What makes one brick tougher than another? The size of the sand grains mixed into the clay affects how well the brick holds together after firing.
You make two batches of five bricks each. One batch uses fine sand mixed with clay. The other uses coarse sand. Both use the same ratio and the same amount of water. After drying for two days, you fire the bricks in an oven at 900 degrees Celsius for 24 hours. Then you drop each brick from a height of 2 meters and count how many drops it survives.
Coarse-sand bricks last an average of 2.6 drops. Fine-sand bricks last only 1.6 drops. Coarse grains produce a more durable brick.
Hypothesis
The hypothesis is that coarse sand particles make more durable bricks than fine sand particles.
The size of sand grains mixed into clay affects how well a fired brick holds together. You make two batches of five bricks each — one with fine sand, one with coarse sand — dry them, then fire both at 900 degrees Celsius for 24 hours. After firing, you drop each brick from 2 meters and count how many drops it survives. Coarse-sand bricks last an average of 2.6 drops. Fine-sand bricks survive only 1.6. When the grains are larger, they produce a more durable brick.
What makes one brick tougher than another? The size of the sand grains mixed into the clay controls how well the material holds together after firing. Two batches of bricks — one made with fine sand, one with coarse — are fired at 900 degrees Celsius for 24 hours, then dropped from 2 meters to test durability. Coarse-sand bricks survive an average of 2.6 drops while fine-sand bricks last only 1.6, showing that grain size directly determines how the brick performs under impact.
Method & Materials
You will label wooden frames, coat them with grease, mix clay, sand, and water, pour the mixture into the frames, dry the frames, separate the bricks, label them, and place them in an oven.
You will need wooden frames, clay, fine sand, coarse sand, tap water, empty pails, a chair, a measuring tape, an oven, a black marker pen, and grease.
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The results showed that the brick made from coarse sand was more durable than the brick made from fine sand. The brick made from coarse sand lasted an average of 2.6 drops while the brick made from fine sand only lasted an average of 1.6 drops.
Why do this project?
This science project is interesting because it shows how the type of sand used to make bricks can affect their durability.
Also Consider
Variations of this project could include testing different ratios of materials used to make the bricks or testing how much compression or weight the bricks are able to bear.
Full project details
Additional information and source material for this project are available below.
