Effect of Air-Entraining Agent LHD on the Technological Properties of Concrete Mix Containing Superplasticizer S-3

Abstract

Investigated coeffect of superplasticizer S-3 and air-entraining agents LHD (wood chemical additive) on workability, cohesion and air entrainment of concrete mix. Found that under introducing an additive LHD into the concrete mix comprising supeplastifikator S-3, the mobility of the concrete mix is reduced despite the fact that the additive LHD itself is a plasticizer. Decreased mobility from the introduction 0.1 % LHD makes: slump Abrams - 5-6 %, slump flow - 18-22 %. At the same time LHD additive contributes significantly air entrainment and reduce separating water and mortar. Effect of increasing the connectivity of the concrete mix associated with air entrainment. Regardless of the LHD additive S-3 additive does not reduces water separating, and does not have air-entraining action, and virtually no effect on air entrainment caused by the addition of LHD. With increasing content in the concrete mix additives LHD regardless of dosage S-3 amount of entrained air increases from 3 to 7%, and water separation is reduced to almost 0. Thus, synergy additives S-3 and LHD against plasticize the concrete mix was negative, but a positive effect has been observed in respect of connectivity concrete mix.