4.7 Article

Transport properties of concrete after drying-wetting regimes to elucidate the effects of moisture content, hysteresis and microcracking

Journal

CEMENT AND CONCRETE RESEARCH
Volume 98, Issue -, Pages 136-154

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2017.04.006

Keywords

Shrinkage; Microcracks; Transport properties; Durability; Hysteresis; Drying-wetting

Funding

  1. UK-China Scholarships for Excellence programme by the UK Department for Business Innovation Skills
  2. China Scholarship Council

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Drying and wetting induce a number of microstructural changes that could impact transport properties and durability of concrete structures, but their significance is not well-established. This research examines pastes, mortars and concretes with different w/b ratios, binders, aggregate sizes, curing and conditioning regimes. 50 mm thick samples were dried to equilibrium at either 105 degrees C, 50 degrees C/7% RH, 21 degrees C/33% RH or gentle stepwise at 21 degrees C/93% RH -> 3% RH, and then rewetted stepwise by humidification at 21 degrees C/33% RH -> 86% RH and full saturation to produce varying degrees of damage and moisture content. Oxygen diffusivity and permeability, electrical conductivity, microcracking, accessible and total porosity were measured at different conditioning stages over 3-year period to better understand the effects of shrinkage, hysteresis and drying-induced damage on transport properties. The effect of supplementary cementitious materials (GGBS, SF) and implications of drying wetting on concrete durability are discussed.

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