Abstract
It is an urgent problem that the construction solid waste is difficult to be treated, and its recycling provides a way for its treatment. The quality of construction solid waste recycled aggregate is lower than that of natural aggregate, which limits its extensive application in building materials. In order to provide a new method for engineering application of recycled aggregate concrete, the influence of vibration mixing on the performances of full replacement recycled aggregate concrete were studied. The performance indexes of recycled aggregate concrete under ordinary mixing and vibration mixing were compared and analyzed. The experimental results show that compared with natural aggregate concrete, the slump of full replacement recycled aggregate concrete decreased by 58.8%, and 7d and 28d compressive strength decreased by 12.9% and 16.1%, and the splitting strength decreased by 30.6% and 20.1%, and the carbonation depth decreased by 91.5%; Compared with natural aggregate concrete using ordinary mixing, the slump of full replacement recycled aggregate concrete using vibration mixing decreased by 50.9%, the 7d and 28d compressive strength decreased by 6.9% and 10.9%, and the splitting strength decreased by 16.9% and 12.4%, and the 28d carbonation depth decreased by 34.9%. The results show that compared with ordinary mixing, vibration mixing can improve the performance of recycled aggregate concrete, which provides a reference for engineering application.
Highlights
Waste concrete is an important component of building solid waste, which will affect the environment and ecology if it can’t be properly disposed
In this paper, full replacement recycled aggregate concrete is produced using vibration mixing and ordinary vibration technology, and the performances of concrete using two mixing technology compared and analyzed, which provide a new method for improving the performances of recycled aggregate concrete
By using vibration mixing technology, the slump of natural aggregate concrete is 55 mm, and that of full replacement recycled aggregate concrete is 25 mm, which decreases by 54.5%
Summary
Waste concrete is an important component of building solid waste, which will affect the environment and ecology if it can’t be properly disposed. Li found that the application of recycled fine aggregate reduces the mechanical properties and durability of concrete, and the higher the content of recycled fine aggregate, the more obvious the deterioration of recycled concrete performance [6]. Strengthening the physical properties of recycled aggregate becomes a way to improve the performance of recycled concrete. Dong et al studied the effect of basalt fiber on the mechanical properties of recycled aggregate concrete. The results show that basalt fiber can effectively improve the mechanical properties of recycled aggregate concrete. In this paper, full replacement recycled aggregate concrete is produced using vibration mixing and ordinary vibration technology, and the performances of concrete using two mixing technology compared and analyzed, which provide a new method for improving the performances of recycled aggregate concrete
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