Title: Effect of Different Zeolites on Conversion-Prevention in High-Alumina Cement Products

Author(s): Jian Ding, Yan Fu, and J. J. Beaudoin

Publication: Materials Journal

Volume: 94

Issue: 3

Appears on pages(s): 220-226

Keywords: compressive strength; conversion; high alumina cement; hydrogarnet; temperature; sodium sulfate; straetlingite; zeolite;

DOI: 10.14359/302

Date: 5/1/1997

Abstract:
Hydration and strength development characteristics of high-alumina cement (HAC) containing sodium sulfate and a variety of different zeolites were studied. The zeolites obtained from different sources included different types containing clinoptilolite, chabazite, stilbite, and natrolite. The one-day compressive strength of HAC mortars containing a commercially available zeolite and sodium sulfate was as high as 60 MPa. No strength reduction occurred in the HAC mortars water-cured at 38 C for 330 days. Hydrogarnet formation was significantly inhibited. Clinoptilolite or chabazite-based zeolites in combination with sodium sulfate were more effective in preventing the formation of hydrogarnet in HAC paste than stilbite or natrolite-based zeolites. Zeolite alone was not able to prevent the hydrogarnet formation in the HAC paste. Chabazite was the most effective zeolite in promoting str tlingite formation in the HAC paste.