The nuclear gauges you discuss should only be used if you check them/calibrate them against actual cores (as ncarolinageo states), and often.
Seems lately, there are a lot of labs breaking into the asphalt business because their concrete and steel work slowed down due to economic reasons...
With respect to the method I referenced above,in my opinion, the only way to come up with the estimated diesel usage per job is to crank it out job by job. Crank it out, divide it by the CY's of SY's and stick it in spec.
I don't think a "good median" point is a number you can accurately...
I agree with LCruiser, it's not realstic to to come up with the actual fuel usage on the project, how about making an estimate of what the total fuel usage will be per CY for the specific project and list the assumption in your spec, then also tie an adjustment to a fuel price index. Use a spec...
Here is a spec Calif State DOT uses to provide adjustments for the cost of asphalt between the time of bid and time of placement. It provides adjustments for asphalt prices which vary by more than 10% of those at bid time. The constant in the equation I believe is used convert the metric...
Sorry Const2005, I didn't provide my 2 cents on your placement prices as the Caltrans unit prices you referenced were based on "in place". Without accounting for material costs or haul,and for a day with rollers,pavers, crew (not a few guys with rakes and shovels), budget $10k/day plus mob...
Caltrans average asphalt concrete prices are based on Contract Price ("in place"). They report this data on a quarterly basis. Sounds like you already found the info, if not, it can be found at:
http://www.dot.ca.gov/hq/esc/oe/costinfo.html
Just be careful if you are going to use this info...
1.0% is fine, it's not too flat, just make sure base rock is compacted tight, and it's grade is checked. If the contractor tells you that they can't pave it without birdbaths, find a different paving contractor.
Assuming you can't pave up against PCC curb/gutter pan, design an AC flowline grade at no flatter than 0.5%. If you are putting in even lifts of AC, and you have a decent contractor, you shouldn't get any birdbaths. If you design flatter than 0.5% and expect ac to be paved without birdbaths you...
Sand also plugs fairly easily. I was just involved with some test sand filters in the Tahoe basin which I also saw get completely plugged after two seasons. The test filters included 6" of sand (super clean sand spec'd for water filtration purposes, AWWA Standard B-100-00), sitting ontop of a...
That was 4 years ago, I don't recall. I think I factored in 1 to 2 additional gradesetters for 4 to 5 months, and some increased efficiencys of the earth work equipment, etc. I didn't account for the cost of installing it on the equipment. Also, once the equipment is owned, moving it from one...
Here is a web page full of the definitions your looking for.
http://www.answers.com/topic/act-of-god
Act's of god essentially mean it was not within the Contractor's control, nor yours. You state your policy is that if it's not your fault, your not giving money. As that's your policy, your...
As a PE working the constructon side of house, I have installed numerous underdrains, french drains, etc. Every plan I have seen requires filter fabric to wrap the drain rock. I have seen alot of previously installed systems fail, and also have had to replace those same systems. What I still...
I worked on a 2 mile long complete new two lane highway through rolling terrain where the contractor used sitevision by trimble, go to this website for the specifics on the system, your sure to find more than you need.
http://www.trimble.com/sitevision.shtml
The contractor had the complete...
