Low strength concrete results refers to strength failures in relation to the specified design strength. It is common for this to occur 1 to 2 times for every 100 tests done. Some causes for low strength concrete might be: Test specimens improperly handled, cured, and tested by unqualified individuals, jobsite addition of water, wrong mix is placed due to error during ordering or improper batching. Below are some ways to reduce the likelihood of such problems:

-Only permit field testing by qualified ACI certified individuals

-Ensure proper facilities for test specimens prior to placement. Curing box should maintain temps between 15-25C

-Review concrete delivery tickets for all loads and compare to specifications