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Thread rod used as rebar.

I am currently engaged in a project using aerated concrete blocks and ceiling plates, as I navigate a DIY workshop/bar construction. The dimensions of the floor area are 6 meters by 15 meters, with ceiling/floor plates measuring 600 mm in width and 215 mm in thickness. My objective is to connect these plates to create a shear diaphragm.

The design manual suggests utilizing circular reinforcement to prevent cracking between the panels, particularly recommending a diameter of 10 mm. Unfortunately, I am unable to obtain corrosion-resistant rebar, and I face challenges with welding if I manage to acquire zinc-plated rebar. However, I do have access to 3 meters lengths of zinc-plated threaded rods in 8, 10, and 12 mm diameters.

I find myself pondering the wisdom of employing 12 mm zinc-threaded rods joined with hex nuts instead of using traditional black iron/steel rebar. There are local recommendations for using black iron, but my research indicates this is inadvisable with aerated concrete, which tends to absorb moisture like a sponge, leading to corrosion issues within a mere five years. After more than 20 years without practical experience as an engineer in concrete work, I am navigating through a steep learning curve, especially with this autoclaved aerated foam concrete, which presents significant advantages over conventional materials, but also notable challenges with internal moisture migration.

RE: Thread rod used as rebar.

These rods are intended for post-installation, correct?

I could consider it permissible. However, I would caution against relying solely on a standard hex nut to effectively connect two 3-meter rods. While using it for alignment is fine, it may not adequately facilitate a 15-meter diaphragm.

RE: Thread rod used as rebar.

There is a 34 mm layer situated above the rebar grid at the panel's top, which will ensure self-support while the plates are being raised. I have excluded this from the structural calculations related to the building's walls; however, I will utilize them as the tension bottom member for a roof truss, with the steel grid handling that task.

Regarding the hex nuts, I am referring to DIN steel galvanized continuation nuts, M12 standard size, and they measure about 50 mm in length. Opting for M12 rod over 10 mm rebar provides additional metal at the joints, justifying the cost increase given the savings in labor and effort.

I should mention that a local structural engineer has validated my calculations for the building permit, though his understanding of aerated concrete seems limited. My design manual is readily available for anyone interested—it seemingly resembles a Lego construction set.

Traditionally, the approach in my area involves using hollow concrete blocks with vertical rebar and then pumping concrete to solidify it. I aspire to utilize this material for its thermal properties while enabling quick installation of the ceiling/floor plates. Additionally, it simplifies the rafter roofing process.

The specifications I've found indicate a tensile strength of 24 MPa, accommodating an ultimate roof load of 2.4 kN/m (considering both dead and live loads) even without rebar.

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