FraMCoS 11 2023 Bangalore, India

Study on interaction between fracture and creep of uhsc using microindentation technique

The interaction between fracture and creep in cementitious materials can be interpreted as the cracking that occurs during sustained loading and the effect this cracking has on subsequent change of creep. This study aims at examining creep-fracture interaction in UHSC…

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Year 2023
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Abstract

The interaction between fracture and creep in cementitious materials can be interpreted as the cracking that occurs during sustained loading and the effect this cracking has on subsequent change of creep. This study aims at examining creep-fracture interaction in UHSC cement paste mixes (w/b = 0.20) with varying levels of silica fume (SF) replacement (0%, 20%, and 40%) for the two different holding periods (5s and 180s) at different ages (3d, 7d, 28d, 90d) using microin- dentation technique. This preliminary results of a detailed experimental investigations revealed that longer dwelling time (180s) under sustained load led to decrease in fracture toughness (K ), indicat- c ing progressive internal microcracking. This microcracking cause relaxation of stress at one site and overstressing at other site. This stress imbalance due to microcracking, influence the long-term creep rate thereby establishing an interaction between creep and fracture.