The influence of partial cement replacement by fly ash and silica fume on the hydro-abrasive resistance of concrete

Author(s): N.S. Ristić, Z.J. Grdić, G.A. Topličić-Ćurčić, D.Z. Grdić
Paper category: Workshop
Book title: RILEM International workshop on performance-based specification and control of concrete durability
Editor(s): D. Bjegović, H. Beushausen, M. Serdar
ISBN: 978-2-35158-135-3
e-ISBN: 978-2-35158-136-0
Pages: 33 - 40
Total Pages: 8
Language: English

Concrete of hydraulic structures is constantly exposed to abrasion, that is, surface erosion caused by the impacts of solid particles borne by water and by the action of hydraulic forces on concrete. This study investigates the abrasion–erosion resistance of concrete mixtures in which cement was partially replaced by four kinds of replacements (15%, 20%, 25% and 30% by weight) of fly ash and 10 weight % silica fume. The specimens were tested for compressive strength, flexural strength, bond strength by “Pull-off” method, static modulus of elasticity, velocity of ultrasound through concrete, rebound of sclerometer and abrasion by Bohme. The concrete abrasive resistance tests were carried out by the accelerated test on the original apparatus which enables a jet of mixed water and sand to impact the surface of a concrete specimen at high velocity. The test where 10 wt. % of cement was replaced by silica fume demonstrated the best hydro-abrasion resistance, while the test where 15 wt. % of cement was replaced by fly ash yielded approximately the same hydro abrasion resistance as the reference concrete. The replacement of cement by fly ash in the amount higher than 15 wt. % resulted in lower hydro-abrasive resistance in comparison to the reference concrete. There was a good correlation between the static modulus of elasticity and compressive strength ratio and hydro-abrasive resistance of concrete.

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

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