Defense Presentation of Final Year
TITLE OF THE PROJECT
EVALVATING DIFFERENT FACTORS AND REMEDIES FOR BONDING BETWEEN
OLD AND NEW CONCRETE LAYERS
DEPARTMENT OF CIVIL ENGINEERINGUNIVERSITY OF ENGINEERING AND
TECHNOLOGY, PESHAWAR.
Final Year Project Presentation3rd ROUND.
Presented by:
SAJJAD AHMAD Reg# 11PWCIV3499 NOOR ULLAH Reg# 11PWCIV3521
MUHAMMAD BILAL Reg# 11PWCIV3554
Supervised by: PROF. DR. BASHIR ALAM
Assessment of bond strength via tests :
SLANT SHEAR TEST FLEXURE TEST REVIEW:
Moulds are casted and ready for testing. Test will be conducted
in 3-4 days. SCHEDULE FOR SLANT SHEAR TEST:
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.TESTS FOR
ASSESSMENT OF SHEAR STRENGTH OF BOND:
Potential factors and remedies considered. Surface Roughness.
Provision of Binding materials. provision of Wire mesh.
Mould Specification. Steel mould Dim: Width 6 Depth 6 Length
12
SLANT SHEAR TEST:
Surface roughness. Provision of Shear keys. Shear keys provided
by inserting wooden piece in concrete cast.
At Casting Time.
After DryingOUR CONSIDERATION:
Provision of Wire mesh. A wire mesh is provided at interface and
bolted in substrate via studs. Studs in the substrate is via
drilling holes. OUR CONSIDERATION:
PROJECT SCHEDULE:FLEXURAL TESTING:
GAINT CHART:
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.FLEXURE TEST ( Shear
strength):
MOULD DIMENSIONS: TESTING:
FLEXURE TEST:
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
FLEXURE TEST:
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 OKFLEXURE TEST:
FLEXURE TEST:
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.FLEXURE TEST:
One sample fully casted to check the strength of unit
casting.FLEXURE TEST:
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: Concrete Mix design:
Our consideration for remedies. Roughness. Provision of Epoxy.
Provision of Wire mesh.
FLEXURE TEST ( Shear strength):
THANK YOU!!
QUESTIONS ???
