The strength of concrete is impacted by various
factors. The details are given below :-
Concrete porosity: Air and water are the useful
substances to fill up voids in concrete. Air voids belong to pores in concrete.
When concrete is blended it contains air trapped in the mix. The vibrators are
used to clear out the air at the time of pouring walls.
If the concrete is less porous, it’s strength will be increased
and calculated with compressive strength. The most crucial source of porosity
in concrete refers to the proportion of water to cement in the mix, called the
‘water to cement ratio’.
Factors
water/cement ratio: It is described as the mass of water divided by the mass of
cement in a mix. As for instance, in a concrete mix if there are 400kg cement
and 240litres(=240kg) of water, the water/cement ratio will be 240/400=0.6. The
water cement ratio is shortened as ‘w/c ratio’ or just ‘w/c’. In mixes where
the w/c is in excess of roughly 0.4, all the cement can, in theory, react with
water to develop cement hydration products. If the w/c ratios are greater, it
follows that the space occupied by the supplementary water over w/c=0.4 will
persist as pore space filled with water, or with air when the concrete becomes
dry.
As
a result, when the w/c ratio become higher, the porosity of the cement paste in
the concrete also upsurges. With the higher porosity, the compressive strength
of the concrete will reduce.
Stability of aggregate: It is inevitable that
when the aggregate in concrete is feeble, the concrete also becomes feeble.
Rocks like chalk that contain low intrinsic strength, are not appropriate to be
utilized as aggregate.
Aggregate-paste bond: The strength of the bond
among the paste and the aggregate is vital. When no bond exists, the aggregate
practically reproduces a void and the strength of concrete is decreased.
Cement-related parameters: Various parameters pertaining to the
formation of the individual cement minerals and their ratios in the cement can
impact the rate of strength growth and the final strengths gained.
To get more information, click on the following link www.onlinecivilforum.com
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Published By
Rajib Dey
www.constructioncost.co
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