Temperature Effects on Performance of Cementitious Systems: Microstructure and Transport Properties

Author(s): Yuvaraj Dhandapani (1)*, Karen L. Scrivener (2) and Manu Santhanam(1)
Paper category: Proceedings
Book title: Proceedings of the 71st RILEM Annual Week & ICACMS 2017,Chennai,India, 3rd -8th September 2017
Editor(s): Manu Santhanam
Ravindra Gettu
Radhakrishna G. Pillai
Sunitha K. Nayar
ISBN: 978-2-35158-196-4
ISBN: 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9:
Publisher: Published by RILEM Publications S.A.R.L.
Publication year: 2017
Pages: 376-385
Total Pages: 10
Language : English

Abstract: This paper discusses the temperature effects on the transport properties of the cementitious
systems with insights on the variation in the kinetics of hydration, hydration products, and
changes in the composition of the microstructure. From the investigation on OPC (ordinary
Portland cement) and FA30 (Portland pozzolana cement; 30 % substitution with siliceous fly
ash) at 20 oC, 40 oC and 60 oC, it was seen that elevated temperature had detrimental effects on
the performance of the OPC cementitious systems. The OPC system (w/c ratio: 0.4) showed a
coarsening of the pore structure with denser hydration products from the assessment by
mercury intrusion porosimetry and scanning electron microscopy respectively. These changes
in the microstructure resulted in a lower resistivity, a reduction in the formation factor, and a
decrease in the chloride resistance of the OPC systems with increasing curing temperature.
However, in the case of FA30, the acceleration of the pozzolanicity of the fly ash outweighs
the detrimental effect of the temperature on the performance of the cementitious systems. The
necessity of supplementary cementitious materials for improving the performance of concrete
cured at elevated temperature or in hot weather is strongly emphasised from this experimental
study.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00