slag - soil
- slag concrete
- slag portland cement
- slag stone
- slewing crane
- sliding deck
- sliding doors
- sliding flattop
- sliding friction
- sliding resistance
- slip-form paver
- slip-form paving machine
- slipperiness
- slippery surface
- slipstream
- slit trench
- slit window
- slope
- slope grader
- slope of gradient
- slope of watershed
- sloping grizzly
- slot-type hardstanding
- slow curing bitumen
- slow curing cut-back bitumen
- SLTF
- slump cone
- slump range
- slush
- smoke pot
- smoke wind-direction indicator
- smokeless propellant
- smooth brame
- smooth meadow grass
- smooth-faced steel-wheeled roller
- smooth-wheeled roller
- smoothness of concrete pavement
- SMS
- SMT
- SMW
- snow accumulation
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