Air void system parameters and frost resistance of air-entrained concrete containing calcareous fly ash
Journal Title: Roads and Bridges - Drogi i Mosty - Year 2013, Vol 12, Issue 1
Abstract
The paper presents results of the investigation of the air void characteristics and the resistance to cyclic freezing and thawing of air-entrained concrete containing calcareous fly ash. The frost resistance was tested also under the presence of de-icing salts to check the resistance to frost-salt scaling and without de-icing salts. The range of investigation included air entrained concrete mixes with the specified water-binder ratio of [i]w[/i]/[i]b[/i]=0.45 with addition of calcareous fly ash or made using blended cements with calcareous fly ash (W), and also siliceous fly ash (V) and ground granulated blast-furnace slag (S). The coarse aggregates used were crushed granodiorite and crushed limestone. The air-void system parameters were determined by microscopic image analysis and the effect of addition of calcareous fly ash was assessed. The effect of concrete age and presence of fly ash W on the strength and freeze-thaw resistance was also studied. The tests have shown that the use of calcareous fly ash as one of the main constituents of blended cements does not affect the frost salt scaling resistance nor the resistance to internal frost damage provided that the air void system is adequate.
Authors and Affiliations
Mariusz Dąbrowski, Michał Glinicki
Analiza eksperymentalna wyboczenia niesprężystego prętów stalowych poddanych korozji w komorze mgły solnej
W pracy przedstawiono badania doświadczalne wyboczenia niesprężystego skorodowanych prętów stalowych. Proces korozji zachodził w komorze mgły solnej przez okres 16 dób. Próby wyboczenia przeprowadzono w maszynie wytrzyma...
Zmiany promienia krzywizny powłoki mostowego obiektu gruntowo-powłokowego podczas budowy
Artykuł dotyczy mostowych obiektów gruntowo-powłokowych o kolistym kształcie górnej części przekroju poprzecznego powłok, wykonanych ze stalowej blachy falistej. Podczas układania zasypki gruntowej powłoka ulega wypiętrz...
Laboratory research and full scale testing of high modulus asphalt concrete in road pavement
The paper presents the development of high modulus concrete AC WMS in Poland. First implementation of AC WMS was in 1997 in Poznań. In 2002 the first edition of guidelines for high modulus asphalt concrete was published...
Application of FTIR ATR method to examine the polymer content in the modified bitumen and to assess susceptibility of bitumen to ageing
The infrared spectroscopy is suitable for the assessment of chemical compounds based on the plots of light intensity as a function of wavelength within the infrared range of electromagnetic spectrum. It enables the finge...
Influence of loading time on subgrade parameters derived from VSS static plate test
Achieving the required bearing capacity of a road subgrade during VSS static plate measurements is very often problematic in the contemporary road engineering execution. The problems arise during the test due to passing...