Experimental data of cement grouting in coarse soils with different superplasticisers

Area of Science:

• Civil Engineering
• Geotechnical Engineering
• Materials Science

Background:

• High-range water reducers, known as superplasticisers, are crucial in cementitious materials.
• Their application in cement grouting, particularly for soil improvement, requires detailed investigation.
• Understanding their impact on grout rheology and soil mechanics is essential for effective geotechnical solutions.

Purpose of the Study:

• To evaluate the effectiveness of two superplasticiser types (polycarboxylate ether and naphthalene condensates) in cement grouting.
• To assess the influence of these superplasticisers on the injectability of cement grouts into coarse soil.
• To determine the impact of superplasticisers on the shear strength parameters of the grouted soil.

Main Methods:

• Injectability tests were conducted on coarse soil columns using cement grouts with varying superplasticiser dosages and water-to-cement ratios.
• Grouting was performed under a range of pressures to simulate field conditions.
• Shear strength parameters of the grouted soil were measured using undrained unconsolidated triaxial compression tests.

Main Results:

• Both polycarboxylate ether and naphthalene condensate superplasticisers were found to be potentially viable for cement grouting.
• Superplasticiser dosage and water-to-cement ratio significantly influenced grout injectability.
• The addition of superplasticisers positively affected the shear strength parameters of the grouted soil.

Conclusions:

• Superplasticisers can improve the injectability and enhance the shear strength of cement-grouted coarse soils.
• The findings support the use of superplasticisers in cement grouting for geotechnical applications.
• Further research can optimize superplasticiser selection and dosage for specific soil conditions and performance requirements.