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Block mix is made up of earth from two samples. One area with a high chalk content other with rich dark clay. |
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1.7cm shrinkage in 57.5 cm length means 3% shrinkage. This is great because it means the earth has not got too much clay. It is advices that more than 12% shrinkage means construction and durability of wall can become a problem. Extreme Shrinkage can cause cracks and erosion of wall. |
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shrink box test |
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Blocks left in sun for three days to dry and shrink. |
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Earth sample 1 - agricultural friend below site. |
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Earth sample 2 - above site next to termite mound, tall termite mounds are a sign of good earth for building material. |
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Earth sample 3- agricultural field next to site, ground soft and ploughed recently. |
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daub on house house two kinds - one clay based and the other with a chalk mix - protecting base of west wall, where rain approaches from |
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| drop test - compact earth into ball in hands and drop from 1.5m hight onto hard surface look at piece sizes to determine moisture good for building |
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| good level of moisture - earth breaks into medium size pieces |
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| drop test - too much moisture in earth piece remains in one |
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| hand made rammed earth block - make timber box brick size, fill with earth with right moisture content |
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| ram earth with timber element |
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| ram edges and in layers u till evenly compressed |
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| when compressed flip earth block out |
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| finished block - now leave in sun for 3 days to dry shrink and harden |
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| shrink test |
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| ram building earth into shrink box test |
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| oil box before ramming earth into box |
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| one the block is dry test strength - bridge test make gap bigger tip block brakes |
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| step test - strong in compression no give |
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| thumb can't dent block |
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| pen nib press into block - minimal penetration |
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| pen nib press into block - minimal penetration |
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