Fine-Grained High-Strength Concrete

Abstract

The factors determining the production of fine-grained high-strength concrete are considered. The effect of micro-and complex nanodisperse additives based on natural mineral components, as well as the packing density of the quartz aggregate, on the strength parameters of fine-grained concrete is studied. The compositions of the fine-grained concrete modified by micro-and complex nanodisperse additives have been developed. The dependence of the fine concrete strength on the ratio of the mineral component and the stabilizer in the nanodisperse additive and the time of ultrasonic dispersion and additive storage is analyzed. The stabilization mechanisms of water dispersions of complex nanodisperse additives by various surface active modifiers are considered. The positive role of ultrasonic dispersion in obtaining nanodispersed additives is shown. The application efficiency of the micro-filler improving the density and strength of fine-grained concrete is revealed. The structure of fine-grained concrete is studied. It has been established by scanning electron microscopy that the introduction of the micro-and nanodispersed additives in the concrete leads to a less defective crystalline structure of the material.

Experimental Investigation on Short-term Properties of High-flowing Fine-grained Concrete Applying for Marine Structures

“…A use of superplasticizer (SP) and mineral additives (e.g. fly ash (FA), slag, and so on) supports not only to decrease the cement content but also to improve engineering properties including strength, workability, water resistance, shrinkage, porosity, and so on of fine-grained concretes [4]. Moreover, the positive role of nano-sized additives in the improvement of the properties of various types of concrete including fine-grained concretes was found in some previous studies [5], [6].…”