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 150 lb per cf , type I cement, and no retarders. You are using a crane to place the concrete and you estimate that the rate of placement will be 4 ft per hour. The temperature of the concrete will be 70 degrees F . What is the max pressure?

To determine the maximum pressure exerted by the concrete on the wall 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)**: 150 lb/ft³ - **Rate of placement**: 4 ft/hour - **Temperature**: 70°F (not directly relevant for pressure calculation) ### Maximum Pressure Calculation: The maximum pressure exerted by the concrete at the base of the wall can be calculated using the formula for hydrostatic pressure, which is given by: \[ P = \gamma \cdot H \] Where: - \( P \) = pressure at the base of the wall (lb/ft²) - \( \gamma \) = unit weight of concrete (lb/ft³) - \( H \) = height of the concrete (ft) ### Step 1: Calculate the Maximum Pressure Substituting the values into the formula: \[ P = 150 \, \text{lb/ft}^3 \cdot 8 \, \text{ft} \] \[ P = 1200 \, \text{lb/ft}^2 \] ### Conclusion: The maximum pressure exerted by the concrete on the wall during placement is **1200 lb/ft²**.