--- title: "Road construction equipment, paver and bitumen sprayer" subject: "Construction Management" chapter: 4 key: "semester_8/construction_management:road-equipment-paver-sprayer" source: https://www.bctengineer.com/q/semester_8/construction_management/road-equipment-paver-sprayer site: BCT Engineering --- # Road construction equipment, paver and bitumen sprayer Construction Management · Chapter 4: Familiarization with Construction Equipments - Asked in: 2066 Magh (old course), 16 marks - Video: [Asphalt Paving Operation Training Video - Positions and Equipment](https://www.youtube.com/watch?v=j463RFDu24M) — Asphalt Testing Solutions & Engineering - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_8/construction_management/road-equipment-paver-sprayer - Whole chapter: https://www.bctengineer.com/md/semester_8/construction_management/chapter-4 ## Question Describe the different equipments used for road-construction. Explain the functions and sequence of operation of paver and bitumen sprayer. ## Short answer Road equipment includes bulldozers, excavators, graders, rollers, water tankers, crushers, hot-mix plant, bitumen sprayer, chip spreader and paver. A paver receives hot mix, conveys it to augers, and the vibrating screed levels and compacts; sprayer heats bitumen and sprays uniformly at controlled rate. Both operate in a steady sequence followed by rolling. ## Answer #### Equipment for road construction | Stage | Equipment | |---|---| | Clearing, earthwork | Bulldozer, excavator, scraper, dump truck | | Shaping | Motor grader | | Compaction | Smooth, pneumatic, vibratory, sheepsfoot rollers | | Water | Water tanker | | Aggregate | Crusher, screen, stone spreader | | Bituminous mix | Hot-mix plant, bitumen heater/boiler, pugmill | | Surfacing | Bitumen sprayer (distributor), chip spreader, paver | | Concrete road | Batching plant, slip-form paver, finishers, joint cutters | #### Paver (finisher) ```text tipper -> [hopper] -conveyor-> [auger] -> [screed] (receives hot mix) spreads levels, compacts ``` **Functions:** receives hot mix from trucks, spreads it evenly across the width, and gives the specified thickness, camber and level, with initial compaction by the vibrating screed. **Sequence of operation:** 1. Clean the base and apply a tack coat. 2. Set the screed height (thickness) and the guide wire or sensors; pre-heat the screed. 3. The tipper backs to the paver, which pushes it forward as hot mix is discharged to the hopper. 4. The conveyor feeds the mix to the augers, which spread it in front of the screed. 5. The screed levels and compacts the mat as the paver moves forward at a steady speed. 6. Rollers (breakdown, intermediate, finish) follow immediately to compact. #### Bitumen sprayer (distributor) ```text [Insulated tank + burner] pump spray bar =========truck========== ||||||||||| (nozzles spray hot bitumen) ``` **Functions:** sprays bitumen (tack coat, prime coat, surface dressing binder) uniformly over the road surface at a controlled rate (kg/m$^2$) and temperature. **Sequence:** 1. Heat the bitumen in the tank to the spraying temperature. 2. Clean the base; set the spray bar height and the nozzles. 3. Pump the bitumen through the spray bar as the truck moves at a uniform speed. 4. Check the rate of application; avoid overlap or gaps at joints. 5. Spread chippings immediately (for surface dressing) and roll. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. What is done before the paver lays hot mix? A. Spray water on the mix B. Place rollers first C. Cut joints D. Clean the base and apply a tack coat Answer: D. The first step is cleaning the base and applying tack coat. (Key point: Tack coat first) 2. When do rollers follow the paver? A. Before paving B. Never C. Immediately behind it D. After a week Answer: C. Breakdown, intermediate and finish rollers follow immediately. (Key point: Roller timing) 3. What does a bitumen sprayer do? A. Mixes concrete B. Sprays bitumen uniformly at controlled rate (kg/m^2) and temperature C. Spreads hot mix D. Compacts soil Answer: B. It applies tack, prime or binder coat at controlled rate and temperature. (Key point: Sprayer function) 4. What is the first step of bitumen sprayer sequence? A. Heat the bitumen in the tank to spraying temperature B. Spread chippings C. Roll D. Check rate Answer: A. Heating comes first; then clean base, set bar, pump, check, spread chips. (Key point: Sprayer first step) 5. What follows spraying in surface dressing? A. Wait to cool B. Excavate C. Cure with water D. Spread chippings immediately and roll Answer: D. Chippings are spread at once and rolled. 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