The Cement Council of Texas has redesigned it's website for 2017. You can still find us at www.cementx.org but the site is now is easier to read and navigate, as well as being mobile and tablet friendly. We want to make this site better for you, the building professional, and make it your Texas resource for news, knowledge and events on concrete and cement pavements, infrastructure, and construction. We're celebrating by giving away valuable publications on concrete pavement and stabilized bases/subgrades for subscribers to our email updates. And you'll also be registered for a May 1st drawing for even more valuable publications from the American Concrete Institute and the Portland Cement Association.
By: Richard B. Rogers, PE
Concrete pavement overlays can be an economical method to rehabilitate both concrete and asphalt pavements (see the Guide to Concrete Overlays from the National Concrete Pavement Technology Center.) But, the concrete overlay pavement design methods being used today, yes even AASHTO ME, are overly conservative. Why should a concrete overlay of an asphalt pavement in structurally good condition be only 2 inches thinner than a new concrete pavement on a subbase and subgrade. Better methods are available--just not used--to take advantage of the existing pavement structure.
By: Richard B. Rogers, PE
Did you know that traditional pavement design methods that use 18KESAL’s will not handle the oil and gas industry super loads? Why? Because the AASHTO Axel Load Equalency Factors were developed in a study that did not include loads great enough to exceed the elastic conditions in the pavement layers. The oil and gas industry super loads have been shown to be more than double the legal load limits and can cause significant pavement distress in a single pass. Each layer of the proposed pavement design should be evaluated to ensure its elastic stress/strain limits have not been exceeded.
The Cement Council of Texas has experience in designing pavements for heavy overloads. Concrete is an ideal heavy-duty paving material. Its strength helps withstand the stress of the super loads, and it also spreads the loads over wider areas than flexible pavements. Base/subgrade stresses are significantly reduced, and premature pavement failures are averted. CCT can help state and local agencies evaluate economical road designs that actually last for their intended service lives. Give us a call.
"This blog was previously posted in the Cement Council of Texas' "Texas Cement and Concrete Blog" (now inactive) and was carried forward to the current blog ("Cementx Pavement Blog") as it contains content that may be of interest to the reader".
The Cementx Pavement Blog seeks to make pavement owners, engineers and contractors smarter about selecting, designing, constructing and maintaining pavements. New blog postings began February 1, 2017; however, we carried over pavement-related blog postings from our older blog, the "Texas Cement and Concrete Blog," which ran until December 2016.