Effect of seawater in grout on the mechanical behavior of cement stabilized marine sand

Document Type : Research Article

Authors

Department of civil engineering, university of Qom

Abstract

One of the challenges in the field of geotechnical engineering is the sustainable development of soil improvement methods in marine environments due to severe environmental conditions such as high salinity. Implementation of soil-cement columns using deep mixing method and jet-grouting methods is an effective way to deal with problems caused by low resistance of coastal problematic soils. What is common in the implementation of these columns in the engineering community is the need to use fresh water to make the grout used in these columns. This, both from the point of view of its supply and transportation costs and from the lack of fresh water in many areas, imposes high costs on projects and time delays. However, prior to the final cement retention, the saline water present in the environments of the columns was mixed with the fresh water in the grout as they were built deep in the soil. Investigating the feasibility of using seawater in mixing these columns and evaluating the behavior of soil-cement samples in marine conditions has received little attention. In this study, it has been attempted to investigate the effective factors in the grout mixing scheme, including water salinity, cement percentage, water-cement ratio and processing time on uniaxial compressive strength and sand-cement tensile strength. SEM images were also microstructurally evaluated for sample behavior. The results show that in the 15% to 25% cement content, the use of seawater in grout production does not decrease the strength of sand-cement samples in the marine environment. The obtained compressive strength range for sand-cement samples made with seawater is approximately (1.5 to 6) MPa and the tensile to compressive strength ratio of these samples is in the range (0.15 to 0.3).

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 6
September 2021
Pages 2277-2296

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