Andrej Ivanič (Author), Samo Lubej (Author)

Abstract

Najpomembnejši parameter, ki vpliva na lastnosti vlaknastih cementnih kompozitov, je kvaliteta vezi v stični coni med matrico in vlakni. Članek obravnava vpliv mikrosilike in superplastifikatorja na povečanje trdnosti stika med cementno malto in snopičem kontinuiranih ogljikovih vlaken. Analiza mikrostrukture z elektronskim vrstičnim mikroskopom je pokazala, da je dodatek mikrosilike zmanjšal poroznost in količino CH kristalov in tako utrdil stično cono in ojačal vpetje vlaken. Dodatek superplastifikatorja je sicer izboljšal obdelovalnost sveže malte, kar pa ni bistveno vplivalo na izboljšanje kvalitete vpetja. Trdnost stika je bila kvantitativno ovrednotena z rezultati izvlečnih testov,ki so pokazali, da se z dodatkom kombinacije mikrosilike in superplastifikatorja doseže največje izboljšanje stika med cementno matrico in ogljikovimi vlakni.

Keywords

gradbeni materiali;cementni kompoziti;trdnost stika;kontinuirana ogljikova vlakna;

Data

Language: Slovenian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
Publisher: Zveza društev gradbenih inženirjev in tehnikov Slovenije
UDC: 691.32:620.16
COBISS: 13055766 Link will open in a new window
ISSN: 0017-2774
Parent publication: Gradbeni vestnik
Views: 917
Downloads: 24
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Other data

Secondary language: English
Secondary title: Bond improvement in cementitious mortars reinforced with continuous carbon filaments
Secondary abstract: Among various parameters that influence the properties of the composite, the bond between the cementitious matrix and the fibres is the most important one. This paper investigates the influence of admixtures - silica fume and superplasticizer - on the improvement of the bond strength between bundled carbon filaments and cementitious mortars. An overall microstructural analysis has shown that the addition of silica fume strengthen the interfacial transition zone by both the reduction of its porosity and the consumption of CH crystals. The addition of a superplasticizer increased the workability of fresh mortars but the improvement of the bond strength was not significant. Fibre-bundle pull-out tests were caried out to confirm the effectiveness of the admixtures to improve the bond strength. Based on the resulting load-displacement curves, the combination of silica fume and superplasticizer were found to be the most effective in improving the bond strength of the composite.
URN: URN:NBN:SI
Type (COBISS): Not categorized
Pages: str. 16-22
Volume: ǂLetn. ǂ58
Issue: 1
Chronology: jan. 2009
ID: 1733684