Assignment 4th

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Concordia University *

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Civil Engineering

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Feb 20, 2024

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11/30/23, 11:21 AM Assignment 4th (LAST ASSIGNMENT) (Posted Nov 26) https://moodle.concordia.ca/moodle/mod/quiz/attempt.php?attempt=3139551&cmid=3598038 1/5 Home / My courses / BCEE-492-2232-UU / 26 November - 2 December / Assignment 4th (LAST ASSIGNMENT) (Posted Nov 26) Question 1 Not yet answered Marked out of 1.25 Question 2 Not yet answered Marked out of 1.25 Calculate the design load for a 11-ft by 9-ft concrete slab form. The slab's thickness and its concrete density are 3 in. and 159 lb/ft respectively. Several truck mixers and a truck mounted pump are used for concrete pouring. The form's weight is 5 lb/ft . Answer: 3 2 Determine the maximum allowable spacing of joists used with nominal actual 1.5-in. lumber Eastern Spruce decking if the design load is 220 lb/sq.ft. Assume the decking is continuous over two spans and the limit deflection is 1/360. ( Hint: to calculate adjusted allowable stresses, use the product of allowable unit stresses and their reduction factor for wet conditions and load duration factor ) Do your calculations up to two decimal places and insert your scientific result ( NOT the modular value) with the proper unit (e.g.: 17.08 in) Answer: 

11/30/23, 11:21 AM Assignment 4th (LAST ASSIGNMENT) (Posted Nov 26) https://moodle.concordia.ca/moodle/mod/quiz/attempt.php?attempt=3139551&cmid=3598038 2/5 Question 3 Not yet answered Marked out of 1.25 With the use of average-speed method , estimate the loose production per hour of a single-engine tractor scraper with maximum heaped volume 26 M , maximum payload 34,020 kg, and the rolling resistance 40 kg/t. Single pusher technique is used for loading the material which is common earth. The job efficiency and the operation conditions are 34min/h and average respectively. The scraper hauls the materials for 1220 m up to a 6% grade from cut to the fill and returns empty over the same route. The total area for loading, dumping, and turnaround is 153 m and level. 3 

11/30/23, 11:21 AM Assignment 4th (LAST ASSIGNMENT) (Posted Nov 26) https://moodle.concordia.ca/moodle/mod/quiz/attempt.php?attempt=3139551&cmid=3598038 3/5 Question 4 Not yet answered Marked out of 1.25 a. 69.81 b. 87.27 c. 63.15 d. 78.93 Find the expected production of a pusher-scraper operation for a long narrow earthwork job. The fleet of scrapers, to be pushed by Komatsu D155 dozers, includes 16 637D-CAT. From a similar operation, the expected production for one scraper with adequate pusher support has been 234 M /h in bank measure with estimated cycle time 5.8 min. Consider that on average one dozer may not be available for the pushing. a. 3653 b. 2674 c. 4072 d. 3744 3 

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11/30/23, 11:21 AM Assignment 4th (LAST ASSIGNMENT) (Posted Nov 26) https://moodle.concordia.ca/moodle/mod/quiz/attempt.php?attempt=3139551&cmid=3598038 4/5 Question 5 Not yet answered Marked out of 1.25 Question 6 Not yet answered Marked out of 1.25 A caterpillar D8 equipped with a single shank ripper will be used for excavating hard materials. Field test indicate that the ripper can obtain satisfactory rock fracturing to a depth of 0.61 m with one pass at 0.91 intervals. Average ripping speed for each 122-m pass is 2.4 Km/h. 0.3 min is considered as the maneuver and turn time. If the job efficiency is 0.7, what is the hourly production of this excavation? a. 932.75 b. 444.51 c. 466.38 d. 849.21 How long should it take for a 14M-Caterpillar grader to complete its job if a 5-KM road requires 3 passes for bank sloping and 3 passes for finishing based on 0.7 efficiency? Answer: 

11/30/23, 11:21 AM Assignment 4th (LAST ASSIGNMENT) (Posted Nov 26) https://moodle.concordia.ca/moodle/mod/quiz/attempt.php?attempt=3139551&cmid=3598038 5/5 Question 7 Not yet answered Marked out of 1.25 Question 8 Not yet answered Marked out of 1.25 RIBNA uses a 13.6-t vibratory roller for compacting clean granular soil. What will be the maximum production per hour if the desired soil density after compaction is 1.75 gr/cm (110 lb/ft ) and the effective roller width is 3 m? Answer: 3 3 Calculate the quantity of each ingredient by weight (in lb) required to batch a 16S mixer with no overload. A one-sack trial mix that meets specification requirements has the proportions as follows: Gravel 380 lb Sand 180 lb Water 55 lb The field excess moisture of the sand is 3% and the gravel is SSD. Cement: 238 lb, Sand: 470 lb, Gravel: 1283 lb, Water: 168 lb Cement: 238 lb, Sand: 470 lb, Gravel: 963 lb, Water: 126 lb Cement: 317 lb, Sand: 626 lb, Gravel: 963 lb, Water: 126 lb Cement: 317 lb, Sand: 626 lb, Gravel: 1283 lb, Water: 168 lb ◄ Concrete Form Design - Wall Forms - Extended version Jump to... Office Hours for reviewing your midterm - second round ► 

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