Types of Slab Construction

A slab is a shallow foundation that spreads the load imposed by a building over a large area. This reduces deflections and vibrations while providing fire protection and thermal storage.

To check for proper formwork, stretch a string across the top of the forms and measure to the ground in three or four spots. Avoid hot and windy days; concrete hardens quickly in these conditions.

Corrugated Slab

The corrugated slab is a type of reinforced concrete slab that uses high-tensile steel tendons to reduce the load on the concrete. This allows the slab to have a greater capacity for resisting tensile stresses, and can help reduce deflections.

This type of slab is often used in large buildings where space is limited, because it can be built more quickly than a traditional concrete slab. It is also more cost-effective than other types of slabs.

This research aims to compare the flexural performances of conventional slabs with a new type of composite slab metal decking (SMARTDEK) made of 0.75 mm and 1.0 mm thickness. This is done by performing a test that measures the flexural strength, deflection, and failure mode of the specimens under different loads. The results show that the SMARTDEK has a higher flexural strength than conventional slabs, and it also has a lower deflection and better resistance to failure. This makes it a more viable option for modern building designs.

Ribbed Slab

Ribbed slabs, also known as waffle slabs, have a grid of depressions or square pockets on the bottom surface which reduce the thickness of the slab and increase its load capacity. This system is often used in commercial and public buildings for its cost effectiveness and its aesthetically pleasing appearance from the underside. It also has advantages over flat slabs in terms of less dead load and quicker construction.

It is important to note that the ribs need a certain amount of stiffness to resist shear forces and bending moments in order to support the concrete slab. The shear stiffness of the ribs is determined by analyzing their behavior under different loading conditions. The results showed that the ribs’ stiffness in the positive moment region is higher than that of the wide-beams.

One interesting finding from these studies was that the cracking pattern observed in the ribbed slabs is different from that of solid slabs. The cracking pattern in the ribbed slabs began at the center of the loaded area and then moved radially.

Waffle Slab

Waffle slab is a structural slab that has a grid-like system on its bottom surface. It is designed to be more stable than flat slabs. It can be a great option for structures that require larger spans. It also uses less concrete and does not need internal reinforcement unless it is required. This type of slab is generally used in construction of industrial buildings.

It can be constructed in three ways: in situ, precast, and fabricated. In the first method, formwork is built and concrete is poured on-site. In the second method, a precast slab is fabricated and transported to the construction site. In the third method, a waffle slab is made in a factory.

Waffle slabs work well on sloping sites and on natural soils and controlled fill with high strength. They are not recommended for highly reactive clay sites, though. They are also not suitable for building on sites with a slope above 100mm.

Plain Slab

Plain slab construction is a concrete slab-on-grade type that relies on the concrete properties and compressive and flexural strength to support design loads. This method is a good choice for projects that do not require secondary/temperature-shrinkage reinforcement and the subgrade soil is relatively stable.

This slab can be constructed as a two-way slab on beams or as a flat slab with columns. It is usually used for large spans of 6-9m and can support a live load of 3-6KN/m2. This construction is simple to construct, but requires more formworks than other types of slab.

These slabs are designed with cores that run through the entire unit. This will decrease the slab’s self-weight and increase structural efficiency. The cores can also act as service pipes. However, these types of slabs are not suitable for seismic zones because they do not have the necessary lateral capacity. They are also vulnerable to punching shear failure. This is the result of extreme localised stress near column bases.

from Concrete Tweed Heads Solutions https://ift.tt/75fvGUr
via IFTTT