In cold regions, the integrity of the infrastructures built on weak soils can be extensively damaged by weathering actions due to changes in climatic conditions, which are referred to as freeze-thaw cycles. This damage can be mitigated by exploiting soil stabilization techniques that improve the engineering properties of the soils. Generally, ordinary Portland Cement (OPC) is the most commonly used binding material as extensive researches have been studied for the behavior of the cementing agent. However, due to the issue of OPC producing a significant amount of carbon dioxide emission, calcium sulfoaluminate (CSA) cement which has a lesser carbon footprint can be used as one of the eco-sustainable alternatives. Although several studies have been conducted on the strength development of CSA treated sand for replacing OPC in ground improvement, no research has been concerned about CSA cement-stabilized sand affected by cyclic freeze and thaw. This study aims to fill such a research gap by conducting a comprehensive laboratory work to assess the effect of the cyclic freeze-thaw action on strength and durability of CSA cement-treated sand. For this purpose, unconfined compressive strength (UCS) was performed on the stabilized soil specimens cured for 7 and 14 days which are subjected to 0, 1, 3, 5, and 7 freeze-thaw cycles. The test results show that the strength and durability index of the samples decrease with the increase of the freeze-thaw cycles. The loss of the strength and durability considerably decreases for all soil samples subjected to the freeze-thaw cycles when CSA content increases from 3% to 10%. The early freeze-thaw cycles (1 and 3) have a higher negative influence on the durability index compared to later freeze-thaw cycles (5 and 7). Overall, the use of CSA as a stabilizer for sandy soils would be useful to achieve sufficient strength and durability against the freeze-thaw action in cold regions.
|Title of host publication||The 2020 World Congress on Advances in Civil, Environmental, & Materials Research|
|Publication status||E-pub ahead of print - Aug 2020|