Replacing a portion of cement clinker with limestone powder can reduce carbon dioxide emissions, but limestone powder with different mixing rations and particle sizes will exert varying impacts on freshly mixed cement-based materials. In this paper, the effects of different limestone powders on the sulfate attack resistance of cement-based material under the coupling of time-varying temperature and sulfate attack are systematically investigated. At the same time, a variety of modern analysis and testing techniques were used to characterize the composition of erosion products during the coupling process of temperature time-varying and sulfate attack. Additionally, a full-life reliability of cement-based materials with limestone powder was evaluated by Weibull distribution. And the results showed that limestone powder with smaller particle size could reduce its impact on the sulfate resistance of cement mortar. The erosion products of samples were mainly ettringite and gypsum in the early stage, and the ettringite gradually changed to thaumasite in the later stage. The Weibull distribution can accurately simulate the reliability change of the specimen in the whole process, which can provide reference for future practical application in engineering.

中文翻译：

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时变温度与硫酸盐侵蚀耦合作用下石灰石粉粒径对水泥基材料抗硫酸盐性能的影响


用石灰石粉代替一部分水泥熟料可以减少二氧化碳排放，但不同混合配比和粒径的石灰石粉会对新混合的水泥基材料产生不同的影响。本文系统研究了时变温度与硫酸盐侵蚀耦合下不同石灰石粉体对水泥基材料抗硫酸盐侵蚀性能的影响。同时，采用多种现代分析测试技术对温度时变和硫酸盐侵蚀耦合过程中侵蚀产物的组成进行了表征。此外，通过 Weibull 分布评估了含石灰石粉的水泥基材料的全寿命可靠性。结果表明，粒径较小的石灰石粉可以降低其对水泥砂浆抗硫酸盐性能的影响。样品的侵蚀产物前期以钙矾石和石膏为主，后期钙矾石逐渐转变为奇石。Weibull 分布能够准确模拟试件在整个过程中的可靠性变化，可为未来在工程中的实际应用提供参考。