Abstract
By applying early disturbance to the concrete, the influence of the disturbance on the macroscopic mechanical properties of basalt fiber concrete during the period from the initial setting to the final setting is explored, and the influence mechanism is revealed. Also, the influence of this disturbance on the process of sulfate erosion of concrete is evaluated by the sulfate erosion test and by the ultrasonic data acquisition of its damage process. The experimental results show that the flexural strength of basalt fiber concrete is increased after the concrete has been disturbed in the early stage of condensation but is decreased in the middle stage of condensation and is not affected in the later stage. When the condensation and hardening processes are disturbed, damage is caused inside the concrete, which is greater with the increase in the condensation degree until the penetration resistance reaches about 15 MPa, which then is more and more reduced. The durability of basalt fiber concrete is reduced by disturbance, which has a significant effect on it when the penetration resistance is between 7 MPa and 16 MPa.
Highlights
Concrete materials demonstrate excellent compressive performance, but the tensile strength is only 1/10 of its compressive strength, which is unfavorable to the concrete in the tensile zone of the structure [1,2,3]
Addition of fiber can much improve this defect. ere are many kinds of fibers often used in concretes, such as steel fiber, carbon fiber, glass fiber, cellulose fiber, polypropylene fiber, and polyvinyl acetate (PVA) fiber [4, 5]. e addition of fiber can improve the strength and durability of concrete, prolong its service life, and adapt to complex environment [6,7,8]
By disturbing the basalt fiber concrete and investigating the influence of basalt fiber on the macroscopic mechanical properties of the disturbed concrete, this paper establishes the relationship between the microscopic strengthening mechanism and the macroscopic mechanical properties of basalt fiber concrete. e main conclusions are as follows: (1) A variety of comparative tests show that the mechanical and antidisturbance properties of basalt fiber concrete are superior to that of plain concrete. is finding can be used in engineering practice to increase the safety and stability of concrete by adding basalt fiber
Summary
Concrete materials demonstrate excellent compressive performance, but the tensile strength is only 1/10 of its compressive strength, which is unfavorable to the concrete in the tensile zone of the structure [1,2,3]. In the early stage of condensation and hardening, since the cement hydration process has not been completed, the strength and bonding properties of concrete continue to change with the age of it, and the structural properties of concrete keep changing. Studies show that addition of fibers significantly improves the early plastic cracking, antiabrasion, and impact resistance of mortar and concrete [18]. Basalt fiber is a new type of concrete reinforced material It has the advantages of high cost performance, high tensile. Erefore, systematic research on the impact of disturbance on the performance of early basalt concrete is of important theoretical and practical value to the analysis and control of early disturbance safety during the construction period of fiber-reinforced concrete structures The research on basalt fiber in the field of civil engineering is mainly focused on the mechanical properties of basalt fiber concrete, but the influence of disturbance on basalt fiber concrete is rarely studied [23]. erefore, systematic research on the impact of disturbance on the performance of early basalt concrete is of important theoretical and practical value to the analysis and control of early disturbance safety during the construction period of fiber-reinforced concrete structures
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