Journal
MATERIALS
Volume 11, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/ma11071115
Keywords
high-performance fiber-reinforced cementitious composites (HPFRCCs); self-damage sensing; milled glass fibers (MGFs); electrical resistivity; interfacial bond strength
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Funding
- infrastructure and transportation technology promotion research program - Ministry of Land, Infrastructure, and Transport of the Korean government [17CTAP-C114934-02]
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The self-damage sensing capacity of high-performance fiber-reinforced cementitious composites (HPFRCCs) that blended long- (1 vol %) and medium-length (1 vol %) smooth steel fibers was considerably improved by adding milled glass fibers (MGFs) with a low electrical conductivity to a mortar matrix. The addition of MGFs (5 wt %) significantly increased the electrical resistivity of the mortar matrix from 45.9 to 110.3 k Omega.cm (140%) and consequently improved the self-damage sensing capacity (i.e., the reduction in the electrical resistivity during the tensile strain-hardening response) from 17.27 to 25.56 k Omega.cm (48%). Furthermore, the addition of MGFs improved the equivalent bond strength of the steel fibers on the basis of the higher pullout energy owing to the accumulated cementitious material particles attached to the surfaces of steel fibers.
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