This is an ideal bracket that would help to bracket your composite joist to the concrete.
Sit the bracket along side the joist and attach
Some tradies would not use these brackets but countersink and drill thru the joist and fix that way. These small L-Brackets are a genuine part from the decking manufacturer
Price is PER Bracket
Comes with 2 x screws to attach to Joist
Size: 34mm wide and 27mm high (See image for all dimensions)
No concrete anchor bolts or fittings are included