Mechanical Performance of One-part Alkali-activated Precast Concrete Incorporating Calcined Clay and Industrial By-products
7th fib Congress on Structural Concrete 2050: Towards Carbon Neutrality, AI Design, and Robotic Construction, 2026, Lisbon, Portekiz, 15 - 19 Haziran 2026, ss.3052-3059, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Basıldığı Şehir: Lisbon
- Basıldığı Ülke: Portekiz
- Sayfa Sayıları: ss.3052-3059
- Anahtar Kelimeler: calcined clay, mechanical properties, One-part alkali-activation, precast concrete, washing aggregate sludge
- Yıldız Teknik Üniversitesi Adresli: Evet
Özet
The diminishing production and availability of common precursors such as fly ash (FA) and blast furnace slag (BFS) for alkali-activated concrete (AAC) mixes necessitates the exploration of alternative binder sources. Calcined clays (CCs) emerge as a noteworthy option owing to their extensive availability. However, the application of CCs as a sole binder in AAC mixes has not garnered significant attention owing to challenges related to their low strength development and reduced workability. Hence, this study has focused on the production of one-part calcined clay-based precast AAC mixes incorporating industrial by-products or waste materials as a secondary binder source. Washing aggregate sludge (WAS), FA, or BFS was utilized up to 25% in AAC formulations, while 75% CC served as the primary binder. The precast AAC samples were activated with sodium metasilicate and were cured at 80 °C for 24 h. The compressive strength, modulus of elasticity, splitting tensile strength, and water sorptivity of AACs were investigated. The Key results revealed that calcined clay-based AACs supported with industrial wastes achieved a compressive strength up to 40 MPa and elastic modulus between 10 GPa and 20 GPa at 28 days. The findings of this research point out the viability of manufacturing CC-based AAC mixes containing industrial by-products and wastes with satisfactory properties and their possible utilization in the construction industry.