含有酯胺外加剂的混凝土暴露于硫酸盐和硫酸溶液中的耐久性

S. Amey, J. Buffenbarger, J. Daczko, D. A. Johnson
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引用次数: 1

摘要

一项调查提出了评估影响的酯胺外加剂(EA)对混凝土耐久性暴露于硫酸盐和硫酸溶液传统上对混凝土有害。在干湿循环条件下,将棱镜暴露在MgSO4环境中336天。其他棱镜暴露在pH=1的H2SO4环境中100天。在硫酸盐暴露期间,混凝土试件的外观和长度随时间的变化进行了评估。在硫酸作用过程中,通过试验溶液的pH值变化对混凝土试件进行评价。酯胺外加剂被证明是有利于降低混凝土暴露在这两种环境的初始敏感性。这一好处也被观察到,以提高已经低渗透混凝土含有火山灰,如粉煤灰和硅灰的阻力。掺合料的反应产物排列在混凝土孔基体上,可以解释这种行为。提出了一种区分EA与其他降低渗透性材料(如火山灰)作用的机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Durability of Concrete Containing an Ester-Amine Admixture Exposed to Sulfate and Sulfuric Acid Solutions
An investigation is presented to evaluate the effect an ester-amine admixture (EA) has on the durability of concrete exposed to sulfate and sulfuric acid solutions traditionally detrimental to concrete. Prisms were exposed to a MgSO4 environment under cyclic wet/dry conditions for 336 days. Other prisms were exposed to a H2SO4 environment at pH=1 for 100 days. During the sulfate exposures, the concrete specimens were evaluated by appearance and length change over time. During the sulfuric acid exposures, the concrete specimens were evaluated by the pH changes of the test solution. The ester-amine admixture was shown to be beneficial in reducing the initial susceptibility of concrete exposed to both environments. This benefit was also observed to improve the resistance of already low permeability concrete containing pozzolans such as fly ash and silica fume. The behavior was explained by the admixture's reaction products which line the concrete pore matrix. A mechanism that differentiates the action of the EA from other permeability reducing materials (e.g., pozzolans) is proposed.
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