Effect of Dosage of Redispersible Powders on the Properties of Fine Concrete

Abstract

The RPP introduction has been established up to 3% by weight of the dry concrete mix is ​​accompanied by a decrease in the fine-grained concrete tensile strength in compression to 40% and in tension during bending to 15%. The relationship between the tensile strength limit in bending and compression for the studied materials is invariant to the cement and RPP type. With the concrete tensile strength in tensile bending increase, there is a weak tendency to a decrease in the adhesion ratio value to the concrete base and tensile strength. The adhesion amount to the concrete base with RPP increasing dosage can either increase or decrease after a certain limit, depending on the cement properties. The maximum increase in adhesion to the concrete base was 37%, while the decrease in the concrete elasticity initial modulus was 26%.

Improving the Structural Characteristics of Heavy Concrete by Combined Disperse Reinforcement

“…The addition of synthetic fibers to the concrete mixture does not lead to a noticeable increase in the strength of the composite for axial tension, elongation in bending, and compression under the action of static loads, since concrete cannot transfer static forces to fibers, which have a lower modulus of elasticity compared to concrete. However, despite the low values of elastic characteristics, in comparison with steel, polypropylene fibers are still of great interest in terms of their use for dispersed reinforcement [37][38][39][40][41][42].…”

Methodology for the selection of the composition for the production of products of hard-pressed concrete with industrial wastes

“…Indirect attributes of the optimal water content of the molding sand are its non-stickiness to the working bodies of the mixer and the absence of water separation at the selected pressing pressure [12,13].…”