Abstract
Shrinkage of concrete is a prime aspect affecting the durability and long-term performance of structures. IS 456 specifies the minimum cement content required to control shrinkage, which is of utmost importance in high-strength concrete (M75, M60) and lower strength concrete (M30), to be 450 kg/m³. IS456 mentions that shrinkage testing should be conducted to assess the possible decrease in volume due to moisture loss since excessive shrinkage can lead to cracking and the loss of structural integrity. However, codal provision or requirement is mentioned in the code. The literature available about shrinkage with change with fly ash is extremely limited. This study utilises a mix design approach based on the k-factor theory in which the effective water-to-cement ratio is defined as Ratio w to (c + k*f), thus ensuring optimum performance while incorporating fly ash as a partial cement replacement. The k-factor approach considers fly ash efficiency in concrete while its 28 days compressive strength is maintained equal. Drying shrinkage is measured using IS1199 and ASTMC157, and initial comparative study is presented for varying fly ash% for M15 (0,25%,45%), M35 (0,25%,35%), and M50(0,25%) concrete with effective water cement of 0.6,0.4 and 0.33.
DOI
10.5703/1288284318117
Recommended Citation
Moorvi; Gupta, Supratic; and Meera, "Drying Shrinkage Properties of Fly Ash Concrete" (2025). International Conference on Durability of Concrete Structures. 7.
https://docs.lib.purdue.edu/icdcs/2025/tmc/7
Drying Shrinkage Properties of Fly Ash Concrete
Shrinkage of concrete is a prime aspect affecting the durability and long-term performance of structures. IS 456 specifies the minimum cement content required to control shrinkage, which is of utmost importance in high-strength concrete (M75, M60) and lower strength concrete (M30), to be 450 kg/m³. IS456 mentions that shrinkage testing should be conducted to assess the possible decrease in volume due to moisture loss since excessive shrinkage can lead to cracking and the loss of structural integrity. However, codal provision or requirement is mentioned in the code. The literature available about shrinkage with change with fly ash is extremely limited. This study utilises a mix design approach based on the k-factor theory in which the effective water-to-cement ratio is defined as Ratio w to (c + k*f), thus ensuring optimum performance while incorporating fly ash as a partial cement replacement. The k-factor approach considers fly ash efficiency in concrete while its 28 days compressive strength is maintained equal. Drying shrinkage is measured using IS1199 and ASTMC157, and initial comparative study is presented for varying fly ash% for M15 (0,25%,45%), M35 (0,25%,35%), and M50(0,25%) concrete with effective water cement of 0.6,0.4 and 0.33.
