АLGASLAB SOLUTIONS FOR POST-TENSIONED SLABS

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1 АLGASLAB SOLUTIONS FOR POST-TENSIONED SLABS ANTISEISMIC DEVICES BEARINGS EXPANSION JOINTS POST TENSIONING SYSTEMS STRUCTURAL REPAIR AND MAINTENANCE

2 Re-development of Michelin complex ex-area, Trento - Client: Trento Futura S.c.a.r.l. Alga solutions for post-tensioned slabs Direct Technical evolution in the construction of post-tensioned slabs has been successfully developed over the recent years by incorporating post-tensioned tendons increasing design performance of the structures. The use of post-tensioned cables in slabs has many direct and indirect advantages: - Increased span relatively with slab loading - Increased loading relatively with slabs span - Reduction of slabs thickness - Reduction of slabs reinforcement - Reduction of slabs deformability EXPANSION JOINT SAVING AREA HEIGHT REDUCTION SAVING OF EXCAVATION 60m TYPICAL STRUCTURE WITH REINFORCEMENT WITHOUT EXPANSION JOINTS 60m STRUCTURE WITH POST-TENSIONED CABLES

3 Indirect - Reduction /elimination of the expansion joints - Reduction /elimination of concrete cracks due to reactions of tensioning, increasing durability of structures - Reduction of columns number - Reduction of the vertical loads and foundation size - Reduction of the seismic mass - Quick removal of formwork - Increased effectiveness of sealing (cracks restraint) The cables can be used for any type of construction such as small buildings, office facilities having large span slabs, parking areas at malls, even small or large industrial facilities. The post-tensioning system can be adopted to meet the demands of high performance slab design. Two possible solutions can be adopted: bonded strand cables or un-bonded cables (also called sliding cables). 1. The solution of bonded cables provides the placement of cables inside steel corrugated sheaths installed in the slab before casting. After the completion of tensioning process, the sheaths are grouted using cement grout made of cement, water and suitable additive as per approved design mix grout. 2. The solution of un-bonded cables is utilizing greased and polyethylene (PE) coated strands by means of a polyethylene sheath surrounding the strand having thickness of about 1.5 mm. The filling of voids with grease between strand and sheath, ensures an adequate protection against atmospheric conditions. The PE cables are placed directly in the slab before casting. The selection of the type of strand cables (bonded or unbonded) depends on the demands of the design approach. Post-tensioning of slabs: Centered post-tension: the cables are placed in the mid of the section obtaining a uniformly compression. This type of solution is used in order to restrain the effects of concrete shrinkage, the cracks due to thermal variations (i.e. large industrial slabs with under floor heating) or even to reduce the joints of industrial pavements and increase the resistance to bending. Post-tension with elevation geometry profile variations: commonly adopted solution for post-tensioned beams, where the elevation of the cable varies and guarantees a moment of resistance absorbing the effects of bending loads. The dimensioning of post-tensioned slabs may provide different design approach according to customer s requirements. One side or both sides tensioning can be utilized. The permanent or accidental loads can be compensated totally or partially only. The solutions are very flexible and can meet any technical requirement. Alga provides post-tension cables for cast-in-situ slabs. The anchorages proposed by Alga ranges from singlestrand (monostrand) anchorages to multi-strands anchorages. Alga slab tendons are proposed in both versions with bonded or un-bonded strands. All anchoring systems are tested in accordance with the current and valid norms and approved as per European legislation ETAG013. Alga s anchorages are applicable for the use of strands diameter ranging from 0.5 to 0.6 S as per below tables.

4 Diameter Norm Nominal diameter [mm] BARE STRAND (BONDED) Nominal Area [mm 2 ] fptk [N/mm 2 ] fp(1)k [N/mm 2 ] Weight [kg/m] Breaking load [KN] T13 EN , , T13S EN , , T15 EN , , T15S EN , , T15C EN , , Diameter Norm Nominal diameter [mm] UN BONDED STRAND WITH PE DUCT & GREASE Nominal diameter with sheath thickness 1,5mm Nominal - Area [mm 2 ] fptk [N/mm 2 ] fp(1)k [N/mm 2 ] Weight [kg/m] Breaking load [KN] T13 EN , , T13S EN ,9 16, , T15 EN ,2 18, , T15S EN ,7 19, , T15C EN ,2 18, , SINGLE-STRAND TENDONS (MONOSTRAND) The single strand tendon (monostrand) consist of a castiron element (anchorage) having an internal conical shape for nesting the strand locking wedge and a proper shape to transfer the tension loads into concrete. The anchoring unit is equipped with accessories for the proper connection between sheath and anchorage by ensuring also strand s protection. Two holes for fixing purposes of casting units to the formwork are foreseen ensuring recess proper casting and allowing tensioning operations. The fixed anchoring is usually achieved by locking the wedge inside the conical shape of casting unit and sealing the strand using a screwed protective cap. Single strand fixing detail in formwork Preassembled cables having a fixed head Cables prior of casting Single strand cables prior of tensioning

5 SINGLE-STRAND (MONOSTRAND) ANCHORAGE (type 1F13 / 1F15) LIVE ANCHORAGE water-tight connection DEAD ANCHORAGE filling mortar protective cap connecting tube coupler locking wedge spring 97 35,5 grease g asso grease cup for recess STRESSING ANCHORAGE (type F) injection tube MULTISTRAND CABLES PREFABRICATED WITH FIXED PRE-ASSEMBLED ANCHORAGE Multi-strands cables consist of a cast-iron element (anchorage) having internal conical shapes for nesting the strand locking wedges and a proper shape to transfer the tension loads into concrete. The anchoring unit is equipped with accessories for the proper connection between sheath and anchorage by ensuring also strand s protection. Two holes for fixing purposes of casting units to the formwork are foreseen ensuring recess proper casting and allowing tensioning operations. All the anchorages are available in types for use with bonded strands. A G B in aggressive environment cup for recess C cast-iron unit coupler flat duct A 3F A 4F A 5F G1 G2 H DIMENSIONS A B C G H G1 X G2 ANCHORAGE A 3F X 21 A 4F X 21 A 5F X 21 A 3F X 21 A 4F X 21 A 5F X 21

6 ANCHORAGES FIXED (type NE) ANCHORAGES FIXED (type G) injection pipe injection pipe strand s grip bulb connection connection sealant flat duct sealant flat duct L1 T13: 150 / 200 / 250 T15: 225 / 300 / / 300 / 400 W 950 W Steel plate Values of L1 & W are only for anchorages of 3, 4 & 5 strands respectively MULTI-STRAND ANCHORAGES (type F) filling mortar G A 3F A A 4F fixing plate H A 5F 70 in aggressive environment slab formwork recess filled with grease DIMENSIONS A B C G H A 3F B grease sealant ANCHORAGE A 4F A 5F A 3F A 4F A 5F

7 Multi-strand tendons Anchorages fixed in the formwork properly forming recess Tendons arrangement inside formwork prior of casting Cables over-length required for tensioning Tensioning of strand cables using a monostrand jack

8 Head Office Alga S.p.A tel fax Via dei Missaglia 97/A MILANO Italy Workshop Alga S.p.A Via per Lungavilla, MONTEBELLO DELLA BATTAGLIA (PV) Italy Printed

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