The article analyzes the effect of plasticizing admixture content on the physical and mechanical properties of concrete made of 50 % coarse aggregate. The plasticizer dosage levels proposed by the manufacturer (0.2 %-1.2 %) were examined and the optimum plasticizer dose (0.8 %-1.0 %) was established. The use of limestone Portland cement and the optimum content (0.8 %-1.0 %) of plasticizing admixture in the production of concrete increases the compressive strength, density, frost resistance, whereas the water absorption is reduced. The test results have revealed that plasticizing admixture insufficient or overdosing can reduce the physical-mechanical properties of concrete. With the optimum content of plasticizing admixture durable and frost resistant concrete can be obtained.
Santrauka. Betonas -medziaga, kuri sumaisius riSarn^^ medziagq, stambiuosius ir smulkiuosius uzpildus, vandenj bei pridèjus priedi}, reikiamij savybii} jgyja kietèdama. Betonui gaminti naudojamij zaliavij kokybé ir savybès, V/C santykis, miSinio sutankinimo vienodumas lemia pagrindines betono savybes. Betono gtiiuzdymo stipris yra viena is svarbiausiij betono savybiij. Straipsnyje nagrinèjamas plastifikatoriaus poveikis betono savybéms, parenkamas optimalus jo kiekis. Atlikus betono savybiij tyrimus su skirtingais kiekiais plastifikatoriaus, nustatj^, kad betone didinant plastifikatoriaus kiekj, didèja bandiniij gniuzdymo stipris, tankis ir ultragarso impulso sklidimo greitis, o jmirkis mazéja. Pagal gautus tyrimo rezultatus nustatyta, kad nepakankamas plastifikatoriaus kiekis arba jo perdozavimas gali pabloginti betono savybes ReikSminiai zodziai: betonas, klintinis cementas, plastifikatorius, gniuzdymo stipris, struktOrinès savybes, jmirkis.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.