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本文采用紧凑拉伸试件测试砂浆断裂韧度ｋ（１ｃ），研究了影响ｋ（１ｃ）的有关因素。结果表明，水泥标号对ｋ（１ｃ）有一定的影响，而水泥品种，对ｋ（１ｃ）的影响不明显；水胶比对ｋ（１ｃ）呈某种线性关系，水胶比越大，ｋ（１ｃ）越小；等量外掺１０％粉煤灰、硅粉或矿渣粉会降低ｋ（１ｃ），降低幅度与掺合料品种有关；ｋ（１ｃ）随粉煤灰掺量的增加而降低，粉煤灰超量取代水泥可以做到不降低ｋ（１ｃ）；ｋ（１ｃ）随养护龄期的延长而显著增大；ｋ（１ｃ）与轴拉强度的关系比ｋ（１ｃ）与抗压强度的关系更密切；砂浆试件相对缝深ａ／ｈ会影响ｋ（１ｃ）值，若要得到材料的特征值ｋ（１ｃ）之常数，则其试件形式和尺寸的影响有待于深入研究。
In this paper, the fracture toughness k (1c) of the mortar was tested with a compact tensile test specimen, and the related factors affecting k (1c) were studied. The results show that the cement label has a certain influence on k(1c), while the cement type has no obvious effect on k(1c); the water-binder ratio has a certain linear relationship with k(1c), and the larger the water-binder ratio, k (1c) The smaller the amount of fly ash, silica fume or slag powder mixed with the same amount, the k(1c) will be reduced, and the decrease will be related to the type of admixture; k(1c) will increase with the addition of fly ash. Lowering, excessive replacement of cement with fly ash can be achieved without reducing k(1c); k(1c) increases significantly with prolonged curing time; the relationship between k(1c) and axial tensile strength is greater than k(1c). The relationship between compressive strength is more closely related; the relative depth of a mortar specimen relative to the depth of a/h affects the value of k(1c). If the characteristic value of the material k(1c) is constant, the effect of the specimen form and size needs to be In-depth study.