Compaction in LBRC Training of Trainer Personnel on Environmentally Sound Design and Implementation of Public Works- Community Roads of the Productive Safety Net Program (PSNP)

Compaction in LBRC 1. What do we compact?  Soil during earth work on road  Gravel during road surfacing  Foundation of structures and backfill around structures (below, around and on top of pipe culvert, pipe culvert, at the back of retaining wall, any fill)  Around miscellaneous structures (scour checks, apron, riprap, etc.)

Compaction in LBRC (cont’d) 2. What other activities go with compaction?  Spreading of material like soil or gravel,  Watering of the material to be compacted,  For good compaction:  Must have optimum moisture content  Material preferably be well-graded like: Gravel 50%, Sand 40%, Silt/clay 10%

Compaction in LBRC (cont’d)  Effect of Watering:  High moisture fills voids and makes compaction difficult  Very low moisture does not wet materials and makes compaction difficult  Thus, optimum moisture content is very good for good compaction

Compaction in LBRC (cont’d) 3. What tools and light machinery are used?  Hand tools for spreading, level checking, etc.  Hand rammers for critical sections of a road and fill around structures,  For large earth work and gravel surfacing:  Tractor or animal pulled dead weight roller  Vibratory roller attached to tractor

ILO LBRC Video

Questions or comments from trainees or other trainers?

Training of Trainer Personnel on Environmentally Sound Design and Implementation of Public Works- Community Roads of the Productive Safety Net Program (PSNP) June 13-24, 2011 Ghion Ambassel Hotel Dessé, Ethiopia