Deep Cement Mixing

The Deep Cement Mixing method is based on chemical reactions between clay and chemical agent,which is usually ordinary Portland cement.This is done by machines with rotating blades for supplying the chemical agent in to the soil and for insitu mechanical mixing of the soil with the agent.The chemical agent absorbs the pore water and reacts with clay particles to form pozzolanic products.

 A typical deep cement mixing machine consists of one or two rotating shafts with excavation blades and mixing blades driven by hydraulic or electric motor.Dual shaft system is commonly used to ensure uniform mixing and provide large excavation capacity.

After the required quantity of hardening agent is determined and excavation conditions such as penetration and withdrawal rates are confirmed by trial mixing works and laboratory testing,production ground stabilization work is taken up.The mixing machine,usually installed on track mounted rigs, will be mobilized to the specified location and the following construction sequences will be carried out to form a soil cement column in soft ground.

 1.Mixing shaft will rotate and penetrate in to the soft soil to the designed treatment depth.
2.While penetrating in to the ground,cement slurry will be injected and mixed with soft soils
3.After reaching the founding level of the soil cement column,the mixing shaft will be withdrawn.
4.While withdrawing the mixing shaft,the cement slurry and the soft soil will be mixed again to ensure uniform soil-cement mix
5.A soil -cement column is then formed and the above construction sequences will be repeated at the next location.