Study Of The Microstructure And Pores
Distribution Of Lightweight Mortar Containing
Polymer Waste Aggregates
Author(s)
V. Calderón, S. Gutiérrez-González, A. Rodriguez
& M. Horgnies
Abstract
The study of mortars containing polymer wastes is a key-topic to create new
construction materials for a sustainable development. This work deals with the
characterization of the microstructure of lightweight mortars containing polymer
waste powder, which are recycled, such as aggregates. The observations of crosssections
and fractured samples using Scanning Electron Microscopy (SEM)
highlight that the particles of polymer are homogeneously dispersed into the
mortar matrix. Numerous capillarity pores are detected into the hydrated cement
paste. Calcium Silicate Hydrates covering the particles of polymer are also
detected in environmental mode. The porosity is analyzed using two
complementary techniques: (i) Mercury Intrusion Porosimetry (MIP) revealing
the micro-pores sized from 170–200 μm up until 5–10 nm; and (ii) X-ray
computerized axial tomography providing the macro-pores sized larger than
170 μm. The distribution of the total intruded volume is quantified by MIP
according to the ratio sand/particles of polymer. The distortion of the pores
distribution increases as a function of the content of polymer residues, excepted
when the particles of polymer are replacing 25% of sand. In this specific case,
the measurements by MIP and tomography show a homogeneous distribution of
the larger pores, close to the one of the reference mortar.
Keywords: lightweight mortar, waste polymer, microstructure, tomography,
MIP, SEM.
Keywords
lightweight mortar, waste polymer, microstructure, tomography,
MIP, SEM
Related Book
Other papers in this volume
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