Abstract: The higher the concrete strength grade, the greater the brittleness, and such problems are more prominent in lightweight aggregate concrete. Using steel fiber, carbon fiber, polypropylene fiber, etc. to increase the toughness of concrete, although it can achieve certain effects, but has a significant impact on project cost and environment. Based on the wide range of plant fiber sources and environmental friendliness, taking fly ash ceramsite concrete as an example, the influence of straw fiber amount, shape, length and amount of fly ash on the mechanical properties of fly ash ceramsite concrete was explored. Based on the interface transition zone theory, the effect of straw fiber on enhancing toughness was analyzed from the perspective of concrete tensile and compression ratio and impact strength. The results showed that the tensile-compression ratio increases with the increase of straw fiber content, and decreases with the increase of fiber length and fly ash content, the tensile-compression ratio decreases after the fiber modification, but higher than the fiber-free group, the effect of straw fiber on increasing the tensile-compression ratio is similar to that of other fibers, and the effect of improving the impact strength of concrete after modification is remarkable. Based on regression analysis, a prediction model for splitting tensile strength of fiber lightweight aggregate concrete was proposed. The verification results showed that the relative error between the predicted value of the model and the experimental value of the literature was within 7%, the higher the concrete strength level, the more accurate the prediction result, it can be used to predict the tensile strength of fiber concrete and high performance concrete.
张学元, 吕春, 张道明, 王丽, 李扬. 稻草纤维在轻骨料混凝土中的增韧性能及劈裂抗拉强度预测模型[J]. 材料导报, 2020, 34(2): 2034-2038.
ZHANG Xueyuan, LYU Chun, ZHANG Daoming, WANG Li, LI Yang. Performance of Increasing Toughness of Straw Fiber in Lightweight Aggregate Concrete and Its Prediction Model of Splitting Tensile Strength. Materials Reports, 2020, 34(2): 2034-2038.
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2020, Vol. 34 
