Abstract
As a sustainable development requirement, rational utilization of solid waste has been paid more and more attention, such as acetylene sludge (AS), fly ash (FA), coal gangue, and construction waste used in civil engineering. The comprehensive utilization of the solid waste has already been developed for road engineering recently. This study focuses on the properties of base or subbase that are made of coal gangue and construction waste stabilized by AS and FA. The base or subbase material with various volumetric ratios of AS:FA:stacked coal gangue (SCG), AS:FA:air-washed coal gangue (ACG), AS:FA:recycled brick, and concrete debris (RBCD) were designed. In addition, their properties were tested, including unconfined compressive strength (UCS), indirect tensile strength (ITS), and compressive resilient modulus. The results showed that the UCS and ITS of the SCG stabilized by AS–FA are higher than that of the ACG stabilized by AS–FA. However, there was no significant correlation between UCS, ITS, compressive resilient modulus, and binder content of the AS/FA-stabilized RBCD. Even though the properties of the solid waste mixture were not stable enough, it could be potentially used in the base or subbase of the pavements.
Highlights
Due to the rapid development of urbanization around the world, the amount of the solid waste has been significantly increased
The results showed that bentonite and kaolin stabilized by 9% acetylene sludge (AS) were cured 28 days and 90 days, and their unconfined compressive strength (UCS) was increased by 4.7 times and 6.8 times, respectively
Because the dry density of AS and fly ash (FA) was less than that of the stacked coal gangue (SCG) and air-washed coal gangue (ACG), the maximum dry unit weights of the AS/FAstabilized SCG and AS/FA-stabilized ACG continued to decrease as the content of the AS and FA increased
Summary
Due to the rapid development of urbanization around the world, the amount of the solid waste has been significantly increased. Waste concrete of about 200 × 106 tons has currently been generated in the mainland of China every year, and coal gangue produced by coal mining is about 200 × 106 tons each year.[1,2,3] If these solid wastes are not properly disposed, they will occupy a large amount of land resources, and have a huge impact on the environment. With the rapid development of China’s road engineering, the consumption of natural aggregates in road construction is increasing year by year. If these solid wastes can be used in road construction, it will reduce the land resources for storing these solid wastes and their harmful impact on the environment, and bring down the consumption of natural aggregates
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