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Home Construction Basics Selection of Forms
Home Construction Basics Selection of Forms
| Selection of Forms |
| Saturday, 12 April 2008 08:56 | ||||||
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Concrete mixture is generally semi-fluid that reproduces the shape of anything into which it is poured. Thus, Concrete forms should be water tight, rigid and strong enough to sustain the weight of concrete. It should be simple and economically designed in such a manner that they are easily removed and reassembled without damage to themselves or the concrete. Selection of Forms are based on: 1. Cost of the materials 2. The construction and assembling cost 3. The number of times it could be used 4. strength and resistance to pressure and tear and wear Classification of Forms: A. Materials 1. Wood 2. Metal 3. Plastic 4. Composite B. Shape 1. Straight 2. Circular, etc. C. Solid or Hollow Cast 1. Single 2. Double D. Methods of Construction 1. Ordinary 2. Unit E. Uses 1. Foundation 2. Wall 3. Steps 4. Beams and Girders 5. Slab 6. Sidewalks, etc F. Construction of Forms consist of: 1. Retaining board 2. Supporters or studs 3. Braces 4. Spacers 5. Tie wire 6. Bolts and nails G. Types of Post and Wall Form 1. Continuous 2. Full unit 3. Layer unit a. Continuous b. Sectional Forms are constantly greased before it is used. The purpose of greasing the form is to make the wood water proof. Thus, preventing the absorption of water in the concrete which causes swelling and warping. Greasing of forms also prevent adherence of concrete into the pores of the wood. Crude Oil is the most economical and satisfactory materials for this purpose. The crude oil is mixed with no. 40 motor oil to a proportion of 1:3 mixture or with varying viscosity according to the temperature. Thicker mixture is recommended on warm weather. However, greasing of forms should not be allowed after the steel bars have been set to its position. Metal forms also need oil application to prevent rust formation.
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