Determination and Verification of Strength and Stiffness Properties of Grouted Soil-Video

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A Vienna University of Technology research project (2010–2015) investigated how to predict the strength and stiffness of cement grouts and permeation-grouted soils. Because water–cement ratio does not account for sedimentation and filtration, it proved unreliable as a strength predictor. Using an adapted Powers–Brownyard model, the researchers found that grout dry density provides a useful indicator of hardened-grout strength.<br /><br />For grouted soils, they developed a method to estimate cement content from sample volume and mass loss on heating, accounting for the soil’s own loss on ignition. Laboratory and field tests showed that cement content largely governs strength and stiffness. Strength and stiffness were linearly related, while cement content correlated linearly with stiffness but nonlinearly with strength. At higher cement contents, grouted soil behaved more like concrete; at lower contents, more like soil. Field trials produced sufficiently uniform grouted bodies and high-quality samples, supporting the use of cement-content measurements to estimate grouted-soil strength in practice.

Keywords

Vienna University of Technology

cement grout

grouted soils

strength prediction

stiffness

cement content