(Figure 1) (Figure 2) CALCULATION OF UNBONDED AREA FOR INDIVIDUAL TEST UNIT ASSEMBLY Areas of exposed coated dowel bar indicate no bond to the epoxy coating. See Figure 3. Areas of exposed cured adhesive anchoring material with no concrete indicate no bond to the cement concrete. See Figure 4. Measure the maximum length and maximum width of each unbonded area to the nearest 0.1 inch. Calculate the rectangular area of each unbonded area (Area = length x width), to the nearest 0.1 in2. Add or sum all individual unbonded areas for each test unit assembly to determine the total unbonded area, for a test unit assembly to the nearest 0.1 in². AUBi, (Figure 3 Exposed epoxy coated dowel bar indicating no bond to epoxy coated dowel bar) – (Figure 4 Exposed adhesive anchoring material indicating no bond to cement concrete) – (Figure 5 Examples of samples showing minimal unbonded areas) – CALCULATION OF PERCENTAGE OF UNBONDED AREA FOR INDIVIDUAL TEST UNIT ASSEMBLY Calculate the total embedded surface area of each individual coated dowel bar, ESAD, using Equation 1. = ESAD d L (1) π where: = Embedded Surface Area of individual coated dowel bar, nearest 0.1 in2. ESAD = 3.14 π
(Figure 1) (Figure 2) CALCULATION OF UNBONDED AREA FOR INDIVIDUAL TEST UNIT ASSEMBLY Areas of exposed coated dowel bar indicate no bond to the epoxy coating. See Figure 3. Areas of exposed cured adhesive anchoring material with no concrete indicate no bond to the cement concrete. See Figure 4. Measure the maximum length and maximum width of each unbonded area to the nearest 0.1 inch. Calculate the rectangular area of each unbonded area (Area = length x width), to the nearest 0.1 in2. Add or sum all individual unbonded areas for each test unit assembly to determine the total unbonded area, AUBi, for a test unit assembly to the nearest 0.1 in². (Figure 3 – Exposed epoxy coated dowel bar indicating no bond to epoxy coated dowel bar) (Figure 4 – Exposed adhesive anchoring material indicating no bond to cement concrete) (Figure 5 – Examples of samples showing minimal unbonded areas) CALCULATION OF PERCENTAGE OF UNBONDED AREA FOR INDIVIDUAL TEST UNIT ASSEMBLY Calculate the total embedded surface area of each individual coated dowel bar, ESAD, using Equation 1. ESAD = π d L (1) where: ESAD = Embedded Surface Area of individual coated dowel bar, nearest 0.1 in2. π = 3.14