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task library
built templateconcrete-mix-designwith-tool

Target Strength Calc

Calculates the required average compressive strength for concrete mix design from the specified strength, historical standard deviation, and an explicit reliability factor. The template uses fcr = fc + max(k s, minimum margin), keeping code selection assumptions visible through numeric inputs rather than hidden standard lookup.

inputs

4 fields

context

3 archetypes

engine

with-tool

outputs

4 scored fields

contract fields

Parameter Map

4 inputs to 4 scored outputs

  • specified_strength_mpa

    float

    Specified compressive strength f'c

    20 to 100MPa

  • standard_deviation_mpa

    float

    Historical standard deviation s

    0 to 15MPa

  • k_factor

    float

    Reliability multiplier applied to the standard deviation

    1 to 2.5

  • minimum_margin_mpa

    float

    Minimum margin above specified strength

    0 to 12MPa
statistical_margin_mpatol 0.03

Statistical margin k times standard deviation

governing_margin_mpatol 0.03

Governing margin after minimum margin check

target_mean_strength_mpatol 0.03

Required average compressive strength f'cr

margin_above_specified_mpatol 0.03

Margin above specified compressive strength

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given for normal-strength concrete with good records

all fields visible
all_givenmedium

All parameters given for normal-strength mixes with varied production records

all fields visible
all_givenhard

All parameters given for high-strength or less certain production scenarios

all fields visible

scenario bands

Archetype Atlas

normal_strength_good_records

2 contexts

Normal-strength concrete with good historical production records

specified_strength_mpa25 to 40
standard_deviation_mpa2.5 to 5
k_factor1.34 to 1.65
minimum_margin_mpa3 to 5

commercial-building-slab / water-retaining-structure

normal_strength_limited_records

2 contexts

Normal-strength concrete with limited or variable production records

specified_strength_mpa25 to 50
standard_deviation_mpa5 to 9
k_factor1.65 to 2
minimum_margin_mpa5 to 8

regional-precast-yard / remote-project-batch-plant

high_strength_concrete

2 contexts

High-strength concrete mix requiring a higher control margin

specified_strength_mpa50 to 90
standard_deviation_mpa4 to 10
k_factor1.65 to 2.33
minimum_margin_mpa6 to 12

high-rise-core / bridge-precast-girder

rendered task

Generation Preview

regional-precast-yard-normal-strength-limited-records-preview

difficulty
hard
visibility
all_given
archetype
normal_strength_limited_records
site context
regional-precast-yard
instruction excerpttarget-strength-calc_calc.py

visible fields

  • specified_strength_mpa25 to 50 MPa
  • standard_deviation_mpa5 to 9 MPa
  • k_factor1.65 to 2
  • minimum_margin_mpa5 to 8 MPa

withheld schema

statistical_margin_mpagoverning_margin_mpatarget_mean_strength_mpamargin_above_specified_mpa
Normal-strength concrete with limited or variable production records. regional-precast-yard. Required outputs: statistical_margin_mpa, governing_margin_mpa, target_mean_strength_mpa, margin_above_specified_mpa