The compressive strength of concrete retrofitted with wind ash and steel slag pozzolans with a water-cement based polymers

Cai T. Zandi Y. Agdas A.S. Selmi A. Issakhov A. Roco-Videla A.
June 2021 Techno-Press

Advances in Concrete Construction
2021 #11 Issue 6 507 - 519 pp.

Freeze and thaw phenomena in cold regions are the main cause of severe damage to concrete structures. Alkaliactivated slag repair mortars, which are introduced as a suitable material for the replacement of Portland cement, can be used as the protective coating for these damaged structures. The mechanical properties and durability of this coating layer should be studied. In this study, the mechanical properties and durability of alkali-activated slag repair mortars with silica fume (SF) participation as inorganic additives against freeze-thaw and salt scaling attacks have been investigated. In order to evaluate the effects of alkaline activators type, the ratio of these solutions to Pozzolan (Pozz), and the use of SF as a substitute base material, these three factors were considered as the main variables to produce 12 alkali-activated slag mortar mixtures. To investigate their mechanical properties, compressive strength, tensile adhesion strength, and drying shrinkage tests were conducted. Also, mortar specimen length change, compressive strength loss, weight loss, and dynamic elastic modulus were measured to evaluate the durability features against freeze-thaw and salt scaling attacks. According to the results, in addition to higher compressive strength and adhesion resistance of alkali-activated slag repair mortars, these mortars showed at least 30% better durability against freeze-thaw and salt scaling attacks than cement-based repair mortar. Also, alkali-activated slag mixtures containing potassium hydroxide, alkaline solution (AS) to Pozz ratio of 0.7, and SF had the best mechanical properties and frost resistance among all mixtures.

ash , compressive strength , iron slag , pozzolanic concrete , steel slag pozzolans , water-cement based polymers , wind ash

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School of Information Engineering, Xizang Minzu University, Xianyang, 712082, Shaanxi, China
Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
Ghateh Gostar Novin Company, Tabriz, Iran
Department of Civil Engineering, College of Engineering, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Saudi Arabia
Civil Engineering Laboratory, Ecole Nationale D’Ingénieurs deTunis (ENIT), B.P. 37, Lbelvédère, Tunis, 1002, Tunisia
Al-Farabi Kazakh National University, Almaty, 1002, Kazakhstan
Kazakh-British Technical University, Almaty, Kazakhstan
Programa Magister en Ciencias Químico-Biológicas, Facultad de Ciencias de la Salud, Universidad Bernardo O´Higgins, Santiago, Chile
Departamento de Ingeniería Civil, Facultad de Ingeniería, Universidad Católica de la Santísima Concepción, Concepción, Chile

School of Information Engineering
Department of Civil Engineering
Ghateh Gostar Novin Company
Department of Civil Engineering
Civil Engineering Laboratory
Al-Farabi Kazakh National University
Kazakh-British Technical University
Programa Magister en Ciencias Químico-Biológicas
Departamento de Ingeniería Civil

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