I'm not much of a hydraulics guy, but I do have a mech degree and I practice a bit in piping.
A client asked if we could provide services/plans to convert a box culvert (old, wooden, bad condition during inspection) to a series of circular CMP culverts. In lieu of a more complete study of the...
I've been tasked with estimating the remaining time to required repairs for a tubular corrugated steel structure with a potash/mining muck backfill and traffic over the backfill. The tube was placed in a mining drift and the perpendicular drift above has the traffic.
The side of the tubes are...
Thanks for your response EdStainless
I utilized the nickel institute documents and website for my cursory research. I can confirm MTI-global requires a membership to view their documents. If they have anything definitive on caustic/acid cocktail and you're willing to share, please do so...
I've been asked to select materials in the bid stage for a chemical processing facility. We do tanks, but typically the material selection for our tanks is one step up the engineering chain.
I've performed some cursory research, and I have some undergraduate-level training in material...
That is fascinating masonrygeek! I'll dig into those standards.
phamENG, I agree testing the system is ideal. I'll see if that's possible for this project.
EdStainless, yes it's a highly corrosive process. I've found there's a loose correlation between chloride content and compressive...
Thank you for your response dhengr and MotorCity,
In this case, I think there's strong evidence for chlorides. The wall is at a Canadian potash mine. There are chloride stalactites on the surface of the wall (image attached). The stalactite is on the left
hand side of the image. There's...
Thanks for your feedback MotorCity. I agree, this is likely a replacement project. I'm planning to perform a strength calculation, but need to test for the compressive strength side of the equations. Any feedback on the diameter of the cores? Have you done it previously?
I've been asked to assess a degraded CMU wall, and it looks as though it's in poor condition. I can see into the cells in a handful of locations, so that gives you an idea of the condition. The site is subject to high chlorides, and I suspect chlorides are culpable for the degradation. I'm...
I've opted to back calculate the maximum allowable simply-simply supported beam angle (at the tips) considering a simply supported beam based on the Annex D requirements for the least onerous (L/180) requirements. I trust (viewers) you'll agree this is a tip slope of 1.019-degrees...
I've worked on several jib crane structures and although the Canadian design guide for cranes (Crane Supporting Steel Structures) recommends a deflection limit of L/225, I've reverse engineered several "manufactured" jib cranes and I've landed on L/150 as a deflection limit for unpowered...
Thank you for your replies.
I read through the following academic research article. It was hugely informative, and summarizes the extent of FRP testing at high temperatures completed to date. Several of the referenced papers are from the 2018 to 2020 range, so relatively current as well...
I was recently approached by a client in the mining industry for some testing on FRP grating. The problem is this: the manufacturer of the FRP product guarantees the product will go to 70C without structural degradation. The grating would potentially be subjected to product with temperatures...
Enable, I didn't realize you were in Canada, eh. The linked article referred to Florida and California. I just noticed the reference to the Canadian jurisdiction.
With the exception of floor finishes and keeping radon out of conditioned spaces (residences or otherwise), what benefits do...
Thank you all for your replies.
Thanks for the heads up geotechguy1. Considering the arrangement, I don't think piping will be an issue. The sand is deep and well confined.
Enable, we have a different climate and standard practices that we work with in Canada. There are no T.O. concrete...
Thanks for your replies.
SRE, I've attached a cross section of the arrangement with the slab. Grey = existing soil, Red = granular fill, Green = a thin sand layer, and the black dots are the potential drain tile locations. Granular fill is 28" and concrete is 15". The water table is...
Thanks for your replies!
kingnero and XR250, the concrete goes directly on the sand immediately following a wetting of the sand. The goal for curing is equalizing moisture migration from the top and bottom of the slab. The wetted sand helps equalize the moisture loss from the top and bottom...
I'm working on a project for a mat foundation under train rails for some rail equipment. The area we've excavated is traditionally wet, and we specifically designed a drainage system that would mitigate the typically wet surface. I've attached an image with a depiction of our proposed weeping...
Thanks for your reply NOLAscience!
The contractor has offered to lift and rechair the bars with a telehandler and another palette of bricks. I'm planning to review again shortly following their rework.
The mat is for rail traffic. Localized bearing pressure considering the thickness of the...
I've specified a thin layer (2") of sand directly under concrete for several slab-on-grade projects per a professional development course I participated in a few years ago. As I understand it, wetting the sand prior to concrete placement helps mitigate warping of thinner slabs during curing by...
