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Micropile Grout Compressive Strength
As a contractor we typically try to mix for the "thickest" grout possible to not have to worry about variability of grout breaks. Unfortunately, I am finding it difficult to prove to FHWA that it is a testing issue and not representative of the material installed. Additionally, I think the...- Aspensnow
- Post #9
- Forum: Foundation engineering
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Micropile Grout Compressive Strength
Yes after further investigation, I believe the results indicate some sort of mis-curing of the cubes. Additionally, we were using a water reducer which means we should have followed ASTM C942 and not C109, which deals with confining the cubes during curing and breaking to represent the in-place...- Aspensnow
- Post #8
- Forum: Foundation engineering
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Micropile Grout Compressive Strength
I did not watch the samplers in the lab, but this is my thought exactly. I have samples broke at a 6100 psi average (3 cubes) and FHWA broke there 28 day cube at 3500 psi. To me this has to be a handling issue as all samples were broken lower (except 1) than the 3rd party testing agency. I have...- Aspensnow
- Post #5
- Forum: Foundation engineering
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Micropile Grout Compressive Strength
The micropiles are 55ft hollowbar with casing in the top 15ft. They rely mostly on the grout ground bond for compressive strength with some minimal tensile strength. There are also some lateral components hence the casing in the top 15 ft. The 10% of the piles have been proof tested and passed...- Aspensnow
- Post #4
- Forum: Foundation engineering
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Micropile Grout Compressive Strength
Recently received grout compressive strengths back with 28 day data all over the place. Design was for 4500 psi and breaks are from 3500-6500psi. I have both flow test and mud balance data as well that do not align with test results. Additionally, multiple days where grout compressive strengths...- Aspensnow
- Thread
- Replies: 8
- Forum: Foundation engineering
