Impact behavior and microstructure of cement mortar incorporating waste carpet fibers after exposure to high temperatures

2018 ◽  
Vol 187 ◽  
pp. 222-236 ◽  
Author(s):  
Weihong Xuan ◽  
Xudong Chen ◽  
Guo Yang ◽  
Feng Dai ◽  
Yuzhi Chen
Keyword(s):  
High Temperatures ◽  
Cement Mortar ◽  
Impact Behavior ◽  
Carpet Fibers

Changes of Mechanical Properties of Lightweight Cement Mortar Mixed with Recycled Expanded Polystyrene and Subjected to High Temperatures

2014 ◽  
Vol 1051 ◽  
pp. 752-756 ◽  
Author(s):  
Rocío Sancho ◽  
Ángel Castillo ◽  
Ma Eugenia Maciá ◽  
Rosa Corral
Keyword(s):  
Mechanical Properties ◽  
High Temperatures ◽  
Mechanical Response ◽  
Cement Mortar ◽  
Construction Materials ◽  
Lightweight Aggregate ◽  
Expanded Polystyrene ◽  
Partial Replacement ◽  
Different Temperatures ◽  
Residual Product

The main aim of this paper is to evaluate the influence of the recycled expanded polystyrene as lightweight aggregate on the mechanical properties of lightweight cement mortar when subjected to high temperatures.Various tests have been carried out on different mixtures of mortar. The water/cement mix proportion has always been the same and only the nature of the aggregates has changed, with a partial replacement of the conventional aggregate by recycled ground EPS (EPS-G) with values ranging from 10% to 30%, achieving significant results in relation to exposure to high temperatures. In this research, the samples have been subjected to different temperatures of exposure, in order to analyze the influence of the lightweight recycled arid dosage in the mechanical properties of mortars.The results of this study show the ability of mechanical response at high temperatures with light mortars EPS-G. This study shows how this new mix can be used in different building types, optimizing construction materials and reducing mortars density while transforming a residual product into an active product.

scholarly journals FIRE PROTECTION OF STEEL ELEMENTS USING LIGHTWEIGHT HYBRID CEMENT MORTAR

2021 ◽  
Vol 30 ◽  
pp. 104-108
Author(s):  
Stanislav Šulc ◽  
Vít Šmilauer ◽  
Jakub Šejna ◽  
František Wald
Keyword(s):  
High Temperatures ◽  
Fire Resistance ◽  
Fire Protection ◽  
Material Properties ◽  
Cement Mortar ◽  
Positive Impact ◽  
Steel Structures ◽  
Cement Based Materials ◽  
Noticeable Reduction ◽  
Steel Surfaces

Material properties of steel structures are significantly reduced at high temperatures, so a fire protection has strong positive impact on the fire resistance of the structure. Fire resistance of steel elements can be increased using a layer of cement-based materials as a fire protection. Most of commonly used cement-based materials do not withstand high temperatures without noticeable reduction of mechanical properties. Hybrid cement showed some interesting properties in the way of resistance to high temperatures and adhesion to steel surfaces, thus its behavior during fire exposure should be investigated. One experimental analysis with numerical simulation is presented in this article. It examines thermal material properties of lightweight hybrid cement mortar with expanded perlite from a simple experiment with a lab gas burner.

In situ REM imaging of surface processes on ceramic bulk crystals from 300 to 1670 K in a conventional TEM

1991 ◽  
Vol 49 ◽  
pp. 660-661
Author(s):  
Z. L. Wang ◽  
J. Bentley
Keyword(s):  
High Temperatures ◽  
Image Resolution ◽  
Atomic Processes ◽  
Crystal Surfaces ◽  
Beam Radiation ◽  
Surface Areas ◽  
Transmission Electron ◽  
Reflection Electron Microscopy ◽  
Gas Reactions

Studying the behavior of surfaces at high temperatures is of great importance for understanding the properties of ceramics and associated surface-gas reactions. Atomic processes occurring on bulk crystal surfaces at high temperatures can be recorded by reflection electron microscopy (REM) in a conventional transmission electron microscope (TEM) with relatively high resolution, because REM is especially sensitive to atomic-height steps.Improved REM image resolution with a FEG: Cleaved surfaces of a-alumina (012) exhibit atomic flatness with steps of height about 5 Å, determined by reference to a screw (or near screw) dislocation with a presumed Burgers vector of b = (1/3)<012> (see Fig. 1). Steps of heights less than about 0.8 Å can be clearly resolved only with a field emission gun (FEG) (Fig. 2). The small steps are formed by the surface oscillating between the closely packed O and Al stacking layers. The bands of dark contrast (Fig. 2b) are the result of beam radiation damage to surface areas initially terminated with O ions.

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