The rate of autogenous shrinkage (AS) development is a fundamental factor that highly influence the crack risk in low water cement mortar. Internal curing (IC) by using SAP has been used to reduce the AS in low water cement mortar and consequently mitigates the high risk of early-age cracking. Super absorbent polymers (SAP) supply additional IC water for hydration of mortar and as a result the effect of self-desiccation was minimized when the amount of internal water reduced. A series of autogenous shrinkage tests were performed considering two different SAP particle sizes in a constant curing temperature and humidity. The results indicated that IC method by using SAP fundamentally solved the problem of autogenous shrinkage in a low water cement ratio mortar.

Abstract
 1. Introduction
 2. Experimental investigation
  2.1 Material
  2.2 Preparation of specimen and test procedure
 3. Experimental Result
 4. Conclusion
 Reference

• 데제네아두네(충북대학교 토목공학과) | Gutema Dejene Adune
• 홍기남(충북대학교 토목공학과) | Hong Ki-Nam 교신저자