Abstract
To study the effect of redispersible polymer emulsion powder on the mechanical properties of carbon fiber-reinforced polymer concrete (CFRPC), the compressive, flexural, and splitting tests of CFRPC specimens with different polymer–cement ratios (polymer–cement mass ratios) were performed in this study. The modification effect of emulsion powder on CFRPC was analyzed from the perspectives of the strength and deformation properties of the specimens. The results show that the static properties of CFRPC increased first and then decreased with the increase of the polymer–cement ratio, in which the splitting tensile strength had the most significant increase; the flexural strength took second place and the compressive strength had a slight increase. When the polymer–cement ratio was 8%, the flexural and splitting tensile strength of the CFRPC specimens increased significantly by 36% and 61%, respectively. According to electron microscopy images, adding emulsion powder can effectively improve the structure of fiber–matrix transition zones and enhance the bond property between fibers and the matrix.
Highlights
Due to the good strength and constructability, concrete is widely used in construction engineering as an important building material
Whenthe theincrease polymer–cement ratio was 4%, 8%, and the flexural–compressive the polymer–cement ratio, the increase in the flexural strength was greater than that of the ratio increased by 6%, 34%, and 46%, respectively
When the polymer–cement ratio was 8%, the splitting tensile strength reached its peak value, 0.0013 which increased by 46%, while peak
Summary
Due to the good strength and constructability, concrete is widely used in construction engineering as an important building material. Due to the bond property between carbon fibers and the cement paste matrix, the carbon fibers can be pulled out or slip when the concrete is damaged In this condition, the enhancement and reinforcement of crack resistance are not sufficient [5,6]. The results showed that the added emulsion powder can obviously improve the tensile and flexural properties of cement mortar. The micro-structure of the interior interface transition zone of concrete was improved [16,17,18], and the bonding force between carbon fiber and the cement paste matrix was enhanced [19]. Flexural, splitting tensile strength, and peak strain of specimens, different polymer–cement ratios were studied from the perspective of strength and deformation properties. The reliability of the test results was verified by comparing the relationship between the static mechanical properties and polymer–cement ratio of concrete with two kinds of carbon fiber contents
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