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it Gives Better estimation and assumption on how much it could carry. By logic, higher strength concrete is used on larger loads therefore, it is still not sure if the loads will be larger than the specified concrete strength. Therefore, having lower permissible strenth helps designers to have allowances for loadings to ensure safety

Q: Why permissible compressive strength decreases with increase in grade of concrete?

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Micro structure of concrete with nano materials gets changed like anything and is resulting tremendous increase in compressive strength apart from increase in specific surface area.

If you are using a traditional concrete mix you can increase the slump by increasing the water you add.

The span to depth ratio is in place preliminary as a method of ensuring deflections falls within certain limits. As concrete is a multi-phase material and does not behave linearly, it is often complex to calculate expected accurate deflections. codes set out given span/depth ratios as a simpler method or ensuring deflections remain in given limits. These ratios have been derived empirically from testing. The compressive strength of concrete as a material does not vary with varying span/depth. However, the amount of the concrete section which is in compression will vary with span and depth due to changes in the applied moment and increase/reduction of the internal lever arm.

It decreases petroleum's availability

Mineral admixture are those which are mixed with concrete ingredients and spread through out the body of concrete to favourably modify the properties of concrete . the commonly used mineral admixture are1. Fly ash2. Silica fume3. Rice Husk ash4. matakaoline

Related questions

Micro structure of concrete with nano materials gets changed like anything and is resulting tremendous increase in compressive strength apart from increase in specific surface area.

concrete strenght gain at first 7 days much increase so we consider 7days strenght

Larger the size of aggregate will decrease strength of the concrete because surface area of this aggregate is low.Lesser the size of the aggregate will lead to increase the strength of the concrete.Well graded aggregate have all size of particles hence particle interferance is neglected,thus strength of concrete is more.

decreases

No, it decreases.

Decreases.

increase

presure

No, it decreases.

Temperature decreases as altitude increases in the troposphere

No the resolution would increase as wavelength of the illuminating light decreases.

Pressure increase when temperature increase.