Foaming toreducethedensityofgeopolymericmaterialsisincreasinglybeingreportedintheliteratureasithasbeenshowntobeeffectivein improving theirinsulatingproperties.However,thereisnoconsistencyinfoamingmethodsandassuchthisstudywasperformedtocompare methods inordertobetterunderstandtheireffectonthepropertiesofgeopolymers.Asurfactantandtwochemicalfoamingagents(hydrogen peroxide andaluminiumpowder)wereaddedtoa fly ashbasedgeopolymermatrix.Surfactantwasalsocombinedwitheachofthechemical foaming agentsinordertostabilisethefoaminthegeopolymermatrixandtoreducecoarsepores.Thephysical,mechanicalandmicrostructural properties ofthelowdensitygeopolymersarepresentedandtheeffectsofthefoamingagents'characteristicsonthehardenedproductis discussed, aswellastherelativemeritsofthedifferentprocedurestosynthesisethefoamedgeopolymer.Itwasfoundthathomogeneous microstructures withsmallporescanbeobtainedbyaddingsurfactantandhydrogenperoxide.Thecombinationofhydrogenperoxide(0.1wt%) and surfactant(1.0wt%)producedgeopolymerfoamswithdensityandcompressivestrengthvaluesof0.94g/cm3 and 4.6MPa,respectively.
A comparison between different foaming methods for the synthesis of light weight geopolymers
MASI, GIULIA;BIGNOZZI, MARIA;
2014
Abstract
Foaming toreducethedensityofgeopolymericmaterialsisincreasinglybeingreportedintheliteratureasithasbeenshowntobeeffectivein improving theirinsulatingproperties.However,thereisnoconsistencyinfoamingmethodsandassuchthisstudywasperformedtocompare methods inordertobetterunderstandtheireffectonthepropertiesofgeopolymers.Asurfactantandtwochemicalfoamingagents(hydrogen peroxide andaluminiumpowder)wereaddedtoa fly ashbasedgeopolymermatrix.Surfactantwasalsocombinedwitheachofthechemical foaming agentsinordertostabilisethefoaminthegeopolymermatrixandtoreducecoarsepores.Thephysical,mechanicalandmicrostructural properties ofthelowdensitygeopolymersarepresentedandtheeffectsofthefoamingagents'characteristicsonthehardenedproductis discussed, aswellastherelativemeritsofthedifferentprocedurestosynthesisethefoamedgeopolymer.Itwasfoundthathomogeneous microstructures withsmallporescanbeobtainedbyaddingsurfactantandhydrogenperoxide.Thecombinationofhydrogenperoxide(0.1wt%) and surfactant(1.0wt%)producedgeopolymerfoamswithdensityandcompressivestrengthvaluesof0.94g/cm3 and 4.6MPa,respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
