BONDEK II COMPOSITE SLABS

Construction

The construction of BONDEK II composite slabs is simple, familiar and widely accepted building practice.

BONDEK II sheeting is available in long lengths, and large areas can be quickly and easily covered to form a safe working platform during construction. The sheeting can therefore provide immediate protection from the weather and safety to personnel working on the floor below and provide a relatively open area to the floor below due to minimal propping requirements.

Workers can readily acquire the skills necessary to install BONDEK II sheeting and complete construction and finishing of the composite slab.

Profile Shape

The nominal dimensions of BONDEK II profiled steel sheeting are shown in Figure 1. In the assembled state the profile comprises of two intermediate dove-tail ribs for every interlocking side-lap joint. All the exposed ribs are boldly embossed along their top.

Material Specifications

BONDEK II profiled steel sheeting is roll-formed from hot dipped, zinc-coated, high-tensile BHP ZINC HI-TEN, steel strip, generally in base metal thicknesses (BMT) of 0.75 or 1.00mm. The steel strip conforms to AS 1397 grade G550-Z200 (550 MPa minimum yield strength, 200 g/m² minimum coating mass).

In special circumstances BONDEK II may be obtained: in other base metal thicknesses; with a heavier zinc coating; and/or with a pre-painted finish to the underside.

Available Lengths

The sheets are readily available custom-cut in any length from 600mm up to 19500mm (Length Tolerance +0, -10mm). Lengths greater than 13000mm require suitable transportation and on-site handling facilities, and the hours of transportation are restricted by law. Lengths greater than 19500mm to a maximum of 25000mm are available subject to enquiry at the nearest Lysaght office.

For speed of installation, BONDEK II sheeting should generally be used in lengths covering multiple spans (handling weight permitting).

Identification of Structural Drawings

It is suggested that in areas to be covered with BONDEK II profiled steel sheeting, the sheeting could be identified as shown in Figure 2A. The conventional reinforcement may be shown using the method given in the "Reinforcement Detailing Handbook" produced by the Concrete Institute of Australia (see Figure 2B).

Fire Resistance

BONDEK II composite slabs can obtain a fire resistance level (FRL) to the requirements of the Building Code of Australia. Refer to Lysaght publication BDII-2, Part B for design details.

Corrosion Protection

Zinc-coated BONDEK II profiled steel sheeting will provide long and trouble free life without additional corrosion protection in the following applications:where building, or underside of the slab, is fully enclosed or partly exposed for brief periods, elevated exposed slabs with adequate under-floor ventilation in commercial, rural and urban areas in arid climatic zones. Where the exposed underside of BONDEK II profiled steel sheeting is subjected to a more sever corrosive environment (such as industrial, coastal and tropical or temperate climatic zones), a suitable corrosion protection system should be chosen to match. Suggested zinc corrosion protection systems for BONDEK II sheeting in different exposure classifications are given in Table 8 of Lysaght publication BDII-2, Part

A.
Alternatively, various painting systems are available which may be used in conjunction with the different zinc coating thicknesses to provide the appropriate corrosion resistance. Refer to Finishing – Painting for painting systems as recommended in the BHP Technical Information Booklet.

In any exposed application, it is necessary to ensure that BONDEK II sheeting is protected from the entry of moisture between the concrete and the sheeting. Suitable edge treatment is necessary to prevent this from occurring. Some of the methods of providing suitable edge treatment are shown in Figure 3.

Safety

The BONDEK II sheeting has bold embossments along the top of the exposed ribs. These embossments enhance safety by reducing the likelihood of workers slipping on the sheets.

In some Lysaght centres, the BONDEK II may be provided with knurling on the upper face of the flutes, which provides even further enhancement of safety against slippage.