I recently learned that the largest cement manufacturer in my state (Florida) is now producing only C595 cement. This has been coming for a while, but only in the past six months has it become an issue.
Has there been any discussion of this on this thread? I don't recall seeing it.
What, if...
I am looking at a report on parking lots for a client with about fifty school facilities done by another engineering firm. The report contains a repair forecast.
The report has most of the parking lots to be resurfaced within the next few years. The resurfacing is to consist of milling 1.5"...
I'm writing a concrete pipe spec and am planning on including the following language.
I would like opinions on whether the specification is too stringent or too lax. Any comments would be appreciated on this topic and also concerning the clarity of the spec.
"One hundred percent of all...
I am working on a file in AutoCAD 2012.
When I use the VP Color control to change the line colors in the viewports, it works for some layers but not for others.
I am trying to change a layer display in viewport from Blue to Grey9.
It has worked for all layers but one.
All lines are polylines and...
I am a civil engineer reviewing an assessment report concerning a multi-building facility.
They have a photo of the main switchboard with the label reading Main 3,000 amps, 3 pole, 120/208 volt.
The report then makes the following calculation, which I believe is wrong:
The calculation they have...
I am reviewing a drainage assessment report in which the following statement is made.
"Larger pipes are able to self-clean due to their ability to achieve a minimum cleansing velocity of 2.5 feet per second based on the engineering principals (sic) behind storm drain design."
It seems to me that...
We have a concrete problem and are getting a materials testing company to evaluate the issue.
I would like to get some opinions on what is causing the problem.
The concrete was poured about 4 weeks ago and appears to have not cured yet.
The attached picture shows the area, which is the...
I am looking for different opinions on the material and thickness (pressure class) used for water mains and sewer force mains. There is usually a local utility standard that I have to meet, but in this case the local utility has no established standards.
In the absence of any local standard or...
We have an office argument going about the use of ball valves versus gate valves on a sewer force main. This particular project is a 12" force main running about 2.5 miles and discharging into a manhole, but I would like your opinions on sewer force main valving in general. The project is...
We are working on a project in north Florida where an existing 18" storm pipe has to be diverted about 10' to go underneath a proposed pedestrian tunnel.
The standard approach of using a two or more smaller pipes to carry flow does not seem to apply, as there will be many days or weeks during...
I am working in Microstation V8.
Occasionally when I add a layer, the lines on that layer show up on screen as thin white lines instead of the color and line weight I want.
The lines plot at the correct weight in B&W, but show up thin and white on screen.
This only happens sometimes.
Any...
We have a project on which we are adding turn lanes to an existing two lane, 25-mph, residential roadway. The existing roadway is less than 5 years old and in good shape. We called out for the entire section of roadway to be milled and resurfaced so that the interface between the new lane and...
My company is working on a project in North Florida on which we have to relocate several utilities. I know about the sewer, water, etc., but have not worked on a natural gas line before. My question is what standards are used, what materials and fittings are used, how do you avoid conflicts...
I am trying to come up with a rough seepage estimate for a wet detention pond in which the design normal water level is about 1.5 feet below the groundwater level.
The site is mostly clayey sand.
I used to have a correlation between fines content and permeability, but I just moved offices...
I hear contractors talking about bringing in "hardpan" fill or hitting "hardpan" at a site. Other than being firm material, does anyone know what properties (soil type, etc.) the term hardpan refers to? It seems to have no particular meaning, being applied to clays, clayey sands, clean sands...
Does anyone know of any correlation between the Limerock Bearing Ratio and the California Bearing Ratio? We use LBR here and most textbooks, research, etc. only discuss CBR, I assume because LBRs are only used locally. I have been using a rough correlation of 100% LBR=80% CBR. As far as I...
Our clients, an architect and a structural engineer, are complaining about our recommendation for a 98 percent Modified Proctor dry density in the last foot underneath the floor slab-on-grade for an addition to a high school. It is a 150 psf slab, with no extraordinary criteria. The soils are...
I was called onto a project with no geotechnical engineer or exploration. The project is a one-story wood frame restaurant built on a pond in up to 15 feet of water. The contractor jetted 40 foot timber piles and then got nervous and called for an exploration, which was completed last week...
I just became involved with a renovation project. The existing structure is two-story masonry on shallow footings. An elevator is to be added to the side of the existing building. Originally, the elevator pit and walls were to rest on a mat bearing three feet below adjacent grade. The...
I use N-values to estimate settlement in shallow foundations in sand by correlating N with soil moduli. I use a linear relationship, higher N=higher Es. The approach is somewhat conservative, but it is as accurate as any cheap method to my knowledge. My problem is that often I am estimating...
