Construction method for producing beam and slab made of compound concrete containing demolished concrete

A construction method for producing a beam and slab made of compound concrete containing demolished concrete blocks, the method comprises the steps of

• 1) a lower rebar mesh and an upper rebar mesh for producing a beam are made respectively, wherein
• A. steps of making the lower rebar mesh comprise
• placing a number of lower L-shaped stirrups at pre-specified spacing onto a open mould, wherein each lower L-shaped stirrup is U-shaped substantially, two vertical segments have a different height, in which a shorter segment is roughly equal to ⅓ heights of a longer segment;
• and
• placing a number of bottom rebars at pre-specified spacing on horizontal segments of the lower L-shaped stirrups, and configuring a number of side bars at the vertical segments of the lower L-shaped stirrups, wherein both the bottom rebars and the side bars are orthogonal to the lower L-shaped stirrups, and are connected to the lower L-shaped stirrups rigidly at their each intersection, thereby a latticed lower rebar mesh of the beam is formed;
• B. steps of making the upper rebar mesh of beam comprise
• placing a number of upper L-shaped stirrups onto a specific mould;
• and
• placing a number of upper rebars at pre-specified spacing on horizontal segments of the upper L-shaped stirrups, and configuring other side bars at a vertical segment of the upper L-shaped stirrups, wherein both the upper rebars and the other side bars are orthogonal to the upper L-shaped stirrups, and are connected to the upper L-shaped stirrups rigidly at their each intersection, thereby a latticed upper rebar mesh of the beam is thus formed;
• 2) placing coarsely-crushed concrete blocks or segments into the lower rebar mesh, then configuring the upper rebar mesh above the lower rebar mesh, the upper rebar mesh is connected to the lower rebar mesh through a threaded sleeve, whereby a beam rebar cage is formed;
• when fresh concrete has been poured into the beam rebar cage fully, a construction of the beam made of compound concrete containing demolished concrete blocks is completed.