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Durability Of Self-consolidating Concrete To Combined Effects Of Sulphate Attack And Frost Action

机译：自固结混凝土对硫酸盐侵蚀和霜冻作用共同作用的耐久性

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摘要

The worldwide shift towards performance-based standards for concrete demands the advent of performance tests that combine more than one damage mechanism. Such tests can be more reliable in evaluating emerging concrete types such as self-consolidating concrete (SCC). Several applications of SCC involve its exposure to both freezing-thawing cycles and chemical attack, particularly to sulphate-rich media. This study aims at investigating the durability of SCC to sulphate attack coupled with frost action. Potential performance risks of SCC under this dual exposure were identified in terms of various mixture design parameters. Deterioration in physico-mechanical parameters was related to thermal, minera-logical and microscopy analyses, which demonstrated the complex mutual effects of sulphate attack and frost action on SCC specimens. It is shown that SCC mixtures that perform well under the classical ASTM C 1012 test can fail under coupled exposure to freezing-thawing cycles and sulphate attack.
机译：全球正朝着基于性能的混凝土标准转变，要求性能测试的出现结合了不止一种损坏机制。这样的测试可以更可靠地评估新兴的混凝土类型，例如自密实混凝土（SCC）。 SCC的几种应用涉及其经受冻融循环和化学侵蚀，特别是富硫酸盐介质。这项研究旨在调查SCC对硫酸盐侵蚀和霜冻作用的耐久性。根据各种混合物设计参数，确定了这种双重接触下SCC的潜在性能风险。物理力学参数的下降与热学，矿物学和显微镜分析有关，这表明硫酸盐侵蚀和霜冻作用对SCC标本具有复杂的相互影响。结果表明，在经典的ASTM C 1012测试中表现良好的SCC混合物在冻融循环和硫酸盐侵蚀的双重作用下会失效。

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