Patent
Method of forming continuous pre-stressed concrete slabs
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TLDR
In this paper, a method of hollow cored concrete slabs in a continuous operation from an initial concrete material having a slump test in the range of 0.5 to 4.0 per ASTM testing is presented.Abstract:
This disclosure relates to a method of producing hollow cored concrete slabs in a continuous operation from an initial concrete material having a slump test in the range of 0.5 to 4.0 per ASTM testing. More particularly, the method of the invention is a continuous one to produce the slabs wherein they are continuously formed, vibrated and trowelled, and wherein the concrete material is extruded to produce an elongated prestressed reinforced cored concrete slab.read more
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Concrete slab forming machine
TL;DR: In this paper, a machine for forming concrete slabs by a continuous process without using conventional casting forms is described. But it requires that the consistency of the concrete mix be such that the concrete will be self-supporting before it has hardened.