Tipping slabs are constantly being replaced due to their relatively short and incredibly challenging service lives. This part of waste and recycling facilities is where large trucks bring construction debris - including broken up concrete, asphalt, tree stumps, and branches (non-residential trash), presenting a unique set of challenges. Reducing shrinkage cracking, long term structural cracking, maintaining high strength levels and minimizing joints for equipment to catch on are all high priority design requirements.
The typical slab design called for 10.5”+ thick concrete, traditionally reinforced with two layers of #5 rebar placed at 12” on center and more than 50 lbs/cyd of a steel concrete fiber to control cracking. After reviewing, the local concrete producer Branscome, Inc. and Sika representatives helped to create a value-engineered solution featuring 80 lbs/cyd of the SikaFiber® Force CS-1000 fiber and eliminating the need for traditional steel reinforcement.
The fiber, in conjunction with a 7000 psi, low-shrinkage mix design, allowed for a joint free design over the 65’ x 100’ area. Over time, this will reduce the wear and tear on equipment and personnel while helping to increase life span.
CONCRETE MIX DESIGN, LBS/CYD:
|Total Cementitious||773 lbs/cyd|
|Sika® AEA-14||0.2 oz/cwt|
|Sika® ViscoCrete®-2100||4 oz/cwt|
|Sika® ViscoFlow®-2020||4 oz/cwt|
|Sika® Control SC||25 lbs/yd|
|Sika® Control-75||40 oz/cwt|
|SikaFiber® Force CS-1000||80 lbs/cyd|