concrete sampling

[cvlenv]

goog day...
could anyone advise if it is required by existing standards(say ASTM), to get beam samples (and of course, testing) for reinforced concrete walls?..if so, what could be the possible mode of test? one-point? two-point? three-point? what could be our basis if test results are passing?
thank you very much, in advance, for any advise and pointers you could provide...

 

[BigH]

ASTM wouldn't "require" beam testing - ACI might or the project specifications. ASTM has traditionally been tasked with developing standard tests and standard acceptance based on the materials - although, sadly, they appear to be trying to but into the "code of practice". ASTM does have methods on how to collect the concrete, cast the beams and test the beams. We had some shotcrete beams tested and it was a one point loading - the ASTM standard had, of course, the location of the support to the beam and specimen size, etc. I'll try to find the proper standards for you in a little while - unless others chime in before.

 

[cvlenv]

thanks BigH...

actually, i was wondering if it was requirement since the retaining wall is subjected to flexural loads due to the water or earth it resists...

although, theoretically, we could convert the compressive test result to corresponding flexural or moment capacity by some formula we learned in college...but i just want to know if some books or standards, you know of, thus require such "beam-capacity test"

 

[hokie66]

Retaining walls wouldn't normally depend on concrete flexural strength. The reinforcement takes the tension, and the concrete takes the compression. Flexural strength would be more important for something like a rigid pavement.

 

[BigH]

. . . and shotcrete for rock support.

 

[cvlenv]

thank you hokie66 and BigH...

one thing more, could you advise if you know of some chapter or section of the ACI or ASTM that state the provision for such concrete testing?

on other matters, i am researching on non-destructive method in compressive capacity test... is the reading on the rebound hammer corresponds to the compressive capacity of the concrete structural member or is it a sort of "index" number and be multiplied to a factor to be able to get the actual compressive capacity?...

thank you again and good day to all...

 

[BigH]

Please search the site for "Schmidt Hammer" or "Rebound" - the topic of the rebound hammer has been discussed in detail in a number of other threads.

For beam testing - try ASTM C1018 (Std Test Method for Flexural Toughness and First-Crack Strength of Fiber-Reinforced Concrete (Using Beam with Third-Point Loading). ASTM C42 (Std Test Mthod for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete).

 

[cvlenv]

thank you BigH...

good day...