Physical and Geomechanical Properties of Recycled Aggregate Sourced by Various Grade Concrete Wastes
Öz
This simple and comprehensive study investigates main properties of recycled aggregate (RA) and, in addition to current aggregate standards, this paper proposes a simple prediction approach to estimate density and water absorption of RA in a short time. As well-known, physical tests take a long time (approximately 72 hours), and rapid characterization of the waste is more important especially for recycling plants. Hence, in this paper low, medium, and high strength concrete wastes are considered as RA in the tests to generalize the results. The main properties of RA are accepted as water absorption and density and point load test is employed to determine geomechanical property of RAs. The reasons of the consideration of the point load test are the simplicity of the test and the short test duration. Then, the test results are evaluated and examined. Equations to predict the physical properties of RA using the point load strength index (Is(50)) are proposed and satisfactory results are obtained.
Anahtar Kelimeler
Recycled aggregate Point load test Physical properties Regression analysis
Kaynakça
- 1. Xiao, J., Li, W., Poon, C., 2012. Recent Studies on Mechanical Properties of Recycled Aggregate Concrete in China-A review, Sci. China Technol. Sci. 55, 1463–1480. https://doi.org/10.1007/s11431-012-4786-9.
- 2. Duan, Z.H., Poon, C.S., 2014. Properties of Recycled Aggregate Concrete Made with Recycled Aggregates with Different Amounts of Old Adhered Mortars, Mater. Des. 58, 19-29. https://doi.org/10.1016/j.matdes.2014.01.044.
- 3. Matias, D., de Brito, J., Rosa, A., Pedro, D., 2013. Mechanical Properties of Concrete Produced with Recycled Coarse Aggregates- Influence of the Use of Superplasticizers, Constr. Build. Mater. 44, 101–109. https://doi.org/10.1016/j.conbuildmat.2013.03.011.
- 4. Poon, C.S., Shui, Z.H., Lam, L., Fok, H., Kou, S.C., 2004. Influence of Moisture States of Natural and Recycled Aggregates on the Slump and Compressive Strength of Concrete, Cem. Concr. Res. 34, 31–36. https://doi.org/10.1016/S0008-8846(03)00186-8.
- 5. Sanchez, M., Gutierrez, P.A., 2004. Influence of Recycled Aggregate Quality on Concrete Properties, Proceeding of the International RILEM Conference: The Use of Recycled Materials in Building and Structures, Barcelona, Spain, 545-553.
- 6. Topçu, I.B., Günçan, N.F., 1995. Using Waste Concrete As Aggregate, Cem. Concr. Res. 251385–1390.
- 7. de Brito, J., Saikia, N., 2013. Recycled Aggregate in Concrete Use of Industrial, Construction and Demolition Waste, Springer, XII, 448. https://doi.org/10.1007/978-1-4471-4540-0.
- 8. Mehta, P.K., Monteiro, P.J.M., 2006. Concrete: Microstructure, Properties and Materails, Third Edit, The McGraw-Hill, New York, 684. https://doi.org/10.1036/0071462889.
- 9. Silva, R.V., De Brito, J., Dhir, R.K., 2014. Properties and Composition of Recycled Aggregates from Construction and Demolition Waste Suitable for Concrete Production, Constr. Build. Mater. 65, 201–217. https://doi.org/10.1016/j.conbuildmat.2014.04.117.
- 10. Pedro, v de Brito, J., Evangelista, L., 2014. Influence of the Use of Recycled Concrete Aggregates from Different Sources on Structural Concrete, Constr. Build. Mater. 71, 141–151. https://doi.org/10.1016/j.conbuildmat.2014.08.030.
- 11.ASTM International, 2016. ASTM D5731-16 Standard Test Method for Determination of the Point Load Strength Index of Rock and Application to Rock Strength Classification, West Conshohocken, PA. https://doi.org/10.1520/D5731-16.
- 12. Turkish Standards Institution, 2013. TS EN 12390-7 Tests for Mechanical and Physical Properties of Aggregates-Part 6: Determination of Particle Density and Water Absorption, Ankara, Turkey.
Çeşitli Dayanımlara Sahip Atık Betonlardan Üretilen Geri Kazanılmış Agregaların Fiziksel ve Geomekanik Özellikleri
Öz
Bu basit ve kapsamlı çalışma, geri kazanılmış agreganın (RA) temel özelliklerini araştırmaktadır ve mevcut agrega standartlarına ek olarak, bu makale RA’nın yoğunluğunu ve su absorpsiyonunu kısa sürede tahmin etmek için basit bir tahmin yaklaşımını önermektedir. Bilindiği gibi, fiziksel testler uzun
zaman almaktadır (yaklaşık 72 saat) ve atığın hızlı karakterizasyonu, özellikle geri dönüşüm tesisleri için daha önemlidir. Dolayısıyla, sonuçları genelleştirmek için yapılan testlerde düşük, orta ve yüksek dayanımlı atık betonlardan üretilen RA’lar dikkate alınmıştır. RA’nın temel özellikleri yoğunluk ve su absorpsiyonu olarak kabul edilebilir ve RA'ların geomekanik özelliklerini belirlemek için nokta yük testi kullanılmıştır. Nokta yük testinin dikkate alınmasının nedenleri, testin basitliği ve kısa test süresidir. Elde edilen deney sonuçları dikkate alınarak incelemelerde bulunulmuştur. Ayrıca, RA'nın fiziksel özelliklerini, nokta yük dayanım indeksi (Is(50)) kullanılarak tahmin etmek için denklemler önerilmiş ve tatmin edici sonuçlar elde edilmiştir
Anahtar Kelimeler
Geri kazanılmış agrega Noktasal yükleme deneyi Fiziksel özellikler Regresyon analizi
Kaynakça
- 1. Xiao, J., Li, W., Poon, C., 2012. Recent Studies on Mechanical Properties of Recycled Aggregate Concrete in China-A review, Sci. China Technol. Sci. 55, 1463–1480. https://doi.org/10.1007/s11431-012-4786-9.
- 2. Duan, Z.H., Poon, C.S., 2014. Properties of Recycled Aggregate Concrete Made with Recycled Aggregates with Different Amounts of Old Adhered Mortars, Mater. Des. 58, 19-29. https://doi.org/10.1016/j.matdes.2014.01.044.
- 3. Matias, D., de Brito, J., Rosa, A., Pedro, D., 2013. Mechanical Properties of Concrete Produced with Recycled Coarse Aggregates- Influence of the Use of Superplasticizers, Constr. Build. Mater. 44, 101–109. https://doi.org/10.1016/j.conbuildmat.2013.03.011.
- 4. Poon, C.S., Shui, Z.H., Lam, L., Fok, H., Kou, S.C., 2004. Influence of Moisture States of Natural and Recycled Aggregates on the Slump and Compressive Strength of Concrete, Cem. Concr. Res. 34, 31–36. https://doi.org/10.1016/S0008-8846(03)00186-8.
- 5. Sanchez, M., Gutierrez, P.A., 2004. Influence of Recycled Aggregate Quality on Concrete Properties, Proceeding of the International RILEM Conference: The Use of Recycled Materials in Building and Structures, Barcelona, Spain, 545-553.
- 6. Topçu, I.B., Günçan, N.F., 1995. Using Waste Concrete As Aggregate, Cem. Concr. Res. 251385–1390.
- 7. de Brito, J., Saikia, N., 2013. Recycled Aggregate in Concrete Use of Industrial, Construction and Demolition Waste, Springer, XII, 448. https://doi.org/10.1007/978-1-4471-4540-0.
- 8. Mehta, P.K., Monteiro, P.J.M., 2006. Concrete: Microstructure, Properties and Materails, Third Edit, The McGraw-Hill, New York, 684. https://doi.org/10.1036/0071462889.
- 9. Silva, R.V., De Brito, J., Dhir, R.K., 2014. Properties and Composition of Recycled Aggregates from Construction and Demolition Waste Suitable for Concrete Production, Constr. Build. Mater. 65, 201–217. https://doi.org/10.1016/j.conbuildmat.2014.04.117.
- 10. Pedro, v de Brito, J., Evangelista, L., 2014. Influence of the Use of Recycled Concrete Aggregates from Different Sources on Structural Concrete, Constr. Build. Mater. 71, 141–151. https://doi.org/10.1016/j.conbuildmat.2014.08.030.
- 11.ASTM International, 2016. ASTM D5731-16 Standard Test Method for Determination of the Point Load Strength Index of Rock and Application to Rock Strength Classification, West Conshohocken, PA. https://doi.org/10.1520/D5731-16.
- 12. Turkish Standards Institution, 2013. TS EN 12390-7 Tests for Mechanical and Physical Properties of Aggregates-Part 6: Determination of Particle Density and Water Absorption, Ankara, Turkey.
Ayrıntılar
| Birincil Dil | Türkçe |
|---|---|
| Konular | Mühendislik |
| Bölüm | Makaleler |
| Yazarlar | |
| Yayımlanma Tarihi | 10 Mayıs 2021 |
| Yayımlandığı Sayı | Yıl 2021 Cilt: 36 Sayı: 1 |
