EVALUATION OF CURRENT MODELS FOR ESTIMATING LONG-TERM SHRINKAGE OF LIGHTWEIGHT AGGREGATE CONCRETE

  • SA Kristiawan Sebelas Maret University, Solo, Indonesia

Abstract

Shrinkage is a time dependent phenomenon that will affect the performance of structural concrete after years. Its long-term effect should be anticipated at design stage by engineers. It is common practice to measure shrinkage for short-term period and use these short-term data to predict the long-term values using the available models and then calculate its long-term effect on structural concrete. Currently, several shrinkage prediction models have been suggested in literatures but they are developed for normal weight concrete. The  suitability of these  models  for estimating  long-term shrinkage of  lightweight aggregate concrete (LWAC) was assessed in this research. The differences in predictions with the actual shrinkage values are quantified using best-fit line, residual analysis and coefficient of variation of error. Based on these quantifications, the following order is obtained in term of accuracy of shrinkage prediction for LWAC: ACI 209R-92, GL 2000 and CEB-FIP 1990. Best-fit line method of analysis indicates that the models will give at least  20% differences with the actual value. Residual analysis shows the difference between predicted  and  measured  shrinkage  at  a  range  inside  100  micro  strains  is  about  10-25%.  It  is  also concluded that the current models generally cannot be expected to predict shrinkage of LWAC that will give coefficient of variation of error within 30%.

Published
2011-08-01
How to Cite
KRISTIAWAN, SA. EVALUATION OF CURRENT MODELS FOR ESTIMATING LONG-TERM SHRINKAGE OF LIGHTWEIGHT AGGREGATE CONCRETE. EACEF - International Conference of Civil Engineering, [S.l.], v. 1, p. 021, aug. 2011. Available at: <http://proceeding.eacef.com/ojs/index.php/EACEF/article/view/104>. Date accessed: 19 may 2024.
Section
Group of Building Materials Engineering (Nanotechnology)