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Development of a High-Density, High-Strength, Cementitious Grout Using Colloidal Silica Nano-Particles
This paper describes the development of a high-strength, high-density cementitious rock-matching grout mixture for use in a field project. This portland cement-based grout incorporated silica nano-particles in the form of an ultra-fine amorphous colloidal silica (UFACS) along with hematite fine aggregate, silica fine aggregate, silica fume, water, and other chemical admixtures to match as closely as possible the given in-situ high-strength rock properties at a given field site. The chemical admixture, UFACS, was used as a viscosity-modifying chemical admixture to prevent aggregate segregation and replaced sodium bentonite clay, which frequently leads to a decrease in unconfined compressive strength. The resultant rock-matching grout (RMG) mixture was then placed in the field with over 65 individual batches to fill the annular space surrounding instrumentation packages previously placed in drilled boreholes. The resultant mechanical properties of this field-placed RMG included unconfined compressive strengths of 91.2 MPa, hardened densities of 2.68 g/cm3, and ultrasonic pulse velocities of 4.40 km/sec.
Development of a High-Density, High-Strength, Cementitious Grout Using Colloidal Silica Nano-Particles
This paper describes the development of a high-strength, high-density cementitious rock-matching grout mixture for use in a field project. This portland cement-based grout incorporated silica nano-particles in the form of an ultra-fine amorphous colloidal silica (UFACS) along with hematite fine aggregate, silica fine aggregate, silica fume, water, and other chemical admixtures to match as closely as possible the given in-situ high-strength rock properties at a given field site. The chemical admixture, UFACS, was used as a viscosity-modifying chemical admixture to prevent aggregate segregation and replaced sodium bentonite clay, which frequently leads to a decrease in unconfined compressive strength. The resultant rock-matching grout (RMG) mixture was then placed in the field with over 65 individual batches to fill the annular space surrounding instrumentation packages previously placed in drilled boreholes. The resultant mechanical properties of this field-placed RMG included unconfined compressive strengths of 91.2 MPa, hardened densities of 2.68 g/cm3, and ultrasonic pulse velocities of 4.40 km/sec.
Development of a High-Density, High-Strength, Cementitious Grout Using Colloidal Silica Nano-Particles
Green, Brian H. (author)
Proceedings of the Fourth International Conference on Grouting and Deep Mixing ; 2012 ; New Orleans, Louisiana, United States
Grouting and Deep Mixing 2012 ; 1850-1858
2012-08-17
Conference paper
Electronic Resource
English
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