Civil and Environmental Engineering Answers

How can we work more effectively and efficiently with vendors and suppliers?

Discuss the following: Which resources are being wasted and why?

1. Transport
2. Inventory
3. Motion
4. Waiting
5. Over-processing
6. Overproduction
7. Defects

An ascending grade of 2.1% intersects another grade at STA 12+598 whose elevation is 549m. The change in grade is -0.15% per 20m station. The two grades are to be connected by a parabolic curve 800m long. Determine the elevation (m) of the summit. 

Design Environment Pavement slab, Baguio City (severe cold climate)

Required design strength = 3000 psi Slab thickness = 12 in.

Statistical data indicate a standard deviation of compressive strength of 250 psi is expected (more than 30 samples). Only air entrainer is allowed.

Available Materials:

Air entrainer: Manufacture specification is 0.15 fl oz/1% air/100 lb cement.

Coarse aggregate: 2 in. nominal

maximum size, crushed stone

Bulk oven-dry specific gravity = 2.573 Absorption = 0.1%

Oven-dry rodded density = 120 pcf

Moisture content = 1% Fine aggregate: Natural sand

Bulk oven-dry specific gravity = 2.54

Absorption = 0.2%

Moisture Content = 3.67%

Fineness modulus = 2.68

Find the following requirements:

Required Compressive Strength Water-Cement Ratio

Coarse Aggregate Requirement

Check Aggregate Size

Air Content (Use Maximum) Slump (Use Maximum)

Water Content

Cement Requirement Admixture

Fine Aggregate Requirement Final Batch Quantities (Adjusted Summary)

Design a non-air-entrained concrete mix for a small job with a nominal maximum aggregate size of 25 mm. Show your calculations and results as follows:

a.) Masses of components to produce 2000 kg of concrete.

b.) Volumes of components to produce 1 cubic meter of concrete.

A concrete mix with a 75-mm slump, water-cement ratio of 0.50, and sand with a fineness modulus of 2.4 contains 1850 kg/m^3 of coarse aggregate and its maximum aggregate size is 25 mm.

a. Compute the required weight of coarse aggregate per cubic meter.

b. To adjust the mix so as to increase the compressive strength, the water to-cement ratio is reduced to 0.45. Will the quantity of coarse aggregate