To the problem of the methodology for evaluating the effectiveness of the use of superplasticizers in concretes

Abstract

Abstract Based on the analysis of the effect of various superplasticizers on the compressive and tensile strengths of concrete hardened under different conditions for three months, it was concluded that to estimate the effectiveness of superplasticizers it is not enough to compare the relative strength indicators of concrete only (f90/f28; ft = f(f); f = f(W/C)) without taking into account the effect of the superplasticizer on the water content in the concrete mix and the cement content. The assessment methodology is given. It is shown that provided the required design parameters for durability are ensured, analysis of only data on the increase in compressive and tensile strengths in time can lead to erroneous conclusions. A reliable assessment should be made taking into account the influence of the superplasticizer on the composition and cost of the concrete mix, shrinkage, creep and E-modulus of concrete.