A Universal 6% Equal-Split Lime-Cement Formulation for Stabilised-Earth Wall Blocks: A Mix-Selection Computation Balancing Strength, Wet Durability, Embodied Energy and Cost

SIMULATED, NOT MEASURED. A mix-selection computation over 49 binder combinations for each of three soils (15%, 28% and 40% clay) yields one robust universal formulation for stabilised-earth wall blocks: 94.0% local soil, 3.0% cement and 3.0% hydrated lime by dry mass. For the 28% clay soil it gives, in simulation, dry strength 3.44 MPa, wet strength 2.20 MPa, embodied energy 115.9 MJ per square metre of wall and cost US$11.22 per square metre, 23.8% less embodied energy and 8.3% less cost than an 8% cement-only block. Includes the computation script and full results. Laboratory validation is required before structural use.