This Presentation about Repairing and strengthening for different case-studies .

1. Ahmed Bahaa El Din Aly (15P1012)
Abdallah Shaheen Mohamed (15P1003)
Seif Ahmed Mohamed (15P1022)
Islam Mohamed El Sayed (15P1023)
Nael Hesham Ahmed (15P6015)
Mohamed Karam Sayad (15P5002)
Ahmed Essam Ali (15P1051)
Youssef Ehab Salah (15P1041)

3. Problem
 Shallow cracks.
 Spacing between non-structural
elements.
 Shear cracks.

4. Causes
 Little settlement.
 Low Quality Workmanship.

5. Repairing methods
 Tracing and uncovering cracked area.

6. Repairing methods
 Using mortar and grout

7. Repairing methods
 Using mortar and grout

8. Repairing methods
 Setting metal sheets

9. Repairing methods
 Repainting and using cellar material

10. Materials used

11. Wall Strengthening

12. Wall Strengthening

13. Wall Strengthening

14. Wall Strengthening
 Shear cracks

16. Problem
 Little Settlement.
 Cracks started to appear in the wall.

17. Inspections
 Water Immerging to check
the Cracks.
 Surveying Inspection to
check the Settlement.

18. Inspections

19. Conclusion
 There is no Cracks in any structural elements, only in the walls and
the Plaster Layers.
 Surveying also shows a slight vertical movement in the building after
the end of the immersion of the soil in the previous period.
 The building may be subjected to slight vertical movement in case of
water leakage under the foundations, which requires the use of all
types of protection to prevent water leakage.

20. Recommendations and Actions
 Backfilling the hall opposite to point one according to
project specifications.
 Construct a concrete pavement with extension 2
meters with little slope to prevent any water from
reaching under the building foundations.
 Make sure of the safety of supply and sewer systems
and dealing with any Leakages.
 Construct an Layer of Insulation (HDPE SHEET 1000
MICRON ) with suitable depth.

21. Recommendations and Actions
 Removal of the Plaster Layers with big thickness form outside walls, especially at
point 1.
 Replacement of the brick wall which have been damaged.
 Using steel sheets along the bedding area every three rows with fixation in the
columns.
 Using grout in the bedding area for the new wall.
 Using steel sheets at joining areas between the structural elements and fixing using
bolts.
 Using Concrete Lintels above the doors and the windows to prevent further
deflection and cracks.

23. Introduction
 located at Sullia in India. It was established in the year 1967.
 It experienced severe water leakages and environmental distress
leading to cracking, spalling and deterioration of the structural
members.
 The structural consultant carried out non- destructive testing on the
structures and found out that the structure is safe and need only
repair and retrofitting and even can carry the load of an additional
floor.

24. Inspection :
 Since the building was very old and located in a marine climate, the
water leakages and reinforcement corrosion were major issues.
1. There were leakages in the roof and water seepage through the
external walls.
2. The masonry were disintegrated and water was leaking through its
joints.

25. Inspection :
3. There were spalling of plaster, cracks in the masonry walls and also
cracks in the ceilings of the RCC roof.
4. There were cracks in the RCC ceilings and columns.

26. Inspection :
5. The corrosion of reinforcement led to spalling of concrete.
6. The water seepages and leakages led to growth of fungus and mosses on the
walls and the ceilings.

27. Repair of Cracks in Masonry walls
1. At those locations the plastering was chipped of and
cutting of V-grooves were made along the length of the
crack by chiseling.
2. The cleaning was made by a high pressure water jet.
3. A wire mesh was fixed along the cracks after which the
cracks were repaired by mortar.

28. Repair and Strengthening of RCC Columns, Beams
and Slabs
 The reinforcements in the most of the columns were corroded. There
was complete loss of cover concrete in some columns.
 The following steps were taken:
1. Reinforcements were exposed by chiseling properly with light weight
hammer and chisel.
2. The exposed reinforcements were properly cleaned by wire brushed
and entire concrete and steel surface were washed with water.

29. 4. Thereafter the reinforcements were applied with a rust remover
and rubbed with gunny sacks, wiped properly and washed with
high pressure water jet to wash out the traces of any residues.
5. Then the same reinforcements were applied with anti-corrosive epoxy
zinc primer to prevent further corrosion.
6. After that the distressed concrete portions were properly applied with
epoxy bonding agent for acting as an impervious layer .
Repair and Strengthening of RCC Columns, Beams
and Slabs

30. 7. Finally applied mortar consistency to build the thickness of
the cover concrete as needed.
 The ceiling surface of roof slab and beam were also repaired in
the similar manner.
Repair and Strengthening of RCC Columns, Beams
and Slabs

31. Strengthening of Masonry Columns
 This was achieved by providing steel jacketing to those masonry
columns. steel jackets were made of 4-ISA 75x75x6 and braced with
tie rod in a zigzag way.

32. External Wall Plastering and Protective
Coating
 All the external wall plasters were chipped out and replastering was done.
 It was finished with cement mortar admixed with polymer modified mortar and
finally protected with an elastomeric acrylic coating.

33. Before and After repair in distress
conditions