Rohr Elementary Students Learn About Local Construction Aggregates

Written by Alyssa Burley.

Project Cornerstone's Alyssa Burley and EnviroMINE's James DeCarolis visited two sixth grade classes at Rohr Elementary in Chula Vista on May 8, 2015.  

The sixth-grade students learned about the role construction aggregates play in their daily lives.  They also learned where the materials are mined locally in their community.

The students broke into six groups of about five students and performed a sieve analysis.  The sieve analysis requires the students to test two aggregate samples to see which one is best suited for making concrete.  The sample is poured into the sieve (a cylinder with a series of screens with varying size holes).  As the students shake the sieve, the material is separated by size.  One sample had river sand while the other had beach sand.  As expected, the students determined river sand is best suited for making concrete because it has the smallest percentage of very fine sand. 

Students also made their own batches of concrete using sand, gravel, cement and water.  Using silicone molds, the students were able to pour their concrete into various shapes like jeeps, trucks, butterflies, ladybugs, footballs and more!

The presentation, sieve analysis and concrete project are designed to support the Next Generation Science Standards.

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Sixth-grade students at Rohr Elementary performing the sieve analysis and a complete concrete project (football).