应用田口优化技术提高自密实碱活化混凝土的断裂特性和脆性

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-03-22 DOI:10.1016/j.tafmec.2025.104931

Imran Kuttagola, M.H. Prashanth

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引用次数: 0

摘要

碱活化混凝土已经成为一种很有前途的节能建筑材料，它提供了一种技术上可行且生态高效的替代方案，与全球可持续发展目标保持一致。本研究探讨了通过控制最大骨料粒径（dmax）和粉煤灰的变化来优化自密实碱活化混凝土（SAAC）的断裂性能。采用系统的方法结合田口试验设计（DOE）和方差分析来确定提高断裂性能和延性的最佳混合比例。采用基于P -δ曲线尾部截短的重量补偿断裂功法（WWFM）确定与尺寸无关的断裂能（GF），提高了SAAC在结构应用中的可靠性。此外，双参数断裂模型（TPFM）评估了临界应力强度因子（KsIc）和临界裂纹尖端张开位移（CTODc），而基于matlab的盒数维法（BCDM）评估了分形维数(D)。结果表明，当粉煤灰含量为0%，dmax为16 mm （GF为206.3 N/m， KsIc为1.91 MPa /m）时，具有更高的断裂性能，适用于需要最大断裂能和韧性的结构应用。该研究进一步定制了一种具有更高延性的混合料，其中粉煤灰含量为50%，dmax为16 mm (CTODc为0.032 mm， D为1.144)，为非结构应用提供了平衡的解决方案，在增强延性的同时提供了足够的强度。封闭式预测设计（CPD）模型能够在规定的最大断裂载荷下预测ft和KIc，为工程师提供了一个实用的工具，通过调整骨料尺寸和粘合剂比例来优化SAAC配方，以满足特定项目的需求。回归模型与实验和现有文献结果高度一致，证实了未来SAAC混合设计预测性能的可靠性。

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Application of Taguchi’s optimization techniques for enhancing the fracture characteristics and brittleness of self-compacting alkali-activated concrete

Alkali-activated concrete has emerged as a promising material for energy-efficient construction, offering a technically viable and eco-efficient alternative that aligns with global sustainability goals. This study explores optimizing fracture properties in self-compacting alkali-activated concrete (SAAC) through controlled variations in maximum aggregate size (d_max) and fly ash. A systematic approach incorporating Taguchi’s design of experiments (DOE) and ANOVA analysis was employed to identify optimal mix proportions that enhance fracture performance and ductility. The study employed the Weight-Compensated Work of Fracture Method (WWFM) based on curtailment of the tail of the P–δ curve to determine the size-independent fracture energy (G_F), enhancing the reliability of SAAC in structural applications. Additionally, the Two-Parameter Fracture Model (TPFM) evaluated the critical stress intensity factor (K^s_Ic) and critical crack tip opening displacement (CTOD_c), while the MATLAB-based Box-Counting Dimension Method (BCDM) assessed the fractal dimension (D). The findings revealed a higher fracture performance with 0 % fly ash and 16 mm d_max (G_F of 206.3 N/m and K^s_Ic of 1.91 MPa√m), suitable for structural applications requiring maximum fracture energy and toughness. The study further tailored a higher ductility mix with 50 % fly ash and 16 mm d_max (CTOD_c of 0.032 mm and D of 1.144) offering a balanced solution for non-structural applications, providing sufficient strength with enhanced ductility. The closed-form predictive design (CPD) model enables the prediction of f_t and K_Ic under a specified maximum fracture load, offering engineers a practical tool to optimize SAAC formulations by adjusting aggregate sizes and binder proportions for specific project needs. Regression models aligned strongly with experimental and existing literature results, affirming the reliability of predictive performance for future SAAC mix designs.

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.