Effect of Ultrafine Materials on Drying Shrinkage of Concrete

The utilization of ultrafine materials in concrete has gained significant notice in modern times for its potential to enhance the properties of concrete. The drying shrinkage of concrete, which happens when concrete loses moisture and contracts, is one of the main issues in the workplace’s building. If this is not handled correctly, it may result in cracks and damage. This study examined the impact of ultrafine materials on the drying shrinkage of concrete, and the results are presented in this report. The research involved using ultrafine slag and ultrafine fly ash as partial replacements of cement in concrete for a grade of M35. The specimens were prepared with ultrafine of 10% replacement with cement as optimal, and the drying shrinkage was measured and compared to a control specimen without ultrafine materials. In the investigation, the hardened properties, including compressive strength and flexural strength, as well as the shrinkage test, were carried out. The findings revealed that the utility of ultrafine materials decreased the drying shrinkage of concrete, with ultrafine slag being more effective than ultrafine fly ash. The pozzolanic reaction of these materials contributed to the formation of additional calcium silicate hydrate (C-S-H) gel, which packed any voids and reduced the overall porosity of the concrete, resulting in a reduction in drying shrinkage. In conclusion, the study suggests that the utilization of ultrafine materials in concrete can effectively decrease the drying shrinkage of concrete, with ultrafine slag being more effective than ultrafine fly ash. However, further research is recommended to investigate the long-term effects of using these materials on the endurance of concrete. This investigation highlights the potential of ultrafine materials as a sustainable solution to boost the properties of concrete, particularly the drying shrinkage of concrete.