Abstract
The straining behavior of the shape memory alloy (SMA) fibers-reinforced mortar was investigated in this study by the monotonic compressive and cyclic compressive tests. Two types of SMA fibers with a crimped and dog-bone shape were used due to the high pullout resistance capacity, which guaranteed that the fibers and mortar matrix were composited well. The plain mortar was mixed with two different compositions to create the higher elastic modulus mortar matrix and the lower elastic modulus mortar matrix compared with the elastic modulus of SMA fibers. The results of the experimental test indicated that the non-heated SMA fibers could control the strains in both elastic and plastic phases; in which, the crimped fiber was more effective in precracking due to the higher composite capacity while the dog-bone-shaped fiber had a higher effect in post-cracking. After heating, the dog-bone-shaped fiber slipped more than that of the crimped fiber; thus, the heated crimped fiber was more effective than the heated dog-bone-shaped fiber in controlling strains after cracking. The effect of SMA fibers on the elastic modulus depended on both the elastic modulus of mortar matrix and the property of SMA fibers. In the plastic phase, the fibers were effective on reducing the speed of damage in monotonic case. An equation using reinforcing index was suggested for damage evolution in the cyclic case.
Highlights
It is well known that mixing short and discrete fibers into the mortar randomly or uniformly increased the performance of cementitious composite under static, quasistatic loads and the shock, fatigue loads
As steel, shape memory alloy (SMA), glass, or carbon fibers own much higher tensile strength and elastic modulus than the synthetic fibers, they are investigated to be more effective in spreading the tensile forces in the mortar matrix and their transmissions to the adjoining mortar are better than the synthetic fibers
Should be mentioned the loading caused by the difference in the elastic modulus of the mortar matrix and the embedded in the first cycle was similar to that of the monotonic test
Summary
It is well known that mixing short and discrete fibers into the mortar randomly or uniformly increased the performance of cementitious composite under static, quasistatic loads and the shock, fatigue loads. Pullout resistance of fibers, and mortar matrix are indicated that they present the role in controlling post-cracking behavior of reinforced mortar. The low elastic modulus of synthetic fibers reduces their transference in tension; they are less contributed to tensile/compressive behavior after cracking. The strain behaviors of reinforced mortar with SMA fibers in SMA fibers in both heat treatments are not invested yet. For the widely applying in construction and ensuring composite capacity of fibers and mortar matrix, the crimped shape and the and ensuring composite capacity of fibers and mortar matrix, the crimped shape and the dog-bone shape are used to investigate the effect on controlling axial and lateral strains dog-bone shape are used to investigate the effect on controlling axial and lateral strains under both monotonic compressive load and cyclic compressive load.
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