Cement grouting, also known as slurry grouting or high mobility grouting, is a grouting technique that fills pores in granular soil or voids in rock or soil, with flowable particulate grouts. Depending on the application, Portland cement or microfine cement grout is injected under pressure at strategic locations either through single port or multiple port pipes. The grout particle size and soil/rock void size must be properly matched to permit the cement grout to enter the pores or voids. The grouted mass has an increased strength and stiffness, and reduced permeability. The technique has been used to reduce water flow through rock formations beneath dams and to cement granular soils to underpin foundations or provide excavation support.
For underpinning applications, cement grouting may offer an economic advantage over conventional approaches such as removal and replacement, or piling, and can be accomplished where access is difficult and space is limited. Since the effectiveness of cement stabilization grouting is independent of structural connections, the technique is readily adaptable to existing foundations. Usually, cement grouting can be accomplished without disrupting normal facility operations.
Hayward Baker has developed proprietary special equipment and software (iGroutTM), to allow real-time monitoring of all grouting parameters during the cement grouting process. The operator can adjust the real time cement grouting parameters, such as mix type, flow rate, pressure, and volume limits based on the real time acquisition of drilling and grouting data, while simultaneously monitoring for any movements or deflections of the ground or nearby structures. Data collected during drilling and grouting is recorded on a server which produces grouting reports as well as CAD profile drawings. Use of this advanced monitoring and control system increases accuracy and efficiency of the cement grouting.