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Submitted on: 14 December 2002.
Revised on: 21 January 2003.
Accepted on: 13 March 2003.
___________________Construction and Building Materials
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Submitted on: 20 September 2000.
Revised on: 28 October 2000.
Accepted on: 17 November 2000.
___________________Construction and Building Materials
Submitted on: 05 January 1998.
Revised on: 19 March 1998.
Accepted on: 23 April 1998.
___________________Construction and Building Materials