Using aluminum cement in the manufacturing of self-flowing, non-shrink grout with compressive strength of 70 MPa

Abstract

High-strength, self-flowing non-shrinkage grout are widely used in the repair of reinforced concrete structures. Repair mortar should be non-shrink when hardened to avoid cracks. Conventional mortar has a large dry shrinkage value, so it is necessary to add an expanding additive to reduce shrinkage. This article presents the results of a study on the shrinkage reduction effect of alumina cement, in the manufacturing of self-flowing non-shrinkage grout with a compressive strength after 28 days of 70 MPa. The materials are all in the form of fine powder with a mixing ratio equivalent to the grout commonly sold on the market. The water/powder ratio is 0.13 and polycarboxylate superplasticizer with a content of 0.25% compared to the binder. The experimental results on flow, compressive strength, flexural strength and shrinkage showed that the studied mortar met the requirements of bagged, self-flowing non-shrinkage mortar.

Keywords: Grout, Alumina cement, Self-flowing, Non-shrink.