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首页> 外文期刊>Engineering Review >THE FAILURE PROCESS OF MORTARS DURING SULFATE ATTACK
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THE FAILURE PROCESS OF MORTARS DURING SULFATE ATTACK

机译：硫酸盐攻击过程中迫击炮的失败过程

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External sulfate attacks on concrete structures may cause serious damage and it has attracted a wide range of attention from numerous researchers over the past decades. However, many studies have been concentrated on the sample which has been already destroyed. This paper investigated the entire deterioration process of mortars that were immersed in Na_2SO_4 solution containing 3 gSO_4~(2-)/L and 33.8g SO_4~(2-)/l at 20 °C up to 600 days. The study on time-varying regularity of expansion, cracks, compressive strength and mineral phases was investigated. Back scattered electron image was used to further examine the evolution of microstructures of the mortars during the attack process. The results showed that damage process of mortars can be described as induction stage, surface damage, bulk damage and then completely damage stage. Fine ettringites that were formed in restricted spaces, approximately 2-5 μm, result in surface damage. At the bulk damage stage, cracking was the main characteristic of mortar which leads to obvious expansion. In this stage, some large ettringite crystals (>20μm) were just
机译：外部硫酸盐对混凝土结构的攻击可能会造成严重损害，并且在过去几十年中吸引了来自众多研究人员的广泛关注。然而，许多研究已经集中在已经被摧毁的样品上。本文研究了浸入含有3GSO_4〜（2 - ）/ L和33.8g SO_4〜（2 - ）/ L的Na_2SO_4溶液中浸入的砂浆的整个劣化过程，高达600天。研究了膨胀，裂缝，抗压强度和矿物阶段时变规律的研究。后退散射电子图像用于进一步检查攻击过程中砂浆的微观结构的演变。结果表明，砂浆的损伤过程可谓诱导阶段，表面损坏，散装损伤，然后完全损坏阶段。在受限制空间中形成的精细eTtringites，约为2-5μm，导致表面损坏。在散装损伤阶段，裂缝是砂浆的主要特征，导致明显的扩张。在这个阶段，一些大型eTtringite晶体（>20μm）只是

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