Experimental study on prevention of autogenous deformation by internal curing using super-absorbent polymer particles

Title: Experimental study on prevention of autogenous deformation by internal curing using super-absorbent polymer particles
Author(s): Shin-ichi Igarashi, Akio Watanabe
Paper category : conference
Book title: International RILEM Conference on Volume Changes of Hardening Concrete: Testing and Mitigation
Editor(s): O. M. Jensen, P. Lura, K. Kovler
Print-ISBN: 2-35158-004-4
e-ISBN: 2351580052
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 77 - 86
Total Pages: 10
Nb references: 13
Language: English

Abstract: Cement pastes and concretes with low water/binder ratios were cured internally by the incorporation of super-absorbent polymer (SAP) particles. Reduction in autogenous shrinkage by the internal curing was investigated in relation with characteristics of coarse capillary pore structure and volume fractions of constituent phases in cement paste matrix. The addition of SAP remarkably reduced autogenous shrinkage in cement pastes and concretes. However, the complete prevention of autogenous shrinkage was not always attained even when the extra amount of SAP was incorporated into the mixtures. Characteristic diameters in the coarse capillary pore structure decreased with time in the cement pastes with SAP. The internal water released from the SAP did not increase the degree of hydration of cement in the bulk cement paste matrix at early ages. However, the degree was slightly increased by the SAP at long ages. Transfer distance of the water from the SAP was estimated at most around few hundred µm. The volume protected by the internal water was reduced in the pastes with dense microstructure. The incorporation of SAP adversely reduced the strength of the cement pastes and the concretes. The proper size and amounts of SAP should be optimized for more efficient prevention of autogenous shrinkage, taking into account that the internal water supplied from SAP may affect the hydration of cement as to control the distance of water transfer in the vicinity of SAP.

Online publication: 2006-07-30
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580052.009