Unrestrained Curling in Concrete with Fine Lightweight Aggregates

Curling of concrete pavements and slabs because of moisture gradients has been documented for many years. Over the past 20 years, significant research has demonstrated the benefits of adding saturated lightweight aggregate fines to concrete to enhance hydration, reduce permeability, and increase strength. This study extends the current research by examining the effect fine lightweight aggregate has on concrete curling behavior. A total of 15 different mix designs were systematically tested following a design of experiments model. The three independent variables were water-to-cementitious ratio, volumetric replacement of fine aggregate with saturated fine lightweight aggregate, and moist curing duration. The addition of saturated fine lightweight aggregates reduced the magnitude of moisture curling in a concrete specimen when compared with an identical mixture without saturated fine lightweight aggregates. In addition, curing duration had an inverse effect on the moisture curling, i.e., the longer curing duration, the higher amount of concrete curling, although a higher concrete strength was achieved. An increase in the water:cement ratio also led to higher curling values within the studied range. Overall, the results indicate that the addition of saturated fine lightweight aggregates has a positive impact on reducing the curling magnitude and drying shrinkage of paving concrete mixtures.

Language

  • English

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Filing Info

  • Accession Number: 01633010
  • Record Type: Publication
  • Files: TRIS, ASCE
  • Created Date: Apr 28 2017 10:40AM