Using the Formulas for Form Design, determine what the max pressure will be with the given variables. Do not use the Basic Lateral pressure formula. You are building a wall that is 8 ft tall. The concrete design calls for a mix design with a weight of 146 lb per cf, type I cement, and retarders. You are using a crane to place the concrete and you estimate that the rate of placement will be 2.08 ft per hour. The temperature of the concrete will be 87 degrees F. What is the max pressure?

To determine the maximum pressure exerted by the concrete during placement, we can use the following approach based on the properties of concrete and the rate of placement. ### Given Variables: - **Height of the wall (h)**: 8 ft - **Weight of concrete (γ)**: 146 lb/ft³ - **Rate of placement (R)**: 2.08 ft/hour - **Temperature**: 87°F (not directly needed for pressure calculation) ### Step 1: Calculate the Hydrostatic Pressure The hydrostatic pressure at the base of the wall can be calculated using the formula: \[ P = \gamma \cdot h \] Where: - \( P \) = pressure at the base (lb/ft²) - \( \gamma \) = weight of concrete (146 lb/ft³) - \( h \) = height of the wall (8 ft) ### Step 2: Calculate the Pressure Substituting the values into the formula: \[ P = 146 \, \text{lb/ft}^3 \cdot 8 \, \text{ft} = 1168 \, \text{lb/ft}^2 \] ### Step 3: Consider the Rate of Placement The rate of placement (2.08 ft/hour) affects the time the concrete has to set and gain strength, but it does not directly affect the maximum pressure calculation at the base of the wall. The maximum pressure is primarily determined by the height of the concrete and its weight. ### Conclusion The maximum pressure exerted by the concrete at the base of the wall is: \[ \text{Max Pressure} = 1168 \, \text{lb/ft}^2 \] This is the maximum pressure that will be experienced at the bottom of the wall due to the weight of the concrete.