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Title: Improved microstructure of cement-based composites through the addition of rock wool particles

Rock wool is an inorganic fibrous substance produced by steam blasting and cooling molten glass. As with other industrial by-products, rock wool particles can be used as cementitious materials or ultra fine fillers in cement-based composites. This study investigated the microstructure of mortar specimens produced with cement-based composites that include various forms of rock wool particles. It conducted compressive strength testing, rapid chloride penetration tests, X-ray diffraction analysis, thermo-gravimetric analysis, and scanning electronic microscopy to evaluate the macro- and micro-properties of the cement-based composites. Test results indicate that inclusion of rock wool particles in composites improved compressive strength and reduced chloride ion penetration at the age of 91 days due to the reduction of calcium hydroxide content. Microscopic analysis confirms that the use of rock wool particles contributed to the formation of a denser, more compact microstructure within the hardened paste. In addition, X-ray diffraction analysis shows few changes in formation of pozzolanic reaction products and no new hydrations are formed with incorporating rock wool particles. - Highlights: • We report the microstructural characterization of cement-based composites. • Different mixes produced with various rock wool particles have been tested. • The influence of different mixes on macro and micro propertiesmore » has been discussed. • The macro properties are included compressive strength and permeability. • XRD and SEM observations confirm the pozzolanic reaction in the resulting pastes.« less
Authors:
 [1] ;  [2] ;  [1] ; ;  [3]
  1. Dept. of Civil Engineering, National Ilan University, Ilan 26047, Taiwan (China)
  2. (China)
  3. Dept. of Harbor and River Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan (China)
Publication Date:
OSTI Identifier:
22288661
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 84; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM HYDROXIDES; CEMENTS; CHLORIDES; CHLORINE IONS; COMPRESSION STRENGTH; EXPLOSIVE FRACTURING; GRAVIMETRIC ANALYSIS; MICROSTRUCTURE; PARTICLES; ROCKS; SCANNING ELECTRON MICROSCOPY; X-RAY DIFFRACTION