Mix design request

Enter the project spec. MixLab reviews the requirements, then returns the lowest carbon recipe that meets them, ready for a trial batch.

Structural requirement

01Required strengthf′c

02Strength measured at

56 days often allows a greener mix.

03Max water to cement ratio

Use 0.45 or lower for freezing, deicing salts or seawater.

Materials

04Allowed supplementary materials Slagsteel byproduct Fly ashcoal byproduct Superplasticizeradmixture

Cement, water, sand and stone are always included.

Project requirements additional info MixLab reviews before designing

05Project name

06Structural element

07Exposure classACI 318

Sets the max w/cm and minimum f′c the recipe must meet.

08Early strength neededoptional

For form stripping, shoring removal or post tensioning.

09Placement

10Pour volume

11Max aggregate

A CO₂ per m³

0kg

B Cost per m³

C Predicted strength

Requirements review

Ask MixLab about this recipe

Built in assistant. Answers from this model and reruns it for what if questions.

A starting point for a trial batch, not a stamped design. Confirm with cylinder breaks.

Why trust this recipe

Model accuracy

Closest tested mix

Safety margin

Strength over time

MixLabCement onlyYour spec

Slag and fly ash react slowly, so the greener mix starts weaker and catches up by the test age.

How it works

Predict. Five gradient boosted tree models, trained in your browser on 1,030 measured lab tests, predict strength from the ingredients and age.
Stay inside real data. Every candidate is exactly 1 m³, uses amounts seen in real tests, and must sit close to a recipe that was actually tested.
Add the margin. The mix must reach f′c + 1.34σ, the ACI 318 approach, where σ combines tested model error and model disagreement.
Search. About 9,000 recipes are tried. MixLab returns the lowest carbon one that clears the margin, next to the leanest cement only mix.

CO₂ and price assumptions

Typical CO₂ factors on the order of the ICE database. Prices are illustrative, so enter local ones. The recipe updates when you change a value.

Limits

The data comes from one lab's family of materials, and local materials differ. Workability and durability are not predicted. Always confirm with a trial batch.

Sources

Data: I-Cheng Yeh, Cement and Concrete Research 28(12), 1998, UCI Concrete Compressive Strength dataset. Required average strength: ACI 318. Carbon factors: order of magnitude of the ICE database (University of Bath). Cement is about 8% of global CO₂: Chatham House, Making Concrete Change, 2018.