000			07822namaa22004451i 4500
003			EG-GICUC
005			20260210105430.0
008			260131s2025 ua a|||frm||| 000 0 eng d
040			_aEG-GICUC _cEG-GICUC _dEG-GICUC _erda _beng
041	0		_aeng _beng _bara
049			_aDeposit
082	0	4	_a620.136
092			_a620.136 _221
097			_aM.Sc
099			_aCai01.13.05.M.Sc.2025.Mo.P
100	0		_aMostafa Mohamed Ali Ahmed, _epreparation.
245	1	0	_aProperties of pervious concrete developed with different recycled aggregates / _cby Mostafa Mohamed Ali Ahmed ; Supervisors Dr. Hatem Hassan Ali, Dr. Mohamed Karam Hussein Ismail, Dr. Mohamed Samy Youssef.
246	1	5	_aخصائص الخرسانة المُنفذة المُصنعة باستخدام أنواع مختلفة من الركام المعاد تدويره
264		0	_c2025.
300			_a80 pages : _billustrations ; _c30 cm. + _eCD.
336			_atext _2rda content
337			_aUnmediated _2rdamedia
338			_avolume _2rdacarrier
502			_aThesis (M.Sc)-Cairo University, 2025.
504			_aBibliography: pages 73-80.
520		3	_aPervious concrete (PC) is receiving growing interest as a sustainable paving material due to its high permeability, making it ideal for stormwater management, reducing surface runoff, and enhancing groundwater recharge in urban environments. Incorporating construction and demolition waste (CDW) materials while manufacturing PC through replacing aggregates rather than disposal makes it a sustainable material with dual environmental benefits. However, the use of such recycling materials can influence the performance of PC, which is already characterized by relatively low mechanical strength. Therefore, it's crucial to carefully identify the properties of recycled aggregate pervious concrete (RA-PC) and the appropriate use of these properties. Contributing to this, the study focuses on the use of both recycled crushed clay brick (RCCB) and recycled crushed concrete (RCC) as waste materials replacing both coarse and fine aggregates in pervious concrete (PC). The quality of both parent materials was relatively high compared to those obtained from old demolition waste. Since they were selected not only upon their availability as waste materials, but also upon their quality. A total of eighteen mixtures were prepared over two consecutive stages with eight mixtures were fully developed using recycled crushed clay brick (RCCB) in stage 1 and nine mixtures were fully developed using recycled crushed concrete (RCC) in stage 2 in addition to control mixture in each stage. The coarse and fine aggregates were totally replaced for both type to maximize the benefits of consuming more recycled waste, since the RA represents 70.0% of total volume of mixture constituents. Additional two control mixtures developed using natural aggregates (NA) were included for comparison. Through the developed mixtures different parameters were investigated, particularly replacing NA with RCCB and RCC, changing coarse to fine ratio (C/F) while maintaining total aggregate volume, increasing aggregate size, lowering cement content Changing aggregate to binder A/B ratio), the use of supplementary cementitious materials (SCMs), such as silica fume and metakaolin, with different percentages, and lowering the strength level of the parent concrete from which RCC was derived. A set of experimental tests were carried out to evaluate the dry density, porosity, and absorption, as well as the mechanical performance of recycled crushed clay brick pervious concrete (RCCB-PC) and recycled crushed concrete pervious concrete (RCC- PC), including compressive strength, splitting strength, flexural strength. Durability was assessed through abrasion and impact resistance. Additionally, hydrological performance was examined through infiltration test, clogging behavior and the effect of maintenance. These investigations collectively reveal that, compared to natural aggregates, the inherently higher porosity, higher irregularity and angularity of RCCB the resulting pervious concrete exhibits increased total porosity, reduced dry density, enhanced infiltration rate, greater absorption capacity, and improved resistance to clogging. With the fact that these benefits come at the expense of reduced mechanical properties. Whereas, mixtures incorporated RCC exhibited reduced porosity than conventional PC resulted in higher dry density, slight reduction in infiltration rate, modest reductions in mechanical strengths, and reduced clogging resistance. Furthermore, the mechanical properties of RCCB-PC or RCC-PC can be improved along with acceptable hydrological properties through adding more fine and cementitious content, or SCMs.
520		3	_aلقد حظي استخدام الركام المعاد تدويره، باهتمام كبير في صناعة الخرسانة في السنوات الأخيرة في إطار السعي نحو ممارسات أكثر استدامة. وفي هذا السياق، تناولت هذه الدراسة خصائص الخرسانة المُنفذة المكونة بالكامل من الركام المعاد تدويره المستخرج من الطوب الطفلي المعاد تدويره والخرسانة المعاد تدويرها. تم إعداد تسعة عشر خلطة مختلفة مع عدة متغيرات متنوعة: نوع الركام المستخدم، نسبة الركام الخشن إلى الناعم (0.9/0.1 , 0.95/0.05 , 0.85/0.15)، وعدد من المواد الأسمنتية المضافة (غبار السيليكا والميتاكاولين بنسب مختلفة) كنسبة إستبدال من وزن الأسمنت. شملت الخصائص التي تم مناقشتها خلال هذه الدراسة: مقاومة الضغط، مقاومة الشد بالانفلاق، مقاومة الانحناء، مقاومة الصدم بطريقتين مختلفتين، مقاومة الإحتكاك، الكثافة ، نسبة الفراغات ،نسبة الإمتصاص ، والنفاذية. كما تم تقييم تأثير دورات الانسداد على نفاذية الخلطات قيد الدراسة، وكما تم أيضا اقتراح بعض أساليب الصيانة وتطبيقها. وأخيرًا، تم تقييم الطاقة الكامنة في نوعي الركام المعاد تدويرهما مقارنةً بالركام الطبيعي. وقد أشارت نتائج هذه الدراسة إلى الإمكانيات الواعدة للركام المعاد تدويره - سواء الناتج من الطوب الطفلى المعاد تدويره أو الخرسانة المعاد تدويرها - في إنتاج الخرسانة المُنفذة المستدامة.
530			_aIssues also as CD.
546			_aText in English and abstract in Arabic & English.
650		0	_aConcrete
650		0	_aالخرسانة
653		1	_aPervious Concrete _arecycled crushed clay brick _arecycled crushed concrete _asilica fume _ametakaolin _amechanical properties _aimpact resistance _aabrasion resistance _ahydrological properties _aالخرسانة المُنفذة _aركام الطوب الطفلى المعاد تدويره
700	0		_aHatem Hassan Ali _ethesis advisor.
700	0		_aMohamed Karam Hussein Ismail _ethesis advisor.
700	0		_aMohamed Samy Youssef _ethesis advisor.
900			_b01-01-2025 _cHatem Hassan Ali _cMohamed Karam Hussein Ismail _cMohamed Samy Youssef _UCairo University _FFaculty of Engineering _DDepartment of Structural Engineering
905			_aShimaa _eEman Ghareb
942			_2ddc _cTH _e21 _n0
999			_c178105