Journal of Concrete Structures and Materials

Journal of Concrete Structures and Materials

Evaluation of Mechanical and Thermal Characteristics of Self-Compacting Alkali Activated and Cementitious Concrete

Document Type : Original Article

Authors
shahriar abdolahzade 1
Mahmoud Nili 2
nikta loghmani 3
1 PhD of Civil Engineering, Department of Civil Engineering, Bu-Ali Sina University, Hamedan, Iran
2 Associate Professor, Department of Civil Engineering, Bu-Ali Sina University, Hamedan, Iran
3 PhD Candidate, Department of Civil Engineering, Bu-Ali Sina University, Hamedan, Iran
10.30478/jcsm.2024.433445.1355
Abstract
The development of novel concretes, such as self-compacting concrete, and employing new materials, including alkali activated slag and fly ash, seem necessary for environmental protection and sustainable development in infrastructure. In this study, alkali activated slag and fly ash are employed as an alternative eco-friendly binder to produce self-compacting concrete. Mechanical and thermal properties (using a semi-adiabatic calorimeter) of alkali activated- and cementitious-self compacting concretes with three binder contents (500–600–700 kg/m³) were compared. All mixes had a water-to-binder ratio of 0.45. The alkaline solutions used consist of sodium hydroxide and sodium silicate solutions with 5, 6, and 7% Na ions and a constant activator modulus (ratio of SiO₂/Na₂O) of one. The finding demonstrated that the workability of fresh self-compacting concrete with different binder content satisfied the EFNARC limitation. Mixes with 700 kg/m³ binder content had the highest compressive and tensile strength and modulus of elasticity. Generally, the peak temperature and heat production of cementitious mixes were 14% and 56% more than those of alkali-activated mixes, respectively.
Keywords
Self-Compacting Alkali Activated Concrete
Modulus of Elasticity
Thermal Behavior
Slag
Fly Ash
Subjects
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  • Receive Date 02 January 2024
  • Revise Date 09 April 2024
  • Accept Date 26 May 2024