Impact of glass powder and silica fume as partial cement replacements using a new mixing method
Oral Presentation
Paper ID : 1176-ICASGE (R1)
Authors
1October High Institute for Engineering & Technology, Egypt
2Faculty of Engineering, Benha University, Egypt
3Faculty of Engineering at Shoubra, Benha University, Egypt
Abstract
This study investigates the use of local waste glass powder (GP) and silica fume (SF) as partial cement replacements in concrete. An experimental program was conducted in two stages: first, GP replaced cement at 0%, 10%, 15%, 20%, and 25% by weight, evaluating its impact on fresh and hardened properties; second, SF replaced cement at 5%, 7.5%, and 10% while using the optimal GP percentage. Two mixing methods were tested: traditional mixing and a method where GP was dissolved in water before mixing. Results showed that increasing GP improved workability but reduced early compressive strength, which improved by time. SF enhanced strength across all mixes. GP replacement up to 20% increased tensile strength, while flexural strength improved with higher GP content, reaching an 18.6% increase at 28 days. At 56 days, concrete with 20% GP achieved compressive strength comparable to control concrete. Incorporating SF further enhanced performance, and the new mixing method yielded better results than traditional mixing.
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