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Mix concrete on site

To mix concrete on site, load the mixer in order, measure the water and mix 2–3 minutes after the last material goes in. A 1.5-bag (365 L) mixer like the SQREVG-365LTS mixes a full batch each turn; how much concrete you get depends on your mix. The 2-bag SQREVG-550LTS (550 L, Honda GX390) is for big pours with a full crew.

Also called: concrete mixer, cement mixer

Field rules

Do it right the first time

01

Size the batch: bags per batch ÷ bags per m³ of your mix = m³ per batch (in 1:2:3, 1.5 bags ≈ 0.2 m³). Pour volume ÷ yield = batches.

02

Measure the water, don't eyeball it: excess water is the #1 cause of weak concrete.

03

Load in order: part of the water → gravel → cement → sand → rest of the water. Mix 2–3 minutes after the last material goes in.

04

Working indoors or near neighbors → electric mixer. No power on site → gasoline.

SIMAQ tool

Size your mix per batch

Pour volume → bags, water and mixer cycles.

1 · What are you pouring?
2 · How much concrete?
0.50m³≈ 8 barrows
Mixer

That's about ≈ 2 batches in the mixer.

● Cement● Sand● Gravel
You'll need

Cement

3.7

bags (50 kg)

Sand

0.3 m³

≈ 4 wheelbarrows

Gravel

0.4 m³

≈ 6 wheelbarrows

Water

81 L

max — don't exceed

Approximate values (dry-volume method). For structural work, follow your engineer's mix design.

Before you buy, learn

Guides for this job

Concrete mixer parts, 1.5 vs 2 sacks and loading orderSide-view diagram of a concrete mixer with six numbered parts: 1, the drum or hopper; 2, the one-piece cast-iron ring gear that turns the drum; 3, the motor, Honda or electric; 4, the anti-vibration pads under the motor; 5, the reinforced “V” chassis; 6, the grease points and gear reducer. Comparison: the 1.5-sack mixer has a 365-liter drum and a Honda GX160 or electric motor; the 2-sack mixer has 550 liters and a Honda GX390. The 1.5-sack electric mixer mixes up to 358 liters. Loading order: part of the water first, then gravel, cement, sand and the rest of the water. Mix for 2 to 3 minutes.1234561Drum (hopper)2One-piece cast-iron ring gear3Honda or electric motor4Anti-vibration pads5Reinforced “V” chassis6Grease points and gear reducer1.5 sacks2 sacksDrum365 L550 LMotorHonda GX160or electricHonda GX390The 1.5-sack electric model mixesup to 358 L per batch.Loading order1Part of the water2Gravel3Cement4Sand5Rest of the waterMix for 2–3 min
Not to scale. Capacities and motors from the SIMAQ spec sheets; loading order from the mixing lesson.

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Job: Mix concrete on site

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FAQ

What people ask before buying

Which concrete mixer is right for a small job?

For houses, extensions, small slabs and columns, the best fit is a 1.5-bag (365 L) mixer: a full mix per batch, easy to move around the site, and a small crew can keep it loaded. Pick the electric one (SQREVE-365LTS) if you have power on site and want less noise, or the gasoline one (SQREVG-365LTS, Honda GX160) if there's no grid. Move up to the 2-bag (SQREVG-550LTS, 550 L, Honda GX390) only if you have the crew and material to feed it without pauses: a big mixer you can't feed runs half-empty and doesn't make you any faster. SIMAQ mixers carry a 6-month or 500-hour warranty.

How many bags of cement go into one batch?

It depends on the mix your design calls for, not on the machine. The mixer's capacity only tells you how much volume fits per turn. Work out the cement, sand, gravel and water proportions with the calculator on this page or in the guide at simaq.pro/en/aprende/mezcla-de-concreto.

In what order do materials go into the mixer?

With the drum turning, add part of the water first, then the gravel, cement, sand and the rest of the water. Mix 2–3 minutes until color and texture are even. Empty it fully before loading the next batch.

How many batches do I need for one cubic meter?

Divide the pour volume by what each batch yields, and that depends on your mix: a 1:2:3 mix uses about 7.4 bags of 50 kg per m³, so a 1.5-bag batch yields about 0.2 m³ and 1 m³ takes about 5 batches. Size your case with the calculator on this page.

Why does my concrete come out runny or weak?

The most common mistake is eyeballing the water so the mix flows more easily. Extra water lowers the concrete's strength. Measure the water per batch and don't change it halfway through the pour.

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