Pouring concrete on a steep slope?
Pouring concrete on a steep slope?
(OP)
What is the best method to pour concrete on slopes up to a 2:1 that is reinforced. This appliation would be for a liquid tight lagoon. Some as large as an acre in size. The concrete is reinforced with steel for crack control. Has anyone heard of "glacial" pouring? I have done it and Contractors like it because you just let the concrete flow down the side slope while workers are striking it off and leveling it. it keeps labor costs down. What is your opinion of this method? Thanks.





RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
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RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
We've had poor experiences with anything done from the top down.
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
The contractor is paid to do the work sticking to the standard practices, which have been used for years with proven track record. You may have succeed in using your method in the past many times, however, the owner, and potentially you/your employer, likely to bear higher chances to suffer from the poor result, because so many things could go wrong have indeed went wrong.
RE: Pouring concrete on a steep slope?
I agree with you 100%. I am on a team to change a construction specification for concrete. We currently only allow the placement from the bottom up, consistent with current industry practice. However, we are getting overwhelming request to consider this method(glacial pouring) with possible additional precautions. The main concern was the chance of having void space on the downstream end of the steel. However after testing cores from this method and methods that were pumped from the bottom up, we didn't find any substantial evidence supporting one method was better then the other. On a 2.5:1 slope, gravity will slump the concrete after placement anyways therefore having the same chance of a void. Many responded they wouldn't do it this method. Why?
What would the main concerns be with the glacial pour method vs. pouring from the bottom up?
RE: Pouring concrete on a steep slope?
Maybe you can verify it by taking samples at the toe, waist (mid height), and one at the point of concrete discharge (no rolling). I would be surprised that there is not much difference among the samples.
RE: Pouring concrete on a steep slope?
There might be more than one or ten ways to skin a cat, but we don't have problems with the sloped walls leaking.
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
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RE: Pouring concrete on a steep slope?
Always started at the top (1"-2" slump) and placed coming down the slope. I would hate to see folks having to work it from the bottom up. Gravity would not be your friend.
Usually set temp. 1" by 1" headers at grade up and down the slope to screed board (mag.stright edge) off of and control grade.
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
Rip Rap can be either stone or concrete. Most of the bridges I have been involved with have been constructed with the 4"-5" concrete with either #3's on 18" c-c or WWF.
I hate the rock Rip Rap.... simply because its really tough and dangerous to walk on.
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
http://en.wikipedia.org/wiki/Riprap
RE: Pouring concrete on a steep slope?
www.PeirceEngineering.com
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?
My feeble memory recalls that we have changed in this region to a greater percentage of projects utilizing the Stone Rip Rap because of aesthetics. I could be wrong.
The fact that it is harder to graffiti it up could be another reason.
I think in a cost comparison of the proximity of quarries, haul distance to project vs. the recent additional cost increases of ready-mix concrete may have made the Rock Rip Rap more affordable.
Again, I could be wrong.
My favorite Rip Rap (slope armoring next to waterway) was articulated block mat. Little pillows pumped full of grout that were made from a parachute type material all woven together. This was labor intensive, but it really looked nice when completed.
RE: Pouring concrete on a steep slope?
RE: Pouring concrete on a steep slope?