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Corrosion investigation of fly ash based geopolymer mortar in natural sewer environment and sulphuric acid solution

机译：自然下水道环境和硫酸溶液中粉煤灰基质砂浆的腐蚀研究

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摘要

The objective of this research is to estimate the durability of low-calcium fly ash based geopolymer mortar (FA-GPm) in comparison with sulphate resistant Portland cement mortars (SRPCm) exposed to natural sewer environment. Their performance is also investigated in the sulphuric acid (H2SO4) solution to highlight the difference in the corrosion mechanisms between these two exposure conditions. Mortar samples were removed from natural sewer and 1.5 % sulphuric acid solution after 12, 24 months and 6 months of exposure, respectively. Visual and physical analyses showed greater neutralization and loss in alkalinity in FA-GPm compared to SRPCm. However, mass loss and strength reduction observed for SRPCm was greater compared to FA-GPm. Microstructural analysis showed widespread gypsum crystallization within SRPCm matrix compared to FA-GPm, leading to more severe matrix deterioration. Differences in corrosion mechanism were identified between natural and sulphuric acid exposure conditions which led to the variation in estimated corrosion depth. Data collected from these microstructural and physical investigations were utilized to develop simplified linear models to express the depth of corrosion, surface pH, mass loss and neutralization depth of FA-GPm and SRPCm as a dependent of exposure time, temperature and H2S concentration in natural sewer environments.
机译：该研究的目的是估计与硫酸盐抗性的波特兰水泥迫击炮（SRPCM）暴露于自然下水道环境的耐药性耐磷酸盐基基砂浆（FA-GPM）的耐久性。还在硫酸（H 2 SO 4）溶液中研究了它们的性能，以突出这两个暴露条件之间的腐蚀机制的差异。在12,24个月和6个月的暴露后，从天然下水道和1.5％硫酸溶液中除去砂浆样品。与SRPCM相比，视觉和物理分析表明FA-GPM中碱度的中和和碱度损失。然而，与FA-GPM相比，对SRPCM的质量损失和强度减少更大。与FA-GPM相比，微结构分析显示SRPCM基质内的广泛石膏结晶，导致更严重的基质劣化。在天然和硫酸暴露条件下鉴定了腐蚀机制的差异，这导致了估计腐蚀深度的变化。从这些微观结构和物理研究中收集的数据用于开发简化的线性模型，以表达FA-GPM和SRPCM的腐蚀，表面pH，质量损失和中和深度，作为自然下水道中的暴露时间，温度和H2S浓度的依赖性环境。

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