257 KB27 KB200020242013Belas, NadiaBendani, KarimBouhamou, Nasr-EddineMebrouki, Abdelkaderletnik:47številka:6str. 763-769COBISSID:1026986ISSN:1580-2949URN:URN:NBN:SI:doc-JNKNS58RenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijekrčenjemehanske lastnostimikrostrukturapolnilasamozgoščevalni betonShrinkage behavior of a self-compacting concrete| Vedenje samozgoščevalnega betona pri krčenju|This paper presents the influence of the mixing constituents on the behavior of self-compacting concretes (SCCs), especially, the effect of the paste volume in their fresh and hardened state. It explains the roles of the pore network and the microstructure of the hydrates in drying and autogenous shrinkage of SCCs. Several tests such as slump flow, L-box, sieve stability, bleeding, mechanical strength, free shrinkage (drying and autogenous shrinkage) and microstructural tests (mineralogical characterization, porosimetric distributions) were carried out in order to understand the roles played by various components likely to influence the formulation of an SCC. The results obtained offer interesting prospects to optimize a SCC using local materials in Algeria. This study has allowed the development of various SCC formulations that fulfill the rheological criteria such as good deformability, low bleeding, low segregation and a better mechanical performanceČlanek opisuje vpliv primešanih dodatkov na vedenje samozgoščevalnega betona (SCC) na volumen v svežem in v strjenem stanju. Razložena je vloga mreže por in mikrostrukture hidratov pri sušenju in avtogenem krčenju SCC. Da bi razumeli vlogo posameznih delov in sestavin, ki opredeljujejo SCC, je bilo izvršenih več preizkusov, kot pojemanje toka, L-Box, stabilnost pri sejanju, izcejanje, mehanska trdnost, prosto krčenje (sušenje in avtogeno krčenje), mikrostrukturni preizkusi (mineraloška karakterizacija, razporeditev por). Dobljeni rezultati dajejo zanimive možnosti za optimiranje SCC z uporabo lokalnih mineralov v Alžiriji. Ta študija je omogočila različne formulacije SCC, ki izpolnjujejo reološka merila, kot je dobra deformabilnost, manj izcejanja, manj segregacij in boljše mehanske zmogljivostiTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije