Mohammad Mastali
University of Minho
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Featured researches published by Mohammad Mastali.
Archive | 2018
Mohammad Mastali; Zahra Abdollahnejad; F. Pacheco-Torgal
The authors would like to acknowledge the financial support of the Foundation for Science and Technology (FCT) in the frame of project IF/00706/2014-UM.2.15.
Archive | 2018
Mohammad Mastali; Zahra Abdollahnejad; F. Pacheco-Torgal
The authors would like to acknowledge the financial support of the Foundation for Science and Technology (FCT) in the frame of project IF/00706/2014-UM.2.15.
Archive | 2018
Mohammad Mastali; Zahra Abdollahnejad; F. Pacheco-Torgal
The authors would like to acknowledge the financial support of the Foundation for Science and Technology (FCT) in the frame of project IF/00706/2014-UM.2.15.
Archive | 2018
Zahra Abdollahnejad; Zuhua Zhang; Hao Wang; Mohammad Mastali
A recent innovation, geopolymer foam concrete (GFC), combines the advantages of geopolymer technology and foam concrete, and provides the opportunity to reduce the environmental footprint of construction materials in terms of raw materials, embodied CO2 and operational energy in service. Foam concrete is generally defined as a type of lightweight concrete that consists of a cementitious binder with a high degree of void space, with or without the addition of fine aggregate. One of the main drawbacks of these materials is high drying shrinkage. This paper presents an extensive experimental study to reduce the drying shrinkage in foam geopolymer concrete. Moreover, mechanical properties of foam geopolymer concrete were characterized by compressive and flexural strengths. To reduce the drying shrinkage in foam geopolymer concretes different strategies used, including foam content (0.2%, 0.5%, 0.8%), sand/binder content (0.30, 0.35, 0.40, 0.45, 0.50, 0.75, 1.00, 1.25, 1.50), and using polypropylene (PP) fibers with different lengths (6 mm and 20 mm) and fiber volume fractions (0.2%, 0.6%, 1%, and 1.4%). The obtained results showed that increasing sand content up to 50% reduced the drying shrinkage, while the drying shrinkage increased above this sand content. Additionally, increasing foam content intensified the increase of drying shrinkage. This increase was proportional to foam content. In general, regardless of fiber type and content, reinforcement of foam geopolymer concrete reduced the drying shrinkage and enhanced mechanical properties.
Journal of Sandwich Structures and Materials | 2017
Mohammad Mastali; Joaquim A. O. Barros; Isabel Valente
In a hybrid panel with glass fiber-reinforced polymer (GFRP) bottom skin and ribs, and deflection hardening cementitious composites (DHCC) top layer, it is very important to provide good shear connection between these various components in order to increase the load carrying capacity of the resulting hybrid slabs and a larger increment of deflection before the occurrence of the structural softening of this panel. The effectiveness of the proposed hybrid sandwich panels strongly depends on the performance of the shear connectors. The efficiency of indented shear connectors in improving the flexural performance of hybrid sandwich panels is here demonstrated. Since the efficiency of indented shear connectors in the hybrid sandwich panels is unknown, efforts are made in this paper in investigating the shear performance of hybrid slabs. A special focus is given on the indented shear connector’s behavior, considering different shear span ratios in ranges of 2.00, 1.39, and 0.77. In this regard, six hybrid sandwich panels were manufactured and experimentally tested under different shear loads. Then, the results are interpreted comprehensively. The results obtained show that the GFRP rib thickness and height, and shear span ratios influence the damage events and the structural performance of the hybrid sandwich panels. Moreover, it was observed that using indented shear connectors in the hybrid slabs, regardless of the shear span ratios, provides high load capacity, high stiffness, and large residual deflection.
Composite Structures | 2015
Mohammad Mastali; Isabel Valente; Joaquim A. O. Barros; Delfina Gonçalves
8th RILEM International Symposium on Fibre Reinforced Concrete: challenges and opportunities | 2012
Esmaeel Esmaeeli; Joaquim A. O. Barros; Mohammad Mastali
Composite Structures | 2016
Mohammad Mastali; Isabel Valente; Joaquim A. O. Barros
Composites Part B-engineering | 2017
Mohammad Kheradmand; Mohammad Mastali; Zahra Abdollahnejad; F. Pacheco-Torgal
Composite Structures | 2017
Joaquim A. O. Barros; Mohammadali Rezazadeh; João Pedro Santos Laranjeira; Mohammad R.M. Hosseini; Mohammad Mastali; Honeyeh Ramezansefat