Concrete Proportioning - Field Experience Basis
Concrete Proportioning - Field Experience Basis
(OP)
In looking at ACI318-02, I am a bit confused with regards to an item shown in the flowchart of Figure R5.3.
The item reads:
"Field record of at least ten consecutive test results using similar materials and under similar conditions is available"
This seems odd to me.
Isn't the point of allowing a concrete facility the use of the field experience approach to give them a method that permits them to utilize their past record as long as those records are based on "similar materials and under similar conditions"? The way I read this item, it says only ten of them need to meet this criteria. What about the other five to twenty tests (based on 15 to 30 total)?
What am I missing here, folks?
Thanks in advance for any insight you can offer.
The item reads:
"Field record of at least ten consecutive test results using similar materials and under similar conditions is available"
This seems odd to me.
Isn't the point of allowing a concrete facility the use of the field experience approach to give them a method that permits them to utilize their past record as long as those records are based on "similar materials and under similar conditions"? The way I read this item, it says only ten of them need to meet this criteria. What about the other five to twenty tests (based on 15 to 30 total)?
What am I missing here, folks?
Thanks in advance for any insight you can offer.






RE: Concrete Proportioning - Field Experience Basis
RE: Concrete Proportioning - Field Experience Basis
What this means is that if you have enough historical data you can get to the point where you can calculate the standard deviation and use the criteria of Table 5.3.2.1....then you have to validate your selection of the standard deviation with an additional 10 consecutive tests. If you can validate your selection of "s" with these 10 values, then you can use that as your average strength requirement. If you can't, then you must go to table 5.3.2.2 and use the appropriate overstrength factor.
RE: Concrete Proportioning - Field Experience Basis
best Tincan