Uniaxial compressive cyclic behavior of mortar reinforced with crimped or dog-bone-shaped SMA fibers

Choi, Eunsoo; Kim, Woo Jin; Kim, Tae-Sik

doi:10.1016/j.compstruct.2021.113600

Cited by 11 publications

(6 citation statements)

References 49 publications

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“…For the plain mortar specimen under static loadings, heating at 150 °C did not decrease its compressive strength. For example, in the monotonic static compressive test, the heated specimen showed an increase in compressive strength of 11.9%, and with the cyclic static compressive test, the heated specimen showed the same compressive strength as that of the non-heated specimens [ 24 ]. Thus, the heating may induce micro-damage in the mortar, but the damage did not impute a negative effect or cause a decrease in the compressive strength.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…Moreover, that temperature does not harm the mortar’s properties. In recent studies the oven heating method was used to investigate the effect of recovery stress on the reinforced mortar’s monotonic, cyclic compressive behavior [ 24 , 25 ]. The reinforced specimens, made with either crimped or dog-bone-shaped SMA fibers, were named CR specimens and DG specimens, respectively, whereas the plain specimen was called P specimen.…”

Section: Experimental Testmentioning

confidence: 99%

“…The dimensions of SMA fibers are presented in Figure 1, whereas the direct tensile behavior and pullout behavior are shown in Figures 2 and 3, respectively. The production of the SMA fibers and details of the tensile test and pullout test were presented in recent studies [22][23][24][25][26]. The crimped and dog-bone-shaped fibers produce the same tensile behavior in heating and non-heating with the yield stress of 950 MPa.…”

Section: Specimensmentioning

confidence: 99%

“…Many SMA fiber shapes, such as dog-boned-shaped, L-shaped, N-shaped, paddle-shaped, and crimped, have been introduced [ 21 ]. Crimped and dog-boned-shaped fibers have shown great potential because they have high pullout resistance and are mass-produced [ 22 , 23 , 24 ]. A dog-bone-shaped fiber is easily created by heating the end parts, while a crimped fiber is produced continuously by a rolling device.…”

Section: Introductionmentioning

confidence: 99%

“…A dog-bone-shaped fiber is easily created by heating the end parts, while a crimped fiber is produced continuously by a rolling device. Thus, in previous studies we mixed the two fibers mentioned in the mortar matrix to investigate the reinforced mortar’s uniaxial monotonic and cyclic compressive behavior [ 24 , 25 ]. The fibers were verified to positively improve the mechanical properties of reinforced mortar under various compressive loads.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Behaviors of Mortar Reinforced with NiTi SMA Fibers under Impact Compressive Loading

Choi

Seo

2021

Materials

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In this study, a compressive impact test was conducted using the split Hopkinson pressure bar (SHPB) method to investigate SMA fiber-reinforced mortar’s impact behavior. A 1.5% fiber volume of crimped fibers and dog-bone-shaped fibers was used, and half of the specimens were heated to induce recovery stress. The results showed that the appearance of SMA fibers, recovery stress, and composite capacity can increase strain rate. For mechanical properties, the SMA fibers reduced dynamic compressive strength and increased the peak strain. The specific energy absorption of the reinforced specimens slightly increased due to the addition of SMA fibers and the recovery stress; however, the effect was not significant. The composite behavior between SMA fibers and the mortar matrix, however, significantly influenced the dynamic compressive properties. The higher composite capacity of the SMA fibers produced lower dynamic compressive strength, higher peak strain, and higher specific energy absorption. The composite behavior of the dog-bone-shaped fiber was less than that of the crimped fiber and was reduced due to heating, while that of the crimped fiber was not. The mechanical properties of the impacted specimen followed a linear function of strain rate ranging from 10 to 17 s−1; at the higher strain rates of about 49–67 s−1, the linear functions disappeared. The elastic modulus of the specimen was independent of the strain rate, but it was dependent on the correlation between the elastic moduli of the SMA fibers and the mortar matrix.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Section: Experimental Testmentioning

confidence: 99%