Effectiveness of vacuum saturation preconditioning regime for assessing water permeability of high performance concrete

Saturating high performance concrete (HPC) for assessing water permeability is a challenge. This paper reports a testing program established to determine the reliability and efficiency of an in situ preconditioning regime, the vacuum saturation, for the water permeability test. The vacuum saturation regime was examined through changing the parameters used and to justify if the field conditioning regime is able to yield similar results as in the laboratory, the results after vacuum saturation were statistically analysed and compared with that after incremental immersion. Its accuracy was further examined by additional experiments, whereas factors considered include different concrete mixes and different initial moisture conditions. The results suggest that the proposed method can eliminate the influence of moisture for different HPCs under the high initial moisture content. It is not effective, when the initial moisture content is low.

[1]  R. Torrent,et al.  A two-chamber vacuum cell for measuring the coefficient of permeability to air of the concrete cover on site , 1992 .

[2]  David Bloomquist,et al.  Development of a Field Permeability Test Apparatus and Method for Concrete , 1993 .

[3]  Paul Zia,et al.  EVALUATION OF NEW AIR PERMEABILITY TEST DEVICE FOR CONCRETE , 2001 .

[4]  Margaret J. Robertson,et al.  Design and Analysis of Experiments , 2006, Handbook of statistics.

[5]  E J Gannon,et al.  CONDITION EVALUATION OF CONCRETE BRIDGES RELATIVE TO REINFORCEMENT CORROSION. VOLUME 8: PROCEDURE MANUAL , 1992 .

[6]  Adrian Long,et al.  Development of a new in situ test method to measure the air permeability of high performance concretes , 2014 .

[7]  L. Parrott,et al.  Some factors influencing air permeation measurements in cover concrete , 1991 .

[8]  P. Basheer,et al.  Mechanical and durability properties of high performance concretes containing supplementary cementitious materials , 2010 .

[9]  P. A. Muhammed Basheer,et al.  16 – Permeation Analysis , 2001 .

[10]  D. Whiting,et al.  RAPID DETERMINATION OF THE CHLORIDE PERMEABILITY OF CONCRETE , 1981 .

[11]  George W. Scherer,et al.  Poromechanics analysis of a flow-through permeameter with entrapped air , 2008 .

[12]  Kai Yang,et al.  Repeatability and reliability of new air and water permeability tests for assessing the durability of high-performance concretes , 2015 .

[13]  J. Figg.  METHODS OF MEASURING THE AIR AND WATER PERMEABILITY OF CONCRETE , 1973 .

[14]  Adrian Long,et al.  Assessment of the effectiveness of the guard ring in obtaining a uni-directional flow in an in situ water permeability test , 2015 .

[15]  J H Bungey,et al.  TESTING OF CONCRETE IN STRUCTURES. 2ND EDITION , 1989 .

[16]  David Whiting,et al.  CONDITION EVALUATION OF CONCRETE BRIDGES RELATIVE TO REINFORCEMENT CORROSION. VOLUME 7: METHOD FOR FIELD MEASUREMENT OF CONCRETE PERMEABILITY , 1992 .