2. Scope of Work
2.1 Visual inspection
Perform visual inspection of representative concrete and steel structures to identify types and damaged areas such as concrete cracking and spalling, corroded of steel structure and other significant damages. Typical areas and distress are presented in photo-documentation.
The visual investigation includes the following:
2.1.1 Visual inspection of damage of structures above water level to identify extent of damage of the existing jetty. The inspection areas include concrete platform, girder, concrete piles, pile cap and main steel structure (See details in Chapter 4).
2.1.2 Visual inspection of piles above water level (See details in Chapter 4).
2.2 Non-destructive testing (NDT)
Non-Destructive Testing Technique (NDT) is used for field testing to determine the existing strength, deterioration and damage. The result will be used as input for the structural analysis to determine the existing capacity of jetty (See details in Chapter
2.2.1. Determine concrete strength by Concrete Coring Compressive Test.
2.2.2. Determine general uniformity of concrete strength and quality by Schmidt Hammer test (Rebound Hammer)
2.2.3. Determine durability of concrete by Ultra Pulse Velocity (UPV) Test.
2.2.4. Determine tensile strength of rebar by Hardness Test.
2.2.5. Determine corrosion of reinforced concrete structure by Half-Cell Potential Measurement (Corrosion Mapping).
2.2.6. Determine PH value of concrete by Carbonation Test.
2.2.7. Determine chloride attack by chloride content determination.
2.2.8. Determine sulphate attack by sulfate content determination.
2.3 Identify a need for further evaluation for structural elements, for which the information gather from the material testing results or/and visual inspection are considered to be insufficient to determine cause/effect relationships or develop repair budget figures.
2.4 Checking of jetty capacity
2.4.1. Perform structural analysis and design calculation as follows:
(a) Perform 3-D finite element analysis of jetty structure for resultants forces in structural members under existing conditions using current actual loads, actual properties and strength of material, and as-built information of the jetty
(b) Calculate full capacity of structural members
(c) Compare the resultants forces in structural members obtained from item (a) against the capacity of members from item (b) to determine capacity ratio of structural members
2.5 Establish repair priorities based on safety, structural and durability guidelines consistent with the yearly maintenance and inspection plan.
2.6 Propose the most suitable repairing method including the following activities
2.6.1. Propose repairing method and drawings of conceptual design for this improvement,
2.6.2. Prepare cost estimation for the improvement,
2.6.3. Prepare repaired specification and related documents
2.7 Prepare procedure for berthing with emphasis on safety.
2.8 Prepare the final report including findings, testing results, photo-documentation, and potential repair & inspection strategies, along with associated repair & inspection budget.