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العنوان
Effect of Using Waste Materials Powder on the Properties of Self Compacting Self Cured Concrete as a Cement Replacement Material /
المؤلف
Kotp, Reham Maged Hussien.
هيئة الاعداد
باحث / ريهام ماجد حسين قطب
مشرف / ليلي محمود عبدالحافظ
مشرف / ربيع علي صديق محمد
مشرف / احمد سراج فريد
مشرف / نجلاء جلال الدين فهمي
مناقش / محمد محمد محمود رشوان
مناقش / احمد البدوي سيد عبدالمنعم
الموضوع
Building materials. Building - Design and construction. Construction industry - Management.
تاريخ النشر
2022.
عدد الصفحات
137 p. :
اللغة
الإنجليزية
الدرجة
الدكتوراه
التخصص
الهندسة المدنية والإنشائية
تاريخ الإجازة
1/1/2022
مكان الإجازة
جامعة المنيا - كلية الهندسه - الهندسة المدنية
الفهرس
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Abstract

In industries such as glass and ceramic, approximately 5-10% of production is wasted in various manufacturing processes. This dumped in vacant spaces or landfilling causes environmental pollution hazardous for human health and agricultural lands. Therefore, using glass and ceramic wastes in the form of micro and nano particles as a cement replacement material (CRM) in self-compacting concrete (SCC) and self-compacted self-cured concrete (SCSCC) would benefit in protecting the environment. The investigation of this thesis was carried out in two parts. Part one: experimental analysis was performed to explore the effect of using micro waste glass (MWG) and micro waste ceramic (MWC) on the fresh and mechanical properties of SCC and SCSCC. Thus, MWG and MWC can be converted into powder form with fine particle size passing through a Sieve of 90 microns. Their chemical composition consists of Al2O3 and SiO2, making them accepted materials for cement replacement partially in SCSCC and, consequently, reducing the amount of waste. This study aims to produce SCC and SCSCC by using MWC and MWG as CRM with percentages from 0 to 50% by the binder contain of SCC. Evaluating the results of the fresh and mechanical properties tests are introduced. Results show that Increasing MWC percent led to a decrease in flowability and pass ability of SCSCC but using MWG increases it. The optimum value of MWC was 10% and 20%for MWG, this is because MWG has a higher percentage of SiO2 than in the case of MWC, which makes glass a better pozzolanic material. Using MWG as a cement replacement material gives higher strengths than using MWG. The second part of this thesis, experimental analysis was performed to explore the effect of recycling nano waste materials (NWM), such as nano waste glass (NWG) and nano waste ceramic (NWC), as an environmentally acceptable alternative binder aids in the recovery of building waste and lowers the demand for cement. Provided that SCC and SCSCC require a high powder content and are widely used in constructing engineering due to its higher flowability, which permits them to self-compact and keep consistency without separation, substituting NWM as CRM in the preparation of SCC and SCSCC is more sustainable. This study investigates the impact of substituting cement in SCC and SCSCC with nanoparticles generated in two methods. The first method is the milling process, in which glass and ceramic wastes are converted to NWM to address the issue of waste and CO2 emissions during ordinary Portland cement manufacture. The second method a chemically generated nano silica (NS) via precipitation process was also employed to compare the behavior. Several SCC mixes were created and tested utilizing nanoparticles as CRM in amounts ranging from 1% to 5%. SCC mixtures’ fresh characteristics, mechanical properties, microstructure, and corrosion rate were investigated. The testing findings demonstrated that when the NS, NWG, and NWC increased, the flowability, passing ability, and viscosity of SCC decreased while being below the European federation (EFNARC-2005) guideline range. NWM are comparable to NS, which is chemically prepared to improve SCC mechanical properties and purify the microstructure; substituting 3 percent NWG for cement increased compressive strength by 32.4 percent, while NWC3 and NS3 increased compressive strength by 17.3 percent and 26.4 percent, respectively. using NWM as CRM decreases the anodic and cathodic overpotentials and modifies the corrosion potential (Ecorr) of high-Tensile steel (HSS) embedded in SCC samples cured in sodium chloride solution to better values, in addition to decreasing the current densities of corrosion (Icorr). When SCSCC included NWC3 and NWG3, there was a significant improvement in mechanical properties, microstructure, and corrosion resistance. Where, compressive strength rose by 36% and 32% in NWG and NWC, respectively. Furthermore, the corrosion rate in NWG and NWC decreased by 87 and 82 percent, respectively.