Abstract It is critical to study the fracture behavior of alkali-activated slag columnar coral aggregate concrete (ASCCAC), especially under ocean environment. Furthermore, it is necessary to also consider the microstructure of the specimens and fictitious crack growth. Thus, this paper is mainly aimed at evaluating the effects of average grain size (G=6 mm, 7 mm, 8 mm) on the fracture properties of ASCCAC samples, using a normal distribution methodology and two proposed modified fracture models. The three-point-bending (3-p-b) test was performed on single edge notched specimens with two beam depths W ≈ 100 and 150mm, different notch-to-depth ratios a = 0.1 - 0.7 , and the same span/depths ratio S / W of 4. Results show that the average values of tensile strength f t , fracture toughness K IC and fracture energy G F can be determined from peak load P max measurements based on the boundary effect model (BEM) and the improved maximum fracture load model (MFLM) by incorporating the average grain size G. The experimental scatters were analyzed based on the normal distribution analysis and the peak load P max was reliably predicted with 95% reliability.

中文翻译：

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碱活化矿渣海水柱珊瑚骨料混凝土断裂参数正态分布分析

摘要 研究碱活化矿渣柱状珊瑚骨料混凝土（ASCCAC）的断裂行为至关重要，尤其是在海洋环境下。此外，还需要考虑试样的微观结构和假想的裂纹扩展。因此，本文主要旨在评估平均晶粒尺寸（G=6 mm、7 mm、8 mm）对 ASCCAC 样品断裂特性的影响，使用正态分布方法和两个提出的改进断裂模型。三点弯曲 (3-pb) 测试是在具有两个光束深度 W ≈ 100 和 150mm、不同缺口深度比 a = 0.1 - 0.7 和相同跨度/深度比 S 的单边缺口试样上进行的/W 为 4。 结果表明，拉伸强度 ft 的平均值，