Check out the photo on page 576 of your text (Figure 14.30). This is a cool conc

Question

Check out the photo on page 576 of your text (Figure 14.30). This is a cool concrete pour, but there appears to be something really scary going on. What is the problem with this situation?

FIGURE 14.30 A two-way flat plat concrete pump tower to a nozzle at of the newly p e floor of a high-rise apartment building is poured with the aid of a at the base of the building. The concrete is delivered up a telescoping the end of an articulated boom. The column dowels in the center oured area demonstrate the ability of flat plate construction to adapt to irregular patterns and spacings of columns. (Courtesy of Sch wing America, Inc.)

Explanation / Answer

I found two problems with this picture.

1. as its casting of the slab, the slump of concrete is low and height of free fall of concrete is very fall. thence there is a chance of segregation. Generally, the free fall should not more than 3-5 feet.

2) The second one is concrete is freefalling on reinforcement. according to ACI's (ACI 304R-89) in Section 5.4.1 gives some precautions for placing of concrete. The guide says equipment should be arranged so that the concrete has an unrestricted vertical drop to the point of the placement. The stream of the concrete shouldn't be separated by permitting it to fall freely over rods, spacers, reinforcement, or other embedded materials. If forms are sufficiently open and clear so that the concrete isn't disturbed in a vertical fall into place, direct discharge without the use of hoppers, trunks, or chutes is usually desirable.

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