1. REQUIREMENTS
a) Specified minimum strength = 20 N/Sq mm
b) Durability requirements
i) Exposure Moderate
ii) Minimum Cement Content = 300 Kgs/cum
c) Cement
(Refer Table No. 5 of IS:456-2000)
i) Make Chetak (Birla)
ii) Type OPC
iii) Grade 43
d) Workability
i) compacting factor = 0.7
e) Degree of quality control Good
2. TEST DATA FOR MATERIALS SUPPLIED
a) CEMENT
i) Specific gravity = 3.05
ii) Avg. comp. strength 7 days = 46.5 more than 33.0 OK
28 days = 55.0 more than 43.0 OK
b) COARSE AGGREGATE
i) 20mm Graded
Type Crushed stone aggregate
Specific gravity = 2.68
Water absorption = 1.46
Free (surface) moisture = 0
c) FINE AGGREGATE (Coarse sand)
i) Type Natural (Ghaggar)
Specific gravity = 2.6
Water absorption = 0.5
Free (surface) moisture = 1.4
3. TARGET MEAN STRENGTH (TMS)
a) Statistical constant K = 1.65
b) Standard deviation S = 4.6
Thus, TMS = 27.59 N/Sqmm
4. SELECTION OF W/C RATIO
a) As required for TMS = 0.5
b) As required for ‘Moderate’ Exposure = 0.55
Assume W/c ratio of 0.5
5. DETERMINATION OF WATER & SAND CONTENT
For W/C = 0.6
C.F. = 0.8
Max. Agg. Size of 20 mm
a) Water content = 186 Kg/cum
b) Sand as percentage of total aggregate by absolute volume = 35 %
Thus,
Net water content = 180.42 Kg/cum
Net sand percentage = 33 %
6. DETERMINATION OF CEMENT CONTENT
W/c ratio = 0.5
Water content = 180.42 Kg/cum
Thus, Cement content = 360.84 Kg/cum Adequate for moderate exposure Say 360 Kg/cum
7. DETERMINATION OF COARSE AND FINE AGGREGATE CONTENT
Assume entrapped air as 2 %
Thus,
0.98 cum = [180.42+360/3.05 + {1/0.33}*{fa/2.6}]/1000
& 0.98 cum = [180.42+360/3.05 + {1/0.67}*{Ca/2.68}]/1000
Hence,
fa = 584 Kg/cum
Ca = 1223.8 Kg/cum
The final mix proportions of M-20 grade of concrete become:-
Note: 1 The above recommended mix design must be verified, by actual cube tests.
2 The mix design is based on the quality and grading of the materials actually supplied, by the client.
Any variation in quality and gradation will result in changes in the mix design.
This mix design was submitted by a regular contributor to this site. We are thankful to him for his excellent service.
If you have a query, you can ask a question here.
what is the grade 25 concreet
m25 grade 1:1:2
Dear sir
i would like to know about wat wil be the ratio of m-20
m20 grade 1:1.5:3
1:1.5:3
1.3:1.6:1.5
Sir, pls tell me the thumb rule for finding quantities in 1 cum concrete, example M20 mix what is the quantity of cement, coarse aggregate,fine agregate, and water
I would like know about the mix design for hollow block and paver block (m20)
Ple tell me DETAILS OF cONCRETE 1M CUM HOW MACH K.G
it depend on grades
i want ratios of m30 to m60 with weight
Sir, pls tell me the thumb rule for finding quantities in 1 cum concrete, example M20 mix what is the quantity of cement, coarse aggregate,fine agregate, and water
Sir, I want to know what is the ratio of M20 grade concrete mix and what quality of cement to be use
Mix ratio of M-20 Grade concrete is 1:1.5:3 and you can use opc and ppc cement otherwise as per specificatio
ratio:1:1.5:3 and cement should be opc grade 43.
Pls sir can you tell me the mixture to obtain concrete mix grade 7. thank you very much in advance
There are No G 7 Concrete in Industry only G10 G15 G20 G25 G30 G35 G40 something Like that
How is this graded? whats the best grade for screeding, rendering mortars, concrete beams, concrete columns, concrete watertanks and concrete slabs?
If the mix is:
350 kg cement
0,800m3 aggregat
0,400m3 sand
which gread this will be?
i want to know about the cement consumption in 1 cubic meter RCC (1:1.5:3) and PCC (1:2:4).
1,1:1.5:3 (M20) 7.5 bag cement in 1 m3
2, 1:2:4 (M15) 6.8 bag cement in 1 m3
Dear sir,
i want to know about the thumb rule for finding quantities in 1 cum concrete, example M40 mix what is the quantity of cement, coarse aggregate,fine agregate, and water
rcc=8.23 bags (1:1.5:3)
Sir , please tell me about thumb rule for calculating the quantities in a design mix
Sir, pls tell me the thumb rule for finding quantities in 1 cum concrete, example M20 mix what is the quantity of cement, coarse aggregate,fine aggregate, and water
hello… i want to know what chemical is used for M20 grade concrete during casting ?
Dear sir,
i want to know about the thumb rule for finding quantities in 1 cum concrete, example M40 mix what is the quantity of cement, coarse aggregate,fine agregate, and water
sir what is the lean concrete.,m20 & its quantities at site like this thumb rules
Dear all,
M20, M25 ,M35 are all the grades of concrete with their compressive strength at 28 days (of 15mm cube) being shown by their respective nos.
M25 = Compressive strength of a 150 mm cube of this concrete after 28 days will have a strength of 25 Newton / mm2.
How different grade of concrete is made is just not the issue of what amount of cement is to be used but what type of cement, aggregate & sand is being used also effects the stregth and thereby the grade.
For general reference however table 5 of IS 456-2000 can be used
Also Refer to table 9 of same code
you guys can make a graph according to table 9 and see for the quantities required as per grade for higher grade of concrete i hope that will suit well.
how can i calculate the quantity of isolated footing?