Ali Katebi

Bio: Ali Katebi is an academic researcher from Kharazmi University. The author has contributed to research in topics: Absorption of water & Properties of concrete. The author has an hindex of 5, co-authored 9 publications receiving 65 citations.

Environmental life cycle assessment of concrete with different mixed designs

Abstract: To identify proper types of concrete with favourable mechanical and durability properties is necessary, which imposes minimum pollution into the environment. We collected information, based on the ...

Acceptance model of precast concrete components in building construction based on Technology Acceptance Model (TAM) and Technology, Organization, and Environment (TOE) framework

Abstract: According to the increasing development of prefabrication as a sustainable alternative approach to conventional construction methods, the use of Precast Concrete Components (PCC) has received more attention. This method provides advantages such as improved construction speed, labor productivity, and lower waste of resources. It has also been suggested as an immediate response to the social need of housing demand. However, in some countries, most concrete buildings are still built using traditional methods. Considering the importance of promoting the use of PCC in building construction, this study aims to develop a model based on the Technology Acceptance Model (TAM) and the Technology, Organization, and Environment (TOE) framework to quantitatively investigate the influencing factors on adopting PCC from both individual and organizational perspectives. The proposed model was analyzed with the Partial Least Squares Structural Equation Modeling (PLS-SEM) method. The results showed improving engineers' understanding of PCC's advantages, strengthening the competitive atmosphere between organizations besides government support for builders to use PCC, had the greatest role in adopting this approach. In addition, the indirect effects of perceived risks and costs on PCC adoption through engineers' understanding of the benefits of this method were significant. The moderation effect of civil engineers' experience was also investigated on the relationship between influencing factors and intention to adopt PCC. The findings of this study may help economic and educational policymakers to develop prefabrication using PCC. New insights have also been presented by the current study to conduct more quantitative and qualitative research in the prefabrication context.

Assessment of self-healing and durability parameters of concretes incorporating crystalline admixtures and Portland Limestone Cement

Abstract: The repair of concrete structures damaged by water or water borne chemicals is estimated to cost billions of dollars annually worldwide. However, the solutions that can make concrete structures more sustainable and durable, are limited. The use of crystalline admixtures (CA) has a potential of improving the durability and reducing permeability of concrete structures especially those exposed to corrosive environments. This paper presents various investigations on the influence of crystalline admixtures on the strength, self-healing, and durability characteristics of concretes with two different cement types (Ordinary Portland Cement [OPC] and Portland Limestone Cement [PLC]). Test methods include the rapid chloride permeability (RCP), surface/bulk electrical resistivity and water permeability tests, self-healing test, compressive strength test and salt ponding test. The results indicate that the water permeability coefficient decreased by 3 times whereas the self-healing ratio increased by a higher rate by adding crystalline admixtures into the concrete mix. This paper presents empirical equations to correlate resistivity, total charge passed, or water permeability with each other. Further, the correlation between the surface and bulk resistivity is strong and the evidence from self-healing test suggests faster sealing of crack widths up to 250 μm for CA treated specimens.