Durability Improvement of Cement Binders against Alkali Deterioration of Glass Fiber Embedded in Mortar or Acid Attack in Sewerage by Incorportating with Blast Furnace Fume

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Title: Durability Improvement of Cement Binders against Alkali Deterioration of Glass Fiber Embedded in Mortar or Acid Attack in Sewerage by Incorportating with Blast Furnace Fume

Author(s): A. Yonekura, H. Ito, S. Wakasugi, S. Goto, S. Numata, and H. Maeda

Publication: Special Publication

Volume: 228

Issue:

Appears on pages(s): 1493-1508

Keywords: alkali resistance; blast furnace fume; blast furnace slag;glass fiber; glass fiber reinforced mortar; mass change; silica fume;sulfuric acid resistance

Date: 6/1/2005

Abstract:
This study deals first with the deterioration of glass fiber in mortar due to the alkali of cement and how to improve the deterioration of the glass fiber in mortar using special admixture of blast furnace fume (BFF). The deterioration is estimated by an accelerated test for flexural strength of mortar stored in water at 80 °C for 3 weeks. Secondly, the deterioration of mortar due to sulfuric acid attack using blast furnace fume(BFF) is investigated. Dust collected from the top of Chinese small-sized iron blast furnaces is called BFF in Japan , and is used as admixture for high strength concrete in China. BFF is composed of very fine particles with spherical shape. Its average grain size is several micrometers in diameter. Test results of this first study shows that the deterioration of glass fiber in mortar due to alkali is not improved by using BFF alone but is significantly improved by using both BFF and blast furnace slag (BFS) or silica fume (SF). Concerning acid attack, it is found that the deterioration of mortar in dilute sulfuric acid is significantly decreased by using both of BFF and BFS or SF.