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Daily Digest Tue Nov 18 23:00:02 2003

 
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er_spsvasan
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 16

PostPosted: Mon Nov 24, 2003 1:14 am    Post subject: Daily Digest Tue Nov 18 23:00:02 2003 Reply with quote

Hello Sunil Gandhi,

1. I think that for a very large area of slab it is necessary to provide expansion joints. The spacing of expansion joints in sheltered area can be much larger than for a slab in exposed area. If the expansion joints are correctly detailed and correctly executed, they do perform satisfactorily.

2. In the earlier days chess board pattern was considered a must. But today, I think, engineers are shifting towards the alternate line method since it is faster and gives better control over the top level of the concrete. For wear resistance the surface should be hard and abrasion resistant. Vacuum dewatering, use of metallic hardeners or non-metallic hardeners are some ways of improving wear resistance

3. For the usual cases of gradeslab, when load transfer between adjacent panels is not important, it is not necessary to provide anchor dowels.

4. RCC grade slabs are required when there is a possibility of significant bending moments occurring in the grade slab. Such bending moments can occur due to heavy point loads (due to heavy vehicle wheel loads etc.) or due to pattern loads (heavy stacks and aisles alternatively)

Regards

S.P.Srinivasan
general@sefindia.org wrote:----------------------------------------------------------
From: sjgandhi@sancharnet.in
Subject: [SEFI]: Joints in slabs resting on ground
Date: 18/11/03 Time: 13:25:55
----------------------------------------------------------
Dear Colleagues,

I would like to know about provision of joints in slabs resting on ground as under.

1. For very large area of slab , is it necessary to provide expansion joints.? Do they perform
satisfactorily?

2. For cast in situ concrete panels , which method of casting viz, Line method in alternate bays or chess board pattern is preferable? what sort of filler material is suitable for contraction joints? In factory floors , abrasion of floor is prevalent. what type of material property is required for abrasion rersistant? Otherwise problem of dirt accumulation may be created.

3. For nominally reinforced rcc panels in ground for slabs, is it necessary to anchor dowels in adjacent panels?

4. Is it necessary to provide rcc slabs on ground for factory floors?

Sunil Gandhi
Structural Engineer
sjgandhi@sancharnet.in

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