Use of Rhenish trass in marine concrete: A microscopic and durability perspective

Heron

M.R. de Rooij¹  R.B. Polder¹  T.G. Nijland¹  J.A. Larbi¹ 

[1] TNO Built Environment and Geosciences, The Netherlands $$

关键词: Marine concrete;    trass;    microscopy;    resistivity;    durability;    field experience;    ASR;   

DOI  :  

学科分类：建筑学

来源: Technische Universiteit Delft * Faculty of Civil Engineering

【 摘 要 】

Use of Rhenish trass in (historic) lime mortars is well known. However, its application to concrete has not been investigated elaborately. In the past, trass was used as a pozzolanic addition to concrete for marine structures in the Netherlands. Recent investigations of several structures have shown that identification of trass in aged concretes by polarization-and-fluorescence microscopy isdifficult. In order to facilitate PFM studies, historic mixtures were recast. Two mixtures have been recast, viz. a mixture of 300 kg/m3 ordinary Portland cement (CEM I) and another mixture of 310 kg/m3 ground granulated blastfurnace slag cement (CEM III/B), both with an addition of 10% trass by cement mass. Concrete mixes were originally designed for a major lock, built in the 1920`s, and a quay constructed in Rotterdam harbour in the 1970`s, respectively. Difficulties of recognizing trass in aged concretes by PFM and apparent effects of trass on both microstructure of the concrete and durability arediscussed. Durability in a maritime environment has extensively been studied in the case of Rotterdam harbour. It is shown that addition of 10% of trass to CEM III/B has no effect on the durability of concrete.

【 授权许可】

Unknown