Properties of pervious concrete developed with different recycled aggregates /
Mostafa Mohamed Ali Ahmed,
Properties of pervious concrete developed with different recycled aggregates / خصائص الخرسانة المُنفذة المُصنعة باستخدام أنواع مختلفة من الركام المعاد تدويره by Mostafa Mohamed Ali Ahmed ; Supervisors Dr. Hatem Hassan Ali, Dr. Mohamed Karam Hussein Ismail, Dr. Mohamed Samy Youssef. - 80 pages : illustrations ; 30 cm. + CD.
Thesis (M.Sc)-Cairo University, 2025.
Bibliography: pages 73-80.
Pervious 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. لقد 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.
Text in English and abstract in Arabic & English.
Concrete
الخرسانة
Pervious Concrete recycled crushed clay brick recycled crushed concrete silica fume metakaolin mechanical properties impact resistance abrasion resistance hydrological properties الخرسانة المُنفذة ركام الطوب الطفلى المعاد تدويره
620.136
Properties of pervious concrete developed with different recycled aggregates / خصائص الخرسانة المُنفذة المُصنعة باستخدام أنواع مختلفة من الركام المعاد تدويره by Mostafa Mohamed Ali Ahmed ; Supervisors Dr. Hatem Hassan Ali, Dr. Mohamed Karam Hussein Ismail, Dr. Mohamed Samy Youssef. - 80 pages : illustrations ; 30 cm. + CD.
Thesis (M.Sc)-Cairo University, 2025.
Bibliography: pages 73-80.
Pervious 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. لقد 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.
Text in English and abstract in Arabic & English.
Concrete
الخرسانة
Pervious Concrete recycled crushed clay brick recycled crushed concrete silica fume metakaolin mechanical properties impact resistance abrasion resistance hydrological properties الخرسانة المُنفذة ركام الطوب الطفلى المعاد تدويره
620.136