Dry-wet cycles durability of solid waste based cementing materials solidifying different characteristic soils

Abstract

A comparative study of the durability of multi-source solid waste-based soil solidification materials in solidifying different soil types has not yet been conducted. Therefore, the properties of multi-source solid waste-based solidification materials (SBM) solidifying clay soil (CS), sandy soil (SS) and organic soil (OS) subjected to dry-wet cycles of damage were studied in this work. The unconfined compressive strength (UCS) of the SBM solidified soil was tested to evaluate the mechanical properties of the solidified soil. Scanning electron microscopy (SEM) and mercury injection porosimetry (MIP) tests were conducted in order to study the micro-action mechanism. The results demonstrated that the SBM showed wide applicability and good long-term performance. The rate of strength increase of the SBM solidified soil during the long-term curing period was found to be dependent on soil characteristics. All the types of SBM solidified soils exhibited increased UCS during the first 10 cycles of the D-W. As the number of D-W cycles increased from 10 to 50, the UCS loss rate for CS reached 78%, with OS experiencing the least at 58%. The structure of SBM solidified soil exhibited softening and weakened resistance to deformation with each additional D-W cycle. The types of hydration products were consistent across all three soil types. The quantity of hydration products was influenced by the characteristics of the soil, which also contributed to the deterioration of damage resistance in D-W cycles. The number of pores within the SBM solidified soil increased with the number of D-W cycles (>10 cycles), resulting in a deterioration of the compact structure.

Keywords

• durability
• solid waste
• solidification
• soil
• dry-wet cycle