening are appropriate for use as a road base compaction material or a sub-base under concrete, which could offset their environmental consequences.
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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|RA Type||Times of|
|Mixing Code||NA (kg)||RA (kg)||Sand (kg)||Cement (kg)||Fly Ash (kg)||Water (L)||S.P (mL)|
|Mixing Code||T500 (s)||Average Diameter (mm)|
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Tang, W.; Khavarian, M.; Yousefi, A.; Landenberger, B.; Cui, H. Influence of Mechanical Screened Recycled Coarse Aggregates on Properties of Self-Compacting Concrete. Materials 2023, 16, 1483. https://doi.org/10.3390/ma16041483
Tang W, Khavarian M, Yousefi A, Landenberger B, Cui H. Influence of Mechanical Screened Recycled Coarse Aggregates on Properties of Self-Compacting Concrete. Materials. 2023; 16(4):1483. https://doi.org/10.3390/ma16041483Chicago/Turabian Style
Tang, Waiching, Mehrnoush Khavarian, Ali Yousefi, Bill Landenberger, and Hongzhi Cui. 2023. "Influence of Mechanical Screened Recycled Coarse Aggregates on Properties of Self-Compacting Concrete" Materials 16, no. 4: 1483. https://doi.org/10.3390/ma16041483