An issue has come up a few times now which has really bugged me. Whenever a road has on-street parking, it appears that cars parked on the street are within the departure sight distance triangles (per AASHTO). For example, on a project that I'm working on with a 40 mph design speed, if you plot...
We proposed this on one of my plans and the City I'm working for is concerned that the slurry seal won't bond to the ARHM like it would on a typical ACP. I've never heard of this concern and was wondering if anyone on this forum has any opinion on this.
Thanks!
I am a roadway designer and typically write specifications using the Greenbook. I recently had a construction manager reject a concrete pavement submittal because he thought the w/c of 0.57 was too high (even though the concrete compressive strength and slump was met) and recommended that it be...
I typically estimate asphalt concrete pavement in tons by using the formula [Tons = Cubic Feet of material x Density of ACP (148 lbs/cf) / 2000]. I need to estimate asphalt rubber hot mix in tons and am trying to find out if it's density is still around 148 lbs / cf. Anyone know?
I have been the roadway designer on multiple roadway widening project for various cities. I have had a few cities request that we provide a 2 foot wide and 2" thick cold mill and overlay adjacent to the saw cut line which is typically 1' from the edge of gutter. I have also seen this on utility...
I am writing the Special Provisions (to modify the Greenbook 2009) for a road widening project in using the format where you reference the specific section and indicate how to modify it like [replace the first paragraph with the following] or [Add the following] like the example below.
SECTION...
I have prepared plans for a street rehab of an existing street where the existing street grades are over 5% in some areas. This project includes sidewalk replacement and the contractor is saying that he can't build a sidewalk with a slope greater than 5% because it is against the ADA (CBC in...
I work on a lot of roadway widening / rehabilition projects for various cities. I alway have a difficult time estimating how long the construction schedule should take. Mostly I estimate it by using previous projects but I don't have any back up to support my duration. Does anyone know of a book...
How can the controller of an existing 8-phase operating intersection be modified to accommodate an exclusive “scramble” phase? Since all eight phases are currently being used, would the scramble phase require an additional (9th) phase or can this be accommodated with the existing Type 170...
I have a situation where I need to design a curb ramp and if I used a 8.3% maximum grade, the curb ramp would never daylight because the adjacent road is at 10%. In situations like this, what is maximum length I should make the ramp? I thought I saw an ADA guideline once which stated to use 10'...
I am working on road rehab project where several ramps need to be replaced to conform to ADA standards. There are a few ramps where existing traffic signals would be within the side slope portion of the new ramp. I have seen traffic signal bases modified with ramps before.
(see attached picture...
Typically on all grind and overlay projects (where the existing and proposed finished surface is at the same elevations), I have always specified for all manholes and valves to be adjusted to grade without giving it a second thought. This is usually at the direction of the City I am working for...
I have slurry seal (type II) as a bid item for one of my roadway projects and need to know how to convert my SF quanity to ELT (extra large ton) because that's how the agency wants it. Does anyone know how to do this?
Thanks,
Raydefan
When designing a pavement overlay, What are the advantages/disadvantages of ACP versus ARHM? From my experience, the geotechs have said that structurally there are no differences. Are there situations where one is prefered over the other?
I have two quick pavement related questions.
1. When using a leveling course on an overlay project in order to increase the crown slope, can you place this leveling course directly on the existing surface (on top of tack coat) or should you coldmill an inch or so?
2. Do you still place a tack...
We are trying to locate some storm drain and sewer lines in a retail site that we have no as built plans for. All we have are the above ground catch basins and manholes that we can use to assume some type of alignments. We potholed some locations we thought we would find these pipes, but they...
I work on a lot of public works roadway widening projects and need to learn more about dry utilities to help me know the impact of relocating things like cable line, transformers, electrical vaults, etc. Sometimes, I can't even identify what a particular above ground dry utility is and who owns...
I am a civil engineering working on a roadway rehabilitation project where we are coldmilling and overlaying 2" of pavement. We also need to indicate locations for digouts where there would be a full pavement section for areas that the coldmill/overlay wouldn't repair the pavement. My question...
I am a civil engineer working on an onsite private fire water system for a hotel/resort site. My experience with fire water systems only includes off site systems which would include public fire hydrants and connection lines for a building’s sprinkler system, so I am trying to design this...
I am a civil engineer working on an onsite private fire water system for a hotel/resort site. My experience with fire water systems only includes off site systems which would include public fire hydrants and connection lines for a building’s sprinkler system, so I am trying to design this...
