Tamil Nadu HSE First Year Basic Civil Engineering cheat sheet

Civil engineering branches: structural, geotechnical, water resources, transportation, environmental, surveying, construction management.

Stones: igneous (granite, basalt) are hard and durable; sedimentary (sandstone, limestone) are softer; metamorphic (marble, slate) are recrystallised.

Bricks classification: first class burnt clay bricks absorb under 20% water, give a clear ringing sound and are used for permanent masonry.

Cement types: OPC 33, 43, 53 grades; PPC blends fly ash; rapid hardening cement gains early strength for urgent works.

Timber defects: knots, shakes, warping, and decay; seasoned timber has reduced moisture and better strength.

Steel: mild steel is ductile and used for reinforcement; HYSD bars have higher yield strength than mild steel bars.

Lime: fat lime slakes readily and is used for whitewashing; hydraulic lime sets under water.

Scale: Representative Fraction = map distance / ground distance; 1 cm = 10 m gives RF 1:1000.

Chain surveying suits small, fairly level areas with simple details; triangulation is used for large areas.

Ranging: direct ranging by eye for short lines; reciprocal ranging when ends are not intervisible.

Levelling: Height of Instrument method and Rise and Fall method both compute reduced levels from staff readings.

Arithmetic check: sum of backsights minus sum of foresights equals last reduced level minus first reduced level.

Contouring: contour lines never cross; closely spaced contours indicate steep slopes.

Theodolite measures horizontal and vertical angles; total station adds distance and data storage.

Mortar mixes: 1:3 cement mortar for load-bearing masonry; 1:6 for general plastering.

Bearing capacity of soil decides footing type; isolated footings for columns, raft for weak soils.

Damp-proof course (DPC) is laid at plinth level using bitumen or cement concrete to stop capillary rise.

Brick masonry bonds: English bond alternates headers and stretchers; Flemish bond alternates header and stretcher in each course.

Lintels span openings and carry wall load above; sunshades project outside windows.

Plaster protects masonry and gives a finished surface; pointing fills joints without covering the surface.

Concrete floors: base course of rubble, then lean concrete, then finished topping.

Principles of planning: aspect, prospect, privacy, circulation, roominess, sanitation, and economy.

Minimum room sizes: 3.0 m x 3.6 m for living room; kitchen about 2.4 m x 3.0 m; bedroom 3.0 m x 3.6 m.

Setback is the open space between the building line and the plot boundary; FAR = total floor area / plot area.

Orientation: longer walls face north-south to reduce heat gain in hot climates.

Scale drawing: plan shows top view; section shows vertical cut; elevation shows the front view.

Line types: continuous thick for visible outlines, dashed for hidden lines, chain line for centre lines.

Staircase: rise 150-190 mm, tread 250-300 mm, headroom at least 2.1 m.

Stress = load / area; strain = change in length / original length; Young's modulus E = stress / strain.

Hooke's law applies within the elastic limit; proportional limit marks the end of linear stress-strain behaviour.

Poisson's ratio = lateral strain / longitudinal strain; typical value for steel is about 0.3.

Bending equation: M / I = sigma / y = E / R, where M is bending moment, I is moment of inertia, y is distance from neutral axis.

Shear force diagram: shear force is zero where bending moment is maximum.

Simply supported beam with central point load W and span L: maximum BM = WL/4.

Cantilever with point load W at free end: maximum BM at fixed end = W x L.

Nominal mixes: M15 = 1:2:4, M20 = 1:1.5:3, M25 = 1:1:2 (cement:sand:aggregate).

Water-cement ratio controls strength and workability; lower w/c raises strength up to a practical limit.

Slump test measures workability of fresh concrete; compaction factor test is used for low-slump mixes.

Curing keeps concrete moist; minimum 7 days for OPC, 10-14 days for blended cements.

Cube test at 28 days gives characteristic compressive strength; M20 means 20 N/mm2 at 28 days.

Aggregates: fine aggregate passes 4.75 mm sieve; coarse aggregate is retained on it.

Segregation is separation of aggregates from mortar; bleeding is water rising to the surface.

Per capita water demand in Indian towns is about 135 litres per head per day for domestic use.

Sources: surface water (rivers, lakes) and groundwater (wells, tube wells); groundwater is usually clearer.

Sedimentation, filtration, and disinfection form the standard treatment train; chlorine is the common disinfectant.

Residual chlorine of about 0.2 mg/l should remain after treatment to protect the distribution system.

Sanitary sewer carries sewage; storm sewer carries rainwater; separate systems avoid overloading treatment works.

Self-cleansing velocity in sewers is about 0.6-0.9 m/s; minimum gradient keeps flow moving.

Septic tank is a simple on-site treatment unit for individual houses; soak pit disposes of effluent.

Road classification: national highways, state highways, major district roads, other district roads, village roads.

Camber is the cross slope that drains rainwater; typical value 2-3% for bituminous surfaces.

Superelevation counters centrifugal force on curves; maximum value about 7% for plain terrain.

Stopping sight distance = lag distance + braking distance; depends on speed, reaction time, and friction.

Bitumen is a flexible pavement binder; cement concrete gives rigid pavement with slab action.

CBR (California Bearing Ratio) value is used to design flexible pavement thickness.

Transition curve is provided between straight and circular curve to introduce superelevation gradually.

Civil engineering is the oldest branch and deals with infrastructure such as buildings, roads, bridges, dams, and water systems.

Bricks are made from clay, moulded and burnt; good bricks are uniform in shape and free from cracks.

Stones used in construction include granite, sandstone, limestone, and marble; each has different strength and durability.

Cement is a binding material; when mixed with water it sets and hardens, holding aggregates together.

Steel reinforcement resists tension in concrete because concrete is weak in tension.

Timber must be seasoned to reduce moisture before use in doors, windows, and furniture.

Lime, sand, and cement are the main ingredients of mortar used for masonry and plastering.

Surveying determines relative positions of points on the earth's surface; levelling determines relative heights.

Chain, tape, compass, theodolite, and total station are common surveying instruments.

Plane table surveying is graphical and suits small-scale mapping in the field.

Benchmark is a fixed reference point of known reduced level used for levelling work.

Backsight is the first staff reading after setting the instrument; foresight is the last reading.

Contour interval is the vertical distance between successive contour lines; it stays constant on one map.

Errors in surveying: instrumental, personal, and natural errors such as refraction and temperature.

Building components: foundation, plinth, wall, column, beam, slab, lintel, roof, and floor.

Foundation transfers building load to the soil; shallow foundations include spread footings and rafts.

Piles are deep foundations used when soil at shallow depth is weak.

Brick masonry walls carry load; reinforced concrete columns and beams carry loads in framed structures.

Cement plaster is applied in layers, usually 12-20 mm thick on walls.

Roofs may be flat (RCC slab) or pitched (sloping with tiles or sheets).

Doors and windows need lintels above openings to support the wall load.

Building drawing includes plan, elevation, section, and site plan, drawn to a suitable scale.

Plan is a horizontal section cut at about 1.2 m above floor level, showing walls, doors, and windows.

Elevation shows the external appearance of the building from one side.

Section shows internal details such as foundation depth, floor levels, and roof height.

Scale 1:100 is common for building plans; 1:1000 or smaller is used for site plans.

Ventilation and lighting depend on the number and size of windows in each room.

Building bye-laws fix minimum setbacks, room sizes, and heights for safety and comfort.

A structure must be safe, stable, and serviceable under the loads acting on it.

Loads on structures include dead load (self-weight), live load (occupants), and wind or seismic loads.

Tension stretches a member; compression shortens it; shear causes sliding of one part over another.

Bending moment causes bending in beams; shear force causes shearing along the section.

A simply supported beam rests on two supports; a cantilever is fixed at one end and free at the other.

Stress is internal resistance per unit area; strain is deformation per unit length.

Factor of safety = ultimate strength / working stress; it accounts for uncertainties in design.

Concrete is a mixture of cement, fine aggregate, coarse aggregate, and water.

Cement paste coats aggregates and binds them into a solid mass after setting.

Grades of concrete such as M15, M20, and M25 denote characteristic strength in N/mm2.

Workability of concrete is measured by slump, compaction factor, or vee-bee tests.

Curing is essential for strength development; it keeps the concrete moist after placing.

Concrete has high compressive strength but low tensile strength, so steel is added for reinforcement.

Too much water reduces strength; too little water makes the mix unworkable.

Water supply engineering covers sources, treatment, storage, and distribution of potable water.

Sanitary engineering deals with collection, treatment, and disposal of sewage and waste.

Water demand depends on population, climate, and habits; domestic demand is a major share.

Water treatment steps include screening, sedimentation, filtration, and disinfection.

Pipes for water distribution are made of cast iron, steel, PVC, or HDPE.

Sewers carry sewage by gravity; manholes provide access for inspection and cleaning.

Environmental pollution includes water, air, and noise pollution, which affect public health.

Transportation modes include roads, railways, airways, and waterways; roads give door-to-door service.

Highway alignment should be short, safe, and economical, with gentle curves and gradients.

Road cross-section includes carriageway, shoulders, kerbs, drains, and footpaths.

Pavements are flexible (bituminous) or rigid (cement concrete).

Bitumen is used as a binder in flexible pavements; it is heated and mixed with aggregates.

Traffic signs, markings, and signals control traffic and improve road safety.

Highway drainage removes surface and subsurface water to protect the pavement.

Civil engineering shapes infrastructure: buildings, roads, bridges, dams, water supply, and sanitation.

Materials used in construction include stone, brick, cement, steel, timber, and concrete.

Stone is durable and strong in compression; it is used for masonry and flooring.

Bricks are economical and good in compression; they are used for walls and partitions.

Cement is manufactured by burning limestone and clay in a kiln and grinding the clinker.

Steel is strong in tension and compression; it is used for reinforcement and structural frames.

Timber is light and easy to work; it is used for doors, windows, and roofing.

Surveying is the art and science of determining positions of points on the earth's surface.

Levelling measures differences in elevation between points using a level and staff.

Chain survey uses a chain or tape to measure distances along a framework of triangles.

Compass survey measures bearings of survey lines using a magnetic compass.

Theodolite survey measures horizontal and vertical angles precisely.

Total station combines electronic distance measurement with angle measurement and data storage.

Levelling instruments include dumpy level, tilting level, and auto level.

A building consists of substructure (below ground) and superstructure (above ground).

Substructure includes foundations, plinth, and basement if any.

Superstructure includes walls, columns, beams, slabs, roofs, doors, and windows.

Foundations are designed to distribute loads safely to the soil.

Walls may be load-bearing or non-load-bearing (partition) walls.

Beams carry loads from slabs and walls; columns carry loads from beams and slabs.

Slabs provide flat usable floors and roofs in buildings.

Building planning aims to provide functional, safe, and comfortable spaces.

Rooms should be placed to get good light, ventilation, and privacy.

The kitchen should be near the dining area and have proper ventilation.

Toilets should be located away from kitchens and living areas for hygiene.

Stairs should have safe rise and tread and adequate headroom.

Drawings use standard symbols for doors, windows, and sanitary fittings.

Dimensions on drawings are usually given in millimetres for building plans.

Mechanics of structures studies the effect of forces on structural members.

Strength of materials deals with stress, strain, and deformation of materials under load.

Elasticity is the property by which a material returns to its original shape after unloading.

Plasticity is permanent deformation after the load is removed.

Ductility allows a material to be drawn into wires; steel is ductile.

Brittleness causes sudden failure without much deformation; cast iron is brittle.

Hardness resists indentation or scratching on the material surface.

Concrete technology deals with the properties and production of concrete.

The main ingredients of concrete are cement, fine aggregate, coarse aggregate, and water.

Admixtures are added to improve workability, setting time, or durability.

Batching is measuring ingredients by volume or weight before mixing.

Mixing may be done by hand or in a machine mixer for uniform concrete.

Placing and compaction remove air voids and make concrete dense.

Testing of concrete includes slump, cube compressive strength, and durability tests.

Water supply engineering provides safe and adequate water to communities.

Sanitary engineering provides safe disposal of sewage and solid waste.

Sources of water include rivers, lakes, wells, and tube wells.

Water quality is checked for physical, chemical, and bacteriological parameters.

Sedimentation removes suspended particles by allowing water to stand.

Filtration removes finer particles and some bacteria from water.

Disinfection kills harmful bacteria and makes water safe for drinking.

Transportation engineering deals with planning, design, and operation of transport systems.

Highway engineering covers road surveys, design, construction, and maintenance.

Roads are classified as national highways, state highways, district roads, and village roads.

Road alignment should avoid sharp curves, steep gradients, and flood-prone areas.

Pavement design depends on traffic load and soil strength.

Highway construction includes earthwork, subgrade, base course, and surfacing.

Road maintenance keeps the pavement in good condition and prevents accidents.

Civil engineers plan, design, construct, and maintain infrastructure for society.

Infrastructure includes buildings, roads, bridges, dams, airports, and water systems.

The main branches are structural, geotechnical, water resources, transportation, and environmental engineering.

Engineering materials must have strength, durability, and economy for construction.

Stone, brick, cement, steel, and concrete are common construction materials.

Selection of material depends on strength, availability, cost, and durability.

Testing of materials ensures quality and safety in construction.

Surveying is important for planning and layout of civil engineering works.

Levelling is used to set out foundations, roads, and drainage at correct levels.

A benchmark is a fixed reference with a known reduced level.

Reduced level is the height of a point above a chosen datum.

The level instrument is set up and levelled before taking staff readings.

Staff readings are taken on a graduated staff held vertically on the point.

Surveying errors must be checked and corrected for accurate results.

Construction involves assembling materials into a safe and functional building.

Bricks, stones, cement, sand, steel, and timber are the main materials.

Mortar is used to bind bricks or stones in masonry.

Concrete is used in foundations, columns, beams, slabs, and roofs.

Steel reinforcement is placed in concrete to resist tensile forces.

Timber is used in doors, windows, cupboards, and roofing.

Construction must follow drawings, specifications, and safety practices.

Building planning considers function, comfort, safety, and economy.

Orientation of rooms affects sunlight and ventilation.

Aspect refers to the arrangement of rooms to get good light and air.

Prospect refers to the view from the entrance of the building.

Privacy is achieved by proper arrangement of rooms and doors.

Circulation is the movement space between rooms and along corridors.

Building drawings communicate the design to the construction team.

Structures must resist loads without failure or excessive deformation.

Dead load is the self-weight of the structure and its permanent parts.

Live load is the movable load such as people, furniture, or vehicles.

Wind and earthquake loads are lateral loads acting on structures.

Stress is force per unit area and is measured in N/mm2.

Strain is deformation per unit length and is dimensionless.

Design ensures that stress in members stays within safe limits.

Concrete is the most widely used construction material.

Its main ingredients are cement, sand, coarse aggregate, and water.

Cement acts as the binding material in concrete.

Sand fills voids and improves workability of the mix.

Coarse aggregate provides the main body and strength to concrete.

Water is needed for chemical reaction and workability.

Proper proportioning of ingredients gives strong and durable concrete.

Water supply systems include intake, treatment, storage, and distribution.

Pipes carry water from the source to the treatment plant and then to homes.

Storage tanks balance the supply and demand of water through the day.

Sewage is the wastewater from homes, industries, and public places.

Sewer pipes carry sewage to treatment plants or disposal points.

Manholes are provided at intervals for cleaning and inspection of sewers.

Environmental engineering protects public health and the environment.

Transportation is essential for economic and social development.

Roads provide flexible door-to-door transport for people and goods.

Highway surveys collect data for planning the road alignment.

Roads are designed for safe travel at the design speed.

Camber drains rainwater from the road surface.

Kerbs and footpaths separate pedestrians from vehicles.

Road signs and markings guide drivers and improve safety.

Civil engineering is one of the oldest engineering disciplines.

It deals with the built environment and public infrastructure.

Branches include structural, geotechnical, water resources, transportation, and environmental engineering.

Engineering materials are selected based on strength, durability, and cost.

Common materials are stone, brick, cement, steel, timber, and concrete.

Material testing ensures safety and quality in construction.

Civil engineers serve society by providing safe and economical infrastructure.

Surveying determines the relative positions of points on the earth's surface.

Levelling determines the relative heights of points.

Surveying is done before planning and layout of any civil engineering work.

Instruments include chain, tape, compass, level, theodolite, and total station.

Reduced level is the elevation of a point above a chosen datum.

Benchmark is a fixed reference point of known elevation.

Accuracy of surveying affects the quality of construction.

Buildings are made of materials such as brick, stone, cement, steel, and timber.

Foundations transfer building loads to the soil safely.

Walls enclose spaces and may be load-bearing or partition walls.

Beams and columns form the framed structure of buildings.

Slabs provide floors and roofs.

Doors and windows provide access, light, and ventilation.

Construction must follow drawings, specifications, and safety norms.

Building planning is done to provide functional and comfortable spaces.

Rooms should get good light and ventilation for health and comfort.

Kitchen and toilet locations should be planned for hygiene.

Staircase design should be safe and easy to use.

Drawings include plan, elevation, section, and site plan.

Standard symbols are used for doors, windows, and fittings.

Building bye-laws guide planning and construction.

Mechanics of structures studies the effect of loads on structures.

Strength of materials studies stress, strain, and deformation.

Stress is force per unit area and strain is deformation per unit length.

Elasticity, plasticity, ductility, and brittleness are material properties.

Beams carry loads and resist bending.

Columns carry axial compressive loads.

Safe design keeps stresses within permissible limits.

Concrete is a mixture of cement, sand, coarse aggregate, and water.

Cement binds the aggregates into a solid mass.

Water-cement ratio affects the strength of concrete.

Workability is measured by slump and compaction factor tests.

Curing keeps concrete moist for strength development.

Concrete is strong in compression but weak in tension.

Steel reinforcement is used in concrete to resist tension.

Water supply engineering provides safe drinking water to communities.

Sources of water include rivers, lakes, wells, and tube wells.

Treatment includes sedimentation, filtration, and disinfection.

Distribution pipes carry water to consumers.

Sanitary engineering deals with sewage collection and disposal.

Sewers carry sewage to treatment plants.

Environmental engineering protects public health and the environment.

Transportation engineering deals with the movement of people and goods.

Roads provide flexible door-to-door transport.

Highway engineering covers road survey, design, construction, and maintenance.

Roads are classified as national, state, district, and village roads.

Camber drains rainwater from the road surface.

Pavements are flexible (bituminous) or rigid (cement concrete).

Road safety depends on good design, signs, and maintenance.

Civil engineering deals with the design and construction of infrastructure.

It includes buildings, roads, bridges, dams, and water systems.

The main branches are structural, geotechnical, water resources, transportation, and environmental engineering.

Engineering materials must be strong, durable, and economical.

Stone, brick, cement, steel, timber, and concrete are common materials.

Material selection depends on strength, availability, and cost.

Testing of materials ensures safety and quality.

Surveying determines the positions of points on the earth's surface.

Levelling determines the differences in elevation between points.

Surveying is essential for planning and layout of civil works.

Instruments include chain, tape, compass, level, theodolite, and total station.

Reduced level is the height of a point above a datum.

Benchmark is a fixed point of known elevation.

Accurate surveying is the basis of good construction.

Buildings are constructed using brick, stone, cement, steel, and timber.

Foundations transfer loads to the soil.

Walls enclose spaces and may be load-bearing or partition walls.

Beams and columns form the structural frame.

Slabs provide floors and roofs.

Doors and windows provide access, light, and ventilation.

Construction must follow drawings and safety norms.

Building planning provides functional and comfortable spaces.

Rooms should have good light and ventilation.

Kitchen and toilet locations should be planned for hygiene.

Staircases should be safe and easy to use.

Drawings include plan, elevation, section, and site plan.

Standard symbols are used for doors, windows, and fittings.

Building bye-laws guide planning and construction.

Mechanics of structures studies the effect of loads on structures.

Strength of materials studies stress, strain, and deformation.

Stress is force per unit area; strain is deformation per unit length.

Elasticity, plasticity, ductility, and brittleness are material properties.

Beams resist bending; columns carry axial loads.

Safe design keeps stresses within permissible limits.

Factor of safety accounts for uncertainties in design.

Concrete is a mixture of cement, sand, coarse aggregate, and water.

Cement binds the aggregates into a solid mass.

Water-cement ratio affects the strength of concrete.

Workability is measured by slump and compaction factor tests.

Curing keeps concrete moist for strength development.

Concrete is strong in compression but weak in tension.

Steel reinforcement is used in concrete to resist tension.

Water supply engineering provides safe drinking water to communities.

Sources of water include rivers, lakes, wells, and tube wells.

Treatment includes sedimentation, filtration, and disinfection.

Distribution pipes carry water to consumers.

Sanitary engineering deals with sewage collection and disposal.

Sewers carry sewage to treatment plants.

Environmental engineering protects public health and the environment.

Transportation engineering deals with the movement of people and goods.

Roads provide flexible door-to-door transport.

Highway engineering covers road survey, design, construction, and maintenance.

Roads are classified as national, state, district, and village roads.

Camber drains rainwater from the road surface.

Pavements are flexible (bituminous) or rigid (cement concrete).

Road safety depends on good design, signs, and maintenance.