#concrete

Matemáticas de acero de refuerzo (varillas) como una API, calculadas local y determinísticamente. El endpoint de área calcula el área transversal de una barra de refuerzo, a = π/4·d², su masa por metro (a·7850/1e6, ρ del acero = 7850 kg/m³), el área total y la masa para un número de barras, y —dada un área de acero requerida— el número de barras necesarias y el área proporcionada. El endpoint de espaciamiento distribuye barras a lo largo de una sección: a partir del ancho, el recubrimiento, el diámetro de la barra y ya sea un espaciamiento centro a centro o un número de barras, devuelve el otro, n = piso((ancho − 2·recubrimiento − d)/espaciamiento) + 1, el área total de acero y el área por metro de ancho. El endpoint de relación calcula la relación de refuerzo ρ = As/(b·d) de una sección a partir del área de acero (o las barras) y el ancho de la sección y la profundidad efectiva, como fracción y porcentaje, el número único que determina si una viga está sub o sobrerreforzada. Todo se calcula local y determinísticamente, por lo que es instantáneo y privado. Ideal para herramientas de ingeniería estructural y de sitio, detallado de concreto reforzado, programas de doblado de barras y despiece de acero, y educación en ingeniería civil. Cálculo local puro — sin clave, sin servicio de terceros, instantáneo. En vivo, nada almacenado. 3 endpoints. Esto es geometría y cantidades de varillas; para proporciones de mezcla de concreto use una API de concreto.

api.oanor.com/rebar-api

Concrete mix-design maths as an API, computed locally and deterministically. The mix endpoint breaks down a volume of concrete into its materials from a nominal mix ratio (cement:sand:aggregate, for example 1:2:4): it applies the 1.54 dry-volume allowance, then returns the cement in cubic metres, kilograms and 50 kg bags, the sand and aggregate volumes and masses, and the water from the water-cement ratio — the complete batch for the pour. The quantity endpoint computes the concrete volume of a slab, footing, or round or square column from its dimensions, adds a wastage allowance and gives the dry material volume. The watercement endpoint solves the water-cement ratio, the water or the cement from the other two — the single most important number for concrete strength and durability. Densities used are cement 1440, sand 1600 and aggregate 1450 kg/m³, with a 50 kg cement bag. Everything is computed locally and deterministically, so it is instant and private. Ideal for construction, estimating and site-engineering tools, material take-off and ordering, DIY and builder apps, and civil-engineering education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is nominal volume-batch concrete estimating; for retaining-wall earth pressure use an earth-pressure API.

api.oanor.com/concrete-api

Construction and material estimating as an API — the everyday "how much do I need to buy" maths for building and renovation jobs, computed locally and deterministically from standard geometry and trade rules of thumb. The paint endpoint works out the litres and number of cans for a surface, allowing for the number of coats and the paint's coverage and deducting doors and windows. The tile endpoint computes how many tiles (and full boxes) a floor or wall area needs from the tile dimensions and a wastage allowance. The concrete endpoint gives the concrete volume in cubic metres, cubic yards and litres — and the number of pre-mix bags — for a slab, footing, wall or round column, with an optional batch quantity. The bricks endpoint computes how many bricks a wall needs from the brick size and mortar joint (default 215×65 mm brick with a 10 mm joint ≈ 60 bricks per square metre). Everything is computed locally and deterministically, so it is instant and private. Ideal for builders' merchants and trade apps, DIY and home-improvement tools, quoting and estimating software, and project planners. Pure local computation — no key, no third-party service, instant. Live, nothing stored. Estimates are guidance — allow for site conditions and follow the manufacturer's stated figures. 4 endpoints. This is materials estimating; for plain unit conversion use a unit-conversion API and for tyre or drivetrain maths use a tyre API.

api.oanor.com/buildcalc-api