We have a downward sloping driveway and a very shallow gutter on the apron of the street.
There are lots of discussions in the forums about building concrete berms to keep water out of a garage
but generally the answers fall into three categories:
1. use a pre-formed speed bump type material.
2. use asphalt, not concrete.
3. dig a trench for a french drain.
We already have a french drain at the door entrance to the garage. For your typical rain storm, the french drain works great.
But, when we get a heavy rain, the drain is overwhelmed plus we get a tremendous amount of debris washed in from the street.
Eventually the garage floods. I cannot use asphalt because the home owner's association wants the berm to match both the
existing concrete apron on the street and our driveway. For a similar reason the have rejected any of the pre-built options
I have found online and at the home repair stores.
So I want to build a small berm at the top of the driveway where it meets the side of the street and cast this from concrete.
I have constructed a form using a cut away from an 8" concrete tube and poured a 4' concrete segment.
The berm segment is approximately 6" wide by 2.5" high. I will need a total of four segments to cover the
width of the driveway. My form includes provision for anchor bolts to hold the segment down. I plan to use
cording and concrete adhesive between segments to allow for contraction and expansion and to provide a water repellant seal.
I made my first pour this weekend using Sakrete 5000 concrete mix and while the segment came out perfectly it
broke into four sections as soon as I took it out of the mold. It appears there was no structural integrity of the segment.
So after this long winded explanation, I'm looking for guidance.
Should I use a different kind of concrete mix?
I did not add rebar; the thickness did not seem to warrant any; should I use reinforcement and if so what kind?
Should I somehow put the concrete under
compression as I do the pour?
Thanks in advance for any advice.