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### Effect of Maximum size of Aggregate on Strength:

At one time it was thought that the use of larger size aggregate leads to higher strength.*This was due to the fact that the larger the aggregate the lower is the total surface area and,*

*therefore, the lower is the requirement of water for the given workability. For this reason, a*

*lower water/cement ratio can be used which will result in higher strength.*

However, later it was found that the use of larger size aggregate did not contribute to

*higher strength as expected from the theoretical considerations due to the following reasons.*

*The larger maximum size aggregate gives lower surface area for developments of gel*

*bonds which is responsible for the lower strength of the concrete. Secondly bigger aggregate*

*size causes a more heterogeneity in the concrete which will prevent the uniform distribution*

*of load when stressed.*

When large size aggregate is used, due to internal bleeding, the transition zone will

*become much weaker due to the development of micro cracks which result in lower*

*compressive strength.*

Generally, high strength concrete or rich concrete is adversely affected by the use of large

*size aggregate. But in lean mixes or weaker concrete the influence of size of the aggregate*

*gets reduced. It is interesting to note that in lean mixes larger aggregate gives highest strength*

*while in rich mixes it is the smaller aggregate which yields higher strength. Fig. 1 shows*

*the influence of maximum size of aggregate on compressive strength of concrete. Fig. 2*

*depicts the influence of size of aggregate on compressive strength of concrete for different w/*

*c ratio.*

I hope that this article will help you to understand WHAT ARE THE QUALITIES OF GOOD BUILDING STONES

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