Journal
CEMENT & CONCRETE COMPOSITES
Volume 122, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2021.104116
Keywords
Compressive strength; Flexural strength; Subnormal temperatures; Impact resistance; Steel fibers; Fiber-reinforced concrete
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This study found that using steel fibers in concrete at cold temperatures can improve mechanical properties and impact resistance, reduce low temperature brittleness, with more significant effects when larger volume and longer lengths of steel fibers are used.
This study investigates the impact resistance and mechanical properties of steel fiber reinforced concrete at cold temperatures. The studied parameters include types of steel fibers (SFs) (needle fibers, single hook end, and double hook end), lengths of SFs (35 mm and 60 mm), volumes of SFs (0%, 0.35%, and 1%), coarse to sand aggregate (C/S) ratio (0.7 and 2), coarse aggregate size (10 mm and 20 mm), and cement content (300 kg/m3 and 550 kg/m3). The studied mixtures were tested under different temperatures including room temperature (20 degrees C), 0 degrees C, -10 degrees C, and -20 degrees C. The results show an improvement in the mechanical properties and impact strength at cold temperatures, with more brittle failure. The results also show that using SFs improves the mechanical properties and impact resistance of concrete at cold temperatures and reduces the low temperature brittleness of the concrete. Moreover, the effect of cold temperatures on enhancing the mechanical properties and impact resistance is more pronounced when larger volume and longer length of SFs were used.
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