ACPA to Lead Visioning Session for Concrete Pavements
- Tuesday, 08 August 2017 10:34
The American Concrete Pavement Association is gathering a group of members and specifiers to envision the future of concrete pavements in the year 2040. The visioning session, called Vision 2040, will take place after the fall meeting of National Concrete Consortium meeting, on September 21 in Minneapolis.
Vision 2040 is being modeled after a similar visioning session that took place 20 years ago.
The previous initiative was called, “Creating a New Generation of Pavements,” and was initiated by ACPA in 1997. The result was five goals and a series of prioritized research and development, technology transfer, and technology implementation needs intended to help the industry reach those goals. The statements were referred to as a “blueprint,” and became the basis for the “Concrete Pavement Road Map” published in 2005. ACPA estimates about 80% of the blueprint has come to fruition and been completed over the last 20 years.
Vision 2040 will provide key stakeholders with the opportunity to look forward and revisit needs, discuss aspirations and set priorities for concrete paving. For more information about Vision 2040, contact Leif Wathne at 202.638.2272 or email@example.com.
Pavement Design Web Solution Moves Forward
- Thursday, 29 June 2017 14:59
As reported at the ACPA Mid-Year meeting, the co-branded, web-based pavement design application being developed by ACPA, the NRMCA Research Foundation, and PCA, has taken some decisive steps forward.
Development efforts led by ACPA’s Andy Gieraltowski and Eric Ferrebee have advanced to the point where many design modules are now ready for beta testing. ACPA announced the software is also on track for availability in the fall of 2017.
ACPA promoters and project partners selected the name PavementDesigner.org for the new website. When it goes live, pavement engineers, technical personnel, professors, and students will have a one-stop site to design cement-based pavement solutions. Previously, the associations sold separate windows-based design applications.
The new website will be free to use and not require software to be installed or updated.
Report Offers Insights into SPS-2 Concrete Pavements
- Friday, 10 February 2017 17:59
The Long Term Pavement Performance (LTPP) SPS-2 study, or Strategic Study of Structural Factors for Rigid Pavements, represents the most comprehensive set of concrete pavement performance data in the United States, according to a report by Larry Scofield, P.E., IGGA/ACPA. Scofield has been studying and evaluating the SPS-2 pavements, and has prepared a brief report that shows some interesting details about the pavements that comprise the LTPP test sections.
Map show states constructing SPS-2 projects (and year of construction). The pavement design features evaluated are: concrete thickness (8” and 11”); base type; flexural strength; lane width, and drainage.
Scofield reports the SPS-2 experiment consists of 12 LTPP test sections constructed in each of 14 states ranging in age from 15 to 23 years (2015), with the first project constructed in Kansas in 1992. The original experimental design for the SPS-2 experiment consisted of 192 test section, but only 120 (63%) were constructed. This will hinder future statistical analysis to some degree.
Four states constructed replicated sections of the original design, thereby producing 48 additional test sections. Of these, three states are in the wet-freeze zone and one state is in the dry-freeze zone. This resulted in a total of 168 SPS-2 test sections. In addition, 40 state supplemental sections were constructed and evaluated for a total of 208 sections.
- Of the original 144 SPS-2 core test sections constructed, 83% (119) of the test sections are still in service after 16 to 24 years of traffic.
- Of the original 40 SPS-2 State Supplemental test sections constructed, 90% of them are still in service after 16 to 24 years of traffic.
- Of all the SPS-2 test sections constructed (core and supplemental) 84% are still in service after carrying traffic for 16 to 24 years.
- The SPS-2 experiment has a higher percentage of surviving sections than any other SPS project.
- Since 84% of the SPS-2 test sections are still in service after 16 to 24 years of traffic, the experiment has outperformed all other LTPP experiments, providing evidence of concrete pavement’s long-life characteristics and the potential to sustain heavier axle loads than currently designed for.
Showcase Focuses on Two-Lift Concrete Pavements
- Friday, 10 February 2017 14:47
Showcase participants had the opportunity to visit the two-lift concrete pavement construction site. (Photo: ACPA.)
As part of the second Strategic Highway Research Program (SHRP2) program’s Project R21, a technology showcase was held on January 31 in Burbank, Calif. The focus of the showcase was two-lift concrete pavement construction, and the event drew roughly 70 people representing industry and the public sector.
As a lead state for implementation of SHRP2 R21 technologies, Caltrans, along with Federal Highway Administration, co-sponsored the showcase. The event began with a technical program featuring several agencies’ experience with two-lift concrete paving (including Caltrans, the Illinois Tollway, Minnesota DOT, Tennessee DOT, Texas DOT, and Virginia DOT), followed by a field visit to an ongoing two-lift paving project on Interstate 210 near Montrose, CA. Leif Wathne, ACPA Executive Vice President, was on hand for the event and provided insights on the technology during the discussions.
The project involves a 12-in. thick jointed-plain concrete pavement comprised of a 8-in. bottom lift and a 4-in. top lift. The bottom lift features two separate concrete mixtures, one with reduced cement content and one with recycled concrete aggregate.
About Project R21
Project R21 involves the development of design and construction guidelines for new composite pavement systems, including concrete pavements placed in two-lifts using a wet-on-wet process. Two-lift concrete pavements are said to provide significant potential benefits, including improved surface characteristics, reduced agency costs, lower energy costs, and reduced environmental impacts
ACPA to Participate in Trade Delegation Program
- Wednesday, 08 February 2017 18:28
ACPA will participate in a Special American Business Internship Training (SABIT) program on highway and roadway construction later this month.
ACPA Executive Vice President Leif Wathne will make a one-hour presentation on concrete pavements to a delegation of approximately 20 officials representing road-building interests in Azerbaijan, Georgia, Kazakhstan, Kyrgyz, Moldova, Russia, Tajikistan, Turkmenistan, and Ukraine.
This program is aimed at providing training to mid- and senior-level industry and State officials who are involved in highway and roadway construction in the Commonwealth of Independent States and Georgia.
ACPA has participated in similar programs on three occasions since 2007. In addition to being a good technology transfer opportunity, the program also allows ACPA to cite member companies involved in technology development and product sales in global markets.