السنة | 2024 |
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التخصص | ماجستير هندسة الإنشاءات |
العنوان | Production of high-performance concrete using waste glass and waste concrete as aggregate |
اسم المشرف الرئيسي | - - | Mohammed Salman AL-lami |
اسم المشرف المشارك | | |
اسم الطالب | - - | Abdulaziz Ishaq Amer Hdaib |
Abstract | High-Performance Concrete (HPC) is an engineering concrete that possesses the most desirable properties during the fresh and hardened concrete stages. High Performance Concrete (HPC) is far superior to conventional cement concrete with HPC components contributing to the best, most efficient, and most effective properties This research focuses on developing HPC using waste glass and recycled concrete as alternative aggregate materials while maintaining mechanical properties and sustainability. For this purpose, an experimental program was conducted to analyze the effect of using different glass powder ratios, silica fume, superplasticizers, water-binder ratio, and percentage of recycled aggregate on the compressive strength and modulus of rupture of HPC specimens tested at 7 and 28 days. The importance of this experimental program falls within a methodical assessment of these materials and their effect on compressive strength, modulus of rupture, and general workability. It was divided into five phases, each handling one discrete variable, understood to influence performance in concrete. In Phase 1, the influence of glass powder content was studied. The glass powder content in the mixtures was varied from 0% to 28.2% as a partial replacement for Ordinary Portland Cement. In phase 2 mixtures the variable was the superplasticizer dosages. The water-binder ratio was the variable in the mixtures of Phase 3. It was adjusted to vary between 18% and 24%. Phase 4 explored the effect of adding silica fume to the mixture. Silica fume in proportions ranging from 12.1% to 35% was studied. Finally, in Phase 5, the crushed waste concrete aggregate was used as an alternative to natural aggregate. The recycled aggregate content ranged from 25% to 75% in the mixes. The study includes casting and testing 120 cubes measured 100 mm x 100 mm x 100 mm for compressive strength at 7 days and 28 days representing mixtures of all Phases, in addition to, casting and testing 20 prisms measuring 100 mm x 100 mm x 500 mm for modulus of rupture representing mixtures of all Phases, where the replacement glass powder fine aggregate and concrete stone coarse aggregate were obtained by crushing the waste glass and waste concrete in the laboratory using the Los Angeles machine. These results suggest that adding up to 28.2% glass powder results in improved long-term strength through pozzolanic activity, while optimum silica fume content was observed as 16.1%, significantly improving both early and later compressive strengths. Similarly, using waste concrete coarse aggregate leads to a reduction in compressive strength, while it significantly enhances flexural performance; the modulus of rupture was improved by up to 81.25% at a 74% ratio of aggregate content. These test results indicate that wastes-considerably in optimized combinations offer promising routes to high-performance, sustainable concrete applicable in structural applications |
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