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CONCRETE FORMS Most structural concrete is made by placing (also called CASTING) plastic concrete into
Figure 7-26. Typical large footing form.
Figure 7-27.-Typical footing and pier form. spaces enclosed by previously constructed FORMS. These forms are usually removed once the plastic concrete hardens into the shape outlined by the forms.Forms for concrete structures must be tight, rigid, and strong. If the forms are NOT tight, loss of water and paste may cause sand streaking as well as weakness to the concrete. The forms must be strong enough to resist the high pressure exerted by the concrete. |
 
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