Water Cement Ratio for M20 Grade Concrete || By CivilGuruji
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- Опубликовано: 20 июл 2021
- #civilguruji #civilengineerstraininginstitute #Construction #concrete
Water cement ratio for m20 grade of concrete
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Hello Civil Engineers,
In this video Corporate Trainer Er. Kishan Ojha tells you about the volume of water required for making concrete of required strength.
The water-cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix. A lower ratio leads to higher strength and durability, but may make the mix difficult to work with and form. Workability can be resolved with the use of plasticizers or super-plasticizers.
Often, the ratio refers to the ratio of water to cementitious materials, w/cm. Cementitious materials include cement and supplementary cementitious materials such as fly ash, ground granulated blast-furnace slag, silica fume, rice husk ash and natural pozzolans. Supplementary cementitious materials are added to strengthen concrete.
The notion of water-cement ratio was first developed by Duff A. Abrams and published in 1918. Refer to concrete slump test. The 1997 Uniform Building Code specifies a maximum of 0.5 ratio when concrete is exposed to freezing and thawing in a moist condition or to de-icing chemicals, and a maximum of 0.45 ratio for concrete in a severe or very severe sulfate condition.
Concrete hardens as a result of the chemical reaction between cement and water (known as hydration, this produces heat and is called the heat of hydration). For every pound (or kilogram or any unit of weight) of cement, about 0.35 pounds (or 0.35 kg or corresponding unit) of water is needed to fully complete hydration reactions.[1]
However, a mix with a ratio of 0.35 may not mix thoroughly, and may not flow well enough to be placed. More water is therefore used than is technically necessary to react with cement. Water-cement ratios of 0.40 to 0.60 are more typically used. For higher-strength concrete, lower ratios are used, along with a plasticizer to increase flowability.
Too much water will result in segregation of the sand and aggregate components from the cement paste. Also, water that is not consumed by the hydration reaction may leave concrete as it hardens, resulting in microscopic pores (bleeding) that will reduce final strength of concrete. A mix with too much water will experience more shrinkage as excess water leaves, resulting in internal cracks and visible fractures (particularly around inside corners), which again will reduce the final strength.
Yes.. thanks for this video..it was my question only nearly since 1 month back
Thank you sir..aap bahut ache se explanation karte hai
Thank You sir:)
Most welcome!
Useful content...... Superb 💐
Well done sir make more videos of concrete 👍
Thanks sir
Very nice
Good sir g
See, This table for Minimum cement content and Maximum water cement ratio, is not in IS10262-2019, Its in IS 456-2000, Table 5
Tnk u
Concrete ure motor me use hone wale send Aur aggregates Ke size ka define kar dijiye please.
Kis zone me kya use hota h.
Sir ap full chapter video bhi bnaya kro plz full support
Thanku sir🥰🙏
Most Welcome
Mix design me 1m3 me cement sand or aggregate ki quantity kese nikale...is pe ek vedio bnaye
What should be the ratio of Ambuja Kavach Cement to Slab Casting
Thanks
Most Welcome
Plaster ke lliye ya chunai ke masale ke liye kitna pani dalenge 1 bag cement me
Any codal reference for ratio to grade
Where did constant figure 0.55 from??
Sir mix design kese karte h
Sir offline training kab se start hogi
Sir 1m3 ke liye kaise krenge
Sir isme sand or gravel kitna kitna lenge ye to btao sir
What min M5 gread
After training placement hogi
Sir what is 0.4 to 06
Pls explain
Hi dear sir, kiya aap k institute say online training hosakti hai? I mean is Pakistani students are eligible for this program Or otherwise it is just for national wise! Please provide guidance to me.
Butt is code mai to m20 ke liye water 30 litre given hai?????
55 to 60% of 50kg cement=30kg or lit of water =w/c ratio 0.6 for M20 ..thts is enough 😊
Hii sir job pane ke liye Kay Kare
sir job mil Nhi rha h
Cops trening karta hu
Kaisha resume banaye ki aashani se job mil jaye
M60 me kitna add karna chaiye
0.035 is value of what? And what’s it unit?
Wrong is code it's available in 456:2000
Yes is 456:2000
Acha g I am a quality engineer work
Hy sir, I am from Bangladesh.
I can't call this nombor.
Sir pcc aur rcc me jyada achha kon sa hota hai
PCC means plain cement concrete RCC means rainforcement cement concrete RCC me Steel bar rhta h aur PCC me nhi rhta sirf Cement sand and aggregate rhta hai
But 1 bag cement= 35 litter and 50kg it's not equal
Anil
Me engineer nahi ho to kya ye join kar sakta hun
Anyone jise construction me interest hai, wo iss courses ko le sakta hai. Agar aap aur jankari lena chahte hai to hu,e iss👉 no. 9111001234 par call kar sakte hai. Hamari team apko guide kar dengi.
Khash video for civil engineer
Water bhi KG me nikal diya
IS-10262:2009 not 9000
Civil guruji m30 concrete ka grade 1:1:3 kaab se hone laga iss hisab se toh cement bags 9 use honge per cu.m ke liye thoda research kijia adhura knowledge mat bata karo......
1 bag ma 25 litres
35
Exam k baad aaunga June k baad
IS 10262-2019 not 9000