(d) Reflection data extracted from GPR measurements at a certain location (Location A) of an asphalt concrete (AC) pavement is shown below. The thickness of the core extracted from the Location A, where the GPR data was collected, is 18.7cm. During the same GPR survey, the amplitude of the signal surface reflection at another location (Location B) is 12,000, and the two-way GPR signal travel time within the AC wearing course is 3.012 ns. Calculate the AC wearing course thickness at Location B. 14000 12000 (4.266, 11400) AC 10000 8000 Pavement Data 6000 Base (7.162, 4556) 4000 2000 0 56769 1011 12 13 14 15 16 17 18 19 2021 Subgrade -2000 -4000 Amplitude AAN

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Types of Composite

Composite materials are formed by merging two components that have different chemical and physical properties. The merged output is termed as a composite, whose properties are completely different from the individual components. Composite materials also have better strength than the individual components.Composite materials usually have two main parts, reinforcement material, and matrix material. The matrix material acts as a binder and surrounds the fiber of another material that bears a much higher strength. This material is known as the reinforcement material. The matrix materials are usually high-strength additives resins, while the fibers of the reinforced material can be random, oriented, and in a mat format.Composite materials are also known as fiber-reinforced composite polymers because they are composed of the polymer matrix which is reinforced to laboratory-created fibers or naturally occurring fibers, such as glass fibers, carbon fibers, or aramid fibers. Under the application of external loads, the matrix material absorbs and transfers the loads to the fibers, these fibers in return provide good compressive strength, tensile strength, and stiffness to the fiber-reinforced composite materials.Depending upon the matrix and the reinforcement material, different properties can be induced to the fiber-reinforced composite materials, including good corrosion resistance properties. The most common matrix material is the resin while the glass fibers act as the reinforcement material. Strong fibers provide strength and stiffness to the composite materials while, a soft and flexible resin provides shape to the composite materials.