Long-term Shrinkage Empirical Model of High Performance Concrete in Humid Tropical Weather

Abstract

This paper represents a long-term shrinkage empirical model of high performance concrete (HPC) with and without fly ash based on experimental research in which compressive strength was 60MPa. Specimens measuring 150x150x600 mm³ were used. Observations were conducted over the two year periode using an  embeded vibrating wire strain gauge. As a result, the empirical model was  in agreement with experimental results.  Addicionally comparisons were made with ACI 209R, AS 3600-2009 and Eurocode 2. The results showed that ACI 209R was about 60% and 75% of HPC with and without fly ash respectively.  Eurocode 2 was underestimated for both HPC (58%) and HPC without fly ash (73%). AS 3600-2009 was 16% higher than HPC with fly ash but this condition is suspectable to change during longer observation periode because AS 3600-2900 has a lower slope than the empirical model, while HPC without fly ash was overestimated (93%).  Model representation shows  significant differences in form compared to ACI 209R; and AS 3600, and similarity in form compared to Eurocode 2.

Keywords: Shrinkage, High performance concrete, Empirical model, Humid tropical weather