LONG TERM EXPOSURE OF PORTLAND LIMESTONE CEMENT CONCRETE, CONTAINING OR NOT MINERAL ADMIXTURES, IN COMBINED CHLORIDE AND SULFATE ENVIRONMENT

článek ve sborníku ve WoS nebo Scopus

angličtina

In this paper the long term behaviour of limestone cement concrete, stored in chloridesulfate environment, was investigated. Concrete specimens were prepared by using an ordinary Portland cement and two different Portland limestone cements, as well as natural pozzolana, fly ash, blastfurnace slag or metakaolin, and were stored in solutions of various sulfate and chloride contents at 5 o C. Visual assessment, mass measurements and XRD analysis took place. The higher contents of limestone in cement and of sulfate in storage solutions resulted in more intensive concrete damage. Thaumasite was the main deterioration product. The use of mineral admixtures improved the behaviour of limestone cement concrete. After 24 months of exposure, chlorides delay the deterioration of limestone cement concretes caused by sulfates. After 55 months, the presence of chlorides led to a greater mass loss. The specimens containing mineral admixtures showed more intensive deterioration at 24 months when chlorides were present along with sulfates. Their mass was not be affected by chlorides. Fly ash was the most efficient material to improve limestone cement concrete's performance. Concrete with metakaolin suffered from significant damage after 55 months.

Durability, limestone cement, sulfate atack

SOTIRIADIS, K.; KOSÍKOVÁ, J.; PETRÁNEK, V.

2012

6. 12. 2012

VUT v Brně

Brno

978-80-214-4657-1

Proceedings of the Conference on the Rehabilitation and Reconstruction of Buildings CRRB 2012

96

105

10