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Concrete

Concrete: Concrete is a composite material composed of water, coarse granular material (the fine and coarse aggregate or filler) embedded in a hard matrix of material (the cement or binder) that fills the space among the aggregate particles and glues them together.Rdcconcrete concrete

 

Grading of concrete  with the ratio of cement sand and broken stone.

Grade of concrete Crushing or characteristic strength at 28 days
M10=1:3:6  100 kg/cm2=10 N/mm2
M15=1:2:4 150 kg/cm2=15 N/mm2
M20=1:1.5:3 200 kg/cm2=20 N/mm2
M25=1:1:2 250 kg/cm2=25 N/mm2

2014-Cost of concrete work labour charge in India Kerala

Sl No Item of work Unit Labour charge Unit Labour charge
1a Slab up to 10 cm thick m2 RS 538.00 ft2 RS 50.00
1b Slab above 10 cm thick m3 Rs.5300.00 ft3 Rs.150.00
2  P.c.c-FLOOR  m2  RS 215  F2  RS 20.00
3  Footing  m3  RS 4700.00  Qft  RS 133.00
4  Concrete wall (10 cm)  m2  RS 592.00  Sqft  RS 55.00
5  Rack.Plain Sunshade  m2  RS 538.00 Sqft  RS 50.00
6  Sunshade Slope  m2  RS 650.00  Sqft  RS 60.00
7  Board  work  m2  RS 592.00   Sqft  RS 55.00
8  Hanging(drop board)   Board (30 cm)  Rm  RS 180.00  Sqft  RS 55.00
9  Slope Slab 2 side up to 40 degree  m2  RS 710.00  Sqft  RS 66.00
10  Slope Slab 2 side 40 to 50 slope  m2  RS 770.00  Sqft  RS 72.00
11  Slope Slab 3,4 side slope  m2  RS 900.00  Sqft  RS 84.00
12  Pillar  R.Meter  RS 650.00  R.feet  RS 200.00
13  Pillar 30 cm to 50 cm  R.Meter  RS 853.00  R.feet  RS 260.00
14  Pillar round  20 cm to 30 cm R.meter Rs 853.00  R.fteet Rs.260.00
15  Cutting ordinary (Sunshade  Slab)  R.meter  RS 165.00  R. feet   RS 50.00
16  Cutting Round  R.meter  RS 412.00  R. feet  RS 125.00
17  Beam (20 X 30 CM)  R.meter  RS 600.00  R. feet  RS 180.00
18  Beam (30 x 60 cm)  R.meter RS 850.00  R. feet  RS 260.00
19 Beam arch (20 to 30 cm)  R.meter Rs.1000.00 R. feet  Rs.310.00
20   Beam Concealed 30 cm Steel Work  R.meter  RS 100.00  R. feet  RS 31.00
21  Beading (Curb )  R.meter  RS 132.00  R. feet  RS 40.00
22  Belt (15 x 30 cm)  R.meter  RS 250.00  R. feet  RS 76.00
23  Lintel  R.meter  RS 295.00  R. feet  RS 90.00
24  Step (ordinary) 1.00 m width  Per step  Rs.550.00  —-
25  Step (chain) 1.00 m width  Per step  Rs.800.00  —-
26  Step (design) 1.00 m width  Per step  Rs.1250.00  —-
 Commercial
1a Slab (10 cm thick)  m2  RS 592.00   Sqft  RS 55.00
1b Slab above 10 cm m3 Rs 5830 ft3 Rs 165.00
2  Footing  m3  RS 4700.00  Qft  RS 133.00
3  P.C.C  m3  RS 2472.00  Qft  RS 70.00
4 Pillar-20 x 40 cm  R.Meter RS 650.00  Rqft  RS 200.00
5 Pillar Round (upto 30 cm) R.Meter RS 820.00  Rqft  RS 250.00
6 Board Work m2 RS 710.00  Sqft  RS 66.00
7 Beam (  upto 20×30 cm)  R.meter RS 738.00 R. feet  RS 225.00
8 Stair (ordinary) 1.25 m width Per step RS 600.00  —
9 Stair (chain) 1.25 m width Per step RS 900.00  —
10 Stair (design) 1.25 m width Per step RS 1350.00  —

2012-Cost of concrete work labour charge in India Kerala

Sl No Item of work Unit Labour charge Unit Labour charge
1 Slab up to 10 cm thick m2 RS 431 ft2 RS 40.00
2  p.c.c  m3  RS 1590.00  Qft  RS 45.00
3  Footing  m3  RS 3532.00  Qft  RS 100.00
4  Concrete wall (10 cm)  m2  RS 528.00  Sqft  RS 50.00
5  Rack  m2  RS 484.00 Sqft  RS 45.00
6  Plain Sunshade  m2  RS 484.00  Sqft  RS 45.00
7  Sunshade Slope  m2  RS 592.00  Sqft  RS 55.00
8  Board  work  m2  RS 538.00   Sqft  RS 50.00
9  Han gin   Board (30 cm)  m2  RS 753.00  Sqft  RS 70.00
10  Slab 2 side 30 to 40 slope  m2  RS 645.00  Sqft  RS 60.00
11  Slab 2 side 40 to 50 slope  m2  RS 699.00  Sqft  RS 65.00
12  Slab 3,4 side slope  m2  RS 860.00  Sqft  RS 80.00
13  Pillar,Beam, Lintel  Sq.Meter  RS 540.00  Sqft  RS 50.00
14  Pillar Round  Sq.Meter  RS 970.00  Sqft  RS 90.00
15  Cutting Sunshade  Slab  R.meter  RS 148.00  R. feet   RS 45.00
16  Cutting Round  R.meter  RS 412.00  R. feet  RS 125.00
17  Beam (20 X 30 CM)  R.meter  RS 544.00  R. feet  RS 165.00
18  Beam Arch (20 x 30 cm)  R.meter RS 825.00  R. feet  RS 250.00
19   Beam Concealed 30 cm Steel Work  R.meter  RS 270.00  R. feet  RS 25.00
20  Beading (Curb )  R.meter  RS 132.00  R. feet  RS 40.00
21  Lintel (20 cm to 20 cm)  R.meter  RS 260.00  R. feet  RS 80.00
22  Belt (15 x 30 cm)  R.meter  RS 231.00  R. feet  RS 70.00
23  Step (ordinary) 1.00 m width  Per step  —–  —-  RS 500.00
24  Step (chain) 1.00 m width  Per step  —-  —-  RS 800.00
25  Step (design) 1.00 m width  Per step  —-  —-  RS 1200
1 Slab (10 cm thick)  m2  RS 538.00   Sqft  RS 50.00
2  Footing  m3  RS 3532.00  Qft  RS 100.00
3  P.C.C  m3  RS 2472.00  Qft  RS 70.00
4 Pillar Sq.Meter RS 540.00  Sqft  RS 50.00
5 Pillar Round Sq.Meter RS 1075.00  Sqft  RS 100.00
6 Board Work m2 RS 538.00  Sqft  RS 50.00
7 Beam (  upto 23×40 cm)  R.meter RS 495.00 R. feet  RS 150.00
8 Stair (ordinary) 1.00 m width Per step  —  RS 550.00
9 Stair (chain) 1.00 m width Per step  —  RS 900.00
10 Stair (design) 1.00 m width Per step  —  RS 1300.00
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Type Of Concrete

Mix design:Modern concrete mix designs can be complex. The choice of a concrete mix depends on the need of the project both in terms of strength and appearance and in relation to local legislation and building codes.The design begins by determining the requirements of the concrete. These requirements take into consideration the weather conditions that the concrete will be exposed to in service, and the required design strength. The compressive strength of a concrete is determined by taking standard molded, standard-cured cylinder samples.Many factors need to be taken into account, from the cost of the various additives and aggregates, to the trade offs between, the “slump” for easy mixing and placement and ultimate performance.A mix is then designed using cement (Portland or other cementitious material), coarse and fine aggregates, water and chemical admixtures. The method of mixing will also be specified, as well as conditions that it may be used in.This allows a user of the concrete to be confident that the structure will perform properly.Various types of concrete have been developed for specialist application and have become known by these names.Concrete mixes can also be designed using software programs. Such software provides the user an opportunity to select their preferred method of mix design and enter the material data to arrive at proper mix designs.

Old concrete recipes:Concrete has been used since ancient times. Regular Roman concrete for example was made from volcanic ash (pozzolana), and hydrated lime. Roman concrete was superior to other concrete recipes (for example, those consisting of only sand and lime)[used by other nations. Besides volcanic ash for making regular Roman concrete, brick dust can also be utilized. Besides regular Roman concrete, the Romans also invented hydraulic concrete, which they made from volcanic ash and clay.
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Modern concrete: Regular concrete is the lay term for concrete that is produced by following the mixing instructions that are commonly published on packets of cement, typically using sand or other common material as the aggregate, and often mixed in improvised containers. The ingredients in any particular mix depends on the nature of the application. Regular concrete can typically withstand a pressure from about 10 MPa (1450 psi) to 40 MPa (5800 psi), with lighter duty uses such as blinding concrete having a much lower MPa rating than structural concrete. Many types of pre-mixed concrete are available which include powdered cement mixed with an aggregate, needing only water.Typically, a batch of concrete can be made by using 1 part Portland cement, 2 parts dry sand, 3 parts dry stone, 1/2 part water. The parts are in terms of weight – not volume. For example, 1-cubic-foot (0.028 m3) of concrete would be made using 22 lb (10.0 kg) cement, 10 lb (4.5 kg) water, 41 lb (19 kg) dry sand, 70 lb (32 kg) dry stone (1/2" to 3/4" stone). This would make 1-cubic-foot (0.028 m3) of concrete and would weigh about 143 lb (65 kg). The sand should be mortar or brick sand (washed and filtered if possible) and the stone should be washed if possible. Organic materials (leaves, twigs, etc.) should be removed from the sand and stone to ensure the highest strength.

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High-strength concrete:High-strength concrete has a compressive strength greater than 40 MPa (5800 psi). In the UK, BS EN 206-1 defines High strength concrete as concrete with a compressive strength class higher than C50/60. High-strength concrete is made by lowering the water-cement (W/C) ratio to 0.35 or lower. Often silica fume is added to prevent the formation of free calcium hydroxide crystals in the cement matrix, which might reduce the strength at the cement-aggregate bond.Low W/C ratios and the use of silica fume make concrete mixes significantly less workable, which is particularly likely to be a problem in high-strength concrete applications where dense rebar cages are likely to be used. To compensate for the reduced workability, superplasticizers are commonly added to high-strength mixtures. Aggregate must be selected carefully for high-strength mixes, as weaker aggregates may not be strong enough to resist the loads imposed on the concrete and cause failure to start in the aggregate rather than in the matrix or at a void, as normally occurs in regular concrete.In some applications of high-strength concrete the design criterion is the elastic modulus rather than the ultimate compressive strength.
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Stamped concrete:Stamped concrete is an architectural concrete which has a superior surface finish. After a concrete floor has been laid, floor hardeners (can be pigmented) are impregnated on the surface and a mold which may be textured to replicate a stone / brick or even wood is stamped on to give an attractive textured surface finish. After sufficient hardening the surface is cleaned and generally sealed to give a protection. The wear resistance of stamped concrete is generally excellent and hence found in applications like parking lots, pavements, walkways etc.
High-performance concrete:High-performance concrete (HPC) is a relatively new term for concrete that conforms to a set of standards above those of the most common applications, but not limited to strength. While all high-strength concrete is also high-performance, not all high-performance concrete is high-strength. Some examples of such standards currently used in relation to HPC are:Ease of placement,Compaction without segregation,Early age strength,Long-term mechanical properties,Permeability,Density,Heat of hydration,Toughness,Volume stability,Long life in severe environments,Depending on its implementation, environmental,
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Ultra-high-performance concrete:Ultra-high-performance concrete is a new type of concrete that is being developed by agencies concerned with infrastructure protection. UHPC is characterized by being a steel fibre-reinforced cement composite material with compressive strengths in excess of 150 MPa, up to and possibly exceeding 250 MPa.[4] UHPC is also characterized by its constituent material make-up: typically fine-grained sand, silica fume, small steel fibers, and special blends of high-strength Portland cement. Note that there is no large aggregate. The current types in production (Ductal, Taktl, etc.) differ from normal concrete in compression by their strain hardening, followed by sudden brittle failure. Ongoing research into UHPC failure via tensile and shear failure is being conducted by multiple government agencies and universities around the world.
Cement Durcrete
Micro-reinforced ultra-high-performance concrete:Micro-reinforced ultra-high-performance concrete is the next generation of UHPC. In addition to high compressive strength, durability and abrasion resistance of UHPC, micro-reinforced UHPC is characterized by extreme ductility, energy absorption and resistance to chemicals, water and temperature. The continuous, multi-layered, three dimensional micro-steel mesh exceeds UHPC in durability, ductility and strength. The performance of the discontinuous and scattered fibers in UHPC is relatively unpredictable. Micro-reinforced UHPC is used in blast, ballistic and earthquake resistant construction, structural and architectural overlays, and complex facades.Ducon was the early developer of micro-reinforced UHPC, which has been used in the construction of new World Trade Center in New York.
Self-consolidating concrete:The defects in concrete in Japan were found to be mainly due to high water-cement ratio to increase workability. Poor compaction occurred mostly because of the need for speedy construction in the 1960s and 1970s. Hajime Okamura envisioned the need for concrete which is highly workable and does not rely on the mechanical force for compaction. During the 1980s, Okamura and his Ph.D. student Kazamasa Ozawa at the University of Tokyo developed self-compacting concrete (SCC) which was cohesive, but flowable and took the shape of the formwork without use of any mechanical compaction. SCC is known as self-consolidating concrete in the United States.
SCC is characterized by the following:

  • extreme fluidity as measured by flow, typically between 650–750 mm on a flow table, rather than slump (height)no need for vibrators to compact the concrete,easier placement,no bleeding, or aggregate segregation,increased liquid head pressure, which can be detrimental to safety and workmanship,

SCC can save up to 50% in labor costs due to 80% faster pouring and reduced wear and tear on formwork.In 2005, self-consolidating concretes accounted for 10–15% of concrete sales in some European countries. In the precast concrete industry in the U.S., SCC represents over 75% of concrete production. 38 departments of transportation in the US accept the use of SCC for road and bridge projects.This emerging technology is made possible by the use of polycarboxylates plasticizer instead of older naphthalene-based polymers, and viscosity modifiers to address aggregate segregation.

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Vacuum concrete:Vacuum concrete, made by using steam to produce a vacuum inside a concrete mixing truck to release air bubbles inside the concrete, is being researched. The idea is that the steam displaces the air normally over the concrete. When the steam condenses into water it will create a low pressure over the concrete that will pull air from the concrete. This will make the concrete stronger due to there being less air in the mixture. A drawback is that the mixing has to be done in a mostly airtight container.
Shotcrete:Shotcrete (also known by the trade name Gunite) uses compressed air to shoot concrete onto (or into) a frame or structure. The greatest advantage of the process is that shotcrete can be applied overhead or on vertical surfaces without formwork. It is often used for concrete repairs or placement on bridges, dams, pools, and on other applications where forming is costly or material handling and installation is difficult. Shotcrete is frequently used against vertical soil or rock surfaces, as it eliminates the need for formwork. It is sometimes used for rock support, especially in tunneling. Shotcrete is also used for applications where seepage is an issue to limit the amount of water entering a construction site due to a high water table or other subterranean sources. This type of concrete is often used as a quick fix for weathering for loose soil types in construction zones.

There are two application methods for shotcrete.

  • dry-mix – the dry mixture of cement and aggregates is filled into the machine and conveyed with compressed air through the hoses. The water needed for the hydration is added at the nozzle.
  • wet-mix – the mixes are prepared with all necessary water for hydration. The mixes are pumped through the hoses. At the nozzle compressed air is added for spraying.

For both methods additives such as accelerators and fiber reinforcement may be used

Limecrete:Limecrete or lime concrete is concrete where cement is replaced by lime. One successful formula was developed in the mid-1800s by Dr. John E. Park. We know that lime has been used since Roman Times either as mass foundation concretes or as lightweight concretes using a variety of aggregates combined with a wide range of pozzolans (fired materials) that help to achieve increased strength and speed of set. This meant that lime could be used in a much wider variety of applications than previously such as floors, vaults or domes. Over the last decade, there has been a renewed interest in using lime for these applications again. This is because of environmental benefits and potential health benefits, when used with other lime products.

Environmental Benefits

  • Lime is burnt at a lower temperature than cement and so has an immediate energy saving of 20% (although kilns etc. are improving so figures do change). A standard lime mortar has about 60-70% of the embodied energy of a cement mortar. It is also considered to be more environmentally friendly because of its ability, through carbonation, to re-absorb its own weight in Carbon Dioxide (compensating for that given off during burning).
  • Lime mortars allow other building components such as stone, wood and bricks to be reused and recycled because they can be easily cleaned of mortar/limewash.
  • Lime enables other natural and sustainable products such as wood (including woodfibre, wood wool boards), hemp, straw etc. to be used because of its ability to control moisture (if cement were used, these buildings would compost!).

Health Benefits

  • Lime plaster is hygroscopic (literally means 'water seeking') which draws the moisture from the internal to the external environment, this helps to regulate humidity creating a more comfortable living environment as well as helping to control condensation and mould growth which have been shown to have links to allergies and asthmas.
  • Lime plasters and limewash are non-toxic, therefore they do not contribute to indoor air pollution unlike some modern paints.

Pervious concrete:Pervious concrete, used in permeable paving, contains a network of holes or voids, to allow air or water to move through the concrete.This allows water to drain naturally through it, and can both remove the normal surface-water drainage infrastructure, and allow replenishment of groundwater when conventional concrete does not.It is formed by leaving out some or all of the fine aggregate (fines). The remaining large aggregate then is bound by a relatively small amount of Portland cement. When set, typically between 15% and 25% of the concrete volume is voids, allowing water to drain at around 5 gal/ft²/ min (70 L/m²/min) through the concrete.
Gypsum concrete:Gypsum concrete is a building material used as a floor underlaymentused in wood-frame and concrete construction for fire ratings,sound reduction,radiant heating, and floor leveling. It is a mixture of gypsum, Portland cement, and sand.

 

 

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