ACI SCC Testing case studies
ACI SCC Testing · Put your knowledge to work in context.
The Self-Consolidating Concrete Testing Technician credential is one of the ACI certification programs listed under Testing Programs, the group ACI describes as assessing "the knowledge and ability to perform, record, and report the results of concrete field/laboratory tests." Within that group it sits in the Field Concrete Testing category alongside Concrete Field Testing Technician-Grade I. It is aimed at technicians, quality-control staff, and laboratory personnel who test self-consolidating concrete, a highly flowable mix that is evaluated with methods different from those used on conventional vibrated concrete. The ACI SCC Testing case studies are 5 cases and about 1,901 words.
1Slump Flow vs. T50 Conflict on a Bridge Deck Pour
You are the field technician on a bridge deck placement using SCC from a local ready-mix supplier. The mix design specifies a slump flow target of 24 to 26 in.
392 words, about 2 min2Segregation at the Bottom of a Deep Wall Form
You are testing SCC being placed in a 14-ft-tall wall with heavy vertical reinforcement (clear spacing about 3 in.). The mix has a specified slump flow of 26 to 28 in.
384 words, about 2 min3J-Ring Blocking on a Heavily Reinforced Column
In the laboratory you are qualifying an SCC mix for a column with dense ties and a clear reinforcement spacing of 2.5 in. The slump flow is 26 in., T50 is 3 s, and VSI is 0.
380 words, about 2 min4Disputed Slump Flow Measurement at the Job Site
Two technicians measure slump flow on the same SCC sample. Technician A reports 23 in.; Technician B reports 25.5 in.
366 words, about 2 min5Laboratory Mix Qualification: Which Stability Test Governs?
You are qualifying an SCC mix in the laboratory for a drilled shaft with a 60-ft free-fall drop. The mix shows slump flow 25 in., T50 2.5 s, VSI 1, and J-Ring flow difference 1.5 in.
379 words, about 2 min