The team in Rwanda is proceeding with construction of the latrines. We have solicited advice from structural engineers about the modifications to the latrine design and are thankful to Grace Hsuan (Drexel University professor of Civil Engineering) and Neil Yersak (EWB-MAP member, Duffield Associates) for their help in providing critical feedback about the design.
The form (angle iron beams and roofing material) is only intended to be a temporary structure to hold up the concrete. The concrete will span 2.2 meters and be 10 cm thick. The concrete is reinforced with 12mm rebar on 10 cm centers. The angle iron will be mortared into the wall.
The aggregate available in Rwanda is not the correct size (1.5" aggregate is available but we need <0.75") and we are still trying to determine how to modify the concrete recipe to accomodate.
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