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Group 04. sajjad+noorullah+bilal
1. TITLE OF THE PROJECT
EVALVATING DIFFERENT FACTORS AND
REMEDIES FOR BONDING BETWEEN OLD
AND NEW CONCRETE LAYERS
DEPARTMENT OF CIVIL ENGINEERING
UNIVERSITY OF ENGINEERING AND TECHNOLOGY, PESHAWAR.
Final Year Project Presentation
3rd ROUND.
2. Presented by:
SAJJAD AHMAD
Reg# 11PWCIV3499
NOOR ULLAH
Reg# 11PWCIV3521
MUHAMMAD BILAL
Reg# 11PWCIV3554
Supervised by:
PROF. DR. BASHIR ALAM
3. Assessment of bond strength via tests :
SLANT SHEAR TEST
FLEXURE TEST
4. Moulds are casted and ready for testing.
Test will be conducted in 3-4 days.
SCHEDULE FOR SLANT SHEAR TEST:
5. Slant Shear Test:
The slant shear test is one of the most wide spread bond tests.
The interface is subjected to a stress state of compression
combined with shear.
Reliable and Consistent method, because it simulates a stress
state close to the actual use and failure mode of concrete.
Fig# Slant Shear Test. Fig# Slant Shear Test.
10. Scope of the test:
• In Increasing the slab thickness by overlaying of new concrete layer
over casted Concrete layer.
• In Increasing the Pavement Thickness by providing Overlay over
substrate.
Our Objective.
• We will Show that what is the effect of overlay provision over
substrate on the overall strength of member.
• How strength is varied as compared to monolithic member.
• The best remedies to strengthen the member.
12. Substrate Nominal strength 3’ * 6’:
Concrete Strength = 4 Ksi
Steel strength = 60 Ksi
• Flexure strength
• Under ACI Provisions
Min. Reinforcement = .002 b h = 0.036 in2
Max. Reinforcement = 0.0206 b d = 0.37 in2
• Select #3 Area = .11*2 = 0.22 in2 OK
13. Substrate Nominal strength:
Nominal Flexural strength
• Mu = 15.7 K-in
Under One point load test:
• Wu = 4Mu/L = 2.1 kips
• Shear capacity = 1.52 kips
• Applied Shear = 1.05 kips OK
14.
15. Substrate + Overlay Nominal strength:
Nominal Flexural strength
• Mu = 42.10 K-in
Under One point load test:
• Wu = 4Mu/L = 5.6 kips
• Shear capacity = 3.8 kips
• Applied Shear = 2.8 kips OK
Also Reinforcement is under ACI Provisions.
16. One sample fully casted to check the strength of unit casting.
17. • Capacity of mixer available at lab. Is up to 180 lbs.
• Design strength of concrete considered is 4000 psi.
• To get 4000 psi, M20 concrete MIX Ratio is 1:1.5:3
• Mould volume = 6’*6’*30’/123= 0.625 ft3
• Volume of 6 moulds = 6*0.626 = 3.75 ft3
• Calculation in Excel sheet as:
18. Our consideration for remedies.
1. Roughness.
2. Provision of Epoxy.
3. Provision of Wire mesh.