PSI - Issue 17

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 il l li t . i ir t. i i Structural Integrity rocedia 00 (2019) 000 – 000

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Procedia Structural Integrity 17 (2019) 5–12

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. The main aim of this study is to determine the fracture energy of high performance concrete (HPC) containing silica fume (SF). The article presents the investigation on changes of the mechanical properties including compressive strength, splitting tensile strength, modulus of elasticity, fracture energy, and characteristic length of six HPC caused by the addition of SF. Additions of SF into the HPC were 0%, 5%, 10%, 15%, 20% and 25% by weight of cement content. The water/binder ratio was 0.25. The use of SF increased all tested mechanical properties of concrete. The study indicates that the mechanical properties of HPC were improved to a great extent at 28 days when cement used in concrete was replaced by SF. A 10% content of silica fume resulted in a 26% increase in tensile splitting strength, a 13% increase in compression strength and a 5% increase in the static modulus of elasticity. The brittleness of HPC increased with the presence of SF. The findings suggest that SF can effectively replace cement. Nevertheless, it is recommended that the replacement should not exceed 10%. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: high performance concrete; silica fume; compressive strength; tensile splitting strength; modulus of elasticity; fracture energy; characteristic length; microcrack e ai ai f t is st is t eter i e t e fract re e er f i erf r a ce c crete ( ) c tai i silica f e ( ). e article rese ts t e i esti ati c a es f t e ec a ical r erties i cl i c ressi e stre t , s litti te sile stre t , l s f elasticit , fract re e er , a c aracteristic le t f si ca se t e a iti f . iti s f i t t e ere , , , , a ei t f ce e t c te t. e ater/ i er rati as . . e se f i crease all teste ec a ical r erties f c crete. e st i icates t at t e ec a ical r erties f ere i r e t a reat e te t at a s e ce e t se i c crete as re lace . c te t f silica f e res lte i a i crease i te sile s litti stre t , a i crease i c ressi stre t a a i crease i t e static l s f elasticit . e rittle ess f i crease it t e rese ce f . e fi i s s est t at ca effecti el re lace ce e t. e ert eless, it is rec e e t at t e re lace e t s l t e cee . e t rs. lis e lse ier . . eer-re ie nder responsibility of the Scientific Committee of ICSI 2017. ey ords: high perfor ance concrete; silica fu e; co pressive strength; tensile splitting strength; odulus of elasticity; fracture energy; characteristic length; icrocrack ICSI 2019 The 3rd International Conference on Structural Integrity Influence of silica fume on mechanical and fracture properties of high performance concrete Piotr Smarzewski a, * a Lublin University of Technology, 40 Nadbystrzycka Str., Lublin, 20-618, Poland r I t r ti l f r tr t r l I t rit i t z i a, a ublin niversity of echnology, 40 adbystrzycka Str., ublin, 20-618, oland Abstract str ct I I

1. Introduction . I t ti

Concrete with characteristic compressive strength of 90 N/mm 2 at least can be simple produced by using moderate level of silica fume (SF), superplasticizer and normal aggregates, Yogendran et al. (1987). High performance concrete (HPC) is used in widely different civil engineering structures such as bridges and high-rise buildings. The employing of HPC can result in lower construction cost due to reduction in the size of concrete elements as well as in some cases r ssi str t f / 2 t l st si l r si r t l l f sili f ( ), s r l sti i r r l r t s, r t l. ( ). i rf r r t ( ) is s i i l iff r t i il i ri str t r s s s ri s i -ris il i s. l i f r s lt i l r str ti st t r ti i t si f r t l ts s ll s i s s s r t it r t risti

2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 2017 he uthors. ublished by lsevier . . eer-re ie er res si ilit f t e cie tific ittee f I I . * Corresponding author. Tel.: +48-081-538-4394 ; fax: +48-081-538-4391. E-mail address: p.smarzewski@pollub.pl * orresponding author. el.: 48-081-538-4394 ; fax: 48-081-538-4391. - ail address: p.s arze ski pollub.pl

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.002