Emirate Towers
Dubai (United Arab Emirates)

Routine for the BBR Network of Experts

Designers, builders, owners and users of buildings require more efficiencies today than ever before. The BBR slab post-tensioning systems offer all the stakeholders in a building project many benifits, including:

• Reduced structure depth
• Greater clear spans
• Design flexibility
• Formwork versatility
• Reduced construction costs
• Enhanced construction speed
• Improved durability
• Minimum maintenance costs

Two unique types of BBR post-tensioning systems are typically used for slab post-tensioning. The unbonded CONA CMM post-tensioning system, consist of 1, 2 or 4 seven-wire prestressing mono strands, where each strand is factory provided with a flexible corrosion inhibitor and an individual HDPE sheathing, and the bonded CONA CMF
post-tensioning system with 1 to 6 strands inside a post-grouted flat
steel or flat plastic duct. For transfer beams or areas with high loads
the CONA CMI multi-strand system is often times used as a
complimentary system.

After the concrete has reached a suitable strength, the individual strands have specified loads applied by means of a hydraulic jack and are locked in the propriety CONA CMM or CONA CMF anchorages. Stressing might be applied in stages to control creep and shrinkage of the concrete. After the stressing has been completed the excess tendon strands are cut and for the CONA CMF systems, the duct is filled with a high performance grout mixture to provide bond and corrosion protection. Differently to the CONA CMF system, the CONA CMM system remains unbonded and does not required grouting because the tendons are individually factory provided with a multi layer corrosion protection system.

Applications for the BBR Slab Post Tensioning System include:

• Residential and commercial buildings
• Industrial floor slabs on the ground
• Transfer floor structures
• Parking structures
• Water tank bases and walls
• Transverse stressing of bridge decks

To Top | Back