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PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

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Term of the Road Dictionary

pumping

Language : PIARC Road Dictionary / English
Theme : Operations Asset Management and Maintenance Maintenance
Definition : Phenomenon by which water entrapped at the interface between a concrete slab and its subbase layer is ejected by the deflection of slab edges as heavy vehicles pass over. Note: in some cases fines from within the pavement structure are entrained with the ejected water, which in time may result in cavities under the slab.