Comparative analysis of biogenic and chemical sulfuric acid attack on hardened cement paste using laser ablation-ICP-MS

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• 作者：Bettina Huber^a ; Harald Hilbig^b ; Mariana M. Mago^b ; Jö ; rg E. Drewes^a ; ^{jdrewes@tum.de" class="auth_mail" title="E-mail the corresponding author} ; Elisabeth Mü ; ller^a
• 关键词：Acidithiobacillus ; Concrete ; Corrosion ; Degradation ; Laser ablation mass spectrometry
• 刊名：Cement and Concrete Research
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：87
• 期：Complete
• 页码：14-21
• 全文大小：883 K

文摘

The aim of this study was to investigate the relative role of chemically and microbially derived sulfuric acid (H₂SO₄) corrosion on hardened cement paste representing a concrete binder. Cement stone disks were exposed to chemical H₂SO₄ (pH 1.0 and 2.0) and biological H₂SO₄ (pH 1.5–2.1). After 28 days, the degree of damage was evaluated by common visual-physical parameters and laser ablation-ICP-MS as a novel evaluation tool to assess changes in elemental distributions. The results revealed a pH-dependent degree of damage. The 4 mm thick disk at pH 1.0 was completely corroded. For the disks exposed to biogenic and chemical H₂SO₄ at pH 2.0 an intact core remained with a similar thickness of the corrosion layer (1.8–2.0 mm) and sulfuric acid penetration depth (1.1–1.3 mm). Since the elemental distribution was similar in the corroded layer independent of applying biological or chemical H₂SO₄, no obvious differences between the two acid attacks were revealed.