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A comprehensive study of basalt fiber reinforced magnesium phosphate cement incorporating ultrafine fly ash
, Article Composites Part B: Engineering ; Volume 168 , 2019 , Pages 204-217 ; 13598368 (ISSN) ; Chen, B ; Yu, J ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
This study investigated the influence of ultrafine fly ash (FA) on the mechanical properties, elevated temperature resistance and water stability of basalt fiber reinforced magnesium phosphate cement, and synergy mechanism was examined with the help of X-ray diffraction (XRD), thermogravimetric analysis (TGA), mercury intrusion porosimeter (MIP) and scanning electron microscopy energy dispersive spectroscopy (SEM/SEM-EDS) analysis techniques. Experimental results showed that incorporation of FA improved the mechanical properties, temperature resistance and water stability of MPC composites. TGA results exhibited that the mass loss of MPC composites was gradually reduced by increasing the...
Experimental research on the performance of lightweight concrete containing foam and expanded clay aggregate
, Article Composites Part B: Engineering ; Volume 171 , 2019 , Pages 46-60 ; 13598368 (ISSN) ; Chen, B ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
This work addresses the preparation of self-flowing lightweight aggregate foamed concrete (LAFC) resulting from the mixing of stable foam, expanded clay aggregate (ECA) and silica fume (SF) as main raw materials. Formulated LAFC mixtures were tested for the mechanical, thermal, sorption and high-temperature resistance properties. Results showed that the increase in the volume of foam from 0% to 20% considerably improved the flowability of LAFC and LAFC mixtures were categorized into high stable visual stability index. Compressive strength of LAFC mixtures was reduced from 24.75 MPa to 21.10, 15.95 and 12.05 MPa respectively when foam volume was increased from 0% to 10, 15 and 20%. Thermal...
Evaluation of Mechanical Properties of Rammed Earth Exposed to High Temperature and Flame with Destructive and Non-Destructive Tests
, M.Sc. Thesis Sharif University of Technology ; Toufigh, Vahab (Supervisor)
Abstract
The environmental friendliness and sustainable development of rammed earth structures has attracted the attention of numerous researchers in recent years. Obviously, a better understanding of the structural and mechanical performance of rammed earth is the way to use rammed earth as a sustainable building material. Structural fire safety is one of the primary considerations in the design of structures. Several experiments and investigations had been conducted to investigate the behavior of materials at high temperatures. Base on author knowledge at present, few studies are available on thermomechanical properties of earthen construction materials at temperatures higher than 100°C and even...
Structural and electrical transport properties of hexagonal 4H BaRu 1-xMnxO3 perovskite
, Article Physica B: Condensed Matter ; Volume 406, Issue 18 , September , 2011 , Pages 3363-3366 ; 09214526 (ISSN) ; Fallahi, S ; Akhavan, M ; Sharif University of Technology
2011
Abstract
In this paper, structural and electrical transport properties of hexagonal, 4H-type, BaRu1-xMnxO3 (x=0-0.3), synthesized by the solid-state reaction method at ambient pressure, have been presented. Electrical transport properties are measured over a temperature range of 10300 K in the magnetic field up to 15 kOe. The low temperature resistivity (10K
Preparation of nanostructured high-temperature TZM alloy by mechanical alloying and sintering
, Article International Journal of Refractory Metals and Hard Materials ; Volume 29, Issue 1 , 2011 , Pages 141-145 ; 02634368 (ISSN) ; Malekzadeh, M ; Sadrnezhaad, S. K ; Sharif University of Technology
Abstract
Mechanical milling proceeded by sintering was used to synthesize nanostructured temperature-resistant TZM alloy. Milling under Ar for different times (1, 2, 3, 5, 10, 15, 20, 25, and 30 h) and sintering at 1500, 1600 and 1700 °C for 30, 45, 60 and 90 min resulted in increasing of low-energy grain boundaries (LEGBs) and dispersion of TiC and ZrC with a size of ~ 65 nm in the matrix near LEGBs. Morphology and grain size of the products were determined from scanning electron microscope (SEM) images and X-ray diffraction (XRD) patterns, almost precisely. Optimum density of nanostructured TZM alloy ~ 9.95 ± 0.01 g/cm 3 was achieved by sintering at 1700 °C for 90 min
Applications of highly salt and highly temperature resistance terpolymer of acrylamide/styrene/maleic anhydride monomers as a rheological modifier: Rheological and corrosion protection properties studies
, Article Journal of Molecular Liquids ; Volume 294 , 2019 ; 01677322 (ISSN) ; Ramezani Saadat Abadi, A ; Haddadi, A ; Sharif University of Technology
Elsevier B.V
2019
Abstract
Due to the weak performance of commercially affordable natural and synthetic polymeric thickeners in high temperatures and salinity, they fail to use in many applications especially in saline conditions with high temperatures. In this work, a new salt and temperature resistance acrylamide/styrene/maleic anhydride terpolymer (PASM-t) with self-associative properties was synthesized via a one-step inverse emulsion polymerization and its applicability as a rheological modifier and thickener was investigated. The characteristics of synthesized PASM-t (s-PASM-t) and its aqueous solutions were investigated using FT-IR, FE-SEM, GPC and rheometric mechanical spectrometry (RMS) analyses. The...
Static and dynamic evaluation of the effect of nanomaterials on the performance of a novel synthesized PPG for water shut-off and improved oil recovery in fractured reservoirs
, Article Journal of Petroleum Science and Engineering ; Volume 189 , June , 2020 ; Fatemi, M ; Ghazanfari, M. H ; Sharif University of Technology
Elsevier B. V
2020
Abstract
Among different methods which are introduced to reduce unwanted water production, “Preformed Particle Gel” (PPG) is a recently developed type of these gels that can have important advantages such as temperature resistance and long-term stability. The aim of the present work is to synthesize a new type of PPG in which the above specifications are improved even further with the advantage of the Nano-material (here after called N-PPG) and then investigate its effectiveness via static bulk tests as well as dynamic Hele-Shaw and Micromodel tests. In static tube tests, the swelling performance of N-PPG samples was evaluated under different conditions. The examined parameters include various pH of...