Concrete mix design:
a more transparent laboratory.

The decision

Build a workspace that connects requirements, material data, proposed proportions and measured trials. A useful result explains which quantities changed, what remained fixed, and which project limit governed the outcome. The strongest opportunity is an understandable experimental workflow, rather than another grade-to-ratio lookup.

This review covers 16 representative software tools and accessible standards, manuals, publisher previews and original research. It is broad coverage across web, mobile, producer QC and scientific software, not an inventory of every application worldwide. Paid applications were not installed or tested. Paid books were consulted only through legitimate previews or publisher pages; access limits are recorded below. Sources were accessed on 6 September 2026.

The homepage remains an India-first IS 10262:2019 preliminary proportioning tool for normal-weight, non-air-entrained M10–M60 concrete. International methods inform the workflow; they are not silently mixed into the IS engine. There is no universal perfect recipe: constituent properties, workability, exposure, variability, curing and measured performance change the feasible design.

What the evidence changes

Make the control’s promise explicit

Changing a ratio has different consequences depending on what is fixed. At fixed free water, binder demand is W/r. At fixed binder, water is rB. Minimum content and exposure limits can prevent the requested condition; the interface must show the requested and actual values. CME documents these alternative modes, while Stonemont illustrates constrained blend objectives and comparisons. Our fixed-quantity experiment is an implementation decision inferred from those workflows. CME 2024 manual · Stonemont mix design

Separate a calculated scenario from a tested batch

NIST COST designs experiments, asks the user to perform physical batches and tests, and then analyzes the entered outcomes. ACI describes calculated proportions as starting approximations requiring laboratory and field verification. These support separate scenario and measurement records, not automatic approval from a generic strength curve. NIST COST, updated 2022 · ACI PRC-211.1-22 preview, §§1.3 and 3

Show moisture as a mass balance

The meaningful chain is oven-dry solids → SSD design mass → wet batch mass → free-water contribution → mixer-added water. Total moisture and absorption must share the oven-dry basis. For the error experiment, holding the original wet ticket weights fixed means actual dry-solids delivery changes too. Our diagnostic therefore does not apply a correction at the same time it illustrates the error. BRE BR 331 preview, §§1.2.1–1.2.3 · FHWA proportioning training, archived

Grading fit is one objective, not proof of good concrete

The FHWA-sponsored grading brief explains why idealized grading or minimum voids need not improve workability. It also motivates a percent-retained view, which exposes concentrations and gaps hidden by cumulative passing. We retain explicit target-fit residuals and add size-fraction bars; neither is labeled packing density or strength. Ley and Cook, Aggregate Gradations for Concrete Pavement Mixtures, 2014, pp. 1–3

Software landscape

Capabilities below are supported by vendor documentation or official research descriptions. They have not been validated by executing the products. Undated pages had no visible publication date. Legacy research descriptions establish historical methods, not current installer availability.

The suggested “Alta Cement” reference could not be identified as a scientific mix tool. UltraTech’s official home-building tools were checked, but do not establish a public scientific mix optimizer matching that description.

Standards, manuals and books: what was actually reviewed

Implemented in this release

1. A pinned experiment lab

The user pins the current design and chooses fixed water or fixed binder. An interactive SVG plots calculated binder demand against requested ratio; a keyboard slider provides the same control. A comparison table and dependency chain explain water, binder, paste, aggregates and mixer-water changes. Requested, durability-capped and actual ratios are distinct. Action-level constraints withhold application from this panel. Other warnings remain visible. A downloadable comparison preserves both snapshots and the assumptions.

2. A usable IS trial planner

A direct free-water input now replaces the table/shape/slump/reduction estimate when selected. The planner proposes a revised central trial and the two relative-ratio variations. It keeps revised water fixed and reports when code limits prevent the requested variation. It does not populate workability or strength with simulated observations. Users must measure those properties and adjust actual admixture separately.

3. A water-accounting workbench

A signed water diagram and selectable aggregate walkthrough explain SSD, oven-dry and wet masses. A separate frozen-ticket experiment changes actual stockpile moisture while retaining the old wet batch weights and mixer water. It shows the free-water error, dry-solids error and resulting ratio. Users can then apply the corrected moisture to the current design to issue updated quantities.

4. A measured trial notebook

Records include material series/source references, batch identity/date, age, specimen geometry, curing, slump, replicate strengths and actual batch free-water/binder masses. Optional measured density and actual total mass calculate yield. Matching user-declared material families and testing conditions plot together; replicate ranges are descriptive, not confidence intervals. Records retain proposed design snapshots, persist locally when browser storage is available, and support JSON backup/import and CSV export. No cloud database or AI service receives these records.

5. Grading with percent-retained context

The existing cumulative-passing editor now includes a size-fraction chart. Pan and oversize are included so the fractions total 100%. Numeric selection exposes exact blend and target values. The objective remains target matching, with no automatic packing or workability claim.

What should come later

These priorities are our synthesis, not claims that a publisher endorses this application. Retaining a narrow verified calculation scope is more valuable than adding menu options that imply unsupported concrete families.

Evidence gaps and review boundaries

BIS catalogue discovery identified an IS 456 amendment history including Amendment 6 (2024), but the official amendment PDF link returned 404 during follow-up. This release does not claim that every amendment was audited or that SCM credit constitutes conformity. BSI’s current listing was checked directly. Commercial product performance and paid-book algorithms remain unverified beyond the documents described above.

The numerical review checks independent hand-calculated proportions, fixed-quantity scenarios, infeasible constraints, moisture-ticket errors, relative ±10% trial ratios, measured yield, retained-fraction closure and notebook validation. Type checking and production export checks cover the implementation. These checks do not constitute material testing, independent engineering certification or a browser interaction audit.

Recommended working sequence

1. Establish the project brief and verify applicable standards and amendments.
2. Replace demonstration properties with material measurements and supplier evidence.
3. Select the ratio basis and calculate preliminary quantities; inspect all active limits.
4. Pin a baseline and explore a specific change with an explicit fixed quantity.
5. Prepare a moisture-corrected proposed trial, then physically batch and test it.
6. Record actual quantities, fresh properties and comparable strength specimens.
7. Review deviations, iterate and obtain project-specific technical approval before production.

Concrete Ratio is an independent learning and preliminary proportioning workspace. It is not affiliated with the software vendors or standards publishers in this report. No paid textbook or full standard is redistributed here.