Abstract
In response to a series of national strategic guidelines for green and sustainable development, recycled concrete is used as a recyclable resource. First, the mechanical properties, workability, and durability of recycled concrete are briefly introduced, and the benefit and necessities of research on recycled concrete are described from environmental, economic, and social perspectives. Second, the mixing method and molding process of recycled concrete are described in detail, and the influence of vibration molding and compression molding on the performance of recycled concrete is analyzed. It is found that the compressive strength first increases and then decreases with the increase of molding pressure. In addition, porosity decreases as molding pressure build-up. Therefore, it is recommended that the molding pressure of recycled concrete be generally controlled between 600 and 800 N. Then, the influence of the water-cement ratio on recycled concrete’s fluidity and mechanical properties is discussed. It is found that with the increase of the water-cement ratio, the compressive strength first increases and then decreases and the optimum water-cement ratio is proposed to be 0.2. Finally, the application status and problems of recycled concrete in road engineering are briefly described, and relevant suggestions for construction technology are put forward. Based on the fire safety and reliability requirements of concrete structures, the performance of high-performance concrete structures after fire can be restored to the initial level or even improved through the processes and measures of building structure design, repair, and reinforcement; the strength and crack healing of high-performance concrete after fire can be gradually restored by applying or soaking repair agent and water curing; the recovery of pH value of concrete after fire and the reduction of carbonation depth can be realized by using electrochemical realkalization technology; using carbon fiber to strengthen the components after fire can restore the bearing capacity, but the degree of stiffness recovery is low; and beam side steel plate reinforcement and steel bonding reinforcement can realize the recoverability of bearing capacity, stiffness, and ductility of members after fire.
Highlights
China’s economic development has made remarkable achievements, and people’s basic survival needs have been satisfied already
Environmental protection, and sustainable development have become the focus of society in this context
Is phenomenon is contrary to the concept of environmental protection and sustainability, taken seriously by the industry and the country. erefore, a technology for making green and environmental-friendly recycled concrete from abandoned concrete and reusing it for road engineering construction has been widely studied and applied [1]
Summary
China’s economic development has made remarkable achievements, and people’s basic survival needs have been satisfied already. Wajeeha et al [6] studied the durability of recycled concrete with different replacement rates of recycled coarse aggregate in a chloride environment. Zhang et al [7] studied the mechanical properties of recycled concrete with the replacement rate of a recycled coarse aggregate of 0%, 25%, 50%, 75%, and 100%, respectively. E mechanical properties of green environmental-friendly concrete are related to its breaking method of recycled aggregate, the strength of abandoned concrete, water-cement ratio, and specific construction environment [12]. The strength of recycled concrete is inversely proportional to the replacement rate of recycled aggregate, positively proportional to the water-binder ratio, and positively proportional to the strength of abandoned concrete. E workability of green recycled concrete is related to the replacement rate of recycled aggregate and the water-binder ratio. Improving the property of recycled concrete will inevitably lead to the increase of its preparation cost, which requests the engineers to select the optimal balance point according to the application requirements of road engineering and the comprehensive consideration of cost
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