--- title: "Road construction technology and activities" subject: "Transportation Engineering II" chapter: 3 key: "semester_7/transportation_engineering_ii:road-construction-technology-activities" source: https://www.bctengineer.com/q/semester_7/transportation_engineering_ii/road-construction-technology-activities site: BCT Engineering --- # Road construction technology and activities Transportation Engineering II · Chapter 3: Road Construction Technology - Asked in: 2070 Chaitra, 8 marks - Video: [How Modern Roads Are Built? Highway Construction Process](https://www.youtube.com/watch?v=juWc-DpFolY) — Civil Mentors - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_7/transportation_engineering_ii/road-construction-technology-activities - Whole chapter: https://www.bctengineer.com/md/semester_7/transportation_engineering_ii/chapter-3 ## Question Define road construction technology. Describe the various activities to be performed for the road construction. ## Short answer Road construction technology is the set of methods, materials, equipment and procedures to construct a road meeting design standards economically. Activities include survey/setting out, site clearance, earthwork, drainage works, subgrade preparation, sub-base/base, surfacing, shoulders/kerbs, road furniture, and quality control/measurement. ## Answer #### Road construction technology **Road construction technology** is the set of methods, materials, tools, equipment and procedures used to build a road from the survey stage to the finished pavement, so that the road meets the design standards of strength, durability, safety, economy and time. It covers the planning of operations, the choice between labour-based and equipment-based methods (in Nepal, labour-based methods are common for rural roads), and quality control as per the specifications (Nepal DoR "Standard Specifications for Road and Bridge Works", IRC and MoRTH). #### Activities in road construction The main activities in constructing a road are: 1. **Survey and setting out** - final location survey, fixing the centre line, bench marks, and clearing limits (right of way). 2. **Site clearance** - cutting trees, removing stumps, boulders and topsoil; demolition of structures. 3. **Earthwork** - excavation in cut, hauling and filling to form the formation level; compaction of embankment in layers (150-200 mm) to 95-97 percent of Proctor density; benching and slope trimming in hills (planned using the mass haul diagram). 4. **Drainage and protection works** - side drains, catch-water drains, cross-drainage (culverts, causeways), retaining/breast walls, bioengineering for slopes. 5. **Subgrade preparation** - scarifying, watering, compacting the top 500 mm of soil to specification and checking CBR. 6. **Sub-base and base courses** - granular sub-base (GSB), WBM/WMM or stabilised base; each layer spread, watered and rolled. 7. **Surfacing** - prime coat, tack coat, bituminous binder course (DBM/BM) and wearing course (BC, premix carpet, surface dressing, Otta seal), or a cement concrete pavement slab. 8. **Shoulders and kerbs** - construction of earth/gravel shoulders, kerbs and edge drains. 9. **Road furniture and finishing** - signs, markings, guard rails, kilometre posts, plantation. 10. **Quality control and measurement** - field tests, levels, thickness, density and payment measurement, following the Nepal DoR "Standard Specifications for Road and Bridge Works" and IRC/MoRTH specifications. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Road construction technology is best defined as: A. Only the design of pavement thickness B. The set of methods, materials, tools, equipment and procedures used to build a road from survey to finished pavement C. The maintenance of roads after opening to traffic D. Only the choice of machinery for earthwork Answer: B. It covers the whole building process from survey to finished pavement, meeting design standards in strength, durability, safety, economy and time. (Key point: Definition) 2. How is an embankment compacted during earthwork? A. In a single thick lift to 80 percent Proctor density B. In layers of 150-200 mm to 95-97 percent of Proctor density C. In layers of 500 mm to 100 percent CBR D. Only by watering without rolling Answer: B. Embankment is built and compacted in thin layers (150-200 mm) to 95-97 percent of Proctor density. (Key point: Embankment compaction) 3. Which sequence of activities is correct? A. Bituminous course, subgrade, site clearance, survey B. Earthwork, survey, bituminous course, subgrade C. Survey and setting out, site clearance, earthwork, subgrade preparation, sub-base/base, bituminous courses D. Sub-base, site clearance, survey, earthwork Answer: C. Work proceeds from survey and clearing, through earthwork and subgrade, up the pavement layers to the bituminous surfacing. (Key point: Order of activities) 4. Subgrade preparation involves: A. Scarifying, watering and compacting the top 500 mm of soil to specification and checking CBR B. Laying the wearing course directly on natural soil C. Spraying tack coat on the soil D. Only removing topsoil Answer: A. The top 500 mm is scarified, watered and compacted, and CBR is checked against the specification. 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