Abstract
Soda residue (SR), a waste by-product of sodium carbonate production, occupies land resources and pollutes the environment seriously. To promote the resource reusing of waste SR, this paper studies the feasibility of utilizing SR for the preparation of soda residue soil (SRS) through laboratory and field tests. The SR and fly ash (FA) were mixed with six different proportions (SR:FA is 1:0, 10:1, 8:1, 6:1, 3:1, 1:1) to prepare SRS, and the optimum water content, maximum dry density, shear strength, and unconfined compression strength of the SRS were measured. The representative SRS (SR:FA is 10:1) was selected to investigate the compression performance and collapsibility. The preparation and filling method of SRS in the field was proposed, and the effects of gravel, sand, and lime on the mechanical properties of SRS were studied through field tests. The results show that the addition of FA contributed to the strength development of SR, and the addition of lime, sand and rubble have a significant effect on the subgrade bearing capacity of SRS. The subgrade bearing capacity and deformation modulus of SRS in field tests is more than 210 kPa and 34.48 MPa, respectively. The results provide experimental basis and reference for the preparation of SRS, the scientific application of SRS in geotechnical engineering to promote sustainable development.
Highlights
Sodium carbonate is one of the important organic chemical raw materials, widely used in the chemical industry, food industry, metallurgical industry, textile industry, and many other fields [1,2,3]
The ammonia soda process is the common method for manufacturing sodium carbonate, but this method produces a large amount of soda residue (SR) during production [4,5]
The objective of this paper was to validate the feasibility of using soda residue as the main raw material for preparation of soda residue soil; the preparation method in the field was proposed, and mechanical properties of soda residue soil with different mixing proportions and materials were investigated
Summary
Sodium carbonate is one of the important organic chemical raw materials, widely used in the chemical industry, food industry, metallurgical industry, textile industry, and many other fields [1,2,3]. The ammonia soda process is the common method for manufacturing sodium carbonate, but this method produces a large amount of soda residue (SR) during production [4,5]. At present, building a storage yard next to the soda plant and discharging the SR into the storage yard is a common way to dispose of the SR [9,10,11]. This approach has the disadvantage of occupying amounts of land, polluting the local ecology, and failing to achieve sustainable resource and economic development [12,13]. The scientific treatment of SR has been a troublesome problem
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