Amirkabir Journal of Civil Engineering

Amirkabir Journal of Civil Engineering

A Study on Mechanical Properties, Water Absorption, and Microstructure of Cementitious Mortar containing Recycled Admixtures

Document Type : Research Article

Authors
ghasem pachideh
majid gholhaki
Phd Candidate, civil faculty, semnan university
10.22060/ceej.2020.17110.6463
Abstract
Economic concerns and environmental issues have led to increased use of recycled materials in cementitious mortars. To mitigate the adverse effects of cement, it can be partially replaced with recycled materials. In this paper, cement was partially replaced with iron, rubber, glass, and eggshell powders (IP, RP, GP, and EP) by 7, 14, 21, and 28%. Then, compressive and tensile strength, water absorption, and microstructure of the specimens were assessed. The strength tests, as well as microstructure analysis, were conducted at the age of 28-day and the water absorption was tested at the ages of 7, 28, 56, and 90 days. Based on the results, the use of all powders by 14%, enhances the compressive strength up to 14%. Moreover, it was found that up to a replacement ratio of 28%, the tensile strength is greater than that of the control specimen although, in the case of 7% admixtures, maximum tensile strength is achieved. In addition, water absorption of the specimens containing GP and EP up to 35% replacement ratio, is less than that of the other specimens, which was well observed in the SEM analyses.
Keywords
Cement mortar
Waste pozzolan
Mechanical properties
Water absorption
SEM
Subjects
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Amirkabir Journal of Civil Engineering
Volume 53, Issue 5
August 2021
Pages 1743-1762