Key terms in construction technology, artificial intelligence, and the built environment — a reference for project teams exploring AI-driven workflows.
The steepest angle at which a loose, granular material — soil, sand, aggregate — can be piled before it slides under its own weight. A shallower angle needs a wider footprint to store the same volume, which is why it drives how big a stockpile has to be. Size a stockpile with our topsoil strip & stockpile volume calculator.
Computer systems capable of performing tasks — recognising patterns, generating text, interpreting drawings — that normally require human judgement. In construction, AI increasingly automates document review, quantity takeoffs and design checks. See Civils.ai's AI workflow use-cases.
A drawing revised after construction to reflect exactly what was built, including any deviations from the original design.
A sequence of tasks — document extraction, checking, reporting — carried out by software with little or no manual intervention. See how Civils.ai automates AI-driven engineering workflows.
A simplified earthworks estimating method that multiplies a zone's plan area by the difference between existing and proposed ground level to approximate its cut or fill volume — quick to apply by hand, at the cost of some accuracy versus a full surveyed grid. Try it yourself with our basic cut and fill calculator.
The volume of soil or rock as it exists undisturbed in the ground, before excavation loosens it. Material is normally quoted bank measure until it's dug, loaded or compacted, at which point its volume changes. Convert bank volume to loose or compacted with our soil bulking & swell factor calculator.
A schedule listing every reinforcement bar in a structure by mark, diameter, cut length, shape and quantity, used to order steel and guide site fixing. Working out the total weight of steel this represents is normally the next step. Total the steel with our rebar weight calculator.
The angle or ratio (horizontal:vertical) at which an excavation's sides slope back from vertical, used instead of a vertical face to keep an unsupported cut stable — a batter of 1:1 is a 45° slope, 0 is a vertical, fully supported face. See how batter affects excavation volume with our trench volume calculator.
An itemised list of materials, labour and quantities required for a construction project, used for pricing and tendering. Related: AI quantity takeoffs.
A digital process for creating and managing information for a built asset across its lifecycle, using a 3D model enriched with data on geometry, materials, cost and scheduling.
A thin, low-strength layer of concrete placed over prepared ground before the main structural pour, giving a clean, level working surface and stopping the main mix losing water into the subgrade beneath it. A blinding layer is usually a lean mix — work one out with our concrete mix ratio calculator.
A record of the soil and rock strata encountered during a ground investigation, including depths, descriptions and test results, used to assess subsurface conditions. See how Civils.ai extracts borehole logs into structured data.
The percentage increase in a soil or rock's volume when it is excavated and loosened, compared to its original bank measure — loose material takes up more space than the same mass did undisturbed in the ground. Convert a bank volume with our soil bulking & swell factor calculator.
A formally agreed amendment to the scope, cost or schedule of a construction contract after work has commenced. See how Civils.ai checks change orders automatically.
The process of identifying where building elements — structural, mechanical, electrical — physically collide within a coordinated model.
The process of converting a 3D point cloud, captured by laser scanning or photogrammetry, into a structured BIM model.
The volume of a soil or fill material after it has been placed and mechanically compacted, which is usually denser — and so smaller in volume — than the same material measured loose or even in its original bank state. Work out compacted volume with our soil bulking & swell factor calculator.
A field of AI that enables software to interpret and extract information from images or video, such as recognising symbols and dimensions on a scanned construction drawing. Related: Civils.ai's document digitiser.
An assessment of a design's practicality to build, checking for sequencing, access and coordination issues before construction begins.
The surface area of formwork that is in direct contact with wet concrete during a pour, used to size the panels, ties and bracing needed — distinct from the volume of concrete the formwork actually contains. Calculate it with our formwork area calculator.
A scheduling technique that identifies the longest sequence of dependent tasks in a project, determining the minimum possible project duration.
An earthworks calculation comparing existing and proposed ground levels to determine how much material must be excavated (cut) or imported (fill) to achieve a design grade. See how Civils.ai handles earthworks & subsurface takeoffs. Or work one out directly with our free cut and fill calculator.
A traditional project delivery method where design is completed first, then contractors bid on the fixed design, followed by construction.
A concrete mix proportioned by a lab or engineer to achieve a specified strength and durability from the properties of its actual materials, as opposed to a nominal mix's fixed, generic ratio. Compare it against a nominal mix with our concrete mix ratio calculator.
The use of digital tools, data and automation — BIM, drones, AI — to plan, design and deliver construction projects.
A live, data-connected digital replica of a physical asset — a building, tunnel, or site — that updates as the real-world asset changes, used for monitoring, simulation and predictive maintenance.
Construction activities involving the moving, shaping or stabilising of ground, including excavation, grading, cut and fill, and compaction. See how Civils.ai measures earthworks quantities from PDF drawings. Or try our free earthworks calculators.
A drawing showing existing and proposed ground levels across a site, used to plan drainage, earthworks and finished surface levels. See how Civils.ai reads earthworks quantities from grading plans. Or model one directly with our grid-based cut and fill calculator.
A construction professional responsible for calculating the likely cost of a project, based on quantities, labour rates and material prices. Civils.ai builds AI takeoff software for subcontractors and estimators. Or use our free estimating calculators.
A detailed drawing used by a manufacturer or subcontractor to produce a specific building component off-site, such as steelwork or ductwork.
The temporary structure — props, bearers, staging — that supports formwork and wet concrete until a pour has gained enough strength to be self-supporting, distinct from formwork's own contact surface with the concrete. Size the panels falsework supports with our formwork area calculator.
The finished level of the ground after cut, fill or excavation, onto which a foundation, sub-base or pavement is built — the datum an earthworks cut/fill calculation works towards. Work cut/fill to a formation level with our advanced cut and fill calculator.
The temporary mould, usually timber or steel panels, that holds wet concrete in shape until it has cured enough to be self-supporting. Sized by its contact area — the surface touching the concrete — rather than the volume of concrete it contains. Calculate contact area with our formwork area calculator.
AI models that create new content — text, images, designs — based on patterns learned from training data, rather than simply classifying or retrieving existing information.
The branch of civil engineering concerned with the behaviour of soil and rock, underpinning the design of foundations, retaining walls, slopes and tunnels. Related: earthworks & subsurface takeoffs.
Software used to capture, store, analyse and display spatial and geographic data, commonly used in site selection, infrastructure planning and environmental assessment.
An earthworks estimating method that overlays a site with a uniform grid of equal-area cells, comparing existing and proposed level at each cell to calculate cut or fill volume — more detailed than a hand-picked zone method where the ground is uneven. Try it with our advanced cut and fill calculator.
The total time a truck takes to complete one round trip on a haulage job — loading, hauling, tipping and returning — used with a working day length to work out how many loads a truck can move per day. Plan a haulage job with our truck load & haulage calculator.
An open, vendor-neutral file format for exchanging BIM data between different software applications.
The length over which two reinforcement bars are overlapped so tension can transfer between them, since individual bars are only supplied in finite stock lengths — adds extra bar length beyond a structure's raw geometric requirement. Include a lap allowance with our rebar weight calculator.
An AI model trained on vast amounts of text to understand and generate human language — the technology underlying tools like ChatGPT and AI-powered document search. Civils.ai uses this technology to power AI search across building codes.
A remote-sensing method that measures distance by timing a reflected laser pulse, used to generate point clouds for surveying, earthworks and topographic mapping.
The volume of an excavated soil or rock material once it has been dug and loaded, after bulking has increased it beyond its original bank measure. Truck capacity and haulage counts are worked out on loose, not bank, volume. Work loads out from a loose volume with our truck load & haulage calculator.
A subset of AI in which systems learn patterns from data and improve their performance on a task without being explicitly programmed for every scenario.
A cumulative plot of cut and fill volume along a route or site, used to plan the most efficient sequence and direction for moving excavated material rather than importing or exporting it unnecessarily. Size the haulage this implies with our truck load & haulage calculator.
The building services disciplines covering heating, ventilation, air conditioning, electrical power, lighting and plumbing systems. MEP is one of Civils.ai's supported takeoff trades.
A method of building in which sections or entire units are manufactured off-site in a factory, then transported and assembled on site.
The removal of surplus excavated soil or spoil from a site by truck, typically because a project generates more cut material than it needs for fill. Volume and truck-load count are usually the first questions on a groundworks tender. Work out loads for a muck-away job with our truck load & haulage calculator.
A machine learning model loosely inspired by the structure of the brain, made up of layers of interconnected nodes, used for tasks such as image recognition and language processing.
A concrete mix proportioned by a fixed, standard ratio of cement, sand and aggregate by volume — such as 1:2:4 — rather than a lab-designed mix tailored to a specific strength, commonly used for non-structural or lower-strength concrete. Split a volume out with our concrete mix ratio calculator.
Technology that converts scanned or photographed text — a PDF drawing title block, a scanned specification — into machine-readable, searchable text. Related: Civils.ai's document digitiser.
The technique of capturing 3D measurements and models from overlapping photographs, commonly used for site surveys and progress monitoring.
A large set of 3D coordinate points captured by a laser scanner or photogrammetry, representing the surface of a physical space or object, commonly used to document as-built conditions.
The use of historical data, statistics and machine learning to forecast future outcomes, such as project delays, cost overruns or equipment failure.
The practice of crafting inputs to an AI model, particularly a large language model, to reliably produce accurate and useful outputs.
A list of minor defects or outstanding items identified near the end of a project that must be resolved before final handover.
The process of measuring and counting materials, areas, lengths and elevations from construction drawings to price and plan a project. See how Civils.ai automates quantity takeoffs from PDF drawings. Or try our free construction estimating calculators.
The process of recording the physical state of a site or asset using tools such as laser scanning, photogrammetry or drones, to create an accurate digital record.
Steel bars embedded in concrete to carry the tensile loads concrete alone can't resist. Ordered and costed by weight, calculated from each bar's diameter, cut length and quantity. Calculate it with our rebar weight calculator.
A structure designed to hold back soil or rock at a slope steeper than it would naturally maintain, commonly used in earthworks, roads and foundations.
An AI technique that combines a large language model with a search step over a specific set of documents, so answers are grounded in relevant source material rather than the model's general training data alone. This is the technique behind Civils.ai's AI search across building codes.
A formal written query raised by a contractor or design team to clarify ambiguous, missing or conflicting information in project drawings or specifications. See specs & contract checking.
A document defining the specific tasks, deliverables and boundaries of work to be performed under a contract. See how Civils.ai turns a plain-English scope into a takeoff.
A layer of material, usually a sand-cement mix, laid over a structural concrete slab to provide a smooth, level surface for a floor finish — placed as a separate layer and stage from the slab beneath it. Work out the volume with our slab & screed volume calculator.
A detailed drawing prepared by a contractor, supplier or fabricator showing how a specific element will be manufactured and installed.
The percentage reduction in a soil's volume when it is compacted into fill, compared to its original bank measure — compacted fill usually settles denser than the undisturbed ground it came from, the inverse of a bulking factor. Apply one with our soil bulking & swell factor calculator.
A programme of ground exploration — boreholes, trial pits, laboratory testing — carried out to assess ground conditions before design and construction. See how Civils.ai extracts geotechnical report data.
The resistance of a natural or engineered slope to sliding or collapse, assessed through geotechnical analysis of soil strength, geometry and water conditions.
A system for categorising soil types — clay, sand, silt, gravel — based on grain size and properties, used to inform geotechnical design. Bulking factors vary by soil type — see our soil bulking & swell factor calculator.
The written document accompanying drawings that defines required materials, workmanship and quality standards for a project, often cross-checked against contract terms and codes of practice. See specs & contract checking.
A temporary pile of excavated or delivered material — commonly topsoil, aggregate or spoil — stored on or near a site until it's needed or removed, usually shaped as a simple cone sized from its material's angle of repose. Size one with our topsoil strip & stockpile volume calculator.
A drawing showing the load-bearing elements of a building or structure — foundations, beams, columns, slabs — and how they are sized and connected.
The natural or prepared ground surface that lies beneath a road, foundation or pavement structure, providing the base for construction above it. Size the excavation above it with our trench volume calculator.
Documentation — product data, samples, shop drawings — submitted by a contractor for review and approval before materials are procured or installed. See specs & contract checking.
Software used to measure quantities — areas, lengths, counts — directly from digital construction drawings, replacing manual measurement with a scale ruler. Compare Civils.ai against other takeoff software.
A survey recording the existing natural and built features of a site, including ground levels, vegetation and structures, used as a baseline for design. Turn survey levels into volumes with our grid-based cut and fill calculator.
The removal of the uppermost layer of organic, vegetated soil from a site before earthworks begin, so it can be stockpiled and reused for landscaping rather than mixed into the structural fill. Calculate strip volume with our topsoil strip & stockpile volume calculator.
A large mechanised excavation machine used to bore tunnels through soil or rock with a circular cross-section, commonly used for transport, utility and mining tunnels.
The price for one unit of measured work — per cubic metre, per square metre, per tonne — built up from the labour, plant, material and overhead cost of producing it, the basic building block of a construction estimate. See our free construction estimating calculators.
A structured review process aimed at achieving a project's required function at the lowest overall cost, without compromising quality or performance.
A documented instruction that changes the scope, cost or programme of a construction contract, formalising work that differs from the original agreement. See how Civils.ai checks change and variation orders.
An extra percentage added to a calculated material quantity to cover spillage, over-ordering tolerance and on-site losses, so the amount ordered reliably covers what's actually needed on site. Add one to a pour quantity with our concrete volume calculator.
Extra excavation width added beyond a pipe or structure's own footprint, to give workers physical room to lay, joint and backfill it safely — typically a fixed distance added to each side of a trench's base width. See it applied in our trench volume calculator.
Put these terms to work with our free construction calculators.
See free estimating tools