Comparative analysis of biogenic and chemical sulfuric acid attack on hardened cement paste using laser ablation-ICP-MS
Comparative analysis of biogenic and chemical sulfuric acid attack on hardened cement paste using laser ablation-ICP-MS
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DOI：
10.1016/j.cemconres.2016.05.003
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发表时间：
2016-09-01
影响因子：
11.4
通讯作者：
Mueller, Elisabeth
中科院分区：
文献类型：
--
作者：
Huber, Bettina;Hilbig, Harald;Mueller, Elisabeth
本研究的目的是研究化学和微生物衍生的硫酸 (H2SO4) 腐蚀对代表混凝土粘合剂的硬化水泥浆体的相对作用。水泥石盘暴露于化学 H2SO4（pH 1.0 和 2.0）和生物 H2SO4（pH 1.5-2.1）。 28天后，通过常见的视觉物理参数和激光烧蚀-ICP-MS作为评估元素分布变化的新型评估工具来评估损伤程度。结果表明，损害程度与 pH 值有关。 pH 1.0 时 4 毫米厚的圆盘被完全腐蚀。对于暴露于 pH 2.0 的生物和化学 H2SO4 的圆盘，完整的核心保持不变，具有相似的腐蚀层厚度（1.8-2.0 毫米）和硫酸渗透深度（1.1-1.3 毫米）。由于腐蚀层中的元素分布相似，与施加生物或化学 H2SO4 无关，因此两种酸攻击之间没有明显差异。 (C) 2016 Elsevier Ltd. 保留所有权利。
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. (C) 2016 Elsevier Ltd. All rights reserved.