Full Answer
How to build a waffle slab?
The construction of waffle slabs can be done by three ways as follows. In-situ; Precast; Prefabricated; In-situ waffle slabs are constructed by pouring concrete in the site or field with proper arrangements. In case of precast waffle slab, slab panels are casted somewhere and they are joined together with proper reinforcement and concrete is filled.
What is the directional reinforcement of a waffle slab?
Apr 15, 2014 · Not only a apron or paving slab but the natural ground around which would be the clay should fall away from the waffle slab, on a sloping site towards the house the apron wont do anything water will still pond at the edge of slab or worse travel under, thats why really they should install AGI pipes along the edge to help get rid of water.
Are waffle slabs appropriate in areas of highly reactive soil?
The design of the waffle slab depends upon the total area on which the waffle slab is required. The thickness of the waffle slab is generally range from 80 mm to 100 mm.; The overall depth of the waffle slab is limited to 300 mm to 600 mm.; The width of the beam in the waffle slab ranges from 100 mm to 200 mm.; The spacing between two consecutive ribs ranges from 600 mm to …
What is the difference between thin concrete and waffle concrete?
In waffle slab design where the drop panels create a large critical shear perimeter, the factor (b o /d) has limited contribution and is traditionally neglected for simplicity and conservatism. spSlab software manual (Eq. 2-46) The two-way shear capacity for the ribbed slab is permitted to be increased by 10%.
How do you strengthen an existing slab?
Increasing the shear bearing capacity of the slab by adding steel plates strengthened by vertical screw bolts. Strengthening of the slab by post stressed reinforcement. Adding steel beams. In case of hollow slabs, reinforced concrete is added inside the holes of the slab.Oct 10, 2013
How long does a waffle slab take to cure?
about seven daysQ: How long does a waffle pod slab take to dry? A: On average, it takes about seven days for a waffle pod slab to thoroughly dry. While it does take some patience, the wait will be well worth it.Sep 20, 2020
Which slab is better waffle pod slab or raft slab?
Waffle slabs are built on top of the ground and need great drainage and really hard ground for the life of the building. Raft slab footings are dug into the ground, have more perimeter stiffness and more tolerance to poor ground conditions than waffle slabs.Apr 22, 2014
How do you reinforce a two way slab?
0:0416:50Design of Reinforced Concrete Two-way Slabs - YouTubeYouTubeStart of suggested clipEnd of suggested clipIn this video as discussed earlier the two-way slab is resting on all the four sides on beams orMoreIn this video as discussed earlier the two-way slab is resting on all the four sides on beams or columns or walls. So as it is resting on all the four sides it is bending in both x and y direction.
How long does concrete take to settle?
Your concrete should be solid enough to walk on, without leaving footprints, after anything from 24 to 48 hours. By seven days, your concrete should be cured to at least 70 percent of its full strength.Apr 22, 2019
Do waffle slabs crack?
The only type of cracking that might be different between waffle slabs compared to conventional slabs would be pure shrinkage caused by the concrete trying to shrink in volume as it cures. These cracks do not follow the mesh and sometimes start in internal corners.Jan 22, 2014
Why do builders use waffle pods?
Waffle pod slabs are innovative because they use polystyrene void formers rated for efficient thermal insulation. Waffle pod slabs are also very lightweight and much easier to handle than traditional slabs, reducing the overall amount of labour involved.Sep 20, 2020
Are waffle slabs more expensive?
Promotors of waffle slabs put forward a case that this type of slab is cheaper, there are less site works required, hence less labour and contracting costs, and that there is better insulative properties through the ground to the floor of the house. There is also less actual concrete.Mar 1, 2018
How thick should a waffle slab be?
Waffle slab design Slab depth is typically 75 mm (3 in) to 130 mm (5 in) thick. As a rule of thumb, the depth should be 1⁄24 of the span. The width of the ribs is typically 130 mm (5 in) to 150 mm (6 in), and ribs usually have steel rod reinforcements. The distance between ribs is typically 915 mm (3 ft).
How do you know if a slab is one way or two way?
If slabs may be supported by columns only, in this case, two-way action will prevail. If the ratio of long side / short side > 2 it is considered as one-way slab, and if longer side to shorter side ratio < 2 then it is considered as a two-way slab.
How many days after of a slab next floor should start?
Answer ( 1 ) The concrete slab can get its strength between a period of 3-7 days. You can keep it for a day or two more if you still want to be very sure. So, you can definitely remove the support after 14 days.
What is minimum reinforcement in slab?
Explanation: The minimum percentage of reinforcement is 0.12% of the gross cross-sectional area if HYSD bars(Fe 415) are used. The minimum percentage of reinforcement is 0.15% of the gross cross-sectional area if mild steel bars are used.
What is Waffle Slab?
Slabs required supports which is given in the form of columns so that the load coming on the slab can be transmitted through it at the foundation....
Construction of Waffle Slab
The Construction of the waffle slab is done in three ways. First is the In situ construction of the waffle slab, precast Construction and the prefa...
Waffle Slab Details
The construction of a waffle slab is generally suitable for flat areas.
Waffle Slab Advantages
1. Load bearing the capacity of waffle slab is higher than other types of the slab. 2. Waffle slabs have good structural stability. 3. The construc...
What is a Waffle Slab?
Waffle slabs are a reinforced concrete footing and slab systems constructed on the ground.
How to Ensure Waffle Slabs perform as expected
I have been asked many times by homeowners, “What can we do to ensure our waffle slab performs well?”
Are Waffle Slabs a Great Idea?
Are waffle slabs a great idea? A definite maybe. These are the sites where waffle slabs won’t work so well:
Are Waffle Slabs Best Bang for your Buck?
On the correct site with correct preparation and in non-cyclonic areas. Yes.
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More Reading
It’s not just me that has an opinion on waffle slabs. Check these links out for some more information on waffle slabs.
What is Waffle Slab?
Slabs required supports which is given in the form of columns so that the load coming on the slab can be transmitted through it at the foundation. But sometimes the columns act as an obstruction where longer space is required.
Waffle Slab Design
The design of the waffle slab depends upon the total area on which the waffle slab is required.
Construction of Waffle Slab
The Construction of the waffle slab is done in three ways. First is the In situ construction of the waffle slab, precast Construction and the prefabricated construction.
Waffle Slab Advantages
Load bearing the capacity of waffle slab is higher than other types of the slab.
Waffle Slab Disadvantages
The Formwork which is required for the construction of the waffle slab is very costly.
