Fifth-graders At Central Elementary Perform Sieve Analysis on Construction Aggregate Samples and Make Concrete in the Classroom

Written by Alyssa Burley.

Over two days (May 5th and 12th) Project Cornerstone's Alyssa Burley and Crystal Howard, EnviroMINE's James DeCarolis, and volunteer Barbara took turns visiting five fifth-grade classes at Central Elementary in San Diego, CA.  Students learned about the importance of construction aggregates (i.e., sand, gravel and crushed stone). 

Fifth-grade students   at Central Elementary finishing the math portion of the sieve analysis.

Fifth-grade students at Central Elementary finishing the math portion of the sieve analysis.

After a short presentation, students were asked to look at two samples of construction aggregates (one with river sand and one with beach sand) and develop a hypothesis for the sample they thought would be best suited for making concrete.  The students tested their hypothesis by performing a sieve analysis.  The sieve analysis allows the students to separate the materials by size using a series of screens. The students weighed the contents captured on each screen.  The sample with the least amount of very fine sand is best for making concrete.  As expected, the students found river sand to be best for making concrete.

Using information learned during the presentation, students mixed their own concrete being careful to follow the recipe in order to keep the correct portions of sand, crushed stone, recycled aggregate, cement and water.

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

Science Trek: The Next Generation Conference

Written by Alyssa Burley.

On Saturday, February 28, 2015, nearly 500 educators attended the Science Trek: The Next Generation Conference at Grossmont College in El Cajon.

The event brought science educators and administrators together to discuss the Next Generation Science Standards (NGSS) and parts of the Common Core standards that are focused on science.

Project Cornerstone reached many science educators.  Forty three teachers who visited the booth, requested information about having Project Cornerstone visit their classrooms.

The event was sponsored by the San Diego Science Educators Association (SDSEA) and its co-sponsors, San Diego Unified School District, San Diego County Office of Education, the San Diego Science Alliance, and Grossmont College.

Project Cornerstone booth in the exhibition area.

Project Cornerstone booth in the exhibition area.

Welcome screen at the conference.

Welcome screen at the conference.

Samples of aggregates, concrete and asphalt.

Samples of aggregates, concrete and asphalt.

Photos by Alyssa Burley