1) Calculate the time required to grade and finish 30 km of road formation of 9.0 m width for two-lane road with motor grader having width of 3.0 m, using six passes with speed for each of the successive two passes as 5 kmph, 7 kmph and 9 kmph respectively. Assume machine efficiency based on operator skill, machine characteristics and working conditions as 80%. 2) Calculate number of transit mixers (TM) required for transporting concrete from central batching plant to site. The cycle time data of a 6 m³ typical transit mixers is given below: Loading time of TM = 6.0 minutes. Travel time of loaded TM to site = 30 minutes Average waiting time at site = 5.0 minutes Discharge time of concrete at site through concrete pump 15 Travel time for return trip = 24 minutes minutes. If the central batching plant having average output of 60 m³/hr is to run continuously, work out the requirement of no. of concrete pumps and TM.

1) Calculate the time required to grade and finish 30 km of road formation of 9.0 m width for two-lane road with motor grader having width of 3.0 m, using six passes with speed for each of the successive two passes as 5 kmph, 7 kmph and 9 kmph respectively. Assume machine efficiency based on operator skill, machine characteristics and working conditions as 80%. 2) Calculate number of transit mixers (TM) required for transporting concrete from central batching plant to site. The cycle time data of a 6 m³ typical transit mixers is given below: Loading time of TM = 6.0 minutes. Travel time of loaded TM to site = 30 minutes Average waiting time at site = 5.0 minutes Discharge time of concrete at site through concrete pump 15 Travel time for return trip = 24 minutes minutes. If the central batching plant having average output of 60 m³/hr is to run continuously, work out the requirement of no. of concrete pumps and TM.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Pricing Concrete Work

The concrete work in a project usually holds a high-end cost in terms of cost and value of the work. It becomes an important step in calculating the cost associated with concrete while preparing the project scale. The cost of making concrete depends on the cost of building materials, mixed materials, labor, and machinery. A concrete contractor builds structures from concrete, usually managing all the steps of the process from assembling ingredients to building a holding structure and preparing the mixture. This person or team oversees the delivery and unloading of goods to ensure that they are done properly. Nowadays, most of the concrete in the United States comes from manufacturers working abroad, usually with branches and plants within the provinces. Contributions can range from pre-mixed concrete to basic ingredients, the consumer company then mixes it. Many American-based concrete companies, however, offer concrete products, such as ballads, bricks, countertop, concrete pipe, and building products, as well as concrete construction and installation materials. This article covers both types of suppliers for this set of building materials.

Question

1) Calculate the time required to
grade and finish 30 km of road
formation of 9.0 m width for two-lane
road with motor grader having width
of 3.0 m, using six passes with speed
for each of the successive two
passes as 5 kmph, 7 kmph and 9
kmph respectively. Assume machine
efficiency based on operator skill,
machine characteristics and working
conditions as 80%.
2) Calculate number of transit mixers
(TM) required for transporting
concrete from central batching plant
to site. The cycle time data of a 6 m³
typical transit mixers is given below:
Loading time of TM = 6.0 minutes.
Travel time of loaded TM to site = 30 minutes
Average waiting time at site = 5.0 minutes
Discharge time of concrete at site through
concrete pump 15
Travel time for return trip = 24 minutes minutes.
If the central batching plant having average
output of 60 m³/hr is to run continuously, work
out the requirement of no. of concrete pumps
and TM.

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