Hi Bob,<div><br></div><div>I asked Public Works Director Addison to provide me with an answer to your questions, and also to answer a question of mine - are the street(s) you mention wearing more than is expected given the time the were repaved? I've pasted his answer in below (quick summary: several AASHTO and ASTM standards, and the street is wearing more than it should be, but probably not because of improper construction/repaving).</div>
<div><br></div><div>Please let me know if you need more detail about the standards.</div><div><br></div><div>Alan</div><div>(Ward 2 Town Council Rep & Public Works Committee Member)<br><br><blockquote class="gmail_quote" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<span style="letter-spacing:0px">Prince George’s County uses Maryland State Highways Administration’s (MSHA) standards and specifications (which includes AASHTO and ASTM) for roadway construction and/or replacement. </span><br>
<span style="letter-spacing:0px">The street in question was last resurfaced in 2002 therefore it’s not uncommon that the roadway (a high traffic volume street) would be showing signs of stress. </span><br><span style="letter-spacing:0px">The street is experiencing surface wear known as pavement rutting, which is caused for one of three reasons: </span><ul style>
<li style="margin-left:0px;margin-top:0px;margin-right:0px;margin-bottom:0px;font-family:Helvetica;font-size:12px"><span style="letter-spacing:0px">Insufficient compaction of hot mix asphalt (HMA) when it was initially installed and the HMA pavement continue to densify from heavy traffic loads, </span></li>
</ul><ul style><li style="margin-left:0px;margin-top:0px;margin-right:0px;margin-bottom:9px;font-family:Helvetica;font-size:12px"><span style="letter-spacing:0px">Improper mix design or manufacture (e.g., excessively high asphalt content, excessive mineral filler, insufficient amount of angular aggregate particles) or</span></li>
</ul><ul style><li style="margin-left:0px;margin-top:0px;margin-right:0px;margin-bottom:0px;font-family:Helvetica;font-size:12px"><span style="letter-spacing:0px">Subgrading rutting (sub-base failure)</span></li></ul><br>
<span style="letter-spacing:0px">Considering how long it has been since we have made major repairs to this section of street I believe what we are experiencing are signs of base failure. To correct the problem we may have to excavate down to the subbase, repair any problems found there, then install the asphalt cross-section (compacting in lifts per MSHA standards).</span><br>
<span style="letter-spacing:0px">Is it possible that the contractor did not properly installed the roadway or the roadway was not designed properly? It is possible, however if that was the case we would have experienced the previously mentioned problems a lot sooner.</span></blockquote>
<div style><span style="letter-spacing:0px"></span></div><div style><span style="letter-spacing:0px"></span></div><div style><span style="letter-spacing:0px"></span></div><div style><span style="letter-spacing:0px"></span></div>
<br><div class="gmail_quote">On Mon, Feb 27, 2012 at 4:44 AM, bob smith <span dir="ltr"><<a href="mailto:sfmc68@verizon.net">sfmc68@verizon.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Bear with me please, I am questions for a specific reason<br>
Does anyone on this list know the actual standards used to<br>
reconstruct the town streets?<br>
<br>
Please do not tell me to look at such and such source of<br>
information.<br>
A number of streets were reconstructed a couple of years ago.<br>
<br>
If you look closely, especially during rain storms, you will perhaps<br>
notice some ruts beginning to appear on SOME of the streets<br>
especially Riverdale Road. One simple example is Riverdale and<br>
Taylor, East bound at the stop sign.<br>
<br>
There is a standard used for calculating the requirements for<br>
streets and it is based on traffic load. One term used is ESAL,<br>
or Equivalent Single Axle Load. Cars represent a much lighter<br>
weight/mass load on the road than buses, trucks, multi axle<br>
trucks, even fire trucks.<br>
<br>
I am interested in learning if anyone on this list does actually<br>
know the standard used.<br>
<br>
thank you/<span class="HOEnZb"><font color="#888888"><br>
bob smith<br>
<br>
-- <br>
We'll see said the zen master<br>
<br>
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