Testing Grout placed in impermeable forms...

[jmims912]

5000psi grout is placed in a corrugated steel pipe section "form" embedded in the footing grade beam for tilt-up wall terminator rod embedments. As the grout placement is in an impermeable form, would it be appropriate to use impermeable cylinder mold in order to closer exemplify the field conditions? This is not non-shrink grout. It "seems" that using CMU for molding the specimen is illogical, however, I could recognize value in comparing samples to historical data in order to evaluate the grout, irregardless of its particular placement conditions.

Hmmmm???

I may be struggling to hard with logic and should just blindly follow the specs and standards...I think that's called "Stagnation", though.

 

[concretemasonry]

If you are looking at ASTM C1019, that is the procedure for masonry grout. The appropriate grout standard is ASTM C476. It does not seem your application falls within the scope of the C1019 procedure.

Masonry grout of high strengths is very rare and is often limited to prevent the use of grout stronger the the f'm of the masonry prism.

Masonry grout is intended to just bond the masonry units to the reinforcement and not to increase the strength of the wall since the codes are written with the prism strength controlling the behavior and strength of the wall. The most logical, economical and common method to increase the wall strength is to just specify higher strength block than the bare minimum. Commonly F'm is specified as 1500 psi, but it is possible to male 4500 HOLLOW prisms.

I assume someone determined the grout strength was 5000 psi, but there should have been specification for the grout which always refers to a testing standard/procedure.

Unless there is a grout specification and testing method, you are on your own justifying the results and hopefilly correlating them to some history of testing and performance.

Dick

 

[Prepakt1]

Grout in impermeable forms may give you problems. The water in grout should be allowed to bleed out.

Intrusion Prepakt /marineconcrete.com