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A project specifies a concrete strength of at least 3000 psi. Materials engineers will design the mix for a strength higher than that. Calculate the required average compressive strength of the mix design if the standard deviation is s = 350 psi. Estimate the modulus of elasticity of the concrete at the required average compressive strength (the calculated strength, not the given strength).
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Chapter 7 Solutions
Materials for Civil and Construction Engineers (4th Edition)
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- A simple circular curve exists with a radius of 900 ft connects the tangents of a two-lanehighway that has a posted speed limit of 45 mph. The highway curve is not superelevated,e=0. A structure is proposed on land on the inside of the curve. Assume the road is on a levelgrade. Determine the minimum distance allowable between the proposed structure and thecenterline of the curve such that the current maximum safe speed of the curve would notneed to be reducedarrow_forwardA +4.4% grade intersects with a -3.3% grade at a station (550+30) at an elevation of400 ft. If the design speed is 60 mi/h, determine:(a) the minimum length of the vertical curve using the rate of vertical curvature(b) the stations and elevations of the BVC and EVC(c) the tangent and curve elevations of BVC, full stations, and EVC(d) the station and elevation of the highest pointarrow_forwardDetermine the minimum length of a sag vertical curve if the grades are –3% and +4%. The design speed is 75 mi/h. State all assumptions used. Make sure to consider the following criteria: stopping sight distance, comfort, and general appearancearrow_forward
- Question 6: Chlorine is widely used to purify municipal water supplies and to treat swimming pool waters. Suppose that the volume of a particular sample of Cl₂ gas is 8.70 L at 895 torr and 24°C. (a) How many grams of Cl₂ are in the sample? ⚫ Atomic mass of CI = 35.453 g/mol • Molar mass of Cl₂ = 2 x 35.453 = 70.906 g/mol Solution: Use the Ideal Gas Law: Step 1: Convert Given Values • Pressure: P = 895 torr → atm PV= = nRT 1 P = 895 × = 1.1789 atm 760 • Temperature: Convert to Kelvin: T24273.15 = 297.15 K • Gas constant: R = 0.0821 L atm/mol. K Volume: V = 8.70 L Step 2: Solve for n . PV n = RT n = (1.1789)(8.70) (0.0821)(297.15) 10.25 n = = 0.420 mol 24.405 Step 3: Calculate Mass of Cl₂ Final Answer: 29.78 g of Cl₂. mass nx M mass= (0.420)(70.906) mass= 29.78 garrow_forwardPlease solve the highlighted question.arrow_forward1. Design a PVC sanitary sewer collection system for the Village of Waffle (Figure P-17-24 B, shown below) by preparing a sewer design table similar to that shown in Example 19-2 and a profile drawing similar to Figure 19-13b B. You only need to show the calculations for the pipes running along Bacon Road and Eggs Road, starting at point F and ending at Point B in the figure below. Your design should comply with the requirements specified in Chapter 30 of the 10 States Standards for Wastewater. Use the following assumptions: 0 о о Average daily flow rate is the same as average daily water demand, 9.2 m³/hr Peaking factor for peak dry weather flow is 6.2 Peak wet weather flow is equal to the peak dry weather flow plus an assumption for infiltration and inflow at 40 L/d-mm-km of pipe DODO on Ro 450 m 28 m D. 150 m Apartments D 400 m D 200 m B 250 m 0 Dogs Road ROOD625 m -120 m Syrup River 120 m 100-Year flood Point Elevation Tank 137.0 m A 130.0 m B 122.0 m C 122.3 m D 122.6 m A D 300 m…arrow_forward
- Need helparrow_forward2. Design a circular clarifier for a flow rate of 34,560 m³/d. Use a design overflow rate of 30 m³/d-m². Assume the clarifier has a center feed and a side water depth of 4.3 m. Use a feedwell detention time of 20 min. Provide the following information to support your design: • Diameter of the clarifier • Diameter and depth of the feedwell . Check the flow velocity across the sludge zone • Calculate the weir loading ratearrow_forwardName: Course: Mechanics of Deformable Bodies Investigation and Design of Axially Loaded Structural Members Date: Term: A. Objective 1. To be able to determine internal axial load on structural members 2. To be able to design structural members with axial internal reactions B. General Instruction 1. Write your solution legibly in separate sheets of clean bond paper. 2. Box your final answer in your solution. C. Situation A truss structure is an assembly of straight structural members that form triangular panels. The assembly of triangular panels makes the truss establish a rigid configuration. In a truss structure, connections are theoretically assumed to act as smooth pin; therefore, it does not resist any moment or bending. Due to this magnificent behavior, truss members only resist axial forces in the design phase that could either be compressive or tensile. Presented in the figure is a truss that is a component of a roof framing system to be constructed at the University Lucena City…arrow_forward
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