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mix with the concrete but is forced up towards the surface where it is collected in special slurry pits, ready to be used again. As the concrete rises inside the borehole, the string is shortened to ensure that no more than 3-4 m of piping is immerged in the wet concrete at any one time. Once the concrete has reached the pre-established

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Suppose I am in space, in a 100 meter barrel strapped to one end. The barrel and I have mass 100 kg (I'm pretty light). I throw a 100 kg ball down the center of the barrel towards the other end, accelerating it to 1m/s velocity. Presumably, it takes the ball 100 seconds to reach the other end and it sticks because it is covered in velcro.

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These machine which combine a truck mixer, a concrete pump and a placing boom all in one package are ideal for supplying especially small construction sites with concrete in a quick, simple and cost-efficient way. Product Information.