Construction workers operating concrete mixer and testing slump on building site.
Schlüsselwörter
construction,
men at work,
builder,
contractor,
engineer,
helmet,
hard hat,
concrete,
mixer,
cement,
slump,
test,
testing,
manual,
labor,
site,
building,
industry,
professional,
safety,
equipment,
tool,
scaffolding,
uniform,
work,
operation,
industrial,
infrastructure,
engineering,
civil,
masonry,
task,
teamwork,
labourer,
skill,
technician,
process,
material,
structure,
mixing,
quality,
control,
compliance,
measure,
assessment,
standard,
development,
project,
activity
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