Deep soil mixing is considered as an in situ ground treatment in which native soils are mixed with cementitious materials, usually called as binders. DSM is a versatile technique for ground development. Since the development of this method, the binders conventionally used have been Ordinary Portland Cement and lime. In the present study, an attempt was made to develop sustainable binders for ground improvement of loose sand with an emphasis on deep soil mixing columns. The effect of curing and the optimum water for the binder was also explored. The binder was able to impart binding properties between sand particles. The unconfined compressive test results of the sample made using the binder and sand show that the strength of the sample is 2542.2 kN/m2. The UCS tests done of three samples having various water contents of 15, 18, and 21% at 7-day and 28 day curing showed that the optimum molding moisture content of the binder is 18%. It was understood that the strength is affected by the method chosen for curing. The addition of this binder has produced a C–S–H gel which is responsible for this increase in the strength.

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A Sustainable Binder for Deep Soil Mixing Columns in Loose Sand

  • Megha Shankar,
  • P. V. Divya

摘要

Deep soil mixing is considered as an in situ ground treatment in which native soils are mixed with cementitious materials, usually called as binders. DSM is a versatile technique for ground development. Since the development of this method, the binders conventionally used have been Ordinary Portland Cement and lime. In the present study, an attempt was made to develop sustainable binders for ground improvement of loose sand with an emphasis on deep soil mixing columns. The effect of curing and the optimum water for the binder was also explored. The binder was able to impart binding properties between sand particles. The unconfined compressive test results of the sample made using the binder and sand show that the strength of the sample is 2542.2 kN/m2. The UCS tests done of three samples having various water contents of 15, 18, and 21% at 7-day and 28 day curing showed that the optimum molding moisture content of the binder is 18%. It was understood that the strength is affected by the method chosen for curing. The addition of this binder has produced a C–S–H gel which is responsible for this increase in the strength.