Analyses of Frost‐Migration under Post‐Tensioned Slabs

Overton, Daniel D.; Nelson, John D.; Chao, Kuo‐Chieh

doi:doi:10.1061/41072(359)14

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Proceedings / Volume 359 / Issue 41072 / FROST ACTION

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Analyses of Frost‐Migration under Post‐Tensioned Slabs

ASCE Conf. Proc. doi:http://dx.doi.org/10.1061/41072(359)14

Cold Regions Engineering 2009: Cold Regions Impacts on Research, Design, and Construction

Proceedings of the 14th Conference on Cold Regions Engineering

Daniel D. Overton, P.E. F. ASCE¹, John D. Nelson, Ph.D., P.E. F. ASCE¹, and Kuo‐Chieh Chao, Ph.D., P.E. M. ASCE²

¹Principal Geotechnical Engineer, Engineering Analytics, Inc., 1600 Specht Point Road, Suite 209, Fort Collins, Colorado 80525.
²Senior Geotechnical Engineer, Engineering Analytics, Inc., 1600 Specht Point Road, Suite 209, Fort Collins, Colorado 80525.

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Abstract

Post‐Tensioned slabs‐on‐grade were used for the foundations of a condominiums development in the mountains of Colorado near Silverthorne. The site is located near the Blue River and has a high water table and silty soils. Because an unheated patio was cast as an integral part of the post‐tensioned slab, the edges of the slab experienced intolerable heave due to frost penetration under the patio. The migration of the freezing front and the resulting frost heave were modeled using commercial software. The design defects that led to the frost penetration were identified using the results of the analyses. The results also provided input into the design of remediation plans.