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钙离子溶出行为对含矿物掺合料水泥基材料抗压强度及耐久性的影响

Effects of Leaching Behavior of Calcium Ions on Compression and Durability of Cement-Based Materials with Mineral Admixtures.

作者信息

Cheng An, Chao Sao-Jeng, Lin Wei-Ting

机构信息

Department of Civil Engineering, National Ilan University, 1 Shen-Lung Road, Ilan 260, Taiwan.

Institute of Nuclear Energy Research, Atomic Energy Council, Executive Yuan, Taoyuan 325, Taiwan.

出版信息

Materials (Basel). 2013 May 7;6(5):1851-1872. doi: 10.3390/ma6051851.

DOI:10.3390/ma6051851
PMID:28809247
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5452506/
Abstract

Leaching of calcium ions increases the porosity of cement-based materials, consequently resulting in a negative effect on durability since it provides an entry for aggressive harmful ions, causing reinforcing steel corrosion. This study investigates the effects of leaching behavior of calcium ions on the compression and durability of cement-based materials. Since the parameters influencing the leaching behavior of cement-based materials are unclear and diverse, this paper focuses on the influence of added mineral admixtures (fly ash, slag and silica fume) on the leaching behavior of calcium ions regarding compression and durability of cemented-based materials. Ammonium nitrate solution was used to accelerate the leaching process in this study. Scanning electron microscopy, X-ray diffraction analysis, and thermogravimetric analysis were employed to analyze and compare the cement-based material compositions prior to and after calcium ion leaching. The experimental results show that the mineral admixtures reduce calcium hydroxide quantity and refine pore structure through pozzolanic reaction, thus enhancing the compressive strength and durability of cement-based materials.

摘要

钙离子的浸出会增加水泥基材料的孔隙率，进而对耐久性产生负面影响，因为它为侵蚀性有害离子提供了进入通道，导致钢筋腐蚀。本研究调查了钙离子浸出行为对水泥基材料抗压强度和耐久性的影响。由于影响水泥基材料浸出行为的参数尚不明确且多种多样，本文重点研究了添加矿物掺合料（粉煤灰、矿渣和硅灰）对钙离子浸出行为的影响，涉及水泥基材料的抗压强度和耐久性。本研究使用硝酸铵溶液加速浸出过程。采用扫描电子显微镜、X射线衍射分析和热重分析来分析和比较钙离子浸出前后水泥基材料的成分。实验结果表明，矿物掺合料通过火山灰反应减少了氢氧化钙的量并细化了孔隙结构，从而提高了水泥基材料的抗压强度和耐久性。

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