Durability of Geopolymers under Different Erosion Environments

Abstract

Abstract: Geopolymer is a kind of new green cementitious material with network structures and amorphous phase, which has the characteristics of mineral and polymer materials. Fly ash and metakaolin were respectively used as raw materials to prepare geopolymer through alkali excitation. The durability of geopolymers (curing 28 d) under 5%HCl, 10%NaOH, 5%MgCl₂+5%NaCl, and 5%H₂SO₄ (all were mass fraction) erosion environment for 1 d to 84 d were researched. The results of X-ray diffraction (XRD), scanning electron microscopy (SEM), mass change and compressive strength reveal that geopolymers show different responses under different erosion environments. Fly ash based geopolymer exhibits excellent durability in low concentration of H₂SO₄, NaOH and salt solution, shows stability in microstructure, appearance, mass and compressive strength. Metakaolin based geopolymer has stable structure and property in salt solution. But under HCl erosion environment, the loss of mass and compressive strength for two geopolymers are significant, indicating obvious corrosion. The durability of fly ash based geopolymer in low concentration acid and base solution is more excellent than that of metakaolin based geopolymer. The potential application of these geopolymers is marine construction.

Key words: fly ash based geopolymer, metakaolin based geopolymer, erosion environment, immersion, durability

CLC Number:

TU52

QIU Xiumei, LIU Yadong, YAN Chunjie. Durability of Geopolymers under Different Erosion Environments[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 548-556.

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