In the process of designing a rural aggregate surfaced roads in Alberta, Canada and noticed the that an LA abrasion test for surfacing aggregate (i.e. unpaved road) was not applicable, only required for asphalt concrete pavements and base course aggregate. Just curious why that might be the case.
The Giroud and Han 2004 uses number of axle passes and wheel load in the equaition, can wheel load be replaced with one single 9,000 lbs wheel load (ESAL =18,000 lbs)and substitute passes with ESALs for road system ? Example using 100,000 ESALs for low volume unpaved road system with a 5 year...
The Giroud and Han 2004 uses number of axle passes and wheel load in the equaition, can wheel load be replaced with one single 9,000 lbs wheel load (ESAL =18,000 lbs)and substitute passes with ESALs for road system ? Example using 100,000 ESALs for low volume unpaved road system with a 5 year...
The Giroud and Han 2004 uses number of axle passes and wheel load in the equaition, can wheel load be replaced with one single 9,000 lbs wheel load (ESAL =18,000 lbs)and substitute passes with ESALs for road system ? Example using 100,000 ESALs for low volume unpaved road system with a 5 year...
The bridge we are building is considered permanent, main haul bridge for next 20 years, probably a truck on it every 2 min.
Our current design has standard mine haul road earth berms 2m high on approaches to the bridge, the railing was to be a continuation across the structure. The bridge has a...
In the conceptual stages of designing a bridge for 797 cat haul trucks (700 ton GVW), looking to calculate an order of magnitude estimate of the force of a 797 truck travelling at 50 km/hr on a concrete barrier. In order to calculate the impact force I need to know the vehicle crush and barrier...
Trying to come up with a demolition plan for a 20 year old MSE wall with severe corrosion of internal metal straps. The wall facing is wire mesh and the wall is 13m high. Looking for some advice on sequencing of demo activities or what potential issues may arise. We were thinking of removing...
Fattdad,
The pilaster and tie back system is interesting, what would be a good reference in order to see what the system looks like. Are the pilasters tied to each other somehow? How wide are the pilasters in general? The wall is 13m high (update from original post) and 100 m long.
The wall was originally designed for 10 years but has been in service for 18 years. Another 4 years is required prior to demolition. This is why the original design was un-galvanized. The solidifying backfill idea is interesting what would that involve? I have one section of the wall that will...
Looking for any viable options to repair an aging MSE wall (20+ years old) with severe corrosion of the internal strapping. Someone suggested drilled soil nails with a shotcrete face as an option. The wall has a wire mesh facing and is about 20 m high. The wall will have to overcome large...
Unfortunately in most cases the scope of the project precludes any geotechnical investigation (small temporary bridges), which makes DRC1's comment about the drunk even more pertinent.
When making any initial sizing with Gates what would be a good rule of thumb to target final set blows/in...
I’m looking for a rule of thumb for sizing a drop hammer using the FHWA Modified Gates Formula. One suggestion is to size the hammer so that the pile reaches the desired capacity at approximately 3 to 10 blows per inch. The project I'm working on requires a pile capacity of 142 kips, with a 4000...
The sites are quite remote 1000's of KM away from nearest PDA. Gates seems to provide a reasonable alternative to ENR. I’ve noted that the capacity requirements appear to less stringent or volatile with Gates in most cases.
When I compared the factored equations ENR @ FS=3, ENR @ FS=6, and...
