Though larger pieces of gravel produce more friction and make it harder to mix, they also make a stronger concrete. Water also plays a part in how much sand and gravel to use. The more water you add, the weaker the mixture becomes. Adding aggregate to the mix reduces the amount of water.
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Though larger pieces of gravel produce more friction and make it harder to mix, they also make a stronger concrete. Water also plays a part in how much sand and gravel to use. The more water you add, the weaker the mixture becomes. Adding aggregate to the mix reduces the amount of water.