No more dangerous mixer cleanings

Health & Safety

Blascon systems are developed to contribute to health & safety for workers.

DrumJet + ReadyJet = Prevention for hazards of confined space of mixerdrum

Characteristics

Truckmixer drum

  • Confined space (steel barrel)
  • Dissimilar shape (conical-cylindric-conical)
  • angeld about 10-15 degrees
  • sloping, slippy, steel surface to stand on
  • interior, steelblaades about 50 cm high, vertically on drumwall
  • manhole in rotation surface of drumwall
  • large charging opening at the backside

Respirable silica

Manual removal of concrete buildup from mixerdrum exceeds 2001 limits of NIOHS

Eight-hour TWA Respirable Silica Concentrations (mg/m3) for No control scenario.

Sample Date Employee ID Sample Time (m) Silica Percent 8-Hour TWA Respirable Dust Concentration (mg/m3) Silica PEL 8-Hour TWA Respirable Dust Concentration (mg/m3)
1/14/1999 Emp. #1 90* 12.2 2.79 0.70 0.34
1/14/1999 Emp. #2 90* 13.3 1.28 0.66 0.17
1/22/1999 Emp. #2 85 11.5 1.16 o.74 0.13
1/22/1999 Emp. #1 114 13.1 1.29 0.66 0.17
Geometric Mean Concentration 1.52 0.189

Abbreviations:

  • mg/m3 – milligrams per cubic meter
  • PEL – OSHA permissible exposure limit

Sample Time:

  • Represents time working in concrete drum
  • * – estimated tim working in contrete drum

Samples exceeding the OSHA PEL for respirable dust containing 1% quartz or more, are shown in bold type and samples exceeding the NIOSH REL of 0.05 mg/m3 for respirable silica are shown in bold type.

Source: NIOSH, Cincinatti; published may-31-2001
“evaluate workers exposure to respirable crystalline silica during interior cleaning of readymix concrete truck drums”

Concrete buildup PREVENTION for truckmixer mixerdrums

Blascon Office

Blascon Netherlands

Schelmanstraat 21
NL – 7575 BC  Oldenzaal

Blascon Germany

Twentestrasse 2
D – 48527  Nordhorn