INFLUENCE MECHANISM OF COMPLEX ADMIXTURES ON CHLORIDE DIFFUSION COEFFICIENT OF C50 SELF-COMPACTING CONCRETE FOR MARINE ENVIRONMENT

Author(s): Li Pengping, Fan Zhihong and Xiong Jianbo
Paper category: Proceedings
Book title: Proceedings of CONSEC13 Seventh International Conference on Concrete under Severe Conditions - Environment and Loading Volume I
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 495-501
Total Pages: 961
Language : English

Abstract: The influence of complex admixtures on chloride diffusion coefficient of C50 self- compacting concrete for marine environment was investigated by means of the NT BUILD 443 Test, and the influence mechanism of complex admixture on the diffusion coefficient was studied by chemically combined water test, XRD, SEM and pore structure determination test, respectively. The results showed that the chloride diffusion coefficient first decreased and then increased with increasing the fly ash content in complex cementitious material. The hydration degree of cementitious material were not the same with different proportion of mineral admixture and different curing period, it’s more helpful to promote the fly ash hydration degree for extending curing period. Furthermore, the porosity and average pore size decreased first but then increased with increasing the fly ash content in complex cementitious material, the porosity and average pore size got the lowest value when the fly ash content was 20% in cementitous material, and the admixture influencing the chloride diffusion coefficient was due to the changes of concrete pore structure which was influenced by the mineral admixture.

Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00