Methods of Investigating and Quality Assessing Structure of Concretes with Combined Aggregates

Abstract

Concrete on Portland cement and cement modified with expanding additives were studied. The authors present the results of study of the modified concrete with combined aggregate. Combined aggregate is a composition of natural granite and limestone crushed stone mixed with crushed concrete. Structure and properties of concrete with combined aggregate is insufficiently studied, which limits their use in civil engineering Recycling of building materials allows to expand the raw material base, to solve the problems of resource conservation and environmental protection. The regularities and causes of changes (reduction) indicators of the quality of concrete with combined aggregate. Studying of properties and laws of formation of structure of concrete at the same time is a method of control of their production. The valuation of properties of concrete with combined aggregates will allow to use them along with traditional concrete.

Repair compositions for restoration of operated reinforced concrete structures

“…This forms a very dense cement stone, in which the smallest partially sealed pores are evenly distributed. As a result, the strength indicators, water resistance and frost resistance of the resulting material are significantly increased, which is confirmed by comprehensive studies [9][10][11].…”