Document Type : Research Article
Authors
1
PhD candidate, Department of Civil Engineering, Qeshm Branch, Islamic Azad University, Qeshm, Iran
2
Professor, Department of Civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
3
Dep. of Civil Engineering, Amirkabir University of Technology
Abstract
One of the optimal methods for producing cement and concrete is to replace part of the cement with cheap additives. These pozzolans help reduce cement consumption, energy, and greenhouse gas emissions. They also improve the mechanical properties and durability of concrete. In this study, 11 mixing designs were made, including a reference and 10 cement-slag concrete designs. Slag powder from the Ahvaz Steel Plant was used instead of 40% cement (by weight). In five designs, scoria lightweight aggregate was used instead of part of the natural aggregate, and in the other five designs, Leca was used. These two types of lightweight aggregate were used with two curing methods with drinking water and laboratory temperature. Standard cubic and prismatic samples were used for the tests. In the mixing design, scoria and Leca lightweight aggregates were replaced by 30%, 40%, 50%, 60% and 70% with natural aggregates (pea and almond). Also, a third-generation modified superplasticizer and a polycarboxylate-based extreme water reducer were used. To determine the rheological, mechanical and durability properties, slump tests, concrete specific gravity, compressive strength, indirect tensile strength, electrical resistance, volumetric water absorption and water penetration depth were performed. The results showed that using 40% steel slag with a combination of scoria and Leca aggregates in concrete production has positive results. At the age of 91 days, the compressive strength of cement-slag concrete should not be less than the same strength as the reference concrete. Therefore, 40% replacement of slag with scoria and Leca aggregates can be considered optimal.
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