Core Research

Fall 2017

ICPI Foundation nears $1M in total grants

by David R. Smith

By

Core Research

Established in 2000, the ICPI Foundation for Education & Research provides funding to address key research questions enabling manufacturers, designers and contractors to make, design, build and maintain better segmental concrete pavements. The updates to follow demonstrate a wide range of projects and studies the Foundation supports.

Landscape Architecture Foundation Performance Series Case Studies

The LA Foundation has assembled a tremendous collection of case studies documenting economic, environmental and social performance of specific projects and landscape systems. This information is important to an increasing number of practicing landscape architects who use performance metrics on various landscape systems for clients. One of those systems evaluated in various high-profile landscape architecture projects is segmental concrete pavements. An ICPI-curated collection of concrete paver projects published by the LA Foundation can be found at www.landscapeperformance.org/collections/segmental-pavement. Check this site in the coming months for a learning module on performance of segmental concrete paving. This presentation reviews tools to measure economic, environmental and societal performance benefits of segmental concrete paving.

Full-scale Load Testing of Paving Slabs and Planks

Modeled truckloads on slabs and planks will be validated with full-scale load testing.

An increasing number of companies are manufacturing, designing and installing paving slabs and planks. While these products can take a modest amount of vehicular traffic, a core question for the industry and designers is how much? To help answer this question, the ICPI Foundation funded finite-element computer modeling in 2015 that simulated truck tire loads on a range of paving slabs and planks on various bases and subgrade strengths. This resulted in draft structural design tables and procedures now under review by the ICPI Technical Committee for use by the industry and designers. To support this review, the Foundation funded validation of selected slab and plank shapes, base materials and thicknesses. Construction of a test area occurred at the end of June that will receive a significant number of heavy truckloads. With a start date later this summer, this full-scale load testing will likely take two years.

PICP Life Cycle Cost Analyses (LCCA), Tools and Training

This project includes developing an LCCA Excel tool that compares costs of permeable interlocking concrete pavement (PICP) to interlocking concrete pavement (ICP), as well as to conventional asphalt and concrete pavements. The tool is accompanied by a report that provides rationale on accounting for costs and benefits not directly related to PICP. Among several benefits, these can include land not used for detention ponds and reduced expenses to process stormwater and sanitary sewage from older combined sewer systems. When offsite savings are counted over decades, PICP can be less expensive than conventional pavements. Managed by Applied Research Associates, Inc., the project also includes a survey of selected PICP projects, conducting LCCAs and reporting on influencing costs and monetized benefits. Applied Research Associates will also conduct ICPI training sessions in the use of the LCCA tool.

Winter Operational and Maintenance Best Management Practices (BMPs) for Permeable Interlocking Concrete Pavers

The ICPI Foundation is leveraging about half a million dollars invested in PICP research conducted over the past few years by the Wisconsin DNR.

Construction of PICP test areas is anticipated in August 2017 at the Toronto and Region Conservation Authority in Vaughan, Ontario, Canada. Construction of the test area will be by ICPI member Ross Yantzi’s Pavestone Plus. This project evaluates the effectiveness of different cleaning equipment and winter deicer use compared to conventional pavement. Matching contributions from the ICPI Foundation and members will be from Canada’s Natural Sciences and Engineering Research Council. Oaks Concrete Products is donating permeable pavers and Lafarge is donating ready-mix concrete and aggregates for the PICP. The project will help address the primary PICP question: maintenance practices and cleaning equipment effectiveness. Results will amend ICPI Tech Spec 23 on PICP maintenance available on www.icpi.org.

Sidewalk Surface Smoothness Evaluation

Pathvu, Inc. (www.pathvu.com) will measure and determine the roughness index for 15 ICP and 15 PICP sites each in three cities. Sites have been identified in Pittsburgh, Philadelphia and Washington, D.C. Roughness data will be compared to roughness criteria from the U.S. Access Board originally developed by the University of Pittsburgh. Pathway roughness measurements are taken in anticipation of advisory material on wheelchair-pavement interaction being published by the U.S. Access Board in the next few years. The data should better position the industry by using the ASTM E3028 test method which will likely be referenced by the U.S. Access Board.

Wisconsin Department of Natural Resources

This grant supports two years of laboratory water quality analyses of outflows from a full-scale PICP no-infiltration design that has been previously monitored for several years, supported by ICPI members and Foundation contributors. The research fills the need for pollutant-reduction data on no-infiltration PICP designs. Located in a parking lot in Madison, WI, favorable pollutant reductions can qualify for credits mandated by the DNR. The industry is seeing wider use of no-infiltration PICP directly next to building foundations, over extremely weak subgrades and over high bedrock.

Road Map for Permeable Pavements

The ICPI Foundation, the National Ready Mixed Concrete Association and the National Asphalt Pavement Association collectively funded an invitation-only national conference November 14-15, 2017, organized by and located at the University of California at Davis. The deliverables will provide ways to overcome institutional barriers to wider acceptance of permeable pavements by stormwater agencies, municipal and state road departments and civil engineers.

Howard Road near Modesto, CA, will be systematically monitored for three years to determine how well it survives continuous truck traffic.

Interlocking Concrete Pavement Road Monitoring

This magzine’s Winter 2016 cover story reviewed mile-long Howard Road in Westley, CA. The unique aspect of this road is the heavy truck traffic. The ICPI Foundation funded three years of condition surveys per ASTM E2840, plus falling weight deflectometer testing to estimate its structural capacity and remaining life. The road’s owner, the Stanislaus County Public Works Department, will share the cost of the monitoring study to be conducted by Applied Research Associates, Inc. The outcome of this study will likely influence the use of ICP on other roads.

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