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Saudi Nidyon

Double Bearing Panel


Building technology and economical aspects that represent the peculiarity of the Saudi NIDYON system, compared to the traditional one and to heavy prefabrication methods, may be summarized as follows:

2-1 A standard ” Saudi NIDYON ” panel is flexible; it allows easy adaptation to the architectural needs of the project, allowing the execution of every plane or bent wall and roofing.

It also presents a very good workability even during the erection, (before the application of concrete), thus allowing to easily obtain the shapes of the rooms required and for the embedding networks of plumbing and electrical installations as well as for openings of whatever shapes for windows, doors, etc..

In this way, the final application of concrete with the addition of reinforcement nets where required, grants the perfect hiding of the networks as well as ensuring the “monolithic” structure of the wall. This is a great advantage in terms of time and quality of execution.

2-2 Compared with the typical, heavy, prefabricated panels the ” Saudi NIDYON ” elements, with their weight between 4 and 10 kg/sq.m approx. remain “light” up until their erection – then concrete is applied in order to complete the static function of the panel.

This characteristic allows an easy handling of the panels all through the working phases: from production to erection. This means that the work may be carried out manually by the workers without using any other equipment.

Moreover, transportation to the site allows the use of light equipment – this means a panel delivery cost not comparable with the heavy R.C. pre cast panels.

2-3 The erection of ” Saudi NIDYON” panels and their finishing phase through to the addition of structural concrete only need simple alignment and propping as well as using only common equipment, which are of easy implementation even by non-skilled workers. For instance, the addition of concrete on the outside surfaces of wall panels and on the intrados of decks and roofing may be carried out either by directly spraying the mortar, which is contained in a portable hopper or by a normal air-compressor in case the concrete turbo pump is not available for such applications.

2-4 The panel design, as well as the distribution of net wires and the cutting profile of the expanded Polystyrene allow, better than other similar solutions, the optimization of the quantity of structural components such as steel and concrete as well as their correct and mutual position inside the R.C. thickness.

2-5 The structure of a building carried out with the” Saudi NIDYON ” system can be really recognized as “monolithic” if compared with the traditional structures.

The structural continuity among the horizontal and vertical elements which delimit the rooms is assured by reinforced nets. These nets are embedded in the concrete applied in the finishing phase.

Such a characteristic offers great advantages of resistance to the structural “joints” behavior in case of typical dynamic actions such as a seismic force.

The concept of “monolithicity” can certainly be extended to the global characteristics of building thermal insulation. These structures are free of heat conduction points because of the continuous presence of the insulating material on all the surfaces which come into contact with the outside.

2-6 Generally speaking, the “Saudi NIDYON” system requires a continuous foundation, with a more rational distribution of vertical loads along the bearing perimeter and with great advantages on costs, particularly in case of one-storey buildings.

2-7 The erection of ” Saudi NIDYON ” elements is simplified, thus allowing the execution of both structural functions and thermal insulation at the same time.

Particularly, in case of double Panel walls (“DW” type), the “EPS” slabs, which are placed between the reinforcing nets, allow the best solution, as “lost forms” for the concrete casting of the wall core, thus avoiding the handling and use of normal fom1-works.

A further simplification is obtained in the case of one-storey building, as the construction of walls and roofs using only one type of Single Panel is possible.

2-8 The “EPS” panel can be correctly sized in thickness and density, so as to easily satisfy the conditions of housing comfort required by different weather conditions in the different countries.

When required (particularly in cold countries), the realization of a ” vapour barrier ” through the application of compatible paints, on the Surface of the “EPS” panel does not represent any particular difficulty.

Finally, the “Saudi NIDYON” system represents the best solution in terms of structural requirements and “housing comfort”, as well as of economic advantages which also include living costs.

In fact, when the local weather conditions requires the installation and the use of a heating system and/or air-conditioning, the contribution of the insulating power as to the energy saving win be remarkable.

Single Bearing Panels

Raw Material

This is made up of the following materials for the structural and insulating functions respectively:

A- Galvanized steel wire with a low carbon content, tensile strength above 70 kg/sq.m. The diameter is between 2.5 to 3.5 mm, according to the position in the net as well as to the strength required from the panel calculation.

The wire is supplied wound up in coils.

The carbon content must be absolutely lower than 0.10% because of the net manufacturing by welding.

Galvanized Wire is needed in order to grant an active protection of wires against possible rust, in case of fault or lack of the concrete layer protection.

B-Polystyrene beads, of certified quality and in accordance to the main rules of the producer countries, are suitable to be expanded by a blowing agent with or without additives in order to grant the “self-extinguishing” or the “improved behavior in the presence of a fire” (EPS/FR), if required.

The raw material is supplied either in drums of 125 kg, suitable to be stocked up to 6 months, or in containers (BIN) of 1000 kg, the latter having a limited life time (up to 4 weeks max.).

3-1 General Information On Expanded Polystyrene (EPS) :

Polystyrene is one of the main raw materials used, this material is known, for more than 30 years, both for its various uses and particularly for having solved the problems of thermal­ insulation in the construction of buildings.

Polystyrene with or without additives, which may improve its behavior in presence of fire, giving the characteristic of “self-extinguishing”, or “a delay in fire propagation”, is produced in Italy in accordance to UNIPLAST standard n° 7819-88 and to the trade-mark “HP” by the “Istituto Italiano Plastici” (Italian Plastics Institute).

The raw material is made up of glass-like beads of different geanulometry, according to its different use.

Polystyrene, if properly additivated (by a blowing agent) to this purpose, is expanded in two phases to obtain blocks of the required density (usually 15, 20 or 25 kg/cu.m); these blocks are then cut into slabs having the exact thickness and profile to optimize the use of steel and concrete which is added for structural purposes.

Polystyrene’s behavior relevant to water does not affect its use in housing constructions and particularly the thermal insulation properties are not affected.

In fact, water neither reacts with EPS nor passes through the closed cells; it can be absorbed, just in a small quantity, only between the residual interstices among the expanded beads. Capillary absorption and absorption of wet air is almost non-existent.

The EPS’s thermal expansion coefficient is not very important where such expansion is restrained, because the reactions are negligible on the fixed points.

However, the use of EPS slabs which should have had an adequate ageing time before erecting, is advised in order to limit further shrinkage of the material under 2 mm/m.

3-2 “EPS” Performances During Its Life Time :

EPS does not represent food for both humans and micro-organisms; this is why it neither rots nor gets moldy.

Being stable both from a chemical and a biological point of view, EPS does not represent any danger for environmental pollution both during production or application.

The tests carried out on the influences of the environmental factors, such as temperature, moisture and working stress on the EPS characteristics, show that it can grant its required performances for an indefinite period of time.

3-3 The Fire Heavier Of “EPS”

EPS as a compound of carbon and hydrogen is in nature a combustible material.

It begins its decomposition at approx. 230-260 C° with emission of inflammable vapors, but only at 450 – 500 C° does ignition takes place.

With normal EPS the flame propagation after ignition is automatic, however a remarkable quantity of oxygen and consequently of air (approx. 130 times its volume) is needed.

Such quantities of air are not immediately available when EPS is covered by the concrete layer, as in our case.

In the case of EPS/FR, properly treated with additives, the fire propagation stops when the main cause fails.

Particularly, EPS/FR burns only when exposed and in a generalized fire, giving, however, a very modest contribution in terms of energetic balance of the fire, compared to its volume mass.

The Fire Standards which mark the safety behavior of combustible materials, generally put the normal EPS at the last place of the combustible range, and the additivated EPS/FR at the first place.

Combustion can essentially develop (but in a reduced rate), in the presence of poisonous but non corrosive gases such as carbon monoxide, just as in any other wood material fire..