In order to improve the utilization rate of recycled aggregate from construction waste, this paper studies the influence of recycled aggregate replacement rate on the performance of fresh concrete. The slump, 7d and 28d unconfined compressive strength of fresh concrete were studied by mixing recycled concrete with different replacement rates. The test results show that: compared with ordinary concrete, when recycled aggregate is completely replaced, the slump of concrete decreases by 58.8%, and the workability becomes worse; in the process of replacement rate from 0 to 100%, the 7d compressive strength decreases slowly, and the decline rate is 16.2%. The 28-day compressive strength decreased by 12.1%, and the mechanical properties decreased.
The “Guiding Opinions on the Comprehensive Utilization of Bulk Solid Waste during the 14th Five-Year Plan” issued by the Ministry of Ecology and Environment in 2021 pointed out that by 2021, China’s cumulative bulk solid waste stockpiles are about 60 billion tons, and the annual new stockpiles are nearly 3 billion. At the same time, there is a problem of low solid waste utilization rate, occupying a large amount of land resources, and a large hidden danger to the ecological environment. In order to further improve the utilization of solid waste, reduce the cost of road construction, and reduce the damage and impact of solid waste accumulation on the environment. This paper analyzes phosphogypsum impaction of the incorporation of various solid wastes on asphalt penetration, softening point, ductility and other properties, as well as the impact on the high temperature stability, low temperature crack resistance and water stability of asphalt mixtures, and the summarize and evaluate the microscopic modification mechanism and other aspects. At present, there is a relatively lack of research on the reuse of some solid wastes in asphalt in China. This review can provide reference and reference for judging a variety of solid wastes as asphalt modifiers, promote the green reuse of solid wastes, and reduce the construction of asphalt pavements.
It has the goal of green construction to use recycled aggregate of waste cement concrete in cement stabilized macadam base to replace recycled aggregate of base. In this paper, the properties of cement stabilized macadam with natural aggregate and recycled aggregate under different replacement ratios are compared. The test results show that the physical properties (apparent density, mud content, crushing value, water absorption, etc.) of recycled aggregate are lower than those of natural aggregate, but meet the requirements of the specification. With the increase of the proportion of recycled aggregate in cement stabilized macadam, the optimal moisture content required for the maximum dry density of fully recycled aggregate mixture increased by 20.6% compared with that of natural aggregate mixture; the unconfined compressive strength of cement stabilized macadam with recycled aggregate at 7d and 28d showed a downward trend, and the strength of cement stabilized macadam with fully replaced recycled aggregate at 7d and 28d decreased by 10% and 1% respectively 0%. In addition, the strength of full substitution 28 increased by 11.1%. The research shows that the recycled aggregate base can meet the construction requirements, and the vibration mixing has better advantages, which provides a reference for engineering application.
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