Abstract
To study the mechanical properties and conductivity enhancement effect of carbon fiber (CF) on reactive powder concrete (RPC), this work systematically investigated the changes in the compressive strength, elastic modulus, Poisson’s ratio, and pressure sensitivity of RPC under standard curing system. With age, CF content, and pressure sensitivity as parameters, the micro-method for scanning mechanism was used to study the effect mechanism of CF content on RPC. The experimental results showed that with the increase of carbon fiber content, poisson's ratio and compressive strength of carbon fiber RPC tended to increase first and then decrease. The elastic modulus decreased first and then increased, and 0.75% was the turning point of fiber content. With the increase of carbon fiber content, the resistivity decreases gradually, while the resistivity change rate (FCR) shows a trend of increasing and decreasing first, and there is a strong corresponding relationship between strain and FCR.When the CF content is 0.75%, the maximum FCR is 38.8%, which is increased by 33%. the CF RPC with a CF content of 0.75% is the highest stress and strain sensitivity group, reaching 2.05%/Mpa and 513.7, respectively.
Highlights
Damage detection and evaluation of concrete structures have been a hot topic in recent years[1]
When the CF content is in the range of 0% to 0.75%, the Poisson’s ratio of carbon fiber reactive powder concrete (RPC) is gradually higher than that of plain RPC
When the CF content in RPC is from 0% to 0.5%, the resistivity of CF RPC is significantly reduced by 75.3%
Summary
Damage detection and evaluation of concrete structures have been a hot topic in recent years[1]. The addition of fiber can significantly improve the mechanical properties and corrosion resistance of cement mortar[5,6,7].To address the aforementioned disadvantages, carbon fiber (CF) is added to reactive powder concrete (RPC). The basic principle of RPC formulation is to increase the activity and fineness of each part of the material Ultrafine powder such as silica fume is used for achieving a low water-to-gel ratio (W/B) to reduce porosity and obtain better strength[10]. The incorporation of CF improves the mechanical properties of concrete and cement mortar and promotes the development of smart concrete. The advantage of CF RPC is the combination of high strength and high sensitivity to meet the actual needs of engineering In this test, the mineral admixture is a silica fume-ore powder-fly ash cementing material system. The corresponding characteristics between the resistivity change rate (FCR) and external load can promote the further development of smart concrete
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