- 1 GRADES OF CONCRETE?
- 2 DIFFERENT GRADES OF CONCRETES AND ITS USE?
- 3 Regular to High Strength Grades of Concrete and Their Uses?
- 4 CEMENT SAND AND AGGREGATE REQUIRED FOR M15, M10, M7.5, M5, M3 GRADE CONCRETE?
- 5 WHAT IS M15 GRADE CONCRETE?
- 6 WHAT IS M20 GRADE CONCRETE?
- 7 WHAT IS M25 GRADE CONCRETE?
- 8 WHAT IS M30 GRADE CONCRETE?
GRADES OF CONCRETE?
There are different Grades of Concrete like M1O, M20, M25, and M30 denote concrete models according to their difference in strengths.
A structural engineer suggests What Grades of cement should be used for particular works such as Foundation, Slabs, Beams, Columns, Projections, etc.
The M describes the Mix design of concrete while the strength digits in N/mm2. Therefore concrete is known by its compressive strength.
There are different Grades of concrete such as M10 M15 M20 M25 M30 etc the usage of right concrete grades depends on advice given by the Structural engineer.
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Higher types of grade concrete should be used in an environment with severe and extreme conditions, unlike the lower grades of concrete.
THE MIX IS THE REPRESENTATIONS OF INGREDIENT PROPORTIONS:
- Fine aggregate.
- Coarse aggregate.
TYPES OF CONCRETE ARE CLASSIFIED MAINLY INTO FOUR CATEGORIES:
- Lean concrete.
- Ordinary grade.
- Standard grade.
- High strength concrete.
DIFFERENT GRADES OF CONCRETES AND ITS USE?
|Grade (Mpa)||Grade (Psi)||DIFFERENT GRADES OF CONCRETE AND ITS USE|
|M5||725psi||Rarely used for non Structural purposes.|
|M7.5||1088psi||Rarely used for non Structural purposes.|
|M10||1450psi||Patio slabs, pathways, and non-structural work.|
|M15||2175psi||Pavement kerbs and floor blinding.|
|M20||2900psi||Domestic floors and foundations (where the weight of the structure will be lighter). Also good for workshop bases, garages, driveways, and internal floor slabs.|
|M25||3625psi||Construction in all areas. Multi-purpose concrete mix, usually used for foundations.|
|M30||4350psi||Pathways and roadways (this is the lowest grade concrete mix that can be used for this purpose). More durable than the grades that have come before, and thus is much more weather-resistant and can take heavy road traffic.|
|M35||5075psi||Commercial structures. This heavy concrete mix is usually used for creating external walls and slabs, as well as for structural piling.|
|M40||5800psi||Commercial construction sites, creating foundations and beams for structural support and roads. The most durable in this list, C40 can withstand chemical corrosion also, so is frequently used on farms where slurry could corrode structures, or in septic tanks.|
|M45||6525psi||As per requirement of higher strength concrete Structure|
|M50||7250psi||As per requirement of higher strength concrete Structure|
|M55||7975psi||As per requirement of higher strength concrete Structure|
|M60||8700psi||As per requirement of higher strength concrete Structure|
|M65||9425psi||As per requirement of higher strength concrete Structure|
Regular to High Strength Grades of Concrete and Their Uses?
Regular grades of concrete are M15, M20, M25, etc. For plain cement concrete works, generally, M15 is used. For reinforced concrete construction minimum M20 grade of concrete is used.
|DIFFERENT GRADES OF CONCRETE||Mix Ratio||COMPRESSIVE STRENGTH|
|NORMAL GRADE OF CONCRETE|
|M5||1 : 5 : 10||5 MPa||725 psi|
|M7.5||1 : 4 : 8||7.5 MPa||1087 psi|
|M10||1 : 3 : 6||10 MPa||1450 psi|
|M15||1 : 2 : 4||15 MPa||2175 psi|
|M20||1 : 1.5 : 3||20 MPa||2900 psi|
|STANDARD GRADE OF CONCRETE|
|M25||1 : 1 : 2||25 MPa||3625 psi|
|M30||Design Mix||30 MPa||4350 psi|
|M35||Design Mix||35 MPa||5075 psi|
|M40||Design Mix||40 MPa||5800 psi|
|M45||Design Mix||45 MPa||6525 psi|
|HIGH STRENGTH GRADE OF CONCRETE|
|M50||Design Mix||50 MPa||7250 psi|
|M55||Design Mix||55 MPa||7975 psi|
|M60||Design Mix||60 MPa||8700 psi|
|M65||Design Mix||65 MPa||9425 psi|
|M70||Design Mix||70 MPa||10150 psi|
CONCRETE MIX RATIO:
|Grade (Mpa)||Grade (Psi)||GRADES OF CONCRETE Mix Ratio||W/C Ratio|
|Cement||Fine Aggregate (Sand)||Coarse Aggregate (Stone Chips)|
|M45||6525psi||As per||Mix||Design||Mix Design|
|High Strength||M50||7250psi||As per||Mix||Design||Mix Design|
|M55||7975psi||As per||Mix||Design||Mix Design|
|M60||8700psi||As per||Mix||Design||Mix Design|
|M65||9425psi||As per||Mix||Design||Mix Design|
|M70||10150psi||As per||Mix||Design||Mix Design|
ONE CUBIC METER OF CONCRETE:
|For one cu m calculate the cement, sand, and aggregate with 0.5 ratios of water for the following grades of concrete M10, M15, M20, M25, and M30. DRY VOLUME 1.54|
|GRADE OF CONCRETE||PROPORTION||CEMENT||SAND|
|DENSITY 1440||DENSITY 1500|
|M10||1:03:06||0.154 m3||0.462 m3|
|(C:S:A)||221.76 kg||693 kg|
|M15||1:02:04||0.22 m3||0.44 m3|
|(C:S:A)||316.8 kg||660 kg|
|7.77 C.FT||15.5 C.FT|
|M20||1:1.5,:3||0.28 m3||0.42 m3|
|(C:S:A)||403.2 kg||630 kg|
|9.89 C.FT||14.83. C.FT|
|M25||1:01:02||0.385 m3||0.385 m3|
|(C:S:A)||554.4 kg||554.4 kg|
|13.59 C.FT||13.59 C.FT|
CEMENT SAND AND AGGREGATE REQUIRED FOR M15, M10, M7.5, M5, M3 GRADE CONCRETE?
Using the above procedure, materials required for different proportions are calculated and presented below.
For 20mm aggregate:
|M15||0.217 cu.m||0.434 cu.m||0.869 cu.m|
|6.25 Bags||15.34 cft||30.68 cft|
|M10||0.152 cu.m||0.456 cu.m||0.912 cu.m|
|4.38 Bags||16.11 cft||32.21 cft|
|M7.5||0.117 cu.m||0.468 cu.m||0.935 cu.m|
|3.37 Bags||16.52 cft||33.04cft|
For 40mm aggregate:
|M15||0.224 cu.m||0.449 cu.m||0.897 cu.m|
|6.46 Bags||15.84 cft||31.68 cft|
|M10||0.157 cu.m||0.471 cu.m||0.942 cu.m|
|4.52 Bags||16.64 cft||33.27 cft|
|M7.5||0.121 cu.m||0.483 cu.m||0.966 cu.m|
|3.48 Bags||17.06 cft||34.12cft|
|M5||0.098 cu.m||.490 cu.m||0.981 cu.m|
|2.83 Bags||17.33 cft||34.66 cft|
Amount of water needed for mixing concrete?
Water/Cement ratio is a ratio of the weight of water to weight cement. It changes based on the desired workability.
Quantity of water needed per 50kg bag of cement in liters. (IS 456)
Calculation of weight of sand and aggregate per bag of Cement?
IS456 Codebook recommends the following quantities of total aggregate per 50kg of cement to produce nominal mix concrete.
|GRADE||TOTAL(F.A + C.A)|
|M 5||800 kg|
|M 7.5||625 kg|
|M 10||480 kg|
|M 15||330 kg|
|M 20||250 kg|
Note: General ratio of fine aggregate to coarse aggregate is 1:2. The ratio can be adjusted between 1:1.5 to 1:2.5 based on the grading of fine aggregate and size of coarse aggregate. Choose water from the above table.
For M20 Grade Concrete
Sand is confirmed to Zone II(average grading). From the above table, we know the 250kg of total dry aggregate is needed.
|Sand per 50 kg bag||= (1 / (1+2)) x 250 kg|
|=83 kg ~ 85 kg|
|Aggregateper 50 kg bag||= (2 / (1+2)) x 250 kg|
|= 166 kg ~ 165 kg|
Note: Always use dry river sand because moisture in the sand may increase its weight, mess up the water-cement ratio and cause bulking of sand.
|per bag(50kg)||85 kg||165 kg|
Sand and Aggregate per bag of cement – M5, M7.5, M10, M15, M20
Quantities are calculated according to the above procedure with fine to coarse aggregate ratio as 1:2.
Quantities derived through the nominal mix method and design mix method are different from each other. From experimentation, we find out that M15 grade concrete, batched through the nominal mix method, has equivalent quantities of materials as M20 grade concrete batched by design mix method.
WHAT IS M15 GRADE CONCRETE?
M15 concrete grade concrete gets categorized as an ordinary grade. Its features, properties, and uses are quite close to M10 with a very slight difference.
PROPERTIES OF THE M15 GRADE CONCRETE:
It contains a mix ratio is 1:3:6 .1 cement .3 sand and six aggregate.M-15 M represents the mix, while 15 N/mm2 is the characteristic compressive strength of the concrete cube for 29 days.
M12 grade real nominal maximum size of aggregate is 20 mm; its specific gravity is 3.25 while the specific gravity of fine aggregate and the specific gravity of coarse aggregate is 2.6 and 2.65, respectively.
USAGE AND APPLICATION M15 GRADE CONCRETE:
- M15 concrete gets used as a PCC. A plain cement concrete.
- M15 grade gets used for construction pavement herbs.
- It is also ideal when floor binding.
- The grade concrete can get used to construct in a leveling course.
- M15 grade concrete can well get used in concrete roads.
- Due to its high strength, M15 specific grade is very applicable and useful for tall rise buildings.
- It used in plain concrete poured into preparing levels to form beddings for footing during construction.
- To gain a proper level while insulating the ground from humidity one should place laying builds layer barriers of sheets are and pour M15.
WHAT IS M20 GRADE CONCRETE?
M20 is also a common type of grade concrete. M20 has a compressive strength that gets added up to 28 days.
PROPERTIES OF THE M20 GRADE CONCRETE:
The M20 Grade Concrete comes in a mix ratio of 1:1.5:3 .1 cement.1.5 sand and three aggregate.
TheM20 stands for the mixture of aggregate, sand, and cement prepared so as the whole cement concrete cube of size becomes 154 cm by 15cm by another 15 cm.
The mixture concrete is characterized by the strength of 20mpa, while its examination may get suggested after around 28 days.
USAGE AND APPLICATION M20 GRADE CONCRETE:
- Grade of concrete M20 can get used as an RCC. Reinforced Cement Concrete.
- M20 works perfectly for the construction of internal floor slabs, columns, beams, and footing.
- M20 grade concrete gets also used for mild exposure.
- M20 gets popularly used on domestic floors and foundations where the average weight of the structure may be lighter.
- M20 grade concrete is ideal for high rising buildings since the more senior the concrete a grade has, the more it is useful in the rising of buildings.
- Degree of concrete M20 has an IS 45-2000 which has designated the whole concrete mix to construct items such as footings entirely.
WHAT IS M25 GRADE CONCRETE?
M25 grade concrete, unlike M15 and M20, is a standard type of grade concrete.M25 grade concrete is a higher grade concrete than M20.
PROPERTIES OF THE M25 GRADE CONCRETE:
M25 is a mixture composed of cement, fine aggregates and coarse aggregates with a ratio of 1:1:2 is 1cement, one sand, and two aggregates.
The water-cement rate should get maintained between o.4 and 0.6.
The grade M25 grade concrete has a compressive strength of 25n/mm2 within 28days of curing.
USAGE AND APPLICATION OF M25 GRADE CONCRETE:
- M25 grade concrete gets also used as an RCC, the Reinforced cement concrete.
- M25 is used majorly during the construction of slabs, columns, footing, or beams.
- M25 application is also suitable for use in any exposed work, where one doesn’t need to cover the concrete mixture for later finishing.
- M25 grade concrete is applicable for use in all areas of construction.
- The grade concrete M25 is multipurpose and can get used for constructing any foundation.
- The grade concrete of M25 is usually preferred when constructor engineers what to high rise a building, for instance, a 3 to 4 story building to resist the higher load range of load.
- Many constructors prefer to use M25 grade concrete for structures when casting of various structural elements.
- M25 can also be a good suggestion when constructors want to low rise building’s main structures.
WHAT IS M30 GRADE CONCRETE?
M30 is also a type of a standard kind of grade concrete.M30 grade is the lowest grade of concrete mix. It is also excellent weather resistant.
PROPERTIES OF THE M30 GRADE CONCRETE:
M30 concrete is a mix concrete archived at most after 28 days of curing.M30 grade gets specifically designed to file a minimum compressive of 30 MPa approx. 4400 PSI in 28 days.
Usually, with a nominal mix in which the proportion of cement, sand, and aggregates are in code.
One must design an M30 concrete mix that is economically proportioning all the ingredients to archive a blend with good strength and durability for construction sites. It comes with a mixture of designs, according to IS -10262-2009.
The compressive strength of M30 is the key characteristics used for defining concretes quality. Depending on various factors such as cement strength, production process, mix procedure, or water-cement ration.
Usage and application of M30 GRADE CONCRETE:
- M30 gets used as an RCC a Reinforced Cement Concrete
- M30 is also ideal for slabs, beams, footings and column construction
- Since M30 is the lowest grade of concrete is can be used for constructing pathways and roads
- Since it is water-resistant M30 concrete can ideal for building roads in areas that may be experiencing heavy traffic
The above are some of the popular grades of concrete prevalent for use in many construction sites.
They are handy for use in various forms depending on the compressive strength of the concretes. Remember that the concretes vary in resistance, and that should be used in environments depending on their compressive quality.
Grades of Concrete?
The Grades of Concrete can be achieved by changing the mix proportions ratios in concrete like Sand, Cement, Aggregate, etc. To achieve high strength grades of concrete one also use chemicals with the right design mix.
What are the Different Grades of Concrete?
Different grades of Concrete are M10 Grade, M15 Grade, M20 Grade, M25 Grade, M30 Grade, etc. The grades of concrete can be labeled based on their compressive strength.
What are the Grades of Concrete with Ratio?
The Grades of concrete with ratio (Cement : Sand : Aggregates) M10 1 : 3 : 6 | M15 1 : 2 : 4 | M20 1 : 1.5 : 3 | M25 1 : 1 : 2 | M30 Design Mix.
What is the Compressive Strength of M10 M15 M20 M25 M30 Concrete grades?
The Compression/Compressive strength of different concrete grades are M10 Concrete Grade 10MPa / 1450 psi | M15 Concrete Grade 15MPa / 2175 psi | M20 20MPa / 2900 psi | M25 25MPa / 3625 psi.
Which Grades of Concrete is used for Slab/Structure?
M20 Grade of Cement used for RCC (Reinforced Cement Concrete) works such as Slabs, Beams, Columns, Staircase, etc.
What is M15 Grade of Concrete?
A M15 Grade of Concrete is portioned / ratio at 1:2:4 (Cement : Sand : Aggregates). The compressive strength achieved after 28days is 15N/mm2.
What is M20 Grade of Concrete?
A M20 Grade of Concrete is portioned / ratio at 1 : 1.5 : 3 (Cement : Sand : Aggregates). The compressive strength achieved after 28days is 20N/mm2.
What is M25 Grade of Concrete?
A M25 Grade of Concrete is portioned / ratio at 1 : 1 : 2 (Cement : Sand : Aggregates). The compressive strength achieved after 28days is 25N/mm2.
Where M10 and M15 Grades of Concrete is used in Construction?
Generally M10 and M15 Grades of concrete is used in Foundation Bed, Leveling. A M15 Concrete is mixed in a ratio at 1:2:4 (Cement : Sand : Aggregates).