Alker is an earth-based stabilized building material produced by the addition of gypsum, lime, and water to earth with the appropriate granulometric structure and with a cohesive property. Unbaked and produced on-site either as adobe blocks or by pouring into mouldings (the rammed earth technique), it has significant economical and ecological advantages. Its physical and mechanical properties are superior to traditional earth construction materials, and are comparable to other stabilized earthen materials. The ratios of the mixture are determined in accordance with the purpose of construction. Alker has primarily been used as a wall construction material; for this purpose, the addition of 8-10% gypsum, 2.5-5% lime, and 20% water to earth produces optimum results. These ratios may change ac
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