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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.