doi:10.3850/978-981-08-7920-4_S3-M002-cd

ABSTRACT

The pipe heating system is a promising methodwhich can use natural energy, e.g. groundwater. In this system, groundwater is supplied to pipes embedded in pavement in order to heat roads. The system is an appropriate method for a locally iced road such as a bridge deck, because most of slip accidents in mountain roads are due to differences between normal roads and bridge decks. In an actual road using pipe heating, some pop-outs from the concrete pavement happened during suspensions of the system in winter. These pop-outs were caused by some cracks in the concrete pavement; the cracks were only in the concrete sections, including connections of the pipes. With regard to the deterioration of the concrete pavement, the authors hypothesized that the cracks were due to frost heave of leakage from the pipe connection. Fundamental experiments using a model specimen were conducted in order to verify this hypothesis. The experimental results implied cracks in the concrete pavement had been generated by pipe connections. In addition, the pop-out mechanism was reevaluated analytically by using the finite element simulation. The present paper reports the pop-out from concrete pavement with pipes, and describes experimental observations and analytical evaluations.

Keywords: Pop-out, Pipe heating, Concrete pavement, Pipe joint, Finite element simulation.

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