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Workflow Playbook
Prepare a preliminary concrete mix per cubic metre and a separate reinforcement spacing or bar-count check. Keep units, material assumptions, cover and spacing constraints, constructability, and local code review visible. Calculator results are not a stamped structural design or site safety approval.
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This workflow is for an initial concrete and reinforcement check by engineers, technicians, estimators, or students. State whether the expected result is a concrete proportion per cubic metre, a geometric bar-spacing check, or both. Keep the questions separate: concrete-mix-design estimates material quantities, while rebar-spacing-calculator relates width to spacing or bar count.
For the mix path, gather slump class, nominal maximum aggregate size, air entrainment, water-cement ratio, sand fineness modulus, and coarse-aggregate dry-rodded density. The tool uses an ACI 211.1-91 absolute-volume method for normal-weight concrete and reports per-m³ quantities. For the layout path, convert the reference width and spacing to millimetres or prepare an integer count. Record the source of each value.
Use concrete-mix-design for preliminary water, cement, sand, coarse-aggregate, air, and mass-ratio information per m³. Separately use rebar-spacing-calculator: choose Spacing to count for known b and s, or Count to spacing for known b and n. Check the displayed relationship and bars per metre. A mix proportion does not establish bar spacing, and spacing does not validate a mix.
Compare the proposed arrangement with bar diameter, cover, edge distance, layers, placing and vibration access, durability, loads, and project spacing limits. Review material suitability, trial-batch needs, and the governing code or jurisdiction with the responsible engineer. Correct unit mismatches, implausible assumptions, and rejected inputs. The final note must state that calculator output is not a stamped structural design or site safety approval.
Workflow playbook
Write the element, quantity basis, intended use, and expected result. Decide whether you need a preliminary per-m³ mix proportion, a bar-spacing or bar-count relationship, or both. Do not infer reinforcement from the mix ratio or mix proportions from spacing.
In concrete-mix-design, enter the available slump class, nominal maximum aggregate size, air entrainment choice, water-cement ratio, sand fineness modulus, and coarse-aggregate dry-rodded density. Retain the per-m³ masses and mass ratio as preliminary normal-weight concrete assumptions, not an approved batch recipe.
In rebar-spacing-calculator, use Spacing to count with width b and spacing s, or Count to spacing with width b and integer n. Confirm that lengths are in mm, the direction is intended, and bars per metre are plausible.
Use concrete-mix-design for a preliminary normal-weight mix using its ACI 211.1-91 absolute-volume inputs. Use rebar-spacing-calculator only for the geometric relationship between width and spacing or bar count; neither result determines the other.
Choose Spacing to count when width b and centre-to-centre spacing s are known. Choose Count to spacing when width b and an integer bar count n are known. Both paths use millimetres.
Cover, bar diameter, layers, edge distances, permitted spacing, congestion, placing access, durability, loads, strength, and jurisdiction-specific provisions require project review. The calculators do not approve these conditions.
Compare the arrangement with project requirements for bar diameter, cover, edge distance, layer clearance, placing and vibration access, durability, loads, and permitted spacing. Review material suitability and trial-batch or quality-control needs with the responsible engineer. Do not present the result as stamped design or site safety approval.