Grouting is a common technical method with many applications, e.g., it is used for soil stabilization and strengthening, for reduction for water ingress to underground facilities or of the water loss through a dam foundation, etc. Grouts comprise several constituents, which are combined in many ways depending on the in-situ conditions and the outcome desired. The use of very fine cement grouts for injections into fine-to-medium sands has been proposed to circumvent problems associated with the permanence and toxicity of chemical grouts and the inability of ordinary cement grouts to permeate soil formations finer than coarse sand. The strength of a suspension is the property of probably most interest in cases where the main objective of a soak injection program is to improve the mechanical properties of the soil. The object of this paper is to investigate the effect of cement physical properties, water-to-cement ratio, additives and chemical improvers on the strength of cement suspensions.