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一、混凝土拉伸裂缝扩展在应力-应变曲线上的反映混凝土中的微裂缝和裂缝扩展在近五十年来一直受到关注,并进行了广泛的理论和试验研究。硬化的混凝土在承受荷载以前,内部已存在微裂缝(又称初始裂缝),这一事实已被大量研究资料所证实。Mindess和Diamond最近发表了在扫描电子显微镜上安装微型试验机,测得水泥砂浆裂缝开展过程的照片,开阔了用细观断裂力学研究混凝土抗裂性的视野。混凝土裂缝形式可以分为界面裂缝、基
1. Extension of concrete tensile cracks on the stress-strain curve The reflection of micro-fractures and crack propagation in concrete has been of concern for nearly 50 years, and extensive theoretical and experimental studies have been conducted. The fact that micro-cracks (also known as initial cracks) already existed in the interior of the hardened concrete before it was subjected to load has been confirmed by a large amount of research data. Mindess and Diamond recently published photographs of the installation of a micro-tester on a scanning electron microscope to measure crack development in cement mortars, broadening the field of view of the crack resistance of concrete with meso-fracturing mechanics. Concrete cracks can be divided into interface cracks, bases