Effect of recycled concrete aggregate gradation and aggregate/binder ratio on hardened properties of CDW-based geopolymer mortars
3RD INTERNATIONAL CIVIL ENGINEERING and ARCHITECTURE CONFERENCE,, Trabzon, Türkiye, 13 - 15 Ekim 2023, cilt.1, sa.1, ss.630-641, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Cilt numarası: 1
- Basıldığı Şehir: Trabzon
- Basıldığı Ülke: Türkiye
- Sayfa Sayıları: ss.630-641
- Ankara Yıldırım Beyazıt Üniversitesi Adresli: Hayır
Özet
Purpose: The linear economic model of the construction industry, which follows a make-use-dispose approach, continuously leads to sustainability problems due to continuous raw material consumption. Additionally, the Portland cement results in high carbon emissions and excessive energy consumption. Therefore, the aim of this study is to develop construction and demolition waste (CDW)-based geopolymer mortar to be utilized as a novel binder material in the construction industry. This approach aims to mitigate waste disposal issues and provide an alternative to Portland cement. Study design/methodology/approach: The study developed 100% CDW-based geopolymer mortars using varying aggregate/binder ratios and gradations, activated by alkali sodium hydroxide and calcium hydroxide. By incorporating recycled concrete aggregate with different gradations and ratios, the research aimed to assess the impact of these factors on the properties of the geopolymer mortars. Findings: The study revealed that the optimal 28-day compressive and flexural strengths were attained at an aggregate/binder ratio of 2.0 for all aggregate gradations. Beyond this ratio, for most of the mixtures, mechanical strengthstent to decrease. Notably, the highest compressive (16.1 MPa) and flexural (5.25 MPa) strengths were observed with a 2.0 aggregate/binder ratio and 0-4.75 mm aggregate sizes. Originality/value: This study will create a significant advancement in transitioning to a circular economy model by utilizing CDW through upcycling practices. In contrast to mainstream waste materials, the immense quantities of CDW generated annually can be integrated into the value chain in the sector through geopolymerization, offering substantial advantages for achieving sustainable development goals.