Many studies on the mixture design of fly ash and slag ternary blended concrete have been conducted. However, these previous studies did not consider the effects of climate change, such as acceleration in the deterioration of durability, on mixture design. This study presents a procedure for the optimal mixture design of ternary blended concrete considering climate change and durability. First, the costs of CO₂ emissions and material are calculated based on the concrete mixture and unit prices. Total cost is equal to the sum of material cost and CO₂ emissions cost, and is set as the objective function of the optimization. Second, strength, slump, carbonation, and chloride ingress models are used to evaluate concrete properties. The effect of different climate change scenarios on carbonation and chloride ingress is considered. A genetic algorithm is used to find the optimal mixture considering various constraints. Third, illustrative examples are shown for mixture design of ternary blended concrete. The analysis results show that for ternary blended concrete exposed to an atmospheric environment, a rich mix is necessary to meet the challenge of climate change, and for ternary blended concrete exposed to a marine environment, the impact of climate change on mixture design is marginal.

中文翻译：

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考虑碳化和氯化物侵入的气候变化对混合混凝土最佳配合比设计的影响

粉煤灰和矿渣三元混合混凝土的混合料设计已经进行了许多研究。但是，这些先前的研究没有考虑气候变化对混合物设计的影响，例如耐久性恶化的加速。这项研究提出了一种考虑气候变化和耐久性的三元混合混凝土最佳混合料设计方法。首先，根据混凝土混合物和单价计算CO ₂排放和材料的成本。总成本等于材料成本和CO ₂的总和排放成本，并设置为优化的目标函数。其次，强度，坍落度，碳化和氯化物进入模型用于评估混凝土性能。考虑了不同气候变化情景对碳酸化和氯化物进入的影响。考虑各种约束条件，使用遗传算法找到最佳混合物。第三，示出了用于三元混合混凝土的混合设计的说明性示例。分析结果表明，对于暴露在大气环境中的三元混合混凝土，需要丰富的混合料来应对气候变化的挑战；对于暴露在海洋环境中的三元混合混凝土，气候变化对混合料设计的影响很小。