Properties of Steam Cured Recycled Aggregate Fly Ash Concrete

Title: Properties of Steam Cured Recycled Aggregate Fly Ash Concrete
Author(s): Kou
Paper category : conference
Book title: International RILEM Conference on the Use of Recycled Materials in Building and Structures
Editor(s): E. Vázquez, Ch. F. Hendriks and G.M.T. Janssen
Print-ISBN: 2-912143-52-7
e-ISBN: 2912143756
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 590 - 599
Total Pages: 10
Nb references: 23
Language: English

Abstract: The effects of steam curing on the hardened properties of recycled aggregate concrete
prepared with fly ash as a partial replacement of cement were investigated. The concrete
mixtures were prepared with a water-to-binder (W/B) ratio of 0.45. The recycled aggregate
was used as 0, 20, 50 and 100 % by weight replacements of natural aggregate. In addition, fly
ash was used as 0, 25 and 35 % by weight replacements of cement. The concrete specimens
underwent standard water curing and steam curing regimes. The test results showed that the
strength of concrete decreased as the recycled aggregate content increased. An initial steam
curing regime increased the 1-day strength of the concrete but the corresponding 28 and 90-
day strengths decreased. Furthermore, steam curing reduced the static modulus of elasticity
of concrete compared to that of the water cured concrete. However, the negative effect of
steam curing diminished as the recycled aggregate and fly ash contents increased. Moreover,
steam curing reduced the drying shrinkage and increased the resistance against chloride ion
penetration of the recycled aggregate concrete prepared with fly ash. The results show that
one of the practical ways to utilize a higher percentage of recycled aggregates in structural
concrete is by incorporating 25-35 percents of fly ash and with steam curing.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.065