Abstract
This study investigates the stabilization effect of a new soil stabilizer based on mineral powder, lime powder, dihydrate gypsum, and sodium hydroxide on the residue of construction waste (RCW). The performance of the residue solidified soil (RSS) with different ratios of stabilizer was analyzed both macroscopically and microscopically, in air and water environments.The experiment indicates that the optimal composition of the new stabilizer for specimen a7 consists of 85 % mineral powder, 3 % sodium hydroxide, and 12 % dihydrate gypsum. The water stability coefficients of specimens a3-a10 are all greater than 80 %.The performance of RSS meets the requirements of the Technical standard for application of soil stabilizer (CJJ/T286- 2018) and the technical specificatiopn for application of road solidified soil (T/CECS 737–2020). Therefore, the RSS designed and prepared in this study is a material with sufficient strength that can be used for urban road subbase layers. From a microscopic perspective, the generation of a large amount of ettringite crystals and C-S-H gel is the main reason for the increase in compressive strength of stabilized soil as it ages.The cost benefit analysis of the RSS that meets the strength requirements is carried out. The performance and cost of the RSS is also compared with the ones solidified by Portland cement and sulphoaluminate cement. From the economic point of view, most of the raw materials of the new soil stabilizer are cheap and easy to obtain, and the cost of the new soil stabilizer is much lower than that of Portland cement and sulphoaluminate cement, therefore the RSS should have strong market competitiveness.
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