Funct. Mater. 2023; 30 (4): 561-570.
Mechanical properties of ultra-high-performance concrete containing fiber and metakaolin and its predictive modeling study
1Yuanpei College, Shaoxing University, Shaoxing 312000, China
2 School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
This paper investigates the influence of metakaolin (MK) and different fiber compounds on the mechanical properties of ultra-high performance concrete (UHPC). The study examines the incorporation of MK in combination with steel fibers, glass fibers, polyvinyl alcohol fibers, polypropylene fibers, and continuous basalt fibers, each at a 2% volume fraction in UHPC. The results demonstrate that the addition of MK with steel fibers yields the most favorable mechanical properties, resulting in a remarkable 28% increase in compressive strength, a 14% increase in flexural strength, and a 17.2% increase in modulus of elasticity, compared to specimens without fibers but containing 10% MK. Conversely, the inclusion of other fiber types leads to varying degrees of reduction in the mechanical properties of UHPC. This reduction is attributed to the formation of a weak interface between the fibers and the matrix, as well as fiber agglomeration. The results highlight the importance of careful fiber selection and compatibility of fibers when combining with MK to achieve optimal enhancement in UHPC performance. Based on the experimental test data, a model for predicting the elasticity modulus of UHPC as a function of time and SCMs was proposed with good reliability.
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