ᐅ small hole, concrete / cement volume

Hello,

I know it’s a silly question! There are hundreds of calculators, but they always round up to 0.5 cubic meters (0.5 cubic yards).

I have a small hole, 50cm (20 inches) wide × 60cm (24 inches) long × 50cm (20 inches) deep, where the ground anchor for the sunshade will be concreted into the ground.

How many 25kg (55 lb) bags of cement do I need for this? No gravel will be added.

Does anyone have experience with fast-setting concrete? It is about twice as expensive, harder, but apparently sets faster.

Thanks

A sack of concrete is about 20 liters (5 gallons). The rest is just basic math.

Or do you mean pure cement and then mix it yourself?

Hmm, it should be about 150 liters (40 gallons), which equals 6-7 bags.

Let’s see whether to mix it manually or use that quick-mix option...

HilfeHilfe schrieb:

... or this quick fix....

I know this as "flash cement" or "rapid set" and would only recommend it for very small jobs. If you’re not extremely careful, this cement can start setting already while adding the water.

Regards, Bauexperte

OKAY, well, I have a co-partner who is knowledgeable about mixing.

HilfeHilfe schrieb:
I have a small hole 50cm (20 inches) wide * 60cm (24 inches) long * 50cm (20 inches) deep where the ground anchor for the sunshade will be concreted into the ground.

Of course, the question arises whether the hole is exactly the right size, too small, or too large. Once that is clarified, I would rely on the building material supplier to provide a volume indication on the bag.

Fast-setting materials are difficult to work with, so I would avoid using them.