Research Insight: Mineral Additions Can Help—but Local Trials Must Come First

A 2025 review in Open Ceramics reported that supplementary cementitious materials can refine pore structure and densify the matrix in some foamed-concrete systems, with possible strength and durability benefits. The same review noted challenges such as reduced workability or increased brittleness in some conditions. A separate 2025 review of geopolymer foam concrete similarly emphasised that precursor characteristics, foam stability, fibres and curing conditions influence the pore structure and final performance.

The engineering task is to establish each material’s function and usable proportion in the complete system. HENGDE connects that trial work to the preparation and production equipment.

The same material name can hide major variation

Two fly ashes can differ in fineness, loss on ignition, chemical composition and water demand. Slag and other powders also vary by source and processing. Storage conditions can add moisture or cause agglomeration.

Those differences can change slurry viscosity, foam stability, setting time, pumping and cutting. A replacement percentage copied from a paper or another factory may therefore produce a different result.

Before process design is frozen, the project should obtain representative samples and record the source. A laboratory certificate is useful, but it does not replace a production-oriented trial with the intended cement, water, foaming agent and curing conditions.

A four-stage trial is easier to control

HENGDE structures the assessment in four stages, with a recorded result at each step before moving to the next scale.

1. Characterise the inputs

Record material source, basic chemical or physical data available from the supplier, particle characteristics, moisture and storage condition. Identify which properties need third-party testing.

2. Run small comparative batches

Keep a control mix and change one main variable at a time. Record water demand, mixing behaviour, wet density, stability, setting and the appearance of cured samples. A result that looks good on the first day still needs later strength and durability-related checks required by the product.

3. Move to a pilot mould and cutting check

HENGDE uses the pilot stage to check slurry transfer, mould-depth behaviour, setting and the cutting window. These observations connect the small-batch formulation to the movement and timing of a production line.

4. Define the production acceptance window

Once an acceptable result is found, translate it into measurable factory controls: material quantities, water correction, mixing sequence, time limits, wet-density range, demoulding condition and sample plan. Repeat the trial enough times to identify normal variation.

Equipment must support adjustment

Water metering, mixer capacity, dosing flexibility and slurry transfer all affect the trial. A pump that handles one slurry may struggle when fineness or viscosity changes. The line should provide safe access for sampling and cleaning, and the control logic should allow authorised parameter adjustment within defined limits.

How HENGDE turns research into production settings

The cited reviews identify mechanisms to investigate. HENGDE evaluates those directions through traceable material trials and translates the results into dosing, mixing, moulding and cutting settings. Product compliance is established through the applicable standards and accredited testing for the project.

HENGDE connects local-material trials to dosing, mixing, moulding, cutting and plant layout. Contact the technical team with the proposed materials, supplier data and target product specification before selecting a final process.

Research sources

• Open Ceramics (2025) — Review of supplementary cementitious materials in foamed concrete
• Discover Concrete and Cement (2025) — Review of pore structure in geopolymer foam concrete

Research context: the cited findings describe the material systems studied. HENGDE develops project formulations from tests with the selected local inputs.