混凝土拌合物初始温度对含纤维新拌超高性能混凝土流变性能和离析的影响

Q4 Physics and Astronomy

Defect and Diffusion Forum Pub Date : 2024-03-25 DOI:10.4028/p-j1wmcb

Tomáš Bittner, Karel Hurtig, D. Jiroutová

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引用次数: 0

摘要

在 GAČR 21-24070S 项目框架内，根据新拌高强混凝土的流变特性建立了纤维离析模型，验证了新拌混凝土的流变特性和纤维离析随温度变化而变化的情况。在三种温度条件下（5 °C左右的极低温度、20 °C左右的正常温度和 30 °C以上的高温）验证了流变特性和纤维离析。对带有纤维的超高性能混凝土在不同温度条件下的特性进行了比较，主要是在新鲜混合物上进行溢出试验。随后，在所有情况下都对硬化试验体（即 40/40/160 梁）进行了拉伸弯曲和压缩验证。单个样品内的实际纤维偏析也通过显微镜分析进行了验证。通过加热或冷却输入的原材料，模拟了不同的温度条件。根据流变特性和机械参数的变化程度对结果进行了比较。

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Rheological Properties and Segregation of Fresh UHPC with Fibers Affected by Initial Temperature of Concrete Mix

Within the framework of the project GAČR 21-24070S Model of fibre segregation in dependence on rheological properties of fresh HPC, the rheological properties and fibre segregation in fresh concrete mix depending on temperature changes have been verified. The rheological properties and fibre segregation have been verified under three temperature conditions (very low temperatures around 5 °C, normal temperature conditions around 20 °C and high temperatures above 30 °C). Comparison of the properties of UHPC with fibres at different temperature conditions has been performed on fresh mixtures mainly by spill tests. Subsequently, hardened test bodies, i.e. 40/40/160 beams, were verified in tensile bending and compression in all cases. The actual fibre segregation within the individual samples has also been verified by microscopic analysis. Different temperature conditions have been simulated by heating or cooling the input raw materials. The results have been compared by degree of changes in rheological properties and mechanical parameters.

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来源期刊

Defect and Diffusion Forum Physics and Astronomy-Radiation

CiteScore

1.20

自引率

0.00%

发文量

127

期刊介绍： Defect and Diffusion Forum (formerly Part A of ''''Diffusion and Defect Data'''') is designed for publication of up-to-date scientific research and applied aspects in the area of formation and dissemination of defects in solid materials, including the phenomena of diffusion. In addition to the traditional topic of mass diffusion, the journal is open to papers from the area of heat transfer in solids, liquids and gases, materials and substances. All papers are peer-reviewed and edited. Members of Editorial Boards and Associate Editors are invited to submit papers for publication in “Defect and Diffusion Forum” . Authors retain the right to publish an extended and significantly updated version in another periodical.