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How to construct perlite backfill
The expanded perlite is not directly backfilled, but backfilled with cement mixed with cement perlite.
The proportion of cement perlite is generally around 1:8 (volume ratio).
It is called cement, which is about 150Kg. Stir 1 m3 perlite and add water appropriately.
The purpose of adding cement perlite is to fix perlite, but it has no strength.
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