This report is divided into two parts: Portland and Sorel Cements. Portland Cement: The production of doped belite (dicalcium silicate) clinkers can be a prospective way of saving energy in cement production. Barium sulfate (BaSO sub-4), calcium tribasic phosphate (Ca sub-5 (PO sub-4) sub-3 (OH), and vanadium oxide (V sub-2 0 sub-5) stabilize Beta-, alpha' and alpha modifications of belite (C sub-2 S). The aplha' modification shows better strength development than the Beta-C sub-2 S. Strength develops more slowly in Ca sub-5 (PO sub-4) sub-3 OH than in BaSO sub-4, stabilized belites. Also, belite clinkers doped with BaSO sub-4 attain greater strength than belites without BaSO sub-4. Sorel Cement: The reaction products are dependent on the proportion of reactants (MgO, MgC1 sub-2, and H sub-2 O) and on MgO activity. Hardened cements achieve the best strength development and stability when phase 5 (5Mg (OH) sub-2 .MgC1 sub-2 .(H sub-2 O) is the main reaction product. Phosphate addition, especially soluble phosphates, which are more effective, improves the cement's resistance to the effects of water.
This study consisted of a laboratory evaluation of the effect of microsilica on the physical properties of both plastic and hardened portland cement c...
Links with this icon indicate that you are leaving a Bureau of Transportation
Statistics (BTS)/National Transportation Library (NTL)
Web-based service.
Thank you for visiting.
You are about to access a non-government link outside of
the U.S. Department of Transportation's National
Transportation Library.
Please note: While links to Web sites outside of DOT are
offered for your convenience, when you exit DOT Web sites,
Federal privacy policy and Section 508 of the Rehabilitation
Act (accessibility requirements) no longer apply. In
addition, DOT does not attest to the accuracy, relevance,
timeliness or completeness of information provided by linked
sites. Linking to a Web site does not constitute an
endorsement by DOT of the sponsors of the site or the
products presented on the site. For more information, please
view DOT's Web site linking policy.
To get back to the page you were previously viewing, click
your Cancel button.
United States Department of Transportation
[PDF-5.57 MB]
