u developer requires the construction of a 4,5 rn high counterfort retaining wall. The wall has to resist a surcharge load of 15 kam2 and soil with a...

flu developer requires the construction of a 4,5 rn high counterfort retaining wall. The wall has to resist asurcharge load of 15 kam2 and soil with a density of 1255 l-zgf'm3 and an angle of internal friction of 35degrees. Extensive material testing and strict site supervision will be implemented during oonstruction of the retaining wall. The following options are to be considered: Opgion 1: Reinforced masonry The material and material properties to be used: — 39D X 19!] x 190 mm hoilovur concrete blocks. —Ciass | mortar. — Densityr of wall {units, mortar, reinforcement and concrete} = 2 sea kgfm3.fill bed and head joints are 1|] mm thick. — fcu = 2‘.) MP3.— f15If = 453 MPa for tension reinforcement. — f15If = 25C! MPa for shear reinforcement. Dflion 2: Unreinforced masonry The material and material properties to be used: — 222 x lflfi x 23 mm solid clav bricks structu rai units having a water absorption of less than 2% — lClass || mortar — Density of masonrv wall {units and mortar) = 1 EDD kgz’m3— All bed and head joints are ll] mm thick