Feasibility of Non-Remanufactured Waste Bottle Glass as Supplementary Cementitious Material

• Type: Article in International Scientific Journal
• Date: 2024-02-28

Authors

Ana Mafalda Matos (Author) FEUP; Joana Sousa Coutinho (Author) FEUP

Journal

Title: Applied Sciences

Vol. 14 No. 5

Publisher: MDPI

Indexing

ISI Web of Science

Scopus

Scientific classification

CORDIS: Technological sciences > Engineering > Civil engineering > Concrete engineering

FOS: Engineering and technology > Civil engineering

Other information

DOI: 10.3390/app14052004

Abstract (EN): Theoretically, glass can be recycled entirely, but there are several requirements for remanufacturing. For the first time, this work studied industrial bottle waste glass (WG), which cannot be used to remanufacture new glass as a cement replacement for concrete applications. Wet and dry milling treatments were performed to reduce the particle size of WG and remove fibre and plastic contaminants. The different waste glasses treated were characterised by chemical, physical, and morphological analysis. Afterwards, mortar-level studies followed, using raw WG and wet-milled WG (AGWG) as a 10% Portland cement replacement. Mechanical and several durability indicators were assessed. WG and AGWG incorporation improved mortar performance against water capillary absorption, chloride ingress, and alkali–silica reaction. The unfavourable effect, namely, mechanical strength loss on glass-modified mortars, was mainly due to fibre contaminants observed by SEM on WG and AGWG samples. Even though wet milling reduced the amount and length of the fibre contaminants, it still did not guarantee adequate mechanical strength for the mortar. Thus, additional or alternative treatments, such as thermal treatments, must be explored.

Language: English

Type (Professor's evaluation): Scientific