Specification of M50 concrete mix design

Concrete mix design belongs to the method of determining the ratios of concrete mix in terms of proportions of cement, sand and coarse aggregates.

As for instance a concrete mix of proportions 1:2:4 signifies that cement, fine and coarse aggregate are in the ratio 1:2:4 or the mix comprises of one part of cement, two parts of fine aggregate and four parts of coarse aggregate.

The concrete mix design proportions are both by volume or by mass. The water-cement ratio is normally stated in mass.

The mix design M-50 grade (with Admixture –Sikament) presented here is for reference purpose only. Actual site conditions may fluctuate and consequently, this should be modified as per the location and other factors.

M50 Grade concrete is mostly suitably in heavily reinforced structures to withstand dynamic loading.

Given below the specifications of M50 Concrete Mix Design

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
Minimum Cement (As per contract) =400 kg / m3
Maximum water cement ratio (As per contract) = 0.45

Mix Calculation: –
1. Target Mean Strength = 50 + ( 5 X 1.65 ) = 58.25 Mpa

2. Selection of water cement ratio:-
Suppose water cement ratio = 0.35

3. Calculation of water: Estimated water content for 20mm max. Size of aggregate = 180 kg /m3 (As per Table No. 5 , IS : 10262 ). As plasticizer is projected, water content is decreased by 20%.

Water content is taken as 180 X 0.8 = 144 kg /m3

For more details, click on the following link engineeringcivil.com

Read more

~~~~~~~~~~~~~~~~~~~~~~~~
Published By
Rajib Dey
www.constructioncost.co
~~~~~~~~~~~~~~~~~~~~~~~~

Some misconceptions in concrete and cement sectors

This construction video tutorial presented by Portland Cement Association, focuses on some most recognized but fallacious concepts in concrete construction specifically the most usual mistakes related to cement and concrete industries.

The video is supported with examples, interviews, and illustrations and very effective for the workers who have good experience levels.

Given below, the proper steps to get rid of these misconceptions :-

Wrong Idea: A concrete mix should be identified with the number of bags of cement.

Fact: Besides, cement content, mixes should be also identified on the basis of performance and needs. Identifying bags of cement devoid of bonding in the amount of water is no specification in any case. One of the most vital points of a concrete mix belongs to the water to cement ratio. Mixes required to satisfy performance requirements via a minimum compressive strength that monitored with the amount of water in the mix not only the cement content.

Wrong Idea: The only method to raise slump is to include water to the mix.

Fact: Besides adding water, the slump of concrete can be raised with several methods. If only one gallon of water is added to one cubic yard of concrete, effect will be raising slump just one inch and reducing compressive strength 150 to 200 psi. Therefore, approx. one quarter bag of cement will be wasted and shrinkage will be raised. In order to set slump the jobsite devoid of inclusion of more water, it is suggested to apply a water reducer or super plasticizer at the jobsite to raise the slump whereas sustaining the water to cement ratio.

To get more information, watch the following video.

Read more

~~~~~~~~~~~~~~~~~~~~~~~~
Published By
Rajib Dey
www.constructioncost.co

~~~~~~~~~~~~~~~~~~~~~~~~