A creep prediction model for concrete made from pit sand with low silica content

Abstract Pit sand generally has a lower silica content than sand sourced from rivers or crushed stones. The effect of this sand on the creep of concrete has not yet been fully studied. Understanding the creep on concrete can help to estimate the behaviour of structures in the future. This study aims to investigate the effect of the properties of pit sand with different chemical compositions and grain size distributions on the creep of concrete, and to develop a creep prediction model for concrete made of pit sand with low silica content. This investigation employs laboratory testing to obtain the physical and chemical properties of the sand, as well as its relationship to shrinkage and creep of concrete. The results indicate that shrinkage in concrete is influenced by the water absorption of sand. It is also found that sand with a large Calcium Oxide (CaO) compound has a smaller shrinkage compared to those with small CaO content. This study shows that sand with a high percentage of fine grains and mud content exhibit a higher creep. A concrete creep prediction model is proposed based on the modification of the B3 Model. Modifications are made by proposing a material constant obtained from short creep tests. The creep parameter obtained from the test can be better used to predict the creep of concrete.