Concrete Engineering

Traditionally, chilled water and ice have been employed to reduce the temperature of concrete mix in hot weather condition. Chilled water has a limitation in its cooling potential. For instance, even if all mixing water has been converted into chilled water, the temperature reduction achieved in concrete mix is only about 2.7^oC.

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By
Raj Mohammad Khan

Following table shows the M-35 Mix Designs as per IS-10262-2009, hope this helps all civil engineers here
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By
Raj Mohammad Khan

Following table shows the M-30 Mix Designs as per IS-10262-2009, hope this helps all civil engineers here

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By
Raj Mohammad Khan

Following table shows the M-25Mix Designs as per IS-10262-2009, hope this helps all civil engineers here
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By
Raj Mohammad Khan

Following table shows the M-20 Mix Designs as per IS-10262-2009, hope this helps all civil engineers here

M-20 CONCRETE MIX DESIGN
As per IS 10262-2009 & MORT&H
A-1	Stipulations for Proportioning
1	Grade Designation	M20
2	Type of Cement	OPC 53 grade confirming to IS-12269-1987
3	Maximum Nominal Aggregate Size	20 mm
4	Minimum Cement Content (MORT&H 1700-3 A)	250 kg/m3
5	Maximum Water Cement Ratio (MORT&H 1700-3 A)	0.5
6	Workability (MORT&H 1700-4)	25 mm (Slump)
7	Exposure Condition	Normal
8	Degree of Supervision	Good
9	Type of Aggregate	Crushed Angular Aggregate
10	Maximum Cement Content (MORT&H Cl. 1703.2)	540 kg/m3
11	Chemical Admixture Type	Superplasticiser Confirming to IS-9103
A-2	Test Data for Materials
1	Cement Used	Coromandal King OPC 53 grade
2	Sp. Gravity of Cement	3.15
3	Sp. Gravity of Water	1.00
4	Chemical Admixture	Not Used
5	Sp. Gravity of 20 mm Aggregate	2.884
6	Sp. Gravity of 10 mm Aggregate	2.878
7	Sp. Gravity of Sand	2.605
8	Water Absorption of 20 mm Aggregate	0.97%
9	Water Absorption of 10 mm Aggregate	0.83%
10	Water Absorption of Sand	1.23%
11	Free (Surface) Moisture of 20 mm Aggregate	nil
12	Free (Surface) Moisture of 10 mm Aggregate	nil
13	Free (Surface) Moisture of Sand	nil
14	Sieve Analysis of Individual Coarse Aggregates	Separate Analysis Done
15	Sieve Analysis of Combined Coarse Aggregates	Separate Analysis Done
15	Sp. Gravity of Combined Coarse Aggregates	2.882
16	Sieve Analysis of Fine Aggregates	Separate Analysis Done
A-3	Target Strength for Mix Proportioning
1	Target Mean Strength (MORT&H 1700-5)	30N/mm2
2	Characteristic Strength @ 28 days	20N/mm2
A-4	Selection of Water Cement Ratio
1	Maximum Water Cement Ratio (MORT&H 1700-3 A)	0.5
2	Adopted Water Cement Ratio	0.5
A-5	Selection of Water Content
1	Maximum Water content (10262-table-2)	186 Lit.
2	Estimated Water content for 25 mm Slump	145 Lit.
3	Superplasticiser used	nil
A-6	Calculation of Cement Content
1	Water Cement Ratio	0.5
2	Cement Content (145/0.5)	290 kg/m3
		Which is greater then 250 kg/m3
A-7	Proportion of Volume of Coarse Aggregate & Fine Aggregate Content
1	Vol. of C.A. as per table 3 of IS 10262	62.00%
2	Adopted Vol. of Coarse Aggregate	65.00%
	Adopted Vol. of Fine Aggregate ( 1-0.65)	35.00%
A-8	Mix Calculations
1	Volume of Concrete in m3	1.00
2	Volume of Cement in m3	0.09
	(Mass of Cement) / (Sp. Gravity of Cement)x1000
3	Volume of Water in m3	0.145
	(Mass of Water) / (Sp. Gravity of Water)x1000
4	Volume of Admixture @ 0% in m3	nil
	(Mass of Admixture)/(Sp. Gravity of Admixture)x1000
5	Volume of All in Aggregate in m3	0.763
	Sr. no. 1 – (Sr. no. 2+3+4)
6	Volume of Coarse Aggregate in m3	0.496
	Sr. no. 5 x 0.65
7	Volume of Fine Aggregate in m3	0.267
	Sr. no. 5 x 0.35
A-9	Mix Proportions for One Cum of Concrete (SSD Condition)
1	Mass of Cement in kg/m3	290
2	Mass of Water in kg/m3	145
3	Mass of Fine Aggregate in kg/m3	696
4	Mass of Coarse Aggregate in kg/m3	1429
	Mass of 20 mm in kg/m3	1029
	Mass of 10 mm in kg/m3	400
5	Mass of Admixture in kg/m3	nil
6	Water Cement Ratio	0.5

We are thankful to Er. Raj M. Khan for sharing this information with us on engineeringcivil.com. We hope this would be of great significance to civil engineers.

Dear All,
Here i am giving the mix designs as per IS-10262-2009 which gives to change the procedure for calculating the concrete ingredients
Raj Mohammad Khan

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By
Er. Kaushal Kishore ,
Materials Engineer, Roorkee

INTRODUCTION
Superplasticizers belongs to a class of water reducer chemically different from the normal water reducers and capable of reducing water content by about 30%. The Superplasticizers are broadly classified into four groups: sulfonated melamine formaldehyde condensate (SMF), sulphonated naphthalene formaldehyde condensate (SNF), modified lignosulphonate (MLS) and others including sulphonic acid ester, polyacrylates, polystryrene sulphonates, etc. The benefits obtained by Superplasticizers in the reduction of water in the concrete mixes are best illustrated by the following examples.
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What is Ductal?
Few Years back in 2006; researchers at Iowa State University have developed a new type of concrete that is much stronger than conventional concrete. It can withstand pressures up to 595,000 pounds — more than the weight of seven semi trucks.

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The concrete mix design available on this site are for reference purpose only. Actual site conditions vary and thus this should be adjusted as per the location and other factors. These are just to show you how to calculate and we are thankful to all the members who have emailed us these mix designs so that these could be shared with civil engineers worldwide.

If you also have any mix design and want to share it with us, just comment on this post and we will be in touch with you.

Here is the summary of links of all the mix designs we have till date:-

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The mix design M-50 grade (Using Admixture –Sikament) provided here is for reference purpose only. Actual site conditions vary and thus this should be adjusted as per the location and other factors.

Parameters for mix design M50

Grade Designation = M-50
Type of cement = O.P.C-43 grade
Brand of cement = Vikram ( Grasim )
Admixture = Sika [Sikament 170 ( H ) ]
Fine Aggregate = Zone-II

Sp. Gravity
Cement = 3.15
Fine Aggregate = 2.61
Coarse Aggregate (20mm) = 2.65
Coarse Aggregate (10mm) = 2.66

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