Use of H2Ri to Mitigate Pumping in Concrete Pavement Shoulder

Project Details
STATE

MO

SOURCE

RIP

START DATE

09/28/18

END DATE

01/31/19

RESEARCHERS

Xiong Zhang

SPONSORS

Missouri DOT

KEYWORDS

Concrete pavements, drainage, Fabrics, Field tests, Geosynthetics, Laboratory tests, pavement maintenance, Pumping (Pavements), Road shoulders, Test sections

Project description

Pumping is one of the major factors contributing toward concrete pavement slab failures. It is believed that drainage issues are the major cause of severe pumping and failure of PCC slabs because water and fine materials are observed to be ejected out through the joints. In recent years, a new type of wicking fabric (H2Ri) was developed by TenCate Geosynthetics to remove the excess water in the pavement structure and potentially maintain good pavement performance and longevity. By installing a layer of wicking fabric horizontally beneath the road shoulder, the excess water in the pavement structure can be absorbed from the soils, transported along the wicking fabric to the slope, and vaporized to the surrounding atmosphere which has much higher suction. A full depth shoulder replacement project at Milepost 115.9 on I-44 will be used as a field test section to test the effectiveness of the H2Ri wicking fabric in mitigating pumping of concrete shoulders. Three test sections will be constructed and instrumented. Laboratory testing will also be conducted as part of the project.
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