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Bonding between Cement Hydrates and Steel.
CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN ILL
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The bonding mechanics of steel to portland cement and its constituent compounds were studied by testing composite steelpaste bars in flexure. The interface was subsequently examined by scanning electron microscopy. Type I portland cement, tricalcium silicate, dicalcium silicate, and tetracalcium aluminoferrite exhibited strong bonding to low carbon steel tricalcium aluminate demonstrated no measurable bond strength. The primary bonding mechanism between alite paste and steel was found to be chemical in nature. No significant influence of the surface roughness of the steel on the tensile bond strength to alite paste could be established. The weak link in the steel paste bar was a high water content region concentrated near the steelpaste interface. Author
APPROVED FOR PUBLIC RELEASE