纤维增强水泥基复合材料的流动性与流变性研究进展

doi:10.11896/cldb.201905014

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Abstract Fibers reinforced cementitious composites are widely used in roads, bridges and other construction projects because they have excellent har-dened state properties, including stretching, bending and durability. Nevertheless, cementitious materials can hardly be well formed in the mixing state with the presence of fibers, which would deteriorate the properties of their hardened state. For the sake of optimizing the performance of mixtures, more and more efforts have been paid into the research on the flowability and rheological properties. Traditional flowability test is capable of determining whether the mixtures meet the molding requirements in a short period of time, but it suffers from manual errors and limited test range. The rheological test can reflect the interaction among the components of the mixtures under shear stress, yet it is difficult to be applied in practical projects. There are pros and cons in both test, but they can complement each other. Consequently, it is an inevitable trend to establish the relationship between the flowability and rheological properties of cement-based materials.
Aiming at analyzing the relationship between flowability and rheological properties, it is necessary to figure out the mechanism of them. In the experimental design, common approaches adopted by researchers include adjusting the composition of the material, regulating the proportion of components or changing the fiber parameters. The optimal ratio with better fresh performance and hardening performance can be acquired by comparing the flowability and rheological parameters of the mixtures under various factors and observing the microstructure of the hardened materials. In addition, the variation of flowability and rheological parameters can be found out in this process, and the relationship between them can be further obtained by mathematical fitting or analysis model. As a results, the initial flowability-rheology equation of cement-based materials emerge.
Unfortunately, the applicability of this traditional analytical method is questioned under diverse additives, materials, analysis models and so forth. The physical meaning and applicability of the relationship are ambiguous. As high performance fiber reinforced cement-based materials are increasingly popular and become the research focus, their design requirements of low water-to-binder ratio will inevitably lead to the use of superplasticizer in large amount. At the same time, the mixing of various mineral admixtures will also change the internal structure of the matrix, making the analysis environment get much more complicated. In addition, the establishment of the relationship rests on the rheological models, and the rheological models corresponding to various fiber cement materials may quite different. These factors make the traditional flow-rheological relationship no longer appropriate to describe the new cement-based materials with fibers. In order to reduce the impact of the factors change on the relationship, it is advisable to analyze the material based on its own properties. The relationship established by taking the inherent properties of the material as parameters and using the test data only for verification will not affected by test conditions and exhibits wider applicability and higher reliability.
Based on the research progress on fresh FRCC mixtures performance, the effect on the fresh properties of different fiber factors and matrix factors in cement-based materials is analyzed, the relationship between the workability and rheological properties is discussed, and the deficiency of the research on the performance of FRCC mixture at present is pointed out, for the sake of providing the reference for the research of workability and rheological properties on the new FRCC, represented by multi-scale hybrid fiber reinforced cementitious composites (HyFRCC).

Key words： fiber flowability rheological properties fiber/matrix factors

Published: 12 March 2019

CLC number:

TB332

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	SI Wen
	CAO Mingli
	FENG Jiaqi

Cite this article:

SI Wen,CAO Mingli,FENG Jiaqi. Advances in Research on Flowability and Rheological Properties of Fiber Reinforced Cementitious Composites[J]. Materials Reports, 2019, 33(5): 819-825.

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http://www.mater-rep.com/EN/10.11896/cldb.201905014 OR http://www.mater-rep.com/EN/Y2019/V33/I5/819

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