JOURNAL OF ROCK MECHANICS

JOURNAL OF ROCK MECHANICS

Experimental study on temperature effect on the tensile fracture toughness of cement mortars containing micro-silica

Document Type : Original Article

Authors
Hamed Molladavoodi
Alireza Dolatshahi
Mehdi Arash
Mohammad Mehdi Mashayekhi
Dept. Mining Engineering, Amirkabir University of Technology, Tehran, Iran.
10.22034/IRSRM.2024.515881.1026
Abstract
Given the importance of cement-based structures such as concrete and cement mortar in civil and mining engineering, special attention is always paid to the fracture mechanics of these materials under different environmental conditions. One of the most important parameters of fracture mechanics is the resistance to crack growth. Semi-brittle materials such as stone and cement-based materials operate in weak tension, and evaluating various factors on the critical stress intensity factor of the tensile state of these materials always allows researchers and engineers to have successful designs and projects. In this study, the effect of different temperatures such as -10, 25, 50 and 100 degrees Celsius on the fracture toughness of 3 types of cement mortars reinforced with micro-silica pozzolan with a replacement percentage of 0, 5 and 10% of the weight of cement used in the cement mortar has been investigated. The results of this study showed that with increasing temperature, tensile fracture toughness decreases, and with increasing micro-silica by 5 and 10%, the resistance to tensile crack growth of cement mortar at the temperature of 100 degrees Celsius examined in this study increases by a maximum of 15.70 and 9%.
Keywords
Fracture toughness
Quasi-brittle materials
Temperature
Tensile strength
CSTBD
Subjects
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JOURNAL OF ROCK MECHANICS
Volume 8, Issue 1
Spring 2024
Pages 51-65