• MUHAMMED T.A. College of Engineering, University of Suleiman, Kurdistan Region-Iraq
  • KARIM F.R. College of Engineering, University of Suleiman, Kurdistan Region-Iraq
Keywords: Autogenous shrinkage, chemical admixture, internal curing (IC), mechanical properties, mineral admixture, ultra-high-performance concrete (UHPC).


This study presents the outcomes of a research investigation to examine the advancement of an internal curing technique for ultra-high-performance concrete (UHPC). A range of commonly utilized materials have been employed to promote internal curing and alleviate self-desiccation in cement paste. These materials ultimately aid in reducing the probability of developing cracks in hardened concrete. This study also highlights the attributes of Ultra-High Performance Concrete (UHPC), including its density, shrinkage (both of which are autogenous and induced by drying), the microstructure of hydrated Cementitious Paste (CP), and mechanical properties (specifically compressive strength, splitting tensile strength, and flexural strength).

The results indicate that internal curing (IC) exerts a more significant influence on the splitting tensile and flexural strengths in comparison to the compressive strengths. Several studies have reported that the incorporation of micro steel fibers in high-performance concrete (UHPC) leads to a slight enhancement in compressive strength and an even greater increase in flexural strength. This indicates that micro steel fibers have an observed influence on the mechanical characteristics of the material.

The internal curing (IC) has allowed for a gradual improvement in the compactness and density of the interfacial transition zone (ITZ), leading to a boost in its strength. The application of super absorbent polymers (SAP) in internal curing (IC) is intended to tackle the issue of self-desiccation and autogenous shrinkage, which can lead to early cracking in ultra-high-performance concrete (UHPC). The experimental investigation revealed that portlandite partially occupied the cavities of the Superabsorbent Polymers (SAP) during the process of hydration of cement (CH). The application of SAP (superabsorbent polymers) as an internal curing agent has demonstrated effectiveness in decreasing the inside relative humidity and alleviating autogenous shrinkage.


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How to Cite
T.A., M., & F.R., K. (2023). A CRITICAL REVIEW OF THE EFFECT OF INTERNAL CURING ON THE PROPERTIES OF ULTRAHIGH PERFORMANCE FIBER REINFORCED CONCRETE. Journal of Duhok University, 26(2), 65-77. https://doi.org/10.26682/csjuod.2023.26.2.8