Concrete Mixer Capacity: A Complete Guide To JW350, JW500, JS500 And JS750

When choosing a concrete mixer for a block making machine, capacity is a key specification. 

But mixer capacity involves more than the number in the model name. Feeding capacity, discharge capacity, rated productivity, mixing speed, and cycle time describe different aspects of performance.

For block manufacturers, the key question is whether the mixer can supply enough concrete to keep the block making machine running without becoming a bottleneck.

This guide explains concrete mixer capacity, productivity calculation, and how to match mixer capacity with a block production line.

What Does Concrete Mixer Capacity Mean?

The termconcrete mixer capacitycan refer to more than one parameter. 

For equipment selection, it is important to distinguish betweenfeeding capacity,discharge capacity, andrated productivity.

Feeding Capacity：

Feeding capacity refers to the nominal volume that can be loaded into the mixer.

For example, ZCJK’s JS500 has an 800L feeding capacity, while the JS750 has a 1,200L feeding capacity.

Discharge Capacity：

Discharge capacity refers to the rated volume of material discharged from one batch.

Rated Productivity：

Rated productivity is usually expressed in cubic meters per hour (m³/h).

This figure is particularly important for automatic block production because the mixer must continuously supply enough mixed material to the forming machine.

How Is Concrete Mixer Production Capacity Calculated?

A simple way to understand mixer productivity is:

Theoretical hourly output ≈ discharge volume per batch × batches per hour

For example, a mixer with a 500 L discharge capacity produces approximately 0.5m³ per batch.

If the complete cycle is approximately 72 seconds: 

3,600 ÷ 72 = 50 batches per hour

Then: 

0.5 m³ × 50 batches = 25 m³/h

However, actual production is more complicated than this theoretical calculation. Charging, mixing and discharge are all part of the production cycle. 

The National Precast Concrete Association recommends considering not only daily concrete demand but also peak production demand, labor capacity and future growth when sizing a mixer.

Mix quality also matters. The American Concrete Institute notes that thorough mixing is important for achieving strength and uniformity throughout a batch, and that mixing time depends on factors including the mixer and loading conditions.

For this reason, the mixer should be selected as part of the complete production system rather than by capacity alone.

JW350 Concrete Mixer Capacity

The JW350 concrete mixer is a compact pan mixer designed for smaller-scale concrete mixing applications.

The current technical specifications of the JW350 are:

The JW350 is particularly suitable when a block manufacturer operates a smaller or semi-automatic production setup and does not require the concrete supply of a high-output fully automatic line.

A documented ZCJK configuration pairs the JW350 with the QTJ4-40, QTJ4-40A, and QTJ4-20A block making machines.

JW500 Concrete Mixer Capacity

The JW500 concrete mixer increases the discharge capacity to 500 L and is designed for applications requiring more mixing volume than the JW350.

The current technical specifications of the JW500 are:

The JW500 can be considered when the required production level is higher than a JW350-based setup, while the production system still remains within the range where a pan mixer is practical.

JS500 Concrete Mixer Capacity

The JS500 concrete mixer represents a major step up in rated hourly productivity.

The current technical specifications of the JS500 are:

The JS500 is therefore very different from the JW500 even though both mixers have a500 L discharge capacity.

JW500 vs JS500: Why Is the Output So Different?

This is one of the most important points for buyers searching forJS500 concrete mixerinformation.

The two machines have the same listed discharge capacity:

• JW500: 500 L

• JS500: 500 L

But their rated productivity is:

• JW500: 1.6 m³/h

• JS500: ≥25 m³/h

The key difference is not simply the volume of one batch. The JS500 uses atwin-shaft compulsory mixing system, while the JW500 is a pan mixer. 

The mixing process, cycle design and production-line configuration affect how quickly mixed material can be supplied.

Twin-shaft mixing as a process built around charging, mixing and discharge, with the overlapping action of two shafts creating intensive mixing and fast cycles.

For block manufacturing, this makes the JS500 better suited to production lines with significantly higher material demand.

ZCJK’s QTY4-15 automatic block machine, for example, is configured with a JS500 mixerand is rated at 57,600 standard bricks per 8-hour shift for 240×115×53mm bricks. 

JS750 Concrete Mixer Capacity

The JS750 concrete mixer is designed for higher-output production systems that require a larger batch volume and greater hourly concrete supply.

The current technical specifications of the JS750 are:

Compared with the JS500, the JS750 increases discharge capacity from 500L to 750L and rated productivity from ≥25 m³/h to ≥37.5 m³/h.

This additional concrete supply becomes important when the mixer is part of a large automatic block production line.

For example, ZCJK’s ZC1000 fully automatic block making machine is configured with a JS750 mixer, three-stage batching system, automatic pallet feeder, conveyor system and double pallet stacker. 

The ZC1000 is listed with a 12–22 second cycle time and a rated capacity of up to 118,800 standard bricks per 8-hour shift.

JW350 vs JW500 vs JS500 vs JS750: Concrete Mixer Capacity Comparison

The four models cover significantly different production requirements.

For a detailed comparison of ZCJK’s JW and JS series concrete mixers, please read: JS vs JW Concrete Mixer: Twin Shaft vs Pan Mixer for Block Making Machines

How to Match Concrete Mixer Capacity with Your Block Making Machine

Selecting a mixer begins with the block machine rather than the mixer itself.

1. Check the Block Machine's Production Target

Start with the actual target output of the forming machine.

For example, ZCJK's QTY4-15 is rated at 57,600 standard bricks per 8-hour shift, while QTJ4-40A is rated at 15,000 standard bricks per 8-hour shift for the specified standard brick configuration.

These figures show how different production lines can create very different concrete demand.

2. Consider Block Size and Mix Design

A factory producing small solid bricks does not necessarily require the same concrete volume per product as a factory producing large hollow blocks.

The required concrete volume depends on factors such as:

• block dimensions

• hollow ratio

• mix design

• aggregate grading

• moisture content

• product density

• production efficiency

For this reason, it would be inaccurate to convert mixer capacity directly into a fixed number of blocks per hour without knowing the actual material consumption per block.

3. Look at Peak Demand, Not Only Daily Demand

A factory may have the same total daily output but very different peak production requirements.

The National Precast Concrete Association gives a useful example: two plants may each require the same total daily concrete volume, but one may need that concrete within four hours while another spreads production across eight hours. 

The first plant therefore requires substantially higher peak mixer productivity.

For block production, the same principle applies. A mixer should have enough capacity and productivity to keep the forming machine supplied during its active production period.

4. Consider Future Expansion

A mixer should also be evaluated against the factory's expansion plan.

NPCA specifically identifies future capacity and growth as factors when determining mixer size.

A startup factory may choose a JW350 or JW500 for a smaller production target, while a manufacturer planning a high-output automated line may require a JS500 or JS750 from the beginning.

Which Concrete Mixer Capacity Is Right for Your Project?

There is no single mixer capacity that is suitable for every block factory.

Common ZCJK Production Configurations:

• JW350 Mixer + QTJ4-40 / QTJ4-40A / QTJ4-20A Block Making Machines

• JW500 Mixer + QTY4-18 Automatic Block Making Machine

• JS500 Mixer + QTY4-15 / QTY6-15 / QTY8-15 Fully Automatic Block Making Machines

• JS700 Mixer + ZC900 / ZC1000 / ZC1200 / ZC1500 Automatic Block Making Machines

Contact us for a customized concrete block production solution.

FAQ