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If needed I would consider extending the upper portion of the reinforcing steel over the existing end suports in effort to gain adequate shear strength without removing part of the existing wall. If necessary the steel over the supports could be "beefed up" to provide additional shear strength.

LittleInch, I am loking for something similar to the packaging "peanuts" but more durable and heavier. I thoiught maybe something existed out there these days that could be used as a drain rock or filter media for backfilling walls or used in onsite wastewater trenches. It does not have to be...

This is a detail of the particular fill situation we are currently working with. This situation appears it might have potential for a lightweight material to work as far as buoyancy. I have also been wondering if there are other materials that might be heavier and not buoyant that could be used...

I was wondering about just using the polystyrene chips, not concrete. Thanks

I am researching polystyrene aggregate for use as substitute for drain rock behind a retaining wall. Have you used this material? Where did you purchase? Cost? Any tips or thoughts on using polystyrene aggregate as drain rock substitute would be appreciated. Thanks

The referenced "undermined" blocks appear to be deteriorated or damaged? Have you noted any quality issues with the other blocks? Where is the wall located?https://files.engineering.com/getfile.aspx?folder=5923eaa7-64b5-456f-a102-983e1ab11d8d&file=Ret_Wall_Blocks.docx

Anyone know why this spec does not allow angular rock for on-site wastewater sewer drain rock? Thanks https://files.engineering.com/getfile.aspx?folder=6df8777d-65e7-4f25-9545-8e5fb9f25956&file=Sewer_Rock.docx

Any sugesstions for gradation of retaining wall drain rock backfill? See attached sketch. I am not sure about the retaining wall design assumptions, this design is by others. I am assuming the wall was designed as being in a drained condition. We are a potential aggregate supplier, have been...

TJ, Doesn't sound very good to me. Do you have any pictures? What is the material being used for?

You are corect, 25 g is the minimum sample size. See attached picture of 60 g sample for reference on particle size. I have found the smaller particles are not pratically able to be individually picked up and rolled between the fingers. The videos I have found of people running this test shows...

Interesting, thanks for the article. I imagine with a hole that size it doesnt build up enough depth to vortex. I am in Alaska, I don't think we have any of these up here butr maybe I can go visit on my way thru the northwest someday. AKSherpa

bimr, Great picture! Where is ho measured? In a submerged inlet like the one in your picture at what point does anti vortex need to be considered? Do you have any formulas or rules of thubm for anti-vortex protection? Thanks AKSherpa

KC, I think what is going on in this situation is there are no end contractions for this condition since the rectangular drop inlet does not have side walls, essentially the weir width is the same width as the channel in which case there are no end contractions. I would use the inside...

A circular standpipe does not have end contractions...

kckcei, Sorry, I wasn't real clear on what I was trying to say. The situation you are dealing with is, as you initially referenced, what I would call an inlet rather than a weir. In this situation the inlet will behave like a weir until the water reaches a certain head level, then the inlet...

KC, maybe this will help, see attached. https://files.engineering.com/getfile.aspx?folder=e3ffefab-d6cd-450d-bd10-9012afef019d&file=Stormwater_Outlets_Weir-Orifice.pdf

Anyone have experience with ASTM C142 Clay Lumps & Friable Particles test on fine aggregates? The procedure requires aggregate particles of size passing #4 and retained on #16 to be individually "squeezed and rolled between thumb and forefinger to attempt to break the particle into smaller...

Does anyone know if a well compacted dense graded asphalt concrete floor meets code for a hangar? We are working on a hovercraft hangar and the fire Marshall is questioning our plan to pave the hangar floor due to absorption and combustion issues. Thanks

Is anyone familiar with aggregate degradation or durability testing? If so are you familiar with the CL-305A shaker? I am trying to find information on what modifications are required to make the shaker meet the requirements of AASHTO T210 or for the Washington Degradation Test. Thanks

I am not looking for design. I am looking for verification that my preliminary design consisting of a double mat of rebar is the best option before I put a lot of time into something that isn't standard method. I am PE capable of doing the design just looking for tips to get me started in...