Concrete repair materials and selection criteria.ppt

Concrete repaire

1. Ali H. Al-Gadhib
by
Civil Engineering Department
KFUPM

2. Presentation Flow
•Concept of Load / Capacity Envelope
•Dimensional Incompatibility Behavior
•The Specialist Formulator
•Total Package Solution
•Concrete Repair Systems
•Criteria for Selection of Repair Materials
•Conclusions

12. The Specialist Formulator
Is one who employs materials scientists and
chemists to take basic materials from the
petrochemicals, plastics, cement, aggregate, and
other related industries and tailor them into
useful repair materials which can be applied in as
simple a manner as possible on site.

15. INVESTMENT ON R&D
Company I
4% of the total annual turnover
=
Company II
4% of the total annual turnover
=

18. Result of 46 Repair Material

19. Tensile Stress
Time
Tensile stress relief through
tensile creep

20. Elements of a cementitious ‘repair package’

21. Typical Properties
For Acrylic Reinforced Cementitious, Flexible
Waterproof Coating

22. (1) The shrinkage compensation agent is included to
counteract the natural phenomenon of contraction
due to low of moisture. These agent have two
distinct mechanism to wok at plastic.
(2) Silica fume is to impart dense matrix and enhance
water tightness or wall is increase strength.
(3) Polymer is added in powder form to increase
flexibility, adhesion, and water tightness.
(4) Microfibers to impart flowability and badge cracks.
(5) Pulverized superplasticers to increase workability
after a low which ratio. Polymer Modified Cementatious
Repair Mortar

24. •Modified cementations
•Polymer modified cementations
•Polymer fiber modified cementations
•Epoxy –base resin
•Epoxy –cementations repair
•Crack injection
•Micro concrete
•Corrosion inhibitors
•Protective systems
•External strengthening
Reinforced Concrete Repair
and it Protection Systems

25. Compressive strength (N/mm
2
) 55-110
Compressive modulus (kN/mm
2
)
Flexural strength (N/mm
2
) 25-30
Elongation at break (%) 8-17
Linear coefficient of thermal expansion per
o
C
Water absorption, 7 days at 25
o
C (5)
Maximum service temperature under load (
o
C)
Rate of development of strength at 20
o
C
Polyester resin grouts
mortars and concretes,
25-35 10
-6
50-80
2-6 hours
Polymer modified
cementitious systems
10-80
6-15
2-8
8-20 10
-6
100-300
1-7 days
Physical Properties of
Repair Materials

26. Companies of Concrete Repair
1) Degussa Company
 www.degussa.com
2) Sika Company
www.sika.com
3)Fosroc Company
www.fosroc.com

28. Indices for Durable Repair
•Repair Diffusivity
•Free Drying Shrinkage
•Free Specific Tensile Creep
•Repair Tensile Strength
•Tensile Modulus of Elasticity

33. No matter how superior the
repair material system,
it can not go beyond and bypass
the quality of workmanship