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The effect of slag on durability of lightweight concrete



Title: The effect of slag on durability of lightweight concrete
Author(s): Hongzhi Cui, T.Y. Lo, Feng Xing
Paper category : conference
Book title: 2nd International Symposium on Service Life Design for Infrastructures
Editor(s): K. van Breugel, Guang Ye, Yong Yuan
Print-ISBN: 978-2-35158-096-7
e-ISBN: 978-2-35158-097-4
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 741 - 747
Total Pages: 7
Nb references: 13
Language: English


Abstract: Ground granulated blast-furnace slag (GGBS) is a residue of steel production. It is a latent hydraulic binder and is normally used to improve the durability of concrete and mortars; at the same time, for the global environment, GGBS displays pozzolanic reactions and replacement of Portland cement can effectively reduce CO2 emissions in the cement industry; therefore, many research projects investigate the properties of concrete with GGBS. Song and Saraswathy’s study showed that GGBS in concrete reduced heat evolution increased the compressive strength at later ages, decreased chloride ion penetration and increased resistance to sulphate attack and alkali-silica reaction. In fact, among the research, there is not many reports of the properties of lightweight aggregate concrete (LWAC) with GGBS.
This paper studies the effect of ground granulated blast-furnace slag (GGBS) on carbonation and water permeability of structural lightweight aggregate concrete (LWAC). The testing results of LWAC with 350 kg/m3 cement and three GGBS dosages (0%, 25%, and 40% replacement by mass of cement) were compared. Half of the LWAC specimens were initially cured under standard 27±3 °C water for 28 days, and the other specimens were cured under 60 °C hot water for 3 days. After the curing, two carbonation experiments (i.e. 28 days accelerated carbonation and 1.5 years outdoor exposure) were carried out and carbonation depths of resulting specimens were measured. The results presented that permeability coefficient of the LWAC decreased remarkably as the GGBS dosage increased, and the carbonation depth of the concrete increases as GGBS dosage increases.


Online publication: 2011-04-20
Publication type : full_text
Public price (Euros): 0.00