63
مبادرة
#تواصل_تطوير
المحاضرة الثالثة والستون من المبادرة مع
أ.د./ دينا صادق
الأستاذ بالمركز القومي لبحوث الإسكان والبناء
بعنوان
"فرص اعادة تدوير مخلفات البناء والهدم
والمخلفات الصناعية بين الواقع والمأمول"
التاسعة مساء توقيت مكة المكرمة الأربعاء30سبتمبر2020
وذلك عبر تطبيق زووم
Meeting ID: 857 0752 0668
https://us02web.zoom.us/meeting/register/tZEqd-6trDssHNxuPHucGwIffaDnKTedXjlF
علما ان هناك بث مباشر للمحاضرة على وقناة يوتيوب
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للتواصل مع إدارة المبادرة عبر قناة تيليجرام
الرابط
https://t.me/EEAKSA
رابط اللينكدان والمكتبة الالكترونية
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رابط التسجيل العام للمحاضرات
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11. Solid wastes in Egypt
Medical wastes
0.3%
Sludge
5.0%
Construction and
demolition wastes
7.0%
Domestic wastes
24.9%
Cleaning of canals
and drainages
46.9%
Agricultural
wastes
6.0%
Industrial
wastes
10%
20. 20 - 38 mm0 - 5 mm 5 - 10 mm 14 - 20 mm10 - 14 mm
Fractions 0 - 38 mm
Presorting process
Primary screening
Primary crushing of fractions >38 mm
Magnetic separation of reinforcement
Clean pavement Contaminated demolished concrete and masonry
Secondary screening
Fractions >38 mm Fractions 0 - 38 mm
Removal of contaminants
by handpicking or
mechanical implements
Removal of contaminants
by dry or wet processing
Secondary crushing
Final screening
To remove fine materials <38 mm
To remove large objects (pieces of metal,
wood, paper, cloth, plastics)
25. Types of recycled aggregates
Concrete
content
Brick content
Type
Recycled
aggregate
by weight of recycled aggregates
≤ 20%≥ 80%Masonry rubbleRA I
≥ 90%≤ 10%Concrete rubbleRA II
≥ 50%≤ 50%
A blend of RAI
and RA II
RA III
The maximum allowable contents of contaminants in coarse and fine
recycled aggregates are based on recycled aggregate type
26. Maximum allowable contents of
contaminants in coarse RA
5% in RA III1% in RA II5% in RA I
Other foreign material (e.g.
metals, glass plastic, clay, etc)
ـــــــــــــ1% in RA IIـــــــــــــMetals
Contents above 5% to be documentedGlass
0.25% in RA III0.5% in RA II1% in RA IWood and organic materials
0.75% in RA III0.5% in RA II1% in RA IMaterials with SSD < 1000 kg/m3
5% in RA III1% in RA II10% in RA IMaterials with SSD < 1800 kg/m3
ـــــــــــــ10% in RA IIـــــــــــــMaterials with SSD < 2200 kg/m3
10% in RA III5% in RA II10% in RA IAsphalt and tar
2%2%2%Sulfates
ـــــــــــــــــــــــــــــــــــــــWater-soluble chlorides
RA IIIRA IIRA I
Maximum allowable contents
Contaminant
27. Maximum allowable contents of
contaminants in fine RA
1%
Other material (e.g. metals,
glass plastic, clay, etc)
Contents above 5% to be documentedGlass
0.5% in RA IIWood and organic materials
10% RA I
5% in RA II
10% in RA III
Asphalt and tar
2%Sulfates
ــــــــWater-soluble chlorides
Maximum allowable contentsContaminant
30. Production of load-bearing solid
cement bricks
According to ESS 1291-2005, the compressive strength for
load bearing units should not be less than 131 kg/cm2.
28up to 100%up to 100%
Casting with
compaction of
bricks
200III
28Or up to 100%up to 100%By press200I
28up to 50%up to 50%By press200I
Fine aggregate
Coarse
aggregate
Curing
period
(day)
% of recycled aggregate
Manufacture
technique
Cement
content
(kg/m3)
Options
31. Production of non-load bearing
solid cement bricks
According to ESS 1292-2005, the compressive strength for non-load
bearing units should not be less than 41.4 kg/cm2.
28up to 100%up to 100%
Casting with
compaction
of bricks
150III
2up to 100%up to 100%
Casting with
compaction
of bricks
200I
28up to 100%up to 100%By press200I
Fine
aggregate
Coarse
aggregate
Curing
period
(day)
% of recycled aggregate
Manufactur
e technique
Cement
content
(kg/m3)
Options
37. •Raw material in cement manufacture
•Manufacture of oil-well cement.
•SCM
•Making sintered fly ash lightweight aggregates.
•Insulating bricks.
•Cellular concrete bricks and block.
•Precast fly ash concrete building units.
•Fill for roads, land reclamation.
•As filler in mines, in bituminous concrete
•Stabilization of soil.
Fly ash
38. •As a SCM
•Manufacture of slag cement and super
sulphated cement
•Making expansive, oil-well, colored cement.
•As a structural fill (air-cooled slag)
•As aggregates in concrete.
Blast
furnace slag
40. • Concrete pavers can be made using recycled materials
such as washed copper slag and ceramic aggregates.
• Concrete pavers incorporating copper slag
41. Concrete pavers can be made using recycled materials
such as washed copper slag and ceramic aggregates.
Concrete pavers incorporating copper slag
42. Concrete pavers made with ceramic aggregates
Concrete blocks and bricks manufactured with ceramic aggregates
44. The Angel Building
A self-compacting concrete
containing 36% fly ash was used
in order to eliminate the need for
traditional methods of compaction
such as vibration
45. The Shard
•The Shard in London will
be the UK’s tallest building.
•The C35/45 concrete
contains a cement blend
using 70% ground
granulated blast furnace slag
(ggbs) to limit early heat
gain.
46. SALHUS High Bridge Norway
•It is a cable stayed bridge for the main span of 163 m.
•Mix: Slag cement 450 kg + silica fume 35 kg + LWA 570
kg + water 195 kg.
•In situ Average strength 73.5 MPa.
47. KUALA LUMPUR CITY CENTRE
- 450 m twin towers
- Reinforced concrete core and
columns and composite steel/concrete
deck floors.
- Mix proportions /m3 of concrete:
Cement + Fly ash = 210kg + 50kg;
Silica fume = 30 kg;
water/cement ratio = 0.27.
Admixture to produce 200 mm slump.
- Mean strength 100 Mpa
48. 3- Recycling of industrial wastes in AAM
(alkali-activated materials)
• Inorganic binder (amorphous aluminosilicate material) + alkaline
activators.
• Blast furnace slag, fly ash, metakaolin and also natural pozzolans.
• Firstly produced on a significant scale by Purdon in the 1940s.
• The worldwide awareness of this technology started to develop in
1950s with the work developed by Glukhovsky in Eastern Europe.
49. • The largest project for the use of alkali-activated material is the
construction of the Brisbane West Wellcamp Airport in 2014, with
the implementation of 40,000 cubic meters of AAM concrete. The
material was used during construction for its high strength, low
shrinkage and good workability.