OPC 53 sets quicker than OPC 43 and has a quite low initial setting time. It is used in structures where rapid strength gain is required like large load bearing structures like bridges, huge buildings, etc. OPC 43 on the other hand doesn't set so quickly and has a normal initial and final setting time.
@madhukumari7542 53 Grade cement is used for fast paced construction were initial strength is to be achieved quickly. 53 Grade cement has fast setting compared to 43-grade cement. 53 Grade attains 27 Mpa in 7 days compared to 23 Mpa by 43-grade cement.
The fineness of cement affects the hydration rate, and in turn, the strength. Increasing fineness causes an increased rate of hydration, high strength, and high heat generation. Bleeding can be reduced by increasing fineness.
The fineness of cement means the size of the particle of cement, which should not exceed 90 microns when sieved in accordance with IS standards. Notably, the test should be carried out as per IS 4031 Part-I, and the sample should be collected as per IS 3535. The cement fineness is measured by the specific surface area (SSA) expressed in sq m per kilogram (m²/kg). The SSA is calculated by dividing the total surface area of the cement particles by the weight of the cement.
The fineness of cement is represented by the specific surface, which is expressed as the total surface area in sq. cm/g. of cement. Blaine’s Air Permeability Test is used to find the specific surface. The principle is based on the relationship between the rate of flow of air through a cement bed. The cement bed is of a given porosity comprising the surface area of the particles. The surface area is more for finer particles. If you find this useful please vote with a like
W = 0.500ρV W=0.500×3.06×1.86 W=2.84g ⍴= Density of test sample V= Bulk volume of bed of cement, cmᶾ, as determined above, e=Desired porosity of bed of cement (0.500±0.005) We request that you watch the video again without skipping. The calculation of the weight of cement has already been described there.
1st time wt. of cement kese liya 4:40 pr or calculation 0.500×3.06×1.86 me 3.06 kha se aaya or is calculation se wt. of cement 2.84 aa rha h jbki video me 2.92g kha se aaya
Dost different sample ke liye different density hoga, 3.06 cement sample ka density hai Aur K factor ke liye jo standard cement use huwa hai uski density different hai isliye Dona ka weight diffrent hai,
The density of a cement sample is 3.06, and the density of the standard cement used for the K factor is different. As a result, the weights of the two samples will be different.
53 Grade cement is used for fast paced construction were initial strength is to be achieved quickly. 53 Grade cement has fast setting compared to 43-grade cement. 53 Grade attains 27 Mpa in 7 days compared to 23 Mpa by 43-grade cement.
Very nice Video
Thanks
Nyc explain ❤❤❤
Thanks you
Thank you very much sir
Thank you
Superb
Thank you
Nice information
Thanks dear
Which is batter OPC 43 and OPC 53
OPC 53 sets quicker than OPC 43 and has a quite low initial setting time. It is used in structures where rapid strength gain is required like large load bearing structures like bridges, huge buildings, etc. OPC 43 on the other hand doesn't set so quickly and has a normal initial and final setting time.
53
@madhukumari7542 53 Grade cement is used for fast paced construction were initial strength is to be achieved quickly. 53 Grade cement has fast setting compared to 43-grade cement. 53 Grade attains 27 Mpa in 7 days compared to 23 Mpa by 43-grade cement.
What is the effect of increasing the fineness of cement?
The fineness of cement affects the hydration rate, and in turn, the strength. Increasing fineness causes an increased rate of hydration, high strength, and high heat generation. Bleeding can be reduced by increasing fineness.
Sir bed volume ke reference cement lena our standard crment lena
Yes
Bhai ji blains fineness kya hota hai plz..
The fineness of cement means the size of the particle of cement, which should not exceed 90 microns when sieved in accordance with IS standards. Notably, the test should be carried out as per IS 4031 Part-I, and the sample should be collected as per IS 3535. The cement fineness is measured by the specific surface area (SSA) expressed in sq m per kilogram (m²/kg). The SSA is calculated by dividing the total surface area of the cement particles by the weight of the cement.
The fineness of cement is represented by the specific surface, which is expressed as the total surface area in sq. cm/g. of cement. Blaine’s Air Permeability Test is used to find the specific surface.
The principle is based on the relationship between the rate of flow of air through a cement bed. The cement bed is of a given porosity comprising the surface area of the particles. The surface area is more for finer particles.
If you find this useful please vote with a like
Bhai manomiter ka oil ka mark kitna kiye ho aap
Our manometer (Blain's air permeability appretus), which is designed as per IS 1727, So we can suggest that you please follow this standard.
Sir S ka Value 419 kaha se aaya
The value of S is given in the certificate of standard-certified reference material (CRM). The K factor is determined by substituting the value of S.
wt. of sample 2.84gm kha se aaya last me
pls tell me
W = 0.500ρV
W=0.500×3.06×1.86
W=2.84g
⍴= Density of test sample
V= Bulk volume of bed of cement, cmᶾ, as determined above,
e=Desired porosity of bed of cement (0.500±0.005)
We request that you watch the video again without skipping. The calculation of the weight of cement has already been described there.
isse to bed of cement ka wt. aayega na
test ke liye sample ka wt. kese niklega
1st time wt. of cement kese liya 4:40 pr
or calculation 0.500×3.06×1.86 me 3.06 kha se aaya
or is calculation se wt. of cement 2.84 aa rha h jbki video me 2.92g kha se aaya
Dost different sample ke liye different density hoga, 3.06 cement sample ka density hai
Aur K factor ke liye jo standard cement use huwa hai uski density different hai isliye Dona ka weight diffrent hai,
2.8 anumanit wt kaise le rhe
Bhai aap vol. Of bed q nikal rahe ho
बेड वाल्यूम सीमेंट की मात्रा के निर्धारण हेतु निकलते है।।
❤
Thanks you
for the calibration you took 2.92 g wieght of cement but in the end you took 2.84 g howcome !!!!
The density of a cement sample is 3.06, and the density of the standard cement used for the K factor is different. As a result, the weights of the two samples will be different.
Very nice video
Thanks
Which is batter of OPC 43 and OPC 53
53 Grade cement is used for fast paced construction were initial strength is to be achieved quickly. 53 Grade cement has fast setting compared to 43-grade cement. 53 Grade attains 27 Mpa in 7 days compared to 23 Mpa by 43-grade cement.