Crumb Rubber as a Concrete Additive: Effect of Specific Surface on Air Void Content

Author(s): Adrian Zimmermann, Sha Yang and Eduardus A. B. Koenders
Paper category: Proceedings
Book title: 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): Changwen Miao, Wei Sun, Jiaping Liu, Huisu Chen, Guang Ye and Klaas van Breugel
Print-ISBN: 978-2-35158-188-9
e-ISBN: 978-2-35158-189-6
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 267-274
Total Pages : 8
Language : English

Abstract: Crumb rubber, which is produced from scrap tires, entrains air pores in cementitious matrices and thus increases the frost resistance of concrete. In the present paper, the correlation between the specific surface of crumb rubber and the amount of entrained air is investigated. To this end, prognoses are derived and experimentally validated. The experimental program includes a determination of the specific surface of crumb rubber by incident light microscopy and laser granulometry followed by a measurement of air void content in concrete by pressure equalization method and via density of fresh concrete. The experiments are based on crumb rubber of grain fractions 0–125 μm, 125–180 μm, 180– 250 μm, 250–400 μm and 400–600 μm. All sample mixtures are prepared with a crumb rubber content of 15 kg/m3, which corresponds to approximately 1.3 vol% of fresh concrete.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00