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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Durability of Cement Matrices Used for Stabilization of Hazardous Wastes
Author(s): J. Madrid, J. M. Diez, S. Goiii and A. Marcias
Publication: Special Publication
Appears on pages(s): 1527-1550
Keywords: Acids; blast furnace slag; cadmium; durability; lead (metal); seawater;
Abstract:The durability of cement-stabilized specimens in various aggressive media were studied by means of the Koch and Steinegger test over 56 days at 20°C. Prismatic lxlx6cm samples of normal portland cement (OPC) and normal portland cement with 80% ground granulated blast furnace slag (OPC/BFS) addition, were prepared mixing them with water containing 5,000 ppm Pb2+ (OPC samples), 15,000 ppm Pb2+ (OPC/BFS samples) or 50,000 ppm Cd 2+. Those specimens were immersed in the aggressive solutions tested: a buffered AcH/Ac- medium, a NaCl 0.45M + Na2SO4 0.03M solution (SO4= and Cl- concentrations equivalent to those of the sea water) and deionized water as reference. In addition, the concentration of toxic metals in the aggresive media. was measured I Changes into microstructure and flexural strength were evaluated by X-ray diffraction (XRD) and mercury intrusion porosimetry (MIP). The pore fluid solution extracted from specimens and the leachate solutions were analyzed for Pb2+, Cd2+, Ca2+, Na+,K+, SO4 and Cl-ions. Results show that normal portland cement and blast furnace slag blended cements are durable matrices in saline medium similar to sea water, but undergo an acid attack with formation of a porous degradation coating and dissolution of toxics metals in the acid medium of AcH/Ac- buffer solution.
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