Sulfate Resistance in Cements Bearing Ornamental Granite Industry Sludge

Materials

Gabriel Medina¹  MaríaIsabel Sánchez de Rojas²  Moisés Frías²  IsabelF. Sáez del Bosque³  César Medina⁴ 

[1] Departamento Ingenierías Mecánica, Informática y Aeroespacial, Escuela de Ingenierías Industrial e Informática, Campus de Vegazana, Universidad de León, s/n, 24071 León, Spain;Departamento de Cementos y Reciclado de Materiales, Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc-CSIC), Sostenibilidad en Materiales de Construcción, Universidad de Extremadura, Unidad Asociada al CSIC, 28033 Madrid, Spain;Departamento de Construcción, Escuela Politécnica de Cáceres—Grado de Ingeniería Civil, Universidad de Extremadura, Instituto de Investigación de Desarrollo Territorial Sostenible (INTERRA), 10003 Cáceres, Spain;Departamento de Construcción, Escuela Politécnica de Cáceres—Grado de Ingeniería Civil, Universidad de Extremadura, Sostenibilidad en Materiales de Construcción, Universidad de Extremadura, Unidad Asociada al CSIC, Instituto de Investigación de Desarrollo Territorial Sostenible (INTERRA), 10003 Cáceres, Spain;

关键词: sulfate;    granite dust;    durability;    binary cements;    performance;   

DOI  :  10.3390/ma13184081

来源: DOAJ

【 摘 要 】

This study explores the effect on sulfate resistance of the use of ornamental granite industry waste as a supplementary cementitious material (at replacement ratios of 10% and 20%) in cement manufacture. The present paucity of scientific knowledge of the behaviour of these new cements when exposed to an external source of sulfates justifies the need for, and the originality of, this research. After characterising the waste chemically and mineralogically, cement paste specimens were prepared in order to determine the durability of the newly designed eco-cements using Köch–Steinegger corrosion indices. The new hydration products, which might induce microstructural, mineralogical, or morphological decay in the specimens, were also analysed by comparing the samples before and after soaking in a sodium sulfate solution for different test periods. Respect to the results, the damage to pastes bearing 10% granite sludge (GS) is the same as observed in OPC, whilst the former exhibit a higher Köch-Steinegger corrosion rate (1.61) than both OPC and OPC+20GS. Soaking the pastes in sodium sulfate induces matrix densification due to ettringite formation and gypsum precipitation in the pores. Further to those results, at an optimal replacement ratio of 10%, these alternative, eco-friendlier materials can be used in the design and construction of non-structural cement-based (mortar or concrete) members exposed to an external source of sulfate.

【 授权许可】

Unknown