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Main Title: An Investigation of the Mechanical and Physical Characteristics of Cement Paste Incorporating Different Air Entraining Agents using X-ray Micro-Computed Tomography
Author(s): Abd Elrahman, Mohamed
El Madawy, Mohamed E.
Chung, Sang-Yeop
Majer, Stanisław
Youssf, Osama
Sikora, Pawel
Type: Article
Language Code: en
Abstract: Improving the thermal insulation properties of cement-based materials is the key to reducing energy loss and consumption in buildings. Lightweight cement-based composites can be used efficiently for this purpose, as a structural material with load bearing ability or as a non-structural one for thermal insulation. In this research, lightweight cement pastes containing fly ash and cement were prepared and tested. In these mixes, three different techniques for producing air voids inside the cement paste were used through the incorporation of aluminum powder (AL), air entraining agent (AA), and hollow microspheres (AS). Several experiments were carried out in order to examine the structural and physical characteristics of the cement composites, including dry density, compressive strength, porosity and absorption. A Hot Disk device was used to evaluate the thermal conductivity of different cement composites. In addition, X-ray micro-computed tomography (micro-CT) was adopted to investigate the microstructure of the air-entrained cement pastes and the spatial distribution of the voids inside pastes without destroying the specimens. The experimental results obtained showed that AS specimens with admixture of hollow microspheres can improve the compressive strength of cement composites compared to other air entraining admixtures at the same density level. It was also confirmed that the incorporation of aluminum powder creates large voids, which have a negative effect on specimens’ strength and absorption.
Issue Date: 6-Jan-2020
Date Available: 29-Apr-2020
DDC Class: 621 Angewandte Physik
Subject(s): lightweight cement paste
air entraining agents
hollow microspheres
aluminum powder
thermal insulation
compressive strength
Sponsor/Funder: EC/H2020/841592/EU/Ultra-Lightweight Concrete for 3D printing technologies/Ultra-LightCon-3D
Journal Title: Crystals
Publisher: MDPI
Publisher Place: Basel
Volume: 10
Issue: 1
Article Number: 23
Publisher DOI: 10.3390/cryst10010023
EISSN: 2073-4352
Appears in Collections:FG Baustoffe und Bauchemie » Publications

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