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Reinforced Cement Concrete

Estimate the production of a single-engine two-axle wheel scraper whose travel time curves are shown in the figures in the previous slides based on the following information.

Haul road for a single pusher:

Section 1 Level loading area

Section 2. Down a 4% grade, 2000 ft for hauling

Section 4. Up a 4% grade, 2000 ft for returning

Rolling resistance 100 lb/ton

Section 3. Level dumping area

Material: Sandy clay, 3200 lb/BCY, and 2650 lb/LCY

Maximum heaped volume = 30 LCY

Maximum payload = 95000 lb

Job efficiency = 50 min/hr

Operating conditions = average

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Reinforced Cement Concrete

1.A contractor is planning to use a crawler tractor with power shift transmission to push 1,500LCY. The tractor must haul the loose material down an 8% slope, where it will be stockpiled for later removal. The contractor has measured the tractor blade load measurement: the pile length12.6 ft, the pile width 8.1 ft, and the pile height 4 ft. The tractor weighs 24,400 pounds, and the coefficient of traction is estimated to be 0.7. The average haul distance is estimated to be 300 ft.The job efficiency is 50 minutes per hour. Performance characteristics of the tractor are shown in the previous figure. (note: 1 mi/hr = 88 ft/min)

1) What is the estimated productivity of the tractor?

2) Estimate the total hours to complete the work.

3) Determine if the tractor can perform the work in the given condition above.

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Reinforced Cement Concrete

1. Why the development length requirement has to be fulfilled for flexural reinforcement?

\text { Why the ACI code limit the } \mathrm{V}_{\mathrm{s}} \text { to } V_{s m a x}=\frac{V_{u}}{\phi}-V_{c}=8 \sqrt{f_{c}^{\prime}} b_{w} d ?

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Reinforced Cement Concrete

(50 pts) The simply supported beam shown in the figure below is being designed for shear. #3 stirrups (Grade 40) are to be used.

a. Draw the factored shear envelope for Vu (20 pts)

b. Determine the resistance to shear provided by the concrete. Are there any regions where no shear stirrups are required? (15 pts)

Design the stirrup spacing required to resist the maximum shear (15 pts)с.

Design the stirrup spacing required to resist the maximum shear

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Reinforced Cement Concrete

The concrete beam bulk shear capacity, Vc, will______ when subjected to axial tensile load

a, increașe

b. decrease

2. What are the three resisting mechanisms that make up the bulk shear strength, Vc?

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Reinforced Cement Concrete

Chloride ion limits for Concrete Mix 1 should be (% by weight of cement):

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Reinforced Cement Concrete

Maximum limits on supplementary cementitious materials are appropriate for ConcreteMix:

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Reinforced Cement Concrete

The applicable exposure dasses for Concrete Mix 9 are F2, S0, W1,CL.

a) True

b) Faise

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Reinforced Cement Concrete

The applicable exposure classes for Concrete Mix7 and 8 will be different since f, for structural requirements are different for each mix.

a) True

b) False

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Reinforced Cement Concrete

The applicable exposure classes for Concrete Mix 6 are:

a) FO, SO, WO, C2

b) F1, S1, W1.C1

F2, S0, WO, CO

d) FO, SO, Wo, co

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