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Accelerating the thaumasite form of sulfate attack and an investigation of its effects on skin friction

Brueckner, Rene (2008)
Ph.D. thesis, University of Birmingham.

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Abstract

The objective of the research was to accelerate the thaumasite form of sulfate attack (TSA) under laboratory conditions in order to identify its effects on skin friction at the soil/concrete interface. The experimental programme was organised into five series which investigated the formation of TSA under unrestrained and restrained conditions whereby the acceleration of TSA was observed at unrestrained conditions depending on water-cement ratio, cement content, casting face and aggressive solution. Restrained conditions simulated soil/concrete interface interactions and were applied to identify changes of the skin friction affected by the formation of thaumasite. TSA was successfully accelerated and a linear deterioration progress was monitored using a developed needle test method. Using clay-restrained conditions thaumasite formed attached to the concrete and favoured a more severe deterioration culminating in thaumasite layers of up to 25mm depending on interface pH and applied pressure. Thaumasite at the interface did not decrease the shear strength including skin friction and cohesion. Therefore it was concluded that TSA occurring at piles or foundation bases does not affect the stability of the superstructure regarding loss of friction and settlements, however, continuous loss of concrete can increase the slenderness and cause premature corrosion.

Type of Work:Ph.D. thesis.
Supervisor(s):Williamson, Sarah Joanne and Clark, L. A. (Leslie Arthur) (1944-)
School/Faculty:Schools (1998 to 2008) > School of Engineering
Department:Civil Engineering
Keywords:Sulfate attack, thaumasite, skin friction, acceleration, shear test
Subjects:TA Engineering (General). Civil engineering (General)
Institution:University of Birmingham
ID Code:176
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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